educoder/app/controllers/exercise_bank_questions_controller.rb

class ExerciseBankQuestionsController < ApplicationController
  before_action :require_login, :check_auth  #用户需登陆
  before_action :get_exercise, only:[:create]  #获取试卷
  before_action :get_exercise_question, except: [:create]  #获取试卷的问题及试卷
  before_action :bank_admin  #是否为老师
  before_action :validate_params, only: [:create, :update]  #传入参数的验证

  def create
    ActiveRecord::Base.transaction do
      begin
        question_options = {
          :question_title => params[:question_title],
          :question_type => params[:question_type].present? ? params[:question_type].to_i : 0,  #默认为单选题
          :question_number => @exercise.exercise_bank_questions.count + 1,
          :question_score => params[:question_score].present? ? params[:question_score].to_f.round(1) : 5.0,
          :shixun_id => params[:shixun_id].blank? ? "" : params[:shixun_id],
          :is_ordered => params[:is_ordered]  # 填空题的答案是否为一一对应关系,默认为true即为一一对应
        }
        @exercise_question  = @exercise.exercise_bank_questions.new(question_options)
        #插入问题时，那么从插入的这个id以后的question_num都将要+1
        if params[:insert_id].present?
          insert_exercise = @exercise.exercise_bank_questions.find_by(id: params[:insert_id])
          if insert_exercise.present?  #如果该问题存在的话，意思是如果是第一题，那么就不存在插入
            ques_num = insert_exercise.question_number.to_i
            @exercise_question.question_number = ques_num + 1  #更新了问题的位置
            @exercise.exercise_bank_questions.insert_question_ex(ques_num).update_all("question_number = question_number + 1")
          end
        end

        if @exercise_question.save
          #为选择题(包括单选和多选)的时候,创建问题选项
          ques_type = @exercise_question.question_type
          if ques_type <= Exercise::MULTIPLE
            choices_array = params[:question_choices]
            choices_count= choices_array.count
            standard_answer = params[:standard_answers] #为数组格式，因为可能会有单选和多选，标准答案，已提前判断不能为空,
            standard_answer = standard_answer.uniq.reject(&:blank?)
            (1..choices_count).each do |c|
              choice = choices_array[c-1]  #每一个选项的内容
              choice_option = {
                :choice_position => c,
                :choice_text => choice.strip
              }
              question_choices = @exercise_question.exercise_bank_choices.new(choice_option)
              question_choices.save
            end
            #标准答案的存储，如：["1","2","3"..]等，1对应A，2对应B，3对应C。。。
            standard_answer.each do |a|
              choice_id = a.to_i
              standard_option = {
                :exercise_bank_question_id => @exercise_question.id,
                :exercise_bank_choice_id => choice_id  #即为选择的位置参数
              }
              question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
              question_standard_answer.save
              if standard_answer.count > 1 && ques_type == Exercise::SINGLE  #当标准答案数大于1，且不为多选时，修改为多选
                @exercise_question.update_attribute("question_type",Exercise::MULTIPLE)
              elsif standard_answer.count == 1 && ques_type == Exercise::MULTIPLE
                @exercise_question.update_attribute("question_type",Exercise::SINGLE)
              end
            end
          elsif ques_type == Exercise::JUDGMENT  #这个为判断题
            choices_array = params[:question_choices]  #判断的选项，对/错等等
            choices_count= choices_array.count
            (1..choices_count).each do |c|
              choice = choices_array[c-1]  #每一个选项的内容
              choice_option = {
                :choice_position => c,
                :choice_text => choice.strip
              }
              question_choices = @exercise_question.exercise_bank_choices.create(choice_option)
              question_choices.save
            end
            standard_answer = params[:standard_answers]  #对应选项的id
            standard_option = {
              :exercise_bank_question_id => @exercise_question.id,
              :exercise_bank_choice_id => standard_answer.first.to_i
            }
            question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
            question_standard_answer.save
          elsif ques_type == Exercise::COMPLETION  #填空题，每空的参考答案有多个，那么以位置对应
            standard_answer = params[:standard_answers]
            standard_answer.each do |a|
              null_choice_id = a[:choice_id]
              null_choice_text = a[:answer_text]
              null_choice_text.each do |n|
                standard_option = {
                  :exercise_bank_question_id => @exercise_question.id,
                  :exercise_bank_choice_id => null_choice_id,
                  :answer_text => n
                }
                question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
                question_standard_answer.save
              end
            end
          elsif ques_type == Exercise::SUBJECTIVE  #简答题
            if params[:standard_answers].present? && params[:standard_answers].reject(&:blank?).count > 0
              standard_answer = params[:standard_answers]
              standard_answer.each do |a|
                standard_option = {
                  :exercise_bank_question_id => @exercise_question.id,
                  :answer_text => a,
                }
                question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
                question_standard_answer.save
              end
            end
          elsif ques_type == Exercise::PRACTICAL  #实训题
            shixun = Shixun.find_by(id: params[:shixun_id])
            shixun_scores = params[:question_scores]  #试卷有多个的分值有多个分数表，所以为分数的数组
            shixun_name = params[:shixun_name] || shixun.name
            question_score = 0
            shixun.challenges.try(:each_with_index) do |challenge,index|
              shixun_option = {
                :challenge_id => challenge.id,
                :shixun_id => shixun.id,
                :exercise_bank_question_id => @exercise_question.id,
                :position => (index + 1),
                :question_score => shixun_scores[index].present? ? shixun_scores[index].to_f.round(1) : 5
              }
              ex_shixun_challenge = ExerciseBankShixunChallenge.create(shixun_option)
              question_score += ex_shixun_challenge.question_score   # 问题的分数，为各个关卡分数的总和
            end
            @exercise_question.update_attributes(:question_score => question_score, :shixun_name=> shixun_name)
          end
        end
        normal_status("创建成功")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception(e.message)
        raise ActiveRecord::Rollback
      end
    end
  end

