<?php
/**
 * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace Test\Files\Cache;

use OC;
use OC\Files\Cache\Cache;
use OC\Files\Cache\CacheEntry;
use OC\Files\Cache\Scanner;
use OC\Files\Storage\Storage;
use OC\Files\Storage\Temporary;
use OCP\Files\Cache\IScanner;
use Test\TestCase;

/**
 * Class ScannerTest
 *
 * @group DB
 *
 * @package Test\Files\Cache
 */
class ScannerTest extends TestCase {
	private Storage $storage;
	private Scanner $scanner;
	private Cache $cache;

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

		$this->storage = new Temporary([]);
		$this->scanner = new Scanner($this->storage);
		$this->cache = new Cache($this->storage);
	}

	protected function tearDown(): void {
		$this->cache->clear();

		parent::tearDown();
	}

	public function testFile(): void {
		$data = "dummy file data\n";
		$this->storage->file_put_contents('foo.txt', $data);
		$this->scanner->scanFile('foo.txt');

		$this->assertEquals($this->cache->inCache('foo.txt'), true);
		$cachedData = $this->cache->get('foo.txt');
		$this->assertEquals($cachedData['size'], strlen($data));
		$this->assertEquals($cachedData['mimetype'], 'text/plain');
		$this->assertNotEquals($cachedData['parent'], -1); //parent folders should be scanned automatically

		$data = file_get_contents(OC::$SERVERROOT . '/core/img/logo/logo.png');
		$this->storage->file_put_contents('foo.png', $data);
		$this->scanner->scanFile('foo.png');

		$this->assertEquals($this->cache->inCache('foo.png'), true);
		$cachedData = $this->cache->get('foo.png');
		$this->assertEquals($cachedData['size'], strlen($data));
		$this->assertEquals($cachedData['mimetype'], 'image/png');
	}

	public function testFile4Byte(): void {
		$data = "dummy file data\n";
		$this->storage->file_put_contents('foo🙈.txt', $data);

		if (OC::$server->getDatabaseConnection()->supports4ByteText()) {
			$this->assertNotNull($this->scanner->scanFile('foo🙈.txt'));
			$this->assertTrue($this->cache->inCache('foo🙈.txt'), true);

			$cachedData = $this->cache->get('foo🙈.txt');
			$this->assertEquals(strlen($data), $cachedData['size']);
			$this->assertEquals('text/plain', $cachedData['mimetype']);
			$this->assertNotEquals(-1, $cachedData['parent']); //parent folders should be scanned automatically
		} else {
			$this->assertNull($this->scanner->scanFile('foo🙈.txt'));
			$this->assertFalse($this->cache->inCache('foo🙈.txt'), true);
		}
	}

	public function testFileInvalidChars(): void {
		$data = "dummy file data\n";
		$this->storage->file_put_contents("foo\nbar.txt", $data);

		$this->assertNull($this->scanner->scanFile("foo\nbar.txt"));
		$this->assertFalse($this->cache->inCache("foo\nbar.txt"), true);
	}

	private function fillTestFolders() {
		$textData = "dummy file data\n";
		$imgData = file_get_contents(OC::$SERVERROOT . '/core/img/logo/logo.png');
		$this->storage->mkdir('folder');
		$this->storage->file_put_contents('foo.txt', $textData);
		$this->storage->file_put_contents('foo.png', $imgData);
		$this->storage->file_put_contents('folder/bar.txt', $textData);
	}

	public function testFolder(): void {
		$this->fillTestFolders();

		$this->scanner->scan('');
		$this->assertEquals($this->cache->inCache(''), true);
		$this->assertEquals($this->cache->inCache('foo.txt'), true);
		$this->assertEquals($this->cache->inCache('foo.png'), true);
		$this->assertEquals($this->cache->inCache('folder'), true);
		$this->assertEquals($this->cache->inCache('folder/bar.txt'), true);

		$cachedDataText = $this->cache->get('foo.txt');
		$cachedDataText2 = $this->cache->get('foo.txt');
		$cachedDataImage = $this->cache->get('foo.png');
		$cachedDataFolder = $this->cache->get('');
		$cachedDataFolder2 = $this->cache->get('folder');

		$this->assertEquals($cachedDataImage['parent'], $cachedDataText['parent']);
		$this->assertEquals($cachedDataFolder['fileid'], $cachedDataImage['parent']);
		$this->assertEquals($cachedDataFolder['size'], $cachedDataImage['size'] + $cachedDataText['size'] + $cachedDataText2['size']);
		$this->assertEquals($cachedDataFolder2['size'], $cachedDataText2['size']);
	}

	public function testShallow(): void {
		$this->fillTestFolders();

