"""迁移 027：PPT/海报品牌策略与后台对象软删除字段。"""
import logging

from sqlalchemy import inspect, text

logger = logging.getLogger(__name__)


def _column_names(db, table_name: str) -> set[str]:
    return {item["name"] for item in inspect(db.engine).get_columns(table_name)}


def _index_names(db, table_name: str) -> set[str]:
    return {item["name"] for item in inspect(db.engine).get_indexes(table_name)}


def _add_columns(db, table_name: str, columns: dict[str, str]):
    existing = _column_names(db, table_name)
    for name, definition in columns.items():
        if name not in existing:
            db.session.execute(text(
                f"ALTER TABLE {table_name} ADD COLUMN {name} {definition}"
            ))


def _add_index(db, table_name: str, index_name: str, columns: str):
    if index_name not in _index_names(db, table_name):
        db.session.execute(text(
            f"CREATE INDEX {index_name} ON {table_name} ({columns})"
        ))


def migrate():
    """幂等增加品牌策略和软删除字段。"""
    from insurance.db.compat import db

    db.session.execute(text("""
        CREATE TABLE IF NOT EXISTS insurance_ppt_scenarios (
            code VARCHAR(50) PRIMARY KEY,
            name VARCHAR(100) NOT NULL,
            base_scenario VARCHAR(50),
            generation_mode VARCHAR(20) NOT NULL DEFAULT 'single',
            description TEXT,
            status SMALLINT NOT NULL DEFAULT 1,
            sort_order INTEGER NOT NULL DEFAULT 0,
            is_builtin BOOLEAN NOT NULL DEFAULT FALSE,
            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
            deleted_at TIMESTAMP
        )
    """))
    # 先提交新表，确保后续 inspector 使用的独立连接能够看到它。
    db.session.commit()

    _add_columns(db, "insurance_ppt_companies", {
        "masking_enabled": "BOOLEAN NOT NULL DEFAULT FALSE",
        "logo_enabled": "BOOLEAN NOT NULL DEFAULT TRUE",
        "deleted_at": "TIMESTAMP",
    })
    _add_columns(db, "insurance_ppt_products", {
        "masking_enabled": "BOOLEAN NOT NULL DEFAULT FALSE",
        "deleted_at": "TIMESTAMP",
    })
    _add_columns(db, "insurance_ppt_templates", {
        "deleted_at": "TIMESTAMP",
    })
    _add_columns(db, "poster_copy_templates", {
        "deleted_at": "TIMESTAMP",
    })

    # 新增字段提交后再检查并创建索引，避免 DDL 对其他连接不可见。
    db.session.commit()

    _add_index(
        db, "insurance_ppt_companies",
        "idx_ppt_companies_status_deleted", "status, deleted_at",
    )
    _add_index(
        db, "insurance_ppt_scenarios",
        "idx_ppt_scenarios_status_deleted", "status, deleted_at",
    )

    builtins = [
        ("single_savings", "单份储蓄计划", "single_savings", "single", 10),
        ("multi_savings_comparison", "双/多储蓄险对比", "multi_savings_comparison", "compare", 20),
        ("savings_iul_comprehensive", "储蓄险 + IUL 综合方案", "savings_iul_comprehensive", "portfolio", 30),
        ("generic_single", "通用单产品", "generic_single", "single", 40),
        ("generic_compare", "通用同险种对比", "generic_compare", "compare", 50),
        ("generic_portfolio", "通用组合方案", "generic_portfolio", "portfolio", 60),
    ]
    for code, name, base_scenario, generation_mode, sort_order in builtins:
        db.session.execute(text("""
            INSERT INTO insurance_ppt_scenarios
                (code, name, base_scenario, generation_mode, status, sort_order, is_builtin)
            SELECT :code, :name, :base_scenario, :generation_mode, 1, :sort_order, TRUE
            WHERE NOT EXISTS (
                SELECT 1 FROM insurance_ppt_scenarios WHERE code = :code
            )
        """), {
            "code": code,
            "name": name,
            "base_scenario": base_scenario,
            "generation_mode": generation_mode,
            "sort_order": sort_order,
        })
    _add_index(
        db, "insurance_ppt_products",
        "idx_ppt_products_status_deleted", "status, deleted_at",
    )
    _add_index(
        db, "insurance_ppt_products",
        "idx_ppt_products_company_deleted", "company_id, deleted_at",
    )
    _add_index(
        db, "insurance_ppt_templates",
        "idx_ppt_templates_status_deleted", "status, deleted_at",
    )
    _add_index(
        db, "poster_copy_templates",
        "idx_copy_templates_status_deleted", "status, deleted_at",
    )

    db.session.commit()
    logger.info("[migrate_027] 品牌策略与软删除字段迁移完成")