  def update
    ActiveRecord::Base.transaction do
      begin
        # 更新试卷题目的内容
        question_options = {
          :question_title => params[:question_title],
          :is_ordered => params[:is_ordered],  # 填空题的答案是否为一一对应关系,默认为true即为一一对应
          :question_score => params[:question_score].present? ? params[:question_score].to_f.round(1) : 5.0  #不可修改分数
        }
        choices_array = params[:question_choices]
        stan_answer_params = params[:standard_answers]
        standard_answer = stan_answer_params.present? ? stan_answer_params.uniq.reject(&:blank?) : []
        @exercise_question.update_attributes(question_options)
        #当选项存在时，可修改选项内容，但是不能更改选项的位置（即不能增删选项）
        if choices_array.present?
          ex_choices = @exercise_question.exercise_bank_choices
          ex_choice_count = ex_choices.count
          choice_array_count = choices_array.count
          ex_choice_count_array = (1..ex_choice_count).to_a
          choice_array_count_array = (1..choice_array_count).to_a
          if ex_choice_count > choice_array_count   #如果选项有减少的，那么只更新传入的，删除以前的
            choice_array_count_array.each do |c|
              choice = choices_array[c-1]  #每一个选项的内容
              exercise_choice = @exercise_question.exercise_bank_choices.find_choice_custom("choice_position",(c))
              exercise_choice.update(choice_text:choice)
            end
            drop_ex_choice = @exercise_question.exercise_bank_choices.left_choice_choose("choice_position",(choice_array_count))
            drop_ex_choice.destroy_all
          else
            ex_choice_count_array.each do |c|
              choice = choices_array[c-1]  #每一个选项的内容
              exercise_choice = @exercise_question.exercise_bank_choices.find_choice_custom("choice_position",(c))
              exercise_choice.update(choice_text:choice)
            end
            new_add_choice = choice_array_count_array - ex_choice_count_array  #新传入的需新增
            if new_add_choice.count > 0
              new_add_choice.each do |i|
                choice_option = {
                  :choice_position => i,
                  :choice_text => choices_array[i-1].strip
                }
                question_choices = @exercise_question.exercise_bank_choices.new(choice_option)
                question_choices.save
              end
            end
          end
        end
        #试卷未发布时，当标准答案存在时，可修改标准答案内容，可增删标准答案，否则只能修改标准答案，不能增删标准答案
        @exercise_answers_array = @exercise_question.exercise_bank_standard_answers  #问卷的全部标准答案
        if standard_answer.present?
          if @exercise_question.question_type <= Exercise::JUDGMENT #选择题/判断题，标准答案为一个或多个
            exercise_standard_choices = @exercise_answers_array.pluck(:exercise_bank_choice_id) #问题以前的全部标准答案选项位置
            if exercise_standard_choices.sort != standard_answer.sort   #表示答案有更改的
              common_standard_choices = standard_answer & exercise_standard_choices # 传入的标准答案的选项位置和以前的并集，即表示不用做更改的
              old_left_standard_choices = exercise_standard_choices - common_standard_choices # 以前的差集共同的，剩余的表示需要删掉
              new_left_standard_choices = standard_answer - common_standard_choices # 传入的标准答案差集共同的，剩余的表示需要新建
              if old_left_standard_choices.count > 0
                @exercise_answers_array.standard_by_ids(old_left_standard_choices).destroy_all
              end
              if new_left_standard_choices.count > 0  #新建标准答案
                new_left_standard_choices.each do |s|
                  standard_option = {
                    :exercise_bank_question_id => @exercise_question.id,
                    :exercise_bank_choice_id => s.to_i  #即为选择的位置参数
                  }
                  question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
                  question_standard_answer.save
                end

