# backend/app/services/quality_monitor.py
"""
数据质量监控服务
支持完整性、准确性、及时性、一致性四维监控，问题发现<1分钟
"""

import asyncio
from typing import Dict, List, Optional
from datetime import datetime, timedelta
from enum import Enum
from sqlalchemy.orm import Session
from sqlalchemy import func, and_
from app.models.kline import Kline
from app.services.cache_service import cache_service
from app.config import settings
import logging

logger = logging.getLogger(__name__)


class QualityMetric(str, Enum):
    """质量指标"""
    COMPLETENESS = "completeness"  # 完整性
    ACCURACY = "accuracy"  # 准确性
    TIMELINESS = "timeliness"  # 及时性
    CONSISTENCY = "consistency"  # 一致性


class QualityLevel(str, Enum):
    """告警级别"""
    INFO = "info"  # 信息
    WARNING = "warning"  # 警告
    CRITICAL = "critical"  # 严重


class QualityMonitor:
    """
    数据质量监控服务
    
    功能:
    - 完整性检测（数据缺失）
    - 准确性检测（价格异常）
    - 及时性检测（数据延迟）
    - 一致性检测（缓存 vs 数据库）
    - 质量评分计算
    - 告警触发
    
    性能优化:
    - 定时检测（每分钟）
    - 批量检测
    - 结果缓存
    """
    
    def __init__(self):
        # 质量评分缓存 (symbol -> scores)
        self.quality_scores: Dict[str, Dict[str, float]] = {}
        
        # 问题列表
        self.quality_issues: List[dict] = []
        
        # 检测统计
        self.total_checks = 0
        self.total_issues = 0
    
    async def check_completeness(self, db: Session, symbol: str, period: str = "1m") -> float:
        """
        检查完整性
        
        Args:
            db: 数据库会话
            symbol: 品种代码
            period: 周期
        
        Returns:
            float: 完整性评分（0-100）
        """
        try:
            # 获取应到数据量（最近 7 天）
            start_time = datetime.now() - timedelta(days=7)
            
            # 计算预期数量（根据周期）
            if period == "1m":
                # 每分钟一条，交易时间每天约 4 小时 = 240 条/天
                expected_per_day = 240
            elif period == "5m":
                expected_per_day = 48
            elif period == "15m":
                expected_per_day = 16
            elif period == "30m":
                expected_per_day = 8
            elif period == "60m":
                expected_per_day = 4
            elif period == "1d":
                expected_per_day = 1
            elif period == "1w":
                expected_per_day = 0.14  # 每周一条
            else:
                expected_per_day = 240
            
            # 交易天数（假设每周 5 天）
            trading_days = 5
            expected_count = expected_per_day * trading_days
            
            # 获取实际数量
            actual_count = db.query(func.count(Kline.id)).filter(
                and_(
                    Kline.symbol == symbol,
                    Kline.period == period,
                    Kline.time >= start_time
                )
            ).scalar()
            
            # 计算完整性评分
            if expected_count == 0:
                return 100.0
            
            completeness = (actual_count / expected_count) * 100
            completeness = min(completeness, 100.0)  # 上限 100
            
            # 记录问题
            if completeness < 80:
                await self._record_issue(
                    symbol, QualityMetric.COMPLETENESS,
                    completeness, 80,
                    QualityLevel.WARNING,
                    f"数据完整性不足：预期 {expected_count} 条，实际 {actual_count} 条"
                )
            
            return completeness
        
        except Exception as e:
            logger.error(f"❌ 完整性检测失败: {e}")
            return 0.0
    
    async def check_accuracy(self, db: Session, symbol: str) -> float:
        """
        检查准确性
        
        Args:
            db: 数据库会话
            symbol: 品种代码
        
        Returns:
            float: 准确性评分（0-100）
        """
        try:
            # 获取最近 7 天数据
            start_time = datetime.now() - timedelta(days=7)
            
