from unittest.mock import Mock

from rest_framework import serializers

from misago.acl import useracl
from misago.acl.test import patch_user_acl
from misago.categories.models import Category
from misago.conf import settings
from misago.conftest import get_cache_versions
from misago.threads import test
from misago.threads.api.postingendpoint import PostingEndpoint
from misago.threads.api.postingendpoint.attachments import (
    AttachmentsMiddleware,
    validate_attachments_count,
)
from misago.threads.models import Attachment, AttachmentType
from misago.users.test import AuthenticatedUserTestCase

cache_versions = get_cache_versions()


def patch_attachments_acl(acl_patch=None):
    acl_patch = acl_patch or {}
    acl_patch.setdefault("max_attachment_size", 1024)
    return patch_user_acl(acl_patch)


class AttachmentsMiddlewareTests(AuthenticatedUserTestCase):
    def setUp(self):
        super().setUp()

        self.category = Category.objects.get(slug="first-category")
        self.thread = test.post_thread(category=self.category)
        self.post = self.thread.first_post

        self.post.update_fields = []

        self.filetype = AttachmentType.objects.order_by("id").last()

    def mock_attachment(self, user=True, post=None):
        return Attachment.objects.create(
            secret=Attachment.generate_new_secret(),
            filetype=self.filetype,
            post=post,
            size=1000,
            uploader=self.user if user else None,
            uploader_name=self.user.username,
            uploader_slug=self.user.slug,
            filename="testfile_%s.zip" % (Attachment.objects.count() + 1),
        )

    def test_use_this_middleware(self):
        """use_this_middleware returns False if we can't upload attachments"""
        with patch_user_acl({"max_attachment_size": 0}):
            user_acl = useracl.get_user_acl(self.user, cache_versions)
            middleware = AttachmentsMiddleware(user=self.user, user_acl=user_acl)
            self.assertFalse(middleware.use_this_middleware())

        with patch_user_acl({"max_attachment_size": 1024}):
            user_acl = useracl.get_user_acl(self.user, cache_versions)
            middleware = AttachmentsMiddleware(user=self.user, user_acl=user_acl)
            self.assertTrue(middleware.use_this_middleware())

    @patch_attachments_acl()
    def test_middleware_is_optional(self):
        """middleware is optional"""
        INPUTS = [{}, {"attachments": []}]

        user_acl = useracl.get_user_acl(self.user, cache_versions)

        for test_input in INPUTS:
            middleware = AttachmentsMiddleware(
                request=Mock(data=test_input),
                mode=PostingEndpoint.START,
                user=self.user,
                user_acl=user_acl,
                post=self.post,
            )

            serializer = middleware.get_serializer()
            self.assertTrue(serializer.is_valid())

    @patch_attachments_acl()
    def test_middleware_validates_ids(self):
        """middleware validates attachments ids"""
        INPUTS = [
            "none",
            ["a", "b", 123],
            range(settings.MISAGO_POST_ATTACHMENTS_LIMIT + 1),
        ]

        user_acl = useracl.get_user_acl(self.user, cache_versions)

        for test_input in INPUTS:
            middleware = AttachmentsMiddleware(
                request=Mock(data={"attachments": test_input}),
                mode=PostingEndpoint.START,
                user=self.user,
                user_acl=user_acl,
                post=self.post,
            )

            serializer = middleware.get_serializer()
            self.assertFalse(
                serializer.is_valid(), "%r shouldn't validate" % test_input
            )

    @patch_attachments_acl()
    def test_get_initial_attachments(self):
        """get_initial_attachments returns list of attachments already existing on post"""
        user_acl = useracl.get_user_acl(self.user, cache_versions)
        middleware = AttachmentsMiddleware(
            request=Mock(data={}),
            mode=PostingEndpoint.EDIT,
            user=self.user,
            user_acl=user_acl,
            post=self.post,
        )

        serializer = middleware.get_serializer()

        attachments = serializer.get_initial_attachments(
            middleware.mode, middleware.user, middleware.post
        )
        self.assertEqual(attachments, [])

        attachment = self.mock_attachment(post=self.post)
        attachments = serializer.get_initial_attachments(
            middleware.mode, middleware.user_acl, middleware.post
        )
        self.assertEqual(attachments, [attachment])

    @patch_attachments_acl()
    def test_get_new_attachments(self):
        """get_initial_attachments returns list of attachments already existing on post"""
        user_acl = useracl.get_user_acl(self.user, cache_versions)
        middleware = AttachmentsMiddleware(
            request=Mock(data={}),
            mode=PostingEndpoint.EDIT,
            user=self.user,
            user_acl=user_acl,
            post=self.post,
        )

        serializer = middleware.get_serializer()

        attachments = serializer.get_new_attachments(middleware.user, [1, 2, 3])
        self.assertEqual(attachments, [])

        attachment = self.mock_attachment()
        attachments = serializer.get_new_attachments(middleware.user, [attachment.pk])
        self.assertEqual(attachments, [attachment])

        # only own orphaned attachments may be assigned to posts
        other_user_attachment = self.mock_attachment(user=False)
        attachments = serializer.get_new_attachments(
            middleware.user, [other_user_attachment.pk]
        )
        self.assertEqual(attachments, [])