              end
              if standard_answer.count > 1 && @exercise_question.question_type == Exercise::SINGLE  #当标准答案数大于1，且不为多选时，修改为多选
                @exercise_question.update_attribute("question_type",Exercise::MULTIPLE)
              elsif standard_answer.count == 1 && @exercise_question.question_type == Exercise::MULTIPLE
                @exercise_question.update_attribute("question_type",Exercise::SINGLE)
              end
            end
          elsif @exercise_question.question_type == Exercise::COMPLETION  #填空题
            old_ex_answer = @exercise_question.exercise_bank_standard_answers  #当前问题的全部标准答案
            old_ex_answer_choice_texts = old_ex_answer.pluck(:answer_text).uniq.sort
            new_ex_answer_choice_texts = standard_answer.pluck(:answer_text).sum.uniq.sort
            if old_ex_answer_choice_texts != new_ex_answer_choice_texts  #填空题标准答案有更改时，才会更新标准答案
              new_ex_answer_choice_ids = standard_answer.map {|a| a[:choice_id]}.uniq   #新传入的答案数组序号
              old_ex_answer_choice_ids = old_ex_answer.pluck(:exercise_bank_choice_id).uniq   #全部的答案数组序号
              #删除多余的选项
              if old_ex_answer_choice_ids.count > new_ex_answer_choice_ids.count  #有减少的填空
                delete_ex_answer_choice_ids = old_ex_answer_choice_ids - new_ex_answer_choice_ids
                old_ex_answer.standard_by_ids(delete_ex_answer_choice_ids).destroy_all
              end
              standard_answer.each do |aa|
                null_choice_id = aa[:choice_id]
                null_choice_text = aa[:answer_text]
                null_choice_text_count = null_choice_text.count  #当前传入的答案数量
                null_choice_text_count_array = (1..null_choice_text_count).to_a

                ex_answer_pre = old_ex_answer.standard_by_ids(null_choice_id)  #当前问题的全部答案
                ex_answer_pre_count = ex_answer_pre.count
                ex_answer_pre_count_array = (1..ex_answer_pre_count).to_a

