class ExercisesController < ApplicationController
  before_action :require_login, :check_auth, except: [:index]
  before_action :find_course,only: [:index,:new,:create,:my_exercises,:public_exercises,:set_public,:destroys,
                                    :join_exercise_banks,:publish_modal,:publish,:end_modal,:end_exercise] #需要有课堂id参数的
  before_action :get_exercise,except: [:index,:new,:create,:my_exercises,:public_exercises,:set_public,:destroys,
                                       :join_exercise_banks,:publish_modal,:publish,:end_modal,:end_exercise]
  before_action :user_course_identity
  before_action :is_course_teacher,except: [:index,:start_answer,:exercise_setting,:commit_exercise,:exercise_lists,:review_exercise,
                                            :exercise_result,:common_header,:cancel_exercise,:begin_commit]
  before_action :get_left_banner_id,only:[:common_header,:start_answer,:review_exercise,:index,:new,:edit]
  before_action :validates_exercise_params,only: [:create,:update]
  before_action :get_exercise_question_counts,only: [:show,:edit,:start_answer,:review_exercise,:blank_exercise,:export_exercise]
  before_action :validate_publish_time,only: [:commit_setting] #提交设置时，需判断时间是否符合
  before_action :check_course_public,only: [:set_public]
  before_action :check_user_on_answer,only: [:show,:start_answer,:exercise_lists] #判断当前用户在试卷的权限/老师是否属于分班的权限
  before_action :only_student_in,only: [:start_answer]
  before_action :check_user_id_start_answer,only: [:start_answer,:review_exercise]
  # before_action :commit_user_exercise,only: [:start_answer,:exercise_lists,:review_exercise]   #已有定时的任务
  before_action :check_exercise_time,only: [:commit_exercise] #提交试卷时，判断时间是否超过
  before_action :check_exercise_status,only: [:redo_modal,:redo_exercise]
  before_action :check_exercise_is_end, only: [:review_exercise]
  before_action :check_exercise_public,only: [:exercise_result]  #试卷是否为公开
  before_action :commit_shixun_present,only: [:commit_shixun]
  include ExportHelper
  include ExercisesHelper

  def index
    ActiveRecord::Base.transaction do
      begin
        # 按发布时间或创建时间排序
        @exercises_all = @course.exercises
        member_show_exercises = @exercises_all.is_exercise_published  #已发布的或已截止的试卷
        @current_user_ = current_user

        # 课堂的学生人数
        @course_all_members = @course.students #当前课堂的全部学生
        @current_student = @course_all_members.course_find_by_ids("user_id",current_user.id)  #当前用户是否为课堂的学生

        # exercises的不同用户群体的显示
        if @user_course_identity < Course::STUDENT      # @is_teacher_or 1为老师/管理员/助教
          @is_teacher_or = 1
          @exercises = @exercises_all                  #老师能看到全部的试卷，不管是已发布的/未发布的/已截止的/统一设置的/私有设置的（看到内容不同）
        elsif @user_course_identity == Course::STUDENT  # 2为课堂成员，能看到统一设置的和自己班级的
          @is_teacher_or = 2
          @member_group_id = @current_student.first.try(:course_group_id).to_i  # 成员的分班id，默认为0
          if @member_group_id == 0   #表示是课堂的未分班成员,只能查看统一设置的试卷（已发布的/已截止的）
            @exercises = member_show_exercises.exists? ? member_show_exercises.unified_setting : []
          else  #已分班级的成员，可以查看统一设置和单独设置（试卷是发布在该班级）试卷
            # 已发布 当前用户班级分组的 试卷id
            not_exercise_ids = @course.exercise_group_settings.exercise_group_not_published.where("course_group_id = #{@member_group_id}").pluck(:exercise_id)
            @exercises = member_show_exercises.where.not(id: not_exercise_ids)
          end
        else  #用户未登陆或不是该课堂成员,仅显示统一设置的（已发布的/已截止的），如有公开，则不显示锁，不公开，则显示锁
          @is_teacher_or = 0
          @exercises = member_show_exercises.unified_setting
        end

        if @exercises.size > 0
          if params[:type].present?
            choose_type = params[:type].to_i
            ex_setting_ids = []
            if @is_teacher_or != 2
              @exercises = @exercises.where("exercise_status = #{choose_type}")
            else
              case choose_type
              when 1
                ex_setting_ids = @course.exercise_group_settings.where("course_group_id = #{@member_group_id}").exercise_group_not_published.pluck(:exercise_id)
              when 2
                ex_setting_ids = @course.exercise_group_settings.where("course_group_id = #{@member_group_id}")
                                     .where("publish_time is not null and publish_time <= ? and end_time > ?",Time.now,Time.now).pluck(:exercise_id)
              when 3
                ex_setting_ids = @course.exercise_group_settings.where("course_group_id = #{@member_group_id}").exercise_group_ended.pluck(:exercise_id)
              end
              unified_setting_ids = @exercises.unified_setting.where("exercise_status = #{choose_type}").pluck(:id)
              ex_ids = (ex_setting_ids + unified_setting_ids).uniq
              @exercises = @exercises.where(id: ex_ids)
            end
          end

          if params[:search].present?
            search_type = params[:search].to_s.strip
            @exercises = @exercises.exercise_search(search_type)
          end

          @exercises_select_count = @exercises.size   # 全部页面，需返回
          @exercises = @exercises.distinct.order( "IF(ISNULL(publish_time),0,1), publish_time DESC,created_at DESC")   #出现错误

          # 分页
          @page  = params[:page]  || 1
          @limit = params[:limit] || 15
          @exercises = @exercises.page(@page).per(@limit)
          @exercises = @exercises&.includes(:published_settings)
        else
          @exercises = []
        end

        @course_all_members_count = @course_all_members.size  #当前课堂的学生数
        @exercises_count = @exercises_all.size   # 全部页面，需返回
        @exercises_unpublish_counts = @exercises_all.exercise_by_status(1).size #未发布的试卷数
        @exercises_published_counts = @exercises_count - @exercises_unpublish_counts  # 已发布的试卷数,包含已截止的

      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception(e.message)
        raise ActiveRecord::Rollback
      end
    end
  end

  def new
    ActiveRecord::Base.transaction do
      begin
        @exercise = Exercise.new
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷创建失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  def create
    ActiveRecord::Base.transaction do
      begin
        ex_name = params[:exercise_name]
        ex_desc = params[:exercise_description]
        exercise_options = {
            :exercise_name => ex_name,
            :exercise_description => ex_desc,
            :user_id => current_user.id,
            :course_id => @course.id,
            :time => -1,
            :exercise_status => 1
        }
        @exercise = Exercise.create(exercise_options)
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷创建失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #试卷的内容，及试题/答案的内容编辑
  def edit
    ActiveRecord::Base.transaction do
      begin
        @exercise_questions = @exercise.exercise_questions.order("question_number ASC")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷创建失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  def update
    ActiveRecord::Base.transaction do
      begin
        ex_name = params[:exercise_name]
        ex_desc = params[:exercise_description]
        exercise_options = {
            :exercise_name => ex_name,
            :exercise_description => ex_desc,
        }
        @exercise.update_attributes(exercise_options)
        normal_status(0,"试卷更新成功！")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷创建失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  def show
    ActiveRecord::Base.transaction do
      begin
        if @user_course_identity < Course::STUDENT
          @is_teacher_or = 1  #为老师/助教/管理员
        else
          @is_teacher_or = 0  #为学生
        end
        @exercise_questions = @exercise.exercise_questions&.includes(:exercise_choices,:exercise_shixun_challenges,:exercise_standard_answers).order("question_number ASC")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷创建失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #试卷的公用头部
  def common_header
    ActiveRecord::Base.transaction do
      begin
        @user_left_time = nil
        if @user_course_identity > Course::ASSISTANT_PROFESSOR
          @is_teacher_or = 0
          @user_exercise_answer = @exercise.check_user_answer_status(current_user)
          @user_commit_counts = 0
          @user_left_time = get_exercise_left_time(@exercise,current_user)
        else
          @is_teacher_or = 1
          @user_exercise_answer = 3  #教师页面
          @user_commit_counts = @exercise.exercise_users.where(commit_status:1).size   #已提交的用户数
        end
        @ex_status = @exercise.get_exercise_status(current_user)

        exercise_id_array = [@exercise.id]
        @exercise_publish_count = get_user_permission_course(exercise_id_array,Exercise::PUBLISHED).size   #是否存在已发布的
        @exercise_unpublish_count = get_user_permission_course(exercise_id_array,Exercise::UNPUBLISHED).size  #是否存在未发布的

        if (@exercise_publish_count == 0) && (@exercise_unpublish_count == 0)  #即表示没有分班
          if @ex_status == Exercise::UNPUBLISHED
            @exercise_unpublish_count = 1   #试卷未发布，且课堂没有分班的时候
          elsif @ex_status == Exercise::PUBLISHED
            @exercise_publish_count = 1   #试卷未发布，且课堂没有分班的时候
          end
        end

