Merge pull request #213 from ttt246/feature/ui_part2_191

.gitignore

@@ -2,4 +2,4 @@
 /.idea
 Brain/firebase_cred.json
 Brain/logs/*
-
+**/.DS_Store

Android/app/src/main/AndroidManifest.xml

@@ -39,18 +39,20 @@
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity
-            android:name=".ui.setting.view.SettingActivity"
-            android:exported="false" />
-        <activity
-            android:name=".ui.chat.view.ChatActivity"
-            android:exported="true"
-            android:windowSoftInputMode="adjustResize">
+            android:name=".ui.splash.SplashActivity"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".ui.setting.view.SettingActivity"
+            android:exported="false" />
+        <activity
+            android:name=".ui.chat.view.ChatActivity"
+            android:exported="false" />
 
         <receiver
             android:name=".utils.helpers.chat.AlarmReceiver"

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/local/dao/ContactDao.kt

@@ -1,6 +1,5 @@
 package com.matthaigh27.chatgptwrapper.data.local.dao
 
-import androidx.lifecycle.MutableLiveData
 import androidx.room.*
 import com.matthaigh27.chatgptwrapper.data.local.entity.ContactEntity
 

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/local/dao/ImageDao.kt

@@ -1,6 +1,5 @@
 package com.matthaigh27.chatgptwrapper.data.local.dao
 
-import androidx.lifecycle.MutableLiveData
 import androidx.room.*
 import com.matthaigh27.chatgptwrapper.data.local.entity.ImageEntity
 

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/local/entity/ContactEntity.kt

@@ -4,7 +4,7 @@ import androidx.room.Entity
 import androidx.room.PrimaryKey
 
 @Entity(tableName = "contacts")
-data class ContactEntity (
+data class ContactEntity(
     @PrimaryKey(autoGenerate = false) val id: String,
     val name: String,
     val phoneNumber: String,

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/local/entity/ImageEntity.kt

@@ -4,7 +4,7 @@ import androidx.room.Entity
 import androidx.room.PrimaryKey
 
 @Entity(tableName = "images")
-data class ImageEntity (
+data class ImageEntity(
     @PrimaryKey(autoGenerate = true) val id: Int,
     val path: String,
     val name: String,

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/models/chat/AlarmModel.kt

@@ -1,3 +1,8 @@
 package com.matthaigh27.chatgptwrapper.data.models.chat
 
-data class AlarmModel(val id: Int, val time: Long, val enabled: Boolean, val label: String)
+data class AlarmModel(
+    val id: Int,
+    val time: Long,
+    val enabled: Boolean,
+    val label: String
+)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/models/chat/ChatMessageModel.kt

@@ -8,29 +8,4 @@ data class ChatMessageModel(
     val data: JsonElement? = null,
     val hasImage: Boolean = false,
     val image: ByteArray? = null,
-) {
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (javaClass != other?.javaClass) return false
-
-        other as ChatMessageModel
-
-        if (type != other.type) return false
-        if (content != other.content) return false
-        if (data != other.data) return false
-        if (image != null) {
-            if (other.image == null) return false
-            if (!image.contentEquals(other.image)) return false
-        } else if (other.image != null) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int {
-        var result = type
-        result = 31 * result + content.hashCode()
-        result = 31 * result + (data?.hashCode() ?: 0)
-        result = 31 * result + (image?.contentHashCode() ?: 0)
-        return result
-    }
-}
+)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/models/chat/HelpCommandModel.kt

@@ -1,6 +1,6 @@
 package com.matthaigh27.chatgptwrapper.data.models.chat
 
-data class HelpCommandModel (
+data class HelpCommandModel(
     var main: String? = null,
     var assist: String? = null
 )

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/models/chat/MailModel.kt

@@ -0,0 +1,10 @@
+package com.matthaigh27.chatgptwrapper.data.models.chat
+
+data class MailModel(
+    val from: String,
+    val to: String,
+    val date: String,
+    val cc: String,
+    val subject: String,
+    val body: String,
+)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/models/chatwidgetprops/MailsProps.kt

@@ -0,0 +1,20 @@
+package com.matthaigh27.chatgptwrapper.data.models.chatwidgetprops
+
+import com.google.gson.Gson
+import com.matthaigh27.chatgptwrapper.data.models.chat.MailModel
+
+data class MailsProps(
+    val mails: ArrayList<MailModel>
+) {
+    override fun toString(): String {
+        val gson = Gson()
+        return gson.toJson(this)
+    }
+
+    companion object {
+        fun init(string: String): MailsProps {
+            val gson = Gson()
+            return gson.fromJson(string, MailsProps::class.java)
+        }
+    }
+}

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/models/chatwidgetprops/ScheduleAlarmProps.kt

@@ -9,29 +9,6 @@ data class ScheduleAlarmProps(
     val label: String? = null,
     val repeat: BooleanArray? = null
 ) {
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (javaClass != other?.javaClass) return false
-
-        other as ScheduleAlarmProps
-
-        if (time != other.time) return false
-        if (repeat != null) {
-            if (other.repeat == null) return false
-            if (!repeat.contentEquals(other.repeat)) return false
-        } else if (other.repeat != null) return false
-        if (label != other.label) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int {
-        var result = time?.hashCode() ?: 0
-        result = 31 * result + (repeat?.contentHashCode() ?: 0)
-        result = 31 * result + (label?.hashCode() ?: 0)
-        return result
-    }
-
     override fun toString(): String {
         val gson = Gson()
         return gson.toJson(this)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/ApiClient.kt

@@ -1,25 +1,27 @@
 package com.matthaigh27.chatgptwrapper.data.remote
 
 import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.API_BASE_URL
-import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.TIME_OUT_CALL
-import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.TIME_OUT_CONNECT
-import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.TIME_OUT_READ
-import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.TIME_OUT_WRITE
 import okhttp3.OkHttpClient
-import okhttp3.logging.HttpLoggingInterceptor
 import retrofit2.Retrofit
 import retrofit2.converter.gson.GsonConverterFactory
 import java.util.concurrent.TimeUnit
 
 object ApiClient {
-    private val client = OkHttpClient.Builder()
+    val TIME_OUT_CALL = 60L
+    val TIME_OUT_CONNECT = 60L
+    val TIME_OUT_READ = 60L
+    val TIME_OUT_WRITE = 60L
+
+    private val client = OkHttpClient
+        .Builder()
         .callTimeout(TIME_OUT_CALL, TimeUnit.SECONDS)
         .connectTimeout(TIME_OUT_CONNECT, TimeUnit.SECONDS)
         .readTimeout(TIME_OUT_READ, TimeUnit.SECONDS)
         .writeTimeout(TIME_OUT_WRITE, TimeUnit.SECONDS)
         .build()
 
-    private val retrofit = Retrofit.Builder()
+    private val retrofit = Retrofit
+        .Builder()
         .baseUrl(API_BASE_URL)
         .addConverterFactory(GsonConverterFactory.create())
         .client(client)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/ApiResource.kt

@@ -1,8 +1,7 @@
 package com.matthaigh27.chatgptwrapper.data.remote
 
 sealed class ApiResource<T>(
-    val data: T? = null,
-    val message: String? = null
+    val data: T? = null, val message: String? = null
 ) {
     class Success<T>(data: T) : ApiResource<T>(data)
     class Error<T>(message: String, data: T? = null) : ApiResource<T>(data, message)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/ApiService.kt

@@ -1,8 +1,11 @@
 package com.matthaigh27.chatgptwrapper.data.remote
 
+import com.matthaigh27.chatgptwrapper.data.models.chat.MailModel
 import com.matthaigh27.chatgptwrapper.data.remote.requests.BaseApiRequest
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ComposeMailApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.ImageRelatednessApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.NotificationApiRequest
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ReadMailApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.TrainContactsApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.TrainImageApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.responses.ApiResponse
@@ -16,13 +19,23 @@ import retrofit2.http.POST
 
 interface ApiService {
     @POST("commands")
-    fun getAllHelpCommands(@Body request: BaseApiRequest) : Call<ApiResponse<HelpCommandResult>>
+    fun getAllHelpCommands(@Body request: BaseApiRequest): Call<ApiResponse<HelpCommandResult>>
+
     @POST("sendNotification")
-    fun sendNotification(@Body request: NotificationApiRequest) : Call<ApiResponse<CommonResult>>
+    fun sendNotification(@Body request: NotificationApiRequest): Call<ApiResponse<CommonResult>>
+
     @POST("train/contacts")
-    fun trainContacts(@Body request: TrainContactsApiRequest) : Call<ApiResponse<String>>
+    fun trainContacts(@Body request: TrainContactsApiRequest): Call<ApiResponse<String>>
+
     @POST("image_relatedness")
-    fun getImageRelatedness(@Body request: ImageRelatednessApiRequest) : Call<ApiResponse<ImageRelatenessResult>>
+    fun getImageRelatedness(@Body request: ImageRelatednessApiRequest): Call<ApiResponse<ImageRelatenessResult>>
+
     @POST("uploadImage")
-    fun trainImage(@Body request: TrainImageApiRequest) : Call<ApiResponse<TrainImageResult>>
+    fun trainImage(@Body request: TrainImageApiRequest): Call<ApiResponse<TrainImageResult>>
+
+    @POST("email/read_emails")
+    fun readEmails(@Body request: ReadMailApiRequest): Call<ApiResponse<ArrayList<MailModel>>>
+
+    @POST("email/send_email")
+    fun sendEmail(@Body request: ComposeMailApiRequest): Call<ApiResponse<String>>
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/requests/ComposeMailApiRequest.kt

@@ -0,0 +1,19 @@
+package com.matthaigh27.chatgptwrapper.data.remote.requests
+
+import com.matthaigh27.chatgptwrapper.data.remote.requests.common.Keys
+
+data class ComposeMailApiRequest(
+    val data: ComposeMailData,
+    val confs: Keys
+)
+
+data class ComposeMailData(
+    private val sender: String,
+    private val pwd: String,
+    private val to: String,
+    private val subject: String,
+    private val body: String,
+    private val to_send: Boolean,
+    private val filename: String,
+    private val file_content: String
+)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/requests/ReadMailApiRequest.kt

@@ -0,0 +1,14 @@
+package com.matthaigh27.chatgptwrapper.data.remote.requests
+
+import com.matthaigh27.chatgptwrapper.data.remote.requests.common.Keys
+
+data class ReadMailApiRequest(
+    val data: ReadMailData,
+    val confs: Keys
+)
+
+data class ReadMailData(
+    val sender: String,
+    val pwd: String,
+    val imap_folder: String,
+)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/responses/ApiResponse.kt

@@ -1,6 +1,6 @@
 package com.matthaigh27.chatgptwrapper.data.remote.responses
 
-data class ApiResponse <T> (
+data class ApiResponse<T>(
     val status_code: Int,
     val message: List<String>,
     val result: T

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/responses/results/CommonResult.kt

@@ -2,7 +2,7 @@ package com.matthaigh27.chatgptwrapper.data.remote.responses.results
 
 import com.google.gson.JsonElement
 
-data class CommonResult (
+data class CommonResult(
     val program: String,
     val content: JsonElement
 )

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/remote/responses/results/ImageRelatenessResult.kt

@@ -5,7 +5,7 @@ data class ImageRelatenessResult(
     val content: ImageRelatenessContent
 )
 
-data class ImageRelatenessContent (
+data class ImageRelatenessContent(
     val image_name: String,
     val image_desc: String
 )

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/repository/FirebaseRepository.kt

@@ -1,21 +1,15 @@
 package com.matthaigh27.chatgptwrapper.data.repository
 
 import com.google.firebase.storage.FirebaseStorage
-import com.google.protobuf.Empty
-import com.matthaigh27.chatgptwrapper.data.models.chat.AutoTaskModel
-import com.matthaigh27.chatgptwrapper.data.remote.ApiResource
 import com.matthaigh27.chatgptwrapper.utils.helpers.OnFailure
 import com.matthaigh27.chatgptwrapper.utils.helpers.OnSuccess
-import kotlinx.coroutines.suspendCancellableCoroutine
 import java.util.UUID
 import kotlin.coroutines.resume
 import kotlin.coroutines.suspendCoroutine
 
 object FirebaseRepository {
     fun downloadImageWithName(
-        name: String,
-        onSuccess: OnSuccess<ByteArray>,
-        onFailure: OnFailure<String>
+        name: String, onSuccess: OnSuccess<ByteArray>, onFailure: OnFailure<String>
     ) {
         val reference = "images/$name"
 
