# coding: UTF-8
require 'spec_helper'

class ::Suit < TypesafeEnum::Base
  new :CLUBS
  new :DIAMONDS
  new :HEARTS
  new :SPADES
end

class ::Tarot < TypesafeEnum::Base
  new :CUPS, 'Cups'
  new :COINS, 'Coins'
  new :WANDS, 'Wands'
  new :SWORDS, 'Swords'
end

class ::RGBColor < TypesafeEnum::Base
  new :RED, :red
  new :GREEN, :green
  new :BLUE, :blue
end

class ::Scale < TypesafeEnum::Base
  new :DECA, 10
  new :HECTO, 100
  new :KILO, 1_000
  new :MEGA, 1_000_000
end

module TypesafeEnum
  describe Base do

    describe '::new' do
      it ' news a constant enum value' do
        enum = Suit::CLUBS
        expect(enum).to be_a(Suit)
      end

      it 'insists symbols be symbols' do
        expect do
          class ::Cheat < Base
            new 'spades', 'spades'
          end
        end.to raise_error(TypeError)
      end

      it 'insists symbols be uppercase' do
        expect do
          class ::Cheat < Base
            new :spades, 'spades'
          end
        end.to raise_error(NameError)
      end

      it 'disallows duplicate symbols' do
        expect do
          class ::Cheat < Base
            new :SPADES, 'spades'
            new :SPADES, 'more spades'
          end
        end.to raise_error(NameError)

        expect { ::Cheat.class }.to raise_error(NameError)
      end

      it 'disallows duplicate values' do
        expect do
          class ::Cheat < Base
            new :SPADES, 'spades'
            new :ALSO_SPADES, 'spades'
          end
        end.to raise_error(NameError)

        expect { ::Cheat.class }.to raise_error(NameError)
      end

      it 'defaults the value to a lower-cased version of the symbol' do
        expect(Suit::CLUBS.value).to eq('clubs')
        expect(Suit::DIAMONDS.value).to eq('diamonds')
        expect(Suit::HEARTS.value).to eq('hearts')
        expect(Suit::SPADES.value).to eq('spades')
      end

      it 'is private' do
        expect { Tarot.new(:PENTACLES) }.to raise_error(NoMethodError)
      end
    end

    describe '::to_a' do
      it 'returns the values as an array' do
        expect(Suit.to_a).to eq([Suit::CLUBS, Suit::DIAMONDS, Suit::HEARTS, Suit::SPADES])
      end
      it 'returns a copy' do
        array = Suit.to_a
        array.clear
        expect(array.empty?).to eq(true)
        expect(Suit.to_a).to eq([Suit::CLUBS, Suit::DIAMONDS, Suit::HEARTS, Suit::SPADES])
      end
    end

    describe '::size' do
      it 'returns the number of enum instnaces' do
        expect(Suit.size).to eq(4)
      end
    end

    describe '::each' do
      it 'iterates the enum values' do
        expected = [Suit::CLUBS, Suit::DIAMONDS, Suit::HEARTS, Suit::SPADES]
        index = 0
        Suit.each do |s|
          expect(s).to be(expected[index])
          index += 1
        end
      end
    end

    describe '::each_with_index' do
      it 'iterates the enum values with indices' do
        expected = [Suit::CLUBS, Suit::DIAMONDS, Suit::HEARTS, Suit::SPADES]
        Suit.each_with_index do |s, index|
          expect(s).to be(expected[index])
        end
      end
    end

    describe '::map' do
      it 'maps enum values' do
        all_keys = Suit.map(&:key)
        expect(all_keys).to eq([:CLUBS, :DIAMONDS, :HEARTS, :SPADES])
      end
    end

    describe '#<=>' do
      it 'orders enum instances' do
        Suit.each_with_index do |s1, i1|
          Suit.each_with_index do |s2, i2|
            expect(s1 <=> s2).to eq(i1 <=> i2)
          end
        end
      end
    end

    describe '#==' do
      it 'returns true for identical instances, false otherwise' do
        Suit.each do |s1|
          Suit.each do |s2|
            identical = s1.equal?(s2)
            expect(s1 == s2).to eq(identical)
          end
        end
      end

      it 'reports instances as unequal to nil and other objects' do
        a_nil_value = nil
        Suit.each do |s|
          expect(s.nil?).to eq(false)
          expect(s == a_nil_value).to eq(false)
          Tarot.each do |t|
            expect(s == t).to eq(false)
            expect(t == s).to eq(false)
          end
        end
      end

      it 'survives marshalling' do
        Suit.each do |s1|
          dump = Marshal.dump(s1)
          s2 = Marshal.load(dump)
          expect(s1 == s2).to eq(true)
          expect(s2 == s1).to eq(true)
        end
      end
    end

    describe '#!=' do
      it 'returns false for identical instances, true otherwise' do
        Suit.each do |s1|
          Suit.each do |s2|
            different = !s1.equal?(s2)
            expect(s1 != s2).to eq(different)
          end
        end
      end

      it 'reports instances as unequal to nil and other objects' do
        a_nil_value = nil
        Suit.each do |s|
          expect(s != a_nil_value).to eq(true)
          Tarot.each do |t|
            expect(s != t).to eq(true)
            expect(t != s).to eq(true)
          end
        end
      end
    end

    describe '#hash' do
      it 'gives consistent values' do
        Suit.each do |s1|
          Suit.each do |s2|
            expect(s1.hash == s2.hash).to eq(s1 == s2)
          end
        end
      end

      it 'returns different values for different types' do
        class Suit2 < Base
          new :CLUBS, 'Clubs'
          new :DIAMONDS, 'Diamonds'
          new :HEARTS, 'Hearts'
          new :SPADES, 'Spades'
        end

