class CoursesController < ApplicationController
  include CoursesHelper
  helper :activities
  helper :members

  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 :find_course, :except => [ :index, :search,:list, :new, :create, :copy, :statistics, :new_join, :course, :enterprise_course, :course_enterprise,:view_homework_attaches]
  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?
      course = Project.find(params[:object_id])
      course_prefs = Course.find_by_extra(course.identifier)
      if params[:course_password] == course_prefs.password
        members = []
        members << Member.new(:role_ids => [10], :user_id => User.current.id)
        course.members << members

        StudentsForCourse.create(:student_id => User.current.id, :course_id => params[:object_id])
        @state = 0
      else
        @state = 1
      end
    end
    respond_to do |format|
      # format.html { redirect_to_referer_or {render :text => (watching ? 'Watcher added.' : 'Watcher removed.'), :layout => true}}
      format.js { render :partial => 'set_join', :locals => {:user => User.current, :course => Project.find(params[:object_id]), :object_id => params[:object_id]} }
    end
  end

  def unjoin
    if User.current.logged?

      @member = Member.where('project_id = ? and user_id = ?', params[:object_id], User.current.id)
      @member.first.destroy

      joined = StudentsForCourse.where('student_id = ? and course_id = ?', User.current.id, params[:object_id])
      joined.each do |join|
        join.delete
      end
    end
    respond_to do |format|
      # format.html { redirect_to_referer_or {render :text => (watching ? 'Watcher added.' : 'Watcher removed.'), :layout => true}}
      format.js { render :partial => 'set_join', :locals => {:user => User.current, :course => Project.find(params[:object_id]), :object_id => params[:object_id]} }
    end
  end

  def update
    @course.safe_attributes = params[:course]
    @course.class_period = params[:class_period]
    if  @course.save
      if params[:course][:is_public] == '0'
        course_status = CourseStatus.find_by_course_id(@course.id)
        course_status.destroy if course_status
      elsif params[:course][:is_public] == '1'
        course_status = CourseStatus.create(:course_id => @course.id,  :grade => 0)
      end

      respond_to do |format|
        format.html {
          flash[:notice] = l(:notice_successful_update)
          redirect_to settings_course_path(@course)
        }
        format.api  { render_api_ok }
      end
    else
      respond_to do |format|
        format.html {
          settings
          render :action => 'settings'
        }
        format.api  { render_validation_errors(@course) }
      end
    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
    @issue_custom_fields = IssueCustomField.sorted.all
    @issue_category ||= IssueCategory.new
    @member ||= @course.members.new
    @trackers = Tracker.sorted.all
   end

  def create
    if User.current.user_extensions.identity
      @course = Course.new
      @course.extra='course' + DateTime.parse(Time.now.to_s).strftime('%Y-%m-%d_%H-%M-%S').to_s
      @course.safe_attributes = params[:course]
      @course.tea_id = User.current.id
      # added by bai
      @course.term = params[:term]
      @course.time = params[:time]
      #@course.school_id = params[:occupation]
      @course.school_id = User.current.user_extensions.school_id
      @course.setup_time = params[:setup_time]
      @course.endup_time = params[:endup_time]
      @course.class_period = params[:class_period]
      @course.description = params[:description]
    end

    @issue_custom_fields = IssueCustomField.sorted.all
    @trackers = Tracker.sorted.all

    if User.current.user_extensions.identity == 0
        if  @course.save
        unless User.current.admin?
          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 => @course.id)
          #user_grades = UserGrade.create(:user_id => User.current.id, :course_id => @course.id)
          if params[:course][:is_public] == '1'
            course_status = CourseStatus.create(:course_id => @course.id, :watchers_count => 0, :changesets_count => 0, :grade => 0, :course_type => @course_tag)
          end
          @course.members << m
          @course.course_infos << course
        end
        respond_to do |format|
          format.html {
            flash[:notice] = l(:notice_successful_create)
            if params[:continue]
              redirect_to new_course_path(attrs, :course => '0')
            elsif params[:course_continue]
              redirect_to new_course_path(:course => '1')
            else
              redirect_to settings_course_path(@course, :course_type => 1)
            end
          }
          format.api { render :action => 'show', :status => :created, :location => url_for(:controller => 'courses', :action => 'show', :id => @course.id) }
        end
      else
        @course.destroy
        respond_to do |format|
          format.html { render :action => 'new', :layout => 'base' } #Added by young
          format.api { render_validation_errors(@course) }
        end
      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").
          where("#{Course.table_name}.course_type = ? ", Course::CourseType_course)
    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}.course_type = ?  AND #{Course.table_name}.school_id = ?", Course::CourseType_course, @school_id)
    end

    @course_count = @courses_all.count
    @course_pages = Paginator.new @course_count, per_page_option, params['page']

    #gcm activity count

    @course_activity_count=Hash.new
    #count initialize
    @courses_all.each do |course|
      @course_activity_count[course.id]=0
    end

    #@course_activity_count=get_course_activity @courses_all,@course_activity_count
    #gcm 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)

        #gcm
        @course_activity_count=get_course_activity @courses,@course_activity_count
      #gcmend

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

        #gcm
        @course_activity_count=get_course_activity @courses,@course_activity_count
      #gcmend

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

        #gcm
        @course_activity_count=get_course_activity @courses,@course_activity_count
      #gcmend

      #gcm
      when '3'

        #gcm
        @course_activity_count=get_course_activity @courses_all,@course_activity_count
        #gcmend

        @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)