                if old_ex_answer_choice_ids.include?(null_choice_id)  #以前的填空题答案包含有现在的填空序号
                  if null_choice_text_count >= ex_answer_pre_count
                    new_add_choice = null_choice_text_count_array - ex_answer_pre_count_array
                    ex_answer_pre_count_array.each do |n|
                      standard_option = {
                        :exercise_bank_question_id => @exercise_question.id,
                        :exercise_bank_choice_id => null_choice_id,
                        :answer_text => null_choice_text[n-1]
                      }
                      ex_answer_pre[n-1].update(standard_option)
                    end
                    if new_add_choice.count > 0  #表示有新增的
                      new_add_choice.each do |i|
                        standard_option = {
                          :exercise_bank_question_id => @exercise_question.id,
                          :exercise_bank_choice_id => null_choice_id,
                          :answer_text => null_choice_text[i-1]
                        }
                        question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
                        question_standard_answer.save
                      end
                    end
                  else
                    new_delete_choice = ex_answer_pre_count_array - null_choice_text_count_array
                    null_choice_text.each_with_index do |n,index|
                      standard_option = {
                        :exercise_bank_question_id => @exercise_question.id,
                        :exercise_bank_choice_id => null_choice_id,
                        :answer_text => n
                      }
                      ex_answer_pre[index].update(standard_option)
                    end
                    if new_delete_choice.count > 0  #表示填空题的答案有删减的
                      new_delete_choice.each do |d|
                        ex_answer_pre[d-1].destroy
                      end
                    end
                  end
                else
                  null_choice_text.each do |n|
                    standard_option = {
                      :exercise_bank_question_id => @exercise_question.id,
                      :exercise_bank_choice_id => null_choice_id,
                      :answer_text => n
                    }
                    question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
                    question_standard_answer.save
                  end
                end
              end
            end
          end
        end
        if @exercise_question.question_type == Exercise::SUBJECTIVE  #主观题
          main_standard_answer = standard_answer.present? ? standard_answer.first : nil
          if @exercise_answers_array.present?
            @exercise_answers_array.first.update_attribute("answer_text",main_standard_answer)
          else
            standard_option = {
              :exercise_bank_question_id => @exercise_question.id,
              :answer_text => main_standard_answer,
            }
            question_standard_answer = ExerciseBankStandardAnswer.new(standard_option)
            question_standard_answer.save
          end
        elsif @exercise_question.question_type == Exercise::PRACTICAL
          question_score = 0
          shixun_name = params[:shixun_name] || @exercise_question.shixun_name
          @exercise_question.exercise_bank_shixun_challenges.each_with_index do |challenge, index|
            challenge.question_score = params[:question_scores][index].to_f.round(1)
            challenge.save
            question_score += params[:question_scores][index].to_f.round(1)
          end
          @exercise_question.question_score = question_score
          @exercise_question.shixun_name = shixun_name
          @exercise_question.save
        end
        normal_status(0,"试卷更新成功")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception(e.message)
        raise ActiveRecord::Rollback
      end
    end
  end

  def up_down
    ActiveRecord::Base.transaction do
      begin
        opr = params[:opr]
        current_q_p = @exercise_question.question_number.to_i  #问题的当前位置
        if opr.present?
          if opr.to_s == "up"
            last_q_p = @exercise.exercise_bank_questions.find_by(question_number: (current_q_p - 1))  # 当前问题的前一个问题
            if last_q_p.present?
              @exercise_question.update_attribute('question_number', (current_q_p - 1))
              last_q_p.update_attribute('question_number', current_q_p) # 重新获取当前问题的位置
              normal_status(0, "问题上移成功！")
            else
              normal_status(-1, "移动失败，已经是第一个问题了！")
            end
          elsif opr.to_s == "down"
            next_q_p = @exercise.exercise_bank_questions.find_by(question_number: (current_q_p + 1))  # 当前问题的前一个问题
            if next_q_p.present?
              @exercise_question.update_attribute('question_number', (current_q_p + 1))
              next_q_p.update_attribute('question_number', current_q_p)
              normal_status(0, "问题下移成功！")
            else
              normal_status(-1, "移动失败，已经是最后一个问题了！")
            end
          end
        else
          normal_status(-1, "移动失败，请输入参数")
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception(e.message)
      end
    end
  end