@@ -29,9 +23,7 @@ object FirebaseRepository {
     }
 
     fun uploadImageAsync(
-        imageByteArray: ByteArray,
-        onSuccess: OnSuccess<String>,
-        onFailure: OnFailure<String>
+        imageByteArray: ByteArray, onSuccess: OnSuccess<String>, onFailure: OnFailure<String>
     ) {
         val storageRef = FirebaseStorage.getInstance().reference
         val uuid = UUID.randomUUID()

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/repository/RemoteRepository.kt

@@ -1,12 +1,15 @@
 package com.matthaigh27.chatgptwrapper.data.repository
 
 import com.matthaigh27.chatgptwrapper.RisingApplication.Companion.appContext
+import com.matthaigh27.chatgptwrapper.data.models.chat.MailModel
 import com.matthaigh27.chatgptwrapper.data.models.setting.SettingModel
 import com.matthaigh27.chatgptwrapper.data.remote.ApiClient
 import com.matthaigh27.chatgptwrapper.data.remote.ApiResource
 import com.matthaigh27.chatgptwrapper.data.remote.requests.BaseApiRequest
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ComposeMailApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.ImageRelatednessApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.NotificationApiRequest
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ReadMailApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.TrainContactsApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.TrainImageApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.common.Keys
@@ -45,7 +48,8 @@ object RemoteRepository {
     }
 
     fun getAllHelpCommands(
-        onSuccess: OnSuccess<ApiResponse<HelpCommandResult>>, onFailure: OnFailure<String>
+        onSuccess: OnSuccess<ApiResponse<HelpCommandResult>>,
+        onFailure: OnFailure<String>
     ) {
         val call = apiService.getAllHelpCommands(BaseApiRequest(getKeys()))
 
@@ -154,4 +158,52 @@ object RemoteRepository {
             }
         })
     }
+
+    fun readEmails(
+        request: ReadMailApiRequest,
+        onSuccess: OnSuccess<ApiResponse<ArrayList<MailModel>>>,
+        onFailure: OnFailure<String>
+    ) {
+        val call = apiService.readEmails(request)
+
+        call.enqueue(object : Callback<ApiResponse<ArrayList<MailModel>>> {
+            override fun onResponse(
+                call: Call<ApiResponse<ArrayList<MailModel>>>, response: Response<ApiResponse<ArrayList<MailModel>>>
+            ) {
+                response.body()?.let { data ->
+                    onSuccess(data)
+                } ?: run {
+                    onFailure(response.message())
+                }
+            }
+
+            override fun onFailure(call: Call<ApiResponse<ArrayList<MailModel>>>, t: Throwable) {
+                onFailure(t.message.toString())
+            }
+        })
+    }
+
+    fun sendEmail(
+        request: ComposeMailApiRequest,
+        onSuccess: OnSuccess<ApiResponse<String>>,
+        onFailure: OnFailure<String>
+    ) {
+        val call = apiService.sendEmail(request)
+
+        call.enqueue(object : Callback<ApiResponse<String>> {
+            override fun onResponse(
+                call: Call<ApiResponse<String>>, response: Response<ApiResponse<String>>
+            ) {
+                response.body()?.let { data ->
+                    onSuccess(data)
+                } ?: run {
+                    onFailure(response.message())
+                }
+            }
+
+            override fun onFailure(call: Call<ApiResponse<String>>, t: Throwable) {
+                onFailure(t.message.toString())
+            }
+        })
+    }
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/data/repository/SharedPreferencesRepository.kt

@@ -1,7 +1,6 @@
 package com.matthaigh27.chatgptwrapper.data.repository
 
 import android.content.Context
-import android.content.SharedPreferences
 import com.matthaigh27.chatgptwrapper.RisingApplication.Companion.appContext
 import com.matthaigh27.chatgptwrapper.data.models.setting.SettingModel
 import com.matthaigh27.chatgptwrapper.utils.helpers.chat.SettingHelper.emptySettingModel
@@ -18,7 +17,7 @@ object SharedPreferencesRepository {
     fun getConfig(): SettingModel {
         val sharedPreferences = appContext.getSharedPreferences("prefs", Context.MODE_PRIVATE)
         val jsonString = sharedPreferences.getString("config", "")
-        if(jsonString == "" || jsonString == null) {
+        if (jsonString == "" || jsonString == null) {
             return emptySettingModel()
         } else {
             return SettingModel.init(jsonString)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/ChatActivity.kt

@@ -1,100 +1,16 @@
 package com.matthaigh27.chatgptwrapper.ui.chat.view
 
-import android.Manifest
-import android.annotation.SuppressLint
-import android.content.pm.PackageManager
-import android.os.Build
 import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
 import com.matthaigh27.chatgptwrapper.R
 import com.matthaigh27.chatgptwrapper.ui.base.BaseActivity
-import com.matthaigh27.chatgptwrapper.ui.chat.view.dialogs.ConfirmDialog
 import com.matthaigh27.chatgptwrapper.ui.chat.view.fragments.ChatMainFragment
 
 
 class ChatActivity : BaseActivity() {
-
-    private val PERMISSIONS_REQUEST_CODE = 1
-    private lateinit var permissions: Array<String>
-    private val CONFIRM_MESSAGE =
-        "This app requires SMS, Contacts and Phone " +
-                "permissions to function properly. " +
-                "Please grant the necessary permissions."
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_chat)
-
-        requestPermissions()
-    }
-
-    private fun requestPermissions() {
-        /**
-         * In mobile phones that use Google API 33 or higher, the permission for reading external storage
-         * is disabled because the phones don't support the feature.
-         */
-        permissions = if(Build.VERSION.SDK_INT > Build.VERSION_CODES.S_V2) {
-            arrayOf(
-                Manifest.permission.SEND_SMS,
-                Manifest.permission.READ_CONTACTS,
-                Manifest.permission.CALL_PHONE
-            )
-        } else {
-            arrayOf(
-                Manifest.permission.SEND_SMS,
-                Manifest.permission.READ_CONTACTS,
-                Manifest.permission.CALL_PHONE,
-                Manifest.permission.READ_EXTERNAL_STORAGE
-            )
-        }
-        val notGrantedPermissions = permissions.filter {
-            checkSelfPermission(it) != PackageManager.PERMISSION_GRANTED
-        }
-
-        if (notGrantedPermissions.isNotEmpty()) {
-            if (shouldShowRequestPermissionRationale(notGrantedPermissions[0])) {
-                // show custom permission rationale
-                val confirmDialog = ConfirmDialog(this@ChatActivity)
-                confirmDialog.setOnClickListener(object :
-                    ConfirmDialog.OnDialogButtonClickListener {
-                    override fun onPositiveButtonClick() {
-                        requestPermissions(
-                            notGrantedPermissions.toTypedArray(), PERMISSIONS_REQUEST_CODE
-                        )
-                    }
-
-                    override fun onNegativeButtonClick() {
-                        finish()
-                    }
-                })
-
-                confirmDialog.show()
-                confirmDialog.setMessage(CONFIRM_MESSAGE)
-
-            } else {
-                requestPermissions(notGrantedPermissions.toTypedArray(), PERMISSIONS_REQUEST_CODE)
-            }
-        } else {
-            // Permissions already granted, navigate to your desired fragment
-            navigateToChatMainFragment()
-        }
-    }
-
-    @SuppressLint("MissingSuperCall")
-    override fun onRequestPermissionsResult(
-        requestCode: Int, permissions: Array<out String>, grantResults: IntArray
-    ) {
-        when (requestCode) {
-            PERMISSIONS_REQUEST_CODE -> {
-                if (grantResults.all { it == PackageManager.PERMISSION_GRANTED }) {
-                    // Permissions granted, navigate to your desired fragment
-                    navigateToChatMainFragment()
-                } else {
-                    requestPermissions()
-                }
-                return
-            }
-        }
+        navigateToChatMainFragment()
     }
 
     private fun navigateToChatMainFragment() {

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/adapters/ChatMainAdapter.kt

@@ -14,6 +14,7 @@ import androidx.recyclerview.widget.RecyclerView
 import com.matthaigh27.chatgptwrapper.R
 import com.matthaigh27.chatgptwrapper.data.models.chat.ChatMessageModel
 import com.matthaigh27.chatgptwrapper.data.models.chat.HelpPromptModel
+import com.matthaigh27.chatgptwrapper.data.models.chatwidgetprops.MailsProps
 import com.matthaigh27.chatgptwrapper.data.models.chatwidgetprops.ScheduleAlarmProps
 import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.ChatMessageInterface
 import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.OnHideListener
@@ -21,10 +22,12 @@ import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.SendSmsWid
 import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.alarm.ScheduleAlarmWidget
 import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.contact.ContactWidget
 import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.helpprompt.HelpPromptWidget
+import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.mail.ComposeMailWidget
 import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.mail.MailWidget
-import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.mail.compose.ComposeMailWidget
+import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.mail.ReadMailWidget
 import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.PROPS_WIDGET_DESC
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_HELP_PROMPT
+import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_MAILS
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_MAIL_READ
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_MAIL_WRITE
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_SCHEDULE_ALARM
@@ -35,19 +38,29 @@ import com.matthaigh27.chatgptwrapper.utils.helpers.chat.ContactHelper.getContac
 import com.matthaigh27.chatgptwrapper.utils.helpers.chat.ImageHelper
 import org.json.JSONArray
 
+/**
+ * This adapter class is used to display a list of chat messages on a recycler view.
+ */
 class ChatMainAdapter(
     context: Context, list: ArrayList<ChatMessageModel>, callbacks: ChatMessageInterface
 ) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
 
+    /**
+     * These variables are used to presents the type of messages
+     */
     private val VIEW_TYPE_MSG_SENT = 0
     private val VIEW_TYPE_MSG_RECEIVED = 1
     private val VIEW_TYPE_CHAT_WIDGET = 2
     private val VIEW_TYPE_CHAT_ERROR = 3
 
     private var context: Context
-    private var callbacks: ChatMessageInterface
     private var chatMessageList: ArrayList<ChatMessageModel> = ArrayList()
 
+    /**
+     * This is a callback that retrieves result from chat widgets.
+     */
+    private var callbacks: ChatMessageInterface
+
     init {
         this.context = context
         this.chatMessageList = list
@@ -114,7 +127,13 @@ class ChatMainAdapter(
         }
     }
 
+    /**
+     * This function is used to set data for common messages.
+     */
     private fun setMessageData(holder: MessageViewHolder, data: ChatMessageModel) {
+        /**
+         * If an image is included into a message, the image is displayed by below code.
+         */
         if (data.hasImage) {
             data.image?.let { image ->
                 val originBitmap = BitmapFactory.decodeByteArray(image, 0, image.size)
@@ -140,12 +159,18 @@ class ChatMainAdapter(
         }
     }
 
+    /**
+     * This function is used to display chat widgets on a recycler view.
+     */
     private fun setMessageData(holder: ChatWidgetViewHolder, data: ChatMessageModel) {
         holder.itemLayout.visibility = View.VISIBLE
         holder.llHorizontalScroll.removeAllViews()
         holder.itemLayout.removeAllViews()
         val index = holder.adapterPosition
 
+        /**
+         * Depending on type of widget, the proper widget is displayed.
+         */
         when (data.content) {
             TYPE_WIDGET_SMS -> {
                 val sendSmsWidget = SendSmsWidget(context).apply {
@@ -222,19 +247,46 @@ class ChatMainAdapter(
                 holder.itemLayout.addView(scheduleAlarmWidget)
             }
 
-            TYPE_WIDGET_MAIL_READ -> {
+            TYPE_WIDGET_MAILS -> {
                 holder.llHorizontalScroll.visibility = View.VISIBLE
+                val props = data.data?.run {
+                    val widgetDesc = data.data.asJsonObject[PROPS_WIDGET_DESC].asString
+                    MailsProps.init(widgetDesc)
+                }
 
