socialforge/app/controllers/courses_controller.rb

class CoursesController < ApplicationController
  # layout 'base_courses'
  include CoursesHelper
  include ActivitiesHelper
  helper :activities
  helper :members
  helper :words
  helper :attachments
  helper :activity_notifys

  before_filter :auth_login1, :only => [:show, :feedback]
  menu_item :overview
  menu_item :feedback, :only => :feedback
  menu_item :homework, :only => :homework

  menu_item :new_homework, :only => :new_homework

  menu_item l(:label_sort_by_time), :only => :index
  menu_item l(:label_sort_by_active), :only => :index
  menu_item l(:label_sort_by_influence), :only => :index

  before_filter :can_show_course, :except => []
  before_filter :logged_user_by_apptoken,:only => [:show,:new_homework,:feedback]
  before_filter :find_course, :except => [ :index, :search,:list, :new,:join,:unjoin, :create, :copy, :statistics, :new_join, :course, :enterprise_course, :course_enterprise,:view_homework_attaches,:join_private_courses]
  before_filter :authorize_course, :only => [:show, :settings, :edit, :update, :modules, :close, :reopen, :view_homework_attaches, :course]
  before_filter :authorize_course_global, :only => [:view_homework_attaches, :new,:create]
  before_filter :require_admin, :only => [:copy, :archive, :unarchive, :destroy, :calendar]
  before_filter :toggleCourse, :only => [:finishcourse, :restartcourse]

  before_filter :require_login, :only => [:join, :unjoin]
  #before_filter :allow_join, :only => [:join]

  def join
    if User.current.logged?
      cs = CoursesService.new
      user = User.current
      join = cs.join_course params,user
      @state = join[:state]
      course = join[:course]
    else
      @state = 5 #未登录
    end
    respond_to do |format|
      format.js { render :partial => 'set_join', :locals => {:user => user, :course => course, :object_id => params[:object_id]} }
    end
  rescue Exception => e
    @state = 4 #已经加入了课程
    respond_to do |format|
      format.js { render :partial => 'set_join', :locals => {:user => User.current, :course => nil, :object_id => nil} }
    end
  end

  def unjoin
    if User.current.logged?
      cs = CoursesService.new
      cs.exit_course params,User.current
    end
    respond_to do |format|
      format.js { render :partial => 'set_join', :locals => {:user => User.current, :course => Course.find(params[:object_id]), :object_id => params[:object_id]} }
    end
  end

  
  def join_private_courses
    respond_to do |format|
      format.js
    end
  end

  #更新课程信息
  def update
    cs = CoursesService.new
    c = cs.edit_course params,@course,User.current
    @course = c[:course]
    if @course.errors.full_messages.count <= 0
        respond_to do |format|
          format.html {
            # render :layout => 'base_courses'
            flash[:notice] = l(:notice_successful_update)
            redirect_to settings_course_url(@course)
          }
          format.api  { render_api_ok }
        end
    else
      respond_to do |format|
        format.html {
          settings
          redirect_to settings_course_url(@course)
        }
        format.api  { render_validation_errors(@course) }
      end
    end
  end

  def new_join
    @course = Course.find(params[:object_id])
  end

  # 课程搜索
  # add by nwb
  def search
    courses_all = Course.all_course
    name = params[:name]
    if name.blank?
      @courses = []
      @courses_all = []
      @course_count = 0
      @course_pages = Paginator.new @course_count, per_page_option, params['page']
    else
      @courses = courses_all.visible
      if params[:name].present?
        @courses_all = @courses.like(params[:name])
      else
        @courses_all =  @courses;
      end
      @course_count = @courses_all.count
      @course_pages = Paginator.new @course_count, per_page_option, params['page']

      # 课程的动态数
      @course_activity_count=Hash.new
      @courses_all.each do |course|
        @course_activity_count[course.id]=0
      end

      case params[:course_sort_type]
        when '0'
          @courses =  @courses_all.order("created_at desc")
          @s_type = 0
          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)

