# encoding: utf-8
module ExerciseHelper

  # 单选
  def sigle_selection_standard_answer(params)
    size = params.ord - 96
    if size > 0 # 小写字母答案
      answer = params.ord - 96
    else
      answer = params.ord - 64
    end
  end

  # 多选
  def multiselect_standard_answer(params)
    size = params.ord - 96
    answer = ""
    if size > 0 # 小写字母答案
      for i in 0..(params.length-1)
        answer += (params[i].ord - 96).to_s
      end
    else
      for i in 0..(params.length-1)
        answer += (params[i].ord - 64).to_s
      end
    end
    answer.to_i
  end

  def fill_standart_answer(params, standart_answer)
    params.each do |param|
      standart_answer.answer_text = param.value
      standart_answer.save
    end
  end

  #判断用户是否已经提交了问卷
  def has_commit_exercise?(exercise_id, user_id)
    pu = ExerciseUser.find_by_exercise_id_and_user_id(exercise_id, user_id)
    if pu.nil?
      false
    else
      true
    end
  end

  def convert_to_char(str)
    result = ""
    length = str.length
    unless str.nil?
      if length === 1
        result += (str.to_i + 64).chr
        return result
      elsif length > 1
        for i in 0...length
          result += (str[i].to_i + 64).chr
        end
        return result
      end
    end
    return result
  end

  def get_current_score exercise
    score = 0
    unless exercise.nil?
      exercise.exercise_questions.each do |exercise_question|
        score += exercise_question.question_score
      end
      return score
    end
    return score
  end

end