from clickhouse_connect.driver import AsyncClient
from app.log import logger


class ClickHouseInitializer:
    """ClickHouse数据库初始化器"""

    # 6张数据表的 DDL 定义（含 channel 列）
    _TABLE_DDLS = {
        "boss_job": """
        CREATE TABLE IF NOT EXISTS job_data.boss_job (
            id UInt64 DEFAULT 0,
            json_data String DEFAULT '',
            job_id String DEFAULT '',
            channel String DEFAULT 'mini',
            created_at DateTime DEFAULT now(),
            updated_at DateTime DEFAULT now()
        ) ENGINE = MergeTree()
        ORDER BY created_at
        SETTINGS index_granularity = 8192;
        """,
        "boss_company": """
        CREATE TABLE IF NOT EXISTS job_data.boss_company (
            id UInt64 DEFAULT 0,
            json_data String DEFAULT '',
            company_name String DEFAULT '',
            channel String DEFAULT 'mini',
            created_at DateTime DEFAULT now(),
            updated_at DateTime DEFAULT now()
        ) ENGINE = MergeTree()
        ORDER BY created_at
        SETTINGS index_granularity = 8192;
        """,
        "qcwy_job": """
        CREATE TABLE IF NOT EXISTS job_data.qcwy_job (
            id UInt64 DEFAULT 0,
            json_data String DEFAULT '',
            job_id String DEFAULT '',
            update_date_time String DEFAULT '',
            channel String DEFAULT 'mini',
            created_at DateTime DEFAULT now(),
            updated_at DateTime DEFAULT now()
        ) ENGINE = MergeTree()
        ORDER BY created_at
        SETTINGS index_granularity = 8192;
        """,
        "qcwy_company": """
        CREATE TABLE IF NOT EXISTS job_data.qcwy_company (
            id UInt64 DEFAULT 0,
            json_data String DEFAULT '',
            company_name String DEFAULT '',
            channel String DEFAULT 'mini',
            created_at DateTime DEFAULT now(),
            updated_at DateTime DEFAULT now()
        ) ENGINE = MergeTree()
        ORDER BY created_at
        SETTINGS index_granularity = 8192;
        """,
        "zhilian_job": """
        CREATE TABLE IF NOT EXISTS job_data.zhilian_job (
            id UInt64 DEFAULT 0,
            json_data String DEFAULT '',
            number String DEFAULT '',
            first_publish_time String DEFAULT '',
            channel String DEFAULT 'mini',
            created_at DateTime DEFAULT now(),
            updated_at DateTime DEFAULT now()
        ) ENGINE = MergeTree()
        ORDER BY created_at
        SETTINGS index_granularity = 8192;
        """,
        "zhilian_company": """
        CREATE TABLE IF NOT EXISTS job_data.zhilian_company (
            id UInt64 DEFAULT 0,
            json_data String DEFAULT '',
            company_name String DEFAULT '',
            channel String DEFAULT 'mini',
            created_at DateTime DEFAULT now(),
            updated_at DateTime DEFAULT now()
        ) ENGINE = MergeTree()
        ORDER BY created_at
        SETTINGS index_granularity = 8192;
        """,
    }

    _PENDING_COMPANY_DDL = """
    CREATE TABLE IF NOT EXISTS job_data.pending_company (
        source String,
        company_id String,
        company_name String DEFAULT '',
        status String DEFAULT 'pending',
        error_msg String DEFAULT '',
        created_at DateTime DEFAULT now(),
        updated_at DateTime DEFAULT now(),
        version UInt64 DEFAULT 1
    ) ENGINE = ReplacingMergeTree(version)
    ORDER BY (source, company_id)
    SETTINGS index_granularity = 8192;
    """

    _JOB_ANALYTICS_VIEW = """
    CREATE OR REPLACE VIEW job_data.job_analytics AS
    SELECT
        'boss' as source,
        job_id,
        channel,
        JSONExtractString(json_data, 'jobName') as position_name,
        JSONExtractString(json_data, 'brandName') as company_name,
        JSONExtractString(json_data, 'salaryDesc') as salary_text,
        0.0 as salary_min,
        0.0 as salary_max,
        JSONExtractString(json_data, 'cityName') as city,
        JSONExtractString(json_data, 'experienceName') as experience_required,
        JSONExtractString(json_data, 'degreeName') as education,
        created_at
    FROM job_data.boss_job
    UNION ALL
    SELECT
        'qcwy' as source,
        job_id,
        channel,
        JSONExtractString(json_data, 'jobName') as position_name,
        JSONExtractString(json_data, 'companyName') as company_name,
        JSONExtractString(json_data, 'provideSalaryString') as salary_text,
        0.0, 0.0,
        JSONExtractString(json_data, 'workCity') as city,
        JSONExtractString(json_data, 'workYear') as experience_required,
        JSONExtractString(json_data, 'degree') as education,
        created_at
    FROM job_data.qcwy_job
    UNION ALL
    SELECT
        'zhilian' as source,
        number as job_id,
        channel,
        JSONExtractString(json_data, 'jobName') as position_name,
        JSONExtractString(json_data, 'companyName') as company_name,
        JSONExtractString(json_data, 'salary60') as salary_text,
        0.0, 0.0,
        JSONExtractString(json_data, 'workCity') as city,
        JSONExtractString(json_data, 'workingExp') as experience_required,
        JSONExtractString(json_data, 'education') as education,
        created_at
    FROM job_data.zhilian_job
    """

    # 需要添加 channel 列的表
    _CHANNEL_MIGRATION_TABLES = [
        "boss_job", "boss_company",
        "qcwy_job", "qcwy_company",
        "zhilian_job", "zhilian_company",
    ]

    def __init__(self, client: AsyncClient):
        self.client = client

    async def _create_table(self, name: str, ddl: str) -> None:
        try:
            await self.client.command(ddl)
            logger.info(f"表 {name} 创建成功")
        except Exception as e:
            logger.error(f"创建表 {name} 失败: {e}")
            raise

    async def initialize_channel_migration(self) -> None:
        """对已存在的表执行 ALTER TABLE ADD COLUMN IF NOT EXISTS channel"""
        for table in self._CHANNEL_MIGRATION_TABLES:
            try:
                await self.client.command(
                    f"ALTER TABLE job_data.{table} "
                    f"ADD COLUMN IF NOT EXISTS channel String DEFAULT 'mini'"
                )
                logger.info(f"表 {table} channel 列迁移完成")
            except Exception as e:
                logger.warning(f"表 {table} channel 列迁移跳过: {e}")

    async def initialize_all_tables(self) -> None:
        """初始化所有表"""
        logger.info("开始初始化 ClickHouse 数据库表...")

        try:
            # 创建6张数据表
            for name, ddl in self._TABLE_DDLS.items():
                await self._create_table(name, ddl)

            # 创建待处理公司表
            await self._create_table("pending_company", self._PENDING_COMPANY_DDL)

            # 对已存在的表添加 channel 列
            await self.initialize_channel_migration()

            # 创建/重建统一分析视图（含 channel 列）
            try:
                await self.client.command(self._JOB_ANALYTICS_VIEW)
                logger.info("招聘数据分析视图 job_analytics 创建成功")
            except Exception as e:
                logger.error(f"创建招聘数据分析视图失败: {e}")
                raise

            logger.info("ClickHouse 数据库表初始化完成")
        except Exception as e:
            logger.error(f"ClickHouse 数据库初始化失败: {e}")
            raise