# frozen_string_literal: true

require 'test_helper'

module Vedeu

  module Colours

    describe Translator do

      let(:described) { Vedeu::Colours::Translator }
      let(:instance)  { described.new(colour) }
      let(:colour)    { '#ff0000' }

      describe '#initialize' do
        it { instance.must_be_instance_of(described) }
        it { instance.instance_variable_get('@colour').must_equal(colour) }
      end

      describe '#colour' do
        it { instance.must_respond_to(:colour) }
      end

      describe '#value' do
        it { instance.must_respond_to(:value) }
      end

      describe '.coerce' do
        let(:_value) {}

        subject { described.coerce(_value) }

        context 'when the value is nil' do
          it { subject.must_be_instance_of(described) }

          it do
            Vedeu::Colours::Background.coerce(_value).
              must_be_instance_of(Vedeu::Colours::Background)
          end
          it { Vedeu::Colours::Background.coerce(_value).colour.must_equal('') }
          it do
            Vedeu::Colours::Foreground.coerce(_value).
              must_be_instance_of(Vedeu::Colours::Foreground)
          end
          it { Vedeu::Colours::Foreground.coerce(_value).colour.must_equal('') }
        end

        context 'when the value is a Vedeu::Colours::Background' do
          let(:_value) { Vedeu::Colours::Background.new }

          it { subject.must_equal(_value) }
        end

        context 'when the value is a Vedeu::Colours::Foreground' do
          let(:_value) { Vedeu::Colours::Foreground.new }

          it { subject.must_equal(_value) }
        end

        context 'when the value is not a polymorphic Colour' do
          let(:_value) { '#aadd00' }

          it { subject.must_be_instance_of(described) }
        end
      end

      describe '#empty?' do
        subject { instance.empty? }

        context 'when there is no colour' do
          let(:colour) {}

          it { subject.must_equal(true) }
        end

        context 'when there is a colour' do
          it { subject.must_equal(false) }
        end
      end

      describe '#eql?' do
        let(:other) { instance }

        subject { instance.eql?(other) }

        it { subject.must_equal(true) }

        context 'when different to other' do
          let(:other) { described.new('#ff00ff') }

          it { subject.must_equal(false) }
        end
      end

      describe '#==' do
        it { instance.must_respond_to(:==) }
      end

      describe '#escape_sequence' do
        subject { instance.escape_sequence }

        context 'when no colour is given' do
          let(:colour) {}

          it { subject.must_equal('') }
        end

        context 'when the colour is a terminal named colour; e.g. :red' do
          let(:colour) { :red }

          it 'raises an exception since the subclasses Background and ' \
             'Foreground handle this' do
            proc { subject }.must_raise(Vedeu::Error::NotImplemented)
          end
        end

        context 'when the colour is a terminal numbered colour; e.g. 122' do
          let(:colour) { 122 }

          it 'raises an exception since the subclasses Background and ' \
             'Foreground handle this' do
            proc { subject }.must_raise(Vedeu::Error::NotImplemented)
          end
        end

        context 'when the colour is a HTML/CSS colour (RGB specified)' do
          let(:colour) { '#ff0000' }

          it 'raises an exception since the subclasses Background and ' \
             'Foreground handle this' do
            proc { subject }.must_raise(Vedeu::Error::NotImplemented)
          end
        end

        context 'when the colour is not supported' do
          let(:colour) { [:not_supported] }

          before { instance.stubs(:registered?).returns(false) }

          it { subject.must_equal('') }
        end
      end

    end # Translator

  end # Colours

end # Vedeu
