package repository

import (
	"database/sql"
	"fmt"
	"strings"
)

// ComparableShopeeSpec 是一条可用于只读对比的蝦皮正式规格。
type ComparableShopeeSpec struct {
	Color   string
	Size    string
	ParseOK bool
}

// ShopSpecSource 汇总一件蝦皮商品及其关联 PDD 商品的原始对比数据。
type ShopSpecSource struct {
	ShopeeGoodsID string
	PDDGoodsID    string
	PDDExists     bool
	PDDDeleted    bool
	PDDSKUsJSON   string
	ShopeeSpecs   []ComparableShopeeSpec
}

// ListShopSpecSources 按店铺名精确读取规格对比数据。本函数只执行 SELECT。
func ListShopSpecSources(q Execer, shopName string) ([]ShopSpecSource, error) {
	rows, err := q.Query(`
		SELECT sp.goods_id, sp.pdd_goods_id,
		       pp.goods_id, pp.deleted_at, pp.skus_json,
		       sk.color, sk.size, sk.parse_ok
		  FROM shopee_products sp
		  LEFT JOIN shopee_skus sk ON sk.goods_id = sp.goods_id
		  LEFT JOIN pdd_products pp ON pp.goods_id = sp.pdd_goods_id
		 WHERE sp.shopee_shop_name = ?
		 ORDER BY sp.goods_id, sk.sku_id`, strings.TrimSpace(shopName))
	if err != nil {
		return nil, fmt.Errorf("读取店铺规格对比数据失败: %w", err)
	}
	defer rows.Close()

	var list []ShopSpecSource
	var current *ShopSpecSource
	for rows.Next() {
		var shopeeID string
		var pddID, existingPDDID, deletedAt, skusJSON sql.NullString
		var color, size sql.NullString
		var parseOK sql.NullInt64
		if err := rows.Scan(&shopeeID, &pddID, &existingPDDID, &deletedAt,
			&skusJSON, &color, &size, &parseOK); err != nil {
			return nil, fmt.Errorf("解析店铺规格对比数据失败: %w", err)
		}
		if current == nil || current.ShopeeGoodsID != shopeeID {
			list = append(list, ShopSpecSource{
				ShopeeGoodsID: shopeeID,
				PDDGoodsID:    pddID.String,
				PDDExists:     existingPDDID.Valid,
				PDDDeleted:    strings.TrimSpace(deletedAt.String) != "",
				PDDSKUsJSON:   skusJSON.String,
			})
			current = &list[len(list)-1]
		}
		if parseOK.Valid {
			current.ShopeeSpecs = append(current.ShopeeSpecs, ComparableShopeeSpec{
				Color: color.String, Size: size.String, ParseOK: parseOK.Int64 == 1,
			})
		}
	}
	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("遍历店铺规格对比数据失败: %w", err)
	}
	return list, nil
}