-- =====================================================================================
-- 商城系统字段增量添加脚本 (仅字段和索引)
-- 适用于已有表结构，仅添加缺失字段和索引的场景
-- =====================================================================================

-- =====================================================================================
-- 1. 为现有 ak_users 表添加商城字段
-- =====================================================================================

DO $$
BEGIN
    -- 商城状态字段
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'mall_status') THEN
        ALTER TABLE public.ak_users ADD COLUMN mall_status INTEGER DEFAULT 1;
        ALTER TABLE public.ak_users ADD CONSTRAINT chk_ak_users_mall_status CHECK (mall_status IN (1,2));
        RAISE NOTICE '✓ 添加字段: ak_users.mall_status';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.mall_status';
    END IF;
    
    -- 商城用户类型字段
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'mall_type') THEN
        ALTER TABLE public.ak_users ADD COLUMN mall_type INTEGER DEFAULT 1;
        ALTER TABLE public.ak_users ADD CONSTRAINT chk_ak_users_mall_type CHECK (mall_type IN (1,2,3));
        RAISE NOTICE '✓ 添加字段: ak_users.mall_type';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.mall_type';
    END IF;
    
    -- 最后登录IP字段
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'last_login_ip') THEN
        ALTER TABLE public.ak_users ADD COLUMN last_login_ip INET;
        RAISE NOTICE '✓ 添加字段: ak_users.last_login_ip';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.last_login_ip';
    END IF;
    
    -- 总订单数字段
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'total_orders') THEN
        ALTER TABLE public.ak_users ADD COLUMN total_orders INTEGER DEFAULT 0 CHECK (total_orders >= 0);
        RAISE NOTICE '✓ 添加字段: ak_users.total_orders';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.total_orders';
    END IF;
    
    -- 总消费金额字段
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'total_spent') THEN
        ALTER TABLE public.ak_users ADD COLUMN total_spent DECIMAL(12,2) DEFAULT 0.00 CHECK (total_spent >= 0);
        RAISE NOTICE '✓ 添加字段: ak_users.total_spent';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.total_spent';
    END IF;
    
    -- 用户等级字段
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'user_level') THEN
        ALTER TABLE public.ak_users ADD COLUMN user_level INTEGER DEFAULT 1 CHECK (user_level >= 1 AND user_level <= 10);
        RAISE NOTICE '✓ 添加字段: ak_users.user_level';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.user_level';
    END IF;
    
    -- 积分字段
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'points') THEN
        ALTER TABLE public.ak_users ADD COLUMN points INTEGER DEFAULT 0 CHECK (points >= 0);
        RAISE NOTICE '✓ 添加字段: ak_users.points';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.points';
    END IF;
    
    -- 实名认证状态
    IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'verified_status') THEN
        ALTER TABLE public.ak_users ADD COLUMN verified_status INTEGER DEFAULT 0 CHECK (verified_status IN (0,1,2));
        RAISE NOTICE '✓ 添加字段: ak_users.verified_status';
    ELSE
        RAISE NOTICE '○ 字段已存在: ak_users.verified_status';
    END IF;
    
    RAISE NOTICE '>> ak_users 表字段检查完成';
END $$;

-- =====================================================================================
-- 2. 为现有商城表添加CID字段（SEO优化必需）
-- =====================================================================================

-- 为主要商城表添加cid自增字段
DO $$
BEGIN
    -- 为 ml_categories 表添加 cid 字段
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_categories') THEN
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_categories' AND column_name = 'cid') THEN
            -- 创建序列
            CREATE SEQUENCE IF NOT EXISTS public.ml_categories_cid_seq;
            -- 添加cid字段
            ALTER TABLE public.ml_categories ADD COLUMN cid INTEGER UNIQUE DEFAULT nextval('public.ml_categories_cid_seq');
            -- 设置序列所有者
            ALTER SEQUENCE public.ml_categories_cid_seq OWNED BY public.ml_categories.cid;
            -- 更新现有记录的cid值
            UPDATE public.ml_categories SET cid = nextval('public.ml_categories_cid_seq') WHERE cid IS NULL;
            RAISE NOTICE '✓ 添加字段: ml_categories.cid (自增SEO ID)';
        ELSE
            RAISE NOTICE '○ 字段已存在: ml_categories.cid';
        END IF;
    END IF;
    
