educoder/lib/tasks/excellent_course_exercise.rake

#coding=utf-8
# 执行示例  bundle exec rake excellent_course_exercise:student_answer args=2933,1042,823
# args 第一个是course_id, 第二个是参与人数， 第三个是通过人数
desc "同步精品课的学生试卷数据"
namespace :excellent_course_exercise do
  if ENV['args']
    course_id = ENV['args'].split(",")[0] # 对应课堂的id
    participant_count = ENV['args'].split(",")[1].to_i # 表示参与人数
    pass_count = ENV['args'].split(",")[2].to_i # 表示通过人数
  end

  task :student_answer => :environment do

    course = Course.find_by(id: course_id)

    course.exercises.each_with_index do |exercise, index|
      # 第一个试卷的参与人数和通过人数都是传的数据，后续的随机
      if index == 0
        members = course.students.order("id asc").limit(participant_count)
        update_exercise_user(exercise, members, pass_count)
      else
        new_participant_count = rand((participant_count - 423)..participant_count)
        new_pass_count = rand((new_participant_count - 113)..new_participant_count)

        members = course.students.order("id asc").limit(new_participant_count)
        update_exercise_user(exercise, members, new_pass_count)
      end
    end
  end

  def update_exercise_user exercise, members, pass_count
    exercise_question_ids = exercise.exercise_questions.where(question_type: 0).pluck(:id)

    # index < pass_count 之前的学生都是通关的，之后的未通过
    members.each_with_index do |member, index|
      exercise_user = exercise.exercise_users.where(user_id: member.user_id).take
      if exercise_question_ids.length == 20
        rand_num = index < pass_count - 1 ? 20 : rand(1..16)
      elsif exercise_question_ids.length == 17
        rand_num = index < pass_count - 1 ? rand(13..17) : rand(1..11)
      else
        rand_num = exercise_question_ids.length
      end

      if exercise_user && exercise_user.commit_status == 0
        exercise_question_ids = exercise_question_ids.sample(rand_num)
        questions = exercise.exercise_questions.where(id: exercise_question_ids)
        create_exercise_answer questions, member.user_id

        total_score = calculate_student_score(exercise, member.user)
        commit_option = {
          :status => 1,
          :commit_status => 1,
          :start_at => exercise.publish_time,
          :end_at => exercise.end_time,
          :objective_score => total_score,
          :score => total_score,
          :subjective_score => 0
        }
        exercise_user.update_columns(commit_option)
      end
    end
  end

  def create_exercise_answer questions, user_id
    questions.each do |question|
      choice_position = question.exercise_standard_answers.take&.exercise_choice_id
      choice = question.exercise_choices.where(choice_position: choice_position).take

      answer_option = {
        :user_id => user_id,
        :exercise_question_id => question.id,
        :exercise_choice_id => choice&.id,
        :answer_text => ""
      }
      ex_a = ExerciseAnswer.new(answer_option)
      ex_a.save!
    end
  end

  #计算试卷的总分和试卷的答题状态
  def calculate_student_score(exercise,user)
    score1 = 0.0 #选择题/判断题
    score2 = 0.0 #填空题
    score5 = 0.0  #实训题
    total_score = 0.0
    ques_stand = []  #问题是否正确
    exercise_questions = exercise.exercise_questions.includes(:exercise_answers,:exercise_shixun_answers,:exercise_standard_answers,:exercise_shixun_challenges)
    exercise_questions&.each do |q|
      begin
        if q.question_type != 5
          answers_content = q.exercise_answers.where(user_id: user.id)  #学生的答案
        else
          answers_content = q.exercise_shixun_answers.where(user_id: user.id)  #学生的答案
        end
        if q.question_type <= 2  #为选择题或判断题时
          if answers_content.present?   #学生有回答时
            answer_choice_array = []
            answers_content.each do |a|
              answer_choice_array.push(a.exercise_choice.choice_position)  #学生答案的位置
            end
            user_answer_content = answer_choice_array.sort
            standard_answer = q.exercise_standard_answers.pluck(:exercise_choice_id).sort  #该问题的标准答案，可能有多个
            if user_answer_content == standard_answer  #答案一致,多选或单选才给分，答案不对不给分
              if standard_answer.size > 0
                q_score_1 = q.question_score
                # q_score_1 = (q.question_score.to_f / standard_answer.count)   #当多选答案正确时，每个answer的分数均摊。
              else
                q_score_1 = 0.0
              end
              answers_content.update_all(:score => q_score_1)
              score1 = score1 + q.question_score
            else
              answers_content.update_all(:score => -1.0)
              score1 += 0.0
            end
          else
            score1 += 0.0
          end
        elsif q.question_type == 5   #实训题时，主观题这里不评分
          q.exercise_shixun_challenges&.each do |exercise_cha|
            game = Game.user_games(user.id,exercise_cha.challenge_id)&.first  #当前用户的关卡
            if game.present?
              exercise_cha_score = 0.0
              answer_status = 0
              # if game.status == 2 && game.final_score >= 0
              if game.final_score > 0
                exercise_cha_score = game.real_score(exercise_cha.question_score)
                # exercise_cha_score = exercise_cha.question_score #每一关卡的得分
                answer_status = 1
              end
              ex_shixun_answer_content = answers_content&.where(exercise_shixun_challenge_id: exercise_cha.id)
              code = nil
              if exercise_cha.challenge&.path.present?
                cha_path = challenge_path(exercise_cha.challenge&.path)
                game_challenge = game.game_codes.search_challenge_path(cha_path)&.first
                if game_challenge.present?
                  game_code = game_challenge
                  code = game_code.try(:new_code)
                else
                  code = git_fle_content(game.myshixun.repo_path,cha_path)
                end
              end
              if ex_shixun_answer_content.blank?  #把关卡的答案存入试卷的实训里
                ### Todo 实训题的_shixun_details里的代码是不是直接从这里取出就可以了？涉及到code的多个版本库的修改
                sx_option = {
                  :exercise_question_id => q.id,
                  :exercise_shixun_challenge_id => exercise_cha.id,
                  :user_id => user.id,
                  :score => exercise_cha_score.round(1),
                  :answer_text => code,
                  :status => answer_status
                }
                ExerciseShixunAnswer.create(sx_option)
              else
                ex_shixun_answer_content.first.update_attributes(score:exercise_cha_score.round(1),answer_text:code)
              end
              score5 += exercise_cha_score
            else
              score5 += 0.0
            end
          end
        end
        user_scores = answers_content.blank? ? 0.0 : answers_content.score_reviewed.pluck(:score).sum
        if user_scores > 0.0
          stand_answer = 1
        else
          stand_answer = 0
        end
        ques_option = {
          "q_id":q.id,   #该问题的id
          "q_type":q.question_type,
          "q_position":q.question_number, #该问题的位置
          "stand_status":stand_answer,  #该问题是否正确,1为正确，0为错误
          "user_score":user_scores.round(1)  #每个问题的总得分
        }
        ques_stand.push(ques_option)
      rescue Exception => e
        Rails.logger.info("calcuclate_score_have_error____________________________#{e}")
        next
      end
    end
    total_score = score1 + score2 + score5
    total_score
  end
end