socialforge/app/controllers/homework_attach_controller.rb

class HomeworkAttachController < ApplicationController
  layout "course_base"
  include CoursesHelper
  include HomeworkAttachHelper
  helper :words
  ###############################
  before_filter :can_show_course,except: []
  #判断当前角色权限时需先找到当前操作的project
  before_filter :find_course_by_bid_id, :only => [:new]
  before_filter :find_bid_and_course,:only => [:get_not_batch_homework,:get_batch_homeworks,:get_homeworks,:get_homework_jours, :get_student_batch_homework, :get_my_homework]
  before_filter :find_course_by_hoemwork_id, :only => [:edit,:update,:destroy,:show,:add_homework_users,:destory_homework_users, :praise_homework]
  #判断当前角色是否有操作权限
  #勿删 before_filter :authorize, :only => [:new,:edit,:update,:destroy]

  #@cur_type:
  #1.未批作业列表
  #2.已批作业列表
  #3.全部作业列表
  #4.匿评作业列表
  #根据此字段判断关闭homework_attach的show界面后是否要调用js刷新页面

  #获取未批作业列表
  def get_not_batch_homework
    @not_batch_homework = true
    sort, direction = params[:sort] || "s_socre", params[:direction] || "desc"
    get_not_batch_homework_list sort,direction, @bid.id
    @cur_page = params[:page] || 1
    @cur_type = 1
    @direction = direction == 'asc'? 'desc' : 'asc'
    respond_to do |format|
      format.js
      format.xls {
        send_data(homework_to_xls(@all_homework_list), :type => "text/excel;charset=utf-8; header=present",
                  :filename => "not_rated_homework_#{Time.now.strftime("%Y%m%d")}.xls")
      }
    end
  end

  #获取已评作业列表
  def get_batch_homeworks
    sort, direction = params[:sort] || "s_socre", params[:direction] || "desc"
    @is_batch_homeworks = true
    if sort == 't_socre'
      order_by = "t_score  #{direction}"
    elsif sort == 's_socre'
      order_by = "s_score  #{direction}"
    elsif sort == 'time'
      order_by = "created_at #{direction}"
    end
    all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT * FROM (SELECT homework_attaches.*,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 and stars IS NOT NULL) AS t_score,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
            FROM homework_attaches WHERE bid_id = #{@bid.id}
            ORDER BY #{order_by}) AS table1
            WHERE table1.t_score IS NOT NULL")
    @cur_page = params[:page] || 1
    @cur_type = 2
    @homework_list = paginateHelper all_homework_list,10
    @direction = direction == 'asc'? 'desc' : 'asc'
    respond_to do |format|
      format.js
      format.xls {
        send_data(homework_to_xls(all_homework_list), :type => "text/excel;charset=utf-8; header=present",
                  :filename => "been_rated_homework_#{Time.now.strftime("%Y%m%d")}.xls")
      }
    end
  end



  #获取所有作业列表
  def get_homeworks
    @is_all_homeworks = true
    sort, direction = params[:sort] || "s_socre", params[:direction] || "desc"
    if sort == 't_socre'
      order_by = "t_score  #{direction}"
    elsif sort == 's_socre'
      order_by = "s_score  #{direction}"
    elsif sort == 'time'
      order_by = "created_at #{direction}"
    end
    all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT homework_attaches.*,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
            FROM homework_attaches WHERE bid_id = #{@bid.id}
            ORDER BY #{order_by}")
    @cur_page = params[:page] || 1
    @cur_type = 3
    @homework_list = paginateHelper all_homework_list,10
    @direction = direction == 'asc'? 'desc' : 'asc'
    respond_to do |format|
      format.js
      format.xls {
        send_data(homework_to_xls(all_homework_list), :type => "text/excel;charset=utf-8; header=present",
                  :filename => "all_homework_#{Time.now.strftime("%Y%m%d")}.xls")
      }
    end
  end

