from django.apps import apps

from . import emails


def email_event_update(sender, **kwargs):
    event = kwargs.get('event')
    diff = kwargs.get('diff')
    updater = kwargs.get('user')

    app_config = apps.get_containing_app_config(__package__)
    if not app_config.settings.enable_email_notifications:
        return

    # Who should be informed about the update?
    recipients = [event.owner]
    if event.is_flagged('submitted'):
        # If the event is already submitted, add managers to the recipients.
        from .utils import get_users_by_role
        recipients += get_users_by_role('manage_all')
        recipients += get_users_by_role('manage_{}'.format(event.sport.lower()))
        if event.is_flagged('accepted'):
            # If the event is already published, add publishers to the recipients.
            recipients += get_users_by_role('publish_incremental')

    for recipient in recipients:
        if recipient.email and recipient.email != updater.email:
            email = emails.EventUpdatedMail(recipient=recipient, event=event, diff=diff, editor=updater)
            email.send()


def email_event_status_update(sender, **kwargs):
    event = kwargs.get('event')
    flag = kwargs.get('flag')

    app_config = apps.get_containing_app_config(__package__)
    if not app_config.settings.enable_email_notifications:
        return

    if flag.status.code == 'submitted':
        # Inform event owner about his event (so he can keep the mail as a reminder for the event).
        if event.owner.email:
            email = emails.EventSubmittedMail(recipient=event.owner, event=event)
            email.send()

        # Inform managers that they have to accept the event.
        # Also create OneClickActions for all of them and add the link to the mail,
        # so they can accept the event with a click into the mail.
        from .utils import get_users_by_role
        recipients = get_users_by_role('manage_all')
        recipients += get_users_by_role('manage_{}'.format(event.sport.lower()))
        OneClickAction = app_config.get_model('OneClickAction')
        for recipient in recipients:
            if recipient.email:
                action = OneClickAction(command='EA')
                action.parameters = '{event},{user}'.format(event=event.id, user=recipient.id)
                action.save()
                email = emails.EventToAcceptMail(recipient=recipient, event=event, accept_action=action)
                email.send()

    elif flag.status.code == 'accepted':
        # Inform event owner about the acceptance of his event.
        if event.owner.email:
            email = emails.EventAcceptedMail(recipient=event.owner, event=event)
            email.send()

        # Inform publishers that they have to publish the event.
        # Also create OneClickActions for all of them and add the link to the mail,
        # so they can confirm the publication with a click into the mail.
        from .utils import get_users_by_role
        recipients = get_users_by_role('publish_incremental')
        OneClickAction = app_config.get_model('OneClickAction')
        for recipient in recipients:
            if recipient.email:
                action = OneClickAction(command='EP')
                action.parameters = '{event},{user}'.format(event=event.id, user=recipient.id)
                action.save()
                email = emails.EventToPublishMail(recipient=recipient, event=event, confirm_publication_action=action)
                email.send()