from datetime import datetime, timedelta
from random import randint

import requests
import pytz
from django.conf import settings
from django.utils import timezone
from django.contrib.auth.models import User
from urllib.parse import urlencode

from medwings import models as mm

def fetch_initial_tokens(authorization_code, redirect_uri):
    data = {
        'action': 'requesttoken',
        'client_id': settings.WITHINGS_CONFIG['CLIENT_ID'],
        'client_secret': settings.WITHINGS_CONFIG['CLIENT_SECRET'],
        'grant_type': 'authorization_code',
        'code': authorization_code,
        'redirect_uri': redirect_uri
    }
    response = requests.post(
        url=settings.WITHINGS_CONFIG['ENDPOINT_URL_OAUTH2'],
        json=data
    )
    if response is not None:
        response.raise_for_status()

    return response.json()


def mock_fetch_initial_tokens(authorization_code, redirect_uri):
    response = {
        "status": 0,
        "body": {
            "userid": f"{randint(1, 5000)}",
            "access_token": "a075f8c14fb8df40b08ebc8508533dc332a6910a",
            "refresh_token": "f631236f02b991810feb774765b6ae8e6c6839ca",
            "expires_in": 10800,
            "scope": "user.info,user.metrics",
            "csrf_token": "PACnnxwHTaBQOzF7bQqwFUUotIuvtzSM",
            "token_type": "Bearer"
        }
    }
    return response


def save_tokens_to_session(request, response_data):
    request.session['withings_userid'] = response_data['body']['userid']
    request.session['withings_access_token'] = response_data['body']['access_token']
    request.session['withings_refresh_token'] = response_data['body']['refresh_token']

    now = timezone.now()
    request.session['withings_access_token_expiry'] = (now + timedelta(seconds=response_data['body']['expires_in'])).isoformat()
    request.session['withings_refresh_token_expiry'] = (now + timedelta(days=365)).isoformat()


def parse_getmeas_response(response_body: dict, user: User) -> list:
    body = response_body['body']
    records = []

    timezone = pytz.timezone(body['timezone'])

    for measure_group in body['measuregrps']:
        recorded = timezone.localize(datetime.fromtimestamp(measure_group['date']))

        blood_pressure_systolic_value = None
        blood_pressure_diastolic_value = None
        body_temperature_value = None
        heart_rate_value = None
        spo2_level_value = None
        for measure in measure_group['measures']:
            measure_type = measure['type']
            measure_value = measure['value']
            measure_unit = measure['unit']
            
            measure_value_adjusted = measure_value * (10 ** measure_unit)

            if measure_type == 9:
                blood_pressure_diastolic_value = measure_value_adjusted
            elif measure_type == 10:
                blood_pressure_systolic_value = measure_value_adjusted
            elif measure_type == 11:
                heart_rate_value = measure_value_adjusted
            elif measure_type == 54:
                spo2_level_value = measure_value_adjusted
            elif measure_type == 71:
                body_temperature_value = measure_value_adjusted

        if blood_pressure_systolic_value and blood_pressure_diastolic_value:
            records.append(mm.BloodPressureRecord(
                user=user,
                recorded=recorded,
                value_systolic_mmhg=blood_pressure_systolic_value,
                value_diastolic_mmhg=blood_pressure_diastolic_value
            ))
        if body_temperature_value:
            records.append(mm.BodyTempRecord(
                user=user,
                recorded=recorded,
                value_celsius=body_temperature_value
            ))
        if heart_rate_value:
            records.append(mm.HeartRateRecord(
                user=user,
                recorded=recorded,
                value_bpm=heart_rate_value
            ))
        if spo2_level_value:
            records.append(mm.Spo2LevelRecord(
                user=user,
                recorded=recorded,
                value_percent=spo2_level_value
            ))

    return records