    -- 为 ml_brands 表添加 cid 字段
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_brands') THEN
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_brands' AND column_name = 'cid') THEN
            CREATE SEQUENCE IF NOT EXISTS public.ml_brands_cid_seq;
            ALTER TABLE public.ml_brands ADD COLUMN cid INTEGER UNIQUE DEFAULT nextval('public.ml_brands_cid_seq');
            ALTER SEQUENCE public.ml_brands_cid_seq OWNED BY public.ml_brands.cid;
            UPDATE public.ml_brands SET cid = nextval('public.ml_brands_cid_seq') WHERE cid IS NULL;
            RAISE NOTICE '✓ 添加字段: ml_brands.cid (自增SEO ID)';
        ELSE
            RAISE NOTICE '○ 字段已存在: ml_brands.cid';
        END IF;
    END IF;
    
    -- 为 ml_products 表添加 cid 字段
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_products') THEN
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'cid') THEN
            CREATE SEQUENCE IF NOT EXISTS public.ml_products_cid_seq;
            ALTER TABLE public.ml_products ADD COLUMN cid INTEGER UNIQUE DEFAULT nextval('public.ml_products_cid_seq');
            ALTER SEQUENCE public.ml_products_cid_seq OWNED BY public.ml_products.cid;
            UPDATE public.ml_products SET cid = nextval('public.ml_products_cid_seq') WHERE cid IS NULL;
            RAISE NOTICE '✓ 添加字段: ml_products.cid (自增SEO ID)';
        ELSE
            RAISE NOTICE '○ 字段已存在: ml_products.cid';
        END IF;
    END IF;
    
    -- 为 ml_shops 表添加 cid 字段
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_shops') THEN
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_shops' AND column_name = 'cid') THEN
            CREATE SEQUENCE IF NOT EXISTS public.ml_shops_cid_seq;
            ALTER TABLE public.ml_shops ADD COLUMN cid INTEGER UNIQUE DEFAULT nextval('public.ml_shops_cid_seq');
            ALTER SEQUENCE public.ml_shops_cid_seq OWNED BY public.ml_shops.cid;
            UPDATE public.ml_shops SET cid = nextval('public.ml_shops_cid_seq') WHERE cid IS NULL;
            RAISE NOTICE '✓ 添加字段: ml_shops.cid (自增SEO ID)';
        ELSE
            RAISE NOTICE '○ 字段已存在: ml_shops.cid';
        END IF;
    END IF;
    
    -- 为 ml_orders 表添加 cid 字段
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_orders') THEN
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_orders' AND column_name = 'cid') THEN
            CREATE SEQUENCE IF NOT EXISTS public.ml_orders_cid_seq;
            ALTER TABLE public.ml_orders ADD COLUMN cid INTEGER UNIQUE DEFAULT nextval('public.ml_orders_cid_seq');
            ALTER SEQUENCE public.ml_orders_cid_seq OWNED BY public.ml_orders.cid;
            UPDATE public.ml_orders SET cid = nextval('public.ml_orders_cid_seq') WHERE cid IS NULL;
            RAISE NOTICE '✓ 添加字段: ml_orders.cid (自增SEO ID)';
        ELSE
            RAISE NOTICE '○ 字段已存在: ml_orders.cid';
        END IF;
    END IF;
    
    RAISE NOTICE '>> CID 字段添加完成';
END $$;

-- =====================================================================================
-- 3. 为现有商城表添加其他字段（如果表存在的话）
-- =====================================================================================

-- 为 ml_products 表添加SEO和营销字段
DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_products') THEN
        -- SEO标题
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'seo_title') THEN
            ALTER TABLE public.ml_products ADD COLUMN seo_title VARCHAR(200);
            RAISE NOTICE '✓ 添加字段: ml_products.seo_title';
        END IF;
        
        -- SEO描述
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'seo_description') THEN
            ALTER TABLE public.ml_products ADD COLUMN seo_description VARCHAR(500);
            RAISE NOTICE '✓ 添加字段: ml_products.seo_description';
        END IF;
        
        -- SEO关键词
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'seo_keywords') THEN
            ALTER TABLE public.ml_products ADD COLUMN seo_keywords TEXT[];
            RAISE NOTICE '✓ 添加字段: ml_products.seo_keywords';
        END IF;
        
        -- URL slug
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'slug') THEN
            ALTER TABLE public.ml_products ADD COLUMN slug VARCHAR(200) UNIQUE;
            RAISE NOTICE '✓ 添加字段: ml_products.slug';
        END IF;
        
