syntax = "proto3";

package chatto.api.v1;

import "buf/validate/validate.proto";
import "google/protobuf/descriptor.proto";

// Browser Web Push subscription commands for the current user.
service PushNotificationService {
  // Stores or updates the caller's browser push subscription.
  //
  // The server must have Web Push configured. Clients normally call this after
  // the browser grants notification permission and returns a PushSubscription.
  rpc Subscribe(SubscribePushRequest) returns (SubscribePushResponse);

  // Removes the caller's browser push subscription by endpoint.
  //
  // The call is idempotent: removing an unknown endpoint still succeeds.
  rpc Unsubscribe(UnsubscribePushRequest) returns (UnsubscribePushResponse) {
    option idempotency_level = IDEMPOTENT;
  }
}

// Request to store a PushSubscription returned by the browser Push API.
message SubscribePushRequest {
  // Push service endpoint URL.
  string endpoint = 1 [(buf.validate.field).string = {
    min_len: 1
    max_len: 4096
  }];

  // Client P-256 ECDH public key from PushSubscription.keys.p256dh.
  string p256dh = 2 [(buf.validate.field).string = {
    min_len: 1
    max_len: 256
  }];

  // Authentication secret from PushSubscription.keys.auth.
  string auth = 3 [(buf.validate.field).string = {
    min_len: 1
    max_len: 128
  }];

  // Optional browser user-agent string for device identification.
  optional string user_agent = 4 [(buf.validate.field).string.max_len = 512];
}

// Response from storing a browser push subscription.
message SubscribePushResponse {
  // True when the subscription was stored.
  bool subscribed = 1;
}

// Request to remove a browser push subscription.
message UnsubscribePushRequest {
  // Push service endpoint URL to remove.
  string endpoint = 1 [(buf.validate.field).string = {
    min_len: 1
    max_len: 4096
  }];
}

// Response from removing a browser push subscription.
message UnsubscribePushResponse {
  // True when the request completed.
  bool unsubscribed = 1;
}