class HomeworkCommonController < ApplicationController
  require 'net/http'
  layout "base_courses"
  before_filter :find_course, :only => [:index,:new,:create,:next_step]
  before_filter :find_homework, :only => [:edit,:update,:alert_anonymous_comment,:start_anonymous_comment,:stop_anonymous_comment,:destroy]
  before_filter :teacher_of_course, :only => [:new, :create, :edit, :update, :destroy, :start_anonymous_comment, :stop_anonymous_comment, :alert_anonymous_comment]
  before_filter :member_of_course, :only => [:index]

  def index
    homeworks = @course.homework_commons.order("created_at desc")
    @is_teacher = User.current.logged? && (User.current.admin? || User.current.allowed_to?(:as_teacher,@course))
    @is_student = User.current.logged? && (User.current.admin? || (User.current.member_of_course?(@course) && !@is_teacher))
    @homeworks = paginateHelper homeworks,20
    respond_to do |format|
      format.html
    end
  end

  def new
    respond_to do |format|
      format.html
    end
  end

  #新建作业下一步
  def next_step
    @homework_type = params[:homework_common_type]

    @homework = HomeworkCommon.new
    @homework.safe_attributes = params[:homework_common]
    @homework.late_penalty = 0
    @homework.end_time = (Time.now  + 3600 * 24).strftime('%Y-%m-%d')
    @homework.publish_time = Time.now.strftime('%Y-%m-%d')

    if @homework_type == "1"
      #匿评作业相关属性
      @homework_detail_manual = HomeworkDetailManual.new
      @homework_detail_manual.ta_proportion = 0.6
      @homework_detail_manual.absence_penalty = 0
      @homework_detail_manual.evaluation_num = 3
      @homework_detail_manual.evaluation_start = Time.now.strftime('%Y-%m-%d')
      @homework_detail_manual.evaluation_end = (Time.now  + 3600 * 24).strftime('%Y-%m-%d')
      @homework.homework_detail_manual = @homework_detail_manual
    elsif @homework_type == "2"
      #编程作业相关属性
      @homework_detail_programing = HomeworkDetailPrograming.new
      @homework.homework_detail_programing = @homework_detail_programing
    end


    respond_to do |format|
      format.html
    end
  end

  def create
    if params[:homework_common]
      homework = HomeworkCommon.new
      homework.name = params[:homework_common][:name]
      homework.description = params[:homework_common][:description]
      homework.end_time = params[:homework_common][:end_time]
      homework.publish_time = params[:homework_common][:publish_time]
      homework.homework_type = params[:homework_common][:homework_type]
      homework.late_penalty = params[:late_penalty]
      homework.user_id = User.current.id
      homework.course_id = @course.id

      homework.save_attachments(params[:attachments])
      render_attachment_warning_if_needed(homework)

      if homework.homework_type == 2
        homework_detail_programing = HomeworkDetailPrograming.new
        homework_detail_programing.language = "C++"
        homework_detail_programing.standard_code = params[:standard_code]

        question = {title:homework.name,content:homework.description}
        uri = URI('http://fast.forge.trustie.net/api/questions.json')
        if params[:input] && params[:output]
          params[:input].each do |k,v|
            if params[:output].include? k
              homework_test = HomeworkTest.new
              homework_test.input = v
              homework_test.output = params[:output][k]
              homework.homework_tests << homework_test
              question[:input] = homework_test.input
              question[:output] = homework_test.output

              res = Net::HTTP.post_form(uri, question)
              result = JSON.parse(res.body)
              homework_detail_programing.question_id = result["id"] if result["status"] && result["status"] == 0
            end
          end
        end

        homework.homework_detail_programing = homework_detail_programing
      else
        #匿评作业相关属性
        homework_detail_manual = HomeworkDetailManual.new
        homework_detail_manual.ta_proportion = params[:ta_proportion] || 0.6
        homework_detail_manual.comment_status = 1
        homework_detail_manual.evaluation_start = params[:evaluation_start]
        homework_detail_manual.evaluation_end = params[:evaluation_end]
        homework_detail_manual.evaluation_num = params[:evaluation_num]
        homework_detail_manual.absence_penalty = params[:absence_penalty]
        homework.homework_detail_manual = homework_detail_manual
      end

