"""
数据库读取模块（只读）
- PostgreSQL: 读取 cards_master_v2 卡牌元数据
- ClickHouse: 读取 card_transactions_unified_sync 交易数据
"""
import sys
sys.stdout.reconfigure(encoding="utf-8")


def read_card_master(pg_config, table, filters=None, limit=None):
    """
    读取 cards_master_v2。
    Args:
        filters: dict, 例 {"language":["简中"], "year":["1996","1999"]}
        limit: 限制返回条数（调试用）
    Returns:
        list of dict: [{card_id, card_name_ch, language, year, card_no, pg_label, img_url}, ...]
    """
    import psycopg2

    where = ["img_url IS NOT NULL", "img_url != ''"]
    params = []
    if filters:
        for key, vals in filters.items():
            if vals:
                placeholders = ",".join(["%s"] * len(vals))
                where.append(f"{key} IN ({placeholders})")
                params.extend(vals)

    sql = f"SELECT card_id, card_name_ch, language, year, card_no, pg_label, img_url " \
          f"FROM {table} WHERE {' AND '.join(where)} ORDER BY card_id"
    if limit:
        sql += f" LIMIT {int(limit)}"

    conn = psycopg2.connect(**pg_config)
    try:
        cur = conn.cursor()
        cur.execute(sql, params)
        cols = [d[0] for d in cur.description]
        rows = [dict(zip(cols, r)) for r in cur.fetchall()]
        cur.close()
        return rows
    finally:
        conn.close()


def read_transactions(ch_config, table, limit=None, where=None):
    """
    读取交易数据。
    Args:
        limit: 限制条数
        where: 额外 WHERE 条件字符串
    Returns:
        list of dict: [{tx_id, card_id, platform, title, image_uri, cos_image_url, ...}, ...]
    """
    import clickhouse_connect

    sql = f"SELECT * FROM {table}"
    if where:
        sql += f" WHERE {where}"
    sql += " ORDER BY sold_date DESC"
    if limit:
        sql += f" LIMIT {int(limit)}"

    client = clickhouse_connect.get_client(**ch_config)
    try:
        result = client.query(sql)
        cols = result.column_names
        return [dict(zip(cols, r)) for r in result.result_rows]
    finally:
        client.close()


def count_card_master(pg_config, table, filters=None):
    """统计满足条件的卡牌数量"""
    import psycopg2
    where = ["img_url IS NOT NULL", "img_url != ''"]
    params = []
    if filters:
        for key, vals in filters.items():
            if vals:
                placeholders = ",".join(["%s"] * len(vals))
                where.append(f"{key} IN ({placeholders})")
                params.extend(vals)
    sql = f"SELECT COUNT(*) FROM {table} WHERE {' AND '.join(where)}"
    conn = psycopg2.connect(**pg_config)
    try:
        cur = conn.cursor()
        cur.execute(sql, params)
        cnt = cur.fetchone()[0]
        cur.close()
        return cnt
    finally:
        conn.close()