class CoursesService
  include ApplicationHelper
  include CoursesHelper
  #参数school_id为0或不传时返回所有课程，否则返回对应学校的课程
  #参数per_page_count分页功能，每页显示的课程数
  #参数page分页功能，当前页码
  def course_list params
    @school_id = params[:school_id]
    per_page_option = params[:per_page_count] || 10
    page_no = params[:page] || 1
    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 = Redmine::Pagination::Paginator.new @course_count, per_page_option,page_no
    @courses = @courses_all.order("created_at desc")
    @courses = @courses.offset(@course_pages.offset).limit(@course_pages.per_page)
    course_list = []
    @courses.each do |course|
      course_list << {:course => course,:img_url => url_to_avatar(course)}
    end
    course_list
  end

  #搜索课程
  def search_course params
    courses_all = Course.all_course
    name = params[:name]
    if name.blank?
      raise 'sumbit empty'
    end
    @courses = courses_all.visible
    if params[:name].present?
      @courses_all = @courses.like(params[:name])
    else
      @courses_all =  @courses;
    end
    @courses_all
  end

  #获取头像
  def get_img obj
    url_to_avatar(obj)
  end

  #课程老师或课程学生列表
  def course_teacher_or_student_list params,course
    @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
  end

  #课程通知列表
  def course_news_list params
    if params[:course_id] && @course==nil
      @course = Course.find(params[:course_id])
    end
    scope = @course ? @course.news.course_visible : News.course_visible
  end

  def show_course params
    course = Course.find(params[:id])
    course
  end

  def create_course

  end

end