#!/usr/bin/env python3
"""
Data models for different device types managed by the Juice IOT hub.
"""
import re
import json

import tools

import requests

class Network(list):
	"""
	Represents a network of IOT devices.
	"""
	def find(self, device_id):
		"""
		Searches through the network and returns the matching device,
		or None.
		"""
		for device in self:
			if device.id == device_id:
				break
		else:
			return None
		return device


class Device:
	"""
	Represents a generic device on the Network.
	"""
	def __init__(self):
		self.id = ""
		self.type = ""
		self.description = ""
		self.location = ""
		self.ip_address = ""
		self.mqtt_root = ""
		self.locked = False
		self.sub_devices = []

	def find(self, sub_device_id):
		"""
		Searches through the devices sub_devices and returns the matching
		sub_device, or None.
		"""
		for sub_device in self.sub_devices:
			if sub_device.id == sub_device_id:
				break
		else:
			return None
		return sub_device

	def from_dict(self, data):
		"""
		Initializes self with data from dict.
		"""
		for key, value in data.items():
			if key == 'sub_devices':
				continue
			else:
				setattr(self, key, value)
		for sub_device_dict in data.get('sub_devices'):
			if sub_device_dict.get('type') == 'RelayOutlet':
				sub_device = RelayOutlet().from_dict(sub_device_dict)
				self.sub_devices.append(sub_device)
			elif sub_device_dict.get('type') == 'NeoPixel':
				sub_device = NeoPixel().from_dict(sub_device_dict)
				self.sub_devices.append(sub_device)
			else:
				typ = sub_device_dict.get('type')
				raise ValueError(f"Unknown sub_device type {typ}")
		return self

	async def mqtt_callback(self, msg):
		"""
		Called when the MQTT client receives a message directed to this
		device. Should be overridden by the device implementation.
		"""
		pass


class SubDevice:
	"""
	Represents a generic subdevice in a Device.
	"""
	def from_dict(self, data):
		"""
		Initializes self with data from dict.
		"""
		for key, value in data.items():
			setattr(self, key, value)
		return self


class RelayDevice(Device):
	"""
	Represents a relay receptacle device controlled by an ESP-01. The
	ESP-01 acts a simple switch to turn each receptable on or off via
	a relay. Each device only has two outputs, `OUT0` and `OUT2`.
	"""
	def __init__(self):
		super().__init__()
		self.type = "RelayDevice"

	def update(self):
		"""
		Queries the physical device and updates the internal model as
		appropriate.
		"""
		if not self.ip_address:
			return
		for sub_dev in self.sub_devices:
			res = requests.get(self.ip_address)
			gpio0 = re.search(r"GPIO0: (\bLow|\bHigh)", res.text).groups()[0]
			sub_dev.state = gpio0 == 'High'

	def toggle(self, sub_device_id):
		"""
		Toggles the state of a sub device.
		"""
		sub_device = self.find(sub_device_id)
		if not sub_device:
			return None

		params = {sub_device.gpio: 'toggle'}
		res = requests.get('http://' + self.ip_address + '/gpio',params=params)
		res.raise_for_status()

		state = re.search(
			rf"GPIO{sub_device.gpio}: (\bLow|\bHigh)",
			res.text
		).groups()[0] == 'High'
		sub_device.state = state

		return state


class RelayOutlet(SubDevice):
	"""
	Represents a single outlet on a RelayDevice.
	"""
	def __init__(self):
		self.id = ""
		self.type = "RelayOutlet"
		self.description = ""
		self.gpio = ""
		self.state = False


class LightStrip(Device):
	"""
	Represents an RGB LED light strip controller.
	"""
	def __init__(self):
		super().__init__()
		self.type = "LightStrip"

	async def mqtt_callback(self, app, msg):
		topic = msg.topic.split('/')
		payload = msg.payload.decode('utf8').split(',')
		payload = [int(num) for num in payload]

		sub_device = self.find('led' + topic[4])
		sub_device.color = payload
		save_network(network)

		data = {}
		data['ok'] = True
		data['device_id'] = self.id
		data['change_mode'] = topic[1]
		data['type'] = topic[2]
		if topic[2] == 'solid':
			data['amount'] = topic[3]
			if topic[3] == 'single':
				data['sub_device_id'] = 'led' + topic[4]
			data['color'] = tools.to_html_color(payload)
		res = {'event': 'neopixel', 'data': data}
		await app.send_json_all(res)


class NeoPixel(SubDevice):
	"""
	Represents a single NeoPixel in a LightStrip.
	"""
	def __init__(self):
		self.id = ""
		self.type = "NeoPixel"
		self.color = [0,0,0] # JSON doesn't have tuples


class DeviceEncoder(json.JSONEncoder):
	"""
	A custom json encoder for dumping devices to file.
	"""
	def default(self, o):
		return vars(o)


def init_network(filepath="devices.json"):
	"""
	Initializes the network of IOT devices.
	"""
	with open(filepath, 'r') as file:
		data = file.read()
	data = json.loads(data)
	network = Network()
	for device_dict in data:
		if device_dict.get('type') == 'RelayDevice':
			device = RelayDevice().from_dict(device_dict)
			network.append(device)
		elif device_dict.get('type') == 'LightStrip':
			device = LightStrip().from_dict(device_dict)
			network.append(device)
		else:
			raise ValueError(f"Unknown device type {device_dict.get('type')}")
	return network


def save_network(network, filepath="devices.json"):
	"""
	Dumps the network to file.
	"""
	with open(filepath, 'w') as file:
		file.write(json.dumps(network, cls=DeviceEncoder, indent='\t'))


network = init_network()