syntax = "proto3";

package routing;
option go_package = "./proto;routing";

service Routing {
	// Route returns a gps route from origin to destination based on lat/lng
	rpc Route(RouteRequest) returns (RouteResponse) {}
	// Eta returns an estimated time of arrival for a route
	rpc Eta(EtaRequest) returns (EtaResponse) {}
	// Directions provides turn by turn directions
	rpc Directions(DirectionsRequest) returns (DirectionsResponse) {}
}

message Point {
	// Lat e.g 52.523219
	double latitude = 1;
	// Long e.g 13.428555
	double longitude = 2;
}

message Waypoint {
	// street name or related reference
	string name = 1;
	// gps point coordinates
	Point location = 2;
}

message Maneuver {
	double bearing_before = 1;
	double bearing_after = 2;
	Point location = 3;
	string action = 4;
	string direction = 5;
}

message Intersection {
	Point location = 1;
	repeated double bearings = 2;
}

message Direction {
	// street name or location
	string name = 1;
	// alternative reference
	string reference = 2;
	// human readable instruction
	string instruction = 3;
	// distance to travel in meters
	double distance = 4;
	// duration to travel in seconds
	double duration = 5;
	// maneuver to take
	Maneuver maneuver = 6;
	// intersections on route
	repeated Intersection intersections = 7;
}

// Turn by turn directions from a start point to an end point including maneuvers and bearings
message DirectionsRequest {
	// The staring point for the journey
	Point origin = 1;
	// The destination of the journey
	Point destination = 2;
}

message DirectionsResponse {
	// Turn by turn directions
	repeated Direction directions = 1;
	// The waypoints on the route
	repeated Waypoint waypoints = 2;
	// Estimated distance of the route in meters
	double distance = 3;
	// Estimated duration of the route in seconds
	double duration = 4;
}

// Get the eta for a route from origin to destination. The eta is an estimated time based on car routes
message EtaRequest {
	// The starting point for the eta calculation
	Point origin = 1;
	// The end point for the eta calculation
	Point destination = 2;
	// type of transport. Only "car" is supported currently.
	string type = 3;
	// speed in kilometers
	double speed = 4;
}

message EtaResponse {
	// eta in seconds
	double duration = 1;
}

// Retrieve a route as a simple list of gps points along with total distance and estimated duration
message RouteRequest {
	// Point of origin for the trip
	Point origin = 1;
	// Point of destination for the trip
	Point destination = 2;
}

message RouteResponse {
	// estimated distance in meters
	double distance = 1;
	// estimated duration in seconds
	double duration = 2;
	// waypoints on the route
	repeated Waypoint waypoints = 3;
}