from http.server import BaseHTTPRequestHandler
from datetime import datetime
import socketserver
import requests
import hashlib


PORT = 8808
TOKEN = 'kUp26@Zg4fv$9Pm'
ZONE = 'FR'
ENDPOINT = f'/v7/details/hourly/{ZONE}'
URL = f'https://app-backend.electricitymap.org{ENDPOINT}'


def create_headers():
    timestamp = str(int(datetime.now().timestamp() * 1000))
    concat = f'{TOKEN}{ENDPOINT}{timestamp}'
    signature = hashlib.sha256()
    signature.update(concat.encode('utf-8'))
    signature = signature.hexdigest()

    headers = {
        "electricitymap-token": TOKEN,
        "x-request-timestamp": timestamp,
        "x-signature": signature,
        "User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/118.0"
    }
    return headers

def fetch_intensity():
    headers = create_headers()
    electricityMap = requests.get(URL, headers=headers)
    jsonElectricityMap = electricityMap.json()
    last_key = list(jsonElectricityMap["data"]["zoneStates"])[-1]

    return jsonElectricityMap["data"]["zoneStates"][last_key]['co2intensity']

class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):

    def do_GET(self):
        data = fetch_intensity()
        
        self.send_response(200)
        self.end_headers()
        response_string = f'electricitymap_carbon_intensity{{zone="{ZONE}"}} ' + str(data)
        self.wfile.write(response_string.encode('utf-8'))

with socketserver.TCPServer(("", PORT), SimpleHTTPRequestHandler) as httpd:
    print("serving at port", PORT)
    httpd.serve_forever()