#!/usr/bin/ruby

require File.expand_path('../../lib/recordandplayback', __FILE__)
require 'nokogiri'
require 'optimist'

props = YAML::load(File.open(File.expand_path('../bigbluebutton.yml', __FILE__)))
log_dir = props['log_dir']
raw_recording_dir = "#{props['recording_dir']}/raw"
published_dir = props['published_dir']
unpublished_dir = "#{published_dir}/../unpublished"

opts = Optimist::options do
  opt(:force, "Run script even if it has previously been run",
              :default => false)
  opt(:quiet, "Minimal output mode, for automated use",
              :default => false)
end

log_file = "#{log_dir}/bbb-0.9-beta-recording-update.log"
done_file = "#{props['recording_dir']}/status/bbb-0.9-beta-recording-update-v2.done"

logger = Logger.new(log_file)
logger.level = Logger::INFO
BigBlueButton.logger = logger

if File.exist?(done_file) and !opts.force
  if !opts.quiet
    puts "Script has previously been run, doing nothing"
    puts "Use the --force option to override"
  end
  exit 0
end

def do_recording_update(recording_dir, raw_recording_dir)
  match = /([^\/]*)$/.match(recording_dir)
  meeting_id = match[1]

  BigBlueButton.logger.info("Processing recording #{meeting_id}")

  # Read the metadata.xml file to check if the URL needs update
  metadata_xml = nil
  File.open("#{recording_dir}/metadata.xml") do |io|
    metadata_xml = Nokogiri::XML(io)
  end

  link_xml = metadata_xml.at_xpath('/recording/playback/link')
  link = link_xml.content
  # Check whether the recording already has a versioned playback link
  m = /presentation\/([0-9.]+)\/playback\.html/.match(link)
  if (m)
    BigBlueButton.logger.info("Recording using playback scripts version #{m[1]}, ok")
    return
  end

  # Determine which version playback is appropriate for the recording
  events_xml = nil
  File.open("#{raw_recording_dir}/#{meeting_id}/events.xml") do |io|
    events_xml = Nokogiri::XML(io)
  end

  recording_xml = events_xml.at_xpath('/recording')
  bbb_version = recording_xml['bbb_version']
  if (!bbb_version)
    bbb_version = '0.81'
  elsif bbb_version == '0.90' # Old beta versions
    bbb_version = '0.9.0'
  elsif bbb_version == '0.9.0' # Current version
  else
    BigBlueButton.logger.error("Unsupported BigBlueButton version #{bbb_version}")
    return
  end

  BigBlueButton.logger.info("Rewriting link with version #{bbb_version}")
  link.sub!(/presentation\/playback\.html/, "presentation/#{bbb_version}/playback.html")
  link_xml.content = link

  # Rewrite the metadata.xml file
  IO.write("#{recording_dir}/metadata.xml", metadata_xml.to_xml)

rescue StandardError => e
  BigBlueButton.logger.error("Failed to update recording #{meeting_id}: #{e}")
  e.backtrace.each do |traceline|
    BigBlueButton.logger.error(traceline)
  end
end

BigBlueButton.logger.info("Updating playback path of 0.9 beta recordings")

puts "Updating recording links for 0.9.0..."

num_recordings = 0

BigBlueButton.logger.info("Checking recordings in #{published_dir}")
Dir.glob("#{published_dir}/presentation/*-*").each do |recording_dir|
  print '.' if num_recordings % 10 == 0
  num_recordings += 1
  do_recording_update(recording_dir, raw_recording_dir)
end

BigBlueButton.logger.info("Checking recordings in #{unpublished_dir}")
Dir.glob("#{unpublished_dir}/presentation/*-*").each do |recording_dir|
  print '.' if num_recordings % 10 == 0
  num_recordings += 1
  do_recording_update(recording_dir, raw_recording_dir)
end

puts "done"

puts "See the output in #{log_file} for details"

BigBlueButton.logger.info("Processed #{num_recordings} recordings")

IO.write(done_file, Time.now)