from ast import main
import json
import uuid
from fastapi import FastAPI, HTTPException, Request
from fastapi.responses import JSONResponse
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
from utils.params import DecodeContentParam, PatternContentParam
from dotenv import load_dotenv, find_dotenv
from typing import List, Dict, Any, Optional

from tasks.decode import begin_decode_task
from tasks.detail import get_decode_detail_by_task_id
from tasks.pattern import begin_pattern_task

from loguru import logger
import sys

logger.add(sink=sys.stderr, level="ERROR", backtrace=True, diagnose=True)

# 响应消息映射
RESPONSE_MSG_MAP = {
    0: "success",
    1002: "视频不存在",
    2001: "解构/聚类任务创建失败",
    -1: "failed",
    404: "任务不存在"
}

load_dotenv(find_dotenv(), override=False)
app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

@app.exception_handler(HTTPException)
async def http_exception_handler(request: Request, exc: HTTPException):
    return JSONResponse(
        status_code=200,
        content={"code": exc.status_code, "message": exc.message, "data": None}
    )

def _build_api_response(
    code: int,
    data: Any = None,
    reason: Optional[str] = None
) -> JSONResponse:
    """构建统一的API响应"""
    msg = RESPONSE_MSG_MAP.get(code, "failed")
    content = {
        "code": code,
        "msg": msg,
        "data": data
    }
    
    # 失败时添加 reason 字段
    if code != 0 and reason:
        content["reason"] = reason
    
    return JSONResponse(status_code=200, content=content)


@app.post("/api/v1/content/tasks/decode")
def decode_content(param: DecodeContentParam):
    """创建解构任务"""
    res = begin_decode_task(param)
    code = res.get("code", -1)
    task_id = res.get("task_id")
    reason = res.get("reason", "")
    
    return _build_api_response(
        code=code,
        data={"task_id": task_id} if task_id else None,
        reason=reason
    )

@app.get("/api/v1/content/tasks/{taskId}")
def get_task_detail(taskId: str):
    """获取任务详情"""
    result = get_decode_detail_by_task_id(taskId)
    
    # 任务不存在
    if result is None:
        return _build_api_response(code=404, data=None)
    
    # 直接返回结果（已经包含 code、msg、data、reason）
    return JSONResponse(status_code=200, content=result)

@app.post("/api/v1/content/tasks/pattern")
def pattern_content(param: PatternContentParam):
    """创建聚类任务"""
    res = begin_pattern_task(param)
    code = res.get("code", -1)
    task_id = res.get("task_id")
    reason = res.get("reason", "")
    
    return _build_api_response(
        code=code,
        data={"task_id": task_id} if task_id else None,
        reason=reason
    )