<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-only
 */

namespace OCA\Encryption\Tests;

use OC\Files\View;
use OCA\Encryption\Crypto\Crypt;
use OCA\Encryption\KeyManager;
use OCA\Encryption\Recovery;
use OCP\Config\IUserConfig;
use OCP\Encryption\IFile;
use OCP\IAppConfig;
use OCP\IUser;
use OCP\IUserSession;
use PHPUnit\Framework\MockObject\MockObject;
use Test\TestCase;

class RecoveryTest extends TestCase {
	private static $tempStorage = [];

	private IFile&MockObject $fileMock;
	private View&MockObject $viewMock;
	private IUserSession&MockObject $userSessionMock;
	private IUser&MockObject $user;
	private KeyManager&MockObject $keyManagerMock;
	private IAppConfig&MockObject $appConfigMock;
	private IUserConfig&MockObject $userConfigMock;
	private Crypt&MockObject $cryptMock;

	private Recovery $instance;

	public function testEnableAdminRecoverySuccessful(): void {
		$this->keyManagerMock->expects($this->exactly(2))
			->method('recoveryKeyExists')
			->willReturnOnConsecutiveCalls(false, true);

		$this->cryptMock->expects($this->once())
			->method('createKeyPair')
			->willReturn([
				'publicKey' => 'privateKey',
				'privateKey' => 'publicKey',
			]);

		$this->keyManagerMock->expects($this->once())
			->method('setRecoveryKey')
			->willReturn(false);

		$this->keyManagerMock->expects($this->exactly(2))
			->method('checkRecoveryPassword')
			->willReturnOnConsecutiveCalls(true, true);

		$this->assertTrue($this->instance->enableAdminRecovery('password'));
		$this->assertArrayHasKey('recoveryAdminEnabled', self::$tempStorage);
		$this->assertTrue(self::$tempStorage['recoveryAdminEnabled']);

		$this->assertTrue($this->instance->enableAdminRecovery('password'));
	}

	public function testEnableAdminRecoveryCouldNotCheckPassword(): void {
		$this->keyManagerMock->expects($this->exactly(2))
			->method('recoveryKeyExists')
			->willReturnOnConsecutiveCalls(false, true);

		$this->cryptMock->expects($this->once())
			->method('createKeyPair')
			->willReturn([
				'publicKey' => 'privateKey',
				'privateKey' => 'publicKey',
			]);

		$this->keyManagerMock->expects($this->once())
			->method('setRecoveryKey')
			->willReturn(false);

		$this->keyManagerMock->expects($this->exactly(2))
			->method('checkRecoveryPassword')
			->willReturnOnConsecutiveCalls(true, false);

		$this->assertTrue($this->instance->enableAdminRecovery('password'));
		$this->assertArrayHasKey('recoveryAdminEnabled', self::$tempStorage);
		$this->assertTrue(self::$tempStorage['recoveryAdminEnabled']);

		$this->assertFalse($this->instance->enableAdminRecovery('password'));
	}

	public function testEnableAdminRecoveryCouldNotCreateKey(): void {
		$this->keyManagerMock->expects($this->once())
			->method('recoveryKeyExists')
			->willReturn(false);

		$this->cryptMock->expects($this->once())
			->method('createKeyPair')
			->willReturn(false);

		$this->assertFalse($this->instance->enableAdminRecovery('password'));
	}

	public function testChangeRecoveryKeyPasswordSuccessful(): void {
		$this->assertFalse($this->instance->changeRecoveryKeyPassword('password', 'passwordOld'));

		$this->keyManagerMock->expects($this->once())
			->method('getSystemPrivateKey')
			->willReturn('privateKey');

		$this->cryptMock->expects($this->once())
			->method('decryptPrivateKey')
			->with('privateKey', 'passwordOld')
			->willReturn('decryptedPrivateKey');

		$this->cryptMock->expects($this->once())
			->method('encryptPrivateKey')
			->with('decryptedPrivateKey', 'password')
			->willReturn('privateKey');

		$this->assertTrue($this->instance->changeRecoveryKeyPassword('password', 'passwordOld'));
	}

	public function testChangeRecoveryKeyPasswordCouldNotDecryptPrivateRecoveryKey(): void {
		$this->assertFalse($this->instance->changeRecoveryKeyPassword('password', 'passwordOld'));

		$this->keyManagerMock->expects($this->once())
			->method('getSystemPrivateKey');

		$this->cryptMock->expects($this->once())
			->method('decryptPrivateKey')
			->willReturn(false);

		$this->assertFalse($this->instance->changeRecoveryKeyPassword('password', 'passwordOld'));
	}

	public function testDisableAdminRecovery(): void {
		$this->keyManagerMock->expects($this->exactly(2))
			->method('checkRecoveryPassword')
			->willReturnOnConsecutiveCalls(true, false);

