import re
import json
import logging
from typing import Dict, List, Optional, Any
from urllib.parse import urlencode, quote

from .base import BaseCrawler
from utils.helpers import clean_price, parse_sales_volume


class JdCrawler(BaseCrawler):
    """
    京东平台爬虫
    注意：京东有较强的反爬机制，可能需要配置 Cookie 或使用代理
    """
    
    platform = 'jd'
    
    def __init__(self, cookie: str = None, proxy: str = None):
        """
        初始化京东爬虫
        :param cookie: 京东登录后的 Cookie 字符串
        :param proxy: 代理服务器地址
        """
        super().__init__()
        self.cookie = cookie
        self.proxy = proxy
        
        if cookie:
            self.headers['Cookie'] = cookie
        
        if proxy:
            self.session.proxies = {
                'http': proxy,
                'https': proxy
            }
    
    def search(self, keyword: str, page: int = 1, sort: str = 'sort_totalsales15_desc', **kwargs) -> List[Dict[str, Any]]:
        """
        搜索京东商品
        :param keyword: 搜索关键词
        :param page: 页码，从1开始
        :param sort: 排序方式: 
            - sort_totalsales15_desc (销量)
            - sort_price_asc (价格升序)
            - sort_price_desc (价格降序)
            - sort_discount_desc (折扣)
            - sort_totalsales15_desc (销量)
        :return: 商品列表
        """
        self.logger.info(f"搜索京东商品: keyword={keyword}, page={page}")
        
        params = {
            'keyword': keyword,
            'wq': keyword,
            'pvid': self._generate_pvid(),
            'page': page,
            's': (page - 1) * 30 + 1,
        }
        
        if sort and sort != 'default':
            params['psort'] = sort
        
        search_url = f"{self.config.get('search_url')}?{urlencode(params)}"
        
        self.logger.debug(f"搜索URL: {search_url}")
        
        response = self._make_request('GET', search_url)
        
        if not response:
            self.logger.warning(f"搜索请求失败: {keyword}")
            return []
        
        products = self._parse_search_result(response.text, search_url)
        
        if products:
            self._fill_product_prices(products)
        
        self.logger.info(f"从搜索结果中解析到 {len(products)} 个商品")
        
        return products
    
    def _generate_pvid(self) -> str:
        """
        生成京东 pvid
        """
        import time
        import random
        timestamp = int(time.time() * 1000)
        random_num = random.randint(100000, 999999)
        return f"{timestamp}{random_num}"
    
    def _parse_search_result(self, html: str, source_url: str) -> List[Dict[str, Any]]:
        """
        解析京东搜索结果页面
        """
        products = []
        
        item_pattern = r'<li[^>]*data-sku="(\d+)"[^>]*>(.*?)</li>'
        items = re.findall(item_pattern, html, re.DOTALL | re.IGNORECASE)
        
        self.logger.debug(f"找到 {len(items)} 个商品项")
        
        for sku_id, item_html in items:
            try:
                product = self._parse_item_html(sku_id, item_html, source_url)
                if product:
                    products.append(product)
            except Exception as e:
                self.logger.error(f"解析商品失败: {e}")
                continue
        
        if not products:
            products = self._parse_from_json(html, source_url)
        
        return products
    
    def _parse_item_html(self, sku_id: str, item_html: str, source_url: str) -> Optional[Dict[str, Any]]:
        """
        解析单个商品HTML
        """
        try:
            title_match = re.search(r'<div[^>]*class="p-name[^"]*"[^>]*>.*?<a[^>]*>(.*?)</a>', item_html, re.DOTALL | re.IGNORECASE)
            title = ''
            if title_match:
                title = title_match.group(1)
                title = re.sub(r'<[^>]+>', '', title).strip()
                title = re.sub(r'\s+', ' ', title)
            
            if not title:
                return None
            
            price_match = re.search(r'<div[^>]*class="p-price[^"]*"[^>]*>.*?<i[^>]*>([\d.]*)</i>', item_html, re.DOTALL | re.IGNORECASE)
            price = clean_price(price_match.group(1)) if price_match else 0
            