-                for (i in 0 until 10) {
-                    val mailWidget = MailWidget(context).apply {
+                props?.mails?.forEach { mail ->
+                    val mailWidget = MailWidget(context, mail).apply {
                         this.callback = callbacks
                     }
                     holder.llHorizontalScroll.addView(mailWidget)
                 }
             }
 
+            TYPE_WIDGET_MAIL_READ -> {
+                val readMailWidget = ReadMailWidget(context).apply {
+                    this.callback = callbacks
+                    this.hideListener = object : OnHideListener {
+                        override fun hide() {
+                            holder.itemLayout.visibility = View.GONE
+                            chatMessageList.removeAt(index)
+                            notifyItemRemoved(index)
+                        }
+                    }
+                }
+                holder.itemLayout.addView(readMailWidget)
+            }
+
             TYPE_WIDGET_MAIL_WRITE -> {
-                val composeMailWIdget = ComposeMailWidget(context)
+                val composeMailWIdget = ComposeMailWidget(context).apply {
+                    this.callback = callbacks
+                    this.hideListener = object : OnHideListener {
+                        override fun hide() {
+                            holder.itemLayout.visibility = View.GONE
+                            chatMessageList.removeAt(index)
+                            notifyItemRemoved(index)
+                        }
+                    }
+                }
                 holder.itemLayout.addView(composeMailWIdget)
             }
 
@@ -244,6 +296,9 @@ class ChatMainAdapter(
         }
     }
 
+    /**
+     * ViewHolder for common messages with message and image
+     */
     inner class MessageViewHolder internal constructor(itemView: View) :
         RecyclerView.ViewHolder(itemView) {
         var txtMessage: TextView
@@ -257,6 +312,9 @@ class ChatMainAdapter(
         }
     }
 
+    /**
+     * ViewHolder for chat widgets
+     */
     inner class ChatWidgetViewHolder internal constructor(itemView: View) :
         RecyclerView.ViewHolder(itemView) {
         var itemLayout: FrameLayout

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/dialogs/ConfirmDialog.kt

@@ -12,6 +12,9 @@ import android.widget.Button
 import android.widget.TextView
 import com.matthaigh27.chatgptwrapper.R
 
+/**
+ * This dialog is used to show confirm message to users.
+ */
 class ConfirmDialog(context: Context) : Dialog(context), View.OnClickListener {
 
     private var txtMessage: TextView? = null

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/fragments/ChatMainFragment.kt

@@ -23,6 +23,8 @@ import com.matthaigh27.chatgptwrapper.R
 import com.matthaigh27.chatgptwrapper.data.models.chat.ChatMessageModel
 import com.matthaigh27.chatgptwrapper.data.models.chat.HelpCommandModel
 import com.matthaigh27.chatgptwrapper.data.models.chat.HelpPromptModel
+import com.matthaigh27.chatgptwrapper.data.models.chat.MailModel
+import com.matthaigh27.chatgptwrapper.data.models.chatwidgetprops.MailsProps
 import com.matthaigh27.chatgptwrapper.data.models.chatwidgetprops.ScheduleAlarmProps
 import com.matthaigh27.chatgptwrapper.data.models.common.Time
 import com.matthaigh27.chatgptwrapper.data.remote.ApiResource
@@ -33,9 +35,11 @@ import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.ChatMessageInterfa
 import com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.toolbar.ChatToolsWidget
 import com.matthaigh27.chatgptwrapper.ui.chat.viewmodel.ChatViewModel
 import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.ERROR_MSG_NOEXIST_COMMAND
+import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.ERROR_MSG_UNKNOWN_ERROR
 import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.HELP_COMMAND_ALL
 import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.PROPS_WIDGET_DESC
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_HELP_PROMPT
+import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_MAILS
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_MAIL_READ
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_MAIL_WRITE
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeChatWidgetConstants.TYPE_WIDGET_SCHEDULE_ALARM
@@ -50,8 +54,10 @@ import com.matthaigh27.chatgptwrapper.utils.constants.TypeResponseConstants.TYPE
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeResponseConstants.TYPE_RESPONSE_MAIL_SEND
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeResponseConstants.TYPE_RESPONSE_MAIL_WRITE
 import com.matthaigh27.chatgptwrapper.utils.constants.TypeResponseConstants.TYPE_RESPONSE_MESSAGE
+import com.matthaigh27.chatgptwrapper.utils.constants.TypeResponseConstants.TYPE_RESPONSE_SMS
 import com.matthaigh27.chatgptwrapper.utils.helpers.Converter
 import com.matthaigh27.chatgptwrapper.utils.helpers.Converter.responseToHelpPromptList
+import com.matthaigh27.chatgptwrapper.utils.helpers.OnSuccess
 import com.matthaigh27.chatgptwrapper.utils.helpers.chat.CommandHelper.getHelpCommandFromStr
 import com.matthaigh27.chatgptwrapper.utils.helpers.chat.CommandHelper.isMainHelpCommand
 import com.matthaigh27.chatgptwrapper.utils.helpers.chat.CommandHelper.makePromptItemUsage
@@ -59,8 +65,17 @@ import com.matthaigh27.chatgptwrapper.utils.helpers.chat.CommandHelper.makePromp
 import com.matthaigh27.chatgptwrapper.utils.helpers.ui.NoNewLineInputFilter
 import org.json.JSONArray
 
+/**
+ * A ChatMainFragment class is a class for chatting with users and show the result that
+ * our AI plugin - Brain returned.
+ *
+ * In this class, almost important features are implemented.
+ */
 class ChatMainFragment : Fragment(), OnClickListener {
 
+    /**
+     * These variables(TYPE_CHAT_XXX) are variables that present type of widget to display on chatting list.
+     */
     private val TYPE_CHAT_SENT = 0
     private val TYPE_CHAT_RECEIVE = 1
     private val TYPE_CHAT_WIDGET = 2
@@ -69,10 +84,12 @@ class ChatMainFragment : Fragment(), OnClickListener {
     private lateinit var rootView: View
     lateinit var viewModel: ChatViewModel
 
-    /** View Components */
     private var loadingRotate: RotateAnimation? = null
     private var edtMessageInput: EditText? = null
 
+    /**
+     * These variables are for recyclerview that shows chatting list items.
+     */
     private var rvChatList: RecyclerView? = null
     private var chatMainAdapter: ChatMainAdapter? = null
     private var chatMessageList: ArrayList<ChatMessageModel> = ArrayList()
@@ -81,9 +98,16 @@ class ChatMainFragment : Fragment(), OnClickListener {
     private var chatToolsWidget: ChatToolsWidget? = null
     private var helpPromptList: ArrayList<HelpPromptModel>? = null
 
-    private var currentSelectedImage: ByteArray? = null
-    private var currentUploadedImageName: String? = null
-    private var isImagePicked: Boolean = false
+    /**
+     * These variables are used to identify whether users picked an image to send to Brain.
+     */
+    private var currentSelectedImage: ByteArray? =
+        null // bytearray data of a picked image by camera or gallery
+    private var currentUploadedImageName: String? =
+        null // resource name that is uploaded to firebase storage
+    private var isImagePicked: Boolean =
+        false // boolean variable that presents whether users picked an image
+
     private var showLoadingCount = 0
 
     override fun onCreateView(
@@ -95,6 +119,9 @@ class ChatMainFragment : Fragment(), OnClickListener {
     }
 
     private fun init() {
+        /**
+         * These are functions to init views
+         */
         initViewModel()
         initLoadingRotate()
         initButtonsClickListener()
@@ -105,11 +132,16 @@ class ChatMainFragment : Fragment(), OnClickListener {
         fetchAllCommands()
     }
 
-
+    /**
+     * This function is used to init viewmodel.
+     */
     private fun initViewModel() {
         viewModel = ViewModelProvider(this)[ChatViewModel::class.java]
     }
 
+    /**
+     * This function is used to init rotate animation for loading spinner.
+     */
     private fun initLoadingRotate() {
         loadingRotate = RotateAnimation(/* fromDegrees = */ 0f, /* toDegrees = */
             720f, /* pivotXType = */
@@ -124,11 +156,17 @@ class ChatMainFragment : Fragment(), OnClickListener {
         }
     }
 
+    /**
+     * In this function, click listener is set to buttons on main chat interface.
+     */
     private fun initButtonsClickListener() {
         rootView.findViewById<View>(R.id.btn_open_chat_tools).setOnClickListener(this)
         rootView.findViewById<View>(R.id.btn_audio_recognition).setOnClickListener(this)
     }
 
+    /**
+     * Send text message to Brain when users finish typing text to EditText component.
+     */
     private fun initChatInputListener() {
         edtMessageInput = rootView.findViewById(R.id.edt_message)
         edtMessageInput?.filters = edtMessageInput?.filters?.plus(NoNewLineInputFilter())
@@ -141,7 +179,13 @@ class ChatMainFragment : Fragment(), OnClickListener {
         }
     }
 
+    /**
+     * This function is used to init recyclerview that stores chatting messages.
+     */
     private fun initChatRecyclerView() {
+        /**
+         * Init callback function that binds the event emitted in all chat widgets
+         */
         initChatInterface()
 
         rvChatList = rootView.findViewById(R.id.rv_chat_list)
@@ -153,6 +197,10 @@ class ChatMainFragment : Fragment(), OnClickListener {
         rvChatList?.layoutManager = LinearLayoutManager(context)
     }
 
+    /**
+     * This function is used to init chat tool widget that pops up when users click plus button
+     * at the right bottom corner.
+     */
     private fun initChatToolsWidget() {
         chatToolsWidget = ChatToolsWidget(requireContext(), requireActivity()).apply {
             this.callback = chatMessageInterface
@@ -161,6 +209,14 @@ class ChatMainFragment : Fragment(), OnClickListener {
         llToolBar.addView(chatToolsWidget)
     }
 
+    /**
+     * This function is used to show loading spinner.
+     *
+     * If isLoading is true, loading spinner is displayed. But loading spinner might not be visible,
+     * even though isLoading is true. Current visible loading spinner count should be 0 to make loading spinner invisible.
+     *
+     * @param isLoading boolean parameter that presents whether loading spinner is visible
+     */
     private fun showLoading(isLoading: Boolean) {
         val imgLoading = rootView.findViewById<ImageView>(R.id.sp_loading)
 
@@ -179,6 +235,19 @@ class ChatMainFragment : Fragment(), OnClickListener {
         }
     }
 
+    /**
+     * This function is used mostly to add messages to chatting list.
+     *
+     * According to type of message, messages can be common messages or widgets for sending sms, setting an alarm, sending help prompt, etc.
+     * Depending on whether an image is contained into message, different network functions are executed.
+     * If message start with '/', help prompt widget is displayed.
+     *
+     * @param type A variable that present type of chat messages
+     * @param content Contains content of message to present
+     * @param data Contains properties of widget as json string when type is widget.
+     * @param hasImage Presents whether an image is contained into message
+     * @param image If a message has an image, this variable is used to store the bytearray data of the contained image.
+     */
     private fun addMessage(
         type: Int,
         content: String? = null,
@@ -188,11 +257,17 @@ class ChatMainFragment : Fragment(), OnClickListener {
     ) {
         when (type) {
             TYPE_CHAT_SENT -> {
+                /**
+                 * If message starts with '/', help prompt widget is displayed.
+                 */
                 if (content!!.isNotEmpty() && content.first() == '/') {
                     openHelpPromptWidget(content)
                     return
                 }
                 if (isImagePicked) {
+                    /**
+                     * If an image is contained into a message, image relatedness function is executed.
+                     */
                     addChatItemToList(
                         ChatMessageModel(
                             type = type,
@@ -205,6 +280,9 @@ class ChatMainFragment : Fragment(), OnClickListener {
                     fetchImageRelatedness(currentUploadedImageName!!, content)
                     isImagePicked = false
                 } else {
+                    /**
+                     * If not, send notification function is executed.
+                     */
                     addChatItemToList(ChatMessageModel(type, content, data, hasImage, image))
                     sendNotification(content)
                 }
@@ -216,6 +294,9 @@ class ChatMainFragment : Fragment(), OnClickListener {
         }
     }
 
+    /**
+     * This function is used to display messages to show errors in more detail to users
+     */
     private fun addErrorMessage(
         message: String
     ) {
@@ -233,42 +314,49 @@ class ChatMainFragment : Fragment(), OnClickListener {
         rvChatList?.scrollToPosition(chatMessageList.size - 1)
     }
 