  #获取学生匿评列表
  def get_student_batch_homework
    @is_student_batch_homework = true
    all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT homework_attaches.*,
          (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
          (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score,
          (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND rater_id = #{User.current.id}  AND is_teacher_score = 0) AS m_score
          FROM homework_attaches
          INNER JOIN homework_evaluations ON homework_evaluations.homework_attach_id = homework_attaches.id
          WHERE homework_attaches.bid_id = #{@bid.id} AND homework_evaluations.user_id = #{User.current.id} ORDER BY m_score DESC")
    @cur_page = params[:page] || 1
    @cur_type = 4
    @homework_list = paginateHelper all_homework_list,10
    respond_to do |format|
      format.js
    end
  end

  #获取我的作业
  def get_my_homework
    @is_my_homework = true
    all_homework_list = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
        FROM homework_attaches
        WHERE homework_attaches.bid_id = #{@bid.id} AND homework_attaches.user_id = #{User.current.id}")
    #如果我没有创建过作业，就检索我是否参与了某个作业
    if all_homework_list.empty?
      all_homework_list = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
        FROM homework_attaches
        INNER JOIN homework_users ON homework_users.homework_attach_id = homework_attaches.id
        WHERE homework_attaches.bid_id = #{@bid.id} AND homework_users.user_id = #{User.current.id}")
    end
    @cur_page = params[:page] || 1
    @homework_list = paginateHelper all_homework_list,10
    respond_to do |format|
      format.js
    end
  end

  #获取作业的留言列表
  def get_homework_jours
    @user = @bid.author
    @jours = @bid.journals_for_messages.where('m_parent_id IS NULL').order('created_on DESC')
    @jour = paginateHelper @jours,10
    @state = false
    respond_to do |format|
      format.js
    end
  end

  #为作业点赞
  def praise_homework
    pt = PraiseTread.new
    pt.user_id = User.current.id
    pt.praise_tread_object_id = @homework.id
    pt.praise_tread_object_type = "HomeworkAttach"
    pt.praise_or_tread = 1
    if pt.save
      respond_to do |format|
        format.js
      end
    else
      render_404
    end
  end

  #获取作业的成员
  def get_homework_member homework
    @hoemwork_users = users_for_homework(@homework)
    @members = members_for_homework(@homework,@hoemwork_users,params[:q])
    @members = paginateHelper @members,10
  end

  def index
    @homeworks = HomeworkAttach.all
    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @homeworks }
    end
  end

  #作业添加成员（参与人员）
  def add_homework_users
    if User.current.admin? ||  User.current.member_of_course?(@homework.bid.courses.first)
      #@homework = HomeworkAttach.find(params[:id])
      if params[:membership]
        if params[:membership][:user_ids]
          attrs = params[:membership].dup
          user_ids = attrs.delete(:user_ids)
          user_ids.each do |user_id|
            @homework.homework_users.build(:user_id => user_id)
          end
        end
      end
      @homework.save
      get_homework_member @homework
      respond_to do |format|
        format.js
      end
    else
      render_403 :message => :notice_not_authorized
    end
  end

  #作业删除成员（参与人员）
  def destory_homework_users
    #@homework = HomeworkAttach.find(params[:id])
    if User.current.admin? ||  User.current.member_of_course?(@homework.bid.courses.first)
      homework_user = @homework.homework_users.where("user_id = #{params[:user_id]}").first
      homework_user.destroy
      get_homework_member @homework

      @homework_list = []
      @is_my_homework = true
      respond_to do |format|
        format.js
      end
    else
      render_403 :message => :notice_not_authorized
    end
  end

  def create
    bid = Bid.find params[:bid_id]
    if User.current.admin? || User.current.member_of_course?(bid.courses.first)   # modify by nwb
      if bid.homeworks.where("user_id = ?",User.current).empty?
        user_id = params[:user_id]
        bid_id = params[:bid_id]
        if params[:homework_attach]
          if params[:homework_attach][:project_id]
            project_id = params[:homework_attach][:project_id]
          else
            project_id = 0
          end
        else
          project_id = 0
        end
        sta = 0
        name = params[:homework_attach][:name]
        description = params[:homework_attach][:description]
        options = {
            :user_id => user_id,
            :state => sta,
            :name => name,
            :description => description,
            :bid_id => bid_id,
            :project_id => project_id
        }