      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("没有权限")
        raise ActiveRecord::Rollback
      end
    end
  end

  #实训题目的选用
  def choose_shixun
    ActiveRecord::Base.transaction do
      begin
        search = params[:search]
        if @user_course_identity > Course::ADMIN  #当不为管理员的时候
          user_school_id = current_user.school_id  #当前用户的学校id
          if user_school_id.present?
            none_shixun_ids = ShixunSchool.where("school_id != #{user_school_id}").pluck(:shixun_id)
            @publish_shixuns = Shixun.where.not(id: none_shixun_ids).unhidden
          end
        else
          @publish_shixuns = Shixun.unhidden
        end
        if search.present?
          @publish_shixuns = @publish_shixuns.search_by_name(search)
        end

        @shixuns = @publish_shixuns.joins(:challenges).where("challenges.st != 0").distinct
        # 全部页面，需返回
        @shixuns_count = @shixuns.count

        # 分页
        @page  = params[:page]  || 1
        @limit = params[:limit] || 8

        @shixuns = @shixuns.page(@page).per(@limit)
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("实训选择失败！")
      end
    end
  end

  #确认实训的选择
  def commit_shixun
    ActiveRecord::Base.transaction do
      begin
        @shixun_challenges = @shixun.challenges
        @shixun_challenges_count = @shixun_challenges.size
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("页面调用失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  # 首页批量或单独删除
  def destroys
    ActiveRecord::Base.transaction do
      begin
        check_ids = Exercise.where(id: params[:check_ids])
        check_ids.destroy_all
        normal_status(0, "试卷已删除成功！")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷删除失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  # 设为公开
  def set_public
    ActiveRecord::Base.transaction do
      begin
        check_ids = Exercise.where(id: params[:check_ids])
        check_ids.each do |exercise|
          exercise.update_attribute('is_public', true)
        end
        normal_status(0, "试卷已设为公开！")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷设为公开失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  ## 加入题库
  def join_exercise_banks
    ActiveRecord::Base.transaction do
      begin
        check_ids = Exercise.where(id: params[:check_ids])
        check_ids.each do |exercise|
          current_ex_bank = current_user.exercise_banks.find_by_container(exercise.id,"Exercise")&.first
          if current_ex_bank.present?  #当前用户的选择试卷是否已加入习题库，存在则更新习题库和问题库，否则新建习题库和问题库
            ex_params = {
                :name => exercise.exercise_name,
                :description => exercise.exercise_description,
                :course_list_id => exercise.course.try(:course_list_id)
            }
            current_ex_bank.update_attributes(ex_params)
            # question_bank = QuestionBank.ques_by_container(current_ex_bank.id,current_ex_bank.container_type).first  #该习题库是否存在于问题库里
            # ques_params = {
            #     :name => current_ex_bank.name,
            #     :course_list_id => current_ex_bank.course_list_id
            # }
            # question_bank.update_attributes(ques_params) if question_bank.present?
            current_ex_bank.exercise_bank_questions.destroy_all  # 更新后，习题库的问题全部删除，后续重新再建
          else
            ex_params = {
                :name => exercise.exercise_name,
                :description => exercise.exercise_description,
                :user_id => current_user.id,
                :is_public => 0,
                :course_list_id => exercise.course.try(:course_list_id),
                :container_id => exercise.id,
                :container_type => "Exercise",
                :quotes => 1
            }
            current_ex_bank= ExerciseBank.new ex_params
            current_ex_bank.save!  #如果习题库保存成功，则会创建问题库question_bank
            # if current_ex_bank.save
            #   ques_params = {
            #       :name => current_ex_bank.name,
            #       :container_id => current_ex_bank.id,
            #       :container_type => current_ex_bank.container_type,
            #       :quotes => current_ex_bank.quotes,
            #       :user_id => current_ex_bank.user_id,
            #       :is_public => current_ex_bank.is_public,
            #       :course_list_id => current_ex_bank.course_list_id
            #   }
            #   question_bank = QuestionBank.new ques_params
            #   question_bank.save
            # end
          end
          # 试卷的问题的输入
          exercise.exercise_questions.each do |q|
            option = {
                :question_title => q.question_title,
                :question_type => q.question_type,
                :question_number => q.question_number,
                :question_score => q.question_score,
                :shixun_id => q.shixun_id,
                :shixun_name => q.shixun_name
            }
            exercise_bank_question = current_ex_bank.exercise_bank_questions.new option
            exercise_bank_question.save
            ## 试卷选项的输入
            if q.question_type != Exercise::PRACTICAL  #不为实训题时,试卷选项加入试题答案库
              ex_choices = q.exercise_choices
              ex_standard = q.exercise_standard_answers
              ex_choices.each do |c|
                choice_option = {
                    :choice_position => c.choice_position,
                    :choice_text =>c.choice_text
                }
                ex_bank_choice = exercise_bank_question.exercise_bank_choices.new choice_option
                ex_bank_choice.save
              end
              ex_standard.each do |s|
                ex_stand = {
                    :exercise_bank_choice_id => s.exercise_choice_id,
                    :answer_text => s.answer_text
                }
                ex_stand_bank = exercise_bank_question.exercise_bank_standard_answers.new ex_stand
                ex_stand_bank.save
              end
            else  #当为实训题时
              shixun_challenges = q.exercise_shixun_challenges
              shixun_challenges.each do |c|
                challenge_option = {
                    :position => c.position,
                    :challenge_id => c.challenge_id,
                    :shixun_id => q.shixun_id,
                    :question_score => c.question_score
                }
                shixun_challenge_bank = exercise_bank_question.exercise_bank_shixun_challenges.new challenge_option
                shixun_challenge_bank.save
              end
            end
          end
          current_ex_bank.save
        end
        normal_status(0, "题库更新成功！")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("题库更新失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #试卷的设置页面
  def exercise_setting
    ActiveRecord::Base.transaction do
      begin
        @user_permission = 2
        @user_course_groups = @course.teacher_group(current_user.id)    #当前老师的分班
        @being_setting_course_ids = @exercise.common_published_ids(current_user.id)   #当前用户已发布的班级的id
        @user_published_setting = @exercise.exercise_group_settings
                                      .find_in_exercise_group("course_group_id",@being_setting_course_ids)  #当前用户已发布班级的试卷设置
        exercise_ids = [@exercise.id]
        @exercise_publish_count = get_user_permission_course(exercise_ids,Exercise::PUBLISHED).count  #判断当前用户是否有试卷已发布的分班，用于显示立即截止/撤销发布
        @exercise_unpublish_count = get_user_permission_course(exercise_ids,Exercise::UNPUBLISHED).count  #判断当前用户是否有试卷未发布的分班，用户显示立即发布
        @exercise_users_count = @exercise.exercise_users.commit_exercise_by_status(1).count #判断当前试卷是否有已提交的
          # ## 需添加发送消息的接口，稍后添加
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("页面调用失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #试卷的提交设置
  def commit_setting
    ActiveRecord::Base.transaction do
      begin
        error_count = 0   # 判断循环里是否有已发布/已截止的，且时间更改了的分班。
        # course_group_ids = @course.teacher_course_group_ids(current_user.id)  #当前老师的班级id数组
        course_group_ids = @course.charge_group_ids(current_user)  #当前老师的班级id数组

        exercise_status = @exercise.get_exercise_status(current_user)

        if exercise_status == Exercise::UNPUBLISHED && course_group_ids.size > 0 # 试卷未发布，且老师的分班大于1 ，才可以修改统一设置，否则按试卷默认的来处理
          unified_setting = params[:unified_setting]
        else
          unified_setting = @exercise.unified_setting
        end

        show_statistic = params[:show_statistic] ? true :false
        exercise_time = params[:time].blank? ? -1 : params[:time]
        question_random = params[:question_random] ? true :false  #问题是否随机，0为不随机，1为随机
        choice_random = params[:choice_random] ? true :false
        score_open = params[:score_open] ? true : false  #分数是否公开
        answer_open = params[:answer_open] ? true : false  #答案是否公开

