class CoursesController < ApplicationController
  layout 'base_courses'
  include CoursesHelper
  helper :activities
  helper :members
  helper :words

  menu_item :overview
  menu_item :feedback, :only => :feedback
  menu_item :homework, :only => :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 :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?
      course = Course.find_by_id params[:object_id]
      if course
        @state = 4
      else
        unless (allow_join && User.current.member_of_course?(course))
          if params[:course_password] == course.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
        else
          @state = 3
        end
      end
    else
      @state = 5
    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
  rescue Exception => e
    @state = 4
    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 => nil, :object_id => nil} }
    end
  end

  def unjoin
    if User.current.logged?

      @member = Member.where('course_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 => 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
    @course.safe_attributes = params[:course]
    @course.time = params[:time]
    @course.term = params[:term]
    @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.find_by_course_id(@course.id)
        course_status.destroy if course_status
        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_url(@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 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]
    (redirect_to courses_url, :notice => l(:label_sumbit_empty);return) if name.blank?
    @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

    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
  end

  def member
    ## 有角色参数的才是课程，没有的就是项目
    @render_file = 'member_list'
    @teachers= searchTeacherAndAssistant(@course)
    @canShowCode = isCourseTeacher(User.current.id,@course) && params[:role] != '1'
    case params[:role]
      when '1'
        @subPage_title = l :label_teacher_list
        @members = searchTeacherAndAssistant(@course)
      when '2'
        @subPage_title = l :label_student_list
        @members = searchStudent(@course)
      else
        @subPage_title = ''
        @members = @course.member_principals.includes(:roles, :principal).all.sort
    end
    @members = paginateHelper @members
    render :layout => 'base_courses'
  end

  #判断指定用户是否为课程教师
  def isCourseTeacher(id)
    result = false
    if  @teachers.find_by_user_id(id) != nil
      result = true
    end
    result
  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
    else
      render_403
    end

  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]
    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_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
      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").
    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']

    #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").
          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 homework
    if @course.is_public != 0 || User.current.member_of_course?(@course)
      @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
        if limit == 0
          limit = 10
        end
        @bids = @bids.offset(@offset).limit(limit).all.reverse
      end
      render :layout => 'base_courses'
    else
      render_403
    end
   end

  # 新建作业
  def new_homework
    @homework = Bid.new
    @homework.proportion
    @homework.safe_attributes = params[:bid]
    if (User.current.logged? && User.current.member_of_course?(Course.find params[:id] ))
      render :layout => 'base_courses'
    else
      render_403
    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
     # 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_course_files" => true,
        "show_course_news" => true,
        "show_course_messages" => true,
        "show_bids" => true,
        "show_course_journals_for_messages" => true
    }
    @date_to ||= Date.today + 1
    #
    @date_from = (@date_to - @days) > @course.created_at.to_date ? (@date_to - @days) : @course.created_at.to_date
    #@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}"]}
    # modify by nwb
    # 添加私密性判断
    if User.current.member_of_course?(@course)|| User.current.admin?
      events = @activity.events(@date_from, @date_to)
    else
      events = @activity.events(@date_from, @date_to, :is_public => 1)
    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

    @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,@course)

    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,course)
    result = false
    user = User.find(id)
    if !user.nil? && user.allowed_to?(:as_teacher,course)
      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
    respond_to do |format|
      format.html{render :layout => 'base_courses'}
      format.api
    end
  end



  private

  def allow_join
    if course_endTime_timeout? Course.find(params[:object_id])
      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.show_course == 2
       render_404
    end
  end



end