            # 检测价格异常（涨跌幅 > 10%）
            abnormal_count = db.query(func.count(Kline.id)).filter(
                and_(
                    Kline.symbol == symbol,
                    abs(Kline.change_percent) > 10,
                    Kline.time >= start_time
                )
            ).scalar()
            
            # 获取总数
            total_count = db.query(func.count(Kline.id)).filter(
                and_(
                    Kline.symbol == symbol,
                    Kline.time >= start_time
                )
            ).scalar()
            
            if total_count == 0:
                return 100.0
            
            # 计算准确性评分
            accuracy = (1 - abnormal_count / total_count) * 100
            accuracy = max(accuracy, 0.0)  # 下限 0
            
            # 记录问题
            if accuracy < 95:
                await self._record_issue(
                    symbol, QualityMetric.ACCURACY,
                    accuracy, 95,
                    QualityLevel.WARNING,
                    f"数据准确性不足：发现 {abnormal_count} 条异常数据"
                )
            
            return accuracy
        
        except Exception as e:
            logger.error(f"❌ 准确性检测失败: {e}")
            return 0.0
    
    async def check_timeliness(self, db: Session, symbol: str, period: str = "1m") -> float:
        """
        检查及时性
        
        Args:
            db: 数据库会话
            symbol: 品种代码
            period: 周期
        
        Returns:
            float: 及时性评分（0-100）
        """
        try:
            # 获取最新数据时间
            latest = db.query(Kline).filter(
                and_(
                    Kline.symbol == symbol,
                    Kline.period == period
                )
            ).order_by(Kline.time.desc()).first()
            
            if not latest:
                await self._record_issue(
                    symbol, QualityMetric.TIMELINESS,
                    0, 80,
                    QualityLevel.CRITICAL,
                    f"无 {period} 周期数据"
                )
                return 0.0
            
            # 计算延迟
            delay = (datetime.now() - latest.time).total_seconds()
            
            # 预期延迟（根据周期）
            if period == "1m":
                expected_delay = 60  # 1 分钟
            elif period == "5m":
                expected_delay = 300  # 5 分钟
            elif period == "15m":
                expected_delay = 900  # 15 分钟
            elif period == "30m":
                expected_delay = 1800  # 30 分钟
            elif period == "60m":
                expected_delay = 3600  # 1 小时
            elif period == "1d":
                expected_delay = 86400  # 1 天
            else:
                expected_delay = 60
            
            # 计算及时性评分
            if delay <= expected_delay:
                timeliness = 100.0
            else:
                # 延迟越久，评分越低
                excess_delay = delay - expected_delay
                timeliness = max(0, 100 - excess_delay / 60)  # 每分钟扣 1 分
            
            # 记录问题
            if timeliness < 80:
                level = QualityLevel.WARNING if timeliness > 50 else QualityLevel.CRITICAL
                await self._record_issue(
                    symbol, QualityMetric.TIMELINESS,
                    timeliness, 80,
                    level,
                    f"数据延迟：最新数据时间为 {latest.time.strftime('%Y-%m-%d %H:%M:%S')}, 延迟 {delay:.0f} 秒"
                )
            
            return timeliness
        
        except Exception as e:
            logger.error(f"❌ 及时性检测失败: {e}")
            return 0.0
    
    async def check_consistency(self, db: Session, symbol: str) -> float:
        """
        检查一致性（缓存 vs 数据库）
        
        Args:
            db: 数据库会话
            symbol: 品种代码
        
        Returns:
            float: 一致性评分（0-100）
        """
        try:
            # 从缓存获取最新行情
            cache_data = await cache_service.get_latest_quote(symbol)
            