          @course_activity_count=get_course_activity @courses,@course_activity_count

        when '1'
          @courses = @courses_all.order("course_ac_para desc")
          @s_type = 1
          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)

          @course_activity_count=get_course_activity @courses,@course_activity_count

        when '2'
          @courses = @courses_all.order("watchers_count desc")
          @s_type = 2
          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)

          @course_activity_count=get_course_activity @courses,@course_activity_count

        when '3'
          @course_activity_count=get_course_activity @courses_all,@course_activity_count_array
          @courses=handle_course @courses_all,@course_activity_count
          @s_type = 3
          @courses =  @courses[@course_pages.offset, @course_pages.per_page]

        else
          @s_type = 0
          @courses = @courses_all.order("created_at desc")
          @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)

          @course_activity_count=get_course_activity @courses,@course_activity_count

      end
    end

    respond_to do |format|
      format.html {
        render :layout => 'course_base'
        scope = Course
        unless params[:closed]
          scope = scope.active
        end
      }
      format.atom {
        courses = Course.visible.order('created_on DESC').limit(Setting.feeds_limit.to_i).all
        render_feed(courses, :title => "#{Setting.app_title}: #{l(:label_course_latest)}")
      }
    end

  rescue Exception => e
    if e.message == 'sumbit empty'
      (redirect_to courses_url, :notice => l(:label_sumbit_empty);return)
    end
  end

  def searchmembers
    @subPage_title = l :label_student_list
    @canShowCode = User.current.allowed_to?(:as_teacher,@course) && params[:role] != '1'
    # @is_remote = true
    @score_sort_by = "desc"
    q = "#{params[:name].strip}"
    if params[:incourse]
      results = searchmember_by_name(student_homework_score(0,0,0,"desc"), q)
    elsif params[:ingroup]
      @group = CourseGroup.find(params[:search_group_id])
      results = searchmember_by_name(student_homework_score(@group.id,0,0,"desc"), q)
    end
    @is_remote = true
    #@result_count = results.count
    #@results = paginateHelper results, 10
    @results = results
    @search_name = q
  end

  def addgroups
    @subPage_title = l :label_student_list
    if params[:group_name]
      group = CourseGroup.new
      group.name = params[:group_name]
      group.course_id = @course.id
      group.save
    end
    @canShowCode = User.current.allowed_to?(:as_teacher,@course) && params[:role] != '1'
    @is_remote = true

    @course_groups = @course.course_groups
  end

  def deletegroup
    CourseGroup.delete(params[:group_id])
    @subPage_title = l :label_student_list
    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
    @is_remote = true

    @course_groups = @course.course_groups
  end

  def updategroupname
    @subPage_title = l :label_student_list
    if params[:group_name]
      group = CourseGroup.find(params[:group_id])
      group.name = params[:group_name]
      group.save
    end
    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
    @is_remote = true

    @course_groups = @course.course_groups
  end

  def  valid_ajax
    req = Hash.new(false)
    req[:message] = ''

    valid_attr = params[:valid]
    valid_value = params[:value]
    group_id = params[:group_id]
    # faker = CourseGroup.new

    if valid_attr.eql?('name')
      course = Course.find params[:course_id]
      group_names = course.course_groups.map{|group| group.name unless group.id.to_s == group_id}.select{|group| !group.nil?}
      if group_names.include?(valid_value)
        req[:valid] = false
        req[:message] = l(:modal_valid_unpassing)
      else
        req[:valid] = true
        req[:message] = l(:modal_valid_passing)
      end
      # faker.name = valid_value
      # faker.course_id =  params[:course_id]
      # faker.valid?
      # req[:valid] = faker.errors[:name].blank?
      # req[:message] = faker.errors[:name]
    end
    # req[:message] = l(:modal_valid_passing) if req[:message].blank?
    render :json => req
  end
  def join_group
    @subPage_title = l :label_student_list
    group = CourseGroup.find(params[:object_id])
    member = Member.where(:course_id => @course.id, :user_id => User.current.id).first
    member.course_group_id = group.id
    member.save
    @group = group