            shop_match = re.search(r'<div[^>]*class="p-shop[^"]*"[^>]*>.*?<a[^>]*>(.*?)</a>', item_html, re.DOTALL | re.IGNORECASE)
            shop_name = ''
            if shop_match:
                shop_name = shop_match.group(1)
                shop_name = re.sub(r'<[^>]+>', '', shop_name).strip()
            
            sales_match = re.search(r'<div[^>]*class="p-commit[^"]*"[^>]*>.*?<a[^>]*>([^<]+)</a>', item_html, re.DOTALL | re.IGNORECASE)
            sales_str = sales_match.group(1) if sales_match else ''
            sales_volume = parse_sales_volume(sales_str)
            
            img_match = re.search(r'<div[^>]*class="p-img[^"]*"[^>]*>.*?<img[^>]*data-lazy-img="([^"]+)"', item_html, re.DOTALL | re.IGNORECASE) or \
                       re.search(r'<div[^>]*class="p-img[^"]*"[^>]*>.*?<img[^>]*src="([^"]+)"', item_html, re.DOTALL | re.IGNORECASE)
            img_url = img_match.group(1) if img_match else ''
            if img_url and not img_url.startswith('http'):
                img_url = 'https:' + img_url
            
            detail_url = f"https://item.jd.com/{sku_id}.html"
            
            is_self = '京东自营' in shop_name or 'p-icons' in item_html and '自营' in item_html
            
            return {
                'product_id': str(sku_id),
                'name': title,
                'price': price,
                'image_url': img_url,
                'url': detail_url,
                'shop_name': shop_name,
                'sales_volume': sales_volume,
                'is_jd_self': is_self,
                'source_url': source_url,
                'is_wholesale': False,
                'currency': 'CNY'
            }
            
        except Exception as e:
            self.logger.error(f"解析商品HTML失败: {e}")
            return None
    
    def _parse_from_json(self, html: str, source_url: str) -> List[Dict[str, Any]]:
        """
        从页面中的 JSON 数据解析商品
        """
        products = []
        
        json_pattern = r'window\.__SEARCH_RESULT__\s*=\s*({.*?});'
        json_match = re.search(json_pattern, html, re.DOTALL)
        
        if json_match:
            try:
                data = json.loads(json_match.group(1))
                items = data.get('wareList', {}).get('wareInfo', [])
                
                for item in items:
                    product = self._parse_json_item(item, source_url)
                    if product:
                        products.append(product)
                        
            except json.JSONDecodeError as e:
                self.logger.error(f"解析JSON失败: {e}")
        
        return products
    
    def _parse_json_item(self, item: Dict, source_url: str) -> Optional[Dict[str, Any]]:
        """
        解析 JSON 格式的商品数据
        """
        try:
            sku_id = item.get('wname', '') or item.get('wareId', '')
            if not sku_id:
                return None
            
            title = item.get('wname', '').strip()
            if not title:
                return None
            
            price = clean_price(str(item.get('price', '0')))
            original_price = clean_price(str(item.get('oprice', '0'))) or None
            
            img_url = item.get('imgurl', '')
            if img_url and not img_url.startswith('http'):
                img_url = 'https:' + img_url
            
            shop_name = item.get('goodShop', {}).get('shopName', '') if item.get('goodShop') else ''
            
            sales_str = item.get('reviews', '')
            sales_volume = parse_sales_volume(sales_str)
            
            detail_url = f"https://item.jd.com/{sku_id}.html"
            
            return {
                'product_id': str(sku_id),
                'name': title,
                'price': price,
                'original_price': original_price,
                'image_url': img_url,
                'url': detail_url,
                'shop_name': shop_name,
                'sales_volume': sales_volume,
                'source_url': source_url,
                'is_wholesale': False,
                'currency': 'CNY'
            }
            
        except Exception as e:
            self.logger.error(f"解析JSON商品失败: {e}")
            return None
    
    def _fill_product_prices(self, products: List[Dict[str, Any]]):
        """
        批量获取商品价格（京东价格接口）
        """
        if not products:
            return
        
        sku_ids = [p.get('product_id') for p in products if p.get('product_id') and p.get('price', 0) <= 0]
        
        if not sku_ids:
            return
        
        self.logger.debug(f"批量获取 {len(sku_ids)} 个商品的价格")
        
        sku_str = ','.join([f'J_{sku}' for sku in sku_ids])
        price_url = f"https://p.3.cn/prices/mgets?skuIds={sku_str}&type=1"
        