-    private fun trainContacts() {
-        viewModel.trainContacts().observe(viewLifecycleOwner) { resource ->
-            when (resource) {
-                is ApiResource.Loading -> {
-                    showLoading(true)
-                }
-
-                is ApiResource.Success -> {
-                    showLoading(false)
-                }
-
-                is ApiResource.Error -> {
-                    showLoading(false)
-                }
+    /**
+     * This function is used to process ApiResource data from viewmodel.
+     *
+     * When status is loading or error, default functions are executed. When success, onSuccess
+     * lambda function is executed.
+     *
+     * @param resource A ApiResource that is retrieved from ViewModel
+     * @param onSuccess A lambda function to process the resource data
+     */
+    private fun <T> commonProcessResource(
+        resource: ApiResource<T>,
+        onSuccess: OnSuccess<ApiResource<T>>
+    ) {
+        when (resource) {
+            is ApiResource.Loading -> {
+                showLoading(true)
             }
-        }
-    }
 
-    private fun trainImages() {
-        viewModel.trainImages().observe(viewLifecycleOwner) { resource ->
-            when (resource) {
-                is ApiResource.Loading -> {
-                    showLoading(true)
-                }
+            is ApiResource.Success -> {
+                showLoading(false)
+                onSuccess(resource)
+            }
 
-                is ApiResource.Success -> {
-                    showLoading(false)
+            is ApiResource.Error -> {
+                showLoading(false)
+                resource.message?.let {
+                    addErrorMessage(resource.message)
+                } ?: run {
+                    addErrorMessage(ERROR_MSG_UNKNOWN_ERROR)
                 }
 
-                is ApiResource.Error -> {
-                    showLoading(false)
-                }
             }
         }
     }
 
+    /**
+     * Open help prompt widgets when message is valid help command.
+     *
+     * @param message A String variable that contains message users sent
+     * If message is /help, all the description of help commands is displayed,
+     * If message is /help prompt name, the description of a given prompt help command is displayed.
+     * If message is /prompt name, A help prompt widget about the given name is displayed.
+     */
     private fun openHelpPromptWidget(message: String) {
         try {
             val command: HelpCommandModel = getHelpCommandFromStr(message)
@@ -318,112 +406,90 @@ class ChatMainFragment : Fragment(), OnClickListener {
                 }
             }
         } catch (e: Exception) {
-            e.printStackTrace()
             addErrorMessage(e.message.toString())
         }
     }
 
 
+    /**
+     * This Network function is used to fetch all help commands
+     */
     private fun fetchAllCommands() {
         viewModel.getAllHelpCommands().observe(viewLifecycleOwner) { resource ->
-            when (resource) {
-                is ApiResource.Loading -> {
-                    showLoading(true)
-                }
-
-                is ApiResource.Success -> {
-                    showLoading(false)
-                    resource.data?.let { data ->
-                        helpPromptList = responseToHelpPromptList(data.result.content)
-                    }
-                }
-
-                is ApiResource.Error -> {
-                    showLoading(false)
-                    addErrorMessage(resource.message!!)
+            commonProcessResource(resource) {
+                resource.data?.let { data ->
+                    helpPromptList = responseToHelpPromptList(data.result.content)
                 }
             }
         }
     }
 
+    /**
+     * This Network function is used to fetch a similar image to image that is stored with imageName parameter
+     * in Firebase storage.
+     *
+     * @param imageName The image name of a image that a user uploaded to the Firebase
+     * @param message The description about the image
+     */
     private fun fetchImageRelatedness(imageName: String, message: String) {
         viewModel.getImageRelatedness(imageName, message).observe(viewLifecycleOwner) { resource ->
-            when (resource) {
-                is ApiResource.Loading -> {
-                    showLoading(true)
-                }
-
-                is ApiResource.Success -> {
-                    showLoading(false)
-                    addMessage(
-                        type = TYPE_CHAT_RECEIVE,
-                        content = resource.data?.description,
-                        data = null,
-                        hasImage = true,
-                        image = resource.data?.image
-                    )
-                }
-
-                is ApiResource.Error -> {
-                    showLoading(false)
-                    addErrorMessage(resource.message!!)
-                }
+            commonProcessResource(resource) {
+                addMessage(
+                    type = TYPE_CHAT_RECEIVE,
+                    content = resource.data?.description,
+                    data = null,
+                    hasImage = true,
+                    image = resource.data?.image
+                )
             }
         }
     }
 
+    /**
+     * This network function is used to retrieve a command analyzed with user's message by Brain
+     *
+     * @param message A message that users sent
+     */
     private fun sendNotification(message: String) {
         viewModel.sendNotification(message).observe(viewLifecycleOwner) { resource ->
-            when (resource) {
-                is ApiResource.Loading -> {
-                    showLoading(true)
-                }
-
-                is ApiResource.Success -> {
-                    showLoading(false)
-                    val apiResponse = resource.data
-                    when (apiResponse?.result?.program) {
-                        TYPE_RESPONSE_MESSAGE -> addMessage(
-                            TYPE_CHAT_RECEIVE, apiResponse.result.content.asString
-                        )
-
-                        TYPE_RESPONSE_BROWSER -> fetchResponseBrowser(apiResponse)
-                        TYPE_RESPONSE_CONTACT -> fetchResponseContact(apiResponse)
-                        TYPE_RESPONSE_IMAGE -> fetchResponseImage(apiResponse)
-                        TYPE_RESPONSE_ALARM -> fetchResponseAlarm(apiResponse)
-                        TYPE_RESPONSE_MAIL_READ -> fetchResponseMail(TYPE_RESPONSE_MAIL_READ)
-                        TYPE_RESPONSE_MAIL_WRITE -> fetchResponseMail(TYPE_RESPONSE_MAIL_WRITE)
-                        TYPE_RESPONSE_MAIL_SEND -> fetchResponseMail(TYPE_RESPONSE_MAIL_SEND)
-                        TYPE_RESPONSE_AUTO_TASK -> fetchResponseAutoTask(apiResponse)
-                        else -> addMessage(TYPE_CHAT_RECEIVE, apiResponse!!.result.toString())
-                    }
-                }
+            commonProcessResource(resource) {
+                val apiResponse = resource.data
+                when (apiResponse?.result?.program) {
+                    TYPE_RESPONSE_MESSAGE -> addMessage(
+                        TYPE_CHAT_RECEIVE,
+                        apiResponse.result.content.asString
+                    )
 
-                is ApiResource.Error -> {
-                    addErrorMessage(resource.message!!)
-                    showLoading(false)
+                    TYPE_RESPONSE_SMS -> addMessage(TYPE_CHAT_WIDGET, TYPE_WIDGET_SMS)
+                    TYPE_RESPONSE_BROWSER -> fetchResponseBrowser(apiResponse)
+                    TYPE_RESPONSE_CONTACT -> fetchResponseContact(apiResponse)
+                    TYPE_RESPONSE_IMAGE -> fetchResponseImage(apiResponse)
+                    TYPE_RESPONSE_ALARM -> fetchResponseAlarm(apiResponse)
+                    TYPE_RESPONSE_MAIL_READ -> fetchResponseMail(TYPE_RESPONSE_MAIL_READ)
+                    TYPE_RESPONSE_MAIL_WRITE -> fetchResponseMail(TYPE_RESPONSE_MAIL_WRITE)
+                    TYPE_RESPONSE_MAIL_SEND -> fetchResponseMail(TYPE_RESPONSE_MAIL_SEND)
+                    TYPE_RESPONSE_AUTO_TASK -> fetchResponseAutoTask(apiResponse)
+                    else -> addMessage(TYPE_CHAT_RECEIVE, apiResponse!!.result.toString())
                 }
             }
-
         }
     }
 
+    /**
+     * This function is used to process data from Brain that is for browser.
+     */
     private fun fetchResponseBrowser(apiResponse: ApiResponse<CommonResult>) {
         addMessage(TYPE_CHAT_RECEIVE, apiResponse.result.content.asString)
     }
 
+    /**
+     * This function is used to process data from Brain that is for image.
+     */
     private fun fetchResponseImage(apiResponse: ApiResponse<CommonResult>) {
         val content = apiResponse.result.content.asJsonObject
-        viewModel.downloadImageFromFirebase(
-            content["image_name"].asString
-        ).observe(viewLifecycleOwner) { resource ->
-            when (resource) {
-                is ApiResource.Loading -> {
-                    showLoading(true)
-                }
-
-                is ApiResource.Success -> {
-                    showLoading(false)
+        viewModel.downloadImageFromFirebase(content["image_name"].asString)
+            .observe(viewLifecycleOwner) { resource ->
+                commonProcessResource(resource) {
                     addMessage(
                         type = TYPE_CHAT_RECEIVE,
                         content = null,
@@ -432,15 +498,12 @@ class ChatMainFragment : Fragment(), OnClickListener {
                         image = resource.data
                     )
                 }
-
-                is ApiResource.Error -> {
-                    addErrorMessage(resource.message!!)
-                    showLoading(false)
-                }
             }
-        }
     }
 
+    /**
+     * This function is used to process data from Brain that is for contact.
+     */
     private fun fetchResponseContact(apiResponse: ApiResponse<CommonResult>) {
         val contactIds = JSONArray(apiResponse.result.content.asString.replace("'", "\""))
         if (contactIds.length() > 0) {
@@ -457,6 +520,9 @@ class ChatMainFragment : Fragment(), OnClickListener {
         }
     }
 
+    /**
+     * This function is used to process data from Brain that is for alarm.
+     */
     private fun fetchResponseAlarm(apiResponse: ApiResponse<CommonResult>) {
         val time: Time =
             Converter.stringToTime(apiResponse.result.content.asJsonObject.get("time").asString)
@@ -468,18 +534,13 @@ class ChatMainFragment : Fragment(), OnClickListener {
         addMessage(TYPE_CHAT_WIDGET, TYPE_WIDGET_SCHEDULE_ALARM, widgetDesc)
     }
 
+    /**
+     * This function is used to process data from Brain that is for mail.
+     */
     private fun fetchResponseMail(type: String) {
         when (type) {
-            TYPE_RESPONSE_MAIL_READ -> {
-                addMessage(TYPE_CHAT_WIDGET, TYPE_WIDGET_MAIL_READ)
-            }
-
-            TYPE_RESPONSE_MAIL_WRITE -> {
-                addMessage(TYPE_CHAT_WIDGET, TYPE_WIDGET_MAIL_WRITE)
-            }
-
-            TYPE_RESPONSE_MAIL_SEND -> {
-            }
+            TYPE_RESPONSE_MAIL_READ -> addMessage(TYPE_CHAT_WIDGET, TYPE_WIDGET_MAIL_READ)
+            TYPE_RESPONSE_MAIL_SEND -> addMessage(TYPE_CHAT_WIDGET, TYPE_WIDGET_MAIL_WRITE)
         }
     }
 
@@ -495,35 +556,47 @@ class ChatMainFragment : Fragment(), OnClickListener {
         ).observe(viewLifecycleOwner) { resource ->
             when (resource) {
                 is ApiResource.Loading -> {
+                    showLoading(true)
                     resource.data?.let { data ->
                         if (data.result == null) {
                             data.thoughts?.let { thoughts ->
                                 addMessage(
-                                    type = TYPE_CHAT_RECEIVE,
-                                    content = thoughts.speak
+                                    type = TYPE_CHAT_RECEIVE, content = thoughts.speak
                                 )
                             }
                         } else {
                             addMessage(
-                                type = TYPE_CHAT_RECEIVE,
-                                content = data.result
+                                type = TYPE_CHAT_RECEIVE, content = data.result
                             )
                         }
                     }
                 }
 
                 is ApiResource.Success -> {
+                    showLoading(false)
                     addMessage(TYPE_CHAT_RECEIVE, "Task is finished.")
                 }
 
                 is ApiResource.Error -> {
+                    showLoading(false)
+                    resource.message?.let {
+                        addErrorMessage(resource.message)
+                    } ?: run {
+                        addErrorMessage(ERROR_MSG_UNKNOWN_ERROR)
+                    }
                 }
             }
         }
     }
 
