"""
The gntp.notifier module is provided as a simple way to send notifications
using GNTP

.. note::
	This class is intended to mostly mirror the older Python bindings such
	that you should be able to replace instances of the old bindings with
	this class.
	`Original Python bindings <http://code.google.com/p/growl/source/browse/Bindings/python/Growl.py>`_

"""
import gntp
import socket
import logging
import platform

__all__ = [
	'mini',
	'GrowlNotifier',
]

logger = logging.getLogger(__name__)


def mini(description, applicationName = 'PythonMini', noteType = "Message",
			title = "Mini Message", applicationIcon = None, hostname = 'localhost',
			password = None, port = 23053, sticky = False, priority = None,
			callback = None):
	"""Single notification function

	Simple notification function in one line. Has only one required parameter
	and attempts to use reasonable defaults for everything else
	:param string description: Notification message

	.. warning::
			For now, only URL callbacks are supported. In the future, the
			callback argument will also support a function
	"""
	growl = GrowlNotifier(
		applicationName = applicationName,
		notifications = [noteType],
		defaultNotifications = [noteType],
		hostname = hostname,
		password = password,
		port = port,
	)
	result = growl.register()
	if result is not True:
		return result

	return growl.notify(
		noteType = noteType,
		title = title,
		description = description,
		icon = applicationIcon,
		sticky = sticky,
		priority = priority,
		callback = callback,
	)


class GrowlNotifier(object):
	"""Helper class to simplfy sending Growl messages

	:param string applicationName: Sending application name
	:param list notification: List of valid notifications
	:param list defaultNotifications: List of notifications that should be enabled
		by default
	:param string applicationIcon: Icon URL
	:param string hostname: Remote host
	:param integer port: Remote port
	"""

	passwordHash = 'MD5'
	socketTimeout = 3

	def __init__(self, applicationName = 'Python GNTP', notifications = [],
			defaultNotifications = None, applicationIcon = None, hostname = 'localhost',
			password = None, port = 23053):

		self.applicationName = applicationName
		self.notifications = list(notifications)
		if defaultNotifications:
			self.defaultNotifications = list(defaultNotifications)
		else:
			self.defaultNotifications = self.notifications
		self.applicationIcon = applicationIcon

		self.password = password
		self.hostname = hostname
		self.port = int(port)

	def _checkIcon(self, data):
		'''
		Check the icon to see if it's valid
		@param data:
		@todo Consider checking for a valid URL
		'''
		return data

	def register(self):
		"""Send GNTP Registration

		.. warning::
			Before sending notifications to Growl, you need to have
			sent a registration message at least once
		"""
		logger.info('Sending registration to %s:%s', self.hostname, self.port)
		register = gntp.GNTPRegister()
		register.add_header('Application-Name', self.applicationName)
		for notification in self.notifications:
			enabled = notification in self.defaultNotifications
			register.add_notification(notification, enabled)
		if self.applicationIcon:
			register.add_header('Application-Icon', self.applicationIcon)
		if self.password:
			register.set_password(self.password, self.passwordHash)
		self.add_origin_info(register)
		self.register_hook(register)
		return self._send('register', register)

	def notify(self, noteType, title, description, icon = None, sticky = False,
			priority = None, callback = None):
		"""Send a GNTP notifications

		.. warning::
			Must have registered with growl beforehand or messages will be ignored

		:param string noteType: One of the notification names registered earlier
		:param string title: Notification title (usually displayed on the notification)
		:param string description: The main content of the notification
		:param string icon: Icon URL path
		:param boolean sticky: Sticky notification
		:param integer priority: Message priority level from -2 to 2
		:param string callback:  URL callback

		.. warning::
			For now, only URL callbacks are supported. In the future, the
			callback argument will also support a function
		"""
		logger.info('Sending notification [%s] to %s:%s', noteType, self.hostname, self.port)
		assert noteType in self.notifications
		notice = gntp.GNTPNotice()
		notice.add_header('Application-Name', self.applicationName)
		notice.add_header('Notification-Name', noteType)
		notice.add_header('Notification-Title', title)
		if self.password:
			notice.set_password(self.password, self.passwordHash)
		if sticky:
			notice.add_header('Notification-Sticky', sticky)
		if priority:
			notice.add_header('Notification-Priority', priority)
		if icon:
			notice.add_header('Notification-Icon', self._checkIcon(icon))
		if description:
			notice.add_header('Notification-Text', description)
		if callback:
			notice.add_header('Notification-Callback-Target', callback)

		self.add_origin_info(notice)
		self.notify_hook(notice)

		return self._send('notify', notice)

	def subscribe(self, id, name, port):
		"""Send a Subscribe request to a remote machine"""
		sub = gntp.GNTPSubscribe()
		sub.add_header('Subscriber-ID', id)
		sub.add_header('Subscriber-Name', name)
		sub.add_header('Subscriber-Port', port)
		if self.password:
			sub.set_password(self.password, self.passwordHash)

		self.add_origin_info(sub)
		self.subscribe_hook(sub)

		return self._send('subscribe', sub)

	def add_origin_info(self, packet):
		"""Add optional Origin headers to message"""
		packet.add_header('Origin-Machine-Name', platform.node())
		packet.add_header('Origin-Software-Name', 'gntp.py')
		packet.add_header('Origin-Software-Version', gntp.__version__)
		packet.add_header('Origin-Platform-Name', platform.system())
		packet.add_header('Origin-Platform-Version', platform.platform())

	def register_hook(self, packet):
		pass

	def notify_hook(self, packet):
		pass

	def subscribe_hook(self, packet):
		pass

	def _send(self, type, packet):
		"""Send the GNTP Packet"""

		data = packet.encode()

		logger.debug('To : %s:%s <%s>\n%s', self.hostname, self.port, packet.__class__, data)

		s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
		s.settimeout(self.socketTimeout)
		s.connect((self.hostname, self.port))
		s.send(data.encode('utf8', 'replace'))
		recv_data = s.recv(1024)
		while not recv_data.endswith("\r\n\r\n"):
			recv_data += s.recv(1024)
		response = gntp.parse_gntp(recv_data)
		s.close()

		logger.debug('From : %s:%s <%s>\n%s', self.hostname, self.port, response.__class__, response)

		if response.info['messagetype'] == '-OK':
			return True
		logger.error('Invalid response: %s', response.error())
		return response.error()

if __name__ == '__main__':
	# If we're running this module directly we're likely running it as a test
	# so extra debugging is useful
	logging.basicConfig(level = logging.INFO)
	mini('Testing mini notification')
