"""迁移 028：海报背景资产、可编辑文档和合规版本。"""
import logging

from sqlalchemy import inspect, text

logger = logging.getLogger(__name__)


def migrate():
    """幂等增加海报可编辑文档字段。"""
    from insurance.db.compat import db

    existing = {
        item["name"]
        for item in inspect(db.engine).get_columns("poster_records")
    }
    columns = {
        "document_json": "TEXT",
        "document_revision": "INTEGER NOT NULL DEFAULT 1",
        "background_file_url": "VARCHAR(500)",
        "compliance_json": "TEXT",
        "compliance_revision": "VARCHAR(64)",
    }
    for name, definition in columns.items():
        if name not in existing:
            db.session.execute(text(
                f"ALTER TABLE poster_records ADD COLUMN {name} {definition}"
            ))
    db.session.commit()
    logger.info("[migrate_028] 海报可编辑文档字段迁移完成")