#!/usr/bin/env python3
import gi, signal, logging, sys, os

# import GStreamer and GLib-Helper classes
gi.require_version('Gtk', '3.0')
gi.require_version('Gst', '1.0')
gi.require_version('GdkX11', '3.0')
gi.require_version('GstVideo', '1.0')
gi.require_version('GstNet', '1.0')
from gi.repository import Gtk, Gdk, Gst, GObject, GdkX11, GstVideo

# check min-version
minGst = (1, 5)
minPy = (3, 0)

Gst.init([])
if Gst.version() < minGst:
	raise Exception("GStreamer version", Gst.version(), 'is too old, at least', minGst, 'is required')

if sys.version_info < minPy:
	raise Exception("Python version", sys.version_info, 'is too old, at least', minPy, 'is required')


# init GObject & Co. before importing local classes
GObject.threads_init()
Gdk.init([])
Gtk.init([])

# import local classes
from lib.args import Args
from lib.config import Config
from lib.ui import Ui
from lib.loghandler import LogHandler

import lib.connection as Connection
import lib.clock as ClockManager

# main class
class Voctogui(object):
	def __init__(self):
		self.log = logging.getLogger('Voctogui')

		# Uf a UI-File was specified on the Command-Line, load it
		if Args.ui_file:
			self.log.info('loading ui-file from file specified on command-line: %s', self.options.ui_file)
			self.ui = Ui(Args.ui_file)

		else:
			# Paths to look for the gst-switch UI-File
			paths = [
				os.path.join(os.path.dirname(os.path.realpath(__file__)), 'ui/voctogui.ui'),
				'/usr/lib/voctogui/ui/voctogui.ui'
			]

			# Look for a gst-switch UI-File and load it
			for path in paths:
				self.log.debug('trying to load ui-file from file %s', path)

				if os.path.isfile(path):
					self.log.info('loading ui-file from file %s', path)
					self.ui = Ui(path)
					break

		if self.ui is None:
			raise Exception("Can't find any .ui-Files to use (searched %s)" % (', '.join(paths)))

		self.ui.setup()


	def run(self):
		self.log.info('setting UI visible')
		self.ui.show()

		try:
			self.log.info('running Gtk-MainLoop')
			Gtk.main()
			self.log.info('Gtk-MainLoop ended')
		except KeyboardInterrupt:
			self.log.info('Terminated via Ctrl-C')

	def quit(self):
		self.log.info('quitting Gtk-MainLoop')
		Gtk.main_quit()


# run mainclass
def main():
	# configure logging
	docolor = (Args.color == 'always') or (Args.color == 'auto' and sys.stderr.isatty())

	handler = LogHandler(docolor, Args.timestamp)
	logging.root.addHandler(handler)

	if Args.verbose >= 2:
		level = logging.DEBUG
	elif Args.verbose == 1:
		level = logging.INFO
	else:
		level = logging.WARNING

	logging.root.setLevel(level)

	# make killable by ctrl-c
	logging.debug('setting SIGINT handler')
	signal.signal(signal.SIGINT, signal.SIG_DFL)

	logging.info('Python Version: %s', sys.version_info)
	logging.info('GStreamer Version: %s', Gst.version())

	# establish a synchronus connection to server
	Connection.establish(
		Config.get('server', 'host'))

	# fetch config from server
	Config.fetchServerConfig()

	# Warn when connecting to a non-local core without preview-encoders enabled
	# the list-comparison is not complete (one could use a local hostname or the local system ip)
	# but it's only here to warn that one might be making a mistake
	use_previews = Config.getboolean('previews', 'enabled') and Config.getboolean('previews', 'use')
	looks_like_localhost = Config.get('server', 'host') in ['::1', '127.0.0.1', 'localhost']
	if not use_previews and not looks_like_localhost:
		logging.warn(
			'Connecting to `%s` (which looks like a remote host) might not work without enabeling '
			'the preview encoders (set `[previews] enabled=true` on the core) or it might saturate '
			'your ethernet link between the two machines.',
			Config.get('server', 'host')
		)

	# obtain network-clock
	ClockManager.obtainClock(Connection.ip)

	# switch connection to nonblocking, event-driven mode
	Connection.enterNonblockingMode()

	# init main-class and main-loop
	# (this binds all event-hander on the Connection)
	logging.debug('initializing Voctogui')
	voctogui = Voctogui()

	# start the Mainloop and show the Window
	logging.debug('running Voctogui')
	voctogui.run()

if __name__ == '__main__':
	main()