		$this->assertArrayHasKey('recoveryAdminEnabled', self::$tempStorage);
		$this->assertTrue($this->instance->disableAdminRecovery('password'));
		$this->assertFalse(self::$tempStorage['recoveryAdminEnabled']);

		$this->assertFalse($this->instance->disableAdminRecovery('password'));
	}

	public function testIsRecoveryEnabledForUser(): void {
		$this->userConfigMock->expects($this->exactly(2))
			->method('getValueBool')
			->willReturnOnConsecutiveCalls(true, false);

		$this->assertTrue($this->instance->isRecoveryEnabledForUser());
		$this->assertFalse($this->instance->isRecoveryEnabledForUser('admin'));
	}

	public function testIsRecoveryKeyEnabled(): void {
		$this->assertFalse($this->instance->isRecoveryKeyEnabled());
		self::$tempStorage['recoveryAdminEnabled'] = true;
		$this->assertTrue($this->instance->isRecoveryKeyEnabled());
	}

	public function testSetRecoveryFolderForUser(): void {
		$this->viewMock->expects($this->exactly(2))
			->method('getDirectoryContent')
			->willReturn([]);
		$this->assertTrue($this->instance->setRecoveryForUser(false));
		$this->assertTrue($this->instance->setRecoveryForUser(true));
	}

	public function testRecoverUserFiles(): void {
		$this->viewMock->expects($this->once())
			->method('getDirectoryContent')
			->willReturn([]);

		$this->cryptMock->expects($this->once())
			->method('decryptPrivateKey')
			->willReturn('privateKey');
		$this->instance->recoverUsersFiles('password', 'admin');
		$this->addToAssertionCount(1);
	}

	public function testRecoverFile(): void {
		$this->keyManagerMock->expects($this->once())
			->method('getEncryptedFileKey')
			->willReturn(true);

		$this->keyManagerMock->expects($this->once())
			->method('getShareKey')
			->willReturn(true);

		$this->cryptMock->expects($this->once())
			->method('multiKeyDecryptLegacy')
			->willReturn('multiKeyDecryptLegacyResult');

		$this->fileMock->expects($this->once())
			->method('getAccessList')
			->willReturn(['users' => ['admin']]);

		$this->keyManagerMock->expects($this->once())
			->method('getPublicKey')
			->willReturn('publicKey');

		$this->keyManagerMock->expects($this->once())
			->method('addSystemKeys')
			->with($this->anything(), $this->anything(), $this->equalTo('admin'))
			->willReturn(['admin' => 'publicKey']);

		$this->cryptMock->expects($this->once())
			->method('multiKeyEncrypt')
			->willReturn(['admin' => 'shareKey']);

		$this->keyManagerMock->expects($this->once())
			->method('deleteLegacyFileKey');
		$this->keyManagerMock->expects($this->once())
			->method('setShareKey');

		$this->assertNull(self::invokePrivate($this->instance,
			'recoverFile',
			['/', 'testkey', 'admin']));
	}

	protected function setUp(): void {
		parent::setUp();

		$this->user = $this->createMock(IUser::class);
		$this->user->expects($this->any())
			->method('getUID')
			->willReturn('admin');

		$this->userSessionMock = $this->createMock(IUserSession::class);
		$this->userSessionMock->expects($this->any())
			->method('getUser')
			->willReturn($this->user);
		$this->userSessionMock->expects($this->any())
			->method('isLoggedIn')
			->willReturn(true);

		$this->cryptMock = $this->getMockBuilder(Crypt::class)->disableOriginalConstructor()->getMock();
		$this->keyManagerMock = $this->getMockBuilder(KeyManager::class)->disableOriginalConstructor()->getMock();
		$this->appConfigMock = $this->createMock(IAppConfig::class);
		$this->userConfigMock = $this->createMock(IUserConfig::class);
		$this->fileMock = $this->createMock(IFile::class);
		$this->viewMock = $this->createMock(View::class);

		$this->appConfigMock->expects($this->any())
			->method('setValueBool')
			->willReturnCallback(function (string $app, string $key, bool $value): bool {
				self::$tempStorage[$key] = $value;
				return true;
			});

		$this->appConfigMock->expects($this->any())
			->method('getValueBool')
			->willReturnCallback(function (string $app, string $key, bool $default = false): bool {
				return self::$tempStorage[$key] ?? $default;
			});

		$this->instance = new Recovery($this->userSessionMock,
			$this->cryptMock,
			$this->keyManagerMock,
			$this->appConfigMock,
			$this->userConfigMock,
			$this->fileMock,
			$this->viewMock);
	}

}