from __future__ import absolute_import, unicode_literals

from datetime import timedelta

from django import apps
from django.utils.translation import ugettext_lazy as _

from acls.api import class_permissions
from common.menus import menu_facet, menu_main, menu_sidebar
from documents.models import Document
from mayan.celery import app
from rest_api.classes import APIEndPoint

from .links import (
    link_checkin_document, link_checkout_document, link_checkout_info,
    link_checkout_list
)
from .models import DocumentCheckout
from .permissions import (
    PERMISSION_DOCUMENT_CHECKIN, PERMISSION_DOCUMENT_CHECKIN_OVERRIDE,
    PERMISSION_DOCUMENT_CHECKOUT, PERMISSION_DOCUMENT_RESTRICTIONS_OVERRIDE
)

CHECK_EXPIRED_CHECK_OUTS_INTERVAL = 60  # Lowest check out expiration allowed


class CheckoutsApp(apps.AppConfig):
    name = 'checkouts'
    verbose_name = _('Checkouts')

    def ready(self):
        Document.add_to_class('is_checked_out', lambda document: DocumentCheckout.objects.is_document_checked_out(document))
        Document.add_to_class('check_in', lambda document, user=None: DocumentCheckout.objects.check_in_document(document, user))
        Document.add_to_class('checkout_info', lambda document: DocumentCheckout.objects.document_checkout_info(document))
        Document.add_to_class('checkout_state', lambda document: DocumentCheckout.objects.document_checkout_state(document))
        Document.add_to_class('is_new_versions_allowed', lambda document, user=None: DocumentCheckout.objects.is_document_new_versions_allowed(document, user))

        app.conf.CELERYBEAT_SCHEDULE.update({
            'check_expired_check_outs': {
                'task': 'checkouts.tasks.task_check_expired_check_outs',
                'schedule': timedelta(seconds=CHECK_EXPIRED_CHECK_OUTS_INTERVAL),
                'options': {'queue': 'checkouts'}
            },
        })

        class_permissions(Document, [
            PERMISSION_DOCUMENT_CHECKOUT,
            PERMISSION_DOCUMENT_CHECKIN,
            PERMISSION_DOCUMENT_CHECKIN_OVERRIDE,
            PERMISSION_DOCUMENT_RESTRICTIONS_OVERRIDE
        ])

        menu_facet.bind_links(links=[link_checkout_info], sources=[Document])
        menu_main.bind_links(links=[link_checkout_list])
        menu_sidebar.bind_links(links=[link_checkout_document, link_checkin_document], sources=['checkouts:checkout_info', 'checkouts:checkout_document', 'checkouts:checkin_document'])

        APIEndPoint('checkouts')