from dal import autocomplete
from django.db.models.functions import Concat
from django.db.models import Q, Value, CharField

from .models import CertificationVersion


class CertificationVersionAutocomplete(autocomplete.Select2QuerySetView):
    def get_queryset(self):
        if not self.request.user.has_perm("membershipworks.view_certification_version"):
            return CertificationVersion.objects.none()

        qs = CertificationVersion.objects.alias(
            version_str=Concat(
                "major",
                Value("."),
                "minor",
                Value("."),
                "patch",
                output_field=CharField(),
            ),
        )

        certification_definition = self.forwarded.get("certification_definition", None)

        if certification_definition:
            qs = qs.filter(definition=certification_definition)

        if self.q:
            qs = qs.filter(
                Q(version_str__istartswith=self.q)
                | Q(prerelease__istartswith=self.q)
                | Q(approval_date__istartswith=self.q)
            )

        return qs

    def get_result_label(self, result: CertificationVersion) -> str:
        return str(result.semantic_version())

    def get_selected_result_label(self, result: CertificationVersion) -> str:
        return str(result)