require_relative './helper'

describe Terraformer::Coordinate do

  describe 'from' do
    it 'should accept nested arrays' do
      arys = [[100,0], [101,1], [102,2]]
      c = Terraformer::Coordinate.from arys

      c.class.must_equal Array
      c[0].class.must_equal Terraformer::Coordinate
      c[0].x.must_equal 100
      c[0].y.must_equal 0
      c[1].class.must_equal Terraformer::Coordinate
      c[1].x.must_equal 101
      c[1].y.must_equal 1
      c[2].class.must_equal Terraformer::Coordinate
      c[2].x.must_equal 102
      c[2].y.must_equal 2
    end

    it 'should accept double nested arrays' do
      arys = [[[100,0], [101,1]], [[102,2], [103,3]]]
      c = Terraformer::Coordinate.from arys

      c.class.must_equal Array
      c[0].class.must_equal Array
      c[0][0].class.must_equal Terraformer::Coordinate
      c[0][0].x.must_equal 100
      c[0][0].y.must_equal 0
    end
  end

  describe 'from_array' do

    it 'should be called from Array.to_c' do
      c = [100,0].to_c

      c.class.must_equal Terraformer::Coordinate
      c.x.must_equal 100
      c.y.must_equal 0
    end

    it 'should accept [100, 0]' do
      c = Terraformer::Coordinate.from_array [100, 0]

      c.class.must_equal Terraformer::Coordinate
      c.x.must_equal 100
      c.y.must_equal 0
    end

    it 'should accept nested arrays' do
      arys = [[100,0], [101,1], [102,2]]
      c = Terraformer::Coordinate.from_array arys

      c.class.must_equal Array
      c[0].class.must_equal Terraformer::Coordinate
      c[0].x.must_equal 100
      c[0].y.must_equal 0
      c[1].class.must_equal Terraformer::Coordinate
      c[1].x.must_equal 101
      c[1].y.must_equal 1
      c[2].class.must_equal Terraformer::Coordinate
      c[2].x.must_equal 102
      c[2].y.must_equal 2
    end

    it 'should accept double nested arrays' do
      arys = [[[100,0], [101,1]], [[102,2], [103,3]]]
      c = Terraformer::Coordinate.from_array arys

      c.class.must_equal Array
      c[0].class.must_equal Array
      c[0][0].class.must_equal Terraformer::Coordinate
      c[0][0].x.must_equal 100
      c[0][0].y.must_equal 0
    end

    it 'should accept triple nested arrays' do
      arys = [[[[100,0], [101,1]]]]
      c = Terraformer::Coordinate.from_array arys

      c.class.must_equal Array
      c[0].class.must_equal Array
      c[0][0].class.must_equal Array
      c[0][0][0].class.must_equal Terraformer::Coordinate
      c[0][0][0].x.must_equal 100
      c[0][0][0].y.must_equal 0
    end
  end

  describe 'initialize' do

    it 'accepts numbers as params: x,y' do
      c = Terraformer::Coordinate.new 100, 0

      c.x.must_equal 100
      c.y.must_equal 0
      c.z.must_equal nil
      #c.to_s.must_equal '100,0'
    end

    it 'accepts numbers as params: x,y,z' do
      c = Terraformer::Coordinate.new 100, 0, 0

      c.x.must_equal 100
      c.y.must_equal 0
      c.z.must_equal 0
      #c.to_s.must_equal '100,0,0'
    end

    it 'accepts strings as params: x,y' do
      c = Terraformer::Coordinate.new '100', '0'

      c.x.must_equal 100
      c.y.must_equal 0
      c.z.must_equal nil
      #c.to_s.must_equal '100,0'
    end

    it 'accepts strings as params: x,y,z' do
      c = Terraformer::Coordinate.new '100', '0', '0'

      c.x.must_equal 100
      c.y.must_equal 0
      c.z.must_equal 0
      #c.to_s.must_equal '100,0,0'
    end
    it 'accepts an array as params: x,y' do
      c = Terraformer::Coordinate.new [100, 0]

      c.x.must_equal 100
      c.y.must_equal 0
      c.z.must_equal nil
      #c.to_s.must_equal '100,0'
    end

    it 'accepts an array as params: x,y,z' do
      c = Terraformer::Coordinate.new [100, 0, 0]

      c.x.must_equal 100
      c.y.must_equal 0
      c.z.must_equal 0
      #c.to_s.must_equal '100,0,0'
    end

    it 'does not allow mixed params' do
      assert_raises ArgumentError do
        Terraformer::Coordinate.new [100,0], 0
      end

      assert_raises ArgumentError do
        Terraformer::Coordinate.new 100
      end

      assert_raises ArgumentError do
        Terraformer::Coordinate.new {}
      end
    end

    it 'does not allow invalid types' do
      assert_raises ArgumentError do
        Terraformer::Coordinate.new :foo, :bar
      end
    end

  end

  describe 'methods' do
    before :each do
      @c = Terraformer::Coordinate.new 100, 0, 0
    end

    describe 'modification' do

      it 'should allow modification of x' do
        @c.x = 101
        @c.x.must_equal 101

        @c.x = '102'
        @c.x.must_equal 102

        assert_raises ArgumentError do
          @c.x = :foo
        end
      end

      it 'should allow modification of y' do
        @c.y = 101
        @c.y.must_equal 101

        @c.y = '102'
        @c.y.must_equal 102

        assert_raises ArgumentError do
          @c.y = :foo
        end
      end
    end

    describe 'equality' do

      it 'should be equal' do
        c2 = Terraformer::Coordinate.new 100, 0, 0
        @c.must_equal c2
      end

      it 'should not be equal' do
        c2 = Terraformer::Coordinate.new 101, 0, 0
        @c.wont_equal c2
      end
    end

    describe 'maths' do
      before :each do
        @c2 = Terraformer::Coordinate.new 102, 2
      end

      it 'should add' do
        @c = @c + [1, 1]

        @c.x.must_equal 101
        @c.y.must_equal 1
      end

      it 'should subtract' do
        @c = @c - [1, 1]

        @c.x.must_equal 99
        @c.y.must_equal -1
      end

      it 'should calculate euclidean distance' do
        ed = @c.euclidean_distance_to(@c2)
        ed.to_s('F').must_equal "2.82842712474619"
      end

      it 'should calculate squared euclidean distance' do
        ed = @c.squared_euclidean_distance_to(@c2)
        ed.to_s('F').must_equal "8.0"
      end

      it 'should calculate haversine distance' do
        ed = @c.haversine_distance_to(@c2)
        ed.to_s('F').must_equal "314475.2493440403"
      end

      it 'should calculate distance and bearing' do
        db = @c.distance_and_bearing_to(@c2)
        db.class.must_equal Hash

        db[:distance].to_s('F').must_equal "314037.6739419673"
        db[:bearing][:initial].to_s('F').must_equal "45.17484844056842"
        db[:bearing][:final].to_s('F').must_equal "45.20976211316248"

        d = @c.distance_to @c2
        d.must_equal db[:distance]

        ib = @c.initial_bearing_to @c2
        ib.must_equal db[:bearing][:initial]

        fb = @c.final_bearing_to @c2
        fb.must_equal db[:bearing][:final]

      end
    end
  end
end