    @course_groups = @course.course_groups

    search_group_members group
  end
  def unjoin_group
    @subPage_title = l :label_student_list
    group = CourseGroup.find(params[:object_id])
    member = Member.where(:course_id => @course.id, :user_id => User.current.id).first
    member.course_group_id = 0
    member.save
    @group = group
    @course_groups = @course.course_groups

    search_group_members group
  end
  def searchgroupmembers
    @subPage_title = l :label_student_list
    @render_file = 'new_member_list'
    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
    @is_remote = true
    @score_sort_by = "desc"
    if params[:group_id] && params[:group_id] != "0"
      @group = CourseGroup.find(params[:group_id])
      @results = student_homework_score(@group.id,0, 0,"desc")
      @results = paginateHelper @results, 10
    else
      page_from = params[:page].nil? ? 0 : (params[:page].to_i - 1)
      @results = student_homework_score(0,page_from, 10,"desc")
    end
  end

  def member
    ## 有角色参数的才是课程，没有的就是项目
    if (User.current.admin? || @course.is_public == 1 || (@course.is_public == 0 && User.current.member_of_course?(@course)))
      
      @render_file = 'new_member_list'
      @score_sort_by = "desc"
      @canShowCode = User.current.allowed_to?(:as_teacher,@course) && params[:role] != '1'
      @role = params[:role].nil? ?  '2':params[:role]
      @is_remote = true
      @course_groups = @course.course_groups if @course.course_groups
      @show_serch = params[:role] == '2'
      case @role
        when '1'
          @subPage_title = l :label_teacher_list
          @all_members = searchTeacherAndAssistant(@course)
          @members =  @all_members
        when '2'
          @subPage_title = l :label_student_list
          page = params[:page].nil? ? 0 : (params['page'].to_i - 1)
          @all_members = student_homework_score(0,page, 10,"desc")
          @members =  @all_members
      end
      respond_to do |format|
        if params[:page]
          format.html {render :layout => 'base_courses'}
          format.js
        else
          format.html {render :layout => 'base_courses'}
        end
      end
    else
      render_403
    end
  end

  def export_course_member_excel
    @all_members = student_homework_score(0,0,0,"desc")
    filename="#{@course.teacher.lastname.to_s + @course.teacher.firstname.to_s }_#{@course.name}_#{@course.time.to_s + @course.term}#{l(:excel_member_list)}";
    # 如果是ie11 需要转码
    if(/rv\:11\.0/.match(request.env["HTTP_USER_AGENT"]) != nil)
      filename= URI::encode(filename)
    end
    respond_to do |format|
      format.xls {
        send_data(member_to_xls(@all_members,@course.course_groups), :type => "text/excel;charset=utf-8; header=present",
                  :filename => "#{filename}.xls")
      }
    end
  end

  def member_score_sort
    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
    @subPage_title = l :label_student_list
    @render_file = 'new_member_list'
    @is_remote = true
    @score_sort_by = params[:sort_by] if params[:sort_by]
    @search_name = params[:search_name] if params[:search_name]
    group_id = params[:group_id]
    if !@search_name.nil?
      if group_id == '0'
        page = params[:page].nil? ? 0 : (params['page'].to_i - 1)
        @results = searchmember_by_name(student_homework_score(0,0,0,@score_sort_by), @search_name)
        @result_count = @results.count
        @results = paginateHelper @results, 10
      else
        @group = CourseGroup.find(group_id)
        @results = searchmember_by_name(student_homework_score(group_id, 0, 0,@score_sort_by),@search_name)
        @result_count = @results.count
        @results = paginateHelper @results, 10
      end
    else
      if group_id == '0'
        page = params[:page].nil? ? 0 : (params['page'].to_i - 1)
        @results = student_homework_score(0,page, 10,@score_sort_by)
      else
        @group = CourseGroup.find(group_id)
        @results = student_homework_score(group_id, 0, 0,@score_sort_by)
      end
    end
  end
  # 显示每个学生的作业评分详情
  def show_member_score
    @member_score = Member.find(params[:member_id]) if params[:member_id]
    respond_to do |format|
      format.html {render :layout => 'course_base'}
      format.js
    end
  end

  def handle_course courses, activities
    course_activity_count_array=activities.values()
    course_array=[]
    i=0;
    courses.each do |course|
      course_array[i]=course
      i=i+1
    end
    courses=desc_sort_course_by_avtivity(course_activity_count_array, course_array)
    return courses
  end

  def settings
    if User.current.allowed_to?(:as_teacher,@course)
      @issue_custom_fields = IssueCustomField.sorted.all
      @issue_category ||= IssueCategory.new
      @member ||= @course.members.new
      @trackers = Tracker.sorted.all

