CREATE TABLE IF NOT EXISTS `promo_rule` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(100) NOT NULL DEFAULT '' COMMENT '规则名称，如"新客7天优惠"',
  `type` VARCHAR(32) NOT NULL DEFAULT '' COMMENT '规则类型：new_user / inactive_user / campaign',
  `params` JSON NOT NULL COMMENT '类型专属参数',
  `priority` INT NOT NULL DEFAULT 0 COMMENT '优先级，数值越大越优先匹配',
  `enabled` TINYINT(1) NOT NULL DEFAULT 1 COMMENT '是否启用',
  `start_time` DATETIME DEFAULT NULL COMMENT '生效开始时间，NULL=立即生效',
  `end_time` DATETIME DEFAULT NULL COMMENT '生效结束时间，NULL=永不过期',
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `deleted_at` DATETIME DEFAULT NULL COMMENT '软删除时间',
  PRIMARY KEY (`id`),
  KEY `idx_enabled_priority` (`enabled`, `priority` DESC)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='促销规则表';

CREATE TABLE IF NOT EXISTS `subscribe_promo` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `subscribe_id` BIGINT UNSIGNED NOT NULL COMMENT '套餐规格 ID',
  `promo_rule_id` BIGINT UNSIGNED NOT NULL COMMENT '促销规则 ID',
  `promo_price` BIGINT NOT NULL DEFAULT 0 COMMENT '该规格在此规则下的优惠价（分）',
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `uk_subscribe_rule` (`subscribe_id`, `promo_rule_id`),
  KEY `idx_promo_rule_id` (`promo_rule_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='规格促销价表';

CREATE TABLE IF NOT EXISTS `promo_usage` (
  `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  `user_id` BIGINT UNSIGNED NOT NULL COMMENT '用户 ID',
  `promo_rule_id` BIGINT UNSIGNED NOT NULL COMMENT '使用的规则 ID',
  `subscribe_id` BIGINT UNSIGNED NOT NULL COMMENT '购买的规格 ID',
  `order_no` VARCHAR(255) NOT NULL DEFAULT '' COMMENT '关联订单号',
  `promo_price` BIGINT NOT NULL DEFAULT 0 COMMENT '使用时的促销单价（分）',
  `created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  KEY `idx_user_rule` (`user_id`, `promo_rule_id`),
  KEY `idx_order_no` (`order_no`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='促销使用记录表';

SET @promo_rule_id_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'order' AND COLUMN_NAME = 'promo_rule_id');
SET @promo_rule_id_sql = IF(@promo_rule_id_exists = 0, 'ALTER TABLE `order` ADD COLUMN `promo_rule_id` BIGINT UNSIGNED NOT NULL DEFAULT 0 COMMENT ''促销规则ID, 0=未使用促销'' AFTER `discount`', 'SELECT 1');
PREPARE stmt FROM @promo_rule_id_sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET @promo_discount_exists = (SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'order' AND COLUMN_NAME = 'promo_discount');
SET @promo_discount_sql = IF(@promo_discount_exists = 0, 'ALTER TABLE `order` ADD COLUMN `promo_discount` BIGINT NOT NULL DEFAULT 0 COMMENT ''促销优惠金额(分)'' AFTER `promo_rule_id`', 'SELECT 1');
PREPARE stmt FROM @promo_discount_sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;