        # 统一设置或者分班为0，则更新试卷，并删除试卷分组
        if unified_setting || (course_group_ids.size == 0)
          params_publish_time = params[:publish_time].blank? ? nil : params[:publish_time].to_time
          params_end_time = nil
          if params[:end_time].blank?
            if params_publish_time.present?
              params_end_time = params_publish_time + 30.days
            end
          else
            params_end_time = params[:end_time].to_time
          end

          if (exercise_status != Exercise::UNPUBLISHED) && (@exercise.publish_time != params_publish_time)
            normal_status(-1,"已发布/已截止,不允许修改发布时间")
          elsif params_publish_time.present? && params_end_time.present? && params_end_time < params_publish_time
            normal_status(-1,"截止时间不能小于发布时间")
          else
            #发布时间小于当前时间，则试卷显示为未发布,当截止时间大于当前时间，则显示为已截止
            exercise_status_n = set_exercise_status(params_publish_time,params_end_time)
            exercise_params = {
                :unified_setting => unified_setting,
                :show_statistic => show_statistic,
                :time => exercise_time,
                :question_random => question_random,
                :choice_random => choice_random,
                :score_open => score_open,
                :answer_open => answer_open,
                :exercise_status => exercise_status_n,
                :publish_time => params_publish_time,
                :end_time => params_end_time
            }
            @exercise.update_attributes(exercise_params)
            @exercise.exercise_group_settings.destroy_all
            normal_status(0, "试卷设置成功！")
          end
        else
          params_times = params[:publish_time_groups]   #分班返回的json数组{"publish_time_groups":[{"course_group_id":"1","publish_time":"xx","end_time":"xxx"}]}
          exercise_groups = @exercise.exercise_group_settings.find_in_exercise_group("course_id",@course.id)    #试卷的全部分班信息
          exercise_groups_ids = exercise_groups.pluck(:course_group_id)   #问卷的全部分班id
          total_common = params_times.map{|k| k[:course_group_id]}.sum.uniq  #传入的所有分组的分班id
          total_common_group = exercise_groups_ids & total_common   #传入的分班与问卷已存在的分班的交集
          old_exercise_groups = exercise_groups_ids - total_common_group #后来传入的分班里，没有了的班级，即需要删除

          params_times.each do |t|
            course_id = t[:course_group_id]
            exercise_publish_time = t[:publish_time].present? ? t[:publish_time].to_time : nil
            exercise_end_time = nil
            if t[:end_time].blank?
              if exercise_publish_time.present?
                exercise_end_time = exercise_publish_time + 30.days
              end
            else
              exercise_end_time = t[:end_time].to_time
            end
            exercise_group = exercise_groups.find_in_exercise_group("course_group_id",course_id)  #判断该分班是否存在
            if exercise_group.present? && (exercise_group.first.publish_time < Time.now) && (exercise_publish_time != exercise_group.first.publish_time)
              error_count += 1
            end
            if error_count == 0
              common_group = exercise_groups_ids & course_id #传入的班级与问卷已存在的班级的交集，即表示已有分班的
              new_group_ids = course_id - common_group  #新传入的班级id
              if common_group.count > 0  #判断试卷的分班设置是否存在，存在则更新，负责则新建
                ex_group_params = {
                    :publish_time => exercise_publish_time,
                    :end_time => exercise_end_time
                }
                exercise_group_sets = exercise_groups.find_in_exercise_group("course_group_id",common_group)
                the_group_setting = exercise_group_sets.first
                if the_group_setting.present?
                  the_group_setting_status = set_exercise_status(the_group_setting.publish_time,the_group_setting.end_time)
                  if the_group_setting_status == 2
                    ex_group_params = {
                        :publish_time => the_group_setting.publish_time,
                        :end_time => exercise_end_time
                    }
                  elsif the_group_setting_status == 3
                    ex_group_params = {
                        :publish_time => the_group_setting.publish_time,
                        :end_time => the_group_setting.end_time
                    }
                  end
                end
                exercise_group_sets.update_all(ex_group_params)
              end
              if new_group_ids.size > 0
                new_group_ids.each do |c|
                  exercise_group_params = {
                      :exercise_id => @exercise.id,
                      :course_group_id => c,
                      :course_id => @course.id,
                      :publish_time => exercise_publish_time,
                      :end_time => exercise_end_time
                  }
                  new_exercise_group = ExerciseGroupSetting.new(exercise_group_params)
                  new_exercise_group.save
                end
              end
            end
          end

          if error_count > 0
            error_count == 0
            normal_status(-1,"已发布/已截止的试卷不允许修改时间")
          else
            if old_exercise_groups.size > 0
              old_all_ex_groups = exercise_groups.find_in_exercise_group("course_group_id",old_exercise_groups)
              old_all_ex_groups.destroy_all
            end
            #试卷更新为exercise_group_setting的发布时间最小，截止时间最大
            e_time_present = exercise_groups.end_time_no_null.map(&:end_time)
            p_time_present = exercise_groups.publish_time_no_null.map(&:publish_time)
            e_time = e_time_present.size > 0 ? e_time_present.max : nil
            p_time = p_time_present.size > 0 ? p_time_present.min : nil
            exercise_status = 1
            if p_time.nil?  #发布时间为空，则表示问卷未发布
              exercise_status = 1
            elsif p_time.present? && e_time.present?
              exercise_status = set_exercise_status(p_time,e_time)
            end
            exercise_params = {
                :unified_setting => unified_setting,
                :show_statistic => show_statistic,
                :time => exercise_time,
                :question_random => question_random,
                :choice_random => choice_random,
                :score_open => score_open,
                :answer_open => answer_open,
                :exercise_status => exercise_status,
                :publish_time => p_time,
                :end_time => e_time
            }
            @exercise.update_attributes(exercise_params)
            if @exercise.exercise_status == Exercise::PUBLISHED
              if @exercise.course_acts.size == 0
                @exercise.course_acts << CourseActivity.new(:user_id => @exercise.user_id,:course_id => @exercise.course_id)
              end
            end
            normal_status(0, "试卷设置成功！")
          end
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("提交出现错误！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #我的题库
  def my_exercises
    ActiveRecord::Base.transaction do
      begin
        ## 我的试卷题库
        @current_user_exercises = current_user.exercise_banks.find_by_c_type("Exercise")
        if @current_user_exercises.present?

          if params[:search].present?
            search_type = params[:search].to_s.strip
            @current_user_exercises = @current_user_exercises.exercise_bank_search(search_type)
          end
          page  = params[:page]  || 1
          limit = params[:limit] || 15
          @my_exercises_count = @current_user_exercises.size
          @current_user_exercises = @current_user_exercises.page(page).per(limit)
        else
          @current_user_exercises = []
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("页面调用失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  # 公共题库
  def public_exercises
    ActiveRecord::Base.transaction do
      begin
        if current_user.is_certification_teacher
          @user_certification = 1  #用户已通过认证
          @public_exercises = ExerciseBank.find_by_c_type("Exercise").public_exercises
          if @public_exercises.present?
            if params[:search].present?
              search_type = params[:search].to_s.strip
              @public_exercises = @public_exercises.exercise_bank_search(search_type)
            end
            page  = params[:page]  || 1
            limit = params[:limit] || 15
            @public_exercises_count = @public_exercises.size
            @public_exercises = @public_exercises.page(page).per(limit)
          else
            @public_exercises_count = 0
            @public_exercises = []
          end
        else
          @user_certification = 0  #用户未通过认证
          @public_exercises_count = 0
          @public_exercises = []
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("题库调用失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #立即发布的弹窗内容
  def publish_modal

    ActiveRecord::Base.transaction do
      begin
        exercise_ids = params[:check_ids]
        if exercise_ids.count > 0
          @course_groups = get_user_permission_course(exercise_ids,1)
        else
          @course_groups = []
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("没有权限")
        raise ActiveRecord::Rollback
      end
    end
  end

