import asyncio
from loguru import logger
from typing import List, Dict, Optional
import signal
import sys
from concurrent.futures import ThreadPoolExecutor
import time
from asyncio import Semaphore

from config.settings import SYNC_CONFIG
from .position_sync import PositionSync
from .order_sync import OrderSync
from .account_sync import AccountSync

class SyncManager:
    """同步管理器（支持批量并发处理）"""
    
    def __init__(self):
        self.is_running = True
        self.sync_interval = SYNC_CONFIG['interval']
        self.max_concurrent = int(os.getenv('MAX_CONCURRENT', '10'))  # 最大并发数
        
        # 初始化同步器
        self.syncers = []
        self.executor = ThreadPoolExecutor(max_workers=self.max_concurrent)

        self.semaphore = Semaphore(self.max_concurrent)  # 控制并发数
        
        if SYNC_CONFIG['enable_position_sync']:
            self.syncers.append(PositionSync())
            logger.info("启用持仓同步")
        
        if SYNC_CONFIG['enable_order_sync']:
            self.syncers.append(OrderSync())
            logger.info("启用订单同步")
        
        if SYNC_CONFIG['enable_account_sync']:
            self.syncers.append(AccountSync())
            logger.info("启用账户信息同步")
        
        # 性能统计
        self.stats = {
            'total_accounts': 0,
            'success_count': 0,
            'error_count': 0,
            'last_sync_time': 0,
            'avg_sync_time': 0
        }
        
        # 注册信号处理器
        signal.signal(signal.SIGINT, self.signal_handler)
        signal.signal(signal.SIGTERM, self.signal_handler)

    async def _run_syncer_with_limit(self, syncer):
        """带并发限制的运行"""
        async with self.semaphore:
            return await self._run_syncer(syncer)
        
    def signal_handler(self, signum, frame):
        """信号处理器"""
        logger.info(f"接收到信号 {signum}，正在关闭...")
        self.is_running = False
    
    def batch_process_accounts(self, accounts: Dict[str, Dict], batch_size: int = 100):
        """分批处理账号"""
        account_items = list(accounts.items())
        
        for i in range(0, len(account_items), batch_size):
            batch = dict(account_items[i:i + batch_size])
            # 处理这批账号
            self._process_account_batch(batch)
            
            # 批次间休息，避免数据库压力过大
            time.sleep(0.1)

    async def start(self):
        """启动同步服务"""
        logger.info(f"同步服务启动，间隔 {self.sync_interval} 秒，最大并发 {self.max_concurrent}")
        
        while self.is_running:
            try:
                start_time = time.time()
                
                # 执行所有同步器
                tasks = [self._run_syncer(syncer) for syncer in self.syncers]
                results = await asyncio.gather(*tasks, return_exceptions=True)
                
                # 更新统计
                sync_time = time.time() - start_time
                self.stats['last_sync_time'] = sync_time
                self.stats['avg_sync_time'] = (self.stats['avg_sync_time'] * 0.9 + sync_time * 0.1)
                
                # 打印统计信息
                self._print_stats()
                
                logger.debug(f"同步完成，耗时 {sync_time:.2f} 秒，等待 {self.sync_interval} 秒")
                await asyncio.sleep(self.sync_interval)
                
            except asyncio.CancelledError:
                logger.info("同步任务被取消")
                break
            except Exception as e:
                logger.error(f"同步任务异常: {e}")
                self.stats['error_count'] += 1
                await asyncio.sleep(30)  # 出错后等待30秒
    
    async def _run_syncer(self, syncer):
        """运行单个同步器"""
        try:
            # 获取所有账号
            accounts = syncer.get_accounts_from_redis()
            self.stats['total_accounts'] = len(accounts)
            
            if not accounts:
                logger.warning("未获取到任何账号")
                return
            
            # 批量处理账号
            await syncer.sync_batch(accounts)
            self.stats['success_count'] += 1
            
        except Exception as e:
            logger.error(f"同步器 {syncer.__class__.__name__} 执行失败: {e}")
            self.stats['error_count'] += 1
    
    def _print_stats(self):
        """打印统计信息"""
        stats_str = (
            f"统计: 账号数={self.stats['total_accounts']}, "
            f"成功={self.stats['success_count']}, "
            f"失败={self.stats['error_count']}, "
            f"本次耗时={self.stats['last_sync_time']:.2f}s, "
            f"平均耗时={self.stats['avg_sync_time']:.2f}s"
        )
        logger.info(stats_str)
    
    async def stop(self):
        """停止同步服务"""
        self.is_running = False
        self.executor.shutdown(wait=True)
        logger.info("同步服务停止")