        -- 标签
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'tags') THEN
            ALTER TABLE public.ml_products ADD COLUMN tags TEXT[];
            RAISE NOTICE '✓ 添加字段: ml_products.tags';
        END IF;
        
        -- 是否特色商品
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'is_featured') THEN
            ALTER TABLE public.ml_products ADD COLUMN is_featured BOOLEAN DEFAULT FALSE;
            RAISE NOTICE '✓ 添加字段: ml_products.is_featured';
        END IF;
        
        -- 是否新品
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'is_new') THEN
            ALTER TABLE public.ml_products ADD COLUMN is_new BOOLEAN DEFAULT FALSE;
            RAISE NOTICE '✓ 添加字段: ml_products.is_new';
        END IF;
        
        -- 是否热销
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'is_hot') THEN
            ALTER TABLE public.ml_products ADD COLUMN is_hot BOOLEAN DEFAULT FALSE;
            RAISE NOTICE '✓ 添加字段: ml_products.is_hot';
        END IF;
        
        -- 浏览次数
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'view_count') THEN
            ALTER TABLE public.ml_products ADD COLUMN view_count INTEGER DEFAULT 0;
            RAISE NOTICE '✓ 添加字段: ml_products.view_count';
        END IF;
        
        -- 销售数量
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'sale_count') THEN
            ALTER TABLE public.ml_products ADD COLUMN sale_count INTEGER DEFAULT 0;
            RAISE NOTICE '✓ 添加字段: ml_products.sale_count';
        END IF;
        
        -- 收藏数量
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'favorite_count') THEN
            ALTER TABLE public.ml_products ADD COLUMN favorite_count INTEGER DEFAULT 0;
            RAISE NOTICE '✓ 添加字段: ml_products.favorite_count';
        END IF;
        
        RAISE NOTICE '>> ml_products 表字段检查完成';
    ELSE
        RAISE NOTICE '○ ml_products 表不存在，跳过字段添加';
    END IF;
END $$;

-- 为 ml_categories 表添加SEO字段
DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_categories') THEN
        -- SEO标题
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_categories' AND column_name = 'seo_title') THEN
            ALTER TABLE public.ml_categories ADD COLUMN seo_title VARCHAR(200);
            RAISE NOTICE '✓ 添加字段: ml_categories.seo_title';
        END IF;
        
        -- SEO描述
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_categories' AND column_name = 'seo_description') THEN
            ALTER TABLE public.ml_categories ADD COLUMN seo_description VARCHAR(500);
            RAISE NOTICE '✓ 添加字段: ml_categories.seo_description';
        END IF;
        
        -- URL slug
        IF NOT EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_categories' AND column_name = 'slug') THEN
            ALTER TABLE public.ml_categories ADD COLUMN slug VARCHAR(200) UNIQUE;
            RAISE NOTICE '✓ 添加字段: ml_categories.slug';
        END IF;
        
        RAISE NOTICE '>> ml_categories 表字段检查完成';
    ELSE
        RAISE NOTICE '○ ml_categories 表不存在，跳过字段添加';
    END IF;
END $$;

-- =====================================================================================
-- 4. 创建CID字段索引（SEO优化必需）
-- =====================================================================================

-- 为CID字段创建索引
DO $$
BEGIN
    -- ml_categories cid 索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_categories' AND column_name = 'cid') THEN
        CREATE INDEX IF NOT EXISTS idx_ml_categories_cid ON public.ml_categories(cid);
        RAISE NOTICE '✓ 创建索引: idx_ml_categories_cid';
    END IF;
    
    -- ml_brands cid 索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_brands' AND column_name = 'cid') THEN
        CREATE INDEX IF NOT EXISTS idx_ml_brands_cid ON public.ml_brands(cid);
        RAISE NOTICE '✓ 创建索引: idx_ml_brands_cid';
    END IF;
    
    -- ml_products cid 索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'cid') THEN
        CREATE INDEX IF NOT EXISTS idx_ml_products_cid ON public.ml_products(cid);
        RAISE NOTICE '✓ 创建索引: idx_ml_products_cid';
    END IF;
    
    -- ml_shops cid 索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_shops' AND column_name = 'cid') THEN
        CREATE INDEX IF NOT EXISTS idx_ml_shops_cid ON public.ml_shops(cid);
        RAISE NOTICE '✓ 创建索引: idx_ml_shops_cid';
    END IF;
    
