"""Webapp utils."""

import logging
import base64
import uuid
import imghdr
import markdown
import sendgrid
from django.utils import timezone
from sendgrid.helpers.mail import (
    Email,
    To,
    Subject,
    Mail,
    HtmlContent,
    PlainTextContent,
)
from django.template.loader import render_to_string
from django.core.files.base import ContentFile
from sikweb.settings import (
    FRONTEND_URL,
    EMAIL_API_KEY,
    DEFAULT_EMAIL_FROM,
    DEFAULT_EMAIL_FROM_ADDR,
    ENABLE_AUTOMATIC_EMAILS,
)
from datetime import timedelta


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: str, subject: str, body: str, html: bool = False):
    if ENABLE_AUTOMATIC_EMAILS is False:
        logging.debug("Skipping email")
        logging.debug(f"to: {to}")
        logging.debug(f"subject: {subject}")
        logging.debug(f"body: {body}")
        return

    from_email = Email(email=DEFAULT_EMAIL_FROM_ADDR, name=DEFAULT_EMAIL_FROM)
    to_email = To(email=to)
    sub = Subject(subject=subject)

    html_content = None
    plain_text_content = None
    if html:
        html_content = HtmlContent(content=body)
    else:
        plain_text_content = PlainTextContent(content=body)

    mail = Mail(
        from_email=from_email,
        to_emails=to_email,
        subject=sub,
        html_content=html_content,
        plain_text_content=plain_text_content,
    )

    try:
        sg = sendgrid.SendGridAPIClient(api_key=EMAIL_API_KEY)
        response = sg.send(mail)

        if response.status_code != 202:
            raise Exception(f"Failed to send email: {response.body}")

    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": markdown.markdown(content),
        },
    )

    return send_email(to, subject, message, True)


def admin_send_email_signupees(list, subject, content):
    for to in list:
        send_email(to.email, subject, markdown.markdown(content), True)