socialforge/app/controllers/poll_controller.rb

class PollController < ApplicationController
  before_filter :find_poll_and_course, :only => [:edit,:update,:destroy,:show,:statistics_result,:create_poll_question,:commit_poll,:commit_answer,:publish_poll,:republish_poll,:poll_result,:close_poll]
  before_filter :find_container, :only => [:new,:create, :index]
  before_filter :is_member_of_course, :only => [:index,:show,:poll_result]
  before_filter :is_course_teacher, :only => [:new,:create,:edit,:update,:destroy,:publish_poll,:republish_poll,:close_poll]
  include PollHelper
  def index
    if @course
      @is_teacher = User.current.allowed_to?(:as_teacher,@course)
      if @is_teacher
        polls = Poll.where("polls_type = 'Course' and polls_group_id = #{@course.id}")
      else
        polls = Poll.where("polls_type = 'Course' and polls_group_id = #{@course.id} and polls_status = 2")
      end
      @polls = paginateHelper polls,20 #分页
      respond_to do |format|
        format.html{render :layout => 'base_courses'}
      end
    elsif @project
      #项目的问卷调查相关代码
    end
  end

  def show
    @poll = Poll.find params[:id]
    #已提交问卷的用户不能再访问该界面
    if has_commit_poll?(@poll.id,User.current.id) && (!User.current.admin?)
      render_403
    else
      @can_edit_poll = (!has_commit_poll?(@poll.id,User.current.id)) || User.current.admin?
      @percent = get_percent(@poll,User.current)
      poll_questions = @poll.poll_questions
      @poll_questions = paginateHelper poll_questions,5 #分页
      respond_to do |format|
        format.html {render :layout => 'base_courses'}
      end
    end
  end

  def new
    if @course
      option = {
          :polls_name => "",
          :polls_type => @course.class.to_s,
          :polls_group_id => @course.id,
          :polls_status => 1,
          :user_id => User.current.id,
          :published_at => Time.now,
          :closed_at => Time.now,
          :show_result => 1,
          :polls_description => ""
      }
      @poll = Poll.create option
      if @poll
        redirect_to edit_poll_url @poll.id
      end
    elsif @project
      #项目的问卷调查相关代码
    end
  end

  def create

  end

  def edit
    respond_to do |format|
      format.html{render :layout => 'base_courses'}
    end
  end

  def update
    @poll.polls_name = params[:polls_name]
    @poll.polls_description = params[:polls_description]
    if @poll.save
      respond_to do |format|
        format.js
      end
    else
      render_404
    end
  end

  def destroy
    if @poll && @poll.destroy
      if @is_teacher
        polls = Poll.where("polls_type = 'Course' and polls_group_id = #{@course.id}")
      else
        polls = Poll.where("polls_type = 'Course' and polls_group_id = #{@course.id} and polls_status = 2")
      end
      @polls = paginateHelper polls,20 #分页
      respond_to do |format|
        format.js
      end
    end
  end

  def statistics_result
    @poll = Poll.find(params[:id])
    poll_questions = @poll.poll_questions 
    @poll_questions = paginateHelper poll_questions, 5
    respond_to do |format|
      format.html{render :layout => 'base_courses'}
    end
  end
  
   def get_poll_totalcount poll_question
    @total_questions_count = poll_question.poll_votes.count
  end
  
  def get_poll_everycount  poll_answer
    @every_answer_count =  poll_answer.poll_votes.count
  end
  

  #添加题目
  def create_poll_question
    question_title = params[:poll_questions_title].nil? || params[:poll_questions_title].empty? ? l(:label_enter_single_title) : params[:poll_questions_title]
    option = {
        :is_necessary => (params[:is_necessary]=="true" ? 1 : 0),
        :question_title => question_title,
        :question_type => params[:question_type] || 1,
        :question_number => @poll.poll_questions.count + 1
    }
    @poll_questions = @poll.poll_questions.new option
    if params[:question_answer]
      for i in 1..params[:question_answer].count
        answer = (params[:question_answer].values[i-1].nil? || params[:question_answer].values[i-1].empty?) ? l(:label_new_answer) : params[:question_answer].values[i-1]
        question_option = {
            :answer_position => i,
            :answer_text => answer
        }
        @poll_questions.poll_answers.new question_option
      end
    end
    if @poll_questions.save
      respond_to do |format|
        format.js
      end
    end
  end