+    /**
+     * This interface is a callback function that retrieves the results of chat widgets.
+     */
     private fun initChatInterface() {
         chatMessageInterface = object : ChatMessageInterface {
+            /**
+             * When a user sends sms using SMS Widget, this function is called.
+             */
             override fun sentSms(phoneNumber: String, message: String) {
                 addMessage(
                     type = TYPE_CHAT_RECEIVE,
@@ -531,6 +604,9 @@ class ChatMainFragment : Fragment(), OnClickListener {
                 )
             }
 
+            /**
+             * When a user cancels sms using SMS Widget, this function is called.
+             */
             override fun canceledSms() {
                 addMessage(
                     type = TYPE_CHAT_RECEIVE,
@@ -538,30 +614,46 @@ class ChatMainFragment : Fragment(), OnClickListener {
                 )
             }
 
+            /**
+             * When a user sends help prompt using help Prompt Widget, this function is called.
+             */
             override fun sentHelpPrompt(prompt: String) {
                 addMessage(
                     type = TYPE_CHAT_SENT, content = prompt
                 )
             }
 
+            /**
+             * When a user cancels help prompt using help prompt Widget, this function is called.
+             */
             override fun canceledHelpPrompt() {
                 addMessage(
                     type = TYPE_CHAT_RECEIVE, content = "You canceled Help prompt."
                 )
             }
 
+            /**
+             * When a user makes a voice call after searching for contacts, this function is called.
+             */
             override fun doVoiceCall(phoneNumber: String) {
                 addMessage(
                     type = TYPE_CHAT_RECEIVE, content = "You made a voice call to $phoneNumber"
                 )
             }
 
+            /**
+             * When a user makes a video call after searching for contacts, this function is called.
+             */
             override fun doVideoCall(phoneNumber: String) {
                 addMessage(
                     type = TYPE_CHAT_RECEIVE, content = "You made a video call to $phoneNumber"
                 )
             }
 
+            /**
+             * When a user sends sms with phone number after searching for contacts,
+             * this function is called.
+             */
             override fun sendSmsWithPhoneNumber(phoneNumber: String) {
                 val widgetDesc = JsonObject().apply {
                     this.addProperty(PROPS_WIDGET_DESC, phoneNumber)
@@ -571,29 +663,25 @@ class ChatMainFragment : Fragment(), OnClickListener {
                 )
             }
 
+            /**
+             * When a user picks an image to send to Brain to search or compare similarity,
+             * this function is called.
+             */
             override fun pickImage(isSuccess: Boolean, data: ByteArray?) {
                 if (!isSuccess) addErrorMessage("Fail to pick image")
-                viewModel.uploadImageToFirebase(data!!).observe(viewLifecycleOwner) { resource ->
-                    when (resource) {
-                        is ApiResource.Loading -> {
-                            showLoading(true)
-                        }
 
-                        is ApiResource.Success -> {
-                            showLoading(false)
-                            currentSelectedImage = data
-                            currentUploadedImageName = resource.data
-                            isImagePicked = true
-                        }
-
-                        is ApiResource.Error -> {
-                            addErrorMessage(resource.message!!)
-                            showLoading(false)
-                        }
+                viewModel.uploadImageToFirebase(data!!).observe(viewLifecycleOwner) { resource ->
+                    commonProcessResource(resource) {
+                        currentSelectedImage = data
+                        currentUploadedImageName = resource.data
+                        isImagePicked = true
                     }
                 }
             }
 
+            /**
+             * When a user sets an alarm by using alarm widget, this function is called.
+             */
             override fun setAlarm(hours: Int, minutes: Int, label: String) {
                 addMessage(
                     type = TYPE_CHAT_RECEIVE,
@@ -601,11 +689,64 @@ class ChatMainFragment : Fragment(), OnClickListener {
                 )
             }
 
+            /**
+             * When a user cancels an alarm by using alarm widget, this function is called.
+             */
             override fun cancelAlarm() {
                 addMessage(
                     type = TYPE_CHAT_RECEIVE, content = "You canceled setting an alarm."
                 )
             }
+
+            /**
+             * When a user reads mail by using read mail widget, this function is called.
+             */
+            override fun readMail(from: String, password: String, imap_folder: String) {
+                viewModel.readMails(from, password, imap_folder)
+                    .observe(viewLifecycleOwner) { resource ->
+                        commonProcessResource(resource) {
+                            val props = MailsProps(resource.data!!)
+                            val widgetDesc = JsonObject().apply {
+                                this.addProperty(PROPS_WIDGET_DESC, props.toString())
+                            }
+                            addMessage(
+                                type = TYPE_CHAT_WIDGET,
+                                content = TYPE_WIDGET_MAILS,
+                                data = widgetDesc
+                            )
+                        }
+                    }
+            }
+
+            /**
+             * When a user sends mail by using compose mail widget, this function is called.
+             */
+            override fun sendMail(
+                from: String,
+                password: String,
+                to: String,
+                subject: String,
+                body: String,
+                isInbox: Boolean,
+                filename: String,
+                fileContent: String
+            ) {
+
+                viewModel.sendMail(
+                    sender = from,
+                    pwd = password,
+                    to = to,
+                    subject = subject,
+                    body = body,
+                    to_send = isInbox,
+                    filename = filename,
+                    file_content = fileContent
+                ).observe(viewLifecycleOwner) { resource -> commonProcessResource(resource) {} }
+            }
+
+            override fun readMailInDetail(mail: MailModel) {
+
+            }
         }
     }
 
@@ -616,14 +757,21 @@ class ChatMainFragment : Fragment(), OnClickListener {
             }
 
             R.id.btn_audio_recognition -> {
-
+                //Here are some codes.
             }
         }
     }
 
     override fun onResume() {
         super.onResume()
-        trainImages()
-        trainContacts()
+
+        /**
+         * when main fragment resumes, search for changed images and contacts in mobile and send the changed data
+         * to Brain to train.
+         */
+        viewModel.trainContacts()
+            .observe(viewLifecycleOwner) { resource -> commonProcessResource(resource) {} }
+        viewModel.trainImages()
+            .observe(viewLifecycleOwner) { resource -> commonProcessResource(resource) {} }
     }
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/interfaces/ChatMessageInterface.kt

@@ -1,5 +1,10 @@
 package com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces
 
+import com.matthaigh27.chatgptwrapper.data.models.chat.MailModel
+
+/**
+ * This interface is a callback function that retrieves the results of chat widgets.
+ */
 interface ChatMessageInterface {
     fun sentSms(phoneNumber: String, message: String)
     fun canceledSms()
@@ -9,6 +14,19 @@ interface ChatMessageInterface {
     fun doVideoCall(phoneNumber: String)
     fun sendSmsWithPhoneNumber(phoneNumber: String)
     fun pickImage(isSuccess: Boolean, data: ByteArray? = null)
-    fun setAlarm(hours: Int, minutes:Int, label: String)
+    fun setAlarm(hours: Int, minutes: Int, label: String)
     fun cancelAlarm()
+    fun readMail(from: String, password: String, imap_folder: String)
+    fun sendMail(
+        from: String,
+        password: String,
+        to: String,
+        subject: String,
+        body: String,
+        isInbox: Boolean,
+        filename: String,
+        fileContent: String
+    )
+
+    fun readMailInDetail(mail: MailModel)
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/interfaces/OnHideListener.kt

@@ -1,5 +1,8 @@
 package com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces
 
+/**
+ * This interface is used to retrieve hide event when a user closes chat widgets.
+ */
 interface OnHideListener {
     fun hide()
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/widgets/chatwidget/helpprompt/HelpPromptKeyEditText.kt

@@ -1,44 +0,0 @@
-package com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.helpprompt
-
-import android.annotation.SuppressLint
-import android.content.Context
-import android.view.ViewGroup
-import android.widget.EditText
-import android.widget.LinearLayout
-import androidx.annotation.Dimension
-import com.matthaigh27.chatgptwrapper.R
-
-@SuppressLint("AppCompatCustomView")
-class HelpPromptKeyEditText(context: Context) : EditText(context) {
-    init {
-        val layoutParams: LinearLayout.LayoutParams = LinearLayout.LayoutParams(
-            ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT
-        )
-        val marginBottom =
-            context.resources.getDimensionPixelSize(R.dimen.spacing_tiny)
-        layoutParams.setMargins(0, 0, 0, marginBottom)
-        this.layoutParams = layoutParams
-
-        minHeight =
-            context.resources.getDimensionPixelSize(R.dimen.height_edittext_normal)
-
-        val paddingStart =
-            context.resources.getDimensionPixelSize(R.dimen.spacing_tiny)
-        setPadding(paddingStart, 0, 0, 0)
-
-
-        setTextSize(
-            Dimension.DP,
-            context.resources.getDimensionPixelSize(R.dimen.font_normal)
-                .toFloat()
-        )
-        setTextColor(context.getColor(R.color.color_accent))
-        setHintTextColor(context.getColor(R.color.color_primary_dark))
-        background = context.getDrawable(R.drawable.bg_edittext_radius_small)
-    }
-
-    fun initView(keyName: String) {
-        hint = keyName
-        tag = keyName
-    }
-}

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/widgets/chatwidget/helpprompt/HelpPromptKeyItem.kt

@@ -0,0 +1,30 @@
+package com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.helpprompt
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.view.LayoutInflater
+import android.widget.FrameLayout
+import com.google.android.material.textfield.TextInputLayout
+import com.matthaigh27.chatgptwrapper.R
+
+@SuppressLint("AppCompatCustomView")
+class HelpPromptKeyItem(context: Context) : FrameLayout(context) {
+
+    private val edtKey: TextInputLayout
+
+    init {
+        LayoutInflater.from(context).inflate(R.layout.item_help_prompt_key, this, true)
+
+        edtKey = findViewById(R.id.edt_key)
+    }
+
+    fun initView(keyName: String) {
+        if(keyName.isNotEmpty())
+            edtKey.hint = keyName.subSequence(1, keyName.length)
+        tag = keyName
+    }
+
+    fun getText(): String {
+        return edtKey.editText?.text.toString()
+    }
+}

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/widgets/chatwidget/helpprompt/HelpPromptWidget.kt

@@ -6,6 +6,7 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import android.widget.EditText
+import android.widget.ImageView
 import android.widget.LinearLayout
 import android.widget.TextView
 import androidx.constraintlayout.widget.ConstraintLayout
@@ -19,7 +20,7 @@ class HelpPromptWidget(context: Context, model: HelpPromptModel) : ConstraintLay
     private lateinit var llPromptKeys: LinearLayout
     private lateinit var txtKeysTitle: TextView
 
-    private var promptEditTextList: ArrayList<EditText>? = null
+    private var promptEditTextList: ArrayList<HelpPromptKeyItem>? = null
     private val promptModel: HelpPromptModel
     var callback: ChatMessageInterface? = null
     var hideListener: OnHideListener? = null
@@ -41,8 +42,8 @@ class HelpPromptWidget(context: Context, model: HelpPromptModel) : ConstraintLay
         txtKeysTitle = findViewById(R.id.txt_keys_title)
         txtKeysTitle.text = promptModel.name
 
-        findViewById<Button>(R.id.btn_ok).setOnClickListener(this)
-        findViewById<Button>(R.id.btn_cancel).setOnClickListener(this)
+        findViewById<ImageView>(R.id.btn_ok).setOnClickListener(this)
+        findViewById<ImageView>(R.id.btn_cancel).setOnClickListener(this)
 
         initPromptList()
 
@@ -54,7 +55,7 @@ class HelpPromptWidget(context: Context, model: HelpPromptModel) : ConstraintLay
             promptEditTextList = ArrayList()
 
             for (i in 0 until promptModel.tags.size) {
-                val edtKey = HelpPromptKeyEditText(context)
+                val edtKey = HelpPromptKeyItem(context)
                 edtKey.initView(promptModel.tags[i])
                 llPromptKeys.addView(edtKey)
                 promptEditTextList?.add(edtKey)
@@ -78,7 +79,7 @@ class HelpPromptWidget(context: Context, model: HelpPromptModel) : ConstraintLay
         var promptTemplate = promptModel.prompt
         if(promptModel.tags.size > 0) {
             promptEditTextList?.forEach { edtKeyPrompt ->
-                val prompt = edtKeyPrompt.text.toString()
+                val prompt = edtKeyPrompt.getText()
                 if(prompt.isEmpty()) return
                 promptTemplate = promptTemplate.replace(edtKeyPrompt.tag.toString(), prompt)
             }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/widgets/chatwidget/mail/{compose/ComposeMailWidget.kt → ComposeMailWidget.kt}

