syntax = "proto3";

package push;

option go_package = "github.com/localytics/push-notification-protos/push";

import "google/protobuf/struct.proto";

// ─── Alert ───────────────────────────────────────────
// Push notification content
message Alert {
  string body = 1;                  // required — the notification text
  optional string title = 2;       // optional — short title
  optional string subtitle = 3;    // optional — iOS 10+ only
}

// ─── Platform-Specific Parameters ────────────────────

// iOS push options
message IOSParams {
  optional string sound = 1;               // sound file name or "default"
  optional int32 badge = 2;                // unread badge number
  optional string category = 3;            // interactive push category
  optional bool content_available = 4;     // true by default
  optional bool mutable_content = 5;       // false by default
  google.protobuf.Struct extra = 6;        // arbitrary JSON object
}

// Android push options
message AndroidParams {
  optional string priority = 1;            // message priority
  google.protobuf.Struct extra = 2;        // arbitrary JSON object
}

// Web push options
message WebParams {
  optional string badge = 1;               // URL to image for app icon
  optional string dir = 2;                 // "ltr", "rtl", or "auto"
  optional string icon = 3;               // URL to thumbnail image
  optional bool require_interaction = 4;
  optional bool renotify = 5;
  optional bool silent = 6;
  optional string tag = 7;
  google.protobuf.Struct extra = 8;        // arbitrary JSON object
}

// ─── Labels ──────────────────────────────────────────
// Up to 10 labels for campaign performance tracking
message Labels {
  optional string label1 = 1;
  optional string label2 = 2;
  optional string label3 = 3;
  optional string label4 = 4;
  optional string label5 = 5;
  optional string label6 = 6;
  optional string label7 = 7;
  optional string label8 = 8;
  optional string label9 = 9;
  optional string label10 = 10;
}

// ─── Stream Initialization ───────────────────────────
// Sent once as the first message when the stream opens.
message StreamInit {
  string app_id = 1;                       // required — the app UUID
  optional string request_id = 2;          // optional, max 255 chars
  optional string campaign_key = 3;        // optional, max 255 chars
  optional Labels labels = 4;
  optional bool all_devices = 5;           // false by default
  optional bool test = 6;
}

// ─── Push Request ────────────────────────────────────
// One per streamed message. Each targets one or more customer_ids.
message PushRequest {
  repeated string customer_ids = 1;        // required, non-empty strings
  optional Alert alert = 2;               // required — rejected if missing
  optional IOSParams ios = 3;
  optional AndroidParams android = 4;
  optional WebParams web = 5;
}

// ─── Stream Message Wrapper ──────────────────────────
// First message MUST be init. All subsequent MUST be push.
message PushStreamMessage {
  oneof payload {
    StreamInit init = 1;
    PushRequest push = 2;
  }
}

// ─── Response ────────────────────────────────────────
message PushResponse {
  string request_id = 1;
  int32 total_messages = 2;
  int32 total_customer_ids = 3;
  string status = 4;                       // "accepted" or "error"
  optional string error = 5;
  int64 campaign_id = 6;
}

message PushFailure {
  repeated  string customer_ids = 1; // customer_ids that failed (subset of those in the request)
  string reason = 2;
}

message PushStreamResponse {
  oneof response {
    PushFailure failure = 1;
    PushResponse summary = 2;
  }
}

// ─── Service ─────────────────────────────────────────
service PushService {
  // Bidirectional: client sends StreamInit first, then PushRequests.
  // Server streams back PushFailure notifications for failed customer_ids. At the end, a push summary response is sent.
  rpc StreamPush(stream PushStreamMessage) returns (stream PushStreamResponse);
}