  #修改题目
  def update_poll_question
    @poll_question = PollQuestion.find params[:poll_question]
    #@poll = @poll_question.poll
    @poll_question.is_necessary = params[:is_necessary]=="true" ? 1 : 0
    @poll_question.question_title = params[:poll_questions_title].nil? || params[:poll_questions_title].empty? ? l(:label_enter_single_title) : params[:poll_questions_title]
    ################处理选项
    if params[:question_answer]
      @poll_question.poll_answers.each do |answer|
        answer.destroy unless params[:question_answer].keys.include? answer.id.to_s
      end
      for i in 1..params[:question_answer].count
        question = @poll_question.poll_answers.find_by_id params[:question_answer].keys[i-1]
        answer = (params[:question_answer].values[i-1].nil? || params[:question_answer].values[i-1].empty?) ? l(:label_new_answer) : params[:question_answer].values[i-1]
        if question
          question.answer_position = i
          question.answer_text = answer
          question.save
        else
          question_option = {
              :answer_position => i,
              :answer_text => answer
          }
          @poll_question.poll_answers.new question_option
        end
      end
    end
    @poll_question.save
    respond_to do |format|
      format.js
    end
  end

  #删除题目
  def delete_poll_question
    @poll_question = PollQuestion.find params[:poll_question]
    @poll = @poll_question.poll
    poll_questions = @poll.poll_questions.where("question_number > #{@poll_question.question_number}")
    poll_questions.each do |question|
      question.question_number -= 1
      question.save
    end
    if @poll_question && @poll_question.destroy
      respond_to do |format|
        format.js
      end
    end
  end

  #发布问卷
  def publish_poll
    @poll.polls_status = 2
    @poll.published_at = Time.now
    if @poll.save
      if params[:is_remote]
        redirect_to poll_index_url(:polls_type => "Course", :polls_group_id => @course.id)
      else
        respond_to do |format|
          format.js
        end
      end
    end
  end

  #提交答案
  def commit_answer
    pq = PollQuestion.find(params[:poll_question_id])
    if has_commit_poll?(@poll.id,User.current.id) && (!User.current.admin?)
      render :json => {:text => "failure"}
      return
    end
    if pq.question_type == 1
      #单选题
      pv = PollVote.find_by_poll_question_id_and_user_id(params[:poll_question_id],User.current.id)
      if pv.nil?
        #尚未答该题，添加答案
        pv = PollVote.new
        pv.user_id = User.current.id
        pv.poll_question_id = params[:poll_question_id]
      end
      #修改该题对应答案
      pv.poll_answer_id = params[:poll_answer_id]
      if pv.save
        #保存成功返回成功信息及当前以答题百分比
        @percent = get_percent(@poll,User.current)
        render :json => {:text => "ok" ,:percent => format("%.2f" ,@percent)}
      else
        #返回失败信息
        render :json => {:text => "failure"}
      end
    elsif pq.question_type == 2
      #多选题
      pv = PollVote.find_by_poll_answer_id_and_user_id(params[:poll_answer_id],User.current.id)
      if pv.nil?
        #尚未答该题，添加答案
        pv = PollVote.new
        pv.user_id = User.current.id
        pv.poll_question_id = params[:poll_question_id]
        pv.poll_answer_id = params[:poll_answer_id]
        if pv.save
          @percent = get_percent(@poll,User.current)
          render :json => {:text => "true",:percent => format("%.2f" ,@percent)}
        else
          render :json => {:text => "failure"}
        end
      else
        #pv不为空，则当前选项之前已被选择，再次点击则是不再选择该项，故删除该答案
        if pv.delete
          @percent = get_percent(@poll,User.current)
          render :json => {:text => "false" ,:percent => format("%.2f" ,@percent)}
        else
          render :json => {:text => "failure"}
        end
      end
    elsif pq.question_type == 3 || pq.question_type == 4
      #单行文本，多行文本题
      pv = PollVote.find_by_poll_question_id_and_user_id(params[:poll_question_id],User.current.id)
      if pv.nil?
        #pv为空之前尚未答题，添加答案
        if params[:vote_text].nil? || params[:vote_text].blank?
          #用户提交空答案，视作不作答
          @percent = get_percent(@poll,User.current)
          render :json => {:text => pv.vote_text,:percent => format("%.2f" ,@percent)}
        else
          #添加答案
          pv = PollVote.new
          pv.user_id = User.current.id
          pv.poll_question_id = params[:poll_question_id]
          pv.vote_text = params[:vote_text]
          if pv.save
            @percent = get_percent(@poll,User.current)
            render :json => {:text => pv.vote_text,:percent => format("%.2f" ,@percent)}
          else
            render :json => {:text => "failure"}
          end
        end
      else
        #pv不为空说明用户之前已作答
        if params[:vote_text].nil? || params[:vote_text].blank?
          #用户提交空答案，视为删除答案
          if pv.delete
            @percent = get_percent(@poll,User.current)
            render :json => {:text => pv.vote_text,:percent => format("%.2f" ,@percent)}
          else
            render :json => {:text => "failure"}
          end
        else
          #用户修改答案
          pv.vote_text = params[:vote_text]
          if pv.save
            @percent = get_percent(@poll,User.current)
            render :json => {:text => pv.vote_text,:percent => format("%.2f" ,@percent)}
          else
            render :json => {:text => "failure"}
          end
        end
      end