    -- ml_orders cid 索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_orders' AND column_name = 'cid') THEN
        CREATE INDEX IF NOT EXISTS idx_ml_orders_cid ON public.ml_orders(cid);
        RAISE NOTICE '✓ 创建索引: idx_ml_orders_cid';
    END IF;
    
    RAISE NOTICE '>> CID 索引创建完成';
END $$;

-- =====================================================================================
-- 5. 创建索引（仅在字段存在时创建）
-- =====================================================================================

-- ak_users 表索引
DO $$
BEGIN
    -- 商城状态索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'mall_status') THEN
        CREATE INDEX IF NOT EXISTS idx_ak_users_mall_status ON public.ak_users(mall_status);
        RAISE NOTICE '✓ 创建索引: idx_ak_users_mall_status';
    END IF;
    
    -- 商城类型索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'mall_type') THEN
        CREATE INDEX IF NOT EXISTS idx_ak_users_mall_type ON public.ak_users(mall_type);
        RAISE NOTICE '✓ 创建索引: idx_ak_users_mall_type';
    END IF;
    
    -- 订单数量索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'total_orders') THEN
        CREATE INDEX IF NOT EXISTS idx_ak_users_total_orders ON public.ak_users(total_orders DESC);
        RAISE NOTICE '✓ 创建索引: idx_ak_users_total_orders';
    END IF;
    
    -- 消费金额索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'total_spent') THEN
        CREATE INDEX IF NOT EXISTS idx_ak_users_total_spent ON public.ak_users(total_spent DESC);
        RAISE NOTICE '✓ 创建索引: idx_ak_users_total_spent';
    END IF;
    
    -- 用户等级索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'user_level') THEN
        CREATE INDEX IF NOT EXISTS idx_ak_users_level ON public.ak_users(user_level);
        RAISE NOTICE '✓ 创建索引: idx_ak_users_level';
    END IF;
    
    -- 积分索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'points') THEN
        CREATE INDEX IF NOT EXISTS idx_ak_users_points ON public.ak_users(points DESC);
        RAISE NOTICE '✓ 创建索引: idx_ak_users_points';
    END IF;
    
    -- 认证状态索引
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'verified_status') THEN
        CREATE INDEX IF NOT EXISTS idx_ak_users_verified ON public.ak_users(verified_status);
        RAISE NOTICE '✓ 创建索引: idx_ak_users_verified';
    END IF;
    
    RAISE NOTICE '>> ak_users 表索引创建完成';
END $$;

-- ml_products 表索引
DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_products') THEN
        -- slug 索引
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'slug') THEN
            CREATE INDEX IF NOT EXISTS idx_ml_products_slug ON public.ml_products(slug);
            RAISE NOTICE '✓ 创建索引: idx_ml_products_slug';
        END IF;
        
        -- 特色商品索引
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'is_featured') THEN
            CREATE INDEX IF NOT EXISTS idx_ml_products_featured ON public.ml_products(is_featured, status);
            RAISE NOTICE '✓ 创建索引: idx_ml_products_featured';
        END IF;
        
        -- 标签索引
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'tags') THEN
            CREATE INDEX IF NOT EXISTS idx_ml_products_tags ON public.ml_products USING GIN(tags);
            RAISE NOTICE '✓ 创建索引: idx_ml_products_tags (GIN)';
        END IF;
        
        -- 浏览量索引
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'view_count') THEN
            CREATE INDEX IF NOT EXISTS idx_ml_products_view_count ON public.ml_products(view_count DESC);
            RAISE NOTICE '✓ 创建索引: idx_ml_products_view_count';
        END IF;
        
        -- 销量索引
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'sale_count') THEN
            CREATE INDEX IF NOT EXISTS idx_ml_products_sale_count ON public.ml_products(sale_count DESC);
            RAISE NOTICE '✓ 创建索引: idx_ml_products_sale_count';
        END IF;
        
        RAISE NOTICE '>> ml_products 表索引创建完成';
    ELSE
        RAISE NOTICE '○ ml_products 表不存在，跳过索引创建';
    END IF;
END $$;

-- ml_categories 表索引
DO $$
BEGIN
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_categories') THEN
        -- slug 索引
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_categories' AND column_name = 'slug') THEN
            CREATE INDEX IF NOT EXISTS idx_ml_categories_slug ON public.ml_categories(slug);
            RAISE NOTICE '✓ 创建索引: idx_ml_categories_slug';
        END IF;
        
