"""
从一张表查询，插入另一张表（两表字段一致）。

用法：改下面 SOURCE_TABLE / TARGET_TABLE，在项目根执行：
    python ceshi/copy_table_same_columns.py

逻辑：读 information_schema 取源表列顺序，与目标表取交集后
      INSERT INTO 目标 SELECT 相同列 FROM 源（一条 SQL，由 MySQL 搬运数据）。
"""

from commons.conn_mysql import MySQLPoolOnline

# 修改为你要复制的表名（同一库 drug_retrieve）
SOURCE_TABLE = "retrieve_ybm_shop_info_middle"
TARGET_TABLE = "retrieve_scrape_shop_info"

# True：重复键忽略（需表上有唯一索引）；False：普通 INSERT，冲突则报错
USE_INSERT_IGNORE = True

# 若共同列中含 platform，用该数字覆盖源表；设为 None 则仍从源表读 platform
FIXED_PLATFORM_VALUE = 9


def _columns(conn, table: str) -> list:
    rows = conn.select_data(
        """
        SELECT COLUMN_NAME AS COLUMN_NAME
        FROM information_schema.COLUMNS
        WHERE TABLE_SCHEMA = DATABASE()
          AND TABLE_NAME = %s
        ORDER BY ORDINAL_POSITION
        """,
        (table,),
    )
    if not rows:
        return []
    return [r["COLUMN_NAME"] for r in rows]


def main():
    conn = MySQLPoolOnline()
    src_cols = _columns(conn, SOURCE_TABLE)
    tgt_cols = _columns(conn, TARGET_TABLE)
    if not src_cols:
        print(f"源表不存在或无字段: {SOURCE_TABLE}")
        return
    if not tgt_cols:
        print(f"目标表不存在或无字段: {TARGET_TABLE}")
        return

    tgt_set = set(tgt_cols)
    common = [c for c in src_cols if c in tgt_set and c != "id"]
    if not common:
        print("源表与目标表无共同字段")
        return

    only_src = [c for c in src_cols if c not in tgt_set]
    only_tgt = [c for c in tgt_cols if c not in set(src_cols)]
    if only_src:
        print(f"提示：源表多出的列（目标表无，已跳过）: {only_src}")
    if only_tgt:
        print(f"提示：目标表多出的列（本次不写入，走默认值）: {only_tgt}")

    cols_sql = ", ".join(f"`{c}`" for c in common)
    select_parts = []
    for c in common:
        if c == "platform" and FIXED_PLATFORM_VALUE is not None:
            select_parts.append(str(int(FIXED_PLATFORM_VALUE)))
        else:
            select_parts.append(f"`{c}`")
    select_sql = ", ".join(select_parts)

    kw = "INSERT IGNORE" if USE_INSERT_IGNORE else "INSERT"
    sql = f"{kw} INTO `{TARGET_TABLE}` ({cols_sql}) SELECT {select_sql} FROM `{SOURCE_TABLE}`"

    n = conn.execute(sql)
    print(f"执行完成: {sql.strip()[:120]}...")
    print(f"受影响行数: {n}")


if __name__ == "__main__":
    main()