"""
股票数据服务 - 获取、缓存、分析
"""
import pandas as pd
import numpy as np
from datetime import datetime, timedelta
import traceback
import json
import os
from config import Config


# ========== 股票名称缓存 ==========
_stock_name_cache = {}


def _load_stock_name_cache():
    """从本地文件加载股票名称缓存"""
    global _stock_name_cache
    try:
        if os.path.exists(Config.STOCK_NAME_CACHE_FILE):
            with open(Config.STOCK_NAME_CACHE_FILE, 'r', encoding='utf-8') as f:
                _stock_name_cache = json.load(f)
                print(f"加载股票名称缓存：{len(_stock_name_cache)}条")
    except Exception as e:
        print(f"加载股票名称缓存失败: {e}")


def _save_stock_name_cache():
    """保存股票名称缓存到本地"""
    try:
        with open(Config.STOCK_NAME_CACHE_FILE, 'w', encoding='utf-8') as f:
            json.dump(_stock_name_cache, f, ensure_ascii=False, indent=2)
    except Exception as e:
        print(f"保存股票名称缓存失败: {e}")


def get_stock_name(stock_code):
    """获取股票名称 — 使用腾讯财经API"""
    global _stock_name_cache
    
    if stock_code in _stock_name_cache:
        return _stock_name_cache[stock_code]
    
    # 腾讯财经API获取股票名称
    try:
        import requests as _req
        tcode = ('sh' if stock_code.startswith('6') else 'sz') + stock_code
        _r = _req.get(f'http://qt.gtimg.cn/q={tcode}', timeout=5,
                      headers={'Referer': 'https://finance.qq.com'})
        if _r.status_code == 200 and '\"' in _r.text:
            _fields = _r.text.split('\"')[1].split('~')
            if len(_fields) > 2 and _fields[1]:
                _stock_name_cache[stock_code] = _fields[1]
                _save_stock_name_cache()
                return _fields[1]
    except Exception as e:
        print(f"获取股票名称失败(腾讯): {e}")
    
    return None


# ========== 股票数据缓存 ==========

def _get_cache_file_path(stock_code):
    """获取缓存文件路径"""
    return os.path.join(Config.STOCK_DATA_CACHE_DIR, f'{stock_code}.json')


def load_cached_data(stock_code):
    """加载缓存的股票数据"""
    cache_file = _get_cache_file_path(stock_code)
    if os.path.exists(cache_file):
        try:
            with open(cache_file, 'r', encoding='utf-8') as f:
                data = json.load(f)
                df = pd.DataFrame(data['records'])
                if not df.empty and '日期' in df.columns:
                    df['日期'] = pd.to_datetime(df['日期'])
                return df, data.get('stock_name'), data.get('last_update')
        except Exception as e:
            print(f"加载缓存数据失败: {e}")
    return None, None, None


def save_cached_data(stock_code, df, stock_name):
    """保存股票数据到缓存"""
    cache_file = _get_cache_file_path(stock_code)
    try:
        df_copy = df.copy()
        df_copy['日期'] = df_copy['日期'].dt.strftime('%Y-%m-%d')
        records = df_copy.to_dict('records')
        
        data = {
            'stock_code': stock_code,
            'stock_name': stock_name,
            'last_update': datetime.now().strftime('%Y-%m-%d %H:%M:%S'),
            'records': records
        }
        
        with open(cache_file, 'w', encoding='utf-8') as f:
            json.dump(data, f, ensure_ascii=False, indent=2)
        print(f"已保存 {stock_code} 数据，共 {len(records)} 条")
    except Exception as e:
        print(f"保存缓存数据失败: {e}")


# ========== 获取股票资金流向数据 ==========

def get_stock_fund_flow(stock_code, start_date, end_date, force_refresh=False):
    """
    获取股票资金流向数据（支持缓存，增量获取）
    force_refresh: 强制刷新缓存
    返回: (DataFrame, stock_name, error_msg)
    """
    try:
        # 判断市场
        if stock_code.startswith('6'):
            market = 'sh'
        elif stock_code.startswith('0') or stock_code.startswith('3'):
            market = 'sz'
        else:
            return None, None, "无法识别股票代码所属市场"
        
        stock_name = get_stock_name(stock_code)
        start = pd.to_datetime(start_date)
        end = pd.to_datetime(end_date)
        