  #首页批量或单独 立即发布,应是跳出弹窗，设置开始时间和截止时间。
  def publish
    tip_exception("缺少截止时间参数") if params[:end_time].blank?
    tip_exception("截止时间不能早于当前时间") if params[:end_time] <= strf_time(Time.now)
    tip_exception("截止时间不能晚于课堂结束时间") if @course.end_date.present? && params[:end_time] > strf_time(@course.end_date.end_of_day)
    ActiveRecord::Base.transaction do
      begin
        check_ids = Exercise.where(id: params[:check_ids])
        ex_end_time = params[:end_time].blank? ? Time.at(((1.month.since.to_i)/3600.0).ceil * 3600) : params[:end_time].to_time
        check_ids.each do |exercise|
          if exercise.present?
            if exercise.unified_setting
              ex_status = exercise.exercise_status   #则为试卷的状态
            else
              ex_status = exercise.exercise_group_settings.find_in_exercise_group("course_group_id",params[:group_ids])
                              .exercise_group_not_published.present? ? 1 : 0
            end
            if ex_status == 1  #如果试卷存在已发布的，或者是已截止的，那么则直接跳过
              g_course = params[:group_ids]  #表示是否传入分班参数,如果传入分班的参数，那么试卷的统一设置需修改
              if g_course
                user_course_groups = @course.charge_group_ids(current_user)
                if g_course.map(&:to_i).sort == user_course_groups.sort   # 如果是设置为全部班级，则试卷不用分组，且试卷设定为统一设置,否则则分组设置
                  exercise.exercise_group_settings.destroy_all
                  ex_unified = true
                  e_time = ex_end_time
                else
                  ex_unified = false
                  g_course.each do |i|
                    exercise_group_setting = exercise.exercise_group_settings.find_in_exercise_group("course_group_id",i).first  #根据课堂分班的id，寻找试卷所在的班级
                    if exercise_group_setting   #如果该试卷分组存在，则更新，否则新建
                      exercise_group_setting.update_attributes(publish_time:Time.now,end_time:ex_end_time)
                    else
                      p_course_group = {
                          :exercise_id => exercise.id,
                          :course_group_id => i,
                          :course_id => exercise.course.id,
                          :publish_time => Time.now,
                          :end_time => ex_end_time,
                      }
                      new_exercise_group = exercise.exercise_group_settings.new p_course_group
                      new_exercise_group.save
                    end
                  end
                  # group_ids = params[:group_ids]
                  e_time = exercise.exercise_group_settings.end_time_no_null.map(&:end_time).max
                end
              else
                exercise.exercise_group_settings.destroy_all
                ex_unified = true
                e_time = ex_end_time
              end

              ex_status = set_exercise_status(Time.now,e_time)
              exercise_params = {
                  :publish_time => Time.now,
                  :end_time => e_time,
                  :exercise_status => ex_status,
                  :unified_setting => ex_unified
              }
              exercise.update_attributes(exercise_params)

              if exercise.course_acts.size == 0
                exercise.course_acts << CourseActivity.new(:user_id => exercise.user_id,:course_id => exercise.course_id)
              end
              ExercisePublishNotifyJob.perform_later(exercise.id, g_course)
            end
          end
        end
        normal_status(0, "试卷发布成功！")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷发布失败")
        raise ActiveRecord::Rollback
      end
    end
  end

  #立即截止的弹窗内容
  def end_modal
    ActiveRecord::Base.transaction do
      begin
        exercise_ids = params[:check_ids]
        if exercise_ids.count > 0
          @course_groups = get_user_permission_course(exercise_ids,3)
        else
          @course_groups = []
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("没有权限")
        raise ActiveRecord::Rollback
      end
    end
  end

  # 首页批量或单独 立即截止，截止时间为当前时间
  def end_exercise
    ActiveRecord::Base.transaction do
      begin
        check_ids = Exercise.where(id:params[:check_ids])
        course_students = @course.students #课堂的全部学生数
        check_ids.each do |exercise|
          exercise_status= exercise.get_exercise_status(current_user)
          if exercise_status == Exercise::PUBLISHED  #跳过已截止的或未发布的
            g_course = params[:group_ids]
            if g_course.present?
              teacher_course_group_ids = @course.charge_group_ids(current_user)
              if g_course.map(&:to_i).sort == teacher_course_group_ids.sort  #开始为统一设置
                exercise.exercise_group_settings.destroy_all
                new_ex_status = set_exercise_status(exercise.publish_time,Time.now)
                exercise.update_attributes(:end_time => Time.now,:unified_setting => true,:exercise_status => new_ex_status)
                exercise_users = exercise.exercise_users
              else
                course_members_ids = course_students.course_find_by_ids("course_group_id",g_course).pluck(:user_id).uniq #该班级的全部学生
                exercise_users = exercise.exercise_users.exercise_commit_users(course_members_ids)  #参与答题的学生数
                ex_group_setting = exercise.exercise_group_settings
                old_exercise_groups = ex_group_setting.find_in_exercise_group("course_group_id",g_course)  #试卷的分组设置
                left_course_groups = teacher_course_group_ids - g_course
                left_exercise_groups = ex_group_setting.find_in_exercise_group("course_group_id",left_course_groups)
                if left_exercise_groups.blank? && exercise.unified_setting
                  if left_course_groups.size > 0   #开始为统一设置，但是立即截止为分班。则创建没有立即截止的班级的exercise_group_setting
                    left_course_groups.each do |g|
                      ex_group_options = {
                          :exercise_id => exercise.id,
                          :course_group_id => g,
                          :course_id => @course.id,
                          :publish_time => exercise.publish_time,
                          :end_time => exercise.end_time
                      }
                      ExerciseGroupSetting.create(ex_group_options)
                    end
                  end
                end
                if old_exercise_groups.present?
                  old_exercise_groups.update_all(:end_time => Time.now)
                else
                  g_course.each do |g|
                    ex_group_options = {
                        :exercise_id => exercise.id,
                        :course_group_id => g,
                        :course_id => @course.id,
                        :publish_time => exercise.publish_time,
                        :end_time => Time.now
                    }
                    ExerciseGroupSetting.create(ex_group_options)
                  end
                end
                new_end_time = exercise.exercise_group_settings.end_time_no_null.map(&:end_time)   # 试卷结束时间不为空的
                new_end_time_s = new_end_time.count > 0 ? new_end_time.max : Time.now
                new_ex_status = set_exercise_status(exercise.publish_time,new_end_time_s)
                exercise.update_attributes(:end_time => new_end_time_s,:exercise_status => new_ex_status,:unified_setting => false)
              end
            else
              exercise_users = exercise.exercise_users
              exercise.update_attributes(:exercise_status => 3, :end_time => Time.now,:unified_setting => true)
            end
            exercise_users.each do |user|
              if user.commit_status == 0 && user.start_at.present?
                objective_score = calculate_student_score(exercise,user.user)[:total_score]
                user_sub_score = user.subjective_score
                subjective_score = user_sub_score < 0.0 ? 0.0 : user_sub_score
                total_score = objective_score + subjective_score
                commit_option = {
                    :status => 1,
                    :commit_status => 1,
                    :end_at => Time.now,
                    :objective_score => objective_score,
                    :score => total_score,
                    :subjective_score => user_sub_score
                }
                user.update_attributes(commit_option)
              end
            end
          end
        end
        normal_status(0, "试卷截止成功！")
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("立即截止失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #学生撤销回答
  def cancel_exercise
    ActiveRecord::Base.transaction do
      begin
        ex_question_ids = @exercise.exercise_questions.pluck(:id)
        exercise_user = @exercise.exercise_users.exercise_commit_users(current_user.id).first
        if exercise_user.present?
          if exercise_user.commit_status == 1 && @exercise.get_exercise_status(current_user) == Exercise::PUBLISHED  #用户已提交且试卷提交中
            if @exercise.time == -1 || ((Time.now.to_i - exercise_user.start_at.to_i) < @exercise.time.to_i * 60)
              exercise_user.update_attributes(:score => nil, :end_at => nil, :status => nil, :commit_status => 0,
                                              :objective_score => 0.0, :subjective_score => -1.0)
              exercise_user.user.exercise_shixun_answers.search_shixun_answers("exercise_question_id",ex_question_ids).destroy_all
              exercise_answers = exercise_user.user.exercise_answers.search_answer_users("exercise_question_id",ex_question_ids)
              exercise_answers.update_all(:score => -1.0)
              all_answer_comment = ExerciseAnswerComment.search_answer_comments("exercise_question_id",ex_question_ids)
                                       .search_answer_comments("exercise_answer_id",exercise_answers.pluck(:id))
              all_answer_comment.destroy_all
              normal_status(0,"撤销回答成功")
            else
              normal_status(-1,"用户答题时间已到")
            end
          else
            normal_status(-1,"用户未提交/试卷不是提交中")
          end
        else
          normal_status(-1,"当前用户未答题")
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("页面调用失败")
        raise ActiveRecord::Rollback
      end
    end
  end

