from django.conf import settings

from core.exceptions.mail import NoSuchTemplate

from dbsettings.functions import getValue

import os.path

def get_provider_by_name(name, fallback=True):
    from core.modules.mail import providers
    return providers.get(name, None) or providers["smtp"]

def get_default_provider(fallback=True):
    return get_provider_by_name(getValue("core.email.provider", "smtp"), fallback)

def send_mail(provider=get_default_provider(), **kwargs):
    from core.tasks.mail import send_mail as send_mail_task
    provider = get_provider_by_name(provider) if type(provider) == str else provider
    return send_mail_task.delay(provider, **kwargs)

def simple_send_mail(subject, content, recipients, cc=[], bcc=[], headers={}):
    return send_mail(subject=subject, content=content, recipients=recipients, cc=cc, bcc=bcc, headers=headers)

def get_template(template_name, format="txt", **kwargs):
    from core.modules.mail import templates
    try:
        template = templates[template_name][format]
    except KeyError:
        raise NoSuchTemplate(f"No email template called {template_name} of format {format} loaded")

    with open(template, "r") as templatefile:
        templatetext = templatefile.read()

    for key, value in kwargs.items():
        templatetext = templatetext.replace('{§%s§}' % key, value)

    return templatetext