# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.
#
# Copyright (c) 2016 BigBlueButton Inc. and by respective authors (see below).
#
# This program is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free Software
# Foundation; either version 3.0 of the License, or (at your option) any later
# version.
#
# BigBlueButton is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.

class LandingController < ApplicationController
  include BbbApi

  def index
    # If guest access is disabled, redirect the user to the guest landing and force login.
    redirect_to guest_path if Rails.configuration.disable_guest_access
  end

  def resource
    if Rails.configuration.disable_guest_access && params[:resource] == 'meetings'
      redirect_to guest_path
    else
      if params[:id].size > meeting_name_limit
        redirect_to root_url, flash: {danger: t('meeting_name_long')}
      elsif ['&', '$', ','].any? { |c| params[:id].include?(c) } # temporary fix for misbehaving characters
        redirect_to root_url, flash: {danger: t('disallowed_characters_msg')}
      elsif params[:resource] == 'meetings' && !params[:room_id]
        render_meeting
      elsif params[:resource] == 'rooms'
        render_room
      else
        redirect_to root_url, flash: {danger: t('error')}
      end
    end
  end

  def guest
    # If someone tries to access the guest landing when guest access is enabled, just send them to root.
    redirect_to root_url unless Rails.configuration.disable_guest_access
  end
  
  # Sends data on meetings that the current user has previously joined.
  def get_previous_meeting_statuses
    previously_joined = params[:previously_joined]
    active_meetings = bbb.get_meetings[:meetings]
    payload = {active: [], waiting: []}
    # Find meetings that are owned by the current user and also active.
    active_meetings.each do |m|
      if m[:metadata].has_key?(:'room-id')
        if previously_joined.include?(m[:meetingName])&& m[:metadata][:'room-id'] == current_user[:encrypted_id]
          if m[:attendees] == {}
            attendees = []
          else
            attendees = m[:attendees][:attendee]
            attendees = [attendees] unless attendees.is_a?(Array)
          end
          participants = []
          moderators = []
          attendees.each do |a|
            if a[:role] == 'MODERATOR'
              moderators << {name: a[:fullName], user_id: a[:userID]}
            else
              participants << {name: a[:fullName], user_id: a[:userID]}
            end
          end
          payload[:active] << {name: m[:meetingName], moderators: moderators, participants: participants}
        end
      end
    end  
    # Add the waiting meetings.
    payload[:waiting] = WaitingList.waiting[current_user[:encrypted_id]] || {}
    render json: payload
  end

  def wait_for_moderator
    WaitingList.add(params[:room_id], params[:name], params[:id])
    send_alert(params, 'waiting')
    render layout: false
  end

  def no_longer_waiting
    WaitingList.remove(params[:room_id], params[:name], params[:id])
    send_alert(params, 'no_longer_waiting')
  end

  def session_status_refresh
    @user = User.find_by(encrypted_id: params[:room_id])
    if @user.nil?
      render head(:not_found) && return
    end

    @meeting_id = params[:id]
    @meeting_running = bbb_get_meeting_info("#{@user.encrypted_id}-#{params[:id]}")[:returncode]

    render layout: false
  end

  def admin?
    @user && @user == current_user
  end
  helper_method :admin?

  def preferences
    @user = current_user
  end

  def landing_background
    if !current_user || !current_user.background? then
      (ENV['LANDING_BACKGROUND'].present?) ? ENV['LANDING_BACKGROUND'] : 'greenlight_background.png'
    else
      current_user.background.url
    end
  end
  helper_method :landing_background

  private

  def render_meeting
    @meeting_id = params[:id].strip
    params[:action] = 'meetings'
    render :action => 'meetings'
  end

  def render_room
    params[:action] = 'rooms'

    @user = User.find_by(encrypted_id: params[:room_id] || params[:id])
    if @user.nil?
      redirect_to root_path
      return
    end

    if @user.encrypted_id != params[:id]
      @meeting_id = params[:id].strip
    end
    @meeting_running = bbb_get_meeting_info("#{@user.encrypted_id}-#{@meeting_id}")[:returncode]
    @main_room = @meeting_id.blank? || @meeting_id == @user.encrypted_id

    render :action => 'rooms'
  end

  def send_alert(params, method)
    ActionCable.server.broadcast 'refresh_meetings',
      method: method,
      meeting: params[:id],
      room: params[:room_id],
      user: params[:name]
  end
end