static void Main(string[] args)
{
/*******************************************************************************************
* There could have been several approaches to this problem
* 1)Taking this as directed graph.
*
* 2)Making a global time controller which could raise ticks and synchronise all objects
* like traffic lights, driver's action based on every tick.But this approach is more suitable
* in case of simulations when there are several objecs etc.
*
*
* 3)So, I have taken the third approach as per problem scope and to maintain simplicity.
*
* The following assumptions have been made :
* All units are same..like time in minutes, secs or hrs
* Traffic light will assume the next light if the previous light duration is just over.
* i.e during the transition of lights old to new ...new light will be assumed to operate.
*
* Car is in "Start" state and at the start of journey and lights are green
*
* Basic design is :
*
* Route is composed of places which could be stretch or traffic light
* Driver will select driving strategy based on place
* Traffic light will give the waiting time based on elapsed time ..time passed since start of journey.
*
*
*
* Test cases have assumed same time unit..for all entities
* * *******************************************************************************************/
//Please take all values in same unit preferably minute
//sample input
ICar car = new Car(10/60.0);//10 secs
car.Start();
List<IPlace> orderedPlaces = new List<IPlace>();
orderedPlaces.Add(new RoadStretch(60/60.0, 150));// km/hr to km/minutes
orderedPlaces.Add(new TrafficLight(true, 1, 2));
orderedPlaces.Add(new RoadStretch(30/60.0, 120));
orderedPlaces.Add(new TrafficLight(true, 2, 2));
orderedPlaces.Add(new RoadStretch(50/60.0, 80));
Route route = new Route(orderedPlaces);
IDriver driver = new Driver();
Console.WriteLine(driver.Drive(car,route));//in minutes
car.Stop();
Console.ReadLine();
}
public void Drive()
{
Driver d = new Driver();
Car c = new Car(10);
//All green lights
List<IPlace> gPlaces = new List<IPlace>();
gPlaces.Add(new RoadStretch(50, 150));
gPlaces.Add(new TrafficLight(false, 2, 3));
gPlaces.Add(new RoadStretch(30, 120));
gPlaces.Add(new RoadStretch(30, 90));
gPlaces.Add(new TrafficLight(true, 2, 1));
gPlaces.Add(new RoadStretch(50, 150));
IRoute route = new Route(gPlaces);
double t = d.Drive(c, route);
Assert.AreEqual(13, t);
//All red lights
List<IPlace> rPlaces = new List<IPlace>();
rPlaces.Add(new RoadStretch(50, 150));
rPlaces.Add(new TrafficLight(false, 1, 2));
rPlaces.Add(new RoadStretch(30, 120));
rPlaces.Add(new RoadStretch(30, 90));
rPlaces.Add(new TrafficLight(true, 2, 2));
rPlaces.Add(new RoadStretch(50, 150));
route = new Route(rPlaces);
c.Reset();
t = d.Drive(c, route);
Assert.AreEqual(37, t);
//general case
List<IPlace> orderedPlaces = new List<IPlace>();
orderedPlaces.Add(new RoadStretch(50, 150));
route = new Route(orderedPlaces);
c.Reset();
t = d.Drive(c, route);
Assert.AreEqual(3, t);
orderedPlaces.Add(new RoadStretch(30, 120));
orderedPlaces.Add(new TrafficLight(true, 2, 2));
c.Reset();
t = d.Drive(c, route);
Assert.AreEqual(18, t, "result doesn't match");
orderedPlaces.Add(new RoadStretch(50, 150));
orderedPlaces.Add(new TrafficLight(true, 1, 2));
c.Reset();
t = d.Drive(c, route);
Assert.AreEqual(21, t);
//Thumb rule
//Total distance covered by car should be equal to the length of all stretches in the route
double totalDistance = c.GetMeterReading();
Assert.AreEqual(totalDistance,420);
c.Stop();
}
