#!/usr/bin/env python3
"""
Crawl 盘锦辽滨沿海经济技术开发区 - 通知公告
https://ldwxq.panjin.gov.cn/13775/
Pagination: list-2.html ... list-37.html
List: <ul class="Q25_ListContlist"><li><a href="..." title="完整标题"><span>标题</span><span>日期</span></a></li>
Detail: <div class="Q25_artcont">content HTML</div>
Detail title: <p class="Q25_articleconttitle">标题</p>
Detail date: <span>发布日期：2026-07-03</span>
"""

import requests, json, re, os, sys, time
from bs4 import BeautifulSoup
from urllib.parse import urljoin

BASE_URL = 'https://ldwxq.panjin.gov.cn/13775/'
BASE_DOMAIN = 'https://ldwxq.panjin.gov.cn'
OUTPUT_FILE = '/root/gov_crawler/output/panjin_notice.jsonl'

HEADERS = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
    'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8',
}

os.makedirs(os.path.dirname(OUTPUT_FILE), exist_ok=True)

session = requests.Session()
session.headers.update(HEADERS)

# ─── 正文取文本（2026-09-11）：行内节点直接拼接，只在块级边界 / <br> 处换行 ───
# ⚠️ 不要用 el.get_text("\n") 取正文 —— 它是「每个**文本节点**之间插 \n」，Word 粘贴的
#    公文把一行拆成 <span>提取码：</span>pwaj<span>。查阅…</span>，这些行内节点于是各自
#    成行（福泉 id=2095080103703914437 实例：`提取码：`/`pwaj`/`。查阅…` 各占一行）。
_BLOCK_TAGS = {'address', 'article', 'aside', 'blockquote', 'details', 'dialog', 'dd', 'div',
               'dl', 'dt', 'fieldset', 'figcaption', 'figure', 'footer', 'form', 'h1', 'h2',
               'h3', 'h4', 'h5', 'h6', 'header', 'hgroup', 'hr', 'li', 'main', 'nav', 'ol',
               'p', 'pre', 'section', 'table', 'tbody', 'thead', 'tfoot', 'tr', 'td', 'th',
               'ul', 'center', 'caption'}


def body_text(el):
    """块级边界出换行、行内节点直接拼接、<br> 出换行（≈ 浏览器看到的换行结构）。"""
    if el is None:
        return ''
    import re as _re
    from bs4 import NavigableString
    out = []

    def walk(node):
        for ch in node.children:
            if isinstance(ch, NavigableString):
                out.append(str(ch))
            elif getattr(ch, 'name', None) == 'br':
                out.append('\n')
            elif getattr(ch, 'name', None) in _BLOCK_TAGS:
                out.append('\n')
                walk(ch)
                out.append('\n')
            else:
                walk(ch)
    walk(el)
    t = ''.join(out)
    t = _re.sub(r'[ \t\r\f\v]*\n[ \t\r\f\v]*', '\n', t)
    t = _re.sub(r'\n{3,}', '\n\n', t)
    return t.strip()


def get_page_url(page_num):
    if page_num == 1:
        return BASE_URL
    return f'https://ldwxq.panjin.gov.cn/13775/list-{page_num}.html'

def parse_list(html):
    soup = BeautifulSoup(html, 'html.parser')
    items = []
    ul = soup.find('ul', class_='Q25_ListContlist')
    if not ul:
        print(f'  [WARN] Could not find Q25_ListContlist')
        return items
    for li in ul.find_all('li', recursive=False):
        a = li.find('a')
        if not a:
            continue
        href = a.get('href', '')
        title = a.get('title', '')
        if not title:
            title = a.get_text(strip=True)
        spans = a.find_all('span')
        date = ''
        if len(spans) >= 2:
            date = spans[-1].get_text(strip=True)
        if href and not href.startswith('http'):
            href = urljoin(BASE_URL, href)
        items.append({'url': href, 'title': title, 'date': date})
    return items

def parse_detail(url, html):
    soup = BeautifulSoup(html, 'html.parser')
    
    # Title
    title_el = soup.find('p', class_='Q25_articleconttitle')
    list_title = title_el.get_text(strip=True) if title_el else ''
    
    # Date
    date_el = soup.find('span', string=re.compile(r'发布日期'))
    pub_date = ''
    if date_el:
        txt = date_el.get_text(strip=True)
        m = re.search(r'(\d{4}-\d{1,2}-\d{1,2})', txt)
        if m:
            pub_date = m.group(1)
    
    # Content
    content_div = soup.find('div', class_='Q25_artcont')
    content_html = ''
    if content_div:
        # Clean - remove style attributes but keep structure
        for tag in content_div.find_all(True):
            # Keep only structural attributes
            attrs_to_keep = ['href', 'src', 'alt', 'target']
            for attr in list(tag.attrs):
                if attr not in attrs_to_keep:
                    del tag[attr]
        content_html = str(content_div)
    
