feat: Add low resolution resource images retrieval and update functionality

server/api/resource.go

@@ -400,6 +400,108 @@ func handleGetLowResolutionCharacters(c fiber.Ctx) error {
 	})
 }
 
+func handleGetLowResolutionResourceImages(c fiber.Ctx) error {
+	pageStr := c.Query("page")
+	if pageStr == "" {
+		pageStr = "1"
+	}
+	page, err := strconv.Atoi(pageStr)
+	if err != nil {
+		return model.NewRequestError("Invalid page number")
+	}
+
+	// 支持自定义页面大小，默认50，最大1000
+	pageSizeStr := c.Query("page_size")
+	if pageSizeStr == "" {
+		pageSizeStr = "50"
+	}
+	pageSize, err := strconv.Atoi(pageSizeStr)
+	if err != nil {
+		return model.NewRequestError("Invalid page_size parameter")
+	}
+	if pageSize > 1000 {
+		pageSize = 1000 // 限制最大页面大小
+	}
+	if pageSize < 1 {
+		pageSize = 1
+	}
+
+	maxWidthStr := c.Query("max_width")
+	if maxWidthStr == "" {
+		maxWidthStr = "800" // 默认最大宽度800px
+	}
+	maxWidth, err := strconv.Atoi(maxWidthStr)
+	if err != nil {
+		return model.NewRequestError("Invalid max_width parameter")
+	}
+
+	maxHeightStr := c.Query("max_height")
+	if maxHeightStr == "" {
+		maxHeightStr = "800" // 默认最大高度800px
+	}
+	maxHeight, err := strconv.Atoi(maxHeightStr)
+	if err != nil {
+		return model.NewRequestError("Invalid max_height parameter")
+	}
+
+	images, totalPages, err := service.GetLowResolutionResourceImages(page, pageSize, maxWidth, maxHeight)
+	if err != nil {
+		return err
+	}
+
+	if images == nil {
+		images = []model.LowResResourceImageView{}
+	}
+
+	return c.Status(fiber.StatusOK).JSON(model.PageResponse[model.LowResResourceImageView]{
+		Success:    true,
+		Data:       images,
+		TotalPages: totalPages,
+		Message:    "Low resolution resource images retrieved successfully",
+	})
+}
+
+func handleUpdateResourceImage(c fiber.Ctx) error {
+	resourceIdStr := c.Params("resourceId")
+	oldImageIdStr := c.Params("oldImageId")
+	if resourceIdStr == "" || oldImageIdStr == "" {
+		return model.NewRequestError("Resource ID and Old Image ID are required")
+	}
+	resourceId, err := strconv.Atoi(resourceIdStr)
+	if err != nil {
+		return model.NewRequestError("Invalid resource ID")
+	}
+	oldImageId, err := strconv.Atoi(oldImageIdStr)
+	if err != nil {
+		return model.NewRequestError("Invalid old image ID")
+	}
+
+	var params struct {
+		NewImageID uint `json:"new_image_id"`
+	}
+	body := c.Body()
+	err = json.Unmarshal(body, &params)
+	if err != nil {
+		return model.NewRequestError("Invalid request body")
+	}
+
+	uid, ok := c.Locals("uid").(uint)
+	if !ok {
+		return model.NewUnAuthorizedError("You must be logged in to update a resource image")
+	}
+
+	err = service.UpdateResourceImage(uid, uint(resourceId), uint(oldImageId), params.NewImageID)
+	if err != nil {
+		return err
+	}
+
+	return c.Status(fiber.StatusOK).JSON(model.Response[any]{
+		Success: true,
+		Data:    nil,
+		Message: "Resource image updated successfully",
+	})
+}
+
 func AddResourceRoutes(api fiber.Router) {
 	resource := api.Group("/resource")
 	{
@@ -410,11 +512,13 @@ func AddResourceRoutes(api fiber.Router) {
 		resource.Get("/pinned", handleGetPinnedResources)
 		resource.Get("/vndb/characters", handleGetCharactersFromVndb)
 		resource.Get("/characters/low-resolution", handleGetLowResolutionCharacters)
+		resource.Get("/images/low-resolution", handleGetLowResolutionResourceImages)
 		resource.Get("/:id", handleGetResource)
 		resource.Delete("/:id", handleDeleteResource)
 		resource.Get("/tag/:tag", handleListResourcesWithTag)
 		resource.Get("/user/:username", handleGetResourcesWithUser)
 		resource.Post("/:id", handleUpdateResource)
 		resource.Put("/:resourceId/character/:characterId/image", handleUpdateCharacterImage)
+		resource.Put("/:resourceId/image/:oldImageId", handleUpdateResourceImage)
 	}
 }

server/dao/resource.go

@@ -2,6 +2,7 @@ package dao
 
 import (
 	"errors"
+	"fmt"
 	"math/rand"
 	"nysoure/server/model"
 	"sync"
@@ -593,3 +594,81 @@ func GetLowResolutionCharactersCount(maxWidth, maxHeight int) (int64, error) {
 