        @homework = HomeworkAttach.new(options)
        @homework.save_attachments(params[:attachments])
        render_attachment_warning_if_needed(@homework)

        if @homework.save
          respond_to do |format|
            format.html { redirect_to course_for_bid_url @homework.bid }
            format.json { head :no_content }
          end
        else
          render_403 :message => :notice_not_authorized
        end
      else
        render_403 :message => :notice_has_homework
      end
    else
      render_403 :message => :notice_not_authorized
    end
  end

  def new
    @bid = Bid.find(params[:id])
    if User.current.admin? || User.current.member_of_course?(@bid.courses.first)
      @homework = HomeworkAttach.new
      respond_to do |format|
        format.html # new.html.erb
        format.json { render json: @homework }
      end
    else
      render_403 :message => :notice_not_authorized
    end
  end

  #获取作业成员的集合
  def get_homework_member_list
    @homework = HomeworkAttach.find(params[:bid_id])
    course = @homework.bid.courses.first
    if User.current.admin? || User.current.member_of_course?(course)
      get_homework_member @homework
    else
      raise "error"
    end
    respond_to do |format|
      format.js
    end
  end

  #获取可选成员列表
  #homework：作业
  #users：该作业所有成员
  #q:模糊匹配的用户的昵称
  def members_for_homework homework,users,q
    unpartin_users = homework.bid.courses.first.members.where("user_id not in (:users)", {:users => users}).joins(:user).where("users.login like '%#{q}%'")
    canpartin_users = []
    unpartin_users.each do |m|
        if m.user.allowed_to?(:paret_in_homework,homework.bid.courses.first)
          canpartin_users << m
        end
    end
    canpartin_users
  end

  def edit
    bid = @homework.bid
    if (bid.comment_status == 0 || bid.open_anonymous_evaluation == 0) && (User.current.admin? || User.current.member_of_course?(bid.courses.first))
      get_homework_member @homework
    else
      render_403 :message => :notice_not_authorized
    end
  end

  def update
    #@homework = HomeworkAttach.find(params[:id])
    course = @homework.bid.courses.first
    if User.current.admin? || User.current.member_of_course?(course)
      name = params[:homework_name]
      description = params[:homework_description]
      @homework.name = name
      @homework.description = description
      @homework.project_id = params[:project_id] || 0
      if params[:attachments]
        @homework.save_attachments(params[:attachments])
      end
      if @homework.save
        respond_to do |format|
          format.html { redirect_to course_for_bid_url @homework.bid }
          format.json { head :no_content }
        end
      else
      end
    else
      render_403 :message => :notice_not_authorized
    end
  end

  def destroy
    bid = @homework.bid
    if (bid.comment_status == 0 || bid.open_anonymous_evaluation == 0) && (User.current.admin? || User.current == @homework.user)
      if @homework.destroy
        #respond_to do |format|
        #  format.html { redirect_to course_for_bid_url @homework.bid }
        #  format.json { head :no_content }
        #end
        @homework_list = []
        @is_my_homework = true
        respond_to do |format|
          format.js
        end
      else
      end
    else
      render_403
    end
  end

