backend/internal/repository/texture_repository.go

package repository

import (
	"carrotskin/internal/model"
	"carrotskin/pkg/database"
	"gorm.io/gorm"
)

// CreateTexture 创建材质
func CreateTexture(texture *model.Texture) error {
	db := database.MustGetDB()
	return db.Create(texture).Error
}

// FindTextureByID 根据ID查找材质
func FindTextureByID(id int64) (*model.Texture, error) {
	db := database.MustGetDB()
	var texture model.Texture
	err := db.Preload("Uploader").First(&texture, id).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, nil
		}
		return nil, err
	}
	return &texture, nil
}

// FindTextureByHash 根据Hash查找材质
func FindTextureByHash(hash string) (*model.Texture, error) {
	db := database.MustGetDB()
	var texture model.Texture
	err := db.Where("hash = ?", hash).First(&texture).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, nil
		}
		return nil, err
	}
	return &texture, nil
}

// FindTexturesByUploaderID 根据上传者ID查找材质列表
func FindTexturesByUploaderID(uploaderID int64, page, pageSize int) ([]*model.Texture, int64, error) {
	db := database.MustGetDB()
	var textures []*model.Texture
	var total int64

	query := db.Model(&model.Texture{}).Where("uploader_id = ? AND status != -1", uploaderID)

	// 获取总数
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	// 分页查询
	offset := (page - 1) * pageSize
	err := query.Preload("Uploader").
		Order("created_at DESC").
		Offset(offset).
		Limit(pageSize).
		Find(&textures).Error

	if err != nil {
		return nil, 0, err
	}

	return textures, total, nil
}

// SearchTextures 搜索材质
func SearchTextures(keyword string, textureType model.TextureType, publicOnly bool, page, pageSize int) ([]*model.Texture, int64, error) {
	db := database.MustGetDB()
	var textures []*model.Texture
	var total int64

	query := db.Model(&model.Texture{}).Where("status = 1")

	// 公开筛选
	if publicOnly {
		query = query.Where("is_public = ?", true)
	}

	// 类型筛选
	if textureType != "" {
		query = query.Where("type = ?", textureType)
	}

	// 关键词搜索
	if keyword != "" {
		query = query.Where("name LIKE ? OR description LIKE ?", "%"+keyword+"%", "%"+keyword+"%")
	}

	// 获取总数
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	// 分页查询
	offset := (page - 1) * pageSize
	err := query.Preload("Uploader").
		Order("created_at DESC").
		Offset(offset).
		Limit(pageSize).
		Find(&textures).Error

	if err != nil {
		return nil, 0, err
	}

	return textures, total, nil
}

// UpdateTexture 更新材质
func UpdateTexture(texture *model.Texture) error {
	db := database.MustGetDB()
	return db.Save(texture).Error
}

// UpdateTextureFields 更新材质指定字段
func UpdateTextureFields(id int64, fields map[string]interface{}) error {
	db := database.MustGetDB()
	return db.Model(&model.Texture{}).Where("id = ?", id).Updates(fields).Error
}

// DeleteTexture 删除材质（软删除）
func DeleteTexture(id int64) error {
	db := database.MustGetDB()
	return db.Model(&model.Texture{}).Where("id = ?", id).Update("status", -1).Error
}

// IncrementTextureDownloadCount 增加下载次数
func IncrementTextureDownloadCount(id int64) error {
	db := database.MustGetDB()
	return db.Model(&model.Texture{}).Where("id = ?", id).
		UpdateColumn("download_count", gorm.Expr("download_count + ?", 1)).Error
}

// IncrementTextureFavoriteCount 增加收藏次数
func IncrementTextureFavoriteCount(id int64) error {
	db := database.MustGetDB()
	return db.Model(&model.Texture{}).Where("id = ?", id).
		UpdateColumn("favorite_count", gorm.Expr("favorite_count + ?", 1)).Error
}

// DecrementTextureFavoriteCount 减少收藏次数
func DecrementTextureFavoriteCount(id int64) error {
	db := database.MustGetDB()
	return db.Model(&model.Texture{}).Where("id = ?", id).
		UpdateColumn("favorite_count", gorm.Expr("favorite_count - ?", 1)).Error
}

// CreateTextureDownloadLog 创建下载日志
func CreateTextureDownloadLog(log *model.TextureDownloadLog) error {
	db := database.MustGetDB()
	return db.Create(log).Error
}

// IsTextureFavorited 检查是否已收藏
func IsTextureFavorited(userID, textureID int64) (bool, error) {
	db := database.MustGetDB()
	var count int64
	err := db.Model(&model.UserTextureFavorite{}).
		Where("user_id = ? AND texture_id = ?", userID, textureID).
		Count(&count).Error
	if err != nil {
		return false, err
	}
	return count > 0, nil
}

// AddTextureFavorite 添加收藏
func AddTextureFavorite(userID, textureID int64) error {
	db := database.MustGetDB()
	favorite := &model.UserTextureFavorite{
		UserID:    userID,
		TextureID: textureID,
	}
	return db.Create(favorite).Error
}

// RemoveTextureFavorite 取消收藏
func RemoveTextureFavorite(userID, textureID int64) error {
	db := database.MustGetDB()
	return db.Where("user_id = ? AND texture_id = ?", userID, textureID).
		Delete(&model.UserTextureFavorite{}).Error
}

// GetUserTextureFavorites 获取用户收藏的材质列表
func GetUserTextureFavorites(userID int64, page, pageSize int) ([]*model.Texture, int64, error) {
	db := database.MustGetDB()
	var textures []*model.Texture
	var total int64

	// 子查询获取收藏的材质ID
	subQuery := db.Model(&model.UserTextureFavorite{}).
		Select("texture_id").
		Where("user_id = ?", userID)

	query := db.Model(&model.Texture{}).
		Where("id IN (?) AND status = 1", subQuery)

	// 获取总数
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}

	// 分页查询
	offset := (page - 1) * pageSize
	err := query.Preload("Uploader").
		Order("created_at DESC").
		Offset(offset).
		Limit(pageSize).
		Find(&textures).Error

	if err != nil {
		return nil, 0, err
	}

	return textures, total, nil
}

// CountTexturesByUploaderID 统计用户上传的材质数量
func CountTexturesByUploaderID(uploaderID int64) (int64, error) {
	db := database.MustGetDB()
	var count int64
	err := db.Model(&model.Texture{}).
		Where("uploader_id = ? AND status != -1", uploaderID).
		Count(&count).Error
	return count, err
}