syntax = "proto3";

package chatto.api.v1;

import "buf/validate/validate.proto";
import "chatto/api/v1/pagination.proto";
import "chatto/api/v1/rooms.proto";
import "chatto/api/v1/users.proto";
import "google/protobuf/timestamp.proto";

// Direct-message notification payload.
message DirectMessageNotification {
  reserved 1;
  reserved "room_id";

  // Message event ID.
  string event_id = 2;
  // DM room where the message was posted.
  RoomSummary room = 3;
}

// Mention notification payload.
message MentionNotification {
  // Room where the mention occurred.
  RoomSummary room = 1;
  // Message event ID.
  string event_id = 2;
  // Thread root event ID when the mention happened inside a thread.
  optional string thread_root_event_id = 3;
}

// Reply notification payload.
message ReplyNotification {
  // Room where the reply occurred.
  RoomSummary room = 1;
  // Reply event ID.
  string event_id = 2;
  // Event ID of the message being replied to.
  string in_reply_to_id = 3;
  // Thread root event ID when the reply happened inside a thread.
  optional string thread_root_event_id = 4;
}

// All-messages room notification payload.
message RoomMessageNotification {
  // Room where the message was posted.
  RoomSummary room = 1;
  // Message event ID.
  string event_id = 2;
}

// One pending notification for the authenticated viewer.
message NotificationItem {
  reserved 4;
  reserved "summary";

  // Stable notification ID.
  string id = 1;
  // Creation time.
  google.protobuf.Timestamp created_at = 2;
  // User who triggered the notification, when still resolvable.
  User actor = 3;

  oneof kind {
    // Direct-message notification.
    DirectMessageNotification direct_message = 10;
    // Mention notification.
    MentionNotification mention = 11;
    // Reply notification.
    ReplyNotification reply = 12;
    // All-messages room notification.
    RoomMessageNotification room_message = 13;
  }
}

// Request for the authenticated viewer's pending notifications.
message ListNotificationsRequest {
  reserved 1, 2;
  reserved "limit", "offset";

  // Page request. Defaults to 50 results when absent or limit is zero.
  PageRequest page = 3;
}

// Request for pending notifications scoped to one room.
message ListRoomNotificationsRequest {
  reserved 2, 3;
  reserved "limit", "offset";

  // Required. Room whose notifications should be listed.
  string room_id = 1 [(buf.validate.field).string.min_len = 1];
  // Page request. Defaults to 50 results when absent or limit is zero.
  PageRequest page = 4;
}

// Pending notification page.
message ListNotificationsResponse {
  reserved 2, 3, 4;
  reserved "total_count", "has_more", "server_name";

  // Page notifications, newest first.
  repeated NotificationItem notifications = 1;
  // Page metadata.
  PageInfo page = 5;
}

// Request one pending notification for the authenticated viewer.
message GetNotificationRequest {
  // Required notification ID.
  string notification_id = 1 [(buf.validate.field).string.min_len = 1];
}

// Pending notification response.
message GetNotificationResponse {
  reserved 2;
  reserved "server_name";

  // Requested notification.
  NotificationItem notification = 1;
}

// Request pending notifications for a set of stable notification IDs.
message BatchGetNotificationsRequest {
  // Required notification IDs. Unknown or dismissed IDs are omitted from the
  // response.
  repeated string notification_ids = 1 [(buf.validate.field).repeated = {
    min_items: 1
    max_items: 100
    items: {
      string: {min_len: 1}
    }
  }];
}

// Batch pending notification response.
message BatchGetNotificationsResponse {
  reserved 2;
  reserved "server_name";

  // Found notifications. The server preserves first-seen request order and
  // de-duplicates repeated IDs.
  repeated NotificationItem notifications = 1;
}

// Pending notification page scoped to one room.
message ListRoomNotificationsResponse {
  reserved 2, 3, 4;
  reserved "total_count", "has_more", "server_name";

  // Page notifications, newest first.
  repeated NotificationItem notifications = 1;
  // Page metadata.
  PageInfo page = 5;
}

// Request for a lightweight pending notification check.
message HasNotificationsRequest {}

// Lightweight pending notification check.
message HasNotificationsResponse {
  // True when the authenticated viewer has at least one pending notification.
  bool has_notifications = 1;
}

// Pending notification count for one room.
message RoomNotificationCount {
  // Room ID.
  string room_id = 1;
  // Pending notification count for the authenticated viewer in this room.
  int32 total_count = 2;
}

// Request for pending notification counts grouped by room.
message ListRoomNotificationCountsRequest {}

// Finite snapshot of pending notification counts grouped by room.
message ListRoomNotificationCountsResponse {
  // Counts for rooms with at least one pending notification.
  repeated RoomNotificationCount room_counts = 1;
}

// Request to dismiss one pending notification.
message DismissNotificationRequest {
  // Required. Notification to dismiss.
  string notification_id = 1 [(buf.validate.field).string.min_len = 1];
}

// Result of dismissing one pending notification.
message DismissNotificationResponse {
  // True when the notification is no longer pending.
  bool dismissed = 1;
}

// Request to dismiss all pending notifications.
message DismissAllNotificationsRequest {}

// Result of dismissing all pending notifications.
message DismissAllNotificationsResponse {
  // Number of notifications dismissed.
  int32 dismissed_count = 1;
}

// Reads and dismisses pending notifications for the authenticated viewer.
service NotificationService {
  // Lists the authenticated viewer's pending notifications.
  rpc ListNotifications(ListNotificationsRequest) returns (ListNotificationsResponse);
  // Gets one pending notification. Returns NOT_FOUND when the notification is
  // unknown or has been dismissed.
  rpc GetNotification(GetNotificationRequest) returns (GetNotificationResponse);
  // Gets pending notifications by ID.
  rpc BatchGetNotifications(BatchGetNotificationsRequest) returns (BatchGetNotificationsResponse);
  // Lists pending notifications for one room. Non-members receive an empty page.
  rpc ListRoomNotifications(ListRoomNotificationsRequest) returns (ListRoomNotificationsResponse);
  // Lists pending notification counts grouped by room as a finite snapshot.
  rpc ListRoomNotificationCounts(ListRoomNotificationCountsRequest) returns (ListRoomNotificationCountsResponse);
  // Checks whether the authenticated viewer has any pending notifications.
  rpc HasNotifications(HasNotificationsRequest) returns (HasNotificationsResponse);
  // Dismisses one pending notification. Already-dismissed notifications are
  // treated as idempotent success.
  rpc DismissNotification(DismissNotificationRequest) returns (DismissNotificationResponse);
  // Dismisses all pending notifications.
  rpc DismissAllNotifications(DismissAllNotificationsRequest) returns (DismissAllNotificationsResponse);
}