affiliate_dash/backend/internal/service/skin.go

package service

import (
	"errors"

	"affiliate_dash/internal/model"

	"gorm.io/gorm"
)

type SkinService struct {
	db *gorm.DB
}

func NewSkinService(db *gorm.DB) *SkinService {
	return &SkinService{db: db}
}

type SkinListQuery struct {
	Page     int
	Size     int
	Keyword  string
	Game     string
	Category string
	Status   *int
}

func (s *SkinService) List(q SkinListQuery) ([]model.Skin, int64, error) {
	if q.Page < 1 {
		q.Page = 1
	}
	if q.Size < 1 || q.Size > 100 {
		q.Size = 20
	}
	tx := s.db.Model(&model.Skin{})
	if q.Keyword != "" {
		like := "%" + q.Keyword + "%"
		tx = tx.Where("name LIKE ? OR sku LIKE ?", like, like)
	}
	if q.Game != "" {
		tx = tx.Where("game = ?", q.Game)
	}
	if q.Category != "" {
		tx = tx.Where("category = ?", q.Category)
	}
	if q.Status != nil {
		tx = tx.Where("status = ?", *q.Status)
	}
	var total int64
	if err := tx.Count(&total).Error; err != nil {
		return nil, 0, err
	}
	var list []model.Skin
	err := tx.Order("id DESC").Offset((q.Page - 1) * q.Size).Limit(q.Size).Find(&list).Error
	return list, total, err
}

func (s *SkinService) Get(id uint) (*model.Skin, error) {
	var skin model.Skin
	if err := s.db.First(&skin, id).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errors.New("皮肤不存在")
		}
		return nil, err
	}
	return &skin, nil
}

func (s *SkinService) Create(skin *model.Skin) error {
	return s.db.Create(skin).Error
}

func (s *SkinService) Update(id uint, updates map[string]interface{}) error {
	res := s.db.Model(&model.Skin{}).Where("id = ?", id).Updates(updates)
	if res.Error != nil {
		return res.Error
	}
	if res.RowsAffected == 0 {
		return errors.New("皮肤不存在")
	}
	return nil
}

func (s *SkinService) Delete(id uint) error {
	res := s.db.Delete(&model.Skin{}, id)
	if res.Error != nil {
		return res.Error
	}
	if res.RowsAffected == 0 {
		return errors.New("皮肤不存在")
	}
	return nil
}

// SeedCatalog 按 sku 幂等导入商品目录（已存在则跳过）
func (s *SkinService) SeedCatalog() error {
	// 清理早期无 sku 的演示数据，避免唯一索引冲突
	_ = s.db.Where("sku = ? OR sku IS NULL", "").Delete(&model.Skin{}).Error

	for _, item := range peaceEliteCatalog {
		var existing model.Skin
		err := s.db.Where("sku = ?", item.SKU).First(&existing).Error
		if err == nil {
			// 已存在：仅同步默认佣金为 0（不改价格等业务字段）
			if existing.Commission != 0 {
				_ = s.db.Model(&existing).Update("commission", 0).Error
			}
			continue
		}
		if !errors.Is(err, gorm.ErrRecordNotFound) {
			return err
		}
		skin := model.Skin{
			Name:       item.Name,
			SKU:        item.SKU,
			Game:       "和平精英",
			Category:   item.Category,
			Price:      0,
			CostPrice:  0,
			Commission: 0,
			Stock:      -1,
			Status:     1,
		}
		if err := s.db.Create(&skin).Error; err != nil {
			return err
		}
	}
	return nil
}

type catalogItem struct {
	Name     string
	SKU      string
	Category string
}

// 和平精英商品目录（中文名保持原样，英文名为固定 sku）
var peaceEliteCatalog = []catalogItem{
	{Name: "套装-Alan Walker", SKU: "suit_alan_walker", Category: "套装"},
	{Name: "套装-暗影哥特", SKU: "suit_shadow_gothic", Category: "套装"},
	{Name: "黑色高级特训官上衣", SKU: "top_black_elite_trainer", Category: "上衣"},
	{Name: "M416-仓鼠灰灰", SKU: "m416_hamster_gray", Category: "枪械"},
	{Name: "萌熊伴侣背包", SKU: "bag_cute_bear", Category: "背包"},
	{Name: "套装-双彩绵绵", SKU: "suit_dual_fluffy", Category: "套装"},
	{Name: "套装-糯粉咩咩", SKU: "suit_pink_sheep", Category: "套装"},
	{Name: "套装-恋恋初桃", SKU: "suit_first_peach", Category: "套装"},
	{Name: "套装-浪漫天命", SKU: "suit_romantic_destiny", Category: "套装"},
	{Name: "西部牛仔大礼包", SKU: "pack_western_cowboy", Category: "礼包"},
	{Name: "烟雾弹-糯粉咩咩", SKU: "smoke_pink_sheep", Category: "投掷物"},
	{Name: "破片手榴弹-糯粉咩咩", SKU: "frag_pink_sheep", Category: "投掷物"},
	{Name: "套装-仓鼠灰灰", SKU: "suit_hamster_gray", Category: "套装"},
	{Name: "套装-萌熊伴侣", SKU: "suit_cute_bear", Category: "套装"},
	{Name: "糯粉咩咩背包", SKU: "bag_pink_sheep", Category: "背包"},
	{Name: "糯粉咩咩头盔", SKU: "helmet_pink_sheep", Category: "头盔"},
	{Name: "仓鼠灰灰背包", SKU: "bag_hamster_gray", Category: "背包"},
	{Name: "仓鼠灰灰头盔", SKU: "helmet_hamster_gray", Category: "头盔"},
	{Name: "套装-西部谜踪", SKU: "suit_western_mystery", Category: "套装"},
	{Name: "国宝胖达头盔", SKU: "helmet_panda_treasure", Category: "头盔"},
	{Name: "套装-胖达圆圆", SKU: "suit_panda_round", Category: "套装"},
	{Name: "套装-胖达团团", SKU: "suit_panda_tuan", Category: "套装"},
	{Name: "熔岩游骑兵礼包", SKU: "pack_lava_ranger", Category: "礼包"},
	{Name: "套装-狂沙舞者", SKU: "suit_sand_dancer", Category: "套装"},
	{Name: "星际漫游服装礼包", SKU: "pack_star_roam_outfit", Category: "礼包"},
	{Name: "星际漫游枪械礼包", SKU: "pack_star_roam_weapon", Category: "礼包"},
	{Name: "套装-绵云熊熊", SKU: "suit_cloud_bear", Category: "套装"},
}