from openai import OpenAI
import pandas as pd
import psycopg2
import time
import gradio as gr
import sqlparse
import re
import os
import warnings
from persistStorage import saveLog


from config import *
from constants import *
from utils import *
from gptManager import ChatgptManager
# from queryHelper import QueryHelper

pd.set_option('display.max_columns', None)
pd.set_option('display.max_rows', None)


# Filter out all warning messages
warnings.filterwarnings("ignore")

dbCreds = DataWrapper(DB_CREDS_DATA)
dbEngine = DbEngine(dbCreds)
dbEngine.connect()

tablesAndCols = getAllTablesInfo(dbEngine, SCHEMA_NAME)
metadataLayout = MetaDataLayout(schemaName=SCHEMA_NAME, allTablesAndCols=tablesAndCols)
metadataLayout.setSelection(DEFAULT_TABLES_COLS)

selectedTablesAndCols = metadataLayout.getSelectedTablesAndCols()

def getSampleDataForTablesAndCols(dbEngine, schemaName, tablesAndCols, maxRows):
    data = {}
    conn = dbEngine.connection
    for table in tablesAndCols.keys():
      try:
        sqlQuery = f"""select * from {schemaName}.{table} limit {maxRows}"""
        data[table] = pd.read_sql_query(sqlQuery, con=conn)
      except Exception as e:
        print(e)
        print(f"couldn't read table data. Table: {table}")
    return data
  
class QueryHelper:
  def __init__(self, gptInstance, dbEngine, schemaName, 
               platform, metadataLayout, sampleDataRows, 
               gptSampleRows, getSampleDataForTablesAndCols):
    self.gptInstance = gptInstance
    self.schemaName = schemaName
    self.platform = platform
    self.metadataLayout = metadataLayout
    self.sampleDataRows = sampleDataRows
    self.gptSampleRows = gptSampleRows
    self.getSampleDataForTablesAndCols = getSampleDataForTablesAndCols
    self.dbEngine = dbEngine
    self._onMetadataChange()
  
  def _onMetadataChange(self):
    metadataLayout = self.metadataLayout
    sampleDataRows = self.sampleDataRows
    dbEngine = self.dbEngine
    schemaName = self.schemaName
    
    selectedTablesAndCols = metadataLayout.getSelectedTablesAndCols()
    self.sampleData = self.getSampleDataForTablesAndCols(dbEngine=dbEngine,schemaName=schemaName,
                                                         tablesAndCols=selectedTablesAndCols, maxRows=sampleDataRows)
  
  def getMetadata(self):
    return self.metadataLayout
  
  def updateMetadata(self, metadataLayout):
    self.metadataLayout = metadataLayout
    self._onMetadataChange()

  def modifySqlQueryEnteredByUser(self, userSqlQuery):
    platform = self.platform
    userPrompt = f"Please correct the following sql query, also it has to be run on {platform}. sql query is \n {userSqlQuery}."
    systemPrompt = ""
    modifiedSql = self.gptInstance.getResponseForUserInput(userPrompt, systemPrompt)
    return modifiedSql
  
  def filteredSampleDataForProspects(self, prospectTablesAndCols):
    sampleData = self.sampleData
    filteredData = {}
    for table in prospectTablesAndCols.keys():
      # filteredData[table] = sampleData[table][prospectTablesAndCols[table]]
      #take all columns of prospects
      filteredData[table] = sampleData[table]
    return filteredData
  
  def getQueryForUserInput(self, userInput):
    gptSampleRows = self.gptSampleRows
    selectedTablesAndCols = self.metadataLayout.getSelectedTablesAndCols()
    prospectTablesAndCols = self.getProspectiveTablesAndCols(userInput, selectedTablesAndCols)
    print("getting prospects", prospectTablesAndCols)
    prospectTablesData = self.filteredSampleDataForProspects(prospectTablesAndCols)
    systemPromptForQueryGeneration = self.getSystemPromptForQueryGeneration(prospectTablesData, gptSampleRows=gptSampleRows)
    queryByGpt = self.gptInstance.getResponseForUserInput(userInput, systemPromptForQueryGeneration)
    return queryByGpt

  def getProspectiveTablesAndCols(self, userInput, selectedTablesAndCols):
    schemaName = self.schemaName

    systemPromptForProspectColumns = self.getSystemPromptForProspectColumns(selectedTablesAndCols)
    prospectiveTablesColsText = self.gptInstance.getResponseForUserInput(userInput, systemPromptForProspectColumns)
    prospectTablesAndCols = {}
    for table in selectedTablesAndCols.keys():
      if table in prospectiveTablesColsText:
        prospectTablesAndCols[table] = []
        for column in selectedTablesAndCols[table]:
          if column in prospectiveTablesColsText:
            prospectTablesAndCols[table].append(column)
    return prospectTablesAndCols

