syntax = "proto3";

package gallery;

option go_package = "./gallery";

service Gallery {
  // 健康检查
  rpc Ping(PingRequest) returns (PingResponse);

  // 图片元数据操作
  rpc GetImageList(ImageListRequest) returns (ImageListResponse);
  rpc GetImageDetail(ImageDetailRequest) returns (ImageDetailResponse);
  rpc UpdateImage(UpdateImageRequest) returns (UpdateImageResponse);
  rpc DeleteImage(DeleteImageRequest) returns (DeleteImageResponse);

  // 图片上传
  rpc UploadImage(UploadImageRequest) returns (UploadImageResponse);

  // 分类管理
  rpc GetCategoryTree(CategoryTreeRequest) returns (CategoryTreeResponse);
  rpc CreateCategory(CreateCategoryRequest) returns (CreateCategoryResponse);

  // 访问控制
  rpc GenerateUrl(GenerateUrlRequest) returns (GenerateUrlResponse);
}

// 健康检查
message PingRequest { string ping = 1; }
message PingResponse { string pong = 1; }

// 图片元数据
message ImageMeta {
  string image_id = 1;
  string title = 2;
  string description = 3;
  string category_id = 4;
  repeated string tags = 5;
  int64 file_size = 6;
  int32 width = 7;
  int32 height = 8;
  string storage_key = 9;
  string file_name = 10;
  string mime_type = 11;
  int64 created_at = 12;
  int64 updated_at = 13;
}

// 图片列表
message ImageListRequest {
  int32 page = 1;
  int32 page_size = 2;
  string category_id = 3;
  repeated string tags = 4;
  string order_by = 5; // created_at_desc | updated_at_asc
}

message ImageListResponse {
  repeated ImageMeta images = 1;
  int32 total = 2;
}

// 图片详情
message ImageDetailRequest { string image_id = 1; }
message ImageDetailResponse { ImageMeta meta = 1; }

// 更新图片
message UpdateImageRequest {
  string image_id = 1;
  optional string title = 2;
  optional string description = 3;
  optional string category_id = 4;
  repeated string tags = 5; // 全量替换
}

message UpdateImageResponse { bool success = 1; }

// 删除图片
message DeleteImageRequest {
  string image_id = 1;
  bool permanent = 2;
}

message DeleteImageResponse { bool success = 1; }

// 图片上传
message UploadImageRequest {
  bytes file_content = 1;
  string file_name = 2;
  optional string title = 3;
  optional string description = 4;
  optional string category_id = 5;
  repeated string tags = 6;
}

message UploadImageResponse {
  ImageMeta image_meta = 1;
  string preview_url = 2;
}

// 分类管理
message CategoryNode {
  string category_id = 1;
  string name = 2;
  repeated CategoryNode children = 3;
}

message CategoryTreeRequest { bool include_count = 1; }
message CategoryTreeResponse { repeated CategoryNode categories = 1; }

message CreateCategoryRequest {
  string name = 1;
  string parent_id = 2;
}

message CreateCategoryResponse { string category_id = 1; }

// URL生成
message GenerateUrlRequest {
  string image_id = 1;
  optional int32 width = 2;
  optional int32 height = 3;
  optional string format = 4;  // webp/jpg/png
  optional int32 quality = 5;  // 1-100
  int32 expires = 6;           // 有效期（秒）
}

message GenerateUrlResponse {
  string signed_url = 1;
  int64 expires_at = 2;  // Unix时间戳
}