        # 加载缓存
        cached_df, cached_name, last_update = load_cached_data(stock_code)
        need_fetch = force_refresh
        new_data_df = None
        
        if cached_df is not None and not cached_df.empty:
            # 如果缓存是今天的，直接使用
            if last_update:
                try:
                    update_date = pd.to_datetime(last_update.split()[0])
                    today = pd.to_datetime(datetime.now().strftime('%Y-%m-%d'))
                    if update_date >= today and not force_refresh:
                        # 今天已更新，直接使用缓存
                        df = cached_df[(cached_df['日期'] >= start) & (cached_df['日期'] <= end)]
                        df = df.sort_values('日期').reset_index(drop=True)
                        return df, cached_name or stock_name, None
                except:
                    pass
            cached_max_date = cached_df['日期'].max()
            today = pd.to_datetime(datetime.now().strftime('%Y-%m-%d'))
            
            # 如果缓存数据不超过2天，直接使用（优化分析速度）
            if cached_max_date >= today - timedelta(days=2) and not force_refresh:
                if cached_df['日期'].min() <= start:
                    need_fetch = False
                    new_data_df = cached_df
                    print(f"使用缓存数据: {stock_code}, 最新日期: {cached_max_date.strftime('%Y-%m-%d')}")
            
            if stock_name is None and cached_name:
                stock_name = cached_name
        
        if need_fetch:
            # 东方财富资金流向API已不可用(腾讯云网络限制)，使用缓存数据
            print(f"资金流向API不可用，使用缓存: {stock_code}")
            if cached_df is not None:
                new_data_df = cached_df
            else:
                return None, None, "资金流向API不可用(东方财富已封锁)，且无缓存数据"
        
        if new_data_df is None or new_data_df.empty:
            # 最后尝试使用缓存数据（即使不在日期范围内）
            if cached_df is not None and not cached_df.empty:
                print(f"使用全部缓存数据: {stock_code}")
                df = cached_df.sort_values('日期').reset_index(drop=True)
                return df, cached_name or stock_name, None
            return None, None, "无法获取数据"
        
        # 筛选日期范围
        df = new_data_df[(new_data_df['日期'] >= start) & (new_data_df['日期'] <= end)]
        
        # 如果筛选后为空，使用全部数据
        if df.empty and not new_data_df.empty:
            print(f"日期范围无数据，使用全部缓存: {stock_code}")
            df = new_data_df
        
        df = df.sort_values('日期').reset_index(drop=True)
        
        return df, stock_name, None
    except Exception as e:
        traceback.print_exc()
        return None, None, f"获取数据失败: {str(e)}"


# ========== 分析股票数据 ==========

def analyze_fund_flow_impact(df):
    """分析资金流向对股价的影响（含成交量分析）"""
    if df is None or df.empty:
        return None
    
    df = df.sort_values('日期').reset_index(drop=True)
    threshold = 2.0
    
    if '超大单净流入-净占比' not in df.columns:
        return None
    
    df['超大单净流入-净占比'] = df['超大单净流入-净占比'].fillna(0)
    df['主力净流入-净占比'] = df['主力净流入-净占比'].fillna(0)
    
    df['超大单流向'] = df['超大单净流入-净占比'].apply(
        lambda x: '大额流入' if x >= threshold else ('大额流出' if x <= -threshold else '普通')
    )
    df['主力流向'] = df['主力净流入-净占比'].apply(
        lambda x: '大额流入' if x >= threshold else ('大额流出' if x <= -threshold else '普通')
    )
    
    # 计算价格位置（改为60日）
    latest = df.iloc[-1]
    lookback = 60  # 从20日改为60日
    try:
        actual_lookback = min(len(df), lookback)
        if actual_lookback >= 5:  # 至少需要5天数据
            recent = df.tail(actual_lookback)
            high = float(recent['收盘价'].max() or 0)
            low = float(recent['收盘价'].min() or 0)
            current_price = float(latest.get('收盘价') or 0)
            price_position = (current_price - low) / (high - low) * 100 if high != low else 50
        else:
            price_position = 50
    except:
        price_position = 50
    