      @roles = Role.givable.all[3..5]
      @members = @course.member_principals.includes(:roles, :principal).all.sort
      respond_to do |format|
        format.html { render :layout => 'base_courses' }
        format.api { render_validation_errors(@course) }
      end
    else
      render_403
    end

  end

  def search_member
    if User.current.allowed_to?(:as_teacher,@course) || User.current.admin
      q = "#{params[:name].strip}"
      @roles = Role.givable.all[3..5]
      if q.nil? || q == ""
        @members = @course.member_principals.includes(:roles, :principal).all.sort
      else
        @members = searchmember_by_name(@course.member_principals.includes(:roles, :principal).all.sort,q)
      end

    else
      render_403
    end
  end

  def create
    cs = CoursesService.new
    @course = cs.create_course(params,User.current)[:course]
    if @course.new_record?
      respond_to do |format|
        format.html { render :action => 'new', :layout => 'new_base' } #Added by young
        format.api { render_validation_errors(@course) }
      end
    else
      respond_to do |format|
              format.html {
                # render :layout => 'base_courses'
                flash[:notice] = l(:notice_successful_create)
                if params[:continue]
                  redirect_to new_course_url(attrs, :course => '0')
                elsif params[:course_continue]
                  redirect_to new_course_url(:course => '1')
                else
                  redirect_to settings_course_url(@course, :course_type => 1)
                end
              }
              format.api { render :action => 'show', :status => :created, :location => url_for(:controller => 'courses', :action => 'show', :id => @course.id) }
            end
    end
  end

  def course
     @school_id = params[:school_id]
    per_page_option = 10
    if @school_id == "0" or @school_id.nil?
      @courses_all = Course.active.visible.
          joins("LEFT JOIN #{CourseStatus.table_name} ON #{Course.table_name}.id = #{CourseStatus.table_name}.course_id")
    else
      @courses_all = Course.active.visible.
          joins("LEFT JOIN #{CourseStatus.table_name} ON #{Course.table_name}.id = #{CourseStatus.table_name}.course_id").
          joins(:course_extra).
          where("#{Course.table_name}.school_id = ?", @school_id)
    end

    @course_count = @courses_all.count
    @course_pages = Paginator.new @course_count, per_page_option, params['page']
    @course_activity_count=Hash.new
    @courses_all.each do |course|
      @course_activity_count[course.id]=0
    end
    case params[:course_sort_type]
      when '0'
        @courses =  @courses_all.order("created_on desc")
        @s_type = 0
        @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses,@course_activity_count
      when '1'
        @courses = @courses_all.order("course_ac_para desc")
        @s_type = 1
        @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses,@course_activity_count
      when '2'
        @courses = @courses_all.order("watchers_count desc")
        @s_type = 2
        @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses,@course_activity_count
      when '3'
        @course_activity_count=get_course_activity @courses_all,@course_activity_count
        @courses=handle_course @courses_all,@course_activity_count
        @s_type = 3
        @courses =  @courses[@course_pages.offset, @course_pages.per_page]
      else
        @s_type = 0
        @courses = @courses_all.order("created_on desc")
        @courses =  @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses,@course_activity_count
    end

    respond_to do |format|
      format.html {
        render :layout => 'new_base'
      }
      format.api  {
      }
      format.atom {
        courses = Course.visible.order('created_on DESC').limit(Setting.feeds_limit.to_i).all
        render_feed(courses, :title => "#{Setting.app_title}: #{l(:label_course_latest)}")
      }
    end
  end