    @patch_attachments_acl({"can_delete_other_users_attachments": False})
    def test_cant_delete_attachment(self):
        """middleware validates if we have permission to delete other users attachments"""
        attachment = self.mock_attachment(user=False, post=self.post)
        self.assertIsNone(attachment.uploader)

        user_acl = useracl.get_user_acl(self.user, cache_versions)
        serializer = AttachmentsMiddleware(
            request=Mock(data={"attachments": []}),
            mode=PostingEndpoint.EDIT,
            user=self.user,
            user_acl=user_acl,
            post=self.post,
        ).get_serializer()

        self.assertFalse(serializer.is_valid())

    @patch_attachments_acl()
    def test_add_attachments(self):
        """middleware adds attachments to post"""
        attachments = [self.mock_attachment(), self.mock_attachment()]

        user_acl = useracl.get_user_acl(self.user, cache_versions)
        middleware = AttachmentsMiddleware(
            request=Mock(data={"attachments": [a.pk for a in attachments]}),
            mode=PostingEndpoint.EDIT,
            user=self.user,
            user_acl=user_acl,
            post=self.post,
        )

        serializer = middleware.get_serializer()
        self.assertTrue(serializer.is_valid())
        middleware.save(serializer)

        # attachments were associated with post
        self.assertEqual(self.post.update_fields, ["attachments_cache"])
        self.assertEqual(self.post.attachment_set.count(), 2)

        attachments_filenames = list(reversed([a.filename for a in attachments]))
        self.assertEqual(
            [a["filename"] for a in self.post.attachments_cache], attachments_filenames
        )

    @patch_attachments_acl()
    def test_remove_attachments(self):
        """middleware removes attachment from post and db"""
        attachments = [
            self.mock_attachment(post=self.post),
            self.mock_attachment(post=self.post),
        ]

        user_acl = useracl.get_user_acl(self.user, cache_versions)
        middleware = AttachmentsMiddleware(
            request=Mock(data={"attachments": [attachments[0].pk]}),
            mode=PostingEndpoint.EDIT,
            user=self.user,
            user_acl=user_acl,
            post=self.post,
        )

        serializer = middleware.get_serializer()
        self.assertTrue(serializer.is_valid())
        middleware.save(serializer)

        # attachments were associated with post
        self.assertEqual(self.post.update_fields, ["attachments_cache"])
        self.assertEqual(self.post.attachment_set.count(), 1)

        self.assertEqual(Attachment.objects.count(), 1)

        attachments_filenames = [attachments[0].filename]
        self.assertEqual(
            [a["filename"] for a in self.post.attachments_cache], attachments_filenames
        )

    @patch_attachments_acl()
    def test_steal_attachments(self):
        """middleware validates if attachments are already assigned to other posts"""
        other_post = test.reply_thread(self.thread)

        attachments = [self.mock_attachment(post=other_post), self.mock_attachment()]

        user_acl = useracl.get_user_acl(self.user, cache_versions)
        middleware = AttachmentsMiddleware(
            request=Mock(data={"attachments": [attachments[0].pk, attachments[1].pk]}),
            mode=PostingEndpoint.EDIT,
            user=self.user,
            user_acl=user_acl,
            post=self.post,
        )

        serializer = middleware.get_serializer()
        self.assertTrue(serializer.is_valid())
        middleware.save(serializer)

        # only unassociated attachment was associated with post
        self.assertEqual(self.post.update_fields, ["attachments_cache"])
        self.assertEqual(self.post.attachment_set.count(), 1)

        self.assertEqual(Attachment.objects.get(pk=attachments[0].pk).post, other_post)
        self.assertEqual(Attachment.objects.get(pk=attachments[1].pk).post, self.post)

    @patch_attachments_acl()
    def test_edit_attachments(self):
        """middleware removes and adds attachments to post"""
        attachments = [
            self.mock_attachment(post=self.post),
            self.mock_attachment(post=self.post),
            self.mock_attachment(),
        ]

        user_acl = useracl.get_user_acl(self.user, cache_versions)
        middleware = AttachmentsMiddleware(
            request=Mock(data={"attachments": [attachments[0].pk, attachments[2].pk]}),
            mode=PostingEndpoint.EDIT,
            user=self.user,
            user_acl=user_acl,
            post=self.post,
        )

        serializer = middleware.get_serializer()
        self.assertTrue(serializer.is_valid())
        middleware.save(serializer)

        # attachments were associated with post
        self.assertEqual(self.post.update_fields, ["attachments_cache"])
        self.assertEqual(self.post.attachment_set.count(), 2)

        attachments_filenames = [attachments[2].filename, attachments[0].filename]
        self.assertEqual(
            [a["filename"] for a in self.post.attachments_cache], attachments_filenames
        )


class ValidateAttachmentsCountTests(AuthenticatedUserTestCase):
    def test_validate_attachments_count(self):
        """too large count of attachments is rejected"""
        validate_attachments_count(range(settings.MISAGO_POST_ATTACHMENTS_LIMIT))

        with self.assertRaises(serializers.ValidationError):
            validate_attachments_count(
                range(settings.MISAGO_POST_ATTACHMENTS_LIMIT + 1)
            )