# Copyright © Michal Čihař <michal@weblate.org>
#
# SPDX-License-Identifier: GPL-3.0-or-later

import os.path
import tempfile
from difflib import get_close_matches
from itertools import chain
from shutil import copyfile

from django.core.files import File
from django.urls import reverse
from django.utils import timezone
from rest_framework.test import APITestCase

from weblate.lang.models import Language
from weblate.screenshots.models import Screenshot
from weblate.screenshots.views import get_tesseract, ocr_get_strings
from weblate.trans.tests.test_models import RepoTestCase
from weblate.trans.tests.test_views import FixtureTestCase
from weblate.trans.tests.utils import create_test_user, get_test_file
from weblate.utils.db import using_postgresql

TEST_SCREENSHOT = get_test_file("screenshot.png")


class ViewTest(FixtureTestCase):
    @classmethod
    def _databases_support_transactions(cls):
        # This is workaround for MySQL as FULL TEXT index does not work
        # well inside a transaction, so we avoid using transactions for
        # tests. Otherwise we end up with no matches for the query.
        # See https://dev.mysql.com/doc/refman/5.6/en/innodb-fulltext-index.html
        if not using_postgresql():
            return False
        return super()._databases_support_transactions()

    def test_list_empty(self):
        response = self.client.get(reverse("screenshots", kwargs=self.kw_component))
        self.assertContains(response, "Screenshots")

    def do_upload(self, **kwargs):
        with open(TEST_SCREENSHOT, "rb") as handle:
            data = {
                "image": handle,
                "name": "Obrazek",
                "translation": self.component.source_translation.pk,
            }
            data.update(kwargs)
            return self.client.post(
                reverse("screenshots", kwargs=self.kw_component),
                data,
                follow=True,
            )

    def test_upload_denied(self):
        response = self.do_upload()
        self.assertEqual(response.status_code, 403)

    def test_upload(self):
        self.make_manager()
        response = self.do_upload()
        self.assertContains(response, "Obrazek")
        self.assertEqual(Screenshot.objects.count(), 1)

    def test_upload_fail(self):
        self.make_manager()
        response = self.do_upload(name="")
        self.assertContains(response, "Could not upload screenshot")
        response = self.do_upload(image="")
        self.assertContains(response, "Could not upload screenshot")

    def test_upload_source(self):
        self.make_manager()
        source = self.component.source_translation.unit_set.all()[0]
        response = self.do_upload(source=source.pk)
        self.assertContains(response, "Obrazek")
        self.assertEqual(Screenshot.objects.count(), 1)
        screenshot = Screenshot.objects.all()[0]
        self.assertEqual(screenshot.name, "Obrazek")
        self.assertEqual(screenshot.units.count(), 1)

    def test_upload_source_invalid(self):
        self.make_manager()
        response = self.do_upload(source="wrong")
        self.assertContains(response, "Obrazek")

    def test_edit(self):
        self.make_manager()
        self.do_upload()
        screenshot = Screenshot.objects.all()[0]
        response = self.client.post(
            screenshot.get_absolute_url(), {"name": "Picture"}, follow=True
        )
        self.assertContains(response, "Picture")
        self.assertEqual(Screenshot.objects.all()[0].name, "Picture")

    def test_delete(self):
        self.make_manager()
        self.do_upload()
        screenshot = Screenshot.objects.all()[0]
        self.client.post(reverse("screenshot-delete", kwargs={"pk": screenshot.pk}))
        self.assertEqual(Screenshot.objects.count(), 0)

    def extract_pk(self, data):
        return int(data.split('data-pk="')[1].split('"')[0])

    def test_source_manipulations(self):
        self.make_manager()
        self.do_upload()
        screenshot = Screenshot.objects.all()[0]

        # Search for string
        response = self.client.post(
            reverse("screenshot-js-search", kwargs={"pk": screenshot.pk}),
            {"q": "hello"},
        )
        data = response.json()
        self.assertEqual(data["responseCode"], 200)
        self.assertIn('<a class="add-string', data["results"])

        source_pk = self.extract_pk(data["results"])

        self.assertEqual(
            source_pk,
            self.component.source_translation.unit_set.search("hello").get().pk,
        )

        # Add found string
        response = self.client.post(
            reverse("screenshot-js-add", kwargs={"pk": screenshot.pk}),
            {"source": source_pk},
        )
        data = response.json()
        self.assertEqual(data["responseCode"], 200)
        self.assertEqual(data["status"], True)
        self.assertEqual(screenshot.units.count(), 1)

        # Updated listing
        response = self.client.get(
            reverse("screenshot-js-get", kwargs={"pk": screenshot.pk})
        )
        self.assertContains(response, "Hello")

        # Remove added string
        self.client.post(
            reverse("screenshot-remove-source", kwargs={"pk": screenshot.pk}),
            {"source": source_pk},
        )
        self.assertEqual(screenshot.units.count(), 0)

    def test_ocr_backend(self):
        # Extract strings
        with get_tesseract(Language.objects.get(code="en")) as api:
            result = list(ocr_get_strings(api, TEST_SCREENSHOT, 72))