  def new
    @course_type = params[:course_type] ||= params[:course]
    @issue_custom_fields = IssueCustomField.sorted.all
    @trackers = Tracker.sorted.all
    @course = Course.new
    @course.safe_attributes = params[:course]
    month = Time.now.month
    render :layout => 'new_base'
  end

  def desc_sort_course_by_avtivity(activity_count, courses)
    return courses if activity_count.size<2
    (activity_count.size-2).downto(0) do |i|
      (0..i).each do |j|
        if activity_count[j]<activity_count[j+1]
          courses[j], courses[j+1]=courses[j+1], courses[j]
          activity_count[j], activity_count[j+1]=activity_count[j+1], activity_count[j]
        end
      end
    end
    return courses
  end

  def index
    if !User.current.admin?
       render_404
       return
    end
    @course_type = params[:course_type]
    @school_id = params[:school_id]
    per_page_option = 10
    if @school_id == "0" || @school_id.nil?
      @courses_all = Course.active.visible.
          joins("LEFT JOIN #{CourseStatus.table_name} ON #{Course.table_name}.id = #{CourseStatus.table_name}.course_id")
    else
      @courses_all = Course.active.visible.
          joins("LEFT JOIN #{CourseStatus.table_name} ON #{Course.table_name}.id = #{CourseStatus.table_name}.course_id").
          where("#{Course.table_name}.school_id = ?", @school_id)
    end
    @course_count = @courses_all.count
    @course_pages = Paginator.new @course_count, per_page_option, params['page']
    @course_activity_count=Hash.new
    @courses_all.each do |course|
      @course_activity_count[course.id]=0
    end
    case params[:course_sort_type]
      when '0'
        @courses = @courses_all.order("created_at desc")
        @s_type = 0
        @courses = @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses, @course_activity_count
      when '1'
        @courses = @courses_all.order("course_ac_para desc")
        @s_type = 1
        @courses = @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses, @course_activity_count
      when '2'
        @courses = @courses_all.order("watchers_count desc")
        @s_type = 2
        @courses = @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses, @course_activity_count
      when '3'
        @course_activity_count=get_course_activity @courses_all, @course_activity_count
        @courses=handle_course @courses_all, @course_activity_count
        @s_type = 3
        @courses = @courses[@course_pages.offset, @course_pages.per_page]
      else
        @s_type = 0
        @courses = @courses_all.order("created_at desc")
        @courses = @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
        @course_activity_count=get_course_activity @courses, @course_activity_count
    end

    respond_to do |format|
      format.html {
         render :layout => 'base'
      }
      format.atom {
        courses = Course.visible.order('created_on DESC').limit(Setting.feeds_limit.to_i).all
        render_feed(courses, :title => "#{Setting.app_title}: #{l(:label_course_latest)}")
      }
    end
  end

  def toggleCourse
    @course_prefs = Course.find_by_extra(@course.extra)
    unless (@course_prefs.teacher == User.current || User.current.admin?)
      render_403
    end
  end

  def get_courses
    @user = User.current
    membership = @user.coursememberships.all
    membership.sort! {|older, newer| newer.created_on <=> older.created_on }
    @memberships = []
    membership.collect { |e|
      @memberships.push(e)
    }
    @memberships_doing = []
    @memberships_done  = []
    now_time = Time.now.year
    @memberships.map { |e|
      end_time = e.course.get_time.year
      isDone = course_endTime_timeout?(e.course)
      if isDone
        @memberships_done.push e
      else
        @memberships_doing.push e
      end
    }
  end

  def finishcourse
    yesterday = Date.today.prev_day.to_time
    @course_prefs.endup_time = yesterday
    @save_flag = @course_prefs.save
    get_courses

    respond_to do |format|
      format.js
    end
  end


  def restartcourse
    day = Time.parse("3000-01-01")

