"""Webapp utils."""

from django.utils import timezone
# from django.core.mail import send_mail
import os
from mailjet_rest import Client

from datetime import timedelta
import logging
from django.conf import settings
from django.template.loader import render_to_string
from django.core.files.base import ContentFile
import base64
import uuid
from sikweb.settings import FRONTEND_URL, URL, EMAIL_API_KEY, EMAIL_API_SECRET, DEFAULT_EMAIL_FROM, DEFAULT_EMAIL_FROM_ADDR, ENABLE_AUTOMATIC_EMAILS
import imghdr


def get_file_extension(file_name, decoded_file):
    extension = imghdr.what(file_name, decoded_file)
    extension = "jpg" if extension == "jpeg" else extension
    return extension


def decode_base64_file(data):
    # Check if this is a base64 string
    if isinstance(data, str):
        # Check if the base64 string is in the "data:" format
        if 'data:' in data and ';base64,' in data:
            # Break out the header from the base64 content
            header, data = data.split(';base64,')

        # Try to decode the file. Return validation error if it fails.
        try:
            decoded_file = base64.b64decode(data)
        except TypeError:
            TypeError('invalid_image')

        # Generate file name:
        file_name = str(uuid.uuid4())

        # Get the file name extension:
        file_extension = get_file_extension(file_name, decoded_file)

        complete_file_name = "%s.%s" % (file_name, file_extension, )

        return ContentFile(decoded_file, name=complete_file_name)


def month_from_now():
    """Return date one month from now."""
    return timezone.now() + timedelta(days=30)


def send_email(to, subject, body, html=False):
    if not ENABLE_AUTOMATIC_EMAILS:
        return
    try:
        mailjet = Client(auth=(EMAIL_API_KEY, EMAIL_API_SECRET), version='v3.1')

        data = {
            'Messages': [
                {
                    "From": {
                        "Email": DEFAULT_EMAIL_FROM_ADDR,
                        "Name": DEFAULT_EMAIL_FROM
                    },
                    "To": [
                        {
                            "Email": to,
                            "Name": "You"
                        }
                    ],
                    "Subject": subject
                }
            ]
        }

        if (html):
            data["Messages"][0]["HTMLPart"] = body
        else:
            data["Messages"][0]["TextPart"] = body

        success = mailjet.send.create(data=data)

        # For some reason returns 200 OK instead of 201 Created...
        if success.status_code != 200:
            raise Exception(f'Failed to send email: {success.json()}')

    except Exception as ex:
        logging.exception('Failed to send email.')


def send_signup_email(to, subject, id, uuid, content):
    message = render_to_string(
        'webapp:signup_email.html', {
            'url': f"https://{FRONTEND_URL}/signup/edit/{id}/{uuid}",
            'content': content,
        }
    )

    return send_email(to, subject, message)