"""
子图数据库表初始化
在 FastAPI 启动时创建表
"""
from typing import Optional


async def init_subgraph_tables(conn):
    """
    初始化子图所需的表
    
    Args:
        conn: 数据库连接（来自 AsyncPostgresSaver）
    """
    
    # 1. contacts 表（通讯录）
    await _create_contacts_table(conn)
    
    # 2. words 表（词典）
    await _create_words_table(conn)
    
    # 3. news 表（资讯）
    await _create_news_table(conn)


async def _create_contacts_table(conn):
    """创建 contacts 表"""
    sql = """
        CREATE TABLE IF NOT EXISTS contacts (
            id VARCHAR(64) PRIMARY KEY,
            user_id VARCHAR(64) NOT NULL,
            name VARCHAR(100) NOT NULL,
            phone VARCHAR(32),
            email VARCHAR(100),
            company VARCHAR(100),
            position VARCHAR(100),
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        );
    """
    
    try:
        async with conn.cursor() as cur:
            await cur.execute(sql)
            await _create_index_if_not_exists(conn, "idx_contacts_user", "contacts", "user_id")
    except Exception as e:
        print(f"contacts 表可能已存在: {e}")


async def _create_words_table(conn):
    """创建 words 表"""
    sql = """
        CREATE TABLE IF NOT EXISTS words (
            id VARCHAR(64) PRIMARY KEY,
            user_id VARCHAR(64) NOT NULL,
            word VARCHAR(100) NOT NULL,
            phonetic VARCHAR(100),
            part_of_speech VARCHAR(50),
            definition TEXT,
            examples TEXT,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        );
    """
    
    try:
        async with conn.cursor() as cur:
            await cur.execute(sql)
            await _create_index_if_not_exists(conn, "idx_words_user", "words", "user_id")
            await _create_index_if_not_exists(conn, "idx_words_word", "words", "word")
    except Exception as e:
        print(f"words 表可能已存在: {e}")


async def _create_news_table(conn):
    """创建 news 表"""
    sql = """
        CREATE TABLE IF NOT EXISTS news (
            id VARCHAR(64) PRIMARY KEY,
            user_id VARCHAR(64) NOT NULL,
            title VARCHAR(200) NOT NULL,
            content TEXT,
            url VARCHAR(500),
            source VARCHAR(100),
            keywords TEXT,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
        );
    """
    
    try:
        async with conn.cursor() as cur:
            await cur.execute(sql)
            await _create_index_if_not_exists(conn, "idx_news_user", "news", "user_id")
    except Exception as e:
        print(f"news 表可能已存在: {e}")


async def _create_index_if_not_exists(conn, index_name: str, table_name: str, column_name: str):
    """创建索引（如果不存在）"""
    sql = f"CREATE INDEX IF NOT EXISTS {index_name} ON {table_name} ({column_name});"
    try:
        async with conn.cursor() as cur:
            await cur.execute(sql)
    except Exception as e:
        print(f"索引 {index_name} 可能已存在: {e}")