        #gcm
        @course_activity_count=get_course_activity @courses,@course_activity_count
      #gcmend

    end

    respond_to do |format|
      format.html {
        render :layout => 'base'
      }
      format.api  {
        #        @offset, @limit = api_offset_and_limit
        #        @course_count = Course.visible.count
        #        @courses = Course.visible.offset(@offset).limit(@limit).order('lft').all
      }
      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]

    render :layout => '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
    @course_type = params[:course_type]
    @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}.course_type = ?  AND #{Course.table_name}.school_id = ?", Course::CourseType_course, @school_id)
    end

    @course_count = @courses_all.count
    @course_pages = Paginator.new @course_count, per_page_option, params['page']

    #gcm activity count

    @course_activity_count=Hash.new
    #count initialize
    @courses_all.each do |course|
      @course_activity_count[course.id]=0
    end

    #@course_activity_count=get_course_activity @courses_all,@course_activity_count
    #gcm 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)

        #gcm
        @course_activity_count=get_course_activity @courses, @course_activity_count
      #gcmend

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

        #gcm
        @course_activity_count=get_course_activity @courses, @course_activity_count
      #gcmend

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

        #gcm
        @course_activity_count=get_course_activity @courses, @course_activity_count
      #gcmend

      #gcm
      when '3'

        #gcm
        @course_activity_count=get_course_activity @courses_all, @course_activity_count
        #gcmend

        @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)

        #gcm
        @course_activity_count=get_course_activity @courses, @course_activity_count
      #gcmend

    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 homework
    @offset, @limit = api_offset_and_limit({:limit => 10})
    @bids = @course.homeworks.order('deadline DESC')
    @bids = @bids.like(params[:name]) if params[:name].present?
    @bid_count = @bids.count
    @bid_pages = Paginator.new @bid_count, @limit, params['page']

    @offset ||= @bid_pages.reverse_offset
    unless @offset == 0
      @bids = @bids.offset(@offset).limit(@limit).all.reverse
    else
      limit = @bid_count % @limit
      @bids = @bids.offset(@offset).limit(limit).all.reverse
    end
    render :layout => 'base_courses'
   end

  # 新建作业
  def new_homework
    if (User.current.logged? &&
        (User.current.admin? ||
            (
            !Member.where('user_id = ? and course_id = ?', User.current.id, @course.id).first.nil? &&
                (
                Member.where('user_id = ? and course_id = ?', User.current.id, @course.id).first.roles &&
                    ( Role.where(id: [3, 4, 7, 9]).size > 0 )
                )
            )
        )
    )
      @homework = Bid.new
      @homework.safe_attributes = params[:bid]
      render :layout => 'base_courses'
    else
      render_404
    end

  end

  def get_course_activity courses, activities
    @course_ids=activities.keys()

    days = Setting.activity_days_default.to_i
    date_to ||= Date.today + 1
    date_from = date_to - days-1.years

    #file_count
    Attachment.where(container_id: @course_ids, container_type: Course).where("created_on>?", date_from).each do |attachment|
      activities[attachment.container_id]+=1
    end

    #message_count
    Board.where(course_id: @course_ids).each do |board|
#      activities[board.course_id]+=1
      activities[board.course_id]+=board.messages.where("updated_on>?", date_from).count
    end

    #feedbackc_count
    JournalsForMessage.where(jour_id: @course_ids, jour_type: Course).each do |jourformess|
      activities[jourformess.jour_id]+=1
    end

    #activities!=0
    i=0;
    courses.each do |course|
      id=course.id
      if activities[id]==0
        activities[id]=1
      end
    end

    return activities
  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 finishcourse
    yesterday = Date.today.prev_day.to_time

    @course_prefs.endup_time = yesterday
    @save_flag = @course_prefs.save

    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

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

  def show
     # try to redirect to the requested menu item
    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_files" => true,
        "show_messages" => true,
        "show_bids" => true,
        "show_contests" => true,
        "show_journals_for_messages" => true
    }
    @date_to ||= Date.today + 1
    @date_from = @date_to - @days-1.years
    @author = (params[:user_id].blank? ? nil : User.active.find(params[:user_id]))
    # 决定显示所用用户或单个用户活动
    @activity = Redmine::Activity::Fetcher.new(User.current, :course => @course,
                                               :with_subprojects => false,
                                               :author => @author)
    @activity.scope_select {|t| !has["show_#{t}"].nil?}
    events = @activity.events(@date_from, @date_to)

   # @activity = Activity.where("update_on between " +@date_from.to_s + " and " +@date_to.to_s  ).order('id desc')
    #@activity_count =  @activity.count
    #@activity_pages = Paginator.new @activity_count, pre_count, params['page']
   # @activity = activity.offset(@activity_pages.offset).limit(@activity_pages.per_page).all

    @offset, @limit = api_offset_and_limit({:limit => 10})
    @events_count = events.count
    @events_pages = Paginator.new @events_count, @limit, params['page']
    @offset ||= @events_pages.offset
    events = events.slice(@offset,@limit)

    @events_by_day = events.group_by {|event| User.current.time_to_date(event.event_datetime)}
    #  documents
    @sort_by = %w(category date title author).include?(params[:sort_by]) ? params[:sort_by] : 'category'
    #
    @teachers= searchTeacherAndAssistant(@course)
    @canShowRealName = isCourseTeacher(User.current.id)

    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

    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)
    result = false
    if  @teachers && @teachers.find_by_user_id(id) != nil
      result = true
    end
    result
  end

  def feedback
    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

    @feedback_count = @jours.count
    @feedback_pages = Paginator.new @feedback_count, @limit, page
    @offset ||= @feedback_pages.offset
    @jour = @jours[@offset, @limit]
    @state = false
    @base_courses_tag = @course.course_type
    respond_to do |format|
      format.html{render :layout => 'base_courses' if @base_courses_tag==1}
      format.api
    end
  end



  private

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





end