syntax = "proto3";

package etas;
option go_package = "proto;etas";

import "google/protobuf/timestamp.proto";

service ETAs {
	rpc Calculate(Route) returns (Response);
}

message Point {
	// id for the point, this is returned in the response with additional information such as estimated
	// arrival time and estimated departure time.
	string id = 1;
	// the latitude for the point
	double latitude = 2;
	// the longitude for the point
	double longitude = 3;
	// the estimated time the vehicle will spend at the point between arrival and departure (unit 
	// minutes).
	int32 wait_time = 4;
}

message Route {
	// pickup is where the route must start, e.g. a depot
	Point pickup = 1;
	// waypoints are points the vehicle must pass on their route
	repeated Point waypoints = 2;
	// start time specifies the time the vehicle will arrive at the pickup. If no value is provided,
	// the current time will be used
	google.protobuf.Timestamp start_time = 3;
}

message Response {
	// points contains the ETAs for each point. The first point will be the pickup and the subsequent
	// points are the waypoints
	map<string,ETA> points = 1;
}

message ETA {
	google.protobuf.Timestamp estimated_arrival_time = 1;
	google.protobuf.Timestamp estimated_departure_time = 2;
}