@@ -1,18 +1,23 @@
-package com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.mail.compose
+package com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.mail
 
 import android.content.Context
+import android.content.Intent
 import android.util.AttributeSet
 import android.view.KeyEvent
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
+import androidx.appcompat.app.AlertDialog
 import androidx.constraintlayout.widget.ConstraintLayout
+import androidx.core.app.ActivityCompat.startActivityForResult
 import com.google.android.material.chip.Chip
 import com.google.android.material.chip.ChipGroup
+import com.google.android.material.switchmaterial.SwitchMaterial
 import com.google.android.material.textfield.TextInputLayout
 import com.matthaigh27.chatgptwrapper.R
 import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.ChatMessageInterface
+import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.OnHideListener
 import com.matthaigh27.chatgptwrapper.utils.helpers.chat.MailHelper.isGmail
 
 class ComposeMailWidget(
@@ -22,12 +27,19 @@ class ComposeMailWidget(
     private var context: Context
     var callback: ChatMessageInterface? = null
 
+    private var edtMailFrom: TextInputLayout
+    private var edtMailPassword: TextInputLayout
+    private var swhMailType: SwitchMaterial
     private var edtMailTo: TextInputLayout
     private var edtMailSubject: TextInputLayout
     private var edtMailContent: TextInputLayout
     private var mailChipGroup: ChipGroup
     private var attachmentChipGroup: ChipGroup
 
+    var hideListener: OnHideListener? = null
+
+//    private val REQUEST_CODE_LOCAL_STORAGE = 1
+
     init {
         LayoutInflater.from(context).inflate(R.layout.widget_mail_compose, this, true)
         this.context = context
@@ -40,7 +52,6 @@ class ComposeMailWidget(
         this.setOnClickListener(this)
         findViewById<ImageView>(R.id.btn_send).setOnClickListener(this)
         findViewById<ImageView>(R.id.btn_send_cancel).setOnClickListener(this)
-        findViewById<ImageView>(R.id.btn_draft).setOnClickListener(this)
         findViewById<ImageView>(R.id.btn_attachment).setOnClickListener(this)
 
         mailChipGroup = findViewById(R.id.mail_chip_group)
@@ -48,6 +59,9 @@ class ComposeMailWidget(
         edtMailTo = findViewById(R.id.edt_mail_to)
         edtMailSubject = findViewById(R.id.edt_mail_subject)
         edtMailContent = findViewById(R.id.edt_mail_content)
+        edtMailFrom = findViewById(R.id.edt_mail_from)
+        edtMailPassword = findViewById(R.id.edt_mail_password)
+        swhMailType = findViewById(R.id.swh_mail_type)
 
         edtMailTo.editText?.setOnKeyListener(View.OnKeyListener { _, keyCode, event ->
             if (keyCode == KeyEvent.KEYCODE_ENTER && event.action == KeyEvent.ACTION_UP) {
@@ -76,6 +90,64 @@ class ComposeMailWidget(
     }
 
     override fun onClick(view: View?) {
+        when (view?.id) {
+            R.id.btn_send -> {
+                callback?.sendMail(
+                    from = edtMailFrom.editText?.text.toString(),
+                    password = edtMailFrom.editText?.text.toString(),
+                    to = edtMailTo.editText?.text.toString(),
+                    subject = edtMailSubject.editText?.text.toString(),
+                    body = edtMailContent.editText?.text.toString(),
+                    isInbox = swhMailType.isChecked,
+                    filename = "",
+                    fileContent = "",
+                )
+            }
+
+            R.id.btn_cancel -> {
+                hideListener?.hide()
+            }
 
+            R.id.btn_attachment -> {
+//                val choice = arrayOf("Local Storage", "Google Drive")
+//                val builder = AlertDialog.Builder(context)
+//                builder.setItems(choice) { dialog, which ->
+//                    when (which) {
+//                        0 -> selectFileFromLocalStorage()
+//                        1 -> selectFileFromGoogleDrive()
+//                    }
+//                }
+//                builder.show()
+            }
+        }
     }
+
+//    fun selectFileFromLocalStorage() {
+//        val intent = Intent(Intent.ACTION_GET_CONTENT)
+//        intent.type = "*/*"
+//        startActivityForResult(intent, REQUEST_CODE_LOCAL_STORAGE)
+//    }
+//
+//    fun selectFileFromGoogleDrive() {
+//        val intent = driveClient.newOpenFileActivityIntentBuilder()
+//            .setMimeType(new String[] {"text/plain"})
+//            .build();
+//        startActivityForResult(intent, REQUEST_CODE_GOOGLE_DRIVE);
+//    }
+//
+//    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+//        super.onActivityResult(requestCode, resultCode, data)
+//        if (requestCode == REQUEST_CODE_LOCAL_STORAGE && resultCode == Activity.RESULT_OK && data != null) {
+//            fileName = data.data
+//        }
+//    }
+//
+//    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+//        super.onActivityResult(requestCode, resultCode, data)
+//        // handle onActivityResult for local storage
+//        if (requestCode == REQUEST_CODE_GOOGLE_DRIVE && resultCode == Activity.RESULT_OK && data != null) {
+//            val driveId = data.getParcelableExtra<DriveId>(OpenFileActivityOptions.EXTRA_RESPONSE_DRIVE_ID);
+//            // use this driveId to handle file
+//        }
+//    }
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/widgets/chatwidget/mail/MailWidget.kt

@@ -5,31 +5,42 @@ import android.util.AttributeSet
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.TextView
 import androidx.constraintlayout.widget.ConstraintLayout
 import com.matthaigh27.chatgptwrapper.R
+import com.matthaigh27.chatgptwrapper.data.models.chat.MailModel
 import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.ChatMessageInterface
 
 
 class MailWidget(
-    context: Context, attrs: AttributeSet? = null
+    private val context: Context, private val mail: MailModel, attrs: AttributeSet? = null
 ) : ConstraintLayout(context, attrs), View.OnClickListener {
 
-    private var context: Context
     var callback: ChatMessageInterface? = null
 
+    private val txtTitle:TextView
+    private val txtContent: TextView
+    private val txtDate: TextView
+
     init {
         LayoutInflater.from(context).inflate(R.layout.widget_mail, this, true)
-        this.context = context
 
         layoutParams = LayoutParams(
-            ViewGroup.LayoutParams.WRAP_CONTENT,
-            ViewGroup.LayoutParams.WRAP_CONTENT
+            ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT
         )
 
+        txtTitle = findViewById(R.id.txt_title)
+        txtContent = findViewById(R.id.txt_content)
+        txtDate = findViewById(R.id.txt_date)
+
+        txtTitle.text = mail.subject
+        txtContent.text = mail.body
+        txtDate.text = mail.date
+
         this.setOnClickListener(this)
     }
 
     override fun onClick(view: View?) {
-
+        callback?.readMailInDetail(mail)
     }
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/view/widgets/chatwidget/mail/ReadMailWidget.kt

@@ -0,0 +1,67 @@
+package com.matthaigh27.chatgptwrapper.ui.chat.view.widgets.chatwidget.mail
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.ImageView
+import androidx.constraintlayout.widget.ConstraintLayout
+import com.google.android.material.switchmaterial.SwitchMaterial
+import com.google.android.material.textfield.TextInputLayout
+import com.matthaigh27.chatgptwrapper.R
+import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.ChatMessageInterface
+import com.matthaigh27.chatgptwrapper.ui.chat.view.interfaces.OnHideListener
+
+class ReadMailWidget(
+    context: Context, attrs: AttributeSet? = null
+) : ConstraintLayout(context, attrs), View.OnClickListener {
+
+    private var context: Context
+    var callback: ChatMessageInterface? = null
+
+    private var edtMailFrom: TextInputLayout
+    private var edtMailPassword: TextInputLayout
+    private var swhMailType: SwitchMaterial
+
+    var hideListener: OnHideListener? = null
+
+    init {
+        LayoutInflater.from(context).inflate(R.layout.widget_mail_read, this, true)
+        this.context = context
+
+        layoutParams = LayoutParams(
+            ViewGroup.LayoutParams.MATCH_PARENT,
+            ViewGroup.LayoutParams.WRAP_CONTENT
+        )
+
+        this.setOnClickListener(this)
+        findViewById<ImageView>(R.id.btn_send).setOnClickListener(this)
+        findViewById<ImageView>(R.id.btn_send_cancel).setOnClickListener(this)
+
+        edtMailFrom = findViewById(R.id.edt_mail_from)
+        edtMailPassword = findViewById(R.id.edt_mail_password)
+        swhMailType = findViewById(R.id.swh_mail_type)
+    }
+
+    override fun onClick(view: View?) {
+        when (view?.id) {
+            R.id.btn_send -> {
+                val from  = edtMailFrom.editText?.text.toString()
+                val password = edtMailPassword.editText?.text.toString()
+                if(from == "" || password == "") return
+                val imapFolder = if (swhMailType.isChecked) "inbox" else "draft"
+                callback?.readMail(
+                    from = edtMailFrom.editText?.text.toString(),
+                    password = edtMailPassword.editText?.text.toString(),
+                    imap_folder = imapFolder
+                )
+            }
+
+            R.id.btn_cancel -> {
+                hideListener?.hide()
+            }
+        }
+        hideListener?.hide()
+    }
+}

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/chat/viewmodel/ChatViewModel.kt

@@ -13,9 +13,14 @@ import com.matthaigh27.chatgptwrapper.RisingApplication.Companion.appContext
 import com.matthaigh27.chatgptwrapper.data.local.entity.ImageEntity
 import com.matthaigh27.chatgptwrapper.data.models.chat.AutoTaskModel
 import com.matthaigh27.chatgptwrapper.data.models.chat.ImageRelatenessModel
+import com.matthaigh27.chatgptwrapper.data.models.chat.MailModel
 import com.matthaigh27.chatgptwrapper.data.remote.ApiResource
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ComposeMailApiRequest
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ComposeMailData
 import com.matthaigh27.chatgptwrapper.data.remote.requests.ImageRelatednessApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.NotificationApiRequest
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ReadMailApiRequest
+import com.matthaigh27.chatgptwrapper.data.remote.requests.ReadMailData
 import com.matthaigh27.chatgptwrapper.data.remote.requests.TrainContactsApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.requests.TrainImageApiRequest
 import com.matthaigh27.chatgptwrapper.data.remote.responses.ApiResponse
@@ -40,6 +45,9 @@ import kotlinx.coroutines.withContext
 
 class ChatViewModel : ViewModel() {
 
+    /**
+     * This function is used to fetch all help commands from Brain.
+     */
     fun getAllHelpCommands(): MutableLiveData<ApiResource<ApiResponse<HelpCommandResult>>> {
         val resource: MutableLiveData<ApiResource<ApiResponse<HelpCommandResult>>> =
             MutableLiveData()
@@ -54,6 +62,9 @@ class ChatViewModel : ViewModel() {
         return resource
     }
 
+    /**
+     * This function is used to send user's message to Brain to analyze the user's query.
+     */
     fun sendNotification(message: String): MutableLiveData<ApiResource<ApiResponse<CommonResult>>> {
         val request = NotificationApiRequest(
             message = message, confs = RemoteRepository.getKeys()
@@ -71,6 +82,11 @@ class ChatViewModel : ViewModel() {
         return resource
     }
 
+    /**
+     * This function is used to download image from Firebase Storage.
+     *
+     * @param name An image name that is stored in Firebase storage
+     */
     fun downloadImageFromFirebase(name: String): MutableLiveData<ApiResource<ByteArray>> {
         val resource: MutableLiveData<ApiResource<ByteArray>> = MutableLiveData()
         resource.value = ApiResource.Loading()
@@ -84,6 +100,12 @@ class ChatViewModel : ViewModel() {
         return resource
     }
 
