import datetime
import hashlib
import io
import traceback
import uuid

import numpy as np
import pandas as pd
from fastapi import APIRouter, HTTPException
from fastapi.responses import StreamingResponse

from apps.chat.curd.chat import list_chats, get_chat_with_records, create_chat, rename_chat, \
    delete_chat, get_chat_chart_data, get_chat_predict_data
from apps.chat.models.chat_model import CreateChat, ChatRecord, RenameChat, ChatQuestion, ExcelData
from apps.chat.task.llm import LLMService
from common.core.config import settings
from common.core.deps import CurrentAssistant, SessionDep, CurrentUser
from starlette.responses import FileResponse

router = APIRouter(tags=["Data Q&A"], prefix="/chat")


@router.get("/list")
async def chats(session: SessionDep, current_user: CurrentUser):
    return list_chats(session, current_user)


@router.get("/get/{chart_id}")
async def get_chat(session: SessionDep, current_user: CurrentUser, chart_id: int, current_assistant: CurrentAssistant):
    try:
        return get_chat_with_records(chart_id=chart_id, session=session, current_user=current_user,
                                     current_assistant=current_assistant)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )


@router.get("/record/get/{chart_record_id}/data")
async def chat_record_data(session: SessionDep, chart_record_id: int):
    try:
        return get_chat_chart_data(chart_record_id=chart_record_id, session=session)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )


@router.get("/record/get/{chart_record_id}/predict_data")
async def chat_predict_data(session: SessionDep, chart_record_id: int):
    try:
        return get_chat_predict_data(chart_record_id=chart_record_id, session=session)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )


@router.post("/rename")
async def rename(session: SessionDep, chat: RenameChat):
    try:
        return rename_chat(session=session, rename_object=chat)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )


@router.get("/delete/{chart_id}")
async def delete(session: SessionDep, chart_id: int):
    try:
        return delete_chat(session=session, chart_id=chart_id)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )


@router.post("/start")
async def start_chat(session: SessionDep, current_user: CurrentUser, create_chat_obj: CreateChat):
    try:
        return create_chat(session, current_user, create_chat_obj)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )


@router.post("/assistant/start")
async def start_chat(session: SessionDep, current_user: CurrentUser):
    try:
        return create_chat(session, current_user, CreateChat(origin=2), False)
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )


@router.post("/recommend_questions/{chat_record_id}")
async def recommend_questions(session: SessionDep, current_user: CurrentUser, chat_record_id: int,
                              current_assistant: CurrentAssistant):
    try:
        record = session.get(ChatRecord, chat_record_id)
        if not record:
            raise HTTPException(
                status_code=400,
                detail=f"Chat record with id {chat_record_id} not found"
            )
        request_question = ChatQuestion(chat_id=record.chat_id, question=record.question if record.question else '')

        llm_service = LLMService(current_user, request_question, current_assistant)
        llm_service.set_record(record)
        llm_service.run_recommend_questions_task_async()
    except Exception as e:
        traceback.print_exc()
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )

    return StreamingResponse(llm_service.await_result(), media_type="text/event-stream")


@router.post("/question")
async def stream_sql(session: SessionDep, current_user: CurrentUser, request_question: ChatQuestion,
                     current_assistant: CurrentAssistant):
    """Stream SQL analysis results
    
    Args:
        session: Database session
        current_user: CurrentUser
        request_question: User question model
        
    Returns:
        Streaming response with analysis results
    """

    try:
        llm_service = LLMService(current_user, request_question, current_assistant)
        llm_service.init_record()
        llm_service.run_task_async()
    except Exception as e:
        traceback.print_exc()
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )

    return StreamingResponse(llm_service.await_result(), media_type="text/event-stream")


@router.post("/record/{chat_record_id}/{action_type}")
async def analysis_or_predict(session: SessionDep, current_user: CurrentUser, chat_record_id: int, action_type: str,
                              current_assistant: CurrentAssistant):
    if action_type != 'analysis' and action_type != 'predict':
        raise HTTPException(
            status_code=404,
            detail="Not Found"
        )

    record = session.query(ChatRecord).get(chat_record_id)
    if not record:
        raise HTTPException(
            status_code=400,
            detail=f"Chat record with id {chat_record_id} not found"
        )

    if not record.chart:
        raise HTTPException(
            status_code=500,
            detail=f"Chat record with id {chat_record_id} has not generated chart, do not support to analyze it"
        )

    request_question = ChatQuestion(chat_id=record.chat_id, question='')

    try:
        llm_service = LLMService(current_user, request_question, current_assistant)
        llm_service.run_analysis_or_predict_task_async(action_type, record)
    except Exception as e:
        traceback.print_exc()
        raise HTTPException(
            status_code=500,
            detail=str(e)
        )

    return StreamingResponse(llm_service.await_result(), media_type="text/event-stream")


@router.post("/excel/export")
async def export_excel(excel_data: ExcelData):
    _fields_list = []
    data = []
    for _data in excel_data.data:
        _row = []
        for field in excel_data.axis:
            _row.append(_data.get(field.value))
        data.append(_row)
    for field in excel_data.axis:
        _fields_list.append(field.name)
    df = pd.DataFrame(np.array(data), columns=_fields_list)

    file_name = f"{excel_data.name}-{datetime.datetime.now().strftime('%Y-%m-%d_%H-%M-%S')}_{hashlib.sha256(uuid.uuid4().bytes).hexdigest()[:10]}.xlsx"

    file_path = f'{(settings.EXCEL_PATH if settings.EXCEL_PATH[-1] == "/" else (settings.EXCEL_PATH + "/"))}{file_name}'

    buffer = io.BytesIO()
    df.to_excel(buffer, index=False)
    buffer.seek(0)

    return StreamingResponse(io.BytesIO(buffer.getvalue()))