syntax = "proto3";

package memos.api.v1;

import "google/api/annotations.proto";
import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/api/httpbody.proto";
import "google/api/resource.proto";
import "google/protobuf/empty.proto";
import "google/protobuf/field_mask.proto";
import "google/protobuf/timestamp.proto";

option go_package = "gen/api/v1";

service AttachmentService {
  // CreateAttachment creates a new attachment.
  rpc CreateAttachment(CreateAttachmentRequest) returns (Attachment) {
    option (google.api.http) = {
      post: "/api/v1/attachments"
      body: "attachment"
    };
    option (google.api.method_signature) = "attachment";
  }
  // ListAttachments lists all attachments.
  rpc ListAttachments(ListAttachmentsRequest) returns (ListAttachmentsResponse) {
    option (google.api.http) = {get: "/api/v1/attachments"};
  }
  // GetAttachment returns a attachment by name.
  rpc GetAttachment(GetAttachmentRequest) returns (Attachment) {
    option (google.api.http) = {get: "/api/v1/{name=attachments/*}"};
    option (google.api.method_signature) = "name";
  }
  // GetAttachmentBinary returns a attachment binary by name.
  rpc GetAttachmentBinary(GetAttachmentBinaryRequest) returns (google.api.HttpBody) {
    option (google.api.http) = {get: "/file/{name=attachments/*}/{filename}"};
    option (google.api.method_signature) = "name,filename,thumbnail";
  }
  // UpdateAttachment updates a attachment.
  rpc UpdateAttachment(UpdateAttachmentRequest) returns (Attachment) {
    option (google.api.http) = {
      patch: "/api/v1/{attachment.name=attachments/*}"
      body: "attachment"
    };
    option (google.api.method_signature) = "attachment,update_mask";
  }
  // DeleteAttachment deletes a attachment by name.
  rpc DeleteAttachment(DeleteAttachmentRequest) returns (google.protobuf.Empty) {
    option (google.api.http) = {delete: "/api/v1/{name=attachments/*}"};
    option (google.api.method_signature) = "name";
  }
}

message Attachment {
  option (google.api.resource) = {
    type: "memos.api.v1/Attachment"
    pattern: "attachments/{attachment}"
    singular: "attachment"
    plural: "attachments"
  };

  // The name of the attachment.
  // Format: attachments/{attachment}
  string name = 1 [(google.api.field_behavior) = IDENTIFIER];

  // Output only. The creation timestamp.
  google.protobuf.Timestamp create_time = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The filename of the attachment.
  string filename = 3 [(google.api.field_behavior) = REQUIRED];

  // Input only. The content of the attachment.
  bytes content = 4 [(google.api.field_behavior) = INPUT_ONLY];

  // Optional. The external link of the attachment.
  string external_link = 5 [(google.api.field_behavior) = OPTIONAL];

  // The MIME type of the attachment.
  string type = 6 [(google.api.field_behavior) = REQUIRED];

  // Output only. The size of the attachment in bytes.
  int64 size = 7 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Optional. The related memo. Refer to `Memo.name`.
  // Format: memos/{memo}
  optional string memo = 8 [(google.api.field_behavior) = OPTIONAL];
}

message CreateAttachmentRequest {
  // Required. The attachment to create.
  Attachment attachment = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. The attachment ID to use for this attachment.
  // If empty, a unique ID will be generated.
  string attachment_id = 2 [(google.api.field_behavior) = OPTIONAL];
}

message ListAttachmentsRequest {
  // Optional. The maximum number of attachments to return.
  // The service may return fewer than this value.
  // If unspecified, at most 50 attachments will be returned.
  // The maximum value is 1000; values above 1000 will be coerced to 1000.
  int32 page_size = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A page token, received from a previous `ListAttachments` call.
  // Provide this to retrieve the subsequent page.
  string page_token = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Filter to apply to the list results.
  // Example: "type=image/png" or "filename:*.jpg"
  // Supported operators: =, !=, <, <=, >, >=, :
  // Supported fields: filename, type, size, create_time, memo
  string filter = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. The order to sort results by.
  // Example: "create_time desc" or "filename asc"
  string order_by = 4 [(google.api.field_behavior) = OPTIONAL];
}

message ListAttachmentsResponse {
  // The list of attachments.
  repeated Attachment attachments = 1;

  // A token that can be sent as `page_token` to retrieve the next page.
  // If this field is omitted, there are no subsequent pages.
  string next_page_token = 2;

  // The total count of attachments (may be approximate).
  int32 total_size = 3;
}

message GetAttachmentRequest {
  // Required. The attachment name of the attachment to retrieve.
  // Format: attachments/{attachment}
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {type: "memos.api.v1/Attachment"}
  ];
}

message GetAttachmentBinaryRequest {
  // Required. The attachment name of the attachment.
  // Format: attachments/{attachment}
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {type: "memos.api.v1/Attachment"}
  ];

  // The filename of the attachment. Mainly used for downloading.
  string filename = 2 [(google.api.field_behavior) = REQUIRED];

  // Optional. A flag indicating if the thumbnail version of the attachment should be returned.
  bool thumbnail = 3 [(google.api.field_behavior) = OPTIONAL];
}

message UpdateAttachmentRequest {
  // Required. The attachment which replaces the attachment on the server.
  Attachment attachment = 1 [(google.api.field_behavior) = REQUIRED];

  // Required. The list of fields to update.
  google.protobuf.FieldMask update_mask = 2 [(google.api.field_behavior) = REQUIRED];
}

message DeleteAttachmentRequest {
  // Required. The attachment name of the attachment to delete.
  // Format: attachments/{attachment}
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {type: "memos.api.v1/Attachment"}
  ];
}