-- ===================================================================
-- 基于现有 ak_global_config 表的优化查询函数
-- 保持现有表结构，添加便捷的多语言查询支持
-- ===================================================================

-- 1. 为现有表添加分类字段（可选）
-- ALTER TABLE public.ak_global_config ADD COLUMN IF NOT EXISTS config_category VARCHAR(50) DEFAULT 'general';
-- CREATE INDEX IF NOT EXISTS idx_ak_global_config_category ON public.ak_global_config(config_category);

-- 2. 创建便捷的多语言配置查询函数
CREATE OR REPLACE FUNCTION get_global_config_by_language(
    p_language_code VARCHAR(10) DEFAULT 'zh'
) RETURNS TABLE (
    config_key VARCHAR(100),
    config_value TEXT,
    config_type VARCHAR(50),
    description TEXT,
    base_key VARCHAR(100)
) AS $$
DECLARE
    lang_suffix TEXT;
BEGIN
    -- 根据语言代码确定后缀
    CASE p_language_code
        WHEN 'zh' THEN lang_suffix := '_zh';
        WHEN 'en' THEN lang_suffix := '_en';
        WHEN 'tw' THEN lang_suffix := '_tw';
        WHEN 'ja' THEN lang_suffix := '_ja';
        ELSE lang_suffix := '_zh'; -- 默认中文
    END CASE;
    
    RETURN QUERY
    SELECT 
        gc.config_key,
        gc.config_value,
        gc.config_type,
        gc.description,
        -- 提取基础key（去掉语言后缀）
        CASE 
            WHEN gc.config_key LIKE '%_zh' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
            WHEN gc.config_key LIKE '%_en' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
            WHEN gc.config_key LIKE '%_tw' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
            WHEN gc.config_key LIKE '%_ja' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
            ELSE gc.config_key
        END AS base_key
    FROM public.ak_global_config gc
    WHERE gc.is_active = true 
        AND (
            gc.config_key LIKE '%' || lang_suffix
            OR gc.config_key NOT LIKE '%_zh' 
            AND gc.config_key NOT LIKE '%_en' 
            AND gc.config_key NOT LIKE '%_tw' 
            AND gc.config_key NOT LIKE '%_ja'
        )
    ORDER BY gc.config_key;
END;
$$ LANGUAGE plpgsql;

-- 3. 获取单个配置值的函数
CREATE OR REPLACE FUNCTION get_global_config_value(
    p_base_key VARCHAR(100),
    p_language_code VARCHAR(10) DEFAULT 'zh'
) RETURNS TEXT AS $$
DECLARE
    lang_suffix TEXT;
    config_value TEXT;
BEGIN
    -- 根据语言代码确定后缀
    CASE p_language_code
        WHEN 'zh' THEN lang_suffix := '_zh';
        WHEN 'en' THEN lang_suffix := '_en';
        WHEN 'tw' THEN lang_suffix := '_tw';
        WHEN 'ja' THEN lang_suffix := '_ja';
        ELSE lang_suffix := '_zh';
    END CASE;
    
    -- 先尝试获取带语言后缀的配置
    SELECT gc.config_value INTO config_value
    FROM public.ak_global_config gc
    WHERE gc.config_key = p_base_key || lang_suffix
        AND gc.is_active = true;
    
    -- 如果没找到，尝试获取不带后缀的配置（通用配置）
    IF config_value IS NULL THEN
        SELECT gc.config_value INTO config_value
        FROM public.ak_global_config gc
        WHERE gc.config_key = p_base_key
            AND gc.is_active = true;
    END IF;
    
    -- 如果还是没找到，尝试获取中文版本作为默认
    IF config_value IS NULL AND lang_suffix != '_zh' THEN
        SELECT gc.config_value INTO config_value
        FROM public.ak_global_config gc
        WHERE gc.config_key = p_base_key || '_zh'
            AND gc.is_active = true;
    END IF;
    
    RETURN config_value;
END;
$$ LANGUAGE plpgsql;

-- 4. 获取公司信息的便捷函数
CREATE OR REPLACE FUNCTION get_company_config(
    p_language_code VARCHAR(10) DEFAULT 'zh'
) RETURNS TABLE (
    company_name TEXT,
    company_slogan TEXT,
    company_address TEXT,
    company_phone TEXT,
    company_email TEXT,
    company_icp TEXT,
    company_logo_url TEXT
) AS $$
BEGIN
    RETURN QUERY
    SELECT 
        get_global_config_value('company_name', p_language_code),
        get_global_config_value('company_slogan', p_language_code),
        get_global_config_value('company_address', p_language_code),
        get_global_config_value('company_phone', p_language_code),
        get_global_config_value('company_email', p_language_code),
        get_global_config_value('company_icp', p_language_code),
        get_global_config_value('company_logo_url', p_language_code);
END;
$$ LANGUAGE plpgsql;

