"""
定时任务服务
用于处理自动发放低保、自动封盘等定时任务
"""
import asyncio
from datetime import datetime, timedelta
from sqlalchemy.orm import Session
from ..core.database import get_db, SessionLocal
from ..models.user import User, Transaction
from ..models.game import Chest, ChestStatus
from ..services.user_service import UserService
from ..services.game_service import GameService
from ..core.config import settings

class SchedulerService:
    """定时任务服务"""
    
    @staticmethod
    async def start_scheduler():
        """
        启动定时任务调度器
        """
        # 创建后台任务运行定时器
        asyncio.create_task(SchedulerService._run_daily_allowance_scheduler())
        # 创建后台任务扫描过期宝箱
        asyncio.create_task(SchedulerService._run_expired_chest_scanner())
    
    @staticmethod
    async def _run_daily_allowance_scheduler():
        """
        运行每日低保发放调度器
        每天凌晨1点执行
        """
        while True:
            # 获取当前时间
            now = datetime.now()
            
            # 计算下次执行时间（明天凌晨1点）
            next_run = now.replace(hour=1, minute=0, second=0, microsecond=0) + timedelta(days=1)
            
            # 计算等待时间
            sleep_seconds = (next_run - now).total_seconds()
            
            # 等待到下次执行时间
            await asyncio.sleep(sleep_seconds)
            
            # 执行每日低保发放
            try:
                SchedulerService._distribute_daily_allowance()
            except Exception as e:
                print(f"每日低保发放失败: {e}")
    
    @staticmethod
    def _distribute_daily_allowance():
        """
        发放每日低保
        为所有余额低于低保门槛的用户发放低保
        """
        db_gen = get_db()
        db: Session = next(db_gen)
        
        try:
            # 获取所有余额低于低保门槛的活跃用户
            users = db.query(User).filter(
                User.balance < settings.game.ALLOWANCE_THRESHOLD,
                User.status == "ACTIVE"
            ).all()
            
            allowance_amount = settings.game.DAILY_ALLOWANCE
            
            success_count = 0
            for user in users:
                try:
                    # 检查用户是否满足领取条件
                    if SchedulerService._can_claim_allowance(db, user):
                        # 发放低保
                        user.balance += allowance_amount
                        
                        # 记录交易
                        transaction = Transaction(
                            user_id=user.id,
                            type="低保",
                            amount=allowance_amount,
                            balance_after=user.balance,
                            description="每日自动发放低保"
                        )
                        db.add(transaction)
                        
                        success_count += 1
                
                except Exception as e:
                    print(f"为用户 {user.username} 发放低保时出错: {e}")
                    continue
            
            # 提交事务
            db.commit()
            print(f"每日低保发放完成，成功为 {success_count} 名用户发放低保")
            
        except Exception as e:
            db.rollback()
            print(f"每日低保发放过程中出现错误: {e}")
        finally:
            # 关闭数据库连接
            db.close()
    
    @staticmethod
    def _can_claim_allowance(db: Session, user: User) -> bool:
        """
        检查用户是否可以领取低保
        """
        # 检查是否已领取过低保
        last_allowance = db.query(Transaction).filter(
            Transaction.user_id == user.id,
            Transaction.type == "低保"
        ).order_by(Transaction.created_at.desc()).first()
        
        # 如果从未领取过低保，则可以领取
        if not last_allowance:
            return True
            
        # 如果距离上次低保已经超过24小时，则可以领取
        time_since_last = datetime.now() - last_allowance.created_at
        return time_since_last >= timedelta(hours=24)

    @staticmethod
    async def _run_expired_chest_scanner():
        """
        运行过期宝箱扫描器
        每10秒扫描一次，自动锁定过期的宝箱
        """
        while True:
            try:
                # 扫描并锁定过期宝箱
                expired_count = SchedulerService._scan_and_lock_expired_chests()
                if expired_count > 0:
                    print(f"自动锁定 {expired_count} 个过期宝箱")
            except Exception as e:
                print(f"扫描过期宝箱时出错: {e}")

            # 每10秒扫描一次（比1秒更高效）
            await asyncio.sleep(10)

    @staticmethod
    def _scan_and_lock_expired_chests() -> int:
        """
        扫描并锁定所有过期的宝箱

        Returns:
            锁定宝箱的数量
        """
        db = SessionLocal()
        try:
            # 获取所有状态为下注中的宝箱
            chests = db.query(Chest).filter(
                Chest.status == ChestStatus.BETTING
            ).all()

            # 使用本地时间进行计算（与数据库func.now()保持一致）
            now = datetime.now()
            expired_count = 0
            expired_chest_ids = []

            for chest in chests:
                # 计算已过时间
                elapsed = (now - chest.created_at).total_seconds()

                # 检查是否过期（增加0.5秒容差）
                if elapsed >= chest.countdown_seconds - 0.5:
                    # 锁定宝箱
                    chest.status = ChestStatus.LOCKED
                    chest.locked_at = now
                    expired_count += 1
                    expired_chest_ids.append(chest.id)

            if expired_count > 0:
                db.commit()
                print(f"已自动锁定 {expired_count} 个过期宝箱: {expired_chest_ids}")

            return expired_count

        except Exception as e:
            db.rollback()
            print(f"锁定过期宝箱时出错: {e}")
            return 0
        finally:
            db.close()