        RAISE NOTICE '>> ml_categories 表索引创建完成';
    ELSE
        RAISE NOTICE '○ ml_categories 表不存在，跳过索引创建';
    END IF;
END $$;

-- =====================================================================================
-- 6. 创建或更新约束
-- =====================================================================================

DO $$
BEGIN
    -- ak_users 表约束检查
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'mall_status') THEN
        -- 检查约束是否存在，不存在则添加
        IF NOT EXISTS (SELECT 1 FROM information_schema.check_constraints WHERE constraint_name = 'chk_ak_users_mall_status') THEN
            ALTER TABLE public.ak_users ADD CONSTRAINT chk_ak_users_mall_status CHECK (mall_status IN (1,2));
            RAISE NOTICE '✓ 添加约束: chk_ak_users_mall_status';
        END IF;
    END IF;
    
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'mall_type') THEN
        IF NOT EXISTS (SELECT 1 FROM information_schema.check_constraints WHERE constraint_name = 'chk_ak_users_mall_type') THEN
            ALTER TABLE public.ak_users ADD CONSTRAINT chk_ak_users_mall_type CHECK (mall_type IN (1,2,3));
            RAISE NOTICE '✓ 添加约束: chk_ak_users_mall_type';
        END IF;
    END IF;
    
    IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ak_users' AND column_name = 'verified_status') THEN
        IF NOT EXISTS (SELECT 1 FROM information_schema.check_constraints WHERE constraint_name = 'chk_ak_users_verified_status') THEN
            ALTER TABLE public.ak_users ADD CONSTRAINT chk_ak_users_verified_status CHECK (verified_status IN (0,1,2));
            RAISE NOTICE '✓ 添加约束: chk_ak_users_verified_status';
        END IF;
    END IF;
    
    RAISE NOTICE '>> 约束检查完成';
END $$;

-- =====================================================================================
-- 7. 创建SEO相关函数
-- =====================================================================================

-- 根据 cid 获取商品信息 (SEO 友好)
CREATE OR REPLACE FUNCTION public.get_product_by_cid(p_cid INTEGER)
RETURNS TABLE (
    id UUID,
    cid INTEGER,
    name VARCHAR,
    slug VARCHAR,
    description TEXT,
    main_image_url TEXT,
    base_price DECIMAL,
    rating_avg DECIMAL,
    sale_count INTEGER
) AS $$
BEGIN
    RETURN QUERY
    SELECT 
        p.id,
        p.cid,
        p.name,
        p.slug,
        p.description,
        p.main_image_url,
        p.base_price,
        p.rating_avg,
        p.sale_count
    FROM public.ml_products p
    WHERE p.cid = p_cid AND p.status = 1;
END;
$$ LANGUAGE plpgsql;

-- 根据 cid 获取分类信息 (SEO 友好)
CREATE OR REPLACE FUNCTION public.get_category_by_cid(p_cid INTEGER)
RETURNS TABLE (
    id UUID,
    cid INTEGER,
    name VARCHAR,
    slug VARCHAR,
    description TEXT,
    icon_url TEXT,
    path TEXT[]
) AS $$
BEGIN
    RETURN QUERY
    SELECT 
        c.id,
        c.cid,
        c.name,
        c.slug,
        c.description,
        c.icon_url,
        c.path
    FROM public.ml_categories c
    WHERE c.cid = p_cid AND c.is_active = TRUE;
END;
$$ LANGUAGE plpgsql;

-- 根据 cid 获取品牌信息 (SEO 友好)
CREATE OR REPLACE FUNCTION public.get_brand_by_cid(p_cid INTEGER)
RETURNS TABLE (
    id UUID,
    cid INTEGER,
    name VARCHAR,
    logo_url TEXT,
    description TEXT
) AS $$
BEGIN
    RETURN QUERY
    SELECT 
        b.id,
        b.cid,
        b.name,
        b.logo_url,
        b.description
    FROM public.ml_brands b
    WHERE b.cid = p_cid AND b.is_active = TRUE;
END;
$$ LANGUAGE plpgsql;

-- 根据 cid 获取店铺信息 (SEO 友好)
CREATE OR REPLACE FUNCTION public.get_shop_by_cid(p_cid INTEGER)
RETURNS TABLE (
    id UUID,
    cid INTEGER,
    shop_name VARCHAR,
    description TEXT,
    shop_logo TEXT,
    rating_avg DECIMAL,
    product_count INTEGER
) AS $$
BEGIN
    RETURN QUERY
    SELECT 
        s.id,
        s.cid,
        s.shop_name,
        s.description,
        s.shop_logo,
        s.rating_avg,
        s.product_count
    FROM public.ml_shops s
    WHERE s.cid = p_cid AND s.status = 1;
END;
$$ LANGUAGE plpgsql;

