require 'spec_helper'
require 'set'

describe Immutable do
  expectations = [
    # [Ruby, Immutable]
    [ { 'a' => 1,
        'b' => [2, {'c' => 3}, 4],
        'd' => ::Set.new([5, 6, 7]),
        'e' => {'f' => 8, 'g' => 9},
        'h' => Regexp.new('ijk') },
      Immutable::Hash[
        'a' => 1,
        'b' => Immutable::Vector[2, Immutable::Hash['c' => 3], 4],
        'd' => Immutable::Set[5, 6, 7],
        'e' => Immutable::Hash['f' => 8, 'g' => 9],
        'h' => Regexp.new('ijk') ] ],
    [ {}, Immutable::Hash[] ],
    [ {'a' => 1, 'b' => 2, 'c' => 3}, Immutable::Hash['a' => 1, 'b' => 2, 'c' => 3] ],
    [ [], Immutable::Vector[] ],
    [ [1, 2, 3], Immutable::Vector[1, 2, 3] ],
    [ ::Set.new, Immutable::Set[] ],
    [ ::Set.new([1, 2, 3]), Immutable::Set[1, 2, 3] ],
    [ 42, 42 ],
    [ STDOUT, STDOUT ],

    # Struct conversion is one-way (from Ruby core Struct to Immutable::Hash), not back again!
    [ Struct::Customer.new, Immutable::Hash[name: nil, address: nil], true ],
    [ Struct::Customer.new('Dave', '123 Main'), Immutable::Hash[name: 'Dave', address: '123 Main'], true ]
  ]

  describe '.from' do
    expectations.each do |input, expected_result|
      context "with #{input.inspect} as input" do
        it "should return #{expected_result.inspect}" do
          Immutable.from(input).should eql(expected_result)
        end
      end
    end

    context 'with mixed object' do
      it 'should return Immutable data' do
        input = {
          'a' => 'b',
          'c' => {'d' => 'e'},
          'f' => Immutable::Vector['g', 'h', []],
          'i' => Immutable::Hash['j' => {}, 'k' => Immutable::Set[[], {}]] }
        expected_result = Immutable::Hash[
          'a' => 'b',
          'c' => Immutable::Hash['d' => 'e'],
          'f' => Immutable::Vector['g', 'h', Immutable::EmptyVector],
          'i' => Immutable::Hash['j' => Immutable::EmptyHash, 'k' => Immutable::Set[Immutable::EmptyVector, Immutable::EmptyHash]] ]
        Immutable.from(input).should eql(expected_result)
      end
    end
  end

  describe '.to_ruby' do
    expectations.each do |expected_result, input, one_way|
      next if one_way
      context "with #{input.inspect} as input" do
        it "should return #{expected_result.inspect}" do
          Immutable.to_ruby(input).should eql(expected_result)
        end
      end
    end

    context 'with Immutable::Deque[] as input' do
      it 'should return []' do
        Immutable.to_ruby(Immutable::Deque[]).should eql([])
      end
    end

    context 'with Immutable::Deque[Immutable::Hash["a" => 1]] as input' do
      it 'should return [{"a" => 1}]' do
        Immutable.to_ruby(Immutable::Deque[Immutable::Hash['a' => 1]]).should eql([{'a' => 1}])
      end
    end

    context 'with Immutable::SortedSet[] as input' do
      it 'should return ::SortedSet.new' do
        Immutable.to_ruby(Immutable::SortedSet[]).should == ::SortedSet.new
      end
    end

    context 'with Immutable::SortedSet[1, 2, 3] as input' do
      it 'should return ::SortedSet.new' do
        Immutable.to_ruby(Immutable::SortedSet[1, 2, 3]).should == ::SortedSet.new([1, 2, 3])
      end
    end

    context 'with mixed object' do
      it 'should return Ruby data structures' do
        input = Immutable::Hash[
          'a' => 'b',
          'c' => {'d' => 'e'},
          'f' => Immutable::Vector['g', 'h'],
          'i' => {'j' => Immutable::EmptyHash, 'k' => Set.new([Immutable::EmptyVector, Immutable::EmptyHash])}]
        expected_result = {
          'a' => 'b',
          'c' => {'d' => 'e'},
          'f' => ['g', 'h'],
          'i' => {'j' => {}, 'k' => Set.new([[], {}])} }
        Immutable.to_ruby(input).should eql(expected_result)
      end
    end
  end
end