 	return count, nil
 }
+
+// GetLowResolutionResourceImages 获取低清晰度的资源图片
+// maxWidth和maxHeight定义了低清晰度的阈值
+func GetLowResolutionResourceImages(maxWidth, maxHeight int, limit int, offset int) ([]model.LowResResourceImageView, error) {
+	var results []model.LowResResourceImageView
+
+	query := `
+		SELECT DISTINCT
+			r.id as resource_id,
+			r.title as title,
+			i.id as image_id,
+			i.width as image_width,
+			i.height as image_height
+		FROM resources r
+		INNER JOIN resource_images ri ON r.id = ri.resource_id
+		INNER JOIN images i ON ri.image_id = i.id
+		WHERE (i.width <= ? OR i.height <= ?)
+		ORDER BY r.id, i.id
+		LIMIT ? OFFSET ?
+	`
+
+	err := db.Raw(query, maxWidth, maxHeight, limit, offset).Scan(&results).Error
+	if err != nil {
+		return nil, err
+	}
+
+	return results, nil
+}
+
+// GetLowResolutionResourceImagesCount 获取低清晰度资源图片的总数
+func GetLowResolutionResourceImagesCount(maxWidth, maxHeight int) (int64, error) {
+	var count int64
+
+	query := `
+		SELECT COUNT(DISTINCT ri.resource_id, ri.image_id)
+		FROM resources r
+		INNER JOIN resource_images ri ON r.id = ri.resource_id
+		INNER JOIN images i ON ri.image_id = i.id
+		WHERE (i.width <= ? OR i.height <= ?)
+	`
+
+	err := db.Raw(query, maxWidth, maxHeight).Scan(&count).Error
+	if err != nil {
+		return 0, err
+	}
+
+	return count, nil
+}
+
+// UpdateResourceImage 更新资源中特定的图片ID
+func UpdateResourceImage(resourceID, oldImageID, newImageID uint) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		// 首先检查关联是否存在
+		var exists bool
+		err := tx.Raw("SELECT EXISTS(SELECT 1 FROM resource_images WHERE resource_id = ? AND image_id = ?)",
+			resourceID, oldImageID).Scan(&exists).Error
+		if err != nil {
+			return err
+		}
+
+		if !exists {
+			return fmt.Errorf("resource %d does not have image %d", resourceID, oldImageID)
+		}
+
+		// 更新resource_images表中的image_id
+		result := tx.Exec("UPDATE resource_images SET image_id = ? WHERE resource_id = ? AND image_id = ?",
+			newImageID, resourceID, oldImageID)
+		if result.Error != nil {
+			return result.Error
+		}
+
+		if result.RowsAffected == 0 {
+			return fmt.Errorf("no resource image association updated")
+		}
+
+		return nil
+	})
+}

server/model/resource.go

@@ -60,6 +60,14 @@ type ResourceDetailView struct {
 	Characters        []CharacterView `json:"characters"`
 }
 
+type LowResResourceImageView struct {
+	ResourceID  uint   `json:"resource_id"`
+	Title       string `json:"title"`
+	ImageID     uint   `json:"image_id"`
+	ImageWidth  int    `json:"image_width"`
+	ImageHeight int    `json:"image_height"`
+}
+
 func (r *Resource) ToView() ResourceView {
 	tags := make([]TagView, len(r.Tags))
 	for i, tag := range r.Tags {

server/service/resource.go

@@ -832,3 +832,51 @@ func GetLowResolutionCharacters(page int, pageSize int, maxWidth, maxHeight int)
 
 	return characters, totalPages, nil
 }
+
+// GetLowResolutionResourceImages 获取低清晰度的资源图片
+func GetLowResolutionResourceImages(page int, pageSize int, maxWidth, maxHeight int) ([]model.LowResResourceImageView, int, error) {
+	if page <= 0 {
+		page = 1
+	}
+	if pageSize <= 0 {
+		pageSize = 50 // 默认每页50个图片
+	}
+	if pageSize > 1000 {
+		pageSize = 1000 // 限制最大页面大小
+	}
+
+	offset := (page - 1) * pageSize
+
+	// 获取资源图片列表
+	images, err := dao.GetLowResolutionResourceImages(maxWidth, maxHeight, pageSize, offset)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	// 获取总数
+	totalCount, err := dao.GetLowResolutionResourceImagesCount(maxWidth, maxHeight)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	totalPages := int((totalCount + int64(pageSize) - 1) / int64(pageSize))
+
+	return images, totalPages, nil
+}
+
+// UpdateResourceImage 更新资源图片
+func UpdateResourceImage(uid, resourceID, oldImageID, newImageID uint) error {
+	// 首先检查用户权限 - 确保用户是资源的所有者或管理员
+	resource, err := dao.GetResourceByID(resourceID)
+	if err != nil {
+		return err
+	}
+
+	if resource.UserID != uid {
+		// 可以在这里添加管理员权限检查
+		return model.NewUnAuthorizedError("You don't have permission to update this resource")
+	}
+
+	// 更新资源图片
+	return dao.UpdateResourceImage(resourceID, oldImageID, newImageID)
+}