-- 生成 SEO 友好的 URL 路径
CREATE OR REPLACE FUNCTION public.generate_seo_url(
    p_type VARCHAR, -- 'product', 'category', 'brand', 'shop'
    p_cid INTEGER,
    p_slug VARCHAR DEFAULT NULL
)
RETURNS TEXT AS $$
DECLARE
    url_path TEXT;
BEGIN
    CASE p_type
        WHEN 'product' THEN
            url_path := '/product/' || p_cid;
            IF p_slug IS NOT NULL THEN
                url_path := url_path || '/' || p_slug;
            END IF;
        WHEN 'category' THEN
            url_path := '/category/' || p_cid;
            IF p_slug IS NOT NULL THEN
                url_path := url_path || '/' || p_slug;
            END IF;
        WHEN 'brand' THEN
            url_path := '/brand/' || p_cid;
            IF p_slug IS NOT NULL THEN
                url_path := url_path || '/' || p_slug;
            END IF;
        WHEN 'shop' THEN
            url_path := '/shop/' || p_cid;
            IF p_slug IS NOT NULL THEN
                url_path := url_path || '/' || p_slug;
            END IF;
        ELSE
            url_path := '/' || p_type || '/' || p_cid;
    END CASE;
    
    RETURN url_path;
END;
$$ LANGUAGE plpgsql;

-- 批量更新 slug 字段的函数
CREATE OR REPLACE FUNCTION public.update_seo_slugs()
RETURNS VOID AS $$
BEGIN
    -- 更新商品 slug
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_products') THEN
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_products' AND column_name = 'slug') THEN
            UPDATE public.ml_products 
            SET slug = LOWER(REGEXP_REPLACE(TRIM(name), '[^a-zA-Z0-9\u4e00-\u9fa5]+', '-', 'g'))
            WHERE slug IS NULL OR slug = '';
        END IF;
    END IF;
    
    -- 更新分类 slug  
    IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'ml_categories') THEN
        IF EXISTS (SELECT 1 FROM information_schema.columns WHERE table_name = 'ml_categories' AND column_name = 'slug') THEN
            UPDATE public.ml_categories 
            SET slug = LOWER(REGEXP_REPLACE(TRIM(name), '[^a-zA-Z0-9\u4e00-\u9fa5]+', '-', 'g'))
            WHERE slug IS NULL OR slug = '';
        END IF;
    END IF;
    
    RAISE NOTICE 'SEO slugs updated successfully';
END;
$$ LANGUAGE plpgsql;

-- =====================================================================================
-- 8. 创建基础函数（如果不存在）
-- =====================================================================================

-- 更新用户商城统计数据的函数
CREATE OR REPLACE FUNCTION public.update_user_mall_stats(p_user_id UUID)
RETURNS VOID AS $$
BEGIN
    UPDATE public.ak_users 
    SET 
        total_orders = (
            SELECT COUNT(*) 
            FROM public.ml_orders 
            WHERE user_id = p_user_id AND order_status = 4
        ),
        total_spent = (
            SELECT COALESCE(SUM(total_amount), 0) 
            FROM public.ml_orders 
            WHERE user_id = p_user_id AND order_status = 4
        )
    WHERE id = p_user_id;
END;
$$ LANGUAGE plpgsql;

-- 为用户计算等级的函数
CREATE OR REPLACE FUNCTION public.calculate_user_level(p_total_spent DECIMAL)
RETURNS INTEGER AS $$
BEGIN
    CASE 
        WHEN p_total_spent >= 100000 THEN RETURN 10;
        WHEN p_total_spent >= 50000 THEN RETURN 9;
        WHEN p_total_spent >= 20000 THEN RETURN 8;
        WHEN p_total_spent >= 10000 THEN RETURN 7;
        WHEN p_total_spent >= 5000 THEN RETURN 6;
        WHEN p_total_spent >= 2000 THEN RETURN 5;
        WHEN p_total_spent >= 1000 THEN RETURN 4;
        WHEN p_total_spent >= 500 THEN RETURN 3;
        WHEN p_total_spent >= 100 THEN RETURN 2;
        ELSE RETURN 1;
    END CASE;
END;
$$ LANGUAGE plpgsql;