		$this->scanner->scan('', IScanner::SCAN_SHALLOW);
		$this->assertEquals($this->cache->inCache(''), true);
		$this->assertEquals($this->cache->inCache('foo.txt'), true);
		$this->assertEquals($this->cache->inCache('foo.png'), true);
		$this->assertEquals($this->cache->inCache('folder'), true);
		$this->assertEquals($this->cache->inCache('folder/bar.txt'), false);

		$cachedDataFolder = $this->cache->get('');
		$cachedDataFolder2 = $this->cache->get('folder');

		$this->assertEquals(-1, $cachedDataFolder['size']);
		$this->assertEquals(-1, $cachedDataFolder2['size']);

		$this->scanner->scan('folder', IScanner::SCAN_SHALLOW);

		$cachedDataFolder2 = $this->cache->get('folder');

		$this->assertNotEquals($cachedDataFolder2['size'], -1);

		$this->cache->correctFolderSize('folder');

		$cachedDataFolder = $this->cache->get('');
		$this->assertNotEquals($cachedDataFolder['size'], -1);
	}

	public function testBackgroundScan(): void {
		$this->fillTestFolders();
		$this->storage->mkdir('folder2');
		$this->storage->file_put_contents('folder2/bar.txt', 'foobar');

		$this->scanner->scan('', IScanner::SCAN_SHALLOW);
		$this->assertFalse($this->cache->inCache('folder/bar.txt'));
		$this->assertFalse($this->cache->inCache('folder/2bar.txt'));
		$cachedData = $this->cache->get('');
		$this->assertEquals(-1, $cachedData['size']);

		$this->scanner->backgroundScan();

		$this->assertTrue($this->cache->inCache('folder/bar.txt'));
		$this->assertTrue($this->cache->inCache('folder/bar.txt'));

		$cachedData = $this->cache->get('');
		$this->assertnotEquals(-1, $cachedData['size']);

		$this->assertFalse($this->cache->getIncomplete());
	}

	public function testBackgroundScanOnlyRecurseIncomplete(): void {
		$this->fillTestFolders();
		$this->storage->mkdir('folder2');
		$this->storage->file_put_contents('folder2/bar.txt', 'foobar');

		$this->scanner->scan('', IScanner::SCAN_SHALLOW);
		$this->assertFalse($this->cache->inCache('folder/bar.txt'));
		$this->assertFalse($this->cache->inCache('folder/2bar.txt'));
		$this->assertFalse($this->cache->inCache('folder2/bar.txt'));
		$this->cache->put('folder2', ['size' => 1]); // mark as complete

		$cachedData = $this->cache->get('');
		$this->assertEquals(-1, $cachedData['size']);

		$this->scanner->scan('', IScanner::SCAN_RECURSIVE_INCOMPLETE, IScanner::REUSE_ETAG | IScanner::REUSE_SIZE);

		$this->assertTrue($this->cache->inCache('folder/bar.txt'));
		$this->assertTrue($this->cache->inCache('folder/bar.txt'));
		$this->assertFalse($this->cache->inCache('folder2/bar.txt'));

		$cachedData = $this->cache->get('');
		$this->assertNotEquals(-1, $cachedData['size']);

		$this->assertFalse($this->cache->getIncomplete());
	}

	public function testBackgroundScanNestedIncompleteFolders(): void {
		$this->storage->mkdir('folder');
		$this->scanner->backgroundScan();

		$this->storage->mkdir('folder/subfolder1');
		$this->storage->mkdir('folder/subfolder2');

		$this->storage->mkdir('folder/subfolder1/subfolder3');
		$this->cache->put('folder', ['size' => -1]);
		$this->cache->put('folder/subfolder1', ['size' => -1]);

		// do a scan to get the folders into the cache.
		$this->scanner->backgroundScan();

		$this->assertTrue($this->cache->inCache('folder/subfolder1/subfolder3'));

		$this->storage->file_put_contents('folder/subfolder1/bar1.txt', 'foobar');
		$this->storage->file_put_contents('folder/subfolder1/subfolder3/bar3.txt', 'foobar');
		$this->storage->file_put_contents('folder/subfolder2/bar2.txt', 'foobar');

		//mark folders as incomplete.
		$this->cache->put('folder/subfolder1', ['size' => -1]);
		$this->cache->put('folder/subfolder2', ['size' => -1]);
		$this->cache->put('folder/subfolder1/subfolder3', ['size' => -1]);

		$this->scanner->backgroundScan();

		$this->assertTrue($this->cache->inCache('folder/subfolder1/bar1.txt'));
		$this->assertTrue($this->cache->inCache('folder/subfolder2/bar2.txt'));
		$this->assertTrue($this->cache->inCache('folder/subfolder1/subfolder3/bar3.txt'));