  #打回重做modal
  def redo_modal
    ActiveRecord::Base.transaction do
      begin
        #搜索
        if params[:realname].present?
          search_name = params[:realname]
          #搜索用户的nickname,如果存在则返回，否则继续查询用户的真实姓名或学生号
          @exercise_users = @exercise_users.includes(:user).where("LOWER(concat(users.lastname, users.firstname)) like ?",
                                                                  "%#{search_name}%")
        end
        if params[:student_id].present?
          search_st_id = params[:student_id].to_i
          @exercise_users = @exercise_users.includes(user: [:user_extension])
                                .where('user_extensions.student_id like ?',"%#{search_st_id}%")
        end
        sort = params[:sort] ? params[:sort] : "asc"
        @exercise_users = @exercise_users.order("score #{sort}")
        @exercise_users_size = @exercise_users.size
        # 分页
        page  = params[:page]  || 1
        limit = params[:limit] || 15
        @exercise_users = @exercise_users.page(page).per(limit)
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("没有权限")
        raise ActiveRecord::Rollback
      end
    end
  end

  #打回重做确认
  def redo_exercise
    ActiveRecord::Base.transaction do
      begin
        user_ids = params[:user_ids]
        if user_ids.present?
          redo_option = {
              :score => 0.0,
              :start_at => nil,
              :end_at => nil,
              :status => nil,
              :commit_status => 0,
              :objective_score => 0.0,
              :subjective_score => -1.0
          }
          redo_exercise_users = @exercise_users.exercise_commit_users(user_ids)
          redo_exercise_users.update_all(redo_option)
          exercise_question_ids = @exercise.exercise_questions.pluck(:id).uniq
          ExerciseAnswer.search_answer_users("user_id",user_ids)
              .search_answer_users("exercise_question_id",exercise_question_ids).destroy_all
          ExerciseShixunAnswer.search_shixun_answers("user_id",user_ids)
              .search_shixun_answers("exercise_question_id",exercise_question_ids).destroy_all

          normal_status(0,"已成功打回重做！")
        else
          normal_status(-1,"请选择学生！")
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("没有权限")
        raise ActiveRecord::Rollback
      end
    end
  end

  #学生开始答题页面
  def start_answer
    ActiveRecord::Base.transaction do
      begin
        ex_users_current = ExerciseUser.where(user_id:@exercise_current_user_id,exercise_id:@exercise.id)   #不能用@exercise.exercise_users，因为exercise_users删除时，只是状态改变，未删除
        @exercise_user_current = ex_users_current&.first
        if ex_users_current.exists?
          if @exercise_user_current.start_at.blank?
            @exercise_user_current.update_attribute("start_at",Time.now)
          end
        else
          if @user_course_identity > Course::ASSISTANT_PROFESSOR  #当为老师的时候，不创建exercise_user表，理论上老师是不能进入答题的
            exercise_user_params = {
                :user_id => @exercise_current_user_id,
                :exercise_id => @exercise.id,
                :start_at => Time.now
            }
            exercise_user_current = ExerciseUser.new(exercise_user_params)
            exercise_user_current.save
          end
        end
        @t_user_exercise_status = @exercise.get_exercise_status(current_user)

        @user_left_time = nil
        if @user_course_identity < Course::STUDENT || (@t_user_exercise_status == 3) ||
            (ex_users_current.exists? && @exercise_user_current.commit_status == 1)
          @user_exercise_status = 1  #当前用户为老师/试卷已截止/试卷已提交不可编辑
        else
          @user_left_time = get_exercise_left_time(@exercise,current_user)
          @user_exercise_status = 0  #可编辑
        end

        @exercise_questions = @exercise.exercise_questions

        if @exercise.question_random
          @exercise_questions = @exercise_questions.order("RAND()")
        else
          @exercise_questions = @exercise_questions.order("question_number ASC")
        end
        # 判断问题是否已回答还是未回答
        @exercise_questions = @exercise_questions.includes(:exercise_shixun_challenges,
                                                           :exercise_shixun_answers,
                                                           :exercise_answers,
                                                           :exercise_standard_answers)

        if @t_user_exercise_status == Exercise::DEADLINE
          get_each_student_exercise(@exercise.id,@exercise_questions,@exercise_current_user_id)
        end
        get_user_answer_status(@exercise_questions,@exercise_current_user_id,@exercise,@t_user_exercise_status)

      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("页面调用失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #提交试卷前的弹窗
  def begin_commit
    ActiveRecord::Base.transaction do
      begin
        if @user_course_identity > Course::ASSISTANT_PROFESSOR   #为学生时
          @exercise_questions = @exercise.exercise_questions
          @shixun_undo = 0
          @ques_undo = 0
          ex_answer_time = @exercise.time.to_i
          @ex_end_time = @exercise.get_exercise_end_time(current_user.id)
          if ex_answer_time > 0
            exercise_end_time = @exercise.exercise_users.exercise_commit_users(current_user.id)
            if exercise_end_time.present?
              ex_end_times =  exercise_end_time.first.start_at.nil? ? Time.now : exercise_end_time.first.start_at
              @ex_end_time = ex_end_times + ex_answer_time.minutes
            end
          end
          @exercise_questions.each do |q|
            if q.question_type == Exercise::PRACTICAL  #当为实训题时
              user_myshixun = q.shixun.myshixuns.search_myshixun_user(current_user.id)
              if user_myshixun.blank? || user_myshixun.first.status != Exercise::UNPUBLISHED   #当前用户的实训是否做完
                @shixun_undo += 1
              end
            else
              ques_vote = q.exercise_answers.search_exercise_answer("user_id",current_user.id)
              if ques_vote.blank?
                @ques_undo += 1
              end
            end
          end
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷提交失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  # 学生提交试卷
  def commit_exercise
    ActiveRecord::Base.transaction do
      begin
        if @user_course_identity > Course::ASSISTANT_PROFESSOR   #为学生时
          objective_score = calculate_student_score(@exercise,current_user)[:total_score]
          subjective_score = @answer_committed_user.subjective_score
          total_score_subjective_score = subjective_score < 0.0 ? 0.0 : subjective_score
          total_score = objective_score + total_score_subjective_score
          commit_option = {
              :status => 1,
              :commit_status => 1,
              :end_at => Time.now,
              :objective_score => objective_score,
              :score => total_score,
              :subjective_score => subjective_score
          }
          @answer_committed_user.update_attributes(commit_option)
          normal_status(0,"试卷提交成功！")
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("试卷提交失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #教师评阅试卷 及学生查看试卷
  def review_exercise
    ActiveRecord::Base.transaction do
      begin
        # 1 老师权限，0 学生权限
        @is_teacher_or = (@user_course_identity < Course::STUDENT) ? 1 : 0
        @student_status = 2
        @exercise_questions = @exercise.exercise_questions.includes(:exercise_shixun_challenges,:exercise_standard_answers,:exercise_answers,:exercise_shixun_answers).order("question_number ASC")
        @question_status = []
        get_exercise_status = @exercise.get_exercise_status(current_user)  #当前用户的试卷状态
        @ex_answer_status = @exercise.get_exercise_status(@ex_user&.user)  #当前试卷用户的试卷状态
        if @ex_user.present? && @is_teacher_or == 0
          if get_exercise_status == Exercise::PUBLISHED  #当前用户已提交，且试卷未截止
            if @ex_user.commit_status == 0   #学生未提交，且当前为学生
              @student_status = 0
            else
              @student_status = 1
              get_user_answer_status(@exercise_questions,@exercise_current_user_id,@exercise,get_exercise_status)
            end
          end
        end
        if @student_status == 2
          get_each_student_exercise(@exercise.id,@exercise_questions,@exercise_current_user_id)
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("没有权限")
        raise ActiveRecord::Rollback
      end
    end
  end

