/*
 * Copyright (C) 2014-2021 Arpit Khurana <arpitkh96@gmail.com>, Vishal Nehra <vishalmeham2@gmail.com>,
 * Emmanuel Messulam<emmanuelbendavid@gmail.com>, Raymond Lai <airwave209gt at gmail.com> and Contributors.
 *
 * This file is part of Amaze File Manager.
 *
 * Amaze File Manager is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.amaze.filemanager.asynchronous.services

import android.content.Context
import android.net.ConnectivityManager
import android.net.NetworkInfo
import android.net.Uri
import android.net.wifi.WifiInfo
import android.net.wifi.WifiManager
import android.os.Build.VERSION_CODES.LOLLIPOP
import android.os.Environment
import androidx.preference.PreferenceManager
import androidx.test.core.app.ApplicationProvider
import androidx.test.ext.junit.runners.AndroidJUnit4
import com.amaze.filemanager.asynchronous.services.ftp.FtpService
import com.amaze.filemanager.filesystem.ftpserver.AndroidFileSystemFactory
import com.amaze.filemanager.shadows.ShadowMultiDex
import org.apache.commons.net.ftp.FTPClient
import org.apache.ftpserver.ConnectionConfigFactory
import org.apache.ftpserver.FtpServer
import org.apache.ftpserver.FtpServerFactory
import org.apache.ftpserver.listener.ListenerFactory
import org.apache.ftpserver.usermanager.impl.BaseUser
import org.junit.After
import org.junit.Assert.assertEquals
import org.junit.Assert.assertFalse
import org.junit.Assert.assertNotNull
import org.junit.Assert.assertNull
import org.junit.Assert.assertTrue
import org.junit.Before
import org.junit.Ignore
import org.junit.Test
import org.junit.runner.RunWith
import org.robolectric.Shadows.shadowOf
import org.robolectric.annotation.Config
import org.robolectric.annotation.LooperMode
import org.robolectric.shadows.ShadowNetworkInfo
import org.robolectric.util.ReflectionHelpers
import java.io.ByteArrayInputStream
import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import java.net.InetAddress
import kotlin.random.Random

@Ignore("Pending fix for testing against newer Androids")
@RunWith(AndroidJUnit4::class)
@Config(sdk = [LOLLIPOP], shadows = [ShadowMultiDex::class])
@LooperMode(LooperMode.Mode.PAUSED)
@Suppress("StringLiteralDuplication")
class FtpServiceAndroidFileSystemIntegrationTest {
    private val FTP_PORT = 62222

    private var server: FtpServer? = null

    private val randomContent = Random.nextBytes(16)

    private var ftpClient: FTPClient? = null

    companion object {
        val directories =
            arrayOf(
                Environment.DIRECTORY_MUSIC,
                Environment.DIRECTORY_PODCASTS,
                Environment.DIRECTORY_RINGTONES,
                Environment.DIRECTORY_ALARMS,
                Environment.DIRECTORY_NOTIFICATIONS,
                Environment.DIRECTORY_PICTURES,
                Environment.DIRECTORY_MOVIES,
                Environment.DIRECTORY_DOWNLOADS,
                Environment.DIRECTORY_DCIM,
                Environment.DIRECTORY_DOCUMENTS,
                "1/2/3/4/5/6/7",
                "lost+found",
            )
    }

    /**
     * Test setup
     */
    @Before
    fun setUp() {
        Environment.getExternalStorageDirectory().run {
            directories.forEach { dir ->
                File(this, dir).mkdirs()
            }
        }

        setupNetwork()
        PreferenceManager.getDefaultSharedPreferences(ApplicationProvider.getApplicationContext())
            .run {
                edit().putString(
                    FtpService.KEY_PREFERENCE_PATH,
                    Environment.getExternalStorageDirectory().absolutePath,
                )
                    .apply()
            }

        File(Environment.getExternalStorageDirectory(), "test.bin").let { file ->
            file.writeBytes(randomContent)
            shadowOf(ApplicationProvider.getApplicationContext<Context>().contentResolver)
                .registerInputStream(Uri.fromFile(file), FileInputStream(file))
        }

        FtpServerFactory().run {
            val connectionConfigFactory = ConnectionConfigFactory()
            val user = BaseUser()
            user.name = "anonymous"
            user.homeDirectory = Environment.getExternalStorageDirectory().absolutePath
            connectionConfigFactory.isAnonymousLoginEnabled = true
            connectionConfig = connectionConfigFactory.createConnectionConfig()
            userManager.save(user)

            fileSystem =
                AndroidFileSystemFactory(
                    ApplicationProvider.getApplicationContext(),
                )
            addListener(
                "default",
                ListenerFactory().also {
                    it.port = FTP_PORT
                }.createListener(),
            )

            server =
                createServer().apply {
                    start()
                }
        }

        ftpClient =
            FTPClient().also {
                it.connect("127.0.0.1", FTP_PORT)
                it.login("anonymous", "no@e.mail")
                it.enterLocalPassiveMode()
            }
    }

