private void CreateLawnmowerMovementStratergy(LawnMowerModel lawnmower)
{
LawnmowerMovementStratergy = new Dictionary <Directions, Action>();
LawnmowerMovementStratergy.Add(Directions.North, () => { lawnmower.Position.Longitude += 1; });
LawnmowerMovementStratergy.Add(Directions.West, () => { lawnmower.Position.Latitude -= 1; });
LawnmowerMovementStratergy.Add(Directions.South, () => { lawnmower.Position.Longitude -= 1; });
LawnmowerMovementStratergy.Add(Directions.East, () => { lawnmower.Position.Latitude += 1; });
}
public GeoCoordinate ExecuteInstructions(LawnMowerModel lawnmower)
{
foreach (var movement in lawnmower.Instructions)
{
ExecuteInstruction(lawnmower, movement);
}
return(lawnmower.Position);
}
public void Ensure_Lawnmower_ChangeDirection_R_Returns_West_For_Current_Direction_South()
{
var lawnMower = new LawnMowerModel()
{
Position = new GeoCoordinate(1, 2),
Direction = Directions.South
};
lawnMower.Direction = new LawnmowerInstructions().ChangeDirection("R", lawnMower.Direction);
Assert.AreEqual(lawnMower.Direction, Directions.West);
}
public void Ensure_Lawnmower_ChangeDirection_L_Returns_North_For_Current_Direction_East()
{
var lawnMower = new LawnMowerModel()
{
Position = new GeoCoordinate(1, 2),
Direction = Directions.East
};
lawnMower.Direction = new LawnmowerInstructions().ChangeDirection("L", lawnMower.Direction);
Assert.AreEqual(lawnMower.Direction, Directions.North);
}
public void Ensure_Latitude_Decrements_By_One_When_Moving_West()
{
var latitude = 5;
var lawnMower = new LawnMowerModel()
{
Direction = Directions.West,
Position = new GeoCoordinate(latitude, 5)
};
lawnMower = new LawnmowerInstructions().MoveForward(lawnMower);
Assert.AreEqual(lawnMower.Position.Latitude, latitude -= 1);
}
public void Ensure_Longitude_Decrements_By_One_When_Moving_South()
{
var longitude = 5;
var lawnMower = new LawnMowerModel()
{
Direction = Directions.South,
Position = new GeoCoordinate(2, longitude)
};
lawnMower = new LawnmowerInstructions().MoveForward(lawnMower);
Assert.AreEqual(lawnMower.Position.Longitude, longitude -= 1);
}
public LawnMowerModel MoveForward(LawnMowerModel lawnmower)
{
CreateLawnmowerMovementStratergy(lawnmower);
var action = LawnmowerMovementStratergy.ContainsKey(lawnmower.Direction) ? LawnmowerMovementStratergy[lawnmower.Direction] : null;
if (action != null)
{
action.Invoke();
}
return(lawnmower);
}
public void AddLawnmowerToGrid(string lawnMowerPosition, string lawnmowerMovements)
{
//TODO: validate input.for both arguments.
var positions = lawnMowerPosition.Split(' ');
var latitude = int.Parse(positions[0]); //Fragile with more time would do differently
var longitude = int.Parse(positions[1]); //Fragile with more time would do differently
var direction = positions[2]; //Fragile with more time would do differently
var lawnmower = new LawnMowerModel()
{
Position = new GeoCoordinate(latitude, longitude),
Direction = GetDirection(direction),
Instructions = lawnmowerMovements.ToCharArray()
};
lawnmowers.Add(lawnmower);
}
private void ExecuteInstruction(LawnMowerModel lawnmower, char movement)
{
//TODO: given more time I would have done this differently.
switch (movement)
{
case 'L':
{
lawnmower.Direction = ChangeDirection("L", lawnmower.Direction);
break;
}
case 'R':
{
lawnmower.Direction = ChangeDirection("R", lawnmower.Direction);
break;
}
default:
{
MoveForward(lawnmower);
break;
}
}
}
