SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci;

-- 本迁移同时覆盖两种开发阶段状态：
-- 1. 老库已有 admin_app_configs，但由早期 AutoMigrate 建表，缺少描述和创建时间列；
-- 2. 新本地库先跑 SQL migrations 再 AutoMigrate，此时表还不存在，后续 ALTER 会直接失败。
CREATE TABLE IF NOT EXISTS admin_app_configs (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `group` VARCHAR(64) NOT NULL,
  `key` VARCHAR(100) NOT NULL,
  value TEXT,
  description VARCHAR(255) NOT NULL DEFAULT '' COMMENT '描述信息',
  created_at_ms BIGINT NOT NULL DEFAULT 0 COMMENT '创建时间，UTC epoch ms',
  updated_at_ms BIGINT NOT NULL DEFAULT 0 COMMENT '更新时间，UTC epoch ms',
  PRIMARY KEY (id),
  UNIQUE KEY idx_admin_app_config_group_key (`group`, `key`),
  KEY idx_admin_app_configs_group (`group`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 老生产库曾由早期 AutoMigrate 建表，缺少当前模型依赖的描述和创建时间列。
SET @ddl := IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'admin_app_configs' AND COLUMN_NAME = 'description') = 0,
  'ALTER TABLE admin_app_configs ADD COLUMN description VARCHAR(255) NOT NULL DEFAULT '''' COMMENT ''描述信息'' AFTER value',
  'SELECT 1'
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @ddl := IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'admin_app_configs' AND COLUMN_NAME = 'created_at_ms') = 0,
  'ALTER TABLE admin_app_configs ADD COLUMN created_at_ms BIGINT NOT NULL DEFAULT 0 COMMENT ''创建时间，UTC epoch ms'' AFTER description',
  'SELECT 1'
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @ddl := IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'admin_app_banners' AND COLUMN_NAME = 'created_at_ms') = 0,
  'ALTER TABLE admin_app_banners ADD COLUMN created_at_ms BIGINT NOT NULL DEFAULT 0 COMMENT ''创建时间，UTC epoch ms'' AFTER ends_at_ms',
  'SELECT 1'
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @ddl := IF(
  (SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'admin_app_versions' AND COLUMN_NAME = 'created_at_ms') = 0,
  'ALTER TABLE admin_app_versions ADD COLUMN created_at_ms BIGINT NOT NULL DEFAULT 0 COMMENT ''创建时间，UTC epoch ms'' AFTER description',
  'SELECT 1'
);
PREPARE stmt FROM @ddl;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;