from ..models.requestModels import DeleteTable, LoadMySQLorPostgreSQL, LoadMongoDB
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from fastapi import APIRouter, Depends, UploadFile, File, Form
from fastapi.exceptions import HTTPException
from pymongo.mongo_client import MongoClient
from fastapi.responses import JSONResponse
from ..utils.functions import verifyToken
from pymongo.server_api import ServerApi
from sqlalchemy import create_engine
from urllib.request import urlopen
from supabase import create_client
from fastapi import APIRouter
import pandas as pd
from typing import Annotated
import tempfile
import json
import time
import io
import os

router = APIRouter()
security = HTTPBearer()
client = create_client(
    supabase_url = os.environ["SUPABASE_URL"],
    supabase_key = os.environ["SUPABASE_KEY"]
)

@router.post("/loadCsvData")
async def loadCsvData(projectId: Annotated[str, Form()], file: Annotated[UploadFile, File()], credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)]):
    try:
        if verifyToken(token = credentials.credentials):
            project = client.table("Projects").select("projectId", "projectName", "dataTables").eq("projectId", projectId).execute().data[0]                
            with tempfile.NamedTemporaryFile(delete = True, suffix = ".parquet") as temp:
                pd.read_csv(io.BytesIO(await file.read())).to_parquet(temp.name, compression = "snappy")
                _ = client.storage.from_("AnalyticsHub").upload(
                    file = temp.name,
                    path = f"{projectId}/{os.path.splitext(file.filename)[0] + '.parquet'}"
                )
                if project["dataTables"]:
                    projectData = project["dataTables"] + f", {os.path.splitext(file.filename)[0]}"
                else:
                    projectData = os.path.splitext(file.filename)[0]
                _ = client.table("Projects").update({"dataTables": projectData}).eq("projectId", projectId).execute()
                temp.close()
            return JSONResponse(status_code = 200, content = {"status": "SUCCESS", "message": "Data loaded successfully"})
        else:
            return JSONResponse(status_code = 498, content = {"status": "ERROR", "errorDetail": "Invalid Token"})
    except Exception as e:
        raise HTTPException(status_code = 500, detail = f"Endpoint says: {e}")
    
@router.post("/loadExcelData")
async def loadExcelData(projectId: Annotated[str, Form()], file: Annotated[UploadFile, File()], credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)], sheetName: Annotated[str | None, Form()] = None):
    try:
        if verifyToken(token = credentials.credentials):
            project = client.table("Projects").select("projectId", "projectName", "dataTables").eq("projectId", projectId).execute().data[0]                
            with tempfile.NamedTemporaryFile(delete = True, suffix = ".parquet") as temp:
                pd.read_excel(io.BytesIO(await file.read()), sheet_name = sheetName).to_parquet(temp.name, compression = "snappy")
                if sheetName == None:
                    fileName = f"{os.path.splitext(file.filename)[0] + '.parquet'}"
                else:
                    fileName = f"{os.path.splitext(file.filename)[0] + '_' + sheetName + '.parquet'}"
                _ = client.storage.from_("AnalyticsHub").upload(
                    file = temp.name,
                    path = f"{projectId}/{fileName}"
                )
                if project["dataTables"]:
                    projectData = project["dataTables"] + f", {fileName}"
                else:
                    projectData = fileName
                _ = client.table("Projects").update({"dataTables": projectData}).eq("projectId", projectId).execute()
                temp.close()
            return JSONResponse(status_code = 200, content = {"status": "SUCCESS", "message": "Data loaded successfully"})
        else:
            return JSONResponse(status_code = 498, content = {"status": "ERROR", "errorDetail": "Invalid Token"})
    except Exception as e:
        raise HTTPException(status_code = 500, detail = f"Endpoint says: {e}")

@router.post("/loadMySql")
async def loadMySql(connection: LoadMySQLorPostgreSQL, credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)]):
    try:
        if verifyToken(token = credentials.credentials):
            project = client.table("Projects").select("projectId", "projectName", "dataTables").eq("projectId", connection.projectId).execute().data[0]                
            with tempfile.NamedTemporaryFile(delete = True, suffix = ".parquet") as temp:
                connStr = f"mysql+pymysql://{connection.user}:{connection.password}@{connection.host}:{connection.port}/{connection.db}"
                engine = create_engine(connStr)
                pd.read_sql(f"SELECT * FROM {connection.table}", engine).to_parquet(temp.name, compression = "snappy")
                _ = client.storage.from_("AnalyticsHub").upload(
                    file = temp.name,
                    path = f"{connection.projectId}/{connection.table + '.parquet'}"
                )
                if project["dataTables"]:
                    projectData = project["dataTables"] + f", {connection.table + '.parquet'}"
                else:
                    projectData = connection.table
                _ = client.table("Projects").update({"dataTables": projectData}).eq("projectId", connection.projectId).execute()
                temp.close()
            return JSONResponse(status_code = 200, content = {"status": "SUCCESS", "message": "Data loaded successfully"})
        else:
            return JSONResponse(status_code = 498, content = {"status": "ERROR", "errorDetail": "Invalid Token"})
    except Exception as e:
        raise HTTPException(status_code = 500, detail = f"Endpoint says: {e}")
    