            # 从数据库获取最新行情（简化：从 Kline 表）
            latest = db.query(Kline).filter(
                Kline.symbol == symbol
            ).order_by(Kline.time.desc()).first()
            
            if not cache_data or not latest:
                return 100.0  # 缺少数据时默认一致
            
            # 比较价格
            cache_price = float(cache_data.get("price", 0))
            db_price = float(latest.close)
            
            # 允许微小误差（0.01%）
            if abs(cache_price - db_price) / max(db_price, 1) < 0.0001:
                return 100.0
            
            # 不一致
            await self._record_issue(
                symbol, QualityMetric.CONSISTENCY,
                0, 100,
                QualityLevel.WARNING,
                f"缓存与数据库不一致：缓存价格 {cache_price}, 数据库价格 {db_price}"
            )
            
            return 0.0
        
        except Exception as e:
            logger.error(f"❌ 一致性检测失败: {e}")
            return 0.0
    
    async def calculate_overall_score(self, db: Session, symbol: str) -> Dict[str, float]:
        """
        计算总体评分
        
        Args:
            db: 数据库会话
            symbol: 品种代码
        
        Returns:
            Dict[str, float]: 各项评分
        """
        # 计算各项指标
        completeness = await self.check_completeness(db, symbol, "1m")
        accuracy = await self.check_accuracy(db, symbol)
        timeliness = await self.check_timeliness(db, symbol, "1m")
        consistency = await self.check_consistency(db, symbol)
        
        # 总体评分（平均）
        overall = (completeness + accuracy + timeliness + consistency) / 4
        
        # 缓存结果
        self.quality_scores[symbol] = {
            "completeness": completeness,
            "accuracy": accuracy,
            "timeliness": timeliness,
            "consistency": consistency,
            "overall": overall,
            "time": datetime.now().isoformat()
        }
        
        return self.quality_scores[symbol]
    
    async def check_all_symbols(self, db: Session) -> Dict[str, Dict[str, float]]:
        """
        检查所有品种
        
        Args:
            db: 数据库会话
        
        Returns:
            Dict[str, Dict[str, float]]: 各品种评分
        """
        # 获取所有品种
        symbols = db.query(Kline.symbol).distinct().all()
        symbols = [s[0] for s in symbols]
        
        results = {}
        for symbol in symbols:
            scores = await self.calculate_overall_score(db, symbol)
            results[symbol] = scores
            self.total_checks += 1
        
        return results
    
    async def _record_issue(
        self,
        symbol: str,
        metric: QualityMetric,
        value: float,
        threshold: float,
        level: QualityLevel,
        message: str
    ):
        """
        记录质量问题
        
        Args:
            symbol: 品种代码
            metric: 质量指标
            value: 实际值
            threshold: 阈值
            level: 告警级别
            message: 详细信息
        """
        issue = {
            "symbol": symbol,
            "metric": metric.value,
            "value": value,
            "threshold": threshold,
            "level": level.value,
            "message": message,
            "time": datetime.now().isoformat()
        }
        
        self.quality_issues.append(issue)
        self.total_issues += 1
        
        logger.warning(f"⚠️ 数据质量问题: {message}")
    
    def get_issues(self, limit: int = 100) -> List[dict]:
        """
        获取问题列表
        
        Args:
            limit: 最大数量
        
        Returns:
            List[dict]: 问题列表
        """
        return self.quality_issues[-limit:]
    
    def get_statistics(self) -> dict:
        """获取统计信息"""
        return {
            "total_checks": self.total_checks,
            "total_issues": self.total_issues,
            "cached_symbols": len(self.quality_scores),
        }


# 全局质量监控实例
quality_monitor = QualityMonitor()


# ============== 定时任务 ==============

async def quality_check_task(db: Session):
    """
    数据质量检查定时任务
    
    每分钟执行一次
    """
    logger.info("🔄 QualityMonitor 开始检查...")
    
    # 检查所有品种
    results = await quality_monitor.check_all_symbols(db)
    
    # 统计问题数量
    total_issues = len(quality_monitor.quality_issues)
    
    logger.info(f"📊 QualityMonitor 检查完成: 检查 {len(results)} 个品种, 发现 {total_issues} 个问题")
    
    return results