  #显示作业信息
  def show
    if User.current.admin? || User.current.member_of_course?(@course)
      # 作业打分列表
      @stars_reates = @homework.rates(:quality)
      #我的评分
      @is_teacher = is_course_teacher User.current,@course
      @has_evaluation = @stars_reates.where("rater_id = #{User.current.id} and is_teacher_score=#{@is_teacher ? 1 : 0}").first
      @m_score = @has_evaluation.nil? ? 0 : @has_evaluation.stars
      @teacher_stars = @stars_reates.where("is_teacher_score = 1") #老师评分列表
      @student_stars = @stars_reates.where("is_teacher_score = 0") #学生评分列表
      @is_anonymous_comments = @bid.comment_status == 1 && !@homework.users.include?(User.current) && @homework.user != User.current && !@is_teacher #判断是不是匿评(开启匿评，当前用户不是作业的创建者或者参与者，不是老师)
      jours = @homework.journals_for_messages.where("is_comprehensive_evaluation = 3 or is_comprehensive_evaluation is null").order("created_on DESC")#jours留言 is null条件用以兼容历史数据
      @jour = paginateHelper jours,5 #留言
      @cur_page = params[:cur_page] || 1
      @cur_type = params[:cur_type] || 5

      respond_to do |format|
        format.html
        format.js
      end
    else
      render_403 :message => :notice_not_authorized
    end
  end

  #删除留言
  def destroy_jour
    @homework = HomeworkAttach.find(params[:homework_id])
    @journal_destroyed = JournalsForMessage.find(params[:object_id])
    if @journal_destroyed.is_comprehensive_evaluation == 3 && @journal_destroyed.destroy
      render_403 unless User.current == @journal_destroyed.user || User.current.admin?
      @stars_reates = @homework.rates(:quality)
      @teacher_stars = @stars_reates.where("is_teacher_score = 1)") #老师评分列表
      @student_stars = @stars_reates.where("is_teacher_score = 0") #学生评分列表
      jours = @homework.journals_for_messages.where("is_comprehensive_evaluation = 3 or is_comprehensive_evaluation is null").order("created_on DESC")#jours留言 is null条件用以兼容历史数据
      @jour = paginateHelper jours,5 #留言
    else
      render_404
    end

    #@course=@homework.bid.courses.first
    #@journal_destroyed = JournalsForMessage.find(params[:object_id])
    #@is_comprehensive_evaluation = @journal_destroyed.is_comprehensive_evaluation
    #@journal_destroyed.destroy
    #if @is_comprehensive_evaluation == 3
    #  @jours = @homework.journals_for_messages.where("is_comprehensive_evaluation = 3 or is_comprehensive_evaluation is null").order("created_on DESC")
    #  @jour = paginateHelper @jours,5
    #elsif @is_comprehensive_evaluation == 2
    #  annymous_users = @homework.homework_evaluations.map { |homework_evaluation| homework_evaluation.user.id}.join(',')
    #  unless annymous_users.nil? || annymous_users.count == ""
    #    @anonymous_comments = @homework.journals_for_messages.where("is_comprehensive_evaluation = 2 and user_id in (#{annymous_users})").order("created_on DESC")
    #  end
    #elsif @is_comprehensive_evaluation == 1
    #  teachers = searchTeacherAndAssistant @course
    #  @comprehensive_evaluation = []
    #  teachers.each do|teacher|
    #    temp = @homework.journals_for_messages.where("is_comprehensive_evaluation = 1 and user_id = #{teacher.user_id}").order("created_on DESC").first
    #    @comprehensive_evaluation << temp if temp
    #  end
    #end
    respond_to do |format|
      format.js
    end
  end

  #添加留言
  def addjours
    @is_teacher,@is_anonymous_comments,@m_score = params[:is_teacher]=="true",params[:is_anonymous_comments]=="true",params[:stars_value]
    @cur_page,@cur_type = params[:cur_page] || 1,params[:cur_type] || 5
    @homework = HomeworkAttach.find(params[:homework_id])
    is_teacher = @is_teacher ? 1 : 0
    #保存评分@homework.rate(@m_score.to_i,User.current.id,:quality, (@is_teacher ? 1 : 0))
    if @m_score
      rate = @homework.rates(:quality).where(:rater_id => User.current.id, :is_teacher_score => is_teacher).first
      if rate
        rate.stars = @m_score
        rate.save!
      else
        @homework.rates(:quality).new(:stars => @m_score, :rater_id => User.current.id, :is_teacher_score => is_teacher).save!
      end
    end
    #保存评论
    @is_comprehensive_evaluation = @is_teacher ? 1 : (@is_anonymous_comments ? 2 : 3) #判断当前评论是老师评论？匿评？留言
    if params[:new_form] && params[:new_form][:user_message] && params[:new_form][:user_message] != ""  #有没有留言
      @homework.addjours User.current.id, params[:new_form][:user_message],0,@is_comprehensive_evaluation
    end

