$: << File.expand_path(File.join(File.dirname(__FILE__), '../lib'))
require 'rubygems'
require 'gosu'

include Gosu

describe Color do
  it "should accept 1, 3, or 4 parameters in the constructor" do
    lambda {Color.new 0}.should_not raise_error
    lambda {Color.new 0, 0}.should raise_error(ArgumentError)
    lambda {Color.new 0, 0, 0}.should_not raise_error
    lambda {Color.new 0, 0, 0, 0}.should_not raise_error
  end

  it "should parse 0xaarrggbb in the 1-argument constructor" do
    color = Color.new(0xff223344)
    color.alpha.should == 0xff
    color.red.should == 0x22
    color.green.should == 0x33
    color.blue.should == 0x44
  end

  it "should have the correct HSV values when constructed from RGB values" do
    color = Color.new(95, 127, 63)
    color.hue.should be_close(90.0, 0.005)
    color.saturation.should be_close(0.5, 0.005)
    color.value.should be_close(0.5, 0.005)
  end

  it "should have working getters and setters" do
    color = Color.new(0)
    color.red = 11
    color.red.should == 11
    color.green = 22
    color.green.should == 22
    color.blue = 33
    color.blue.should == 33
    color.alpha = 44
    color.alpha.should == 44

    color.hue = 180
    color.hue.should be_close(180.0, 0.005)
    color.red.should be_close(10, 2)
    color.green.should == 33
    color.blue.should == 33

    color.saturation = 0.5
    color.saturation.should be_close(0.5, 0.02)
    color.red.should be_close(16, 2)

    color.value = 0.5
    color.value.should be_close(0.5, 0.005)
    color.red.should be_close(61, 6)
    color.green.should be_close(127, 2)
    color.blue.should be_close(127, 2)
  end

  it "should have static from_hsv and from_ahsv methods that return a color from HSV values" do
    lambda {Color.from_hsv 0, 0, 0, 0}.should raise_error(ArgumentError)
    lambda {Color.from_hsv 0, 0}.should raise_error(ArgumentError)
    lambda {Color.from_ahsv 0, 0, 0, 0, 0}.should raise_error(ArgumentError)
    lambda {Color.from_ahsv 0, 0, 0}.should raise_error(ArgumentError)
    c = Color.from_hsv 0.5, 0.5, 0.5
    c.alpha.should == 255
    c.red.should be_close(127, 2)
    c.green.should be_close(64, 2)
    c.blue.should be_close(63, 2)

    c = Color.from_ahsv 100, 0.5, 0.5, 0.5
    c.alpha.should == 100
    c.red.should be_close(127, 2)
    c.green.should be_close(64, 2)
    c.blue.should be_close(63, 2)
  end
end