+    /**
+     * This function is used to upload image to Firebase storage and return uuid of uploaded image name.
+     *
+     * @param imageByteArray A bytearray of image to upload
+     * @return A uuid that is generated to keep unique when the image is uploaded.
+     */
     fun uploadImageToFirebase(imageByteArray: ByteArray): MutableLiveData<ApiResource<String>> {
         val resource: MutableLiveData<ApiResource<String>> = MutableLiveData()
         resource.value = ApiResource.Loading()
@@ -97,11 +119,22 @@ class ChatViewModel : ViewModel() {
         return resource
     }
 
+    /**
+     * This function is used to train changed images in user's mobile local storage.
+     */
     fun trainImages(): MutableLiveData<ApiResource<Int>> {
         val state: MutableLiveData<ApiResource<Int>> = MutableLiveData()
         state.value = ApiResource.Loading()
         CoroutineScope(Dispatchers.IO).launch {
+            /**
+             * Get images from external storage
+             */
             val images = getImagesFromExternalStorage(appContext.contentResolver)
+
+            /**
+             * Get images from room database, in which previous images are stores so we can find changed
+             * images by comparing the two image array data.
+             */
             val originalImages = RoomRepository.getAllImages().value
 
             val existImageStatus = BooleanArray(originalImages!!.size) { false }
@@ -113,6 +146,10 @@ class ChatViewModel : ViewModel() {
                 for (i in originalImages.indices) {
                     val entity: ImageEntity = originalImages[i]
                     if (entity.path == path) {
+                        /**
+                         * If path of images is same and modified date of images is different,
+                         * update the image in Room database and send update request to Brain.
+                         */
                         if (entity.dataModified != image.modifiedDate) {
                             val byteArray = getBytesFromPath(path)
                             val task = async {
@@ -136,10 +173,18 @@ class ChatViewModel : ViewModel() {
                             tasks.add(task)
                         }
                         isExist = true
+                        /**
+                         * Indexes of existed images are stored in below BooleanArray variable so that
+                         * after this loop, it is possible to search for new images that created in local storage.
+                         */
                         existImageStatus[i] = true
                         break
                     }
                 }
+
+                /**
+                 * New images are inserted into Room database and send create request to Brain.
+                 */
                 if (!isExist) {
                     path?.let {
                         val byteArray = getBytesFromPath(it)
@@ -166,6 +211,9 @@ class ChatViewModel : ViewModel() {
                 }
             }
 
+            /**
+             * Images that doesn't exist in existImageStatus BooleanArray are deleted from database.
+             */
             for (i in existImageStatus.indices) {
                 if (!existImageStatus[i]) {
                     val task = async {
@@ -185,7 +233,6 @@ class ChatViewModel : ViewModel() {
             }
 
             tasks.awaitAll()
-            Log.d("Brain", "Finish")
             withContext(Dispatchers.Main) {
                 state.value = ApiResource.Success(0)
             }
@@ -193,13 +240,28 @@ class ChatViewModel : ViewModel() {
         return state
     }
 
+    /**
+     * This function is used to train changed contacts.
+     */
     fun trainContacts(): MutableLiveData<ApiResource<ApiResponse<String>>> {
         val state: MutableLiveData<ApiResource<ApiResponse<String>>> = MutableLiveData()
         state.value = ApiResource.Loading()
+        /**
+         * Get current contacts from user's phone
+         */
         val contacts = getContacts(appContext)
         CoroutineScope(Dispatchers.Main).launch {
             val resource: MutableLiveData<Boolean> = MutableLiveData()
+
+            /**
+             * Get changed contacts
+             */
             val changedContacts = getChangedContacts(contacts)
+
+            /**
+             * Send request to Server
+             *
+             */
             val request = TrainContactsApiRequest(changedContacts, RemoteRepository.getKeys())
             withContext(Dispatchers.Main) {
                 RemoteRepository.trainContacts(request, onSuccess = { apiResponse ->
@@ -212,6 +274,9 @@ class ChatViewModel : ViewModel() {
         return state
     }
 
+    /**
+     * This function is used to get similar image to one that a user uploaded.
+     */
     fun getImageRelatedness(
         imageName: String,
         message: String
@@ -223,16 +288,23 @@ class ChatViewModel : ViewModel() {
         )
         resource.value = ApiResource.Loading()
 
+        /**
+         * Get the uuid of the similar image
+         */
         RemoteRepository.getImageRelatedness(request, onSuccess = { apiResponse ->
             val resultImageName = apiResponse.result.content.image_name
             val resultImageDesc = apiResponse.result.content.image_desc
 
+            /**
+             * With the uuid of the image, download the image data from Firebase Storage
+             */
             FirebaseRepository.downloadImageWithName(
                 name = resultImageName,
                 onSuccess = { response ->
                     resource.value =
                         ApiResource.Success(ImageRelatenessModel(response, resultImageDesc))
-                }, onFailure = { throwable ->
+                },
+                onFailure = { throwable ->
                     resource.value = ApiResource.Error(throwable)
                 }
             )
@@ -243,6 +315,74 @@ class ChatViewModel : ViewModel() {
         return resource
     }
 
+    /**
+     * This function is used to read mails
+     */
+    fun readMails(
+        from: String,
+        password: String,
+        imapFolder: String
+    ): MutableLiveData<ApiResource<ArrayList<MailModel>>> {
+        val resource: MutableLiveData<ApiResource<ArrayList<MailModel>>> =
+            MutableLiveData()
+        val request = ReadMailApiRequest(
+            data = ReadMailData(
+                sender = from,
+                pwd = password,
+                imap_folder = imapFolder
+            ), confs = RemoteRepository.getKeys()
+        )
+        resource.value = ApiResource.Loading()
+
+        RemoteRepository.readEmails(request, onSuccess = { apiResponse ->
+            resource.value =
+                ApiResource.Success(apiResponse.result)
+        }, onFailure = { throwable ->
+            resource.value = ApiResource.Error(throwable)
+        })
+
+        return resource
+    }
+
+    /**
+     * this function is used to send mails
+     */
+    fun sendMail(
+        sender: String,
+        pwd: String,
+        to: String,
+        subject: String,
+        body: String,
+        to_send: Boolean,
+        filename: String,
+        file_content: String
+    ): MutableLiveData<ApiResource<String>> {
+        val resource: MutableLiveData<ApiResource<String>> =
+            MutableLiveData()
+        val request = ComposeMailApiRequest(
+            data = ComposeMailData(
+                sender = sender,
+                pwd = pwd,
+                to = to,
+                subject = subject,
+                body = body,
+                to_send = to_send,
+                filename = filename,
+                file_content = file_content
+            ), confs = RemoteRepository.getKeys()
+        )
+        resource.value = ApiResource.Loading()
+
+        RemoteRepository.sendEmail(request, onSuccess = { apiResponse ->
+            resource.value =
+                ApiResource.Success(apiResponse.result)
+        }, onFailure = { throwable ->
+            resource.value = ApiResource.Error(throwable)
+        })
+
+        return resource
+    }
+
     /**
      * This function is used to retrieve real-time data for the auto task.
      * Whenever data in the Firebase real-time database changes,
@@ -260,7 +400,7 @@ class ChatViewModel : ViewModel() {
                         val data = snapshot.getValue<AutoTaskModel>()
                         data?.let {
                             data.command?.let { command ->
-                                if(command.name == "finish") {
+                                if (command.name == "finish") {
                                     resource.value = ApiResource.Success(data)
                                 } else {
                                     resource.value = ApiResource.Loading(data)
@@ -285,7 +425,7 @@ class ChatViewModel : ViewModel() {
                         val data = snapshot.getValue<AutoTaskModel>()
                         data?.let {
                             data.command?.let { command ->
-                                if(command.name == "finish") {
+                                if (command.name == "finish") {
                                     resource.value = ApiResource.Success(data)
                                 } else {
                                     resource.value = ApiResource.Loading(data)

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/setting/viewmodel/SettingViewModel.kt

@@ -7,6 +7,11 @@ import com.matthaigh27.chatgptwrapper.data.remote.ApiResource
 import com.matthaigh27.chatgptwrapper.data.repository.SharedPreferencesRepository
 
 class SettingViewModel : ViewModel() {
+    /**
+     * By using SharedPreferences, keys to configure backend are stored and retrieved.
+     *
+     * This function is used to set the keys.
+     */
     fun setSettingData(model: SettingModel): MutableLiveData<ApiResource<Boolean>> {
         val state: MutableLiveData<ApiResource<Boolean>> = MutableLiveData()
         state.value = ApiResource.Loading()
@@ -15,6 +20,9 @@ class SettingViewModel : ViewModel() {
         return state
     }
 
+    /**
+     * This function is used to get the keys.
+     */
     fun getSettingData(): MutableLiveData<ApiResource<SettingModel>> {
         val state: MutableLiveData<ApiResource<SettingModel>> = MutableLiveData()
         state.value = ApiResource.Loading()

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/ui/splash/SplashActivity.kt

@@ -0,0 +1,133 @@
+package com.matthaigh27.chatgptwrapper.ui.splash
+
+import android.Manifest
+import android.annotation.SuppressLint
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.os.Build
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.os.Handler
+import com.matthaigh27.chatgptwrapper.R
+import com.matthaigh27.chatgptwrapper.ui.base.BaseActivity
+import com.matthaigh27.chatgptwrapper.ui.chat.view.ChatActivity
+import com.matthaigh27.chatgptwrapper.ui.chat.view.dialogs.ConfirmDialog
+import com.matthaigh27.chatgptwrapper.ui.chat.view.fragments.ChatMainFragment
+
+/**
+ * An Activity class for splash screen
+ *
+ * This class not only shows splash screen, but send permission requests to users.
+ */
+class SplashActivity : BaseActivity() {
+
+    private val PERMISSIONS_REQUEST_CODE = 1
+    private val SPLASH_DELAY_TIME = 3500L
+    /**
+     * This is string array variable to store a list of permissions to send to users.
+     */
+    private lateinit var permissions: Array<String>
+    /**
+     * This is string variable to present warning when users didn't accept all given permissions.
+     */
+    private lateinit var confirmMessage: String
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_splash)
+
+        requestPermissions()
+        confirmMessage = getString(R.string.message_confirm_permission)
+    }
+
+    /**
+     * Send permission requests to users.
+     *
+     * This function is used to send permission requests to users for the normal operation of our app.
+     * If you refuse even one request, confirm dialog that recommend users to accept the refused requests again
+     * are showed.
+     */
+    private fun requestPermissions() {
+        /**
+         * In mobile phones that use Google API 33 or higher, the permission for reading external storage
+         * is disabled because the phones don't support the feature.
+         */
+        permissions = if(Build.VERSION.SDK_INT > Build.VERSION_CODES.S_V2) {
+            arrayOf(
+                Manifest.permission.SEND_SMS,
+                Manifest.permission.READ_CONTACTS,
+                Manifest.permission.CALL_PHONE
+            )
+        } else {
+            arrayOf(
+                Manifest.permission.SEND_SMS,
+                Manifest.permission.READ_CONTACTS,
+                Manifest.permission.CALL_PHONE,
+                Manifest.permission.READ_EXTERNAL_STORAGE
+            )
+        }
+        val notGrantedPermissions = permissions.filter {
+            checkSelfPermission(it) != PackageManager.PERMISSION_GRANTED
+        }
+
+
+        if (notGrantedPermissions.isNotEmpty()) {
+            /**
+             * If some permissions that users didn't accept exist, this code block are executed.
+             */
+            if (shouldShowRequestPermissionRationale(notGrantedPermissions[0])) {
+                // show custom permission rationale
+                val confirmDialog = ConfirmDialog(this@SplashActivity)
+                confirmDialog.setOnClickListener(object :
+                    ConfirmDialog.OnDialogButtonClickListener {
+                    override fun onPositiveButtonClick() {
+                        requestPermissions(
+                            notGrantedPermissions.toTypedArray(), PERMISSIONS_REQUEST_CODE
+                        )
+                    }
+
+                    override fun onNegativeButtonClick() {
+                        finish()
+                    }
+                })
+
+                confirmDialog.show()
+                confirmDialog.setMessage(confirmMessage)
+
+            } else {
+                requestPermissions(notGrantedPermissions.toTypedArray(), PERMISSIONS_REQUEST_CODE)
+            }
+        } else {
+            /**
+             * Permissions already granted, navigate to your desired activity
+             */
+            moveToChatActivity()
+        }
+    }
+
+    @SuppressLint("MissingSuperCall")
+    override fun onRequestPermissionsResult(
+        requestCode: Int, permissions: Array<out String>, grantResults: IntArray
+    ) {
+        when (requestCode) {
+            PERMISSIONS_REQUEST_CODE -> {
+                if (grantResults.all { it == PackageManager.PERMISSION_GRANTED }) {
+                    /**
+                     * Permissions granted, navigate to your desired activity
+                     */
+                    moveToChatActivity()
+                } else {
+                    requestPermissions()
+                }
+                return
+            }
+        }
+    }
+
+    private fun moveToChatActivity() {
+        Handler().postDelayed({
+            startActivity(Intent(this@SplashActivity, ChatActivity::class.java))
+        }, SPLASH_DELAY_TIME)
+    }
+}

