# Copyright (C) 2024–present  Loren Eteval & contributors <loren.eteval@proton.me>
#
# This file is part of Furious.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

"""Verify subscription workflow ownership outside table widgets."""

from types import SimpleNamespace
from unittest import TestCase, mock

import os

os.environ.setdefault('QT_QPA_PLATFORM', 'offscreen')

from PySide6 import QtCore

from Furious.Service.SubscriptionManager import SubscriptionManager
from tests.support import application


class _Payload:
    """Expose the minimal QNetworkReply byte-array contract."""

    def __init__(self, value):
        self._value = value

    def data(self):
        return self._value


class _Reply:
    """Provide deterministic response data and failure diagnostics."""

    def __init__(self, value=b'', error='request failed'):
        self._value = value
        self._error = error

    def readAll(self):
        return _Payload(self._value)

    def errorString(self):
        return self._error


class _AbortableReply:
    """Record cancellation of one exact service-owned network reply."""

    def __init__(self):
        self.aborted = False

    def abort(self):
        self.aborted = True


class SubscriptionManagerTest(TestCase):
    """Protect decoding, failure, and stable-ID scheduling boundaries."""

    @classmethod
    def setUpClass(cls):
        cls.application = application()

    @staticmethod
    def _manager(subscriptions=None):
        subscriptions = subscriptions if subscriptions is not None else {}

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.UserSubs',
            return_value=subscriptions,
        ):
            return SubscriptionManager()

    def testSuccessfulAndInvalidPayloadsProduceSemanticBatchInputs(self):
        manager = self._manager()
        profile = SimpleNamespace(itemRemark='profile')
        imported = SimpleNamespace(
            decoderId='decoder',
            profiles=(profile,),
            rejectedItems=2,
        )
        manager.importer = SimpleNamespace(
            importPayload=mock.Mock(return_value=imported)
        )
        successful = []
        failed = []

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.SubscriptionGroup',
            return_value=None,
        ):
            manager.successCallback(
                _Reply(b'payload'),
                unique='group-a',
                remark='Group A',
                webURL='https://invalid.test/subscription',
                successArgs=successful,
                failureArgs=failed,
            )

        self.assertEqual(len(successful), 1)
        self.assertEqual(successful[0]['profiles'], (profile,))
        self.assertEqual(successful[0]['decoderId'], 'decoder')
        self.assertEqual(failed, [])

        manager.importer = SimpleNamespace(importPayload=mock.Mock(return_value=None))

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.SubscriptionGroup',
            return_value=None,
        ):
            manager.successCallback(
                _Reply(b'invalid'),
                unique='group-a',
                successArgs=successful,
                failureArgs=failed,
            )

        self.assertEqual(failed[-1]['error'], 'UnsupportedSubscriptionFormat')
        manager.deleteLater()

    def testRequestFailureIsDataForPresentationNotAWidgetSideEffect(self):
        manager = self._manager()
        failed = []

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.SubscriptionGroup',
            return_value=None,
        ):
            manager.failureCallback(
                _Reply(error='offline'),
                unique='group-a',
                remark='Group A',
                webURL='https://invalid.test/subscription',
                failureArgs=failed,
            )

        self.assertEqual(failed[-1]['error'], 'offline')
        self.assertFalse(hasattr(manager, 'table'))
        manager.deleteLater()

    def testStaleRequestCompletionCannotMutateCurrentSubscription(self):
        subscriptions = {
            'group-a': {
                'webURL': 'https://invalid.test/current',
                'enabled': True,
            }
        }
        manager = self._manager(subscriptions)
        manager._requestVersions['group-a'] = 2
        manager.importer = SimpleNamespace(importPayload=mock.Mock())

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.UserSubs',
            return_value=subscriptions,
        ):
            manager.successCallback(
                _Reply(b'stale'),
                unique='group-a',
                webURL='https://invalid.test/current',
                requestVersion=1,
                successArgs=[],
                failureArgs=[],
            )

        manager.importer.importPayload.assert_not_called()
        manager.deleteLater()

    def testStaleBatchEntriesAreNotReconciledOrReported(self):
        subscriptions = {
            'group-a': {
                'webURL': 'https://invalid.test/current',
                'enabled': True,
            }
        }
        manager = self._manager(subscriptions)
        manager._requestVersions['group-a'] = 2
        manager._synchronizeProfiles = mock.Mock()
        completed = []
        manager.updateCompleted.connect(completed.append)
        stale = {
            'unique': 'group-a',
            'webURL': 'https://invalid.test/current',
            'requestVersion': 1,
            'profiles': (),
        }

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.UserSubs',
            return_value=subscriptions,
        ):
            manager.handleSynchronizationResults(
                successArgs=[stale],
                failureArgs=[{'error': 'offline', **stale}],
            )

        manager._synchronizeProfiles.assert_not_called()
        self.assertEqual(completed, [])
        manager.deleteLater()

    def testCancellationInvalidatesAndAbortsOnlyTheSelectedSubscription(self):
        manager = self._manager()
        groupAReply = _AbortableReply()
        groupBReply = _AbortableReply()
        manager._requestVersions.update({'group-a': 1, 'group-b': 4})
        manager._activeReplies.update(
            {id(groupAReply): groupAReply, id(groupBReply): groupBReply}
        )
        manager._replySubscriptions.update(
            {id(groupAReply): 'group-a', id(groupBReply): 'group-b'}
        )

        manager.cancelUpdates('group-a')

        self.assertTrue(groupAReply.aborted)
        self.assertFalse(groupBReply.aborted)
        self.assertEqual(manager._requestVersions, {'group-a': 2, 'group-b': 4})
        manager._activeReplies.clear()
        manager._replySubscriptions.clear()
        manager.deleteLater()

    def testAutoUpdateTimersAreReusedAndKeyedByStableSubscriptionId(self):
        subscriptions = {
            'group-a': {
                'remark': 'Group A',
                'webURL': 'https://invalid.test/a',
                'autoupdate': 'Every 5 mins',
                'proxy': '',
                'enabled': True,
            },
        }
        manager = self._manager(subscriptions)
        timer = manager._autoUpdateTimers['group-a']

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.UserSubs',
            return_value=subscriptions,
        ):
            manager.refreshAutoUpdates()
            manager.refreshAutoUpdates()

        self.assertIs(manager._autoUpdateTimers['group-a'], timer)
        self.assertEqual(timer.property('subscriptionId'), 'group-a')
        self.assertEqual(len(manager._autoUpdateTimers), 1)

        subscriptions.clear()

        with mock.patch(
            'Furious.Service.SubscriptionManager.Storage.UserSubs',
            return_value=subscriptions,
        ):
            manager.refreshAutoUpdates()

        self.assertEqual(manager._autoUpdateTimers, {})
        self.assertFalse(timer.isActive())
        manager.deleteLater()