from django.test import TestCase

from wagtail.search import index
from wagtail.tests.search.models import Book, Novel
from wagtail.tests.testapp.models import Advert, ManyToManyBlogPage


class TestSelectOnQuerySet(TestCase):
    def test_select_on_queryset_with_foreign_key(self):
        fields = index.RelatedFields('protagonist', [
            index.SearchField('name'),
        ])

        queryset = fields.select_on_queryset(Novel.objects.all())

        # ForeignKey should be select_related
        self.assertFalse(queryset._prefetch_related_lookups)
        self.assertIn('protagonist', queryset.query.select_related)

    def test_select_on_queryset_with_one_to_one(self):
        fields = index.RelatedFields('book_ptr', [
            index.SearchField('title'),
        ])

        queryset = fields.select_on_queryset(Novel.objects.all())

        # OneToOneField should be select_related
        self.assertFalse(queryset._prefetch_related_lookups)
        self.assertIn('book_ptr', queryset.query.select_related)

    def test_select_on_queryset_with_many_to_many(self):
        fields = index.RelatedFields('adverts', [
            index.SearchField('title'),
        ])

        queryset = fields.select_on_queryset(ManyToManyBlogPage.objects.all())

        # ManyToManyField should be prefetch_related
        self.assertIn('adverts', queryset._prefetch_related_lookups)
        self.assertFalse(queryset.query.select_related)

    def test_select_on_queryset_with_reverse_foreign_key(self):
        fields = index.RelatedFields('categories', [
            index.RelatedFields('category', [
                index.SearchField('name')
            ])
        ])

        queryset = fields.select_on_queryset(ManyToManyBlogPage.objects.all())

        # reverse ForeignKey should be prefetch_related
        self.assertIn('categories', queryset._prefetch_related_lookups)
        self.assertFalse(queryset.query.select_related)

    def test_select_on_queryset_with_reverse_one_to_one(self):
        fields = index.RelatedFields('novel', [
            index.SearchField('subtitle'),
        ])

        queryset = fields.select_on_queryset(Book.objects.all())

        # reverse OneToOneField should be select_related
        self.assertFalse(queryset._prefetch_related_lookups)
        self.assertIn('novel', queryset.query.select_related)

    def test_select_on_queryset_with_reverse_many_to_many(self):
        fields = index.RelatedFields('manytomanyblogpage', [
            index.SearchField('title'),
        ])

        queryset = fields.select_on_queryset(Advert.objects.all())

        # reverse ManyToManyField should be prefetch_related
        self.assertIn('manytomanyblogpage', queryset._prefetch_related_lookups)
        self.assertFalse(queryset.query.select_related)

    def test_select_on_queryset_with_taggable_manager(self):
        fields = index.RelatedFields('tags', [
            index.SearchField('name'),
        ])

        queryset = fields.select_on_queryset(Novel.objects.all())

        # Tags should be prefetch_related
        self.assertIn('tags', queryset._prefetch_related_lookups)
        self.assertFalse(queryset.query.select_related)