class ExerciseAnswersController < ApplicationController
  before_action :require_login, :check_auth
  before_action :get_exercise_question
  include ExercisesHelper

  def create  #每一次答案的点击，请求一次，实训题不在这里回答
    begin
      q_type = @exercise_question.question_type  #试卷的类型
      choice_id = params[:exercise_choice_id].present? ? params[:exercise_choice_id] : ""
      answer_text = params[:answer_text].present? ? params[:answer_text].strip : ""  #为字符串
      if q_type < Exercise::SUBJECTIVE && (q_type != Exercise::MULTIPLE) && choice_id.blank?
        normal_status(-1,"请选择序号")
      else
        ea = @exercise_question.exercise_answers.search_answer_users("user_id",current_user.id)  #试卷的当前用户的答案
        if q_type == Exercise::SINGLE || q_type == Exercise::JUDGMENT  #选择题（单选）/判断题
          if ea.exists?
            ea.first.update_attribute(:exercise_choice_id,choice_id )
          else
            answer_option = {
              :user_id => current_user.id,
              :exercise_question_id => @exercise_question.id,
              :exercise_choice_id => choice_id,
              :answer_text => ""
            }
            ex_a = ExerciseAnswer.new(answer_option)
            ex_a.save!
          end
        elsif q_type == Exercise::MULTIPLE   #多选题的
          choice_ids = params[:exercise_choice_id].present? ? params[:exercise_choice_id] : []

          ea_ids = ea.pluck(:exercise_choice_id)
          common_answer_ids = choice_ids & ea_ids   #已经存在的试卷选项id
          new_ids = (choice_ids - common_answer_ids).uniq   # 新增的id
          old_ids = (ea_ids - common_answer_ids).uniq  #没有选择的，则删掉
          if new_ids.size > 0
            new_ids.each do |e|
              answer_option = {
                  :user_id => current_user.id,
                  :exercise_question_id => @exercise_question.id,
                  :exercise_choice_id => e,
                  :answer_text => ""
              }
              ex_a = ExerciseAnswer.new(answer_option)
              ex_a.save!
            end
          end
          if old_ids.size > 0
            ea_answer = ea.search_answer_users("exercise_choice_id",old_ids)
            ea_answer.destroy_all
          end
        elsif q_type == Exercise::COMPLETION  #填空题
          answer_option = {
              :user_id => current_user.id,
              :exercise_question_id => @exercise_question.id,
              :exercise_choice_id => choice_id,
              :answer_text => answer_text
          }
          ea_answer = ea.search_answer_users("exercise_choice_id",choice_id)
          if ea.present? && ea_answer.present?
            ea_answer.update(answer_option)
          else
            ex_new = ExerciseAnswer.new(answer_option)
            ex_new.save!
          end
        elsif q_type == Exercise::SUBJECTIVE  #简答题
          answer_option = {
              :user_id => current_user.id,
              :exercise_question_id => @exercise_question.id
          }
          if ea.present? #已经回答了的，
            ea.first.update_attribute("answer_text",answer_text)
          else
            answer_option.merge!(answer_text:answer_text)
            ex_a = ExerciseAnswer.new(answer_option)
            ex_a.save!
          end
        end
        normal_status(0,"回答成功")
      end
    rescue Exception => e
      uid_logger_error(e.message)
      tip_exception("页面调用失败！")
      raise ActiveRecord::Rollback
    end
  end

  private

  def get_exercise_question
    @exercise_question = ExerciseQuestion.find_by_id(params[:exercise_question_id])
    @exercise = @exercise_question&.exercise
    @course = @exercise&.course
    @exercise_user = @exercise&.exercise_users.find_by(user_id: current_user.id) #当前用户
    @exercise_user_status = @exercise.get_exercise_status(current_user)

    if @exercise_question.blank?
      normal_status(-1,"试卷问题不存在！")
    elsif @exercise.blank?
      normal_status(-1,"试卷不存在！")
    elsif @course.blank?
      normal_status(-1,"该课堂不存在！")
    elsif @exercise_user.blank?
      normal_status(-1,"试卷用户不存在！")
    elsif @exercise_user.commit_status == 1
      normal_status(-1,"已提交/已结束的试卷不允许修改！")
    else
      if (@exercise_user_status == Exercise::DEADLINE && @exercise_user.commit_status == 0) || (@exercise.time > 0 && @exercise_user.start_at.present? && ((@exercise_user.start_at + @exercise.time.to_i.minutes) < Time.now))
        objective_score = calculate_student_score(@exercise,current_user,Time.now)[:total_score]
        subjective_score = @exercise_user.subjective_score < 0.0 ? 0.0 : @exercise_user.subjective_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 => subjective_score
        }
        @exercise_user.update_attributes(commit_option)
        normal_status(-1,"试卷提交时间已截止！")
      end
    end

  end

end