import pymysql
import jieba
from collections import Counter
from typing import List, Tuple, Set

# ================== 配置区 ==================

DB_CONFIG = {
    'host': '47.113.231.200',
    'port': 28089,
    'user': 'root',
    'password': 'passok123A',
    'database': 'dsp',
    'charset': 'utf8mb4',
}

# 指定需要处理的中文站点（es_srcname）
TARGET_SRCNAMES: List[str] = [
    "http://www.rodong.rep.kp/cn/index.php?MUBAMUAxQA==",
    # 添加你的站点
]

FOREIGN_SRCNAME = 'http://www.rodong.rep.kp/ko/index.php?MUBAMUAxQA=='

# 相似度阈值（关键词重合率），建议 0.3 ~ 0.6
SIMILARITY_THRESHOLD = 0.3


# ================== 文本相似度函数 ==================

def extract_keywords(text: str) -> Set[str]:
    """提取中文关键词：分词 + 过滤单字、数字、标点"""
    if not text:
        return set()
    words = jieba.lcut(text)
    return {w for w in words if len(w) >= 2 and w.isalpha()}


def keyword_overlap_similarity(title1: str, title2: str) -> float:
    """计算两个中文标题的关键词重合率"""
    kw1 = extract_keywords(title1)
    kw2 = extract_keywords(title2)

    if not kw1 and not kw2:
        return 1.0 if title1 == title2 else 0.0
    if not kw1 or not kw2:
        return 0.0

    overlap = kw1 & kw2
    return len(overlap) / max(len(kw1), len(kw2))


# ================== 数据库操作 ==================

def get_chinese_records(cursor) -> List[Tuple]:
    """获取待处理的中文记录"""
    if not TARGET_SRCNAMES:
        return []
    placeholders = ','.join(['%s'] * len(TARGET_SRCNAMES))
    query = f"""
        SELECT es_sid, es_srcname, es_urlname, es_urltitle, es_urltime
        FROM indeximos
        WHERE es_srcname IN ({placeholders})
          AND es_urltitle IS NOT NULL AND TRIM(es_urltitle) != ''
          AND es_urltime IS NOT NULL
          AND es_loadtime > '2026-01-16 10:40:00'
    """
    cursor.execute(query, TARGET_SRCNAMES)
    return cursor.fetchall()


def get_foreign_candidates_by_time(cursor, pub_time) -> List[Tuple]:
    """
    获取同一发布时间的所有外文候选记录（要求 es_abstract 不为空）
    """
    query = """
        SELECT es_sid, es_title, es_urltitle, es_urlcontent
        FROM indeximos
        WHERE es_urltime = %s
          AND es_title IS NOT NULL AND TRIM(es_title) != ''
          AND es_urlcontent IS NOT NULL
          AND es_loadtime > '2026-01-16 10:40:00'
    """
    cursor.execute(query, (pub_time,))
    return cursor.fetchall()


def update_chinese_record(cursor, record_id: int, new_title: str, content: str):
    """更新中文记录的标题和内容"""
    update_query = """
        UPDATE indeximos 
        SET es_title = %s, es_content = %s 
        WHERE es_sid = %s
    """
    cursor.execute(update_query, (new_title, content, record_id))


# ================== 主逻辑 ==================

def main():
    if not TARGET_SRCNAMES:
        print("⚠️ 未指定目标站点，退出。")
        return

    conn = pymysql.connect(**DB_CONFIG)
    cursor = conn.cursor()

    try:
        chinese_records = get_chinese_records(cursor)
        total = len(chinese_records)
        print(f"共加载 {total} 条中文记录用于匹配...")

        matched_count = 0

        for idx, (cid, srcname, urlname, zh_title, pub_time) in enumerate(chinese_records, 1):
            print(f"\n[{idx}/{total}] ID={cid}, 时间={pub_time}, 标题='{zh_title[:30]}...'")

            candidates = get_foreign_candidates_by_time(cursor, pub_time)
            if not candidates:
                print("  → 无同时间且有翻译标题的外文记录")
                continue

            best_score = 0.0
            best_candidate = None

            for fid, trans_title, ori_title, content in candidates:
                # 跳过自己（理论上不会发生，但安全起见）
                if fid == cid:
                    continue

                score = keyword_overlap_similarity(zh_title, trans_title)
                print(f"    候选ID={fid} | 翻译标题='{trans_title[:30]}...' | 重合度={score:.3f}")

                if score > best_score:
                    best_score = score
                    best_candidate = (ori_title, content)

            if best_candidate and best_score >= SIMILARITY_THRESHOLD:
                final_title, final_content = best_candidate
                update_chinese_record(cursor, cid, final_title, final_content)
                matched_count += 1
                print(f"  ✅ 匹配成功! 重合度={best_score:.3f}")
            else:
                print(f"  ❌ 未达阈值（最高相似度={best_score:.3f}）")

        conn.commit()
        print("\n" + "=" * 50)
        print(f"✅ 匹配完成！成功关联 {matched_count} / {total} 条记录。")

    except Exception as e:
        conn.rollback()
        print(f"❌ 发生错误，已回滚: {e}")
        raise
    finally:
        cursor.close()
        conn.close()


if __name__ == "__main__":
    main()