  def getSystemPromptForQueryGeneration(self, prospectTablesData, gptSampleRows):
    schemaName = self.schemaName
    platform = self.platform
    prompt = f"""Given an input text, generate the corresponding SQL query for given details. Schema Name is {schemaName}. And sql platform is {platform}.\n following is sample data"""
    for idx, tableName in enumerate(prospectTablesData.keys(), start=1):
        prompt += f"table name is {tableName}, table data is {prospectTablesData[tableName].head(gptSampleRows)}"
    prompt += "XXXX"
    return prompt.replace("\n"," ").replace("\\"," ").replace("  "," ").replace("XXXX", "    ")

  def getSystemPromptForProspectColumns(self, selectedTablesAndCols):
    schemaName = self.schemaName
    platform = self.platform

    prompt = f"""Given an input text, User wants to know which all tables and columns would be possibily to have the desired data. Output them as json. Schema Name is {schemaName}. And sql platform is {platform}.\n"""
    for idx, tableName in enumerate(selectedTablesAndCols.keys(), start=1):
        prompt += f"table name {tableName} {', '.join(selectedTablesAndCols[tableName])}"
    prompt += "XXXX"
    return prompt.replace("\n"," ").replace("\\"," ").replace("  "," ").replace("XXXX", "    ")
  

openAIClient = OpenAI(api_key=OPENAI_API_KEY)
gptInstance = ChatgptManager(openAIClient, model=GPT_MODEL)
queryHelper = QueryHelper(gptInstance=gptInstance,
                          schemaName=SCHEMA_NAME,platform=PLATFORM, 
                          metadataLayout=metadataLayout, 
                          sampleDataRows=SAMPLE_ROW_MAX, 
                          gptSampleRows=GPT_SAMPLE_ROWS,
                         dbEngine=dbEngine,
                         getSampleDataForTablesAndCols=getSampleDataForTablesAndCols)

def checkAuth(username, password):
  global ADMIN, PASSWD
  if username == ADMIN and password == PASSWD:
      return True
  return False


# Function to save history of chat
def respond(message, chatHistory):
  """gpt response handler for gradio ui"""
  global queryHelper
  try:
      botMessage = queryHelper.getQueryForUserInput(message)
  except Exception as e:
      errorMessage = {"function":"queryHelper.getQueryForUserInput","error":str(e), "userInput":message}
      saveLog(errorMessage, 'error')
      
  logMessage = {"userInput":message, "queryGenerated":botMessage}
  saveLog(logMessage)
  chatHistory.append((message, botMessage))
  time.sleep(2)
  return "", chatHistory

# Function to test the generated sql query
def isDataQuery(sql_query):
    upper_query = sql_query.upper()

    dml_keywords = ['INSERT', 'UPDATE', 'DELETE', 'MERGE']
    for keyword in dml_keywords:
        if re.search(fr'\b{keyword}\b', upper_query):
            return False  # Found a DML keyword, indicating modification

    # If no DML keywords are found, it's likely a data query
    return True

def testSQL(sql):
  global dbEngine, queryHelper

  sql=sql.replace(';', '')
  if ('limit' in sql[-15:].lower())==False:
    sql = sql + ' ' + 'limit 5'
  sql = str(sql)
  sql = sqlparse.format(sql, reindent=True, keyword_case='upper')
  print(sql)
  if not isDataQuery(sql):
    return "Sorry not allowed to run. As the query modifies the data."
  try:
    conn = dbEngine.connection
    df = pd.read_sql_query(sql, con=conn)
    return pd.DataFrame(df)
  except Exception as e:
      errorMessage = {"function":"testSQL","error":str(e), "userInput":sql}
      saveLog(errorMessage, 'error')
      
      print(f"Error occured during running the query {sql}.\n and the error is {str(e)}")
        
      prompt = f"Please correct the following sql query, also it has to be run on {PLATFORM}. sql query is \n {sql}. the error occured is {str(e)}."
      modifiedSql = queryHelper.modifySqlQueryEnteredByUser(prompt)
      return f"The query you entered throws some error. Here is modified version. Please try this.\n {modifiedSql}"


def onSelectedTablesChange(tablesSelected):
  #Updates tables visible and allow selecting columns for them
  global queryHelper
  print(f"Selected tables : {tablesSelected}")
  metadataLayout = queryHelper.getMetadata()
  allTables = list(metadataLayout.getAllTablesCols())
  tableBoxes = []
  for i in range(len(allTables)):
    if allTables[i] in tablesSelected:
      tableBoxes.append(gr.Textbox(f"Textbox {allTables[i]}", visible=True, label=f"{allTables[i]}"))
    else:
      tableBoxes.append(gr.Textbox(f"Textbox {allTables[i]}", visible=False, label=f"{allTables[i]}"))
  return tableBoxes

