import os
import sys
import json
import django
from typing import Dict
from pathlib import Path
from enum import Enum
from datetime import datetime, timedelta
import paho.mqtt.client as mqtt


pwd = os.path.dirname(os.path.realpath(__file__))
project_path = Path(pwd).parent.parent
if project_path not in sys.path:
    sys.path.append(str(project_path))

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "mosqkiller.settings")
django.setup()

from mosquito.models import MosqPost, DeviceInfo, DevicePostStatistic, Org

# MQTT 配置
MQTT_BROKER = "8.217.112.255"
MQTT_PORT = 1883
DATA_TOPIC = 'solarmosquitolamp/devices/+/data'
STATE_TOPIC = 'solarmosquitolamp/devices/+/state'


class PowerType(Enum):
    Load = 'Load'
    StorageBattery = 'StorageBattery'
    SolarPanels = 'SolarPanels'
    ACPower = 'AC Power'
    DCPower = 'DC Power'


# 当我们从MQTT服务器接收到消息时调用此函数
def on_message(client, userdata, message):
    # 提取消息的主题
    topic = message.topic
    print(f"Message received on topic: {topic}")

    # 从主题中解析 device_id
    topic_parts = topic.split('/')
    device_id = topic_parts[2]

    payload = message.payload.decode('utf-8')

    # update and create
    post_data = json.loads(payload)
    try:
        update_device_info(device_id, post_data=post_data)
        create_mosq_post(device_id, post_data=post_data)
        update_mosq_device_statistic(device_id, post_data=post_data)
        print(f"Device: {device_id} update & create post success")
    except KeyError as e:
        print(f"Device: {device_id} update & create post failed")
        print(f"key: {e} is not existed")


def update_device_info(device_id: str, post_data: Dict):
    device = DeviceInfo.objects.filter(device_id=device_id).first()
    latitude, longitude = post_data['positioning'].split(',')
    latitude = float(latitude.replace('N ', ''))
    longitude = float(longitude.replace('E ', ''))

    count = post_data['count']
    signal = post_data['signal']
    led_status = post_data['RemoteLEDlightingFixtures']['LED']
    energy = post_data['quantityofelectricity']
    load = to_string(post_data, power_type=PowerType.Load)
    storage_battery = to_string(post_data, power_type=PowerType.StorageBattery)
    solar_panels = to_string(post_data, power_type=PowerType.SolarPanels)
    ac_power = to_string(post_data, power_type=PowerType.ACPower)
    dc_power = to_string(post_data, power_type=PowerType.DCPower)
    if device is None:
        DeviceInfo.objects.create(device_id=device_id,
                                  longitude=longitude,
                                  latitude=latitude,
                                  count=count,
                                  signal=signal,
                                  led_status=led_status,
                                  energy=energy,
                                  load=load,
                                  storage_battery=storage_battery,
                                  solar_panels=solar_panels,
                                  ac_power=ac_power,
                                  dc_power=dc_power,
                                  org_id=1,)
    else:
        device.load = load
        device.storage_battery = storage_battery
        device.solar_panels = solar_panels
        device.ac_power = ac_power
        device.dc_power = dc_power
        device.count = count
        device.signal = signal
        device.led_status = led_status
        device.energy = energy
        device.save()


def create_mosq_post(device_id: str, post_data: Dict):
    load = to_string(post_data, power_type=PowerType.Load)
    storage_battery = to_string(post_data, power_type=PowerType.StorageBattery)
    solar_panels = to_string(post_data, power_type=PowerType.SolarPanels)
    ac_power = to_string(post_data, power_type=PowerType.ACPower)
    dc_power = to_string(post_data, power_type=PowerType.DCPower)
    count = post_data['count']
    led_status = post_data['RemoteLEDlightingFixtures']['LED']
    signal = post_data['signal']
    energy = post_data['quantityofelectricity']
    MosqPost.objects.create(device_id=device_id,
                            count=count,
                            led_status=led_status,
                            load=load,
                            signal=signal,
                            energy=energy,
                            storage_battery=storage_battery,
                            solar_panels=solar_panels,
                            ac_power=ac_power,
                            dc_power=dc_power)


def update_mosq_device_statistic(device_id: str, post_data: Dict):
    device = DeviceInfo.objects.filter(device_id=device_id).first()
    datetime_format = "%Y-%m-%d %H:%M:%S"
    cur_date = datetime.strptime(post_data['time'], datetime_format).date()
    cur_record = DevicePostStatistic.objects.filter(device_id=device_id, date=cur_date).first()
    last_record = DevicePostStatistic.objects.filter(device_id=device_id, date=cur_date - timedelta(days=1)).first()
    if last_record and cur_record:
        incr = cur_record.total - last_record.total
    else:
        incr = 0

    mqtt_total = post_data['count']
    if cur_record:
        cur_record.total = mqtt_total
        cur_record.increment = incr
        cur_record.save()
    else:
        DevicePostStatistic.objects.create(device_id=device_id,
                                           date=cur_date,
                                           total=mqtt_total,
                                           increment=incr,
                                           org=device.org)


def to_string(post_data: Dict, power_type: PowerType) -> str:
    _type = power_type.value
    load_v = post_data[_type]['voltage']
    load_c = post_data[_type]['current']
    load_p = post_data[_type]['power']
    return ",".join([str(load_v), str(load_c), str(load_p)])


# 初始化MQTT客户端
client = mqtt.Client()
client.on_message = on_message

client.connect(MQTT_BROKER, MQTT_PORT, 60)

# 订阅所有设备的主题
client.subscribe(DATA_TOPIC)
# client.subscribe(STATE_TOPIC)

# 开始MQTT客户端
client.loop_forever()