		//check if folder sizes are correct.
		$this->assertEquals(18, $this->cache->get('folder')['size']);
		$this->assertEquals(12, $this->cache->get('folder/subfolder1')['size']);
		$this->assertEquals(6, $this->cache->get('folder/subfolder1/subfolder3')['size']);
		$this->assertEquals(6, $this->cache->get('folder/subfolder2')['size']);
	}

	public function testReuseExisting(): void {
		$this->fillTestFolders();

		$this->scanner->scan('');
		$oldData = $this->cache->get('');
		$this->storage->unlink('folder/bar.txt');
		$this->cache->put('folder', ['mtime' => $this->storage->filemtime('folder'), 'storage_mtime' => $this->storage->filemtime('folder')]);
		$this->scanner->scan('', IScanner::SCAN_SHALLOW, IScanner::REUSE_SIZE);
		$newData = $this->cache->get('');
		$this->assertIsString($oldData['etag']);
		$this->assertIsString($newData['etag']);
		$this->assertNotSame($oldData['etag'], $newData['etag']);
		$this->assertEquals($oldData['size'], $newData['size']);

		$oldData = $newData;
		$this->scanner->scan('', IScanner::SCAN_SHALLOW, IScanner::REUSE_ETAG);
		$newData = $this->cache->get('');
		$this->assertSame($oldData['etag'], $newData['etag']);
		$this->assertEquals(-1, $newData['size']);

		$this->scanner->scan('', IScanner::SCAN_RECURSIVE);
		$oldData = $this->cache->get('');
		$this->assertNotEquals(-1, $oldData['size']);
		$this->scanner->scanFile('', IScanner::REUSE_ETAG + IScanner::REUSE_SIZE);
		$newData = $this->cache->get('');
		$this->assertSame($oldData['etag'], $newData['etag']);
		$this->assertEquals($oldData['size'], $newData['size']);

		$this->scanner->scan('', IScanner::SCAN_RECURSIVE, IScanner::REUSE_ETAG + IScanner::REUSE_SIZE);
		$newData = $this->cache->get('');
		$this->assertSame($oldData['etag'], $newData['etag']);
		$this->assertEquals($oldData['size'], $newData['size']);

		$this->scanner->scan('', IScanner::SCAN_SHALLOW, IScanner::REUSE_ETAG + IScanner::REUSE_SIZE);
		$newData = $this->cache->get('');
		$this->assertSame($oldData['etag'], $newData['etag']);
		$this->assertEquals($oldData['size'], $newData['size']);
	}

	public function testRemovedFile(): void {
		$this->fillTestFolders();

		$this->scanner->scan('');
		$this->assertTrue($this->cache->inCache('foo.txt'));
		$this->storage->unlink('foo.txt');
		$this->scanner->scan('', IScanner::SCAN_SHALLOW);
		$this->assertFalse($this->cache->inCache('foo.txt'));
	}

	public function testRemovedFolder(): void {
		$this->fillTestFolders();

		$this->scanner->scan('');
		$this->assertTrue($this->cache->inCache('folder/bar.txt'));
		$this->storage->rmdir('/folder');
		$this->scanner->scan('', IScanner::SCAN_SHALLOW);
		$this->assertFalse($this->cache->inCache('folder'));
		$this->assertFalse($this->cache->inCache('folder/bar.txt'));
	}

	public function testScanRemovedFile(): void {
		$this->fillTestFolders();

		$this->scanner->scan('');
		$this->assertTrue($this->cache->inCache('folder/bar.txt'));
		$this->storage->unlink('folder/bar.txt');
		$this->scanner->scanFile('folder/bar.txt');
		$this->assertFalse($this->cache->inCache('folder/bar.txt'));
	}

	public function testETagRecreation(): void {
		$this->fillTestFolders();

		$this->scanner->scan('folder/bar.txt');

		// manipulate etag to simulate an empty etag
		$this->scanner->scan('', IScanner::SCAN_SHALLOW, IScanner::REUSE_ETAG);
		/** @var CacheEntry $data0 */
		$data0 = $this->cache->get('folder/bar.txt');
		$this->assertIsString($data0['etag']);
		$data1 = $this->cache->get('folder');
		$this->assertIsString($data1['etag']);
		$data2 = $this->cache->get('');
		$this->assertIsString($data2['etag']);
		$data0['etag'] = '';
		$this->cache->put('folder/bar.txt', $data0->getData());

		// rescan
		$this->scanner->scan('folder/bar.txt', IScanner::SCAN_SHALLOW, IScanner::REUSE_ETAG);

