# -*- coding: utf-8 -*-
#

from django.db import models
from django.db.models import Q
from django.utils.translation import ugettext_lazy as _

from common.db.models import ChoiceSet
from common.mixins.models import CommonModelMixin
from common.fields.model import JsonDictTextField
from orgs.mixins.models import OrgModelMixin

__all__ = ['Ticket', 'Comment']


class Ticket(OrgModelMixin, CommonModelMixin):
    class STATUS(ChoiceSet):
        OPEN = 'open', _("Open")
        CLOSED = 'closed', _("Closed")

    class TYPE(ChoiceSet):
        GENERAL = 'general', _("General")
        LOGIN_CONFIRM = 'login_confirm', _("Login confirm")
        REQUEST_ASSET_PERM = 'request_asset', _('Request asset permission')

    class ACTION(ChoiceSet):
        APPROVE = 'approve', _('Approve')
        REJECT = 'reject', _('Reject')

    user = models.ForeignKey('users.User', on_delete=models.SET_NULL, null=True, related_name='%(class)s_requested', verbose_name=_("User"))
    user_display = models.CharField(max_length=128, verbose_name=_("User display name"))

    title = models.CharField(max_length=256, verbose_name=_("Title"))
    body = models.TextField(verbose_name=_("Body"))
    meta = JsonDictTextField(verbose_name=_("Meta"), default='{}')
    assignee = models.ForeignKey('users.User', on_delete=models.SET_NULL, null=True, related_name='%(class)s_handled', verbose_name=_("Assignee"))
    assignee_display = models.CharField(max_length=128, blank=True, null=True, verbose_name=_("Assignee display name"), default='')
    assignees = models.ManyToManyField('users.User', related_name='%(class)s_assigned', verbose_name=_("Assignees"))
    assignees_display = models.CharField(max_length=128, verbose_name=_("Assignees display name"), blank=True)
    type = models.CharField(max_length=16, choices=TYPE.choices, default=TYPE.GENERAL, verbose_name=_("Type"))
    status = models.CharField(choices=STATUS.choices, max_length=16, default='open')
    action = models.CharField(choices=ACTION.choices, max_length=16, default='', blank=True)
    comment = models.TextField(default='', blank=True, verbose_name=_('Comment'))

    origin_objects = models.Manager()

    def __str__(self):
        return '{}: {}'.format(self.user_display, self.title)

    @property
    def body_as_html(self):
        return self.body.replace('\n', '<br/>')

    @property
    def status_display(self):
        return self.get_status_display()

    @property
    def type_display(self):
        return self.get_type_display()

    @property
    def action_display(self):
        return self.get_action_display()

    def create_status_comment(self, status, user):
        if status == self.STATUS.CLOSED:
            action = _("Close")
        else:
            action = _("Open")
        body = _('{} {} this ticket').format(self.user, action)
        self.comments.create(user=user, body=body)

    def perform_status(self, status, user, extra_comment=None):
        self.create_comment(
            self.STATUS.get(status),
            user,
            extra_comment
        )
        self.status = status
        self.assignee = user
        self.save()

    def create_comment(self, action_display, user, extra_comment=None):
        body = '{} {} {}'.format(user, action_display, _("this ticket"))
        if extra_comment is not None:
            body += extra_comment
        self.comments.create(body=body, user=user, user_display=str(user))

    def perform_action(self, action, user, extra_comment=None):
        self.create_comment(
            self.ACTION.get(action),
            user,
            extra_comment
        )
        self.action = action
        self.status = self.STATUS.CLOSED
        self.assignee = user
        self.save()

    def is_assignee(self, user):
        return self.assignees.filter(id=user.id).exists()

    def is_user(self, user):
        return self.user == user

    @classmethod
    def get_related_tickets(cls, user, queryset=None):
        if queryset is None:
            queryset = cls.objects.all()
        queryset = queryset.filter(
            Q(assignees=user) | Q(user=user)
        ).distinct()
        return queryset

    @classmethod
    def get_assigned_tickets(cls, user, queryset=None):
        if queryset is None:
            queryset = cls.objects.all()
        queryset = queryset.filter(assignees=user)
        return queryset

    @classmethod
    def get_my_tickets(cls, user, queryset=None):
        if queryset is None:
            queryset = cls.objects.all()
        queryset = queryset.filter(user=user)
        return queryset

    class Meta:
        ordering = ('-date_created',)


class Comment(CommonModelMixin):
    ticket = models.ForeignKey(Ticket, on_delete=models.CASCADE, related_name='comments')
    user = models.ForeignKey('users.User', on_delete=models.SET_NULL, null=True, verbose_name=_("User"), related_name='comments')
    user_display = models.CharField(max_length=128, verbose_name=_("User display name"))
    body = models.TextField(verbose_name=_("Body"))

    class Meta:
        ordering = ('date_created', )