/// <summary>
/// Signals the <see cref="Robot"/> to start moving.
/// </summary>
/// <param name="grid">The <see cref="IGrid"/> to traverse.</param>
public void Traverse(IGrid grid)
{
Contract.Requires(grid != null);
Contract.Ensures(this.FinishPosition != null);
foreach (var instruction in this.instructions)
{
var newPosition = instruction.TransformPosition(this.currentPosition);
var moveResult = grid.Move(this.currentPosition, newPosition);
if (moveResult == RobotFeedback.Lost)
{
this.FinishPosition = this.currentPosition;
this.Lost = true;
return;
}
else if (moveResult == RobotFeedback.Safe)
{
this.currentPosition = newPosition;
}
}
this.FinishPosition = this.currentPosition;
}