class Course
	include Mongoid::Document
	include Mongoid::Timestamps
	include OrbitModel::Status
  	include MemberHelper
  	include Slug

	field :title, as: :slug_title, type: String, localize: true
	field :objective, localize: true
	field :year, type: Integer
    field :student_ids, type: Array, default: []
    field :course_code, type: String, default: ""
    field :rss2_id
	has_many :course_syllabus_files, :dependent => :destroy, :autosave => true
	has_many :course_progress_files, :dependent => :destroy, :autosave => true
	has_many :course_activity_files, :dependent => :destroy, :autosave => true
	has_many :course_multimedia_files, :dependent => :destroy, :autosave => true
	has_many :course_material_files, :dependent => :destroy, :autosave => true
	has_many :course_supplement_files, :dependent => :destroy, :autosave => true
	has_many :course_evaluation_files, :dependent => :destroy, :autosave => true
    has_many :course_assignments, :dependent => :destroy, :autosave => true

	belongs_to :course_semester
	belongs_to :course_category

	belongs_to :member_profile

	accepts_nested_attributes_for :course_syllabus_files, :allow_destroy => true
	accepts_nested_attributes_for :course_progress_files, :allow_destroy => true
	accepts_nested_attributes_for :course_activity_files, :allow_destroy => true
	accepts_nested_attributes_for :course_multimedia_files, :allow_destroy => true
	accepts_nested_attributes_for :course_material_files, :allow_destroy => true
	accepts_nested_attributes_for :course_supplement_files, :allow_destroy => true
	accepts_nested_attributes_for :course_evaluation_files, :allow_destroy => true

    index({year: -1, _id: -1}, { unique: false, background: false })
    scope :sort_year, ->{ order_by(:year => "desc", :id=>"desc") }
    scope :sort_for_frontend, ->{ where(:is_hidden=>false).order_by(:year=>'desc', :id=>"desc") }
    before_save do |record|
        selected_course = SelectedCourse rescue nil
        if selected_course
            student_ids_remove = record.student_ids_was.to_a - record.student_ids
            record.student_ids.each do |student_id|
                selected_course = SelectedCourse.where(:member_profile_id => student_id,:course_id=>record.id).first
                if selected_course.nil?
                    SelectedCourse.create(:member_profile => MemberProfile.find(student_id) , :course_id=>record.id , :year=>record.year,:course_title_translations=>record.title_translations)
                else
                    selected_course.update(:year=>record.year,:course_title_translations=>record.title_translations)
                end
            end
            student_ids_remove.each do |student_id|
                SelectedCourse.where(:member_profile_id => student_id,:course_id=>record.id).destroy
            end
        end
    end
    before_destroy do |record|
        selected_course = SelectedCourse rescue nil
        if selected_course
            SelectedCourse.where(:course_id=>record.id).destroy
        end
    end
    def students
        return MemberProfile.where(:id.in=>self.student_ids)
    end
    def display_students
        return MemberProfile.where(:id.in=>self.student_ids).map{|m| m.name}.join(", ")
    end
  	def self.get_plugin_datas_to_member(datas)

	    fields_to_show = [
	      "course_category",
          "course_code",
	      "title",
	      "year",
	    ]

	    fields_to_remove = []

    	pd_title = []

	    fields_to_show.each do |t|
	      if (self.fields[t].type.to_s == "String" || self.fields[t].type.to_s == "Object" rescue false)
	        fields_to_remove << t if (datas.where(t.to_sym.ne => nil, t.to_sym.ne => "").count == 0 rescue false)
	      else
	        fields_to_remove << t if (datas.where(t.to_sym.ne => nil).count == 0 rescue false)
	      end
	      pd_title <<  {
	          "plugin_data_title" => I18n.t("personal_course.#{t}")
	        } if !fields_to_remove.include?(t)
	    end

	    fields_to_show = fields_to_show - fields_to_remove

	    plugin_datas = datas.sort_for_frontend.collect.with_index do |p,idx|

	      pd_data = []
	      fields_to_show.collect do |t|
	        if t == "title"
            link = OrbitHelper.url_to_plugin_show(p.to_param,'personal_course')
            url_to_plugin_show_blank = OrbitHelper.instance_variable_get(:@url_to_plugin_show_blank)
            tmp_title = p.title
            pd_data << { "data_title" => (url_to_plugin_show_blank ? tmp_title : "<a title=\"#{tmp_title}\" href=\"#{link}\" target=\"_blank\">#{tmp_title}</a>") }
	        elsif t == "course_category"
	          pd_data << {"data_title" => (p.course_category.title rescue "")}
	        else
	          pd_data << { "data_title" => p.send(t) }
	        end
	      end

	      {
	        "pd_datas" => pd_data,
	        "type-sort" => (p.course_category.sort_position.to_i rescue 1000),
	        "sort-index" => idx
	      }

	    end
	    plugin_datas = plugin_datas.sort_by{|pd| [pd["type-sort"], pd["sort-index"]]}
	    return [pd_title,plugin_datas]
	    
	end

	def get_plugin_data(fields_to_show)
	    plugin_datas = []
	    fields_to_show.each do |field|
	      plugin_data = self.get_plugin_field_data(field) rescue nil
	      next if plugin_data.blank? or plugin_data['value'].blank?
	      plugin_datas << plugin_data
	    end
	    plugin_datas
	end

  def get_plugin_field_data(field)
    case field
    when "course_category"
      value = self.course_category.title rescue ""
    when "course_semester"
      value = self.course_semester.title rescue ""
    when "course_syllabus_file", "course_progress_file", "course_activity_file", "course_multimedia_file", "course_material_file", "course_supplement_file", "course_evaluation_file"
      files = []
      self.send(field.pluralize).each do |file| 
      	if !file.new_record? 
	        url = file.file.url
	        title = (file.title.blank? ? File.basename(file.file.path) : file.title)
	        files << "<li><a href='#{url}'' target='_blank'>#{title}</li>"
	    end
      end
      value = files.join("")
    when "authors"
      path = OrbitHelper.url_to_plugin_show(self.member_profile.to_param, 'member') rescue '#'
      value = "<a href='#{path}'>#{self.member_profile.name}</a>"
    when "students"
        value = self.display_students 
    else
      value = self.send(field) rescue ""
    end

    value = (value =~ /\A#{URI::regexp(['http', 'https'])}\z/) ? "<a href='#{value}' target='blank'>#{value}</a>" : value
    
    {
      "key"=>field,
      "title_class"=>"course-#{field.gsub('_','-')}-field",
      "value_class"=>"course-#{field.gsub('_','-')}-value",
      "title"=>I18n.t('personal_course.'+field),
      "value"=>value
    }
  end

end