# Set encoding to utf-8
# encoding: UTF-8

#
# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/
#
# Copyright (c) 2012 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/>.
#

require_relative 'boot'

require 'recordandplayback/events_archiver'
require 'recordandplayback/generators/events'
require 'recordandplayback/generators/audio'
require 'recordandplayback/generators/video'
require 'recordandplayback/generators/audio_processor'
require 'recordandplayback/generators/presentation'
require 'open4'
require 'pp'
require 'absolute_time'
require 'logger'
require 'find'
require 'rubygems'
require 'net/http'
require 'journald/logger'
require 'shellwords'
require 'English'

module BigBlueButton
  class MissingDirectoryException < RuntimeError
  end

  class FileNotFoundException < RuntimeError
  end

  class ExecutionStatus
    def initialize
      @output = []
      @errors = []
      @detailedStatus = nil
    end

    attr_accessor :output
    attr_accessor :errors
    attr_accessor :detailedStatus

    def success?
      @detailedStatus.success?
    end

    def exited?
      @detailedStatus.exited?
    end

    def exitstatus
      @detailedStatus.exitstatus
    end
  end

  # BigBlueButton logs information about its progress.
  # Replace with your own logger if you desire.
  #
  # @param [Logger] log your own logger
  # @return [Logger] the logger you set
  def self.logger=(log)
    @logger = log
  end

  # Get BigBlueButton logger.
  #
  # @return [Logger]
  def self.logger
    return @logger if @logger

    logger = Journald::Logger.new('bbb-rap')
    logger.level = Logger::INFO
    @logger = logger
  end

  def self.redis_publisher=(publisher)
    @redis_publisher = publisher
  end

  def self.redis_publisher
    return @redis_publisher
  end

  def self.execute(command, fail_on_error = true)
    BigBlueButton.logger.info("Executing: #{command.respond_to?(:to_ary) ? Shellwords.join(command) : command}")
    IO.popen(command, err: %i[child out]) do |io|
      io.each_line do |line|
        BigBlueButton.logger.info(line.chomp)
      end
    end
    status = $CHILD_STATUS

    BigBlueButton.logger.info("Success?: #{status.success?}")
    BigBlueButton.logger.info("Process exited? #{status.exited?}")
    BigBlueButton.logger.info("Exit status: #{status.exitstatus}")
    raise 'Execution failed' if status.success? == false && fail_on_error

    status
  end

  def self.exec_ret(*command)
    execute(command, false).exitstatus
  end

  def self.exec_redirect_ret(outio, *command)
    BigBlueButton.logger.info "Executing: #{Shellwords.join(command)}"
    BigBlueButton.logger.info "Sending output to #{outio}"
    IO.pipe do |r, w|
      pid = spawn(*command, :out => outio, :err => w)
      w.close
      r.each_line do |line|
        BigBlueButton.logger.info line.chomp
      end
      Process.waitpid(pid)
      BigBlueButton.logger.info "Exit status: #{$?.exitstatus}"
      return $?.exitstatus
    end
  end

  def self.hash_to_str(hash)
    return PP.pp(hash, "")
  end

  def self.monotonic_clock()
    return (AbsoluteTime.now * 1000).to_i
  end

  def self.download(url, output)
    BigBlueButton.logger.info "Downloading #{url} to #{output}"

    uri = URI.parse(url)
    if ["http", "https", "ftp"].include? uri.scheme
      response = Net::HTTP.start(uri.host, uri.port) {|http|
        http.head(uri.request_uri)
      }
      unless response.is_a? Net::HTTPSuccess
        raise "File not available: #{response.message}"
      end
    end

    if uri.scheme.nil?
      url = "file://" + url
      uri = URI.parse(url)
    end

    Net::HTTP.start(uri.host, uri.port) do |http|
      request = Net::HTTP::Get.new uri.request_uri
      http.request request do |response|
        open output, 'w' do |io|
          response.read_body do |chunk|
            io.write chunk
          end
        end
      end
    end
  end

  def self.try_download(url, output)
    begin
      self.download(url, output)
    rescue Exception => e
      BigBlueButton.logger.error "Failed to download file: #{e.to_s}"
      FileUtils.rm_f output
    end
  end

  def self.get_dir_size(dir_name)
    size = 0
    if FileTest.directory?(dir_name)
      Find.find(dir_name) {|f| size += File.size(f)}
    end
    size.to_s
  end

  def self.add_tag_to_xml(xml_filename, parent_xpath, tag, content)
    if File.exist? xml_filename
      doc = Nokogiri::XML(File.read(xml_filename)) {|x| x.noblanks}

      node = doc.at_xpath("#{parent_xpath}/#{tag}")
      node.remove if not node.nil?

      node = Nokogiri::XML::Node.new tag, doc
      node.content = content

      doc.at(parent_xpath) << node

      xml_file = File.new(xml_filename, "w")
      xml_file.write(doc.to_xml(:indent => 2))
      xml_file.close
    end
  end

  def self.add_raw_size_to_metadata(dir_name, raw_dir_name)
    size = BigBlueButton.get_dir_size(raw_dir_name)
    BigBlueButton.add_tag_to_xml("#{dir_name}/metadata.xml", "//recording", "raw_size", size)
  end

  def self.add_playback_size_to_metadata(dir_name)
    size = BigBlueButton.get_dir_size(dir_name)
    BigBlueButton.add_tag_to_xml("#{dir_name}/metadata.xml", "//recording/playback", "size", size)
  end

  def self.add_download_size_to_metadata(dir_name)
    size = BigBlueButton.get_dir_size(dir_name)
    BigBlueButton.add_tag_to_xml("#{dir_name}/metadata.xml", "//recording/download", "size", size)
  end

  def self.record_id_to_timestamp(r)
    r.split("-")[1].to_i / 1000
  end

  def self.done_to_timestamp(r)
    BigBlueButton.record_id_to_timestamp(File.basename(r, ".done"))
  end

  def self.rap_core_path
    File.expand_path('../../', __FILE__)
  end

  def self.rap_scripts_path
    File.join(BigBlueButton.rap_core_path, 'scripts')
  end

  def self.read_props
    return @props if @props

    filepathRecOverride = "/etc/bigbluebutton/recording/recording.yml"
    hasOverride = File.file?(filepathRecOverride)
    
    filepath = File.join(BigBlueButton.rap_scripts_path, 'bigbluebutton.yml')
    @props = YAML::load(File.open(filepath))
    if (hasOverride)
      recOverrideProps = YAML::load(File.open(filepathRecOverride))
      @props = @props.merge(recOverrideProps)
    end
    @props
  end

  def self.create_redis_publisher
    props = BigBlueButton.read_props
    redis_host = props['redis_host']
    redis_port = props['redis_port']
    redis_password = props['redis_password']
    BigBlueButton.redis_publisher = BigBlueButton::RedisWrapper.new(redis_host, redis_port, redis_password)
  end
end