-- 批量更新用户等级的函数
CREATE OR REPLACE FUNCTION public.update_all_user_levels()
RETURNS INTEGER AS $$
DECLARE
    affected_rows INTEGER := 0;
BEGIN
    UPDATE public.ak_users 
    SET user_level = public.calculate_user_level(total_spent)
    WHERE total_spent > 0;
    
    GET DIAGNOSTICS affected_rows = ROW_COUNT;
    RETURN affected_rows;
END;
$$ LANGUAGE plpgsql;

-- =====================================================================================
-- 9. 完成提示
-- =====================================================================================

DO $$
BEGIN
    RAISE NOTICE '=======================================================';
    RAISE NOTICE '商城系统字段增量添加完成！';
    RAISE NOTICE '=======================================================';
    RAISE NOTICE '执行内容：';
    RAISE NOTICE '✓ ak_users 表增加商城相关字段';
    RAISE NOTICE '✓ 商城核心表增加 cid 自增字段 (SEO优化)';
    RAISE NOTICE '✓ 现有商城表增加SEO和营销字段';
    RAISE NOTICE '✓ 创建相应的索引 (包括CID索引)';
    RAISE NOTICE '✓ 添加约束检查';
    RAISE NOTICE '✓ 创建SEO相关函数';
    RAISE NOTICE '✓ 创建实用函数';
    RAISE NOTICE '=======================================================';
    RAISE NOTICE '新增字段说明：';
    RAISE NOTICE '• ak_users.mall_status: 商城状态 (1:正常 2:禁用)';
    RAISE NOTICE '• ak_users.mall_type: 用户类型 (1:消费者 2:商家 3:其他)';
    RAISE NOTICE '• ak_users.total_orders: 总订单数';
    RAISE NOTICE '• ak_users.total_spent: 总消费金额';
    RAISE NOTICE '• ak_users.user_level: 用户等级 (1-10)';
    RAISE NOTICE '• ak_users.points: 用户积分';
    RAISE NOTICE '• ak_users.verified_status: 认证状态 (0:未认证 1:已认证 2:认证失败)';
    RAISE NOTICE '-------------------------------------------------------';
    RAISE NOTICE 'CID 字段说明 (SEO优化):';
    RAISE NOTICE '• ml_categories.cid: 分类SEO友好ID';
    RAISE NOTICE '• ml_brands.cid: 品牌SEO友好ID';
    RAISE NOTICE '• ml_products.cid: 商品SEO友好ID';
    RAISE NOTICE '• ml_shops.cid: 店铺SEO友好ID';
    RAISE NOTICE '• ml_orders.cid: 订单SEO友好ID';
    RAISE NOTICE '-------------------------------------------------------';
    RAISE NOTICE 'SEO 函数说明:';
    RAISE NOTICE '• get_product_by_cid(cid): 根据CID获取商品信息';
    RAISE NOTICE '• get_category_by_cid(cid): 根据CID获取分类信息';
    RAISE NOTICE '• get_brand_by_cid(cid): 根据CID获取品牌信息';
    RAISE NOTICE '• get_shop_by_cid(cid): 根据CID获取店铺信息';
    RAISE NOTICE '• generate_seo_url(type, cid, slug): 生成SEO友好URL';
    RAISE NOTICE '• update_seo_slugs(): 批量更新slug字段';
    RAISE NOTICE '=======================================================';
    RAISE NOTICE '使用建议：';
    RAISE NOTICE '1. 此脚本可安全重复执行';
    RAISE NOTICE '2. 使用 IF NOT EXISTS 检查避免重复操作';
    RAISE NOTICE '3. 建议在测试环境先执行验证';
    RAISE NOTICE '4. 可根据实际需要注释掉不需要的字段';
    RAISE NOTICE '5. 执行后可调用 update_seo_slugs() 初始化slug字段';
    RAISE NOTICE '=======================================================';
    RAISE NOTICE 'SEO URL 示例：';
    RAISE NOTICE '• 商品页面: /product/123/iphone-15-pro';
    RAISE NOTICE '• 分类页面: /category/45/digital-electronics';
    RAISE NOTICE '• 品牌页面: /brand/12/apple';
    RAISE NOTICE '• 店铺页面: /shop/88/official-store';
    RAISE NOTICE '=======================================================';
END $$;