        Suit.each do |s1|
          s2 = Suit2.find_by_key(s1.key)
          expect(s1.hash == s2.hash).to eq(false)
        end
      end

      it 'survives marshalling' do
        Suit.each do |s1|
          dump = Marshal.dump(s1)
          s2 = Marshal.load(dump)
          expect(s2.hash).to eq(s1.hash)
        end
      end

      it 'always returns a Fixnum' do
        Suit.each do |s1|
          expect(s1.hash).to be_a(Fixnum)
        end
      end
    end

    describe '#eql?' do
      it 'is consistent with #hash' do
        Suit.each do |s1|
          Suit.each do |s2|
            expect(s1.eql?(s2)).to eq(s1.hash == s2.hash)
          end
        end
      end
    end

    describe '#value' do
      it 'returns the string value of the enum instance' do
        expected = %w(clubs diamonds hearts spades)
        Suit.each_with_index do |s, index|
          expect(s.value).to eq(expected[index])
        end
      end
    end

    describe '#key' do
      it 'returns the symbol key of the enum instance' do
        expected = [:CLUBS, :DIAMONDS, :HEARTS, :SPADES]
        Suit.each_with_index do |s, index|
          expect(s.key).to eq(expected[index])
        end
      end
    end

    describe '#ord' do
      it 'returns the ord value of the enum instance' do
        Suit.each_with_index do |s, index|
          expect(s.ord).to eq(index)
        end
      end
    end

    describe '::find_by_key' do
      it 'maps symbol keys to enum instances' do
        keys = [:CLUBS, :DIAMONDS, :HEARTS, :SPADES]
        expected = Suit.to_a
        keys.each_with_index do |k, index|
          expect(Suit.find_by_key(k)).to be(expected[index])
        end
      end

      it 'returns nil for invalid keys' do
        expect(Suit.find_by_key(:WANDS)).to be_nil
      end
    end

    describe '::find_by_value' do
      it 'maps values to enum instances' do
        values = %w(clubs diamonds hearts spades)
        expected = Suit.to_a
        values.each_with_index do |n, index|
          expect(Suit.find_by_value(n)).to be(expected[index])
        end
      end

      it 'returns nil for invalid values' do
        expect(Suit.find_by_value('wands')).to be_nil
      end

      it 'supports enums with symbol values' do
        RGBColor.each do |c|
          expect(RGBColor.find_by_value(c.value)).to be(c)
        end
      end

      it 'supports enums with integer values' do
        Scale.each do |s|
          expect(Scale.find_by_value(s.value)).to be(s)
        end
      end
    end

    describe '::find_by_value_str' do
      it 'maps string values to enum instances' do
        values = %w(clubs diamonds hearts spades)
        expected = Suit.to_a
        values.each_with_index do |n, index|
          expect(Suit.find_by_value_str(n)).to be(expected[index])
        end
      end

      it 'returns nil for invalid values' do
        expect(Suit.find_by_value_str('wands')).to be_nil
      end

      it 'supports enums with symbol values' do
        RGBColor.each do |c|
          expect(RGBColor.find_by_value_str(c.value.to_s)).to be(c)
        end
      end

      it 'supports enums with integer values' do
        Scale.each do |s|
          expect(Scale.find_by_value_str(s.value.to_s)).to be(s)
        end
      end
    end

    describe '::find_by_ord' do

      it 'maps ordinal indices to enum instances' do
        Suit.each do |s|
          expect(Suit.find_by_ord(s.ord)).to be(s)
        end
      end

      it 'returns nil for negative indices' do
        expect(Suit.find_by_ord(-1)).to be_nil
      end

      it 'returns nil for out-of-range indices' do
        expect(Suit.find_by_ord(Suit.size)).to be_nil
      end

      it 'returns nil for invalid indices' do
        expect(Suit.find_by_ord(100)).to be_nil
      end
    end

    it 'supports case statements' do
      def pip(suit)
        case suit
        when Suit::CLUBS
          '♣'
        when Suit::DIAMONDS
          '♦'
        when Suit::HEARTS
          '♥'
        when Suit::SPADES
          '♠'
        else
          fail "unknown suit: #{self}"
        end
      end

      expect(Suit.map { |s| pip(s) }).to eq(%w(♣ ♦ ♥ ♠))
    end

    it 'supports "inner class" methods via instance_eval' do
      class ::Operation < Base
        new(:PLUS, '+').instance_eval do
          def eval(x, y)
            x + y
          end
        end
        new(:MINUS, '-').instance_eval do
          def eval(x, y)
            x - y
          end
        end
      end

      expect(Operation.map { |op| op.eval(39, 23) }).to eq([39 + 23, 39 - 23])
    end
  end
end