    else
      render :json => {:text => "failure"}
    end
  end

  #提交问卷
  def commit_poll
    @uncomplete_question = get_uncomplete_question(@poll,User.current)
    if @uncomplete_question.count < 1
      pu = get_poll_user(@poll.id,User.current.id)
      pu.user_id = User.current.id
      pu.poll_id = @poll.id
      if pu.save
        #redirect_to poll_index_path(:polls_group_id => @course.id,:polls_type => 'Course')
        @status = 0 #提交成功
      else
        @status = 2 #未知错误
      end
    else
        @status = 1 #有未做得必答题
    end
    respond_to do |format|
      format.js
    end
  end

  #重新发布问卷
  def republish_poll
    @poll.poll_questions.each do |poll_question|
      poll_question.poll_votes.destroy_all
    end
    @poll.poll_users.destroy_all
    @poll.polls_status = 1
    @poll.save
    respond_to do |format|
      format.js
    end
  end

  #显示某个学生某份问卷的填写结果
  def poll_result
    @poll_questions = paginateHelper @poll.poll_questions,5
    respond_to do |format|
      format.html{render :layout => 'base_courses'}
    end
  end

  #关闭问卷
  def close_poll
    @poll.polls_status = 3
    @poll.closed_at = Time.now
    if @poll.save
      respond_to do |format|
        format.js
      end
    end
  end

  private
  def find_poll_and_course
    @poll = Poll.find params[:id]
    @course = Course.find @poll.polls_group_id
  rescue Exception => e
    render_404
  end

  def find_container
    if params[:polls_type] && params[:polls_group_id]
      case params[:polls_type]
        when "Course"
          @course = Course.find_by_id params[:polls_group_id]
        when "Project"
          @project = Project.find_by_id params[:polls_group_id]
      end
    else
      render_404
    end
  end

  def is_member_of_course
    render_403 unless(@course && User.current.member_of_course?(@course))
  end

  def is_course_teacher
    @is_teacher = User.current.allowed_to?(:as_teacher,@course)
    render_403 unless(@course && @is_teacher)
  end

  #获取未完成的题目
  def get_uncomplete_question poll,user
    necessary_questions = poll.poll_questions.where("#{PollQuestion.table_name}.is_necessary = 1")
    uncomplete_question = []
    necessary_questions.each do |question|
      answers = get_user_answer(question,user)
      if answers.nil? || answers.count < 1
        uncomplete_question << question
      end
    end
    uncomplete_question
  end

  #获取用户对某个问题的答案
  def get_user_answer(question,user)
    user_answer = question.poll_votes.where("#{PollVote.table_name}.user_id = #{user.id}")
    user_answer
  end

  def get_complete_question(poll,user)
    questions = poll.poll_questions
    complete_question = []
    questions.each do |question|
      answers = get_user_answer(question,user)
      if !(answers.nil? || answers.count < 1)
        complete_question << question
      end
    end
    complete_question
  end

  def get_percent poll,user
    complete_count = get_complete_question(poll,user).count
    if poll.poll_questions.count == 0
      return 0
    else
      return (complete_count.to_f / poll.poll_questions.count.to_f)*100
    end
  end

  #PollUser记录用户是否已提交问卷有对应的记录则已提交，没有则新建一个
  def get_poll_user poll_id,user_id
    pu = PollUser.find_by_poll_id_and_user_id(poll_id,user_id)
    if pu.nil?
      pu = PollUser.new
    end
    pu
  end
end