class implementation_notification_channel_libnotify(interface_notification_channel):
	
	'''
	[implementation]
	'''
	def parameters_schema(self):
		return {
			"type": "object",
			"additionalProperties": False,
			"properties": {
				"icon": {
					"type": "string"
				}
			},
			"required": [
			]
		}
		
	
	'''
	[implementation]
	'''
	def normalize_conf_node(self, node):
		return dict_merge(
			{
				"icon": "/usr/local/share/icons/heimdall.png",
			},
			node
		)
		
	
	'''
	[implementation]
	'''
	def notify(self, parameters, name, data, state, info):
		def condition_translate(condition):
			if (condition == enum_condition.unknown):
				return "normal"
			elif (condition == enum_condition.ok):
				return "low"
			elif (condition == enum_condition.warning):
				return "normal"
			elif (condition == enum_condition.critical):
				return "critical"
			else:
				raise ValueError("impossible condition")
		parts = []
		parts.append(
			"notify-send"
		)
		## app name
		parts.append(
			string_coin(
				"--app-name={{app_name}}",
				{
					"app_name": "heimdall",
				}
			)
		)
		## urgency
		parts.append(
			string_coin(
				"--urgency={{urgency}}",
				{
					"urgency": condition_translate(state["condition"]),
				}
			)
		)
		## icon
		if ("icon" not in parameters):
			pass
		else:
			parts.append(
				string_coin(
					"--icon={{icon}}",
					{
						"icon": parameters["icon"],
					}
				)
			)
		## summary
		parts.append(
			string_coin(
				"{{condition}} | {{title}}",
				{
					"title": data["title"],
					"condition": condition_encode(state["condition"]).upper(),
				}
			)
		)
		## body
		parts.append(
			"(no info)"
			if (info == "") else
			info
		)
		_subprocess.run(parts)