from typing import Optional

import requests
from fastapi import Depends, APIRouter, HTTPException, UploadFile, File, Query
from pydantic import BaseModel
from sqlalchemy.orm import Session
from starlette.responses import StreamingResponse

from app.api import Response, get_current_user, ResponseList
from app.config.config import settings
from app.models.agent_model import AgentType, AgentModel
from app.models.base_model import get_db
from app.models.user_model import UserModel
from app.service.bisheng import BishengService
from app.service.ragflow import RagflowService
from app.service.service_token import get_ragflow_token, get_bisheng_token
import urllib.parse

router = APIRouter()


@router.post("/upload/{agent_id}", response_model=Response)
async def upload_file(agent_id: str,
                      file: UploadFile = File(...),
                      chat_id: str = Query(None, description="The ID of the chat"),
                      db: Session = Depends(get_db),
                      current_user: UserModel = Depends(get_current_user)
                      ):
    agent = db.query(AgentModel).filter(AgentModel.id == agent_id).first()
    if not agent:
        return Response(code=404, msg="Agent not found")
    # 读取上传的文件内容
    try:
        file_content = await file.read()
    except Exception as e:
        return Response(code=400, msg=str(e))

    if agent.agent_type == AgentType.RAGFLOW:
        token = get_ragflow_token(db, current_user.id)
        ragflow_service = RagflowService(base_url=settings.fwr_base_url)
        # 查询会话是否存在，不存在先创建会话
        history = await ragflow_service.get_session_history(token, chat_id)
        if len(history) == 0:
            message = {"role": "user", "message": file.filename}
            await ragflow_service.set_session(token, agent_id, message, chat_id, True)

        ragflow_service = RagflowService(base_url=settings.fwr_base_url)
        token = get_ragflow_token(db, current_user.id)
        doc_ids = await ragflow_service.upload_and_parse(token, chat_id, file.filename, file_content)
        return Response(code=200, msg="", data={"doc_ids": doc_ids, "file_name": file.filename})

    elif agent.agent_type == AgentType.BISHENG:
        bisheng_service = BishengService(base_url=settings.sgb_base_url)
        try:
            token = get_bisheng_token(db, current_user.id)
            result = await bisheng_service.upload(token, file.filename, file_content)
        except Exception as e:
            raise HTTPException(status_code=500, detail=str(e))
        result["file_name"] = file.filename
        return Response(code=200, msg="", data=result)

    else:
        return Response(code=200, msg="Unsupported agent type")


@router.get("/download/", response_model=Response)
async def download_file(
        url: Optional[str] = Query(None, description="URL of the file to download for bisheng"),
        agent_id: str = Query(..., description="Agent ID"),
        doc_id: Optional[str] = Query(None, description="Optional doc id for ragflow agents"),
        doc_name: Optional[str] = Query(None, description="Optional doc name for ragflow agents"),
        db: Session = Depends(get_db)
):
    agent = db.query(AgentModel).filter(AgentModel.id == agent_id).first()
    if not agent:
        return Response(code=404, msg="Agent not found")

    if agent.agent_type == AgentType.BISHENG:
        url = urllib.parse.unquote(url)
        # 从 URL 中提取文件名
        parsed_url = urllib.parse.urlparse(url)
        filename = urllib.parse.unquote(parsed_url.path.split('/')[-1])
        url = url.replace("http://minio:9000", settings.sgb_base_url)
    elif agent.agent_type == AgentType.RAGFLOW:
        if not doc_id:
            return Response(code=400, msg="doc_id is required")
        url = f"{settings.fwr_base_url}/v1/document/get/{doc_id}"
        filename = doc_name
    else:
        return Response(code=400, msg="Unsupported agent type")

    try:
        # 发送GET请求获取文件内容
        response = requests.get(url, stream=True)
        response.raise_for_status()  # 检查请求是否成功

        # 返回流式响应
        return StreamingResponse(
            response.iter_content(chunk_size=1024),
            media_type="application/octet-stream",
            headers={"Content-Disposition": f"attachment; filename*=utf-8''{urllib.parse.quote(filename)}"}
        )
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error downloading file: {e}")