syntax = "proto3";

package order;

service Order {
  rpc CreateOrder (OrderRequest) returns (OrderResponse);
  rpc GetOrder (OrderId) returns (OrderResponse);
  rpc ListOrders (ListOrdersRequest) returns (ListOrdersResponse);
  rpc UpdateOrder (OrderRequest) returns (OrderResponse);
  rpc DeleteOrder (OrderId) returns (DeleteOrderResponse);
  
  // Stream of order status updates
  rpc TrackOrderStatus (OrderId) returns (stream OrderStatusUpdate);
}

message OrderId {
  string id = 1;
}

message OrderItem {
  int32 product_id = 1;
  int32 quantity = 2;
  float unit_price = 3;
}

message OrderRequest {
  string id = 1;
  string user_id = 2;
  repeated OrderItem items = 3;
  string shipping_address = 4;
  float total_amount = 5;
  OrderStatus status = 6;
}

message OrderResponse {
  string id = 1;
  string user_id = 2;
  repeated OrderItem items = 3;
  string shipping_address = 4;
  float total_amount = 5;
  OrderStatus status = 6;
  string created_at = 7;
  string updated_at = 8;
}

enum OrderStatus {
  PENDING = 0;
  PROCESSING = 1;
  SHIPPED = 2;
  DELIVERED = 3;
  CANCELLED = 4;
}

message ListOrdersRequest {
  string user_id = 1;
  int32 page = 2;
  int32 limit = 3;
}

message ListOrdersResponse {
  repeated OrderResponse orders = 1;
  int32 total_count = 2;
}

message DeleteOrderResponse {
  bool success = 1;
  string message = 2;
}

message OrderStatusUpdate {
  string order_id = 1;
  OrderStatus status = 2;
  string timestamp = 3;
  string message = 4;
}