    @course_prefs.endup_time = day
    @save_flag = @course_prefs.save
    get_courses

    respond_to do |format|
      format.js {
        render action:'finishcourse'
      }
    end
  end

  def show
    if params[:jump] && redirect_to_course_menu_item(@course, params[:jump])
      return
    end
    @users_by_role = @course.users_by_role
    if(User.find_by_id(CourseInfos.find_by_course_id(@course.id).try(:user_id)))
      @user = User.find_by_id(CourseInfos.find_by_course_id(@course.id).user_id)
    end
    @key = User.current.rss_key
    #新增内容
    @days = Setting.activity_days_default.to_i
    if params[:from]
      begin; @date_to = params[:from].to_date + 1; rescue; end
    end
    has = {
        "show_course_files" => true,
        "show_course_news" => true,
        "show_course_messages" => true,
        #"show_course_journals_for_messages" => true,
        # "show_bids" => true,
        # "show_homeworks" => true,
        "show_polls" => true
    }
    @date_to ||= Date.today + 1
    @date_from = (@date_to - @days) > @course.created_at.to_date ? (@date_to - @days) : @course.created_at.to_date
    @author = (params[:user_id].blank? ? nil : User.active.find(params[:user_id]))
    if @author.nil?
      # 显示老师和助教的活动
      # @authors = searchTeacherAndAssistant(@course)
      @authors = course_all_member(@course)
      events = []
      @authors.each do |author|
        @activity = Redmine::Activity::Fetcher.new(User.current, :course => @course,
                                                   :with_subprojects => false,
                                                   :author => author.user)

        @activity.scope_select {|t| has["show_#{t}"]}
        # modify by nwb
        # 添加私密性判断
        if User.current.member_of_course?(@course)|| User.current.admin?
          events += @activity.events(@days, @course.created_at)
        else
          events += @activity.events(@days, @course.created_at, :is_public => 1)
        end

      end
    else
    # @author = @course.teacher
      @activity = Redmine::Activity::Fetcher.new(User.current, :course => @course,
                                                 :with_subprojects => false,
                                                 :author => @author)

      @activity.scope_select {|t| has["show_#{t}"]}
      # modify by nwb
      # 添加私密性判断
      if User.current.member_of_course?(@course)|| User.current.admin?
        events = @activity.events(@days, @course.created_at)
      else
        events = @activity.events(@days, @course.created_at, :is_public => 1)
      end
    end

    # 无新动态时，显示老动态
    if events.count == 0
      if User.current.member_of_course?(@course)|| User.current.admin?
        events = @activity.events
      else
        events = @activity.events(:is_public => 1)
      end
    end
    @sort_by = %w(category date title author).include?(params[:sort_by]) ? params[:sort_by] : 'category'
    if(User.find_by_id(CourseInfos.find_by_course_id(@course.id).try(:user_id)))
      @user = User.find_by_id(CourseInfos.find_by_course_id(@course.id).user_id)
    end

    sorted_events = sort_activity_events_course(events)
    events = paginateHelper sorted_events,10
    @events_by_day = events.group_by {|event| User.current.time_to_date(event.event_datetime)}
    #  documents


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

  #判断指定用户是否为课程教师
  def isCourseTeacher(id,course)
    result = false
    user = User.find(id)
    if !user.nil? && user.allowed_to?(:as_teacher,course)
      result = true
    end
    result
  end

  def feedback
    if (User.current.admin? || @course.is_public == 1 || (@course.is_public == 0 && User.current.member_of_course?(@course)))
      page = params[:page]
      # Find the page of the requested reply
      @jours = @course.journals_for_messages.where('m_parent_id IS NULL').order('created_on DESC')
      @limit =  10
      if params[:r] && page.nil?
        offset = @jours.count(:conditions => ["#{JournalsForMessage.table_name}.id > ?", params[:r].to_i])
        page = 1 + offset / @limit
      end
      @jour = paginateHelper @jours,10
      @state = false
      respond_to do |format|
        format.html{render :layout => 'base_courses'}
        format.api
      end
    else
      render_403
    end
  end

