# frozen_string_literal: true

module RubyAlgebra
  # Команда интерпретатора
  class Command
  end

  # Команда присвоения
  class AssignmentCommand < Command
    attr_reader :lhs, :operation, :operand1, :operand2

    def initialize(lhs, operation, operand1, operand2)
      @lhs = lhs
      @operation = operation
      @operand1 = operand1
      @operand2 = operand2
    end

    def to_s
      result = @lhs.is_a?(Array) ? @lhs.join(', ') : @lhs.to_s
      result += ' := '
      result += @operand1.to_s
      case @operation
      when :add
        result += ' + '
      when :sub
        result += ' - '
      when :mult, :scale
        result += ' * '
      when :div
        result += ' / '
      end
      result += @operand2.to_s if @operation != :assign
      result
    end
  end

  # Команда вывода на экран
  class DisplayCommand < Command
    attr_reader :polynomial

    def initialize(polynomial)
      @polynomial = polynomial
    end
  end
end