-- v3.5.4 商品规格：SPU + SKU
-- 1) 新建规格/SKU 表  2) 订单快照列  3) SPU 去掉 sku/barcode 唯一  4) 存量默认 SKU 回填

-- 销售单位枚举（Prisma 用字符串枚举映射；MySQL 用 VARCHAR，此处仅建表）

CREATE TABLE IF NOT EXISTS common_product_spec_attr (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  product_id BIGINT UNSIGNED NOT NULL,
  name VARCHAR(32) NOT NULL,
  sort_order INT NOT NULL DEFAULT 0,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id),
  KEY idx_spec_attr_product (product_id, sort_order),
  CONSTRAINT fk_spec_attr_product FOREIGN KEY (product_id) REFERENCES common_product_item (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS common_product_spec_value (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  attr_id BIGINT UNSIGNED NOT NULL,
  name VARCHAR(64) NOT NULL,
  sort_order INT NOT NULL DEFAULT 0,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id),
  KEY idx_spec_value_attr (attr_id, sort_order),
  CONSTRAINT fk_spec_value_attr FOREIGN KEY (attr_id) REFERENCES common_product_spec_attr (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS common_product_sku (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  product_id BIGINT UNSIGNED NOT NULL,
  sku_code VARCHAR(32) NOT NULL,
  barcode_69 VARCHAR(32) NOT NULL,
  spec_key VARCHAR(128) NOT NULL DEFAULT '',
  spec_text VARCHAR(128) NOT NULL DEFAULT '',
  price DECIMAL(10, 2) NOT NULL,
  benefit_amount DECIMAL(10, 2) NULL,
  status VARCHAR(16) NOT NULL DEFAULT 'DRAFT',
  allow_on_site_pickup TINYINT(1) NOT NULL DEFAULT 0,
  allow_online_purchase TINYINT(1) NOT NULL DEFAULT 1,
  allow_cross_city_delivery TINYINT(1) NOT NULL DEFAULT 1,
  sale_unit VARCHAR(16) NOT NULL DEFAULT 'BOTTLE',
  bottles_per_unit INT NOT NULL DEFAULT 1,
  is_default TINYINT(1) NOT NULL DEFAULT 0,
  sort_order INT NOT NULL DEFAULT 0,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (id),
  UNIQUE KEY uk_product_sku_code (sku_code),
  UNIQUE KEY uk_product_sku_barcode (barcode_69),
  UNIQUE KEY uk_product_sku_spec_key (product_id, spec_key),
  KEY idx_product_sku_status (product_id, status),
  KEY idx_product_sku_default (product_id, is_default),
  CONSTRAINT fk_product_sku_product FOREIGN KEY (product_id) REFERENCES common_product_item (id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS common_product_sku_spec (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  sku_id BIGINT UNSIGNED NOT NULL,
  value_id BIGINT UNSIGNED NOT NULL,
  PRIMARY KEY (id),
  UNIQUE KEY uk_sku_spec (sku_id, value_id),
  KEY idx_sku_spec_value (value_id),
  CONSTRAINT fk_sku_spec_sku FOREIGN KEY (sku_id) REFERENCES common_product_sku (id) ON DELETE CASCADE,
  CONSTRAINT fk_sku_spec_value FOREIGN KEY (value_id) REFERENCES common_product_spec_value (id) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 订单快照列
ALTER TABLE user_order
  ADD COLUMN sku_id BIGINT UNSIGNED NULL AFTER product_id,
  ADD COLUMN sale_unit VARCHAR(16) NOT NULL DEFAULT 'BOTTLE' AFTER quantity,
  ADD COLUMN bottles_per_unit INT NOT NULL DEFAULT 1 AFTER sale_unit;

ALTER TABLE user_order
  ADD KEY idx_order_sku_id (sku_id);

-- SPU：去掉 sku_code / barcode_69 唯一（保留普通索引）；若索引名不同可手工调整
ALTER TABLE common_product_item DROP INDEX sku_code;
ALTER TABLE common_product_item DROP INDEX barcode_69;
ALTER TABLE common_product_item ADD INDEX idx_product_item_sku_code (sku_code);
ALTER TABLE common_product_item ADD INDEX idx_product_item_barcode_69 (barcode_69);

-- 存量商品回填默认 SKU（无规格，瓶装）
INSERT INTO common_product_sku (
  product_id, sku_code, barcode_69, spec_key, spec_text, price, benefit_amount, status,
  allow_on_site_pickup, allow_online_purchase, allow_cross_city_delivery,
  sale_unit, bottles_per_unit, is_default, sort_order, created_at, updated_at
)
SELECT
  p.id, p.sku_code, p.barcode_69, '', COALESCE(p.spec, ''), p.price, p.benefit_amount, p.status,
  p.allow_on_site_pickup, p.allow_online_purchase, p.allow_cross_city_delivery,
  'BOTTLE', 1, 1, 0, NOW(3), NOW(3)
FROM common_product_item p
WHERE NOT EXISTS (
  SELECT 1 FROM common_product_sku s WHERE s.product_id = p.id
);