#!/usr/bin/env python
import logging
import asyncio
from asyncio_simple_http_server import HttpServer, uri_mapping, HttpHeaders, HttpResponse
from datetime import datetime, timezone
from bleak import BleakScanner
from functools import partial
from atc_mi_interface import general_format, atc_mi_advertising_format

fields=['temperature','humidity','battery_level','battery_v']

def write_out_prometheus(collected):
    f = open("metrics", "w", encoding="utf-8")
    for field in fields:
        print("# HELP therm_{0} {0}\n# TYPE therm_{0} gauge".format(field),file=f)
        for mac in collected:
            print("therm_{0}{{mac=\"{1}\"}} {2:f}".format(field,mac,collected[mac][field][0]),file=f)

class Prom:
    collected = {}

    @uri_mapping('/metrics')
    def expose(self) -> HttpResponse:
        output=""
        for field in fields:
            output = output + "# HELP therm_{0} {0}\n# TYPE therm_{0} gauge\n".format(field)
            for mac in self.collected:
                try:
                    output = output + "therm_{0}{{mac=\"{1}\"}} {2:f}\n".format(
                        field, mac, self.collected[mac][field][0]
                        )
                except E:
                    output = output + "# therm_{0}{{mac=\"{1}\"}} {2}\n".format(
                        field, mac, E
                        )

        headers = HttpHeaders()
        headers.set('Content-type', 'text/plain; version=0.0.4; charset=utf-8; escaping=values')
        return HttpResponse(200, headers, output.encode('utf-8'))

async def main():
    stop_event = asyncio.Event()
    http_server = HttpServer()

    handler=Prom()
    http_server.add_handler(handler)

    async def detection_callback(device, advertisement_data):
        format_label, adv_data = atc_mi_advertising_format(advertisement_data)
        if not adv_data:
            return
        mac_address = bytes.fromhex(device.address.replace(":", ""))
        atc_mi_data = general_format.parse(
            adv_data,
            mac_address=mac_address,
            bindkey=None,
        )

        data={
            "timestamp": datetime.now(timezone.utc).isoformat(),
            "temperature": atc_mi_data.search_all("^temperature"),
            "humidity": atc_mi_data.search_all("^humidity"),
            "battery_level": atc_mi_data.search_all("^battery_level"),
            "battery_v": atc_mi_data.search_all("^battery_v"),
            "MAC": atc_mi_data.search_all("^MAC$"),
        }
        handler.collected[data["MAC"][0]]=data

    await http_server.start('10.111.0.66',9003)

    async with BleakScanner(
        detection_callback=partial(detection_callback)
    ) as scanner:
        await http_server.serve_forever()
    print("Stopped")

logging.basicConfig(level=logging.INFO,
                    format='%(asctime)-15s %(name)-5s %(levelname)-8s %(message)s')
server_logger = logging.getLogger('asyncio_simple_http_server')
def filterNoise(event):
    if event.msg == 'got a failure %s. disconnecting the client' and event.args[0] == asyncio.TimeoutError:
        return False
    return True
server_logger.addFilter(filterNoise)


asyncio.run(main())