import json
from fastapi import APIRouter, Depends, HTTPException, Request, Response
from fastapi.responses import StreamingResponse, JSONResponse
from api.auth import verify_app_secret
from api.config import ALLOWED_MODELS
from api.models import ChatRequest
from api.utils import process_non_streaming_response, process_streaming_response
from api.logger import setup_logger

logger = setup_logger(__name__)

router = APIRouter()

@router.options("/v1/chat/completions")
@router.options("/api/v1/chat/completions")
async def chat_completions_options():
    return Response(
        status_code=200,
        headers={
            "Access-Control-Allow-Origin": "*",
            "Access-Control-Allow-Methods": "POST, OPTIONS",
            "Access-Control-Allow-Headers": "Content-Type, Authorization",
        },
    )

@router.get("/v1/models")
@router.get("/api/v1/models")
async def list_models():
    return {"object": "list", "data": ALLOWED_MODELS}

async def stream_wrapper(request: ChatRequest):
    """包装流式响应，处理可能的错误"""
    try:
        async for chunk in process_streaming_response(request):
            yield chunk
    except Exception as e:
        logger.error(f"Error in stream_wrapper: {str(e)}")
        error_response = {
            "error": {
                "message": "抱歉，处理请求时出现错误，请重试",
                "type": "stream_error",
                "code": 500
            }
        }
        yield f"data: {json.dumps(error_response)}\n\n"
        yield "data: [DONE]\n\n"

@router.post("/v1/chat/completions")
@router.post("/api/v1/chat/completions")
async def chat_completions(
    request: ChatRequest, app_secret: str = Depends(verify_app_secret)
):
    logger.info("Entering chat_completions route")
    logger.info(f"Received request: {request}")
    logger.info(f"App secret: {app_secret}")
    logger.info(f"Received chat completion request for model: {request.model}")

    if request.model not in [model["id"] for model in ALLOWED_MODELS]:
        raise HTTPException(
            status_code=400,
            detail=f"Model {request.model} is not allowed. Allowed models are: {', '.join(model['id'] for model in ALLOWED_MODELS)}",
        )

    try:
        if request.stream:
            logger.info("Streaming response")
            return StreamingResponse(
                stream_wrapper(request),
                media_type="text/event-stream",
                headers={
                    "Cache-Control": "no-cache",
                    "Connection": "keep-alive",
                    "Transfer-Encoding": "chunked"
                }
            )
        else:
            logger.info("Non-streaming response")
            return await process_non_streaming_response(request)
    except Exception as e:
        logger.error(f"Error in chat_completions: {str(e)}")
        return JSONResponse(
            status_code=500,
            content={"error": "处理请求时出现错误，请重试"}
        )


@router.route('/')  
@router.route('/healthz')  
@router.route('/ready')  
@router.route('/alive')  
@router.route('/status') 
@router.get("/health")
def health_check(request: Request):  
    return Response(content=json.dumps({"status": "ok"}), media_type="application/json")