  #根据已有课程复制课程
  #param id:已有课程ID
  def copy_course
    if @course
      @new_course = Course.new @course.attributes
      @new_course.tea_id = User.current.id
      @new_course.created_at = DateTime.now
      @new_course.updated_at = DateTime.now
      @new_course.endup_time = nil
      if @new_course.save
        r = Role.givable.find_by_id(Setting.new_project_user_role_id.to_i) || Role.givable.first
        m = Member.new(:user => User.current, :roles => [r])
        m.project_id = -1
        course = CourseInfos.new(:user_id => User.current.id, :course_id => @new_course.id)
        #user_grades = UserGrade.create(:user_id => User.current.id, :course_id => @course.id)
        if @new_course.is_public == 1
          course_status = CourseStatus.create(:course_id => @new_course.id, :watchers_count => 0, :changesets_count => 0, :grade => 0, :course_type => 1)
        end
        @new_course.members << m
        @new_course.course_infos << course
        redirect_to settings_course_url @new_course
      end
    else
      render_404
    end
  end

  private
  def allow_join course
    if course_endTime_timeout? course
      respond_to do |format|
        format.js {
          @state = 2
          render :partial => 'set_join',
                 :locals => {:user => User.current,
                             :course => Course.find(params[:object_id]),
                             :object_id => params[:object_id]
                 }
        }
      end
    end
  end

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

  def student_homework_score(groupid,start_from, nums, score_sort_by)
    start_from = start_from * nums
    sql_select = ""
    if groupid == 0
      sql_select = "SELECT members.*,(
          SELECT AVG(student_works.final_score)
          FROM student_works,homework_commons
          WHERE student_works.homework_common_id = homework_commons.id
          AND homework_commons.course_id = #{@course.id}
          AND student_works.user_id = members.user_id
        ) AS score
        FROM members
        JOIN students_for_courses
        ON students_for_courses.student_id = members.user_id AND students_for_courses.course_id = members.course_id
        WHERE members.course_id = #{@course.id} ORDER BY score #{score_sort_by}"
    else
      sql_select = "SELECT members.*,(
          SELECT AVG(student_works.final_score)
          FROM student_works,homework_commons
          WHERE student_works.homework_common_id = homework_commons.id
          AND homework_commons.course_id = #{@course.id}
          AND student_works.user_id = members.user_id
        ) AS score
        FROM members
        JOIN students_for_courses
        ON students_for_courses.student_id = members.user_id AND students_for_courses.course_id = members.course_id
        WHERE members.course_id = #{@course.id} AND members.course_group_id = #{groupid} ORDER BY score #{score_sort_by}"
    end
    sql = ActiveRecord::Base.connection()
    homework_scores = Member.find_by_sql(sql_select)
    sql.close()

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

  #当加入，退出分班时查询分班的学生
  def search_group_members group
    @subPage_title = l :label_student_list
    @render_file = 'new_member_list'
    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
    @is_remote = true
    @score_sort_by = "desc"
    page_from = params[:page].nil? ? 0 : (params[:page].to_i - 1)
    @results = student_homework_score(group.id,0,0, "desc")

  end

  def member_to_xls members,groups
    xls_report = StringIO.new
    book = Spreadsheet::Workbook.new
    sheet1 = book.create_worksheet :name => "student"

    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_score)])
    count_row = 1
    group0 = CourseGroup.new();
    group0.id = 0;
    group0.name = l(:excel_member_with_out_class)
    groups_dup = groups.dup
    groups_dup << group0
    groups_dup.each do |group|
      sheet1[count_row,0] = l(:excel_class)
      sheet1[count_row,1] = group.name
      count_row += 1
      members.each do |member|
        if member.course_group_id == group.id
          sheet1[count_row,0]= member.user.id
          sheet1[count_row,1] = member.user.lastname.to_s + member.user.firstname.to_s
          sheet1[count_row,2] = member.user.login
          sheet1[count_row,3] = member.user.user_extensions.student_id
          sheet1[count_row,4] = member.user.mail
          sheet1[count_row,5] = format("%0.2f",member.score.nil? ? 0:member.score.to_s)
          count_row += 1
        end
      end
    end
    book.write xls_report
    xls_report.string
  end

end