    private fun setupNetwork() {
        val cm =
            shadowOf(
                ApplicationProvider.getApplicationContext<Context>()
                    .getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager,
            )
        val wifiManager =
            shadowOf(
                ApplicationProvider.getApplicationContext<Context>()
                    .getSystemService(Context.WIFI_SERVICE) as WifiManager,
            )
        cm.setActiveNetworkInfo(
            ShadowNetworkInfo.newInstance(
                NetworkInfo.DetailedState.CONNECTED,
                ConnectivityManager.TYPE_WIFI,
                -1,
                true,
                NetworkInfo.State.CONNECTED,
            ),
        )
        ReflectionHelpers.callInstanceMethod<Any>(
            wifiManager,
            "setWifiEnabled",
            ReflectionHelpers.ClassParameter.from(Boolean::class.java, true),
        )
        ReflectionHelpers.callInstanceMethod<WifiInfo>(
            wifiManager,
            "getConnectionInfo",
        ).run {
            ReflectionHelpers.callInstanceMethod<Any>(
                this,
                "setInetAddress",
                ReflectionHelpers.ClassParameter.from(
                    InetAddress::class.java,
                    InetAddress.getLoopbackAddress(),
                ),
            )
        }
    }

    /**
     * Kill FTP server if there is one running
     */
    @After
    fun tearDown() {
        ftpClient?.logout()
        server?.stop()
    }

    /**
     * Test on change directory functions
     */
    @Test
    fun testChdir() {
        ftpClient!!.run {
            assertEquals(directories.size + 1, listFiles().size)
            assertTrue(changeWorkingDirectory("Download"))
            assertEquals(0, listFiles().size)
            assertTrue(changeWorkingDirectory(".."))
            assertEquals(directories.size + 1, listFiles().size)
            assertTrue(changeWorkingDirectory("/1/2/3/4/5/6/7"))
            assertEquals(0, listFiles().size)
            assertTrue(changeWorkingDirectory("../"))
            assertTrue(printWorkingDirectory().startsWith("/1/2/3/4/5/6"))
            assertTrue(changeToParentDirectory())
            assertTrue(printWorkingDirectory().startsWith("/1/2/3/4/5"))
            assertTrue(changeWorkingDirectory("../../.."))
            assertTrue(printWorkingDirectory().startsWith("/1/2"))
        }
    }

    /**
     * Test remove directory function
     */
    @Test
    fun testRmDir() {
        ftpClient!!.run {
            assertTrue(changeWorkingDirectory("/"))
            assertTrue(makeDirectory("foobar"))
            assertEquals(directories.size + 2, listFiles().size)
            assertTrue(removeDirectory("foobar"))
            assertEquals(directories.size + 1, listFiles().size)
            assertFalse(changeWorkingDirectory("foobar"))
            assertTrue(listFiles("/foobar").isNullOrEmpty())
        }
    }

    /**
     * Test download file
     */
    @Test
    fun testDownloadFile() {
        ftpClient!!.run {
            assertFalse(deleteFile("/nonexist.file.txt"))
            assertNull(retrieveFileStream("/not/existing/file"))
            assertFalse(
                retrieveFile(
                    "/barrier/nonexist.file.jpg",
                    FileOutputStream(File.createTempFile("notused", "output")),
                ),
            )
            assertTrue(changeWorkingDirectory("/"))
            retrieveFileStream("test.bin").let {
                assertNotNull(it)
                it.close()
            }
            completePendingCommand()
            assertTrue(printWorkingDirectory() == "/")
        }
    }

    /**
     * Test upload file
     */
    @Test
    fun testUploadFile() {
        ftpClient!!.run {
            storeFileStream("/test2.bin").let {
                ByteArrayInputStream(Random.nextBytes(24)).copyTo(it)
                it.flush()
                it.close()
            }
            completePendingCommand()
            assertTrue(rename("/test2.bin", "/test2.arc.bin"))
        }
    }

    /**
     * Test working with files and folders at subfolders
     */
    @Test
    fun testUploadFileToSubDir() {
        ftpClient!!.run {
            assertTrue(makeDirectory("/CROSS OVER"))
            storeFileStream("/CROSS OVER/test3.bin").let {
                ByteArrayInputStream(Random.nextBytes(24)).copyTo(it)
                it.flush()
                it.close()
            }
            completePendingCommand()
            assertTrue(changeWorkingDirectory("/CROSS OVER"))
            listFiles().let {
                assertEquals(1, it.size)
                assertEquals("test3.bin", it[0].name)
            }
            assertTrue(makeDirectory("/CROSS OVER/multiple"))
            assertTrue(makeDirectory("/CROSS OVER/multiple/levels down"))
            assertTrue(changeWorkingDirectory("/CROSS OVER/multiple"))
            assertTrue(changeWorkingDirectory("levels down"))
            assertEquals("/CROSS OVER/multiple/levels down", printWorkingDirectory())
            assertTrue(deleteFile("/CROSS OVER/test3.bin"))
            assertTrue(changeWorkingDirectory("/CROSS OVER"))
            listFiles().let {
                assertEquals(1, it.size)
                assertEquals("multiple", it[0].name)
            }
        }
    }
}