require 'rover'
require 'north'
require 'east'
require 'west'
require 'south'

describe Rover do
  def create_sut(heading, x = 0, y = 0)
    directions = {:north => North.new, :east => East.new, :west => West.new, :south => South.new}
    Rover.new directions[heading],{ :x =>x,:y => y }
  end

  describe "when facing north" do
    before do
      @sut = create_sut :north, 0, 0
    end
    describe "when turning right" do
      it "should face east" do
        @sut.turn_right
        @sut.heading.must_equal :east
      end
    end
    describe "when turning left" do
      it "should face west" do
        @sut.turn_left
        @sut.heading.must_equal :west
      end
    end
  end

  describe "when facing south" do
    before do
      @sut = create_sut :south, 0, 3
    end
    describe "when turning right" do
      it "should face west" do
        @sut.turn_right
        @sut.heading.must_equal :west
      end
    end
    describe "when turning left" do
      it "should face east" do
        @sut.turn_left
        @sut.heading.must_equal :east
      end
    end
  end

  describe "when facing east" do
    before do
      @sut = create_sut :east
    end
    describe "when turning right" do
      it "should face south" do
        @sut.turn_right
        @sut.heading.must_equal :south
      end
    end
    describe "when turning left" do
      it "should face north" do
        @sut.turn_left
        @sut.heading.must_equal :north
      end
    end
  end

  describe "when facing west" do
    before do
      @sut = create_sut :west, 1, 0
    end
    describe "when turning right" do
      it "should face north" do
        @sut.turn_right
        @sut.heading.must_equal :north
      end
    end
    describe "when turning left" do
      it "should face south" do
        @sut.turn_left
        @sut.heading.must_equal :south
      end
    end
  end

  describe "when driving forward" do
    it "should move forward along the terrain" do
      @terrain.received(:move_forward).called_with(@sut.instance_variable_get(:@heading), @sut.location).wont_be_nil
    end
    before do
      @terrain = fake
      @sut = create_sut(:north)
      @sut.move_forward(@terrain)
    end
  end
end