    @stars_reates = @homework.rates(:quality)
    @teacher_stars = @stars_reates.where("is_teacher_score = 1") #老师评分列表
    @student_stars = @stars_reates.where("is_teacher_score = 0") #学生评分列表
    jours = @homework.journals_for_messages.where("is_comprehensive_evaluation = 3 or is_comprehensive_evaluation is null").order("created_on DESC")#jours留言 is null条件用以兼容历史数据
    @jour = paginateHelper jours,5 #留言

    if @cur_type == "1" #如果当前是老师未批列表，需要刷新整个作业列表界面
      @bid = @homework.bid
      get_not_batch_homework_list "s_socre","desc",@homework.bid_id
    elsif @cur_type == "2" #老师已批列表
      @result_homework = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1 and stars IS NOT NULL) AS t_score,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
            FROM homework_attaches WHERE id = #{@homework.id}").first
    elsif @cur_type == "3" #全部作业列表
      @result_homework = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
            (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
            FROM homework_attaches WHERE id = #{@homework.id}").first
    elsif @cur_type == "4" #匿评作业列表
      @is_student_batch_homework = true
      @result_homework = HomeworkAttach.find_by_sql("SELECT homework_attaches.*,
          (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
          (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score,
          (SELECT stars FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND rater_id = #{User.current.id}  AND is_teacher_score = #{is_teacher}) AS m_score
          FROM homework_attaches
          WHERE homework_attaches.id = #{@homework.id}").first
    else #其他的不用管

    end
    respond_to do |format|
      format.js
    end
  end

  #教师综评
  def comprehensive_evaluation_jour
    @homework = HomeworkAttach.find(params[:jour_id])
    @add_jour = @homework.addjours User.current.id, params[:new_form][:user_message],0,params[:is_comprehensive_evaluation]
    respond_to do |format|
      format.html { redirect_to homework_attach_url @homework }
      format.json { head :no_content }
    end
  end

  #获取指定作业的平均得分
  def score
  end

  #添加回复
  def add_jour_reply
    parent_id = params[:reference_id]
    author_id = User.current.id
    reply_user_id = params[:reference_user_id]
    reply_id = params[:reference_message_id] # 暂时不实现
    content = params[:user_notes]
    options = {:user_id => author_id,
               :m_parent_id => parent_id,
               :m_reply_id => reply_id,
               :reply_id => reply_user_id,
               :notes => content,
               :is_readed => false}
    @jfm = JournalsForMessage.new(options)
    @jfm.save
    respond_to do |format|
      format.js{
        @save_succ = true if @jfm.errors.empty?
      }
    end
  end

  private
  #验证是否显示课程
  def can_show_course
    @first_page = FirstPage.find_by_page_type('project')
    if @first_page.show_course == 2
      render_404
    end
  end

  def find_bid_and_course
    @bid = Bid.find(params[:bid_id])
    @course = @bid.courses.first
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  def find_course_by_bid_id
    @bid = Bid.find(params[:id])
    @course = @bid.courses.first
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  def find_course_by_hoemwork_id
    @homework = HomeworkAttach.find(params[:id])
    @bid = @homework.bid
    @course = @bid.courses.first
  rescue ActiveRecord::RecordNotFound
    render_404
  end

  #获取课程的老师列表
  def find_course_teachers course
    searchTeacherAndAssistant(course).map{|teacher| teacher.user_id}.join(",")
  end

