class EqualityMatcher
  def initialize
    types = []
    add(types, 'Number')
    add(types, 'String')
    add(types, 'Funcref')
    add(types, 'List')
    add(types, 'Dictionary')
    add(types, 'Float')

    self.types = types
  end

  defm match(expected, actual)
    self.type_mismatch = false

    type_expected = type(expected)
    type_actual = type(actual)

    if type_expected != type_actual
      self.type_mismatch = true
      return false
    end

    return expected == actual
  end

  defm failure_message_for_match(expected, actual)
    if self.type_mismatch
      return self.type_mismatch_message(expected, actual)
    end

    expected_str = self.stringify(expected)
    actual_str = self.stringify(actual)

    return "expected “#{actual_str}” to equal “#{expected_str}”"
  end

  defm failure_message_for_mismatch(expected, actual)
    if self.type_mismatch
      return self.type_mismatch_message(expected, actual)
    end

    expected_str = self.stringify(expected)
    actual_str = self.stringify(actual)

    return "expected “#{actual_str}” to not equal “#{expected_str}”"
  end

  " private methods

  def type_mismatch_message(expected, actual)
    actual_type = self.typeof(actual)
    expected_type = self.typeof(expected)

    return "type mismatch, actual(#{string(actual)}) is “#{actual_type}”, "
      \ "expected(#{string(expected)}) is “#{expected_type}”"
  end

  def typeof(variable)
    return self.type_to_str(type(variable))
  end

  def type_to_str(num)
    return self.types[num]
  end

  def stringify(value)
    value_type = type(value)

    if value_type == type('') || value_type == type(1)
      return value
    else
      return string(value)
    end
  end

end