import types
from unittest.mock import patch

import tantivy
from django.contrib.admin.sites import AdminSite
from django.contrib.auth.models import Permission
from django.contrib.auth.models import User
from django.test import TestCase
from django.utils import timezone
from rest_framework import status

from documents.admin import DocumentAdmin
from documents.admin import TagAdmin
from documents.models import Document
from documents.models import Tag
from documents.search import get_backend
from documents.search import reset_backend
from documents.tests.utils import DirectoriesMixin
from paperless.admin import PaperlessUserAdmin


class TestDocumentAdmin(DirectoriesMixin, TestCase):
    def get_document_from_index(self, doc):
        backend = get_backend()
        searcher = backend._index.searcher()
        results = searcher.search(
            tantivy.Query.range_query(
                backend._schema,
                "id",
                tantivy.FieldType.Unsigned,
                doc.pk,
                doc.pk,
            ),
            limit=1,
        )
        if results.hits:
            return searcher.doc(results.hits[0][1]).to_dict()
        return None

    def setUp(self) -> None:
        super().setUp()
        reset_backend()
        self.doc_admin = DocumentAdmin(model=Document, admin_site=AdminSite())

    def tearDown(self) -> None:
        reset_backend()
        super().tearDown()

    def test_save_model(self) -> None:
        doc = Document.objects.create(title="test")

        doc.title = "new title"
        self.doc_admin.save_model(None, doc, None, None)
        self.assertEqual(Document.objects.get(id=doc.id).title, "new title")
        self.assertEqual(self.get_document_from_index(doc)["id"], [doc.id])

    def test_delete_model(self) -> None:
        doc = Document.objects.create(title="test")
        get_backend().add_or_update(doc)
        self.assertIsNotNone(self.get_document_from_index(doc))

        self.doc_admin.delete_model(None, doc)

        self.assertRaises(Document.DoesNotExist, Document.objects.get, id=doc.id)
        self.assertIsNone(self.get_document_from_index(doc))

    def test_delete_queryset(self) -> None:
        docs = []
        for i in range(42):
            doc = Document.objects.create(
                title="Many documents with the same title",
                checksum=f"{i:02}",
            )
            docs.append(doc)
            get_backend().add_or_update(doc)

        self.assertEqual(Document.objects.count(), 42)

        for doc in docs:
            self.assertIsNotNone(self.get_document_from_index(doc))

        self.doc_admin.delete_queryset(None, Document.objects.all())

        self.assertEqual(Document.objects.count(), 0)

        for doc in docs:
            self.assertIsNone(self.get_document_from_index(doc))

    def test_created(self) -> None:
        doc = Document.objects.create(
            title="test",
            created=timezone.make_aware(timezone.datetime(2020, 4, 12)),
        )
        self.assertEqual(self.doc_admin.created_(doc), "2020-04-12")


class TestTagAdmin(DirectoriesMixin, TestCase):
    def setUp(self) -> None:
        super().setUp()
        self.tag_admin = TagAdmin(model=Tag, admin_site=AdminSite())

    @patch("documents.tasks.bulk_update_documents")
    def test_parent_tags_get_added(self, mock_bulk_update):
        document = Document.objects.create(title="test")
        parent = Tag.objects.create(name="parent")
        child = Tag.objects.create(name="child")
        document.tags.add(child)

        child.tn_parent = parent
        self.tag_admin.save_model(None, child, None, change=True)
        document.refresh_from_db()
        self.assertIn(parent, document.tags.all())


class TestPaperlessAdmin(DirectoriesMixin, TestCase):
    def setUp(self) -> None:
        super().setUp()
        self.user_admin = PaperlessUserAdmin(model=User, admin_site=AdminSite())

    def test_request_is_passed_to_form(self) -> None:
        user = User.objects.create(username="test", is_superuser=False)
        non_superuser = User.objects.create(username="requestuser")
        request = types.SimpleNamespace(user=non_superuser)
        formType = self.user_admin.get_form(request)
        form = formType(data={}, instance=user)
        self.assertEqual(form.request, request)

    def test_only_superuser_can_change_superuser(self) -> None:
        superuser = User.objects.create_superuser(username="superuser", password="test")
        non_superuser = User.objects.create(username="requestuser")
        user = User.objects.create(username="test", is_superuser=False)

        data = {
            "username": "test",
            "is_superuser": True,
        }
        form = self.user_admin.form(data, instance=user)
        form.request = types.SimpleNamespace(user=non_superuser)
        self.assertFalse(form.is_valid())
        self.assertEqual(
            form.errors.get("__all__"),
            ["Superuser status can only be changed by a superuser"],
        )

        form = self.user_admin.form(data, instance=user)
        form.request = types.SimpleNamespace(user=superuser)
        self.assertTrue(form.is_valid())
        self.assertEqual({}, form.errors)

    def test_superuser_can_only_be_modified_by_superuser(self) -> None:
        superuser = User.objects.create_superuser(username="superuser", password="test")
        user = User.objects.create(
            username="test",
            is_superuser=False,
            is_staff=True,
        )
        change_user_perm = Permission.objects.get(codename="change_user")
        user.user_permissions.add(change_user_perm)

        self.client.force_login(user)
        response = self.client.patch(
            f"/api/users/{superuser.pk}/",
            {"first_name": "Updated"},
            content_type="application/json",
        )
        self.assertEqual(response.status_code, status.HTTP_403_FORBIDDEN)
        self.assertEqual(
            response.content.decode(),
            "Superusers can only be modified by other superusers",
        )

        self.client.logout()
        self.client.force_login(superuser)
        response = self.client.patch(
            f"/api/users/{superuser.pk}/",
            {"first_name": "Updated"},
            content_type="application/json",
        )
        self.assertEqual(response.status_code, status.HTTP_200_OK)
        superuser.refresh_from_db()
        self.assertEqual(superuser.first_name, "Updated")