"""迁移 016: 创建 insurance_ppt_sessions 表。"""
import logging

logger = logging.getLogger(__name__)


def migrate():
    """迁移入口。"""
    from insurance.db.compat import db
    from sqlalchemy import text

    dialect = db.engine.dialect.name
    is_postgres = dialect == 'postgresql'

    if is_postgres:
        sql = """
            CREATE TABLE IF NOT EXISTS insurance_ppt_sessions (
                id VARCHAR(36) PRIMARY KEY,
                user_id VARCHAR(64) NOT NULL,
                status VARCHAR(20) DEFAULT 'created' NOT NULL,
                files_json TEXT,
                extractions_json TEXT,
                chat_history_json TEXT,
                ppt_path VARCHAR(500),
                markdown_path VARCHAR(500),
                preview_paths_json TEXT,
                preview_pdf_path VARCHAR(500),
                slide_count INTEGER,
                created_at TIMESTAMP DEFAULT NOW(),
                updated_at TIMESTAMP DEFAULT NOW()
            )
        """
    else:
        sql = """
            CREATE TABLE IF NOT EXISTS insurance_ppt_sessions (
                id VARCHAR(36) PRIMARY KEY,
                user_id VARCHAR(64) NOT NULL,
                status VARCHAR(20) DEFAULT 'created' NOT NULL,
                files_json TEXT,
                extractions_json TEXT,
                chat_history_json TEXT,
                ppt_path VARCHAR(500),
                markdown_path VARCHAR(500),
                preview_paths_json TEXT,
                preview_pdf_path VARCHAR(500),
                slide_count INTEGER,
                created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
            )
        """

    logger.info("[migrate_016] 创建 insurance_ppt_sessions 表 ...")
    db.session.execute(text(sql))
    db.session.commit()
    logger.info("[migrate_016] insurance_ppt_sessions 表创建完成")