from typing import Iterable

from sqlalchemy import bindparam, create_engine, and_, or_, desc, text
from sqlalchemy.orm import sessionmaker, Session


class DatabaseManager:
    """数据库管理类"""

    # mysql+pymysql://<用户名>:<密码>@<主机地址>:<端口>/<数据库名>?charset=utf8mb4
    def __init__(self):
        connection_string = (
            f"mysql+pymysql://content_rw:bC1aH4bA1lB0@rm-t4nh1xx6o2a6vj8qu3o.mysql.singapore.rds.aliyuncs.com:3306/open_aigc_pattern?charset=utf8mb4"
        )
        self.engine = create_engine(connection_string, pool_pre_ping=True, pool_recycle=3600)
        self.SessionLocal = sessionmaker(bind=self.engine, autoflush=False, autocommit=False)

    def get_session(self) -> Session:
        """获取数据库会话"""
        return self.SessionLocal()


class DatabaseManager2:
    """数据库管理类"""

    # mysql+pymysql://<用户名>:<密码>@<主机地址>:<端口>/<数据库名>?charset=utf8mb4
    def __init__(self):
        connection_string = (
            f"mysql+pymysql://content_rw:bC1aH4bA1lB0@rm-t4nh1xx6o2a6vj8qu3o.mysql.singapore.rds.aliyuncs.com:3306/open_aigc_pattern?charset=utf8mb4"
        )
        self.engine = create_engine(connection_string, pool_pre_ping=True, pool_recycle=3600)
        self.SessionLocal = sessionmaker(bind=self.engine, autoflush=False, autocommit=False)

    def get_session(self) -> Session:
        """获取数据库会话"""
        return self.SessionLocal()


def query_video_ids_by_names(execution_id: int, names: Iterable[str]) -> list[str]:
    """按 execution_id + 名称列表查询去重后的 post_id。"""
    clean_names = [str(n).strip() for n in names if n is not None and str(n).strip()]
    if not clean_names:
        return []

    manager = DatabaseManager()
    session = manager.get_session()
    video_ids: set[str] = set()
    try:
        for name in clean_names:
            categories = session.execute(
                text(
                    """
                    SELECT id
                    FROM topic_pattern_category
                    WHERE execution_id = :execution_id AND name = :name
                    """
                ),
                {"execution_id": execution_id, "name": name},
            ).fetchall()
            category_ids = [row[0] for row in categories if row and row[0] is not None]

            if category_ids:
                elements = session.execute(
                    text(
                        """
                        SELECT post_id
                        FROM topic_pattern_element
                        WHERE execution_id = :execution_id
                          AND category_id IN :category_ids
                        """
                    ).bindparams(bindparam("category_ids", expanding=True)),
                    {"execution_id": execution_id, "category_ids": category_ids},
                ).fetchall()
            else:
                elements = session.execute(
                    text(
                        """
                        SELECT post_id
                        FROM topic_pattern_element
                        WHERE execution_id = :execution_id AND name = :name
                        """
                    ),
                    {"execution_id": execution_id, "name": name},
                ).fetchall()

            for row in elements:
                post_id = row[0] if row else None
                if post_id is not None and str(post_id).strip():
                    video_ids.add(str(post_id).strip())
    finally:
        session.close()

    return list(video_ids)

def query_category_level(execution_id: int, name: str) -> int | None:
    """按 execution_id + 分类名称查询 topic_pattern_category.level。"""
    clean_name = str(name).strip() if name is not None else ""
    if not clean_name:
        return None

    manager = DatabaseManager()
    session = manager.get_session()
    try:
        row = session.execute(
            text(
                """
                SELECT level
                FROM topic_pattern_category
                WHERE execution_id = :execution_id AND name = :name
                ORDER BY id DESC
                LIMIT 1
                """
            ),
            {"execution_id": execution_id, "name": clean_name},
        ).first()
        if not row:
            return None
        level = row[0]
        return int(level) if level is not None else None
    finally:
        session.close()

db2 = DatabaseManager2()


def exist_cluster_tree(merge_level2):
    session = db2.get_session()

    exec_row = session.execute(
        text("""
            SELECT id
            FROM cluster_execution
            WHERE name LIKE :name AND status = 2
            ORDER BY create_time DESC
            LIMIT 1
        """),
        {"name": f"{merge_level2}%"},
    ).mappings().first()

    if not exec_row:
        return False
    return True