  #答题列表
  def exercise_lists
    ActiveRecord::Base.transaction do
      begin
        @current_user_id = current_user.id
        exercise_ids = [@exercise.id]
        @exercise_status = @exercise.get_exercise_status(current_user)
        @course_all_members = @course.students
        @c_group_counts = @course.course_groups_count
        question_types = @exercise.exercise_questions.pluck(:question_type).uniq
        @exercise_publish_count = get_user_permission_course(exercise_ids,Exercise::PUBLISHED).count #判断是否有已发布的分班
        @exercise_unpublish_count = get_user_permission_course(exercise_ids,Exercise::UNPUBLISHED).count  #判断是否有未发布的分班

        if (question_types.size > 1) &&  question_types.include?(Exercise::SUBJECTIVE)   #是否包含主观题,或者是否大于1
          @subjective_type = 1
        else
          @subjective_type = 0
        end

        #初始化值
        @exercise_users_list = []   #答题用户列表
        @exercise_course_groups = []  #当前用户有权限的班级
        @exercise_unanswers = 0   # 未答用户数
        @exercise_answers = 0     #已答用户数
        @exercise_users_count = 0  #全部用户数
        @teacher_review_count = 0  #已评数
        @teacher_unreview_count = 0  #未评数

        #试卷的答题列表页的显示用户
        if @user_course_identity < Course::STUDENT  #当前为老师，而且老师只能查看自己班级的/课堂的试卷
          @exercise_current_user_status = 0
          unless @exercise_status == Exercise::UNPUBLISHED
            ex_common_ids = @exercise.common_published_ids(current_user.id)
            @exercise_course_groups = @course.get_ex_published_course(ex_common_ids)
            @exercise_users_list = @exercise.all_exercise_users(current_user.id)  #当前老师所在班级的全部学生
            get_exercise_answers(@exercise_users_list, @exercise_status)
          end
        else   #当前为学生或者有过答题的
          @ex_user_end_time = @exercise.get_exercise_end_time(current_user.id)   #当前用户所看到的剩余时间
          @exercise_all_users = @exercise.get_stu_exercise_users
          get_exercise_answers(@exercise_all_users, @exercise_status)  # 未答和已答的
          exercise_current_user = @exercise_all_users.exercise_commit_users(current_user.id)
          if exercise_current_user.exists?  #表示为课堂学生或已回答的
            @exercise_current_user_status = 1
            if @exercise.score_open && @exercise_status == Exercise::DEADLINE  #勾选了成绩公开且试卷已截止的
              all_user_ids = @exercise_all_users.pluck(:user_id)
              all_user_ids.delete(current_user.id)  #删除了当前用户的ID
              @exercise_users_list = @exercise_all_users.exercise_commit_users(all_user_ids).distinct
              @current_user_ex_answers = exercise_current_user  #当前用户的回答
            else
              @exercise_users_list = exercise_current_user
            end
          else  #表示为未回答的，或未非课堂成员的
            @exercise_current_user_status = 2  #当前用户非课堂成员
          end
        end

        if @exercise_unanswers < 0
          @exercise_unanswers = 0
        end

        #筛选/分类,排序
        order = params[:order]
        if @exercise_users_list.present? && @exercise_users_list.size > 0
          @exercise_users_count = @exercise_users_list.size    #当前显示的全部成员数量
          teacher_reviews = @exercise_users_list.exercise_review
          teacher_unreviews = @exercise_users_list.exercise_unreview
          @teacher_review_count = teacher_reviews.size  #已评阅
          @teacher_unreview_count = teacher_unreviews.size  #未评阅

          #是否评阅
          if params[:review].present?
            review_type = params[:review].first.to_i  #已评，则数据为1，未评，则数据为0,前端传过来的为数组
            if review_type == 1
              @exercise_users_list = teacher_reviews
            else
              @exercise_users_list = teacher_unreviews
            end
          end

          #答题状态的选择
          if params[:commit_status].present?
            choose_type = params[:commit_status]
            @exercise_users_list =  @exercise_users_list.commit_exercise_by_status(choose_type)
          end

          #班级的选择
          if params[:exercise_group_id].present?
            group_id = params[:exercise_group_id]
            exercise_students = @course_all_members.course_find_by_ids("course_group_id",group_id)  #试卷所分班的全部人数
            user_ids = exercise_students.pluck(:user_id).reject(&:blank?)
            @exercise_users_list = @exercise_users_list.exercise_commit_users(user_ids)
          end

          #搜索
          if params[:search].present?
            @exercise_users_list = @exercise_users_list.joins(user: :user_extension).where("CONCAT(lastname, firstname) like ? OR student_id like ?", "%#{params[:search]}%", "%#{params[:search]}%")
          end

          exercise_user_joins = @exercise_users_list.joins(user: :user_extension)

          if order == "student_id"
            @exercise_users_list = exercise_user_joins.order("user_extensions.student_id DESC")
          elsif order == "score"
            @exercise_users_list = exercise_user_joins.order("#{order} DESC")
          else
            @exercise_users_list = exercise_user_joins.order("end_at DESC, start_at DESC")
          end

          @export_ex_users = @exercise_users_list

          @exercise_users_size = @exercise_users_list.size

          # 分页
          @page  = params[:page]  || 1
          @limit = params[:limit] || 20
          @exercise_users_list = @exercise_users_list.page(@page).per(@limit)
        else
          @exercise_users_list = []
          @export_ex_users = @exercise_users_list
          @exercise_users_size = 0
        end

        if params[:format] == "xlsx"
          if @user_course_identity > Course::ASSISTANT_PROFESSOR
            tip_exception(403,"无权限操作")
          elsif @exercise_status == Exercise::UNPUBLISHED
            normal_status(-1,"试卷未发布")
          elsif (@exercise_users_size == 0) || ( @export_ex_users&.exercise_user_committed.size == 0)
            normal_status(-1,"暂无用户提交")
          else
            respond_to do |format|
              format.xlsx{
                get_export_users(@exercise,@course,@export_ex_users)
                exercise_export_name_ =
                    "#{current_user.real_name}_#{@course.name}_#{@exercise.exercise_name}_#{Time.now.strftime('%Y%m%d_%H%M%S')}"
                render xlsx: "#{exercise_export_name_.strip}",template: "exercises/exercise_lists.xlsx.axlsx",locals: {table_columns:@table_columns,exercise_users:@user_columns}
              }
            end
          end
        end
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("页面调用失败！")
        raise ActiveRecord::Rollback
      end
    end
  end

  #导出空白试卷
  def export_exercise
    @request_url = request.base_url
    @exercise_questions = @exercise.exercise_questions.includes(:exercise_choices).order("question_number ASC")
    filename_ = "#{@exercise.user.real_name}_#{@course.name}_#{Time.now.strftime('%Y%m%d_%H%M%S')}.pdf"
    stylesheets = "#{Rails.root}/app/templates/exercise_export/exercise_export.css"
    render pdf: 'exercise_export/blank_exercise', filename: filename_, stylesheets: stylesheets
  end

  #空白试卷预览页面,仅供测试使用，无其他任何用途
  # def blank_exercise
  #   ActiveRecord::Base.transaction do
  #     begin
  #       @exercise_questions = @exercise.exercise_questions.order("question_number ASC")
  #       challenge_ids = @exercise_questions.joins(:exercise_shixun_challenges).pluck("exercise_shixun_challenges.challenge_id")
  #       get_each_student_exercise(@exercise.id,@exercise_questions,31798)
  #       @games = @exercise_user.user.games.ch_games(challenge_ids)
  #       respond_to do |format|
  #         format.html
  #       end
  #     rescue Exception => e
  #       uid_logger_error(e.message)
  #       tip_exception("没有权限")
  #       raise ActiveRecord::Rollback
  #     end
  #   end
  # end

  #学生的统计结果
  def exercise_result
    ActiveRecord::Base.transaction do
      begin
        exercise_ids = [@exercise.id]
        @exercise_publish_count = get_user_permission_course(exercise_ids,Exercise::PUBLISHED).size #判断是否有已发布的分班
        @exercise_unpublish_count = get_user_permission_course(exercise_ids,Exercise::UNPUBLISHED).size  #判断是否有未发布的分班
        @course_all_members = @course.students  #课堂的全部学生
        @exercise_all_users = @exercise.exercise_users
        ex_common_ids = @exercise.common_published_ids(current_user.id)
        @exercise_course_groups = @course.get_ex_published_course(ex_common_ids)

