#!/usr/bin/ruby
require 'discordrb'
require 'video_info'
require 'uri'
require 'optparse'
require 'shellwords'
require './mpc_shim'
require './util'


options = {}
OptionParser.new do |opt|
  opt.on("-t", "--token DISCORD_BOT_TOKEN") {|o| options[:bot_token] = o}
  opt.on("-c", "--channel CHANNEL_ID") {|o| options[:channel_id] = Integer(o)}
  opt.on("-h", "--host MPD_HOST") {|o| options[:host] = o}
end.parse!

if ENV.has_key? "DISCORD_BOT_TOKEN"
  options[:bot_token] = ENV["DISCORD_BOT_TOKEN"]
end

if ENV.has_key? "CHANNEL_ID"
  options[:channel_id] = Integer(ENV["CHANNEL_ID"])
end

if ENV.has_key? "MPD_HOST"
  options[:host] = ENV["MPD_HOST"]
end

if options.length == 0
  puts "Need to specifiy token and channel"
  exit
end
mpc = MpcShim.new(options[:host])

puts "creating spool and tracks directories"
`mkdir -p spool`
`mkdir -p tracks`

if File.exists?("/usr/bin/mpd")
  if !File.exists?("/usr/bin/mpc")
    puts "Bailing since mpd exists but not mpc (which is needed to control mpd)"
    exit
  end
  if mpc.running?
    puts "starting mpd if not already running"
    `systemctl start mpd` unless `ps aux | grep mpd` != ""
    mpc.reset
  end
end

bot = Discordrb::Commands::CommandBot.new token: options[:bot_token], prefix: '!radio '

bot.command :start do |event|
  if mpc.running?
    mpc.play
  else
    mpc.start
    mpc.reset
    mpc.play
  end
  event.respond("starting radio")
end

bot.command :stop do |event|
  mpc.stop
  event.respond("stoping radio")
end

bot.command :reload do |event|
  event.respond("reloading queue")
  mpc.stop
  mpc.clear
  mpc.update
  mpc.add
  event.respond("queue reloaded")
  nil
end

bot.command :pause do |event|
  event.respond("pausing playback")
  mpc.toggle
  nil
end

bot.command :skip do |event|
  event.respond("skipping")
  mpc.next()
  nil
end

bot.command :shuffle do |event|
  mpc.shuffle()
  event.respond("shuffled queue")
  nil
end

bot.command :nowplaying do |event|
  event.respond(mpc.nowplaying)
end

bot.command :initialize do |event|
  event.respond("loading last 50 messages from channel")
  channel  = bot.channel(options[:channel_id])
  messages = channel.history(50)
  messages.each do |msg|
    parse_songs_from_string(msg.content)
  end
  update_mpd(mpc)
  event.respond("done loading")
end


bot.message(in: options[:channel_id],contains: "youtube.com") do |event|
  parse_songs_from_string(event.content)
  update_mpd(mpc)
end

puts("logging into discord")
bot.run(true)
puts("starting main loop")
timer = 30
bot.online
bot.listening = ""
loop do
  sleep timer
  if !mpc.playing?
    bot.online
    current = mpc.nowplaying
    status = bot.listening=current
    if status != current
      puts("tried to update listening status but got #{status} back")
    elsif status == ""
      puts("tried to update listening status but have empty now playing")
    end
  else
    bot.listening = ""
    bot.idle
  end
end