      if homework.save
        respond_to do |format|
          format.html {
            flash[:notice] = l(:notice_successful_create)
            redirect_to homework_common_index_path(:course => @course.id)
          }
        end
        return
      end
    end

    respond_to do |format|
      format.html {
        flash[:notice] = l(:notice_failed_create)
        redirect_to new_homework_common_path(:course => @course.id)
      }
    end
  end

  def edit
    respond_to do |format|
      format.html
    end
  end

  def update
    @homework.name = params[:homework_common][:name]
    @homework.description = params[:homework_common][:description]
    @homework.end_time = params[:homework_common][:end_time]
    @homework.publish_time = params[:homework_common][:publish_time]
    @homework.homework_type = params[:homework_common][:homework_type]
    unless @homework.late_penalty == params[:late_penalty]
      @homework.student_works.where("created_at > '#{@homework.end_time} 23:59:59'").each do |student_work|
        student_work.late_penalty = params[:late_penalty]
        student_work.save
      end
      @homework.late_penalty = params[:late_penalty]
    end
    # @homework.course_id = @course.id

    #匿评作业相关属性
    if @homework.homework_type == 1 && @homework_detail_manual
      @homework_detail_manual.ta_proportion = params[:ta_proportion] || 0.6
      @homework_detail_manual.evaluation_start = params[:evaluation_start]
      @homework_detail_manual.evaluation_end = params[:evaluation_end]
      @homework_detail_manual.evaluation_num = params[:evaluation_num]
      unless @homework_detail_manual.absence_penalty == params[:absence_penalty]
        if @homework_detail_manual.comment_status == 3 #当前作业处于匿评结束状态，修改缺评扣分才会修改每个作品应扣分的值
          work_ids = "(" + @homework.student_works.map(&:id).join(",") + ")"
          @homework.student_works.each do |student_work|
            absence_penalty_count = student_work.user.student_works_evaluation_distributions.where("student_work_id IN #{work_ids}").count - student_work.user.student_works_scores.where("student_work_id IN #{work_ids}").count
            student_work.absence_penalty = absence_penalty_count > 0 ? absence_penalty_count * @homework_detail_manual.absence_penalty : 0
            student_work.save
          end
        end
        @homework_detail_manual.absence_penalty = params[:absence_penalty]
      end
    elsif @homework.homework_type == 0 #普通作业，缺评扣分为0分，每个作品的缺评扣分改为0分，防止某些作业在结束匿评之后改为普通作业
      @homework.student_works.where("absence_penalty != 0").each do |student_work|
        student_work.late_penalty = 0
        student_work.save
      end
      @homework_detail_manual.absence_penalty = 0 if @homework_detail_manual
    end

    if @homework.homework_type == 2 && @homework_detail_programing #编程作业
      @homework_detail_programing.language = "C++"
      @homework_detail_programing.standard_code = params[:standard_code]
      homework_tests = @homework.homework_tests
      #需要删除的测试
      ids = homework_tests.map(&:id) - params[:input].keys.map(&:to_i)
      ids.each do |id|
        homework_test = HomeworkTest.find id
        homework_test.destroy if homework_test
      end
      if params[:input] && params[:output]
        params[:input].each do |k,v|
          if params[:output].include? k
            homework_test = HomeworkTest.find_by_id k
            if homework_test #已存在的测试，修改
              homework_test.input = v
              homework_test.output = params[:output][k]
            else #不存在的测试，增加
              homework_test = HomeworkTest.new
              homework_test.input = v
              homework_test.output = params[:output][k]
              homework_test.homework_common = @homework
            end
            homework_test.save
          end
        end
      end
    end