        # Reverse logic would make sense here, but we want to use same order as in views.py
        matches = list(
            chain.from_iterable(
                get_close_matches(part, ["Hello, world!\n"], cutoff=0.9)
                for part in result
            )
        )

        self.assertTrue(
            matches, f"Could not find string in tesseract results: {result}"
        )

    def test_ocr(self):
        self.make_manager()
        self.do_upload()
        screenshot = Screenshot.objects.all()[0]

        # Search for string
        response = self.client.post(
            reverse("screenshot-js-ocr", kwargs={"pk": screenshot.pk})
        )
        data = response.json()

        self.assertEqual(data["responseCode"], 200)
        # We should find at least one string
        self.assertIn(
            '<a class="add-string',
            data["results"],
            "OCR recognition not working, no recognized strings found",
        )

    def test_translation_manipulations(self):
        self.make_manager()
        translation = self.component.translation_set.get(language_code="cs")
        self.do_upload(translation=translation.pk)
        screenshot = Screenshot.objects.all()[0]

        # Search for string
        response = self.client.post(
            reverse("screenshot-js-search", kwargs={"pk": screenshot.pk}),
            {"q": "hello"},
        )
        data = response.json()
        self.assertEqual(data["responseCode"], 200)
        self.assertIn('<a class="add-string', data["results"])

        source_pk = self.extract_pk(data["results"])
        self.assertEqual(source_pk, translation.unit_set.search("hello").get().pk)

        # Add found string
        response = self.client.post(
            reverse("screenshot-js-add", kwargs={"pk": screenshot.pk}),
            {"source": source_pk},
        )
        data = response.json()
        self.assertEqual(data["responseCode"], 200)
        self.assertEqual(data["status"], True)
        self.assertEqual(screenshot.units.count(), 1)

        # Updated listing
        response = self.client.get(
            reverse("screenshot-js-get", kwargs={"pk": screenshot.pk})
        )
        self.assertContains(response, "Hello")

        # Remove added string
        self.client.post(
            reverse("screenshot-remove-source", kwargs={"pk": screenshot.pk}),
            {"source": source_pk},
        )
        self.assertEqual(screenshot.units.count(), 0)


class ScreenshotVCSTest(APITestCase, RepoTestCase):
    """Test class for syncing vcs screenshots in weblate."""

    def setUp(self):
        super().setUp()
        self.user = create_test_user()
        self.user.is_superuser = True
        self.user.save()
        self.client.credentials(HTTP_AUTHORIZATION="Token " + self.user.auth_token.key)
        self.client.login(username="testuser", password="testpassword")

        self.component = self._create_component(
            "json",
            "intermediate/*.json",
            screenshot_filemask="*.png",
        )

        # Add a screenshot linked to the component
        shot = Screenshot.objects.create(
            name="test-update",
            translation=self.component.source_translation,
            repository_filename="test-update.png",
        )
        with open(TEST_SCREENSHOT, "rb") as handle:
            data = handle.read()
            half_data_size = len(data) // 2
            with tempfile.NamedTemporaryFile(suffix="png") as temp_file:
                temp_file.write(data[:half_data_size])
                temp_file.flush()
                temp_file.seek(0)
                shot.image.save("test-update", File(temp_file))

    def test_update_screenshots_from_repo(self):
        repository = self.component.repository
        last_revision = repository.last_revision
        existing_ss_size = Screenshot.objects.filter(
            translation__component=self.component,
            repository_filename="test-update.png",
        )[0].image.size

        copyfile(TEST_SCREENSHOT, os.path.join(repository.path, "test-update.png"))
        with repository.lock:
            repository.set_committer("Second Bar", "second@example.net")
            filenames = ["test-update.png"]
            repository.commit(
                "Test commit", "Foo Bar <foo@bar.com>", timezone.now(), filenames
            )
            self.component.trigger_post_update(last_revision, skip_push=True)

        # Verify that screenshot has been updated after the signal.
        self.assertEqual(
            Screenshot.objects.filter(
                translation__component=self.component,
                repository_filename="test-update.png",
            ).count(),
            1,
        )
        updated_ss_size = Screenshot.objects.filter(
            translation__component=self.component,
            repository_filename="test-update.png",
        )[0].image.size
        self.assertNotEqual(existing_ss_size, updated_ss_size)

    def test_add_screenshots_from_repo(self):
        repository = self.component.repository
        last_revision = repository.last_revision

        copyfile(TEST_SCREENSHOT, os.path.join(repository.path, "test.png"))
        with repository.lock:
            repository.set_committer("Second Bar", "second@example.net")
            filenames = ["test.png"]
            repository.commit(
                "Test commit", "Foo Bar <foo@bar.com>", timezone.now(), filenames
            )
            self.component.trigger_post_update(last_revision, skip_push=True)

        # Verify that screenshot has been added after the signal.
        self.assertEqual(
            Screenshot.objects.filter(
                translation__component=self.component,
                repository_filename="test.png",
            ).count(),
            1,
        )