    # 成交量分析（基于主力净流入-净额作为成交额指标）
    volume_ratio = 1.0  # 默认值
    volume_trend = '普通'
    try:
        if '主力净流入-净额' in df.columns and len(df) >= 10:
            # 使用主力净流入绝对值作为活跃度指标
            df['活跃度'] = df['主力净流入-净额'].abs()
            recent_5 = df.tail(5)['活跃度'].mean()
            recent_20 = df.tail(min(20, len(df)))['活跃度'].mean()
            
            if recent_20 > 0:
                volume_ratio = recent_5 / recent_20
                if volume_ratio >= 1.5:
                    volume_trend = '放量'
                elif volume_ratio <= 0.5:
                    volume_trend = '缩量'
                else:
                    volume_trend = '正常'
    except:
        pass
    
    # 计算均线MA5和MA20
    ma5 = 0
    ma20 = 0
    try:
        if '收盘价' in df.columns and len(df) >= 5:
            ma5 = df.tail(5)['收盘价'].mean()
        if '收盘价' in df.columns and len(df) >= 20:
            ma20 = df.tail(20)['收盘价'].mean()
    except:
        pass
    
    # 处理日期格式（可能是datetime或字符串）
    def format_date(d):
        if hasattr(d, 'strftime'):
            return d.strftime('%Y-%m-%d')
        return str(d)[:10] if d else ''
    
    def safe_float(val, default=0):
        try:
            return float(val) if val is not None else default
        except:
            return default
    
    return {
        '最新数据': {
            '日期': format_date(latest['日期']),
            '收盘价': safe_float(latest.get('收盘价')),
            '涨跌幅': safe_float(latest.get('涨跌幅')),
            '价格位置': safe_float(price_position),
            '超大单净流入占比': safe_float(latest.get('超大单净流入-净占比')),
            '主力净流入占比': safe_float(latest.get('主力净流入-净占比')),
            '超大单流向': latest.get('超大单流向', '普通'),
            '主力流向': latest.get('主力流向', '普通'),
            '成交量比': safe_float(volume_ratio, 1.0),
            '量能趋势': volume_trend,
            'MA5': safe_float(ma5),
            'MA20': safe_float(ma20)
        },
        '数据概览': {
            '总交易日数': len(df),
            '计算周期': min(len(df), lookback),
            '日期范围': {
                '开始': format_date(df['日期'].min()),
                '结束': format_date(df['日期'].max())
            }
        }
    }


# ========== 实时价格 ==========

def get_realtime_price(stock_code):
    """获取实时价格（使用mairuiapi，更稳定）"""
    try:
        from services.mairui_api import get_realtime_price as mairui_get_price
        result = mairui_get_price(stock_code)
        if result['success']:
            return result
    except Exception as e:
        print(f"mairuiapi获取实时价格失败({stock_code}): {e}")
    
    # 备用方案2：使用腾讯财经API（腾讯云可用）
    try:
        import requests as _req
        tcode = ('sh' if stock_code.startswith('6') else 'sz') + stock_code
        _r = _req.get(f'http://qt.gtimg.cn/q={tcode}', timeout=5,
                      headers={'Referer': 'https://finance.qq.com'})
        if _r.status_code == 200 and '\"' in _r.text:
            _fields = _r.text.split('\"')[1].split('~')
            if len(_fields) > 35 and _fields[3]:
                return {
                    'success': True,
                    'data': {
                        'code': stock_code,
                        'name': _fields[1],
                        'price': float(_fields[3]),
                        'change': float(_fields[32]) if _fields[32] else 0,
                    }
                }
    except Exception as e:
        print(f"腾讯财经备用方案失败({stock_code}): {e}")
    
    return {'success': False, 'error': '获取失败'}


def get_realtime_prices_batch(stock_codes):
    """批量获取实时价格"""
    try:
        from services.mairui_api import get_realtime_prices_batch as mairui_batch
        return mairui_batch(stock_codes)
    except Exception as e:
        print(f"mairuiapi批量获取失败: {e}")
    
    return {}


# ========== 热门股票 ==========

def get_hot_stocks(limit=100):
    """获取热门股票 — 东方财富API已不可用，返回空"""
    # stock_hot_rank_em 为东方财富API，已在腾讯云被封锁
    return []


# 初始化时加载缓存
_load_stock_name_cache()