# -*- 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
_is_processing = False
_token_expiry_time = 0  # token过期时间戳
_TOKEN_REFRESH_THRESHOLD = 1800  # 30分钟刷新阈值


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


def check_and_refresh_token():
    """检查并刷新token"""
    global _token_expiry_time, _simulator

    current_time = time.time()

    # 如果token即将过期（剩余时间少于30分钟），则刷新
    if current_time >= _token_expiry_time - _TOKEN_REFRESH_THRESHOLD:
        print("token即将过期，重新登录...")
        _simulator.login()

        # 更新token过期时间（假设token有效期14400秒）
        _token_expiry_time = current_time + 14400
        print(f"token已刷新，有效期至: {time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(_token_expiry_time))}")
        return True
    else:
        remaining = int(_token_expiry_time - current_time)
        print(f"token仍然有效，剩余时间: {remaining // 3600}小时{(remaining % 3600) // 60}分钟")
        return False


@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. 检查token并刷新
    2. 加载alpha列表
    3. 执行批量模拟
    """
    global _is_processing, _last_result, _simulator, _token_expiry_time

    # 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. 检查并刷新token（只在需要时）
        print("检查token状态...")
        if _token_expiry_time == 0:
            # 第一次运行，需要登录
            print("首次运行，进行登录...")
            simulator.login()
            _token_expiry_time = time.time() + 14400
            print("登录成功")
        else:
            check_and_refresh_token()

        # 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"""
    global _token_expiry_time

    token_valid = False
    if _token_expiry_time > 0:
        remaining_time = _token_expiry_time - time.time()
        token_valid = remaining_time > 0

    return {
        "status": "running",
        "is_processing": _is_processing,
        "simulator_initialized": _simulator is not None,
        "has_last_result": _last_result is not None,
        "token_valid": token_valid,
        "token_expires_in": int(_token_expiry_time - time.time()) if _token_expiry_time > 0 else 0,
        "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,
        "token_valid": _token_expiry_time > time.time() if _token_expiry_time > 0 else False
    }


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=8005,
        log_level="info"
    )