        response = self._make_request('GET', price_url, headers={
            'Referer': 'https://www.jd.com'
        })
        
        if response:
            try:
                price_data = response.json()
                price_map = {}
                for item in price_data:
                    sku = item.get('id', '').replace('J_', '')
                    price = clean_price(item.get('p', '0'))
                    original_price = clean_price(item.get('op', '0')) or None
                    price_map[sku] = {'price': price, 'original_price': original_price}
                
                for product in products:
                    sku = product.get('product_id')
                    if sku in price_map:
                        if product.get('price', 0) <= 0:
                            product['price'] = price_map[sku]['price']
                        if not product.get('original_price'):
                            product['original_price'] = price_map[sku]['original_price']
                            
            except json.JSONDecodeError as e:
                self.logger.error(f"解析价格数据失败: {e}")
    
    def get_product_detail(self, product_id: str, **kwargs) -> Optional[Dict[str, Any]]:
        """
        获取京东商品详情
        :param product_id: 商品ID (sku)
        :return: 商品详情
        """
        self.logger.info(f"获取京东商品详情: product_id={product_id}")
        
        detail_url = f"https://item.jd.com/{product_id}.html"
        
        response = self._make_request('GET', detail_url)
        
        if not response:
            self.logger.warning(f"获取商品详情失败: {product_id}")
            return None
        
        return self._parse_product_detail(response.text, product_id, detail_url)
    
    def _parse_product_detail(self, html: str, product_id: str, source_url: str) -> Optional[Dict[str, Any]]:
        """
        解析商品详情页面
        """
        try:
            title_match = re.search(r'<title>([^<]+)</title>', html) or \
                         re.search(r'<div[^>]*class="sku-name[^"]*"[^>]*>(.*?)</div>', html, re.DOTALL | re.IGNORECASE)
            title = ''
            if title_match:
                title = title_match.group(1)
                title = re.sub(r'<[^>]+>', '', title).strip()
                title = title.split('-')[0].strip() if '-' in title else title
            
            shop_match = re.search(r'<div[^>]*class="name[^"]*"[^>]*>.*?<a[^>]*>(.*?)</a>', html, re.DOTALL | re.IGNORECASE) or \
                         re.search(r'shopName\s*:\s*"([^"]+)"', html)
            shop_name = shop_match.group(1).strip() if shop_match else ''
            
            self._fill_product_prices([{'product_id': product_id, 'price': 0}])
            
            return {
                'product_id': str(product_id),
                'name': title,
                'url': source_url,
                'shop_name': shop_name,
                'is_wholesale': False,
                'currency': 'CNY'
            }
            
        except Exception as e:
            self.logger.error(f"解析商品详情失败: {e}")
            return None
    
    def get_price(self, product_id: str, **kwargs) -> Optional[Dict[str, Any]]:
        """
        获取商品价格
        :param product_id: 商品ID
        :return: 价格信息
        """
        self.logger.info(f"获取京东商品价格: product_id={product_id}")
        
        sku_str = f'J_{product_id}'
        price_url = f"https://p.3.cn/prices/mgets?skuIds={sku_str}&type=1"
        
        response = self._make_request('GET', price_url, headers={
            'Referer': 'https://www.jd.com'
        })
        
        if response:
            try:
                price_data = response.json()
                if price_data and len(price_data) > 0:
                    item = price_data[0]
                    price = clean_price(item.get('p', '0'))
                    original_price = clean_price(item.get('op', '0')) or None
                    
                    return {
                        'product_id': str(product_id),
                        'price': price,
                        'original_price': original_price,
                        'currency': 'CNY',
                        'platform': self.platform,
                        'source_url': f"https://item.jd.com/{product_id}.html",
                        'price_type': 'retail'
                    }
            except json.JSONDecodeError as e:
                self.logger.error(f"解析价格数据失败: {e}")
        
        return None
    
    def set_cookie(self, cookie: str):
        """
        设置 Cookie
        """
        self.cookie = cookie
        self.headers['Cookie'] = cookie
    
    def set_proxy(self, proxy: str):
        """
        设置代理
        """
        self.proxy = proxy
        self.session.proxies = {
            'http': proxy,
            'https': proxy
        }