# -*- coding: utf-8 -*-
"""主程序入口 - FastAPI版本"""

import time
from fastapi import FastAPI, HTTPException
from core.simulator import AlphaSimulator

# 创建FastAPI应用
app = FastAPI(
    title="Alpha因子模拟器API",
    description="通过HTTP接口触发的因子模拟器",
    version="1.0.0"
)

# 全局变量
_simulator = None
_last_result = None  # 存储上次执行结果
_is_processing = False  # 是否正在处理


def initialize_simulator():
    """初始化模拟器"""
    global _simulator
    if _simulator is None:
        _simulator = AlphaSimulator()
        _simulator.initialize()
        print("模拟器初始化完成")
    return _simulator


@app.get("/")
async def root():
    """根路径，返回服务信息"""
    return {
        "service": "Alpha因子模拟器",
        "version": "1.0.0",
        "status": "running",
        "endpoints": {
            "run_simulation": "POST /run - 触发一次模拟执行",
            "last_result": "GET /result - 获取上次执行结果",
            "status": "GET /status - 查看服务状态",
            "health": "GET /health - 健康检查"
        }
    }


@app.post("/run")
async def run_simulation():
    """
    触发一次模拟执行
    执行顺序：
    1. 刷新token
    2. 加载alpha列表
    3. 执行批量模拟
    """
    global _is_processing, _last_result

    # 检查是否正在处理
    if _is_processing:
        return {
            "status": "busy",
            "message": "已有模拟任务正在执行中，请稍后再试",
            "timestamp": time.time()
        }

    try:
        _is_processing = True

        # 初始化模拟器
        simulator = initialize_simulator()

        # 1. 刷新token
        print("刷新token...")
        simulator.login()

        # 2. 加载alpha列表
        print("加载alpha列表...")
        alpha_list = simulator.load_alpha_list()

        if not alpha_list:
            result = {
                "status": "no_data",
                "message": "数据库中没有待处理的alpha表达式",
                "timestamp": time.time()
            }
            _last_result = result
            return result

        # 3. 执行批量模拟
        print(f"共加载 {len(alpha_list)} 个需要模拟的因子表达式")
        success_count, fail_count = simulator.run_batch_simulation(alpha_list)

        result_message = f"处理完成: 成功 {success_count} 个, 失败 {fail_count} 个"
        print(result_message)

        result = {
            "status": "completed",
            "message": result_message,
            "data": {
                "alpha_count": len(alpha_list),
                "success_count": success_count,
                "fail_count": fail_count
            },
            "timestamp": time.time()
        }

        _last_result = result
        return result

    except Exception as e:
        error_msg = f"模拟执行失败: {str(e)}"
        print(error_msg)

        result = {
            "status": "error",
            "message": error_msg,
            "timestamp": time.time()
        }
        _last_result = result
        return result

    finally:
        _is_processing = False


@app.get("/result")
async def get_last_result():
    """获取上次执行的结果"""
    if _last_result is None:
        raise HTTPException(status_code=404, detail="暂无执行结果")

    return {
        "status": "success",
        "data": _last_result,
        "timestamp": time.time()
    }


@app.get("/status")
async def get_status():
    """获取服务状态"""
    return {
        "is_processing": _is_processing,
        "simulator_initialized": _simulator is not None,
        "has_last_result": _last_result is not None,
        "timestamp": time.time()
    }


@app.get("/health")
async def health_check():
    """健康检查端点"""
    return {
        "status": "healthy",
        "timestamp": time.time(),
        "simulator_initialized": _simulator is not None
    }


if __name__ == "__main__":
    import uvicorn

    # 首次初始化
    initialize_simulator()
    print("服务正在启动...")

    # 启动FastAPI服务
    uvicorn.run(
        app,
        host="0.0.0.0",
        port=8000,
        log_level="info"
    )