#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
使用 FastAPI 重构的 Agent 服务
提供现代化的 HTTP API 接口
"""

import json
import sys
import os
import time
from typing import Any, Dict, List, Optional
from contextlib import asynccontextmanager

# 保证可以导入本项目模块
sys.path.append(os.path.dirname(os.path.abspath(__file__)))

from fastapi import FastAPI, HTTPException, BackgroundTasks
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
import uvicorn

from utils.logging_config import get_logger
from agent_tools import QueryDataTool, IdentifyTool, StructureTool

# 创建 logger
logger = get_logger('AgentFastAPI')

# 请求模型
class TriggerRequest(BaseModel):
    requestId: str = Field(..., description="请求ID")

# 响应模型
class TriggerResponse(BaseModel):
    requestId: str
    processed: int
    success: int
    details: List[Dict[str, Any]]

# 全局变量
identify_tool = None

@asynccontextmanager
async def lifespan(app: FastAPI):
    """应用生命周期管理"""
    # 启动时初始化
    global identify_tool
    identify_tool = IdentifyTool()
    logger.info("Agent 服务启动完成")
    
    yield
    
    # 关闭时清理
    logger.info("Agent 服务正在关闭")

# 创建 FastAPI 应用
app = FastAPI(
    title="Knowledge Agent API",
    description="智能内容识别和结构化处理服务",
    version="1.0.0",
    lifespan=lifespan
)

@app.get("/")
async def root():
    """根路径，返回服务信息"""
    return {
        "service": "Knowledge Agent API",
        "version": "1.0.0",
        "status": "running",
        "endpoints": {
            "parse": "/parse",
            "health": "/health",
            "docs": "/docs"
        }
    }

@app.get("/health")
async def health_check():
    """健康检查接口"""
    return {"status": "healthy", "timestamp": time.time()}

@app.post("/parse", response_model=TriggerResponse)
async def parse_processing(request: TriggerRequest, background_tasks: BackgroundTasks):
    """
    解析内容处理
    
    - **requestId**: 请求ID，用于标识处理任务
    """
    try:
        logger.info(f"收到解析请求: requestId={request.requestId}")
        
        # 获取待处理数据
        items = QueryDataTool.fetch_crawl_data_list(request.requestId)
        if not items:
            return TriggerResponse(
                requestId=request.requestId,
                processed=0,
                success=0,
                details=[]
            )

        # 处理数据
        success_count = 0
        details: List[Dict[str, Any]] = []
        
        for idx, item in enumerate(items, start=1):
            try:
                crawl_data = item.get('crawl_data') or {}
                
                # Step 1: 识别
                identify_result = identify_tool.run(
                    crawl_data if isinstance(crawl_data, dict) else {}
                )
                
                # Step 2: 结构化并入库
                affected = StructureTool.store_parsing_result(
                    request.requestId, 
                    item.get('raw') or {}, 
                    identify_result
                )
                
                ok = affected is not None and affected > 0
                if ok:
                    success_count += 1
                
                details.append({
                    "index": idx,
                    "dbInserted": ok,
                    "identifyError": identify_result.get('error'),
                    "status": "success" if ok else "failed"
                })
                
            except Exception as e:
                logger.error(f"处理第 {idx} 项时出错: {e}")
                details.append({
                    "index": idx,
                    "dbInserted": False,
                    "identifyError": str(e),
                    "status": "error"
                })

        result = TriggerResponse(
            requestId=request.requestId,
            processed=len(items),
            success=success_count,
            details=details
        )
        
        logger.info(f"处理完成: requestId={request.requestId}, processed={len(items)}, success={success_count}")
        return result
        
    except Exception as e:
        logger.error(f"处理请求失败: {e}")
        raise HTTPException(status_code=500, detail=f"处理失败: {str(e)}")

@app.post("/parse/async")
async def parse_processing_async(request: TriggerRequest, background_tasks: BackgroundTasks):
    """
    异步解析内容处理（后台任务）
    
    - **requestId**: 请求ID，用于标识处理任务
    """
    try:
        logger.info(f"收到异步解析请求: requestId={request.requestId}")
        
        # 添加后台任务
        background_tasks.add_task(process_request_background, request.requestId)
        
        return {
            "requestId": request.requestId,
            "status": "processing",
            "message": "任务已提交到后台处理"
        }
        
    except Exception as e:
        logger.error(f"提交异步任务失败: {e}")
        raise HTTPException(status_code=500, detail=f"提交任务失败: {str(e)}")

async def process_request_background(request_id: str):
    """后台处理请求"""
    try:
        logger.info(f"开始后台处理: requestId={request_id}")
        
        # 获取待处理数据
        items = QueryDataTool.fetch_crawl_data_list(request_id)
        if not items:
            logger.info(f"后台处理完成: requestId={request_id}, 无数据需要处理")
            return

        # 处理数据
        success_count = 0
        for idx, item in enumerate(items, start=1):
            try:
                crawl_data = item.get('crawl_data') or {}
                
                # Step 1: 识别
                identify_result = identify_tool.run(
                    crawl_data if isinstance(crawl_data, dict) else {}
                )
                
                # Step 2: 结构化并入库
                affected = StructureTool.store_parsing_result(
                    request_id, 
                    item.get('raw') or {}, 
                    identify_result
                )
                
                if affected is not None and affected > 0:
                    success_count += 1
                
                logger.info(f"后台处理进度: {idx}/{len(items)} - {'成功' if affected else '失败'}")
                
            except Exception as e:
                logger.error(f"后台处理第 {idx} 项时出错: {e}")

        logger.info(f"后台处理完成: requestId={request_id}, processed={len(items)}, success={success_count}")
        
    except Exception as e:
        logger.error(f"后台处理失败: requestId={request_id}, error={e}")

if __name__ == "__main__":
    # 启动服务
    uvicorn.run(
        "agent:app",
        host="0.0.0.0",
        port=8080,
        reload=True,  # 开发模式，自动重载
        log_level="info"
    )