#!/usr/bin/env python3

import time
from prometheus_client import start_http_server, Gauge
import requests, json
from datetime import datetime, timedelta

# Configuration -------------------------------------------
listening_port = 9928
update_period = 60 * 5 # Each 5 min
# ---------------------------------------------------------

metric_temp = Gauge('upc_c6_s302_temp', 'UPC C6 S302 temperature sensor')

def genparams():
    d = {}
    d['topic'] = 'TEMPERATURE'
    d['shift_dates_to'] = ''
    d['datapoints'] = 301
    d['devicesAndColors'] = '1148418@@@#40ACB6'

    now = datetime.now()

    d['fromDate'] = now.strftime('%d/%m/%Y')
    d['toDate'] = now.strftime('%d/%m/%Y')
    d['serviceFrequency'] = 'NONE'

    # WTF!
    for i in range(7):
        for j in range(48):
            key = 'week.days[{}].hours[{}].value'.format(i, j)
            d[key] = 'OPEN'

    return d

def measure():
    # First we need to load session
    s = requests.Session()
    r = s.get("https://upc.edu/sirena")
    if r.status_code != 200:
        print("bad HTTP status code on new session: {}".format(r.status_code))
        return

    if s.cookies.get("JSESSIONID") is None:
        print("cannot get JSESSIONID")
        return

    # Now we can pull the data
    url = "https://upcsirena.app.dexma.com/l_12535/analysis/by_datapoints/data.json"
    r = s.post(url, data=genparams())

    if r.status_code != 200:
        print("bad HTTP status code on data: {}".format(r.status_code))
        return

    #print(r.text)
    j = json.loads(r.content)

    # Just take the last one
    last = j['data']['chartElementList'][-1]
    temp = last['values']['1148418-Temperatura']

    return temp

if __name__ == '__main__':
    start_http_server(port=listening_port, addr="localhost")
    while True:
        try:
            metric_temp.set(measure())
        except:
            print("measure failed")
            metric_temp.set(float("nan"))

        time.sleep(update_period)