#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
import uuid
from functools import reduce

from celery import current_task
from django.db import models
from django.utils.translation import ugettext_lazy as _

from orgs.mixins.models import OrgModelMixin
from ops.mixin import PeriodTaskModelMixin
from common.utils import get_logger
from common.db.encoder import ModelJSONFieldEncoder
from common.db.models import BitOperationChoice
from common.mixins.models import CommonModelMixin
from common.const.choices import Trigger
from ..const import AllTypes, Category

__all__ = ['AccountBackupPlan', 'AccountBackupPlanExecution', 'Type']

logger = get_logger(__file__)


def _choice_map(default=None):
    offset = 0
    temp_key = 0b1

    if default is None:
        _all = (0b1 << 32) - 1
    else:
        _all = default

    choices = {
        _all: ('all', 'All')
    }

    for info in AllTypes.grouped_choices_to_objs():
        temp_keys = []
        for c in info['children']:
            key = temp_key << offset
            temp_keys.append(key)
            choices[key] = (c['value'], c['display_name'])
            offset += 1
        parent_key = reduce(lambda x, y: x | y, temp_keys)
        choices[parent_key] = (info['value'], info['display_name'])
    return choices


class Type(BitOperationChoice):
    NONE = 0

    ALL = (0b1 << 32) - 1
    TYPE_MAP = _choice_map(ALL)

    DB_CHOICES = tuple((k, v[1]) for k, v in TYPE_MAP.items())

    NAME_MAP = {k: v[0] for k, v in TYPE_MAP.items()}

    NAME_MAP_REVERSE = {v: k for k, v in NAME_MAP.items()}
    CHOICES = []
    for i, j in DB_CHOICES:
        CHOICES.append((NAME_MAP[i], j))

    @classmethod
    def get_types(cls, value: int) -> list:
        exclude_types = ['all'] + Category.values
        current_all = cls.value_to_choices(value)
        return list(filter(lambda x: x not in exclude_types, current_all))


class AccountBackupPlan(CommonModelMixin, PeriodTaskModelMixin, OrgModelMixin):
    id = models.UUIDField(default=uuid.uuid4, primary_key=True)
    types = models.BigIntegerField()
    recipients = models.ManyToManyField(
        'users.User', related_name='recipient_escape_route_plans', blank=True,
        verbose_name=_("Recipient")
    )
    comment = models.TextField(blank=True, verbose_name=_('Comment'))

    def __str__(self):
        return f'{self.name}({self.org_id})'

    class Meta:
        ordering = ['name']
        unique_together = [('name', 'org_id')]
        verbose_name = _('Account backup plan')

    def get_register_task(self):
        from ..tasks import execute_account_backup_plan
        name = "account_backup_plan_period_{}".format(str(self.id)[:8])
        task = execute_account_backup_plan.name
        args = (str(self.id), Trigger.timing)
        kwargs = {}
        return name, task, args, kwargs

    def to_attr_json(self):
        return {
            'name': self.name,
            'is_periodic': self.is_periodic,
            'interval': self.interval,
            'crontab': self.crontab,
            'org_id': self.org_id,
            'created_by': self.created_by,
            'types': Type.get_types(self.types),
            'recipients': {
                str(recipient.id): (str(recipient), bool(recipient.secret_key))
                for recipient in self.recipients.all()
            }
        }

    def execute(self, trigger):
        try:
            hid = current_task.request.id
        except AttributeError:
            hid = str(uuid.uuid4())
        execution = AccountBackupPlanExecution.objects.create(
            id=hid, plan=self, plan_snapshot=self.to_attr_json(), trigger=trigger
        )
        return execution.start()


class AccountBackupPlanExecution(OrgModelMixin):
    id = models.UUIDField(default=uuid.uuid4, primary_key=True)
    date_start = models.DateTimeField(
        auto_now_add=True, verbose_name=_('Date start')
    )
    timedelta = models.FloatField(
        default=0.0, verbose_name=_('Time'), null=True
    )
    plan_snapshot = models.JSONField(
        encoder=ModelJSONFieldEncoder, default=dict,
        blank=True, null=True, verbose_name=_('Account backup snapshot')
    )
    trigger = models.CharField(
        max_length=128, default=Trigger.manual, choices=Trigger.choices,
        verbose_name=_('Trigger mode')
    )
    reason = models.CharField(
        max_length=1024, blank=True, null=True, verbose_name=_('Reason')
    )
    is_success = models.BooleanField(default=False, verbose_name=_('Is success'))
    plan = models.ForeignKey(
        'AccountBackupPlan', related_name='execution', on_delete=models.CASCADE,
        verbose_name=_('Account backup plan')
    )

    class Meta:
        verbose_name = _('Account backup execution')

    @property
    def types(self):
        types = self.plan_snapshot.get('types')
        return types

    @property
    def recipients(self):
        recipients = self.plan_snapshot.get('recipients')
        if not recipients:
            return []
        return recipients.values()

    def start(self):
        from ..task_handlers import ExecutionManager
        manager = ExecutionManager(execution=self)
        return manager.run()