@router.post("/loadPostgreSQL")
async def loadPostgreSQL(connection: LoadMySQLorPostgreSQL, credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)]):
    try:
        if verifyToken(token = credentials.credentials):
            project = client.table("Projects").select("projectId", "projectName", "dataTables").eq("projectId", connection.projectId).execute().data[0]                
            with tempfile.NamedTemporaryFile(delete = True, suffix = ".parquet") as temp:
                connStr = f"postgresql+psycopg2://{connection.user}:{connection.password}@{connection.host}:{connection.port}/{connection.db}"
                engine = create_engine(connStr)
                pd.read_sql(f"SELECT * FROM {connection.table}", engine).to_parquet(temp.name, compression = "snappy")
                _ = client.storage.from_("AnalyticsHub").upload(
                    file = temp.name,
                    path = f"{connection.projectId}/{connection.table + '.parquet'}"
                )
                if project["dataTables"]:
                    projectData = project["dataTables"] + f", {connection.table + '.parquet'}"
                else:
                    projectData = connection.table
                _ = client.table("Projects").update({"dataTables": projectData}).eq("projectId", connection.projectId).execute()
                temp.close()
            return JSONResponse(status_code = 200, content = {"status": "SUCCESS", "message": "Data loaded successfully"})
        else:
            return JSONResponse(status_code = 498, content = {"status": "ERROR", "errorDetail": "Invalid Token"})
    except Exception as e:
        raise HTTPException(status_code = 500, detail = f"Endpoint says: {e}")
    
@router.post("/loadMongoDB")
async def loadMongoDB(connection: LoadMongoDB, credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)]):
    try:
        if verifyToken(token = credentials.credentials):
            project = client.table("Projects").select("projectId", "projectName", "dataTables").eq("projectId", connection.projectId).execute().data[0]                
            with tempfile.NamedTemporaryFile(delete = True, suffix = ".parquet") as temp:
                mongoClient = MongoClient(connection.connectionString, server_api=ServerApi('1'))
                records = list(mongoClient[connection.db][connection.collection].find())
                for record in records: record.pop("_id")
                pd.DataFrame(records).to_parquet(temp.name, compression = "snappy")
                _ = client.storage.from_("AnalyticsHub").upload(
                    file = temp.name,
                    path = f"{connection.projectId}/{connection.collection + '.parquet'}"
                )
                if project["dataTables"]:
                    projectData = project["dataTables"] + f", {connection.collection + '.parquet'}"
                else:
                    projectData = connection.collection
                _ = client.table("Projects").update({"dataTables": projectData}).eq("projectId", connection.projectId).execute()
                temp.close()
            return JSONResponse(status_code = 200, content = {"status": "SUCCESS", "message": "Data loaded successfully"})
        else:
            return JSONResponse(status_code = 498, content = {"status": "ERROR", "errorDetail": "Invalid Token"})
    except Exception as e:
        raise HTTPException(status_code = 500, detail = f"Endpoint says: {e}")

@router.delete("/deleteTable")
async def deleteTable(tableDetails: DeleteTable, credentials: Annotated[HTTPAuthorizationCredentials, Depends(security)]):
    try:
        if verifyToken(token = credentials.credentials):
            _ = client.storage.from_("AnalyticsHub").remove(f"{tableDetails.projectId}/{tableDetails.tableName}" + ".parquet")
            projectTables = client.table("Projects").select("dataTables").eq("projectId", tableDetails.projectId).execute().data[0]["dataTables"]
            projectTables = projectTables.split(", ")
            projectTables.remove(tableDetails.tableName)
            projectTables = ", ".join(projectTables)
            _ = client.table("Projects").update({"dataTables": projectTables}).eq("projectId", tableDetails.projectId).execute()
            fileUrl = os.environ["FILE_URL"].format(projectId = tableDetails.projectId, fileName = "metadata.json").replace(".parquet", "") + f"?cb={int(time.time())}"
            jsonData = json.loads(urlopen(fileUrl).read())
            jsonData.pop(tableDetails.tableName)
            with io.BytesIO() as buffer:
                buffer.write(json.dumps(jsonData, indent=4).encode("utf-8"))
                buffer.seek(0)
                client.storage.from_("AnalyticsHub").upload(path = f"{tableDetails.projectId}/metadata.json", file = buffer.getvalue(), file_options = {"upsert": "true"})
            return JSONResponse(status_code = 200, content = {"status": "SUCCESS", "message": "Table deleted successfully"})
        else:
            return JSONResponse(status_code = 498, content = {"status": "ERROR", "errorDetail": "Invalid Token"})    
    except Exception as e:
        raise HTTPException(status_code = 500, detail = f"Endpoint says: {e}")