        #班级的选择
        if params[:exercise_group_id].present?
          group_id = params[:exercise_group_id]
          exercise_students = @course_all_members.course_find_by_ids("course_group_id",group_id)  # 试卷所分班的全部人数
          user_ids = exercise_students.pluck(:user_id).reject(&:blank?)
          @exercise_all_users = @exercise.exercise_users.exercise_commit_users(user_ids)
          @course_all_members_count = @exercise_all_users.size
        else
          @exercise_users_list = @exercise.all_exercise_users(current_user.id)
          @course_all_members_count = @exercise_users_list.size
        end
        @exercise_commit_users = @exercise_all_users.commit_exercise_by_status(1)   #试卷的已提交用户
        @exercise_commit_user_ids = @exercise_commit_users.pluck(:user_id).uniq  #已提交试卷的全部用户id
        @exercise_commit_user_counts = @exercise_commit_users.size   #试卷的已提交用户人数
        @exercise_status = @exercise.get_exercise_status(current_user)

        #提交率
        if @course_all_members_count == 0
          commit_percent = 0.00
          min_score = 0.0
          max_score = 0.0
          average_score = 0.0
          fail_counts = 0
          pass_counts = 0
          good_counts = 0
          best_counts = 0
        else
          commit_percent = (@exercise_commit_user_counts / @course_all_members_count.to_f).round(3)
          exercise_scores = @exercise_commit_users.pluck(:score).reject(&:blank?)
          min_score = exercise_scores.min.present? ? exercise_scores.min : 0.0
          max_score = exercise_scores.max.present? ? exercise_scores.max : 0.0
          total_score = exercise_scores.sum.present? ? exercise_scores.sum : 0.0
          average_score = @exercise_commit_user_counts > 0 ? (total_score / @exercise_commit_user_counts).round(1) : 0.0
          fail_counts = exercise_scores.count{|a| a < 60.0}
          pass_counts = exercise_scores.count{|a| a < 70.0 && a >= 60.0}
          good_counts = exercise_scores.count{|a| a < 90.0 && a >= 70.0}
          best_counts = exercise_scores.count{|a| a >= 90.0 && a <= 100.0}
        end
        @counts_array = {
            :commit_percent => commit_percent,
            :min_score => min_score.to_s,
            :max_score => max_score.to_s,
            :average_score => average_score.to_s,
            :fail_counts => fail_counts,
            :pass_counts => pass_counts,
            :good_counts => good_counts,
            :best_counts => best_counts,
        }

        @exercise_questions = @exercise.exercise_questions&.includes(:exercise_choices,:exercise_answers,:exercise_standard_answers,:exercise_shixun_challenges,:exercise_shixun_answers)

        @paging_type = "percent"
        # 按题型排序
        if params[:sort].present?
          @paging_type = params[:sort].to_s
        end

        ques_result_all = exercise_commit_result(@exercise_questions,@exercise_commit_user_ids)

        if @paging_type == "percent"
          @question_result_hash = ques_result_all.sort_by{|s| s[:percent]}
        else
          @question_result_hash = ques_result_all.sort_by{|s| s[:"#{@paging_type}"]}
        end

        @exercise_questions_count = @exercise_questions.size
        @page  = params[:page] || 1
        @limit = params[:limit] || 10
        @question_result_hash = Kaminari.paginate_array(@question_result_hash).page(@page).per(@limit)
      rescue Exception => e
        uid_logger_error(e.message)
        tip_exception("没有权限")
        raise ActiveRecord::Rollback
      end
    end
  end

  private

  def exercise_params
    params.require(:exercise).permit(:exercise_name, :exercise_description, :course_id, :exercise_status, :user_id, :time,
                                      :publish_time, :end_time, :show_result, :question_random, :choice_random, :is_public,
                                      :score_open, :answer_open, :exercise_bank_id, :unified_setting, :show_statistic)
  end

  def is_course_teacher
    unless @user_course_identity < Course::STUDENT #为老师/助教/管理员
      normal_status(403, "...")
    end
  end

  #检查传入的参数内容是否符合
  def validates_exercise_params
    normal_status(-1, "试卷标题不能为空！") if params[:exercise_name].blank?
    normal_status(-1, "试卷标题不能超过60个字符") if (params[:exercise_name].length > 60)
    normal_status(-1, "试卷须知不能超过100个字符") if (params[:exercise_description].present? &&
        params[:exercise_description].length > 100)
  end

  #判断设置的时间是否合理
  def validate_publish_time
    # 截止时间存在，且截止时间必须大于当前时间或发布时间
    unified_setting = params[:unified_setting]
    publish_course = params[:publish_time_groups]
    if @course.is_end
      normal_status(-1,"课堂已结束不能再修改")
    elsif unified_setting
      ex_group_settings = @exercise.exercise_group_settings
      if ex_group_settings.present?
        p_time_present = ex_group_settings.publish_time_no_null.map(&:publish_time).min
        if p_time_present < Time.now
          normal_status(-1,"设置失败，存在已发布的分班")
        end
      elsif params[:publish_time].blank?
        normal_status(-1,"发布时间不允许为空")
      end
    elsif unified_setting.present? && !unified_setting   #非统一设置，分班不能为空
      if publish_course.present?
        course_ids = publish_course.map{|a| a[:course_group_id]}.sum
        publish_t =  publish_course.map{|a| a[:publish_time]}
        if course_ids.include?(nil) || course_ids.count == 0
          normal_status(-1,"请选择分班")
        elsif publish_t.include?(nil) || publish_t.count == 0
          normal_status(-1,"发布时间不允许为空")
        end
      else
        normal_status(-1,"请选择分班")
      end
    end
  end

  def get_exercise
    @exercise = Exercise.find_by(id:params[:id])
    if @exercise.blank?
      normal_status(404,"试卷不存在")
    else
      @course = @exercise.course
      normal_status(404,"课堂不存在") if @course.blank?
    end
  end

  def get_exercise_question_counts #获取试卷的问题数及总分数
    exercise_questions = @exercise.exercise_questions
    @exercise_ques_count = exercise_questions.size # 全部的题目数
    @exercise_ques_scores = exercise_questions.pluck(:question_score).sum

    #单选题的数量及分数
    exercise_single_ques = exercise_questions.find_by_custom("question_type",Exercise::SINGLE)
    @exercise_single_ques_count = exercise_single_ques.size
    @exercise_single_ques_scores = exercise_single_ques.pluck(:question_score).sum

    #多选题的数量及分数
    exercise_double_ques = exercise_questions.find_by_custom("question_type",Exercise::MULTIPLE)
    @exercise_double_ques_count = exercise_double_ques.size
    @exercise_double_ques_scores = exercise_double_ques.pluck(:question_score).sum

    # 判断题数量及分数
    exercise_ques_judge = exercise_questions.find_by_custom("question_type",Exercise::JUDGMENT)
    @exercise_ques_judge_count = exercise_ques_judge.size
    @exercise_ques_judge_scores = exercise_ques_judge.pluck(:question_score).sum

    #填空题数量及分数
    exercise_ques_null = exercise_questions.find_by_custom("question_type",Exercise::COMPLETION)
    @exercise_ques_null_count = exercise_ques_null.size
    @exercise_ques_null_scores = exercise_ques_null.pluck(:question_score).sum

    #简答题数量及分数
    exercise_ques_main = exercise_questions.find_by_custom("question_type",Exercise::SUBJECTIVE)
    @exercise_ques_main_count = exercise_ques_main.size
    @exercise_ques_main_scores = exercise_ques_main.pluck(:question_score).sum

    #实训题数量及分数
    exercise_ques_shixun = exercise_questions.find_by_custom("question_type",Exercise::PRACTICAL)
    @exercise_ques_shixun_count = exercise_ques_shixun.size
    @exercise_ques_shixun_scores = exercise_ques_shixun.pluck(:question_score).sum

