feat: Add low resolution character retrieval functionality

server/api/resource.go

@@ -339,6 +339,51 @@ func handleUpdateCharacterImage(c fiber.Ctx) error {
 	})
 }
 
+func handleGetLowResolutionCharacters(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")
+	}
+
+	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")
+	}
+
+	characters, totalPages, err := service.GetLowResolutionCharacters(page, maxWidth, maxHeight)
+	if err != nil {
+		return err
+	}
+
+	if characters == nil {
+		characters = []model.LowResCharacterView{}
+	}
+
+	return c.Status(fiber.StatusOK).JSON(model.PageResponse[model.LowResCharacterView]{
+		Success:    true,
+		Data:       characters,
+		TotalPages: totalPages,
+		Message:    "Low resolution characters retrieved successfully",
+	})
+}
+
 func AddResourceRoutes(api fiber.Router) {
 	resource := api.Group("/resource")
 	{
@@ -348,6 +393,7 @@ func AddResourceRoutes(api fiber.Router) {
 		resource.Get("/random", handleGetRandomResource)
 		resource.Get("/pinned", handleGetPinnedResources)
 		resource.Get("/vndb/characters", handleGetCharactersFromVndb)
+		resource.Get("/characters/low-resolution", handleGetLowResolutionCharacters)
 		resource.Get("/:id", handleGetResource)
 		resource.Delete("/:id", handleDeleteResource)
 		resource.Get("/tag/:tag", handleListResourcesWithTag)

server/dao/resource.go

@@ -544,3 +544,52 @@ func UpdateCharacterImage(characterID, imageID uint) error {
 	}
 	return nil
 }
+
+// GetLowResolutionCharacters 获取低清晰度的角色图片
+// maxWidth和maxHeight定义了低清晰度的阈值
+func GetLowResolutionCharacters(maxWidth, maxHeight int, limit int, offset int) ([]model.LowResCharacterView, error) {
+	var results []model.LowResCharacterView
+
+	query := `
+		SELECT 
+			c.id as character_id,
+			c.resource_id as resource_id,
+			c.name as name,
+			i.id as image_id,
+			i.width as image_width,
+			i.height as image_height
+		FROM characters c
+		INNER JOIN images i ON c.image_id = i.id
+		WHERE (i.width <= ? OR i.height <= ?)
+		AND c.image_id IS NOT NULL
+		ORDER BY c.id
+		LIMIT ? OFFSET ?
+	`
+
+	err := db.Raw(query, maxWidth, maxHeight, limit, offset).Scan(&results).Error
+	if err != nil {
+		return nil, err
+	}
+
+	return results, nil
+}
+
+// GetLowResolutionCharactersCount 获取低清晰度角色的总数
+func GetLowResolutionCharactersCount(maxWidth, maxHeight int) (int64, error) {
+	var count int64
+
+	query := `
+		SELECT COUNT(*)
+		FROM characters c
+		INNER JOIN images i ON c.image_id = i.id
+		WHERE (i.width <= ? OR i.height <= ?)
+		AND c.image_id IS NOT NULL
+	`
+
+	err := db.Raw(query, maxWidth, maxHeight).Scan(&count).Error
+	if err != nil {
+		return 0, err
+	}
+
+	return count, nil
+}

server/model/character.go

@@ -20,6 +20,15 @@ type CharacterView struct {
 	Image uint     `json:"image"`
 }
 
+type LowResCharacterView struct {
+	CharacterID uint   `json:"character_id"`
+	ResourceID  uint   `json:"resource_id"`
+	Name        string `json:"name"`
+	ImageID     uint   `json:"image_id"`
+	ImageWidth  int    `json:"image_width"`
+	ImageHeight int    `json:"image_height"`
+}
+
 func (c *Character) ToView() *CharacterView {
 	var imageID uint
 	if c.ImageID != nil {

server/service/resource.go

@@ -801,3 +801,30 @@ func UpdateCharacterImage(uid, resourceID, characterID, imageID uint) error {
 
 	return nil
 }
+
+// GetLowResolutionCharacters 获取低清晰度的角色图片
+func GetLowResolutionCharacters(page int, maxWidth, maxHeight int) ([]model.LowResCharacterView, int, error) {
+	const pageSize = 50 // 每页50个角色
+
+	if page <= 0 {
+		page = 1
+	}
+
+	offset := (page - 1) * pageSize
+
+	// 获取角色列表
+	characters, err := dao.GetLowResolutionCharacters(maxWidth, maxHeight, pageSize, offset)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	// 获取总数
+	totalCount, err := dao.GetLowResolutionCharactersCount(maxWidth, maxHeight)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	totalPages := int((totalCount + int64(pageSize) - 1) / int64(pageSize))
+
+	return characters, totalPages, nil
+}