#
# This file is part of pretix (Community Edition).
#
# Copyright (C) 2014-2020 Raphael Michel and contributors
# Copyright (C) 2020-2021 rami.io GmbH and contributors
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General
# Public License as published by the Free Software Foundation in version 3 of the License.
#
# ADDITIONAL TERMS APPLY: Pursuant to Section 7 of the GNU Affero General Public License, additional terms are
# applicable granting you additional permissions and placing additional restrictions on your usage of this software.
# Please refer to the pretix LICENSE file to obtain the full terms applicable to this work. If you did not receive
# this file, see <https://pretix.eu/about/en/license>.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along with this program.  If not, see
# <https://www.gnu.org/licenses/>.
#

import logging
from functools import cached_property

from django.db import models
from django.utils.translation import (
    gettext as _, gettext_lazy, ngettext_lazy, pgettext_lazy,
)

from pretix.base.models import Event, Order, OrderPosition

logger = logging.getLogger(__name__)


MODE_OVERWRITE = "overwrite"
MODE_SET_IF_NEW = "if_new"
MODE_SET_IF_EMPTY = "if_empty"
MODE_APPEND_LIST = "append"


class OrderSyncQueue(models.Model):
    order = models.ForeignKey(
        Order, on_delete=models.CASCADE, related_name="queued_sync_jobs"
    )
    event = models.ForeignKey(
        Event, on_delete=models.CASCADE, related_name="queued_sync_jobs"
    )
    sync_provider = models.CharField(blank=False, null=False, max_length=128)
    triggered_by = models.CharField(blank=False, null=False, max_length=128)
    triggered = models.DateTimeField(blank=False, null=False, auto_now_add=True)
    failed_attempts = models.PositiveIntegerField(default=0)
    not_before = models.DateTimeField(blank=False, null=False, db_index=True)
    need_manual_retry = models.CharField(blank=True, null=True, choices=[
        ('recoverable', _('Temporary error, auto-retry limit exceeded')),
        ('unrecoverable', _('Misconfiguration, please check provider settings')),
        ('unhandled', _('System error, needs manual intervention'))
    ])

    class Meta:
        unique_together = (("order", "sync_provider"),)
        ordering = ("triggered",)

    @cached_property
    def _provider_class_info(self):
        from pretix.base.datasync.datasync import sync_targets
        return sync_targets.get(identifier=self.sync_provider)

    @property
    def provider_class(self):
        return self._provider_class_info[0]

    @property
    def is_provider_active(self):
        return self._provider_class_info[1]

    @property
    def max_retry_attempts(self):
        return self.provider_class.max_attempts


class OrderSyncResult(models.Model):
    order = models.ForeignKey(
        Order, on_delete=models.CASCADE, related_name="sync_results"
    )
    sync_provider = models.CharField(blank=False, null=False, max_length=128)
    order_position = models.ForeignKey(
        OrderPosition, on_delete=models.CASCADE, related_name="sync_results", blank=True, null=True,
    )
    external_object_type = models.CharField(blank=False, null=False, max_length=128)
    external_id_field = models.CharField(blank=False, null=False, max_length=128)
    id_value = models.CharField(blank=False, null=False, max_length=128)
    external_link_href = models.CharField(blank=True, null=True, max_length=255)
    external_link_display_name = models.CharField(blank=True, null=True, max_length=255)
    transmitted = models.DateTimeField(blank=False, null=False, auto_now_add=True)

    class Meta:
        indexes = [
            models.Index(fields=("order", "sync_provider")),
        ]

    def external_link_html(self):
        if not self.external_link_display_name:
            return None

        from pretix.base.datasync.datasync import sync_targets
        prov, meta = sync_targets.get(identifier=self.sync_provider)
        if prov:
            return prov.get_external_link_html(self.order.event, self.external_link_href, self.external_link_display_name)