def onSelectedColumnsChange(*tableBoxes):
  #update selection of columns and tables (include new tables and cols in gpts context)
  global queryHelper
  metadataLayout = queryHelper.getMetadata()
  allTablesList = list(metadataLayout.getAllTablesCols().keys())
  tablesAndCols = {}
  result = ''
  print("Getting selected tables and columns from gradio")
  for tableBox, table in zip(tableBoxes, allTablesList):
    if isinstance(tableBox, list):
      if len(tableBox)!=0:
        tablesAndCols[table] = tableBox
    else:
      pass
  
  metadataLayout.setSelection(tablesAndCols=tablesAndCols)
  print("metadata updated")
  print("Updating queryHelper state, and sample data")
  queryHelper.updateMetadata(metadataLayout)
  return "Columns udpated"

def onResetToDefaultSelection():
  global queryHelper
  tablesSelected = list(DefaultTablesAndCols.keys())
  tableBoxes = []
  allTablesList = list(metadataLayout.getAllTablesCols().keys())
  for i in range(len(allTablesList)):
    if allTablesList[i] in tablesSelected:
      tableBoxes.append(gr.Textbox(f"Textbox {allTablesList[i]}", visible=True, label=f"{allTablesList[i]}"))
    else:
      tableBoxes.append(gr.Textbox(f"Textbox {allTablesList[i]}", visible=False, label=f"{allTablesList[i]}"))

  metadataLayout.resetSelection()
  metadataLayout.setSelection(DefaultTablesAndCols)
  queryHelper.updateMetadata(metadataLayout)

  return tableBoxes



with gr.Blocks() as demo:

    # screen 1 : Chatbot for question answering to generate sql query from user input in english
    with gr.Tab("Query Helper"):
        gr.Markdown("""<h1><center> Query Helper</center></h1>""")
        chatbot = gr.Chatbot()
        msg = gr.Textbox()
        clear = gr.ClearButton([msg, chatbot])
        msg.submit(respond, [msg, chatbot], [msg, chatbot])

    # screen 2 : To run sql query against database
    with gr.Tab("Run Query"):
        gr.Markdown("""<h1><center> Run Query </center></h1>""")
        text_input = gr.Textbox(label = 'Input SQL Query', placeholder="Write your SQL query here ...")
        text_output = gr.Textbox(label = 'Result')
        text_button = gr.Button("RUN QUERY")
        clear = gr.ClearButton([text_input, text_output])
        text_button.click(testSQL, inputs=text_input, outputs=text_output)
     # screen 3 : To set creds, schema, tables and columns
    with gr.Tab("Setup"):
        gr.Markdown("""<h1><center> Run Query </center></h1>""")
        text_input = gr.Textbox(label = 'schema name', value= SCHEMA_NAME)
        allTablesAndCols = queryHelper.getMetadata().getAllTablesCols()
        selectedTablesAndCols = queryHelper.getMetadata().getSelectedTablesAndCols()
        allTablesList = list(allTablesAndCols.keys()) 
        selectedTablesList = list(selectedTablesAndCols.keys())
        
        dropDown = gr.Dropdown(
             allTablesList, value=selectedTablesList, multiselect=True, label="Selected Tables", info="Select Tables from available tables of the schema"
        )

        refreshTables = gr.Button("Refresh selected tables")

        tableBoxes = []
        
        for i in range(len(allTablesList)):
            if allTablesList[i] in selectedTablesList:
              columnsDropDown = gr.Dropdown(
             allTablesAndCols[allTablesList[i]],visible=True,value=selectedTablesAndCols.get(allTablesList[i],None), multiselect=True, label=allTablesList[i], info="Select columns of a table"
        )
              #tableBoxes[allTables[i]] = columnsDropDown
              tableBoxes.append(columnsDropDown)
            else:
              columnsDropDown = gr.Dropdown(
             allTablesAndCols[allTablesList[i]], visible=False, value=None, multiselect=True, label=allTablesList[i], info="Select columns of a table"
        )
              #tableBoxes[allTables[i]] = columnsDropDown
              tableBoxes.append(columnsDropDown)

        refreshTables.click(onSelectedTablesChange, inputs=dropDown, outputs=tableBoxes)




        columnsTextBox = gr.Textbox(label = 'Result')
        refreshColumns = gr.Button("Refresh selected columns and Reload Data")
        refreshColumns.click(onSelectedColumnsChange, inputs=tableBoxes, outputs=columnsTextBox)

        resetToDefaultSelection = gr.Button("Reset to Default")
        resetToDefaultSelection.click(onResetToDefaultSelection, inputs=None, outputs=tableBoxes)


demo.launch(share=True, debug=True, ssl_verify=False, auth=checkAuth)
dbEngine.connect()