    @exercise_questions = @exercise_questions&.includes(:exercise_choices,:exercise_shixun_challenges,:exercise_answers,:exercise_shixun_answers,:exercise_answer_comments,:exercise_standard_answers)

  end

  #获取用户有权限的分班
  def get_user_permission_course(exercise_ids,status)
    exercise_status = status.to_i #传入的试卷发布状态
    unpublish_group = []
    course_groups = []
    user_groups_id = @course.charge_group_ids(current_user)
    exercises_all = Exercise.includes(:exercise_group_settings).where(id:exercise_ids)
    exercises_all.each do |exercise|
      if exercise.present?
        if exercise.unified_setting  #统一设置只有两种情况，全部发布，全部截止
          exercise_user_status = exercise.get_exercise_status(current_user)   #当前用户的能看到的试卷
          if (exercise_user_status == exercise_status) || exercise_status == Exercise::DEADLINE #未发布的情况
            unpublish_group = unpublish_group + user_groups_id
          end
        else
          ex_all_group_settings = exercise.exercise_group_settings
          ex_group_settings = ex_all_group_settings.exercise_group_published.pluck(:course_group_id).uniq  #问卷设置的班级
          if exercise_status == Exercise::UNPUBLISHED
            unpublish_group =  user_groups_id - ex_group_settings
          elsif exercise_status == Exercise::DEADLINE
            ex_ended_groups = ex_all_group_settings.exercise_group_ended.pluck(:course_group_id).uniq
            ex_and_user = user_groups_id & ex_group_settings   #用户已设置的分班
            unpublish_group =  unpublish_group + ex_and_user - ex_ended_groups   #已发布的全部班级减去截止的全部班级
          else
            ex_and_user = user_groups_id & ex_group_settings   #用户已设置的分班
            unpublish_group = unpublish_group + ex_and_user
          end
        end
      end
    end
    unpublish_group = unpublish_group.uniq
    if unpublish_group.count > 0
      course_groups = CourseGroup.by_group_ids(unpublish_group)
    end
    course_groups
  end

  def set_exercise_status(publish_time,end_time)
    time_now_i = Time.now
    if publish_time.present? && (publish_time <= time_now_i) && (end_time > time_now_i)
      2
    elsif publish_time.nil? || (publish_time.present? && publish_time > time_now_i)
      1
    elsif end_time.present? && (end_time <= time_now_i)
      3
    elsif end_time.present? && publish_time.present? && (end_time < publish_time)
        normal_status(-1,"时间设置错误！")
    else
      1
    end
  end

  def check_course_public
    unless @course.is_public == 1  # 0为私有，1为公开
      normal_status(403,"...")
    end
  end

  def check_user_id_start_answer #判断用户在开始答题时，是否有用户id传入,如果为老师，则id必需，否则为当前用户的id
    user_login = params[:login]
    # exercise_current_user_id = params[:user_id]
    if user_login.blank? && @user_course_identity < Course::STUDENT  #id不存在，且当前为老师/管理员等
      normal_status(-1,"请输入学生登陆名！")
    else
      @ex_answerer = User.find_by(login: user_login) #回答者
      if @ex_answerer.blank?
        normal_status(404,"答题用户不存在")
      else
        @exercise_current_user_id = @ex_answerer.id || current_user.id
      end
    end
  end

  ## 判断开始答题页面的用户权限
  def check_user_on_answer
    if @user_course_identity == Course::STUDENT && @exercise.get_exercise_status(current_user) == Exercise::UNPUBLISHED   #试卷未发布，且当前用户不为老师/管理员
      normal_status(-1, "未发布试卷！")
    elsif @user_course_identity > Course::STUDENT && (!@exercise.is_public || (@exercise.is_public && !@exercise.unified_setting))  ##不为课堂成员，且试卷不为公开的,或试卷公开，但不是统一设置的
      normal_status(-1, "试卷暂未公开！")
    end
  end

  def check_exercise_time
    @answer_committed_user = @exercise.exercise_users.exercise_commit_users(current_user.id)&.first
    if @answer_committed_user.blank?
      normal_status(404,"答题用户不存在")
    end
  end

  #打回重做时的初步判断
  def check_exercise_status
    @exercise_users = @exercise.all_exercise_users(current_user.id).commit_exercise_by_status(1) #当前教师所在分班的全部已提交的学生数
    if @exercise.get_exercise_status(current_user) != Exercise::PUBLISHED
      normal_status(-1,"非提交中的试卷不允许打回重做！")
    elsif @exercise_users.count < 1
      normal_status(-1,"暂无人提交试卷！")
    end
  end


  #查看试题页面，当为学生时，除非试卷已截止，或已提交才可以查看
  def check_exercise_is_end
    ex_status = @exercise.get_exercise_status(current_user)
    @ex_user = @exercise.exercise_users.find_by(user_id:@exercise_current_user_id)  #该试卷的回答者
    if @user_course_identity > Course::ASSISTANT_PROFESSOR
      if ex_status == Exercise::UNPUBLISHED
        normal_status(-1,"试卷未发布")
      elsif @ex_user.present? && @ex_user.commit_status == 0
        normal_status(-1,"试卷未提交")
      elsif params[:user_id].present? && current_user.id != params[:user_id]
        normal_status(-1,"不能查看他人的试卷")
      end
    end
  end

  #查看试卷是否选择为公开统计
  def check_exercise_public
    if @user_course_identity > Course::ASSISTANT_PROFESSOR   #当前为学生,试卷公开统计，且已截止，且已提交
      ex_user = @exercise.exercise_users.exercise_commit_users(current_user.id).first
      unless @exercise.get_exercise_status(current_user) == Exercise::DEADLINE && ex_user.present? && ex_user.commit_status == 1 &&
          @exercise.show_statistic
        normal_status(-1,"学生暂不能查看")
      end
    end
  end

  def get_left_banner_id
    left_banner_content = @course.course_modules.search_by_module_type("exercise")
    if left_banner_content.present?
      @left_banner_id = left_banner_content.first.id
      @left_banner_name = left_banner_content.first.module_name
    else
      normal_status(404,"左侧导航不存在")
    end
  end

  def get_user_answer_status(exercise_questions,user_id,exercise,exercise_user_status)
    @question_status = []
    @exercise_all_questions = []
    ex_question_random = exercise.question_random
    question_answered = 0
    exercise_questions.each_with_index do |q,index|
      if ex_question_random && exercise_user_status != Exercise::DEADLINE
        ques_number = index + 1
      else
        ques_number = q.question_number
      end
      if q.question_type != Exercise::PRACTICAL
        ques_vote = q.exercise_answers.search_exercise_answer("user_id",user_id)
      else
        ques_vote = q.exercise_shixun_answers.search_shixun_answers("user_id",user_id)
      end
      ques_status = 0
      if ques_vote.present?
        if q.question_type == Exercise::PRACTICAL
          if ques_vote.pluck(:exercise_shixun_challenge_id).sort == q.exercise_shixun_challenges.pluck(:id).sort  #用户的总得分等于问题的分数
            ques_status = 1  #全部回答了，才算已答
            question_answered += 1
          end
        else  #其他题目，需回答的有内容，才会为已答，否则如内容为空，视为未答
          vote_answer_id = ques_vote.pluck(:exercise_choice_id).reject(&:blank?)
          vote_text_count = ques_vote.pluck(:answer_text).reject(&:blank?).size
          if q.question_type <= Exercise::JUDGMENT   #选择题和判断题的时候，需要有选项，才算回答
            if vote_answer_id.size > 0
              ques_status = 1
              question_answered += 1
            end
          elsif q.question_type == Exercise::COMPLETION   #填空题的时候，需要有选项和内容，才算回答
            if vote_answer_id.uniq.sort == q.exercise_standard_answers.pluck(:exercise_choice_id).uniq.sort
              ques_status = 1
              question_answered += 1
            end
          else
            if vote_text_count > 0    #主观题，必选有内容，才算回答
              ques_status = 1
              question_answered += 1
            end
          end
        end
      end
      question_status = {
          :ques_id => q.id,
          :ques_number => ques_number,  #仅问题的显示位置变化，但是问题的question_number 不会变化，与之相关的choice/standard_answer/answer不会变化
          :ques_status => ques_status,
      }
      question_options = {
          :question => q,
          :ques_number => ques_number,
      }
      @question_status = @question_status.push(question_status).sort_by {|k| k[:ques_number]}
      @exercise_all_questions = @exercise_all_questions.push(question_options).sort_by {|k| k[:ques_number]}
    end
  end
  #下一步也有check_on_users再进行判断
  def only_student_in
    if @user_course_identity < Course::STUDENT
      normal_status(-1,"老师身份不允许进入")
    end
  end

  #判断实训是否已选择
  def commit_shixun_present
    question_shixun_ids = @exercise.exercise_questions.pluck(:shixun_id).reject(&:blank?)
    shixun_id = params[:shixun_id]
    @shixun = Shixun.find_by(id: shixun_id)
    if shixun_id.present? && question_shixun_ids.include?(shixun_id)
      normal_status(-1,"该实训已选择！")
    elsif @shixun.blank?
      normal_status(-1,"该实训不存在！")
    end
  end

end