		// verify cache content
		$newData0 = $this->cache->get('folder/bar.txt');
		$this->assertIsString($newData0['etag']);
		$this->assertNotEmpty($newData0['etag']);
	}

	public function testRepairParent(): void {
		$this->fillTestFolders();
		$this->scanner->scan('');
		$this->assertTrue($this->cache->inCache('folder/bar.txt'));
		$oldFolderId = $this->cache->getId('folder');

		// delete the folder without removing the children
		$query = OC::$server->getDatabaseConnection()->getQueryBuilder();
		$query->delete('filecache')
			->where($query->expr()->eq('fileid', $query->createNamedParameter($oldFolderId)));
		$query->execute();

		$cachedData = $this->cache->get('folder/bar.txt');
		$this->assertEquals($oldFolderId, $cachedData['parent']);
		$this->assertFalse($this->cache->inCache('folder'));

		$this->scanner->scan('');

		$this->assertTrue($this->cache->inCache('folder'));
		$newFolderId = $this->cache->getId('folder');
		$this->assertNotEquals($oldFolderId, $newFolderId);

		$cachedData = $this->cache->get('folder/bar.txt');
		$this->assertEquals($newFolderId, $cachedData['parent']);
	}

	public function testRepairParentShallow(): void {
		$this->fillTestFolders();
		$this->scanner->scan('');
		$this->assertTrue($this->cache->inCache('folder/bar.txt'));
		$oldFolderId = $this->cache->getId('folder');

		// delete the folder without removing the children
		$query = OC::$server->getDatabaseConnection()->getQueryBuilder();
		$query->delete('filecache')
			->where($query->expr()->eq('fileid', $query->createNamedParameter($oldFolderId)));
		$query->execute();

		$cachedData = $this->cache->get('folder/bar.txt');
		$this->assertEquals($oldFolderId, $cachedData['parent']);
		$this->assertFalse($this->cache->inCache('folder'));

		$this->scanner->scan('folder', IScanner::SCAN_SHALLOW);

		$this->assertTrue($this->cache->inCache('folder'));
		$newFolderId = $this->cache->getId('folder');
		$this->assertNotEquals($oldFolderId, $newFolderId);

		$cachedData = $this->cache->get('folder/bar.txt');
		$this->assertEquals($newFolderId, $cachedData['parent']);
	}

	/**
	 * @dataProvider dataTestIsPartialFile
	 *
	 * @param string $path
	 * @param bool $expected
	 */
	public function testIsPartialFile($path, $expected): void {
		$this->assertSame($expected,
			$this->scanner->isPartialFile($path)
		);
	}

	public function dataTestIsPartialFile() {
		return [
			['foo.txt.part', true],
			['/sub/folder/foo.txt.part', true],
			['/sub/folder.part/foo.txt', true],
			['foo.txt', false],
			['/sub/folder/foo.txt', false],
		];
	}

	public function testNoETagUnscannedFolder(): void {
		$this->fillTestFolders();

		$this->scanner->scan('');

		$oldFolderEntry = $this->cache->get('folder');
		// create a new file in a folder by keeping the mtime unchanged, but mark the folder as unscanned
		$this->storage->file_put_contents('folder/new.txt', 'foo');
		$this->storage->touch('folder', $oldFolderEntry->getMTime());
		$this->cache->update($oldFolderEntry->getId(), ['size' => -1]);

		$this->scanner->scan('');

		$this->cache->inCache('folder/new.txt');

		$newFolderEntry = $this->cache->get('folder');
		$this->assertNotEquals($newFolderEntry->getEtag(), $oldFolderEntry->getEtag());
	}

	public function testNoETagUnscannedSubFolder(): void {
		$this->fillTestFolders();
		$this->storage->mkdir('folder/sub');

		$this->scanner->scan('');

		$oldFolderEntry1 = $this->cache->get('folder');
		$oldFolderEntry2 = $this->cache->get('folder/sub');
		// create a new file in a folder by keeping the mtime unchanged, but mark the folder as unscanned
		$this->storage->file_put_contents('folder/sub/new.txt', 'foo');
		$this->storage->touch('folder/sub', $oldFolderEntry1->getMTime());

		// we only mark the direct parent as unscanned, which is the current "notify" behavior
		$this->cache->update($oldFolderEntry2->getId(), ['size' => -1]);

		$this->scanner->scan('');

		$this->cache->inCache('folder/new.txt');

		$newFolderEntry1 = $this->cache->get('folder');
		$this->assertNotEquals($newFolderEntry1->getEtag(), $oldFolderEntry1->getEtag());
		$newFolderEntry2 = $this->cache->get('folder/sub');
		$this->assertNotEquals($newFolderEntry2->getEtag(), $oldFolderEntry2->getEtag());
	}
}