USE [JSDataMiddlePlatform];
GO

/*
  Template: SKU结构分析
  Window: 最近30天 [date_from, date_to)
*/

DECLARE @date_from datetime2 = CAST(DATEADD(DAY, -30, CAST(GETDATE() AS date)) AS datetime2);
DECLARE @date_to datetime2 = CAST(DATEADD(DAY, 1, CAST(GETDATE() AS date)) AS datetime2);

IF OBJECT_ID('tempdb..#base') IS NOT NULL
    DROP TABLE #base;

SELECT
    NULLIF(a.undefined2, '') AS order_id,
    NULLIF(a.undefined10, '') AS sku_id,
    COALESCE(NULLIF(a.undefined8, ''), 'unknown') AS shop_name,
    TRY_CONVERT(decimal(18, 2), NULLIF(a.undefined20, '')) AS qty,
    TRY_CONVERT(decimal(18, 2), NULLIF(a.undefined26, '')) AS payment_amount,
    TRY_CONVERT(decimal(18, 2), NULLIF(a.undefined29, '')) AS actual_amount,
    TRY_CONVERT(decimal(18, 2), NULLIF(a.undefined31, '')) AS actual_cost,
    TRY_CONVERT(decimal(18, 2), NULLIF(a.undefined52, '')) AS refund_amount,
    ISNULL(NULLIF(a.undefined62, ''), '') AS order_labels
INTO #base
FROM dbo.jst_goods_profit_kpi_items_afs AS a WITH (NOLOCK)
WHERE a.createdAt >= @date_from
  AND a.createdAt < @date_to
  AND ISNULL(NULLIF(a.undefined2, ''), '') <> ''
  AND ISNULL(NULLIF(a.undefined10, ''), '') <> ''
  AND ISNULL(NULLIF(a.undefined62, ''), '') NOT LIKE '%配件%'
  AND ISNULL(NULLIF(a.undefined62, ''), '') NOT LIKE '%特殊单%';

IF OBJECT_ID('tempdb..#sku_agg') IS NOT NULL
    DROP TABLE #sku_agg;

SELECT
    b.sku_id,
    ISNULL(NULLIF(s.name, ''), 'unknown') AS sku_name,
    ISNULL(NULLIF(s.other_1, ''), 'unknown') AS spu,
    ISNULL(NULLIF(s.category, ''), 'unknown') AS category,
    s.sale_price,
    COUNT(*) AS afs_record_count,
    COUNT(DISTINCT b.order_id) AS order_count,
    SUM(ISNULL(b.qty, 0)) AS qty_sum,
    SUM(ISNULL(b.payment_amount, 0)) AS payment_amount,
    SUM(ISNULL(b.actual_amount, 0)) AS actual_amount,
    SUM(ISNULL(b.actual_cost, 0)) AS actual_cost,
    SUM(ISNULL(b.refund_amount, 0)) AS refund_amount
INTO #sku_agg
FROM #base AS b
LEFT JOIN dbo.jst_sku AS s WITH (NOLOCK)
    ON s.sku_id = b.sku_id
GROUP BY
    b.sku_id,
    s.name,
    s.other_1,
    s.category,
    s.sale_price;

-- 1) 类目结构（按销售额）
SELECT TOP (20)
    category,
    COUNT(*) AS sku_count,
    SUM(payment_amount) AS payment_amount,
    CASE
        WHEN SUM(SUM(payment_amount)) OVER () = 0 THEN NULL
        ELSE SUM(payment_amount) / SUM(SUM(payment_amount)) OVER ()
    END AS payment_share
FROM #sku_agg
GROUP BY category
ORDER BY payment_amount DESC;

-- 2) SKU TOP50（按销售额）
SELECT TOP (50)
    sku_id,
    sku_name,
    spu,
    category,
    sale_price,
    order_count,
    qty_sum,
    payment_amount,
    refund_amount,
    CASE
        WHEN payment_amount = 0 THEN NULL
        ELSE refund_amount / payment_amount
    END AS refund_rate,
    actual_amount - actual_cost AS gross_profit,
    CASE
        WHEN actual_amount = 0 THEN NULL
        ELSE (actual_amount - actual_cost) / actual_amount
    END AS gross_margin_rate
FROM #sku_agg
ORDER BY payment_amount DESC;

-- 3) 价格带结构
WITH price_band AS (
    SELECT
        CASE
            WHEN sale_price IS NULL THEN '未知价格'
            WHEN sale_price < 100 THEN '0-99'
            WHEN sale_price < 200 THEN '100-199'
            WHEN sale_price < 300 THEN '200-299'
            WHEN sale_price < 500 THEN '300-499'
            ELSE '500+'
        END AS price_band,
        payment_amount,
        order_count,
        refund_amount
    FROM #sku_agg
)
SELECT
    price_band,
    SUM(order_count) AS order_count,
    SUM(payment_amount) AS payment_amount,
    SUM(refund_amount) AS refund_amount,
    CASE
        WHEN SUM(payment_amount) = 0 THEN NULL
        ELSE SUM(refund_amount) / SUM(payment_amount)
    END AS refund_rate
FROM price_band
GROUP BY price_band
ORDER BY payment_amount DESC;