    # Text summary
    text = body_text(content_div) if content_div else ''
    
    # Attachments
    attachments = []
    if content_div:
        for a in content_div.find_all('a', href=True):
            ahref = a.get('href', '')
            if ahref.endswith(('.pdf', '.doc', '.docx', '.xls', '.xlsx', '.zip', '.rar')):
                attachments.append({
                    'url': urljoin(url, ahref) if not ahref.startswith('http') else ahref,
                    'text': a.get_text(strip=True) or os.path.basename(ahref)
                })
    
    return {
        'list_title': list_title,
        'pub_date': pub_date,
        'content_html': content_html,
        'summary': text,
        'attachments': attachments
    }

def get_total_pages():
    print('  Checking total pages...')
    resp = session.get(BASE_URL, timeout=30)
    resp.encoding = 'utf-8'
    
    max_page = 1
    # Look for page number links
    soup = BeautifulSoup(resp.text, 'html.parser')
    for a in soup.find_all('a', href=True):
        href = a.get('href', '')
        m = re.search(r'list-(\d+)', href)
        if m:
            pn = int(m.group(1))
            if pn > max_page:
                max_page = pn
    print(f'  Total pages: {max_page}')
    return max_page

def crawl_all():
    total_pages = get_total_pages()
    
    all_items = []
    for page in range(1, total_pages + 1):
        url = get_page_url(page)
        print(f'  Page {page}/{total_pages} ({url})')
        try:
            resp = session.get(url, timeout=30)
            resp.encoding = 'utf-8'
            items = parse_list(resp.text)
            print(f'    Found {len(items)} items')
            all_items.extend(items)
        except Exception as e:
            print(f'    [ERROR] {e}')
        time.sleep(0.5)
    
    print(f'\nTotal list items: {len(all_items)}')
    
    # Deduplicate by URL
    seen_urls = set()
    unique_items = []
    for item in all_items:
        if item['url'] not in seen_urls:
            seen_urls.add(item['url'])
            unique_items.append(item)
    print(f'Unique items: {len(unique_items)}')
    
    # Crawl details
    record_count = 0
    with open(OUTPUT_FILE, 'w', encoding='utf-8') as f:
        for i, item in enumerate(unique_items):
            url = item['url']
            print(f'  [{i+1}/{len(unique_items)}] {item["title"][:40]}...')
            try:
                resp = session.get(url, timeout=30)
                resp.encoding = 'utf-8'
                detail = parse_detail(url, resp.text)
                
                title = detail.get('list_title') or item['title']
                
                record = {
                    'title': title,
                    'url': url,
                    'date': detail['pub_date'] or item['date'],
                    'content': detail['content_html'],
                    'summary': detail['summary'][:500] if detail['summary'] else '',
                    'site_name': '盘锦辽滨沿海经济技术开发区',
                    'group': '盘锦辽滨',
                    'attachments': json.dumps(detail['attachments'], ensure_ascii=False) if detail['attachments'] else '',
                }
                f.write(json.dumps(record, ensure_ascii=False) + '\n')
                record_count += 1
            except Exception as e:
                print(f'    [ERROR] {url}: {e}')
            time.sleep(0.3)
    
    print(f'\nDone! {record_count} records written to {OUTPUT_FILE}')

if __name__ == '__main__':
    is_incremental = '--incremental' in sys.argv
    if is_incremental:
        # Only crawl page 1
        print('Incremental mode: crawling page 1 only')
        url = BASE_URL
        resp = session.get(url, timeout=30)
        resp.encoding = 'utf-8'
        items = parse_list(resp.text)
        print(f'  Found {len(items)} items on page 1')
        
        with open(OUTPUT_FILE, 'w', encoding='utf-8') as f:
            for item in items:
                try:
                    resp = session.get(item['url'], timeout=30)
                    resp.encoding = 'utf-8'
                    detail = parse_detail(item['url'], resp.text)
                    title = detail.get('list_title') or item['title']
                    record = {
                        'title': title,
                        'url': item['url'],
                        'date': detail['pub_date'] or item['date'],
                        'content': detail['content_html'],
                        'summary': detail['summary'][:500] if detail['summary'] else '',
                        'site_name': '盘锦辽滨沿海经济技术开发区',
                        'group': '盘锦辽滨',
                        'attachments': json.dumps(detail['attachments'], ensure_ascii=False) if detail['attachments'] else '',
                    }
                    f.write(json.dumps(record, ensure_ascii=False) + '\n')
                except Exception as e:
                    print(f'    [ERROR] {item["url"]}: {e}')
                time.sleep(0.3)
        print(f'Incremental done: {len(items)} records')
    else:
        crawl_all()