<?php

declare(strict_types=1);

namespace Magdev\WcLicensedProductClient\Tests\Security;

use Magdev\WcLicensedProductClient\Security\IntegrityChecker;
use Magdev\WcLicensedProductClient\Security\IntegrityException;
use PHPUnit\Framework\Attributes\CoversClass;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;

#[CoversClass(IntegrityChecker::class)]
#[CoversClass(IntegrityException::class)]
final class IntegrityCheckerTest extends TestCase
{
    private string $tempDir;

    protected function setUp(): void
    {
        $this->tempDir = sys_get_temp_dir() . '/integrity_test_' . uniqid();
        mkdir($this->tempDir, 0755, true);
    }

    protected function tearDown(): void
    {
        $this->removeDirectory($this->tempDir);
    }

    #[Test]
    public function itPassesForUnmodifiedFiles(): void
    {
        $this->createFile('test.php', '<?php echo "hello";');

        $checker = new IntegrityChecker([], $this->tempDir);
        $hashes = $checker->generateHashes(['test.php']);

        $verifier = new IntegrityChecker($hashes, $this->tempDir);
        $verifier->verify();

        self::assertTrue($verifier->isValid());
    }

    #[Test]
    public function itFailsForModifiedFiles(): void
    {
        $this->createFile('test.php', '<?php echo "hello";');

        $checker = new IntegrityChecker([], $this->tempDir);
        $hashes = $checker->generateHashes(['test.php']);

        // Modify the file
        $this->createFile('test.php', '<?php echo "world";');

        $verifier = new IntegrityChecker($hashes, $this->tempDir);

        $this->expectException(IntegrityException::class);
        $this->expectExceptionMessage('Modified file: test.php');

        $verifier->verify();
    }

    #[Test]
    public function itFailsForMissingFiles(): void
    {
        $this->createFile('test.php', '<?php echo "hello";');

        $checker = new IntegrityChecker([], $this->tempDir);
        $hashes = $checker->generateHashes(['test.php']);

        // Delete the file
        unlink($this->tempDir . '/test.php');

        $verifier = new IntegrityChecker($hashes, $this->tempDir);

        $this->expectException(IntegrityException::class);
        $this->expectExceptionMessage('Missing file: test.php');

        $verifier->verify();
    }

    #[Test]
    public function itReturnsFailureDetailsInException(): void
    {
        $this->createFile('file1.php', 'content1');
        $this->createFile('file2.php', 'content2');

        $checker = new IntegrityChecker([], $this->tempDir);
        $hashes = $checker->generateHashes(['file1.php', 'file2.php']);

        // Modify both files
        $this->createFile('file1.php', 'modified1');
        $this->createFile('file2.php', 'modified2');

        $verifier = new IntegrityChecker($hashes, $this->tempDir);

        try {
            $verifier->verify();
            self::fail('