#!/usr/bin/ruby

class Question
  def initialize(question)
    @question = question
    @answers = Array.new
    @correct = -1
  end

  def addAnswer(text, isCorrect)
    @answers.push(text)
    if isCorrect
      @correct = @answers.length - 1
    end
  end

  def getCorrect()
    return @correct
  end

  def getQuestion()
    return @question
  end

  def getAnswers()
    return @answers
  end
end

def emoji(n)
  return [n].pack('U*');
end

if ARGV.count != 1
  puts "usage: vwm-tester [filename]"
  abort
end

questions = Array.new

File.open(ARGV[0]) do |f|
  inQuestion = false
  f.each_line do |line|

    if line.slice(0,2) == "//" || line.length < 2
      inQuestion = false
      if questions.last.getCorrect == -1
        questions.pop
      end
        next
    end

    if inQuestion
      if line.slice(-3, 2) == "//"
        questions.last.addAnswer(line.slice(0, line.length - 3), true)
      else
        questions.last.addAnswer(line, false)
      end
    else
      if line.slice(-2,1) == ":" || line.slice(-2,1) == "?"
        inQuestion = true
        questions.push(Question.new(line))
        next
      end
    end

  end
end

option = "-"
answered = 0
correctly = 0
random = Random.new

puts "Parsed #{questions.length} questions."
puts "Test started, enter \"q\" to quit."

while option.strip != "q"
  answered += 1
  questionid = random.rand(questions.length - 1)

  puts "\n[Question #{answered}]"
  puts questions[questionid].getQuestion

  answers = questions[questionid].getAnswers
  answers.each_index do |i|
    puts " - #{(65 + i).chr}) #{answers[i]}"
  end

  option = $stdin.readline

  if option.length == 0
    next
  end

  correct = questions[questionid].getCorrect
  print "\n"

  if (option.upcase.strip.ord - 65) == correct || (option.strip.to_f - 1) == correct
    correctly += 1
    print "#{emoji(9989)} CORRECT!"
    puts "\t\t#{correctly}/#{answered}, #{((correctly.to_f/answered) * 100).round(2)} %"
  else
    print "#{emoji(128308)} WRONG!"
    puts "\t\t#{correctly}/#{answered}, #{((correctly.to_f/answered) * 100).round(2)} %"
    puts "#{(65 + correct).chr}) #{answers[correct]}"
  end
end