-- 5. 获取热门搜索关键词的函数
CREATE OR REPLACE FUNCTION get_hot_search_keywords(
    p_language_code VARCHAR(10) DEFAULT 'zh'
) RETURNS TABLE (
    search_term TEXT,
    sort_order INTEGER
) AS $$
BEGIN
    RETURN QUERY
    SELECT 
        get_global_config_value('hot_search_' || generate_series, p_language_code) AS search_term,
        generate_series AS sort_order
    FROM generate_series(1, 5)
    WHERE get_global_config_value('hot_search_' || generate_series, p_language_code) IS NOT NULL;
END;
$$ LANGUAGE plpgsql;

-- 6. 获取社交媒体链接的函数
CREATE OR REPLACE FUNCTION get_social_media_config(
    p_language_code VARCHAR(10) DEFAULT 'zh'
) RETURNS TABLE (
    wechat_url TEXT,
    weibo_url TEXT,
    qq_url TEXT,
    linkedin_url TEXT,
    twitter_url TEXT
) AS $$
BEGIN
    RETURN QUERY
    SELECT 
        get_global_config_value('social_wechat_url', p_language_code),
        get_global_config_value('social_weibo_url', p_language_code),
        get_global_config_value('social_qq_url', p_language_code),
        get_global_config_value('social_linkedin_url', p_language_code),
        get_global_config_value('social_twitter_url', p_language_code);
END;
$$ LANGUAGE plpgsql;

-- 7. 创建优化的配置视图
CREATE OR REPLACE VIEW public.vw_global_config_by_language AS
SELECT 
    gc.config_key,
    gc.config_value,
    gc.config_type,
    gc.description,
    gc.is_active,
    -- 提取语言代码
    CASE 
        WHEN gc.config_key LIKE '%_zh' THEN 'zh'
        WHEN gc.config_key LIKE '%_en' THEN 'en'
        WHEN gc.config_key LIKE '%_tw' THEN 'tw'
        WHEN gc.config_key LIKE '%_ja' THEN 'ja'
        ELSE 'common' -- 无语言后缀的通用配置
    END AS language_code,
    -- 提取基础配置键
    CASE 
        WHEN gc.config_key LIKE '%_zh' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
        WHEN gc.config_key LIKE '%_en' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
        WHEN gc.config_key LIKE '%_tw' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
        WHEN gc.config_key LIKE '%_ja' THEN LEFT(gc.config_key, LENGTH(gc.config_key) - 3)
        ELSE gc.config_key
    END AS base_key,
    -- 配置分类（基于键名推断）
    CASE 
        WHEN gc.config_key LIKE 'company_%' THEN 'company'
        WHEN gc.config_key LIKE 'social_%' THEN 'social'
        WHEN gc.config_key LIKE 'hot_search_%' THEN 'search'
        ELSE 'general'
    END AS config_category
FROM public.ak_global_config gc
WHERE gc.is_active = true;

-- 8. 添加函数注释
COMMENT ON FUNCTION get_global_config_by_language IS '获取指定语言的全局配置（基于现有表结构）';
COMMENT ON FUNCTION get_global_config_value IS '获取单个配置值，支持语言回退';
COMMENT ON FUNCTION get_company_config IS '获取公司信息配置';
COMMENT ON FUNCTION get_hot_search_keywords IS '获取热门搜索关键词';
COMMENT ON FUNCTION get_social_media_config IS '获取社交媒体配置';
COMMENT ON VIEW vw_global_config_by_language IS '按语言分组的全局配置视图';

-- 9. 测试查询示例
DO $$
BEGIN
    RAISE NOTICE '========================================';
    RAISE NOTICE '基于现有表结构的优化查询函数已创建！';
    RAISE NOTICE '========================================';
    RAISE NOTICE '使用示例：';
    RAISE NOTICE '-- 获取中文配置：SELECT * FROM get_global_config_by_language(''zh'');';
    RAISE NOTICE '-- 获取公司名称：SELECT get_global_config_value(''company_name'', ''zh'');';
    RAISE NOTICE '-- 获取公司信息：SELECT * FROM get_company_config(''zh'');';
    RAISE NOTICE '-- 获取热门搜索：SELECT * FROM get_hot_search_keywords(''zh'');';
    RAISE NOTICE '-- 查看配置视图：SELECT * FROM vw_global_config_by_language WHERE language_code = ''zh'';';
    RAISE NOTICE '========================================';
END
$$;