#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
小红书热门话题爬虫

基于 MediaCrawler 项目获取实时数据
需要先扫码登录

使用方式:
    crawler = XiaohongshuCrawler()
    await crawler.login()  # 扫码登录
    topics = await crawler.fetch()
"""

import logging
from typing import List, Optional, Dict
from datetime import datetime, timedelta
import asyncio

from .base import BaseCrawler
from ..models import HotTopic, HotTopicSource, HotTopicCategory

logger = logging.getLogger(__name__)

# 尝试导入 MediaCrawler 桥接器
try:
    from .mediacrawler import get_xhs_bridge, XHSCrawlerBridge
    MEDIACRAWLER_AVAILABLE = True
except ImportError:
    MEDIACRAWLER_AVAILABLE = False
    logger.warning("MediaCrawler 模块未加载，小红书爬虫不可用")


class XiaohongshuCrawler(BaseCrawler):
    """
    小红书热门话题爬虫
    
    基于 MediaCrawler 项目，需要先扫码登录
    """
    
    source = HotTopicSource.XIAOHONGSHU
    name = "小红书热门"
    
    # 搜索关键词 (文旅相关)
    SEARCH_KEYWORDS = [
        "旅游攻略", "周末去哪玩", "亲子游推荐", "自驾游路线",
        "网红打卡地", "小众景点", "酒店推荐", "民宿推荐",
        "冬季旅行", "滑雪攻略", "温泉度假",
    ]
    
    def __init__(self, keywords: List[str] = None):
        super().__init__()
        self._keywords = keywords or self.SEARCH_KEYWORDS
        self._xhs_bridge: Optional[XHSCrawlerBridge] = None
    
    @property
    def is_available(self) -> bool:
        """检查是否可用"""
        return MEDIACRAWLER_AVAILABLE
    
    async def login(self) -> bool:
        """
        扫码登录小红书
        
        Returns:
            是否成功
        """
        if not MEDIACRAWLER_AVAILABLE:
            self.logger.error("MediaCrawler 不可用，请检查 libs/MediaCrawler 目录")
            return False
        
        if not self._xhs_bridge:
            self._xhs_bridge = get_xhs_bridge()
        
        return await self._xhs_bridge.login()
    
    async def fetch(self) -> List[HotTopic]:
        """
        获取小红书热门话题
        
        通过搜索关键词获取相关笔记，统计热度
        """
        if not MEDIACRAWLER_AVAILABLE:
            self.logger.warning("MediaCrawler 不可用")
            return []
        
        topics = []
        
        try:
            # 获取桥接器
            if not self._xhs_bridge:
                self._xhs_bridge = get_xhs_bridge()
            
            if not self._xhs_bridge.is_available:
                self.logger.warning("MediaCrawler 不可用")
                return []
            
            # 搜索热门关键词
            for keyword in self._keywords:
                try:
                    notes = await self._xhs_bridge.search_notes(keyword, page_size=10)
                    
                    if notes:
                        # 计算热度 (基于互动数据)
                        total_likes = sum(int(n.get('liked_count', 0) or 0) for n in notes)
                        
                        topic = HotTopic(
                            title=keyword,
                            source=self.source,
                            rank=len(topics) + 1,
                            heat=total_likes,
                            category=HotTopicCategory.TRAVEL,
                            tags=[keyword],
                            description=f"相关笔记 {len(notes)} 篇，总点赞 {total_likes}",
                            fetched_at=datetime.now(),
                            expires_at=datetime.now() + timedelta(hours=1),
                            extra={
                                'notes_count': len(notes),
                                'sample_notes': notes[:3],
                            }
                        )
                        topics.append(topic)
                    
                    # 避免请求过快
                    await asyncio.sleep(1)
                    
                except Exception as e:
                    self.logger.warning(f"搜索 '{keyword}' 失败: {e}")
            
            # 按热度排序
            topics.sort(key=lambda x: x.heat or 0, reverse=True)
            
            # 更新排名
            for idx, t in enumerate(topics):
                t.rank = idx + 1
            
            self.logger.info(f"获取到 {len(topics)} 条小红书热门话题")
            
        except Exception as e:
            self.logger.error(f"获取小红书热门失败: {e}")
        
        return topics
    
    async def search_notes(self, keyword: str, page_size: int = 20) -> List[Dict]:
        """
        搜索笔记
        
        Args:
            keyword: 搜索关键词
            page_size: 每页数量
            
        Returns:
            笔记列表
        """
        if not MEDIACRAWLER_AVAILABLE:
            return []
        
        if not self._xhs_bridge:
            self._xhs_bridge = get_xhs_bridge()
        
        return await self._xhs_bridge.search_notes(keyword, page_size=page_size)
    
    async def get_note_detail(self, note_id: str) -> Optional[Dict]:
        """
        获取笔记详情
        
        Args:
            note_id: 笔记 ID
            
        Returns:
            笔记详情
        """
        if not MEDIACRAWLER_AVAILABLE:
            return None
        
        if not self._xhs_bridge:
            self._xhs_bridge = get_xhs_bridge()
        
        return await self._xhs_bridge.get_note_detail(note_id)