  #获取作业教师评分所占比例
  def get_teacher_proportion bid
    if bid.proportion
      teacher_proportion = bid.proportion * 1.0 / 100
    else
      teacher_proportion = 1.0
    end
    teacher_proportion
  end

  def get_not_batch_homework_list sort,direction,bid_id
    if sort == 't_socre'
      order_by = "t_score  #{direction}"
    elsif sort == 's_socre'
      order_by = "s_score  #{direction}"
    elsif sort == 'time'
      order_by = "created_at #{direction}"
    end
    @all_homework_list = HomeworkAttach.eager_load(:attachments,:user,:rate_averages).find_by_sql("SELECT * FROM (SELECT homework_attaches.*,
        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 1) AS t_score,
        (SELECT AVG(stars) FROM seems_rateable_rates WHERE rateable_type = 'HomeworkAttach' AND rateable_id = homework_attaches.id AND is_teacher_score = 0) AS s_score
        FROM homework_attaches WHERE bid_id = #{bid_id}
        ORDER BY #{order_by}) AS table1
        WHERE table1.t_score IS NULL")
    @homework_list = paginateHelper @all_homework_list,10
  end

  #获取指定作业的所有成员
  def users_for_homework homework
    homework.nil? ? [] : (homework.users + [homework.user])
  end

  def homework_to_csv items
    encoding = l(:general_csv_encoding)
    columns = ["student_id","user_name","login","student_num","mail","work_name","teacher_score","ni_score","commit_time"]


    export = FCSV.generate(:col_sep => l(:general_csv_separator)) do |csv|
      # csv header fields
      csv << columns.collect {|c| Redmine::CodesetUtil.from_utf8(c, encoding) }
      # csv lines
      items.each do |homework|
        csv << [homework.user.id,Redmine::CodesetUtil.from_utf8(homework.user.lastname.to_s + homework.user.firstname.to_s, encoding),Redmine::CodesetUtil.from_utf8(homework.user.login, encoding),
                Redmine::CodesetUtil.from_utf8(homework.user.user_extensions.student_id, encoding),Redmine::CodesetUtil.from_utf8(homework.user.mail, encoding),Redmine::CodesetUtil.from_utf8(homework.name, encoding),
                Redmine::CodesetUtil.from_utf8((homework.t_score.nil? || (homework.t_score && homework.t_score.to_i == 0)) ? l(:label_without_score) : format("%.2f",homework.t_score), encoding),
                Redmine::CodesetUtil.from_utf8( homework.s_score.nil? ? l(:label_without_score) : format("%.2f",homework.s_score), encoding),Redmine::CodesetUtil.from_utf8(format_time(homework.created_at), encoding)]
      end
    end
    export
  end

  def homework_to_xls items
    xls_report = StringIO.new
    book = Spreadsheet::Workbook.new
    sheet1 = book.create_worksheet :name => "homework"

    blue = Spreadsheet::Format.new :color => :blue, :weight => :bold, :size => 10
    sheet1.row(0).default_format = blue

    sheet1.row(0).concat([l(:excel_user_id),l(:excel_user_name),l(:excel_nickname),l(:excel_student_id),l(:excel_mail),l(:excel_homework_name),
                         l(:excel_t_score),l(:excel_n_score),l(:excel_commit_time)])
    count_row = 1
    items.each do |homework|
      sheet1[count_row,0]=homework.user.id
      sheet1[count_row,1] = homework.user.lastname.to_s + homework.user.firstname.to_s
      sheet1[count_row,2] = homework.user.login
      sheet1[count_row,3] = homework.user.user_extensions.student_id
      sheet1[count_row,4] = homework.user.mail
      sheet1[count_row,5] = homework.name
      sheet1[count_row,6] =(homework.t_score.nil? || (homework.t_score && homework.t_score.to_i == 0)) ? l(:label_without_score) : format("%.2f",homework.t_score)
      sheet1[count_row,7] = homework.s_score.nil? ? l(:label_without_score) : format("%.2f",homework.s_score)
      sheet1[count_row,8] = format_time(homework.created_at)
      count_row += 1
    end

    book.write xls_report
    xls_report.string
  end
end