  #试卷问题的删除
  def destroy
    ActiveRecord::Base.transaction do
      begin
        question_d_id = @exercise_question.question_number.to_i  #问题的当前位置
        exercise_questions = @exercise.exercise_bank_questions
        left_questions = exercise_questions.where("question_number > ?", question_d_id)
        left_questions.update_all("question_number = question_number - 1") if left_questions
        @exercise_question.destroy
        normal_status(0, "删除成功")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception(e.message)
      end
    end
  end

  private

  def bank_admin
    tip_exception(403, "无权限") unless @exercise.user_id == current_user.id || current_user.admin?
  end

  def get_exercise
    @exercise = ExerciseBank.find_by!(id:params[:exercise_bank_id])
  end

  def get_exercise_question
    @exercise_question = ExerciseBankQuestion.find_by!(id: params[:id])
    @exercise = @exercise_question.exercise_bank
  end

  def validate_params
    normal_status(-1,"题目不允许为空！") if (params[:question_title].blank? && params[:question_type].to_i != Exercise::PRACTICAL ) #除了实训题，其余题目必需有题干
    normal_status(-1,"问题类型不允许为空！" ) if params[:question_type].blank?
    normal_status(-1,"分值不允许为空！" ) if params[:question_score].blank? && params[:question_scores].blank?  #分值的数组或参数必需存在一个
    if params[:question_score].present? && params[:question_score].to_f <= 0.0  #问题类型存在，则分值不能为空,且必需大于0
      normal_status(-1,"分值必需大于0！")
    elsif (params[:question_score].present? && params[:question_score].to_f.round(1) > 100.0) || (params[:question_scores].present? && (params[:question_scores].map{|a| a.to_f.round(1)}.max > 100.0))
      normal_status(-1,"分值不能超过100分！")
    elsif params[:question_scores].present? && params[:question_scores].include?(0.0) #如果有负数，则自动取绝对值，#多个分数值，针对实训题的
      normal_status(-1,"分值必需大于0！")
    elsif params[:standard_answers].present? && params[:question_choices].present? && (params[:standard_answers].count > params[:question_choices].count)
      normal_status(-1,"标准答案数不能大于选项数！")
    elsif [0,1,2,3].include?(params[:question_type].to_i) && (params[:standard_answers].blank? || params[:standard_answers].include?("")) #选择题/判断题/填空题 问题选项/标准答案不能为空,也不能包含空的内容
      normal_status(-1,"标准答案不能为空！")
    elsif params[:question_type].to_i == 2 && (params[:standard_answers].count > 1 || params[:question_choices].blank? || params[:question_choices].include?("")) #判断题的标准答案不能大于1个，选项不能为空
      normal_status(-1,"判断题选项不能为空/标准答案不能大于1个！")
    elsif params[:question_type].to_i <= 1 && (params[:question_choices].blank? || params[:question_choices].include?("") || params[:question_choices].count < 2) #选择题选项不能为空,且不能小于2
      normal_status(-1,"选择题选项内容不能为空，且不能少于2个！")
    elsif params[:question_type].to_i == 3 && (params[:standard_answers].blank? || params[:standard_answers].count > 5 ) #填空题选项最多为5个,且如果为1个的话，不允许修改is_ordered
      normal_status(-1,"填空题标准答案不能为空/不能超过5个！")
    elsif params[:question_type].to_i == 4 && params[:standard_answers].count > 2 #简单题参考答案最多为1个
      normal_status(-1,"简答题的参考答案不能大于2个！")
    elsif params[:question_type].to_i == 5
      if params[:shixun_id].blank?  #实训题的id不能为空
        normal_status(-1,"实训题id不能为空！")
      elsif params[:shixun_name].blank?
        normal_status(-1,"实训题名称不能为空！")
      end
    end
  end

end