from rest_framework import serializers
from rest_framework.reverse import reverse

from drf_spectacular.utils import extend_schema_serializer

from access.serializers.entity import BaseSerializer as EntityBaseSerializer
from access.serializers.organization import OrganizationBaseSerializer

from api.serializers import common

from app.serializers.user import UserBaseSerializer

from core import exceptions as centurion_exception
from core import fields as centurion_field
from core.fields.badge import BadgeField
from core.models.ticket_base import TicketBase
from core.serializers.ticket_category import TicketCategoryBaseSerializer

from project_management.serializers.project import ProjectBaseSerializer
from project_management.serializers.project_milestone import ProjectMilestoneBaseSerializer



@extend_schema_serializer(component_name = 'TicketBaseBaseSerializer')
class BaseSerializer(serializers.ModelSerializer):
    """Base Ticket Model"""


    display_name = serializers.SerializerMethodField('get_display_name')

    def get_display_name(self, item) -> str:

        return str( item )

    url = serializers.SerializerMethodField('get_url')

    def get_url(self, item) -> str:

        return item.get_url( request = self.context['view'].request )


    class Meta:

        model = TicketBase

        fields = [
            'id',
            'display_name',
            'url',
        ]

        read_only_fields = [
            'id',
            'display_name',
            'url',
        ]



@extend_schema_serializer(component_name = 'TicketBaseModelSerializer')
class ModelSerializer(
    common.CommonModelSerializer,
    BaseSerializer
):
    """Ticket Base Model"""


    _urls = serializers.SerializerMethodField('get_url')

    def get_url(self, item) -> dict:

        ticket_type = str(item.ticket_type)

        url_dict: dict = {
            '_self': item.get_url( request = self._context['view'].request ),
            'comments': reverse('v2:_api_v2_ticket_comment_base-list', request=self._context['view'].request, kwargs={'ticket_id': item.pk}),
            'linked_items': reverse("v2:_api_v2_ticket_linked_item-list", request=self._context['view'].request, kwargs={'ticket_id': item.pk}),
        }

        if item.project:

            url_dict.update({
                'project': reverse("v2:_api_v2_project-list", request=self._context['view'].request, kwargs={}),
            })

        if item.category:

            url_dict.update({
            'ticketcategory': reverse(
                'v2:_api_v2_ticket_category-list',
                request=self._context['view'].request,
                kwargs={},
            ) + '?' + ticket_type + '=true',
            })


        url_dict.update({
            'related_tickets': reverse("v2:_api_v2_ticket_related-list", request=self._context['view'].request, kwargs={'ticket_id': item.pk}),
        })


        return url_dict

    description = centurion_field.MarkdownField( required = True, style_class = 'large' )

    impact_badge = BadgeField(label='Impact')

    organization = common.OrganizationField(
        required = True,
        write_only = True,
    )

    priority_badge = BadgeField(
        label = 'Priority',
        read_only = True,
    )

    status_badge = BadgeField(
        label = 'Status',
        read_only = True,
    )

    ticket_duration = serializers.IntegerField(
        help_text = 'Total time spent on ticket',
        label = 'Time Spent',
        read_only = True,
    )

    ticket_estimation = serializers.IntegerField(
        help_text = 'Time estimation to complete the ticket',
        label = 'Time estimation',
        read_only = True,
    )

    urgency_badge = BadgeField(
        label = 'Urgency',
        read_only = True,
    )


    class Meta:

        model = TicketBase

        fields = [
            'id',
            'display_name',
            'organization',
            'external_system',
            'external_ref',
            'parent_ticket',
            'ticket_type',
            'status',
            'status_badge',
            'category',
            'title',
            'description',
            'ticket_duration',
            'ticket_estimation',
            'project',
            'milestone',
            'urgency',
            'urgency_badge',
            'impact',
            'impact_badge',
            'priority',
            'priority_badge',
            'opened_by',
            'subscribed_to',
            'assigned_to',
            'planned_start_date',
            'planned_finish_date',
            'real_start_date',
            'real_finish_date',
            'is_deleted',
            'is_solved',
            'date_solved',
            'is_closed',
            'date_closed',
            'created',
            'modified',
            '_urls',
        ]

        read_only_fields = [
            'id',
            'display_name',
            'external_system',
            'external_ref',
            # 'ticket_type',
            'created',
            'modified',
            '_urls',
        ]

    

    def validate_field_milestone( self ) -> bool:

        is_valid: bool = False

        if self.instance is not None:

            if self.instance.milestone is None:

                return True

            else:

                if self.instance.project is None:

                    raise centurion_exception.ValidationError(
                        details = 'Milestones require a project',
                        code = 'milestone_requires_project',
                    )

                    return False

                if self.instance.project.id == self.instance.milestone.project.id:

                    return True

                else:

                    raise centurion_exception.ValidationError(
                        detail = 'Milestone must be from the same project',
                        code = 'milestone_same_project',
                    )

        return is_valid



    def validate(self, attrs):

        attrs = super().validate(attrs)

        if not self.validate_field_milestone:

            del attrs['milestone']


        return attrs




@extend_schema_serializer(component_name = 'TicketBaseViewSerializer')
class ViewSerializer(ModelSerializer):
    """Ticket Base View Model"""

    assigned_to = EntityBaseSerializer(many=True, label = 'assigned to')

    category = TicketCategoryBaseSerializer(label = 'category')

    milestone = ProjectMilestoneBaseSerializer(many=False, read_only=True)

    opened_by = UserBaseSerializer()

    organization = OrganizationBaseSerializer(many=False, read_only=True)

    parent_ticket = BaseSerializer()

    project = ProjectBaseSerializer(many=False, read_only=True)

    subscribed_to = EntityBaseSerializer(many=True, label = 'subscribved to')