class Sass::Script::Color

def div(other)
  if other.is_a?(Sass::Script::Number) || other.is_a?(Sass::Script::Color)
    piecewise(other, :/)
  else
    super
  end
end

def initialize(rgb)
  rgb = rgb.map {|c| c.to_i}
  raise Sass::SyntaxError.new("Color values must be between 0 and 255") if rgb.any? {|c| c < 0 || c > 255}
  super(rgb.freeze)
end

def minus(other)
  if other.is_a?(Sass::Script::Number) || other.is_a?(Sass::Script::Color)
    piecewise(other, :-)
  else
    super
  end
end

def mod(other)
  if other.is_a?(Sass::Script::Number) || other.is_a?(Sass::Script::Color)
    piecewise(other, :%)
  else
    raise NoMethodError.new(nil, :mod)
  end
end

def piecewise(other, operation)
  other_num = other.is_a? Number
  if other_num && !other.unitless?
    raise Sass::SyntaxError.new("Cannot add a number with units (#{other}) to a color (#{self}).") 
  end
  result = []
  for i in (0...3)
    res = rgb[i].send(operation, other_num ? other.value : other.rgb[i])
    result[i] = [ [res, 255].min, 0 ].max
  end
  with(:red => result[0], :green => result[1], :blue => result[2])
end

def plus(other)
  if other.is_a?(Sass::Script::Number) || other.is_a?(Sass::Script::Color)
    piecewise(other, :+)
  else
    super
  end
end

def rgb
  @value
end

def times(other)
  if other.is_a?(Sass::Script::Number) || other.is_a?(Sass::Script::Color)
    piecewise(other, :*)
  else
    raise NoMethodError.new(nil, :times)
  end
end

def to_s
  return HTML4_COLORS_REVERSE[rgb] if HTML4_COLORS_REVERSE[rgb]
  red, green, blue = rgb.map { |num| num.to_s(16).rjust(2, '0') }
  "##{red}#{green}#{blue}"
end

def value
  warn <<END
ECATION WARNING:
Sass::Script::Color #value attribute is deprecated and will be
ved in version 3.2. Use the #rgb attribute instead.
  rgb
end

def with(attrs)
  Color.new([
      attrs[:red] || rgb[0],
      attrs[:green] || rgb[1],
      attrs[:blue] || rgb[2],
    ])
end