class ExerciseController < ApplicationController
  layout "base_courses"

  before_filter :find_course, :only => [:index,:new,:create,:student_exercise_list]
  def index
    @is_teacher = User.current.allowed_to?(:as_teacher,@course)
    if @is_teacher
      exercises = @course.exercises
    else
      exercises = @course.exercises.where(:exercise_status => 1)
    end
    @exercises = paginateHelper exercises,20 #分页
    respond_to do |format|
      format.html
    end
  end

  def show
    @exercise = Exercise.find params[:id]
    if @exercise.exercise_status != 2 && (!User.current.allowed_to?(:as_teacher,@course) || User.current.admin?)
      render_403
      return
    end
    # 问卷消息状态更新
    # REDO:问卷添加消息
    #已提交问卷的用户不能再访问该界面
    if has_commit_exercise?(@poll.id,User.current.id) && (!User.current.admin?)
      redirect_to poll_index_url(:polls_type => "Course", :polls_group_id => @course.id)
    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
  end

  def new
    option = {
        :exercise_name => "",
        :exercise_description => "",
        :course_id => @course.id,
        :exercise_status => 1,
        :user_id => User.current.id,
        :start_at => "",
        :end_at => ""
    }
    @exercise = Exercise.create option
    if @exercise
      redirect_to edit_exercise_url @exercise.id
    end
  end

  def create

  end

  def edit

  end

  def update
    @exercise.exercise_name = params[:exercise_name]
    @exercise.exercise_description = params[:exercise_name]
    @exercise.start_at = params[:start_at]
    @exercise.end_at = params[:end_at]
    if @exercise.save
      respond_to do |format|
        format.js
      end
    else
      render_404
      end
  end

  def destroy
    if @exercise && @exercise.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

  #统计结果
  def statistics_result

  end

  def student_exercise_list
    @is_teacher = User.current.allowed_to?(:as_teacher,@course) || User.current.admin?
    @exercise = Exercise.find params[:id]
    @all_exercises = @course.exercises.order("created_at desc")
    @exercise_count = @exercise.exercise_users.where('score is not NULL').count
    if @is_teacher || (!@exercise.exercise_users.where(:user_id => User.current.id).empty? && Time.parse(@exercise.end_time.to_s).strftime("%Y-%m-%d-%H-%M-%S") <= Time.now.strftime("%Y-%m-%d-%H-%M-%S"))
      @exercise_users_list = @exercise.exercise_users.where('score is not NULL')
    elsif !@exercise.exercise_users.where(:user_id => User.current.id).empty? && Time.parse(@exercise.end_time.to_s).strftime("%Y-%m-%d-%H-%M-%S") > Time.now.strftime("%Y-%m-%d-%H-%M-%S")
      @exercise_users_list = @exercise.exercise_users.where("user_id = ? and score is not NULL",User.current.id)
    else
      @exercise_users_list = []
    end
    respond_to do |format|
      format.html
    end
  end

  private
  def find_course
    @course = Course.find params[:course_id]
  rescue Exception => e
    render_404
  end
end