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/utils/constants/CommonConstants.kt

@@ -13,11 +13,7 @@ object CommonConstants {
 
     val ERROR_MSG_JSON = "Json Parsing Error"
     val ERROR_MSG_NOEXIST_COMMAND = "No such command name exists."
+    val ERROR_MSG_UNKNOWN_ERROR = "Unknown Error happened"
 
     val PROPS_WIDGET_DESC = "widget description"
-
-    val TIME_OUT_CALL = 60L
-    val TIME_OUT_CONNECT = 60L
-    val TIME_OUT_READ = 60L
-    val TIME_OUT_WRITE = 60L
 }

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/utils/constants/TypeChatWidgetConstants.kt

@@ -6,6 +6,7 @@ object TypeChatWidgetConstants {
     val TYPE_WIDGET_FEEDBACK = "feedback"
     val TYPE_WIDGET_SEARCH_CONTACT = "search_contact"
     val TYPE_WIDGET_SCHEDULE_ALARM = "schedule_alarm"
+    val TYPE_WIDGET_MAILS = "mails"
     val TYPE_WIDGET_MAIL_READ = "mail_read"
     val TYPE_WIDGET_MAIL_WRITE = "mail_write"
     val TYPE_WIDGET_MAIL_SEND = "mail_send"

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/utils/constants/TypeResponseConstants.kt

@@ -10,7 +10,7 @@ object TypeResponseConstants {
     val TYPE_RESPONSE_SMS = "sms"
     val TYPE_RESPONSE_ALARM = "alarm"
     val TYPE_RESPONSE_CONTACT = "contact"
-    val TYPE_RESPONSE_MAIL_READ = "reademail"
+    val TYPE_RESPONSE_MAIL_READ = "reademails"
     val TYPE_RESPONSE_MAIL_WRITE = "writeemail"
     val TYPE_RESPONSE_MAIL_SEND = "sendemail"
     val TYPE_RESPONSE_AUTO_TASK = "autotask"

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/utils/helpers/chat/AlarmHelper.kt

@@ -11,6 +11,10 @@ import java.util.Calendar
 
 
 object AlarmHelper {
+
+    /**
+     * This function is used to set an alarm with time and label
+     */
     fun createAlarm(context: Context, hour: Int, minute: Int, label: String) {
         val calendar = Calendar.getInstance()
 

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/utils/helpers/chat/CommandHelper.kt

@@ -8,10 +8,16 @@ import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.HELP_COMMA
 import com.matthaigh27.chatgptwrapper.utils.constants.CommonConstants.HELP_COMMAND_ERROR_NO_MAIN
 
 object CommandHelper {
+    /**
+     * This function is used to identify whether helpcommand model is main help command.
+     */
     fun isMainHelpCommand(model: HelpCommandModel): Boolean {
         return model.main != HELP_COMMAND
     }
 
+    /**
+     * This function is used to convert user's help prompt to HelpCommandModel.
+     */
     fun getHelpCommandFromStr(strCommand: String): HelpCommandModel {
         val commandModel = HelpCommandModel()
         if (strCommand == "/$HELP_COMMAND") {
@@ -39,6 +45,9 @@ object CommandHelper {
         return commandModel
     }
 
+    /**
+     * This function is used to make usage of all prompts to be showed to users with a list of Help Prompt Models.
+     */
     fun makePromptUsage(list: ArrayList<HelpPromptModel>) : String {
         val usage = "usage:\n" +
                 "- help command: /help [command name]\n" +
@@ -51,6 +60,9 @@ object CommandHelper {
         return strHelpList
     }
 
+    /**
+     * This function is used to make usage of given prompt.
+     */
     fun makePromptItemUsage(list: ArrayList<HelpPromptModel>, assistName: String): String {
         var strHelpDesc = ""
         list.forEach { model ->

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/utils/helpers/chat/ContactHelper.kt

@@ -12,6 +12,9 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.async
 
 object ContactHelper {
+    /**
+     * This function is used to get contacts from user's phone.
+     */
     @SuppressLint("Range")
     fun getContacts(context: Context): ArrayList<ContactModel> {
         val resolver: ContentResolver = context.contentResolver;
@@ -61,6 +64,11 @@ object ContactHelper {
         return contacts
     }
 
+    /**
+     * This function is used to get changed contacts by comparing images from user's contacts and
+     * ones from room database. After comparing, contacts table in room database is updated with the changed
+     * contacts.
+     */
     suspend fun getChangedContacts(
         contacts: ArrayList<ContactModel>
     ): ArrayList<ContactModel> {
@@ -133,6 +141,9 @@ object ContactHelper {
         }.await()
     }
 
+    /**
+     * This function is used to get contact model by id from user's current contacts.
+     */
     fun getContactModelById(contactId: String, contacts: ArrayList<ContactModel>): ContactModel {
         var contactModel = ContactModel()
         val searchResults = contacts.filter { contact ->

Android/app/src/main/java/com/matthaigh27/chatgptwrapper/utils/helpers/chat/ImageHelper.kt

@@ -27,6 +27,9 @@ import java.util.Date
 import java.util.Locale
 
 object ImageHelper {
+    /**
+     * This function is used to save images with name generated by current date.
+     */
     fun createSDCardFile(): File {
         val timeStamp: String =
             SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(Date())
@@ -40,6 +43,9 @@ object ImageHelper {
         )
     }
 
+    /**
+     * This function is used to convert files to ByteArray data.
+     */
     @Suppress("UNREACHABLE_CODE")
     fun getBytesFromPath(path: String): ByteArray {
         val byteArray: ByteArray
@@ -54,6 +60,9 @@ object ImageHelper {
         return byteArray
     }
 
+    /**
+     * This function is used to convert image to ByteArray data with its Uri.
+     */
     fun convertImageToByte(uri: Uri): ByteArray? {
         val data: ByteArray
         try {
@@ -69,6 +78,13 @@ object ImageHelper {
         return data
     }
 
+    /**
+     * This function is used to convert rectangle image to rounded image.
+     *
+     * @param bitmap A bitmap to convert
+     * @param pixels A round size of image to convert
+     * @return A rounded bitmap
+     */
     fun getRoundedCornerBitmap(bitmap: Bitmap, pixels: Int): Bitmap? {
         val output = Bitmap.createBitmap(bitmap.width, bitmap.height, Bitmap.Config.ARGB_8888)
         val canvas = Canvas(output)
@@ -86,6 +102,10 @@ object ImageHelper {
         return output
     }
 
+    /**
+     * This function is used to get images from external storage.
+     * First, get images with its path and modified date and then convert to ImageModel
+     */
     fun getImagesFromExternalStorage(contentResolver: ContentResolver): ArrayList<ImageModel> {
         val listOfImages = ArrayList<ImageModel>()
 
@@ -112,6 +132,9 @@ object ImageHelper {
         return listOfImages
     }
 
+    /**
+     * This function is used to get local path from Uri of image.
+     */
     fun getLocalPathFromUri(context: Context, contentUri: Uri?): String? {
         var cursor: Cursor? = null
         return try {

Android/app/src/main/res/layout/activity_chat.xml

@@ -1,16 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/fl_container"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:animateLayoutChanges="true"
     android:background="@color/color_primary_dark"
-    tools:context=".ui.chat.view.ChatActivity">
-
-    <FrameLayout
-        android:id="@+id/fl_container"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent" />
-
-</androidx.constraintlayout.widget.ConstraintLayout>
+    tools:context=".ui.chat.view.ChatActivity" />

Android/app/src/main/res/layout/activity_splash.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".ui.splash.SplashActivity"
+    android:background="@color/bg_color_splash_screen" >
+
+    <ImageView
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:src="@drawable/image_logo"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintWidth_percent="0.9"/>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

Android/app/src/main/res/layout/item_help_prompt_key.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+    <com.google.android.material.textfield.TextInputLayout
+        android:id="@+id/edt_key"
+        style="@style/CommonEditText"
+        android:layout_marginBottom="@dimen/spacing_tiny">
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+
+    </com.google.android.material.textfield.TextInputLayout>
+</FrameLayout>

Android/app/src/main/res/layout/widget_help_prompt.xml

@@ -16,7 +16,7 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent">
 
-        <androidx.constraintlayout.widget.ConstraintLayout
+        <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"
@@ -24,16 +24,50 @@
             android:paddingTop="@dimen/spacing_normal"
             android:paddingBottom="@dimen/spacing_tiny">
 
-            <TextView
-                android:id="@+id/txt_keys_title"
+            <androidx.constraintlayout.widget.ConstraintLayout
+                android:id="@+id/cl_header"
                 android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:layout_marginStart="@dimen/spacing_tiny"
-                android:text="@string/title_chat_widget"
-                android:textColor="@color/color_accent"
-                android:textSize="@dimen/font_big"
-                android:textStyle="bold"
-                app:layout_constraintTop_toTopOf="parent" />
+                android:layout_height="wrap_content">
+
+                <TextView
+                    android:id="@+id/txt_keys_title"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:text="@string/title_chat_widget"
+                    android:textColor="@color/color_accent"
+                    android:textSize="@dimen/font_big"
+                    android:textStyle="bold"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent" />
+
+                <ImageView
+                    android:id="@+id/btn_ok"
+                    android:layout_width="@dimen/size_button_normal"
+                    android:layout_height="@dimen/size_button_normal"
+                    android:padding="@dimen/spacing_tiny"
+                    android:src="@drawable/ic_send"
+                    app:layout_constraintBottom_toBottomOf="@+id/txt_keys_title"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintTop_toTopOf="@+id/txt_keys_title"
+                    app:tint="@color/color_accent" />
+
+                <ImageView
+                    android:id="@+id/btn_cancel"
+                    android:layout_width="@dimen/size_button_normal"
+                    android:layout_height="@dimen/size_button_normal"
+                    android:padding="@dimen/spacing_tiny"
+                    android:src="@drawable/ic_cancel_schedule_send"
+                    app:layout_constraintBottom_toBottomOf="@+id/txt_keys_title"
+                    app:layout_constraintEnd_toStartOf="@+id/btn_ok"
+                    app:layout_constraintTop_toTopOf="@+id/txt_keys_title"
+                    app:tint="@color/color_accent" />
+
+            </androidx.constraintlayout.widget.ConstraintLayout>
+
+            <View
+                style="@style/HorizontalDividerStyle"
+                android:layout_marginVertical="@dimen/spacing_tiny" />
 
             <LinearLayout
                 android:id="@+id/ll_prompt_keys"
@@ -43,26 +77,7 @@
                 android:orientation="vertical"
                 app:layout_constraintTop_toBottomOf="@+id/txt_keys_title" />
 
-            <LinearLayout
-                android:id="@+id/linearLayout"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="@dimen/spacing_small"
-                android:gravity="end"
-                app:layout_constraintTop_toBottomOf="@+id/ll_prompt_keys">
-
-                <Button
-                    android:id="@+id/btn_ok"
-                    style="@style/ChatWidgetCommonButton"
-                    android:text="@string/text_button_ok" />
-
-                <Button
-                    android:id="@+id/btn_cancel"
-                    style="@style/ChatWidgetCommonButton"
-                    android:text="@string/text_button_cancel" />
-            </LinearLayout>
-
-        </androidx.constraintlayout.widget.ConstraintLayout>
+        </LinearLayout>
     </androidx.cardview.widget.CardView>
 
 </androidx.constraintlayout.widget.ConstraintLayout>