    @homework.save_attachments(params[:attachments])
    render_attachment_warning_if_needed(@homework)

    if @homework.save
      @homework_detail_manual.save if @homework_detail_manual
      @homework_detail_programing.save if @homework_detail_programing
      respond_to do |format|
        format.html {
          flash[:notice] = l(:notice_successful_edit)
          redirect_to homework_common_index_path(:course => @course.id)
        }
      end
      return
    else
      respond_to do |format|
        format.html {
          flash[:notice] = l(:notice_failed_edit)
          redirect_to edit_homework_common_path(@homework)
        }
      end
    end
  end

  def destroy
    if @homework.destroy
      respond_to do |format|
        format.html {redirect_to homework_common_index_path(:course => @course.id)}
      end
    end
  end

  #开启匿评
  #statue 1:启动成功，2：启动失败，作业总数大于等于2份时才能启动匿评，3:已开启匿评，请务重复开启,4:没有开启匿评的权限
  def start_anonymous_comment
    @statue =4 and return unless User.current.admin? || User.current.allowed_to?(:as_teacher,@course)
    @statue = 5 and return if Time.parse(@homework.end_time.to_s).strftime("%Y-%m-%d") >= Time.now.strftime("%Y-%m-%d")
    if @homework_detail_manual.comment_status == 1
      student_works = @homework.student_works
      if student_works && student_works.size >=2
        student_works.each_with_index do |work, index|
          user = work.user
          n = @homework_detail_manual.evaluation_num
          n = n < student_works.size ? n : student_works.size - 1
          assigned_homeworks = get_assigned_homeworks(student_works, n, index)
          assigned_homeworks.each do |h|
            student_works_evaluation_distributions = StudentWorksEvaluationDistribution.new(user_id: user.id, student_work_id: h.id)
            student_works_evaluation_distributions.save
          end
        end
        @homework_detail_manual.update_column('comment_status', 2)
        @statue = 1
      else
        @statue = 2
      end
    else
      @statue = 3
    end
  end

  #关闭匿评
  def stop_anonymous_comment
    @homework_detail_manual.update_column('comment_status', 3)

    work_ids = "(" + @homework.student_works.map(&:id).join(",") + ")"
    @homework.student_works.each do |student_work|
      absence_penalty_count = student_work.user.student_works_evaluation_distributions.where("student_work_id IN #{work_ids}").count - student_work.user.student_works_scores.where("student_work_id IN #{work_ids}").count
      student_work.absence_penalty = absence_penalty_count > 0 ? absence_penalty_count * @homework_detail_manual.absence_penalty : 0
      student_work.save
    end

    respond_to do |format|
      format.js
    end
  end

  #提示
  def alert_anonymous_comment
    @cur_size = 0
    @totle_size = 0
    if @homework_detail_manual.comment_status == 1
      @totle_size = @course.student.count
      @cur_size = @homework.student_works.size
    elsif @homework_detail_manual.comment_status == 2
      @homework.student_works.map { |work| @totle_size += work.student_works_evaluation_distributions.count}
      @cur_size = 0
      @homework.student_works.map { |work| @cur_size += work.student_works_scores.where(:reviewer_role => 3).count}
    end
    @percent = format("%.2f",(@cur_size.to_f / ( @totle_size == 0 ? 1 : @totle_size)) * 100)
    respond_to do |format|
      format.js
    end
  end

  private
  #获取课程
  def find_course
    @course = Course.find params[:course]
  rescue
    render_404
  end
  #获取作业
  def find_homework
    @homework = HomeworkCommon.find params[:id]
    @homework_detail_manual = @homework.homework_detail_manual
    @homework_detail_programing = @homework.homework_detail_programing
    @course = @homework.course
  rescue
    render_404
  end
  #是不是课程的老师
  def teacher_of_course
    render_403 unless User.current.allowed_to?(:as_teacher,@course) || User.current.admin?
  end

  #当前用户是不是课程的成员
  def member_of_course
    render_403 unless @course.is_public || User.current.member_of_course?(@course) || User.current.admin?
  end

  def get_assigned_homeworks(student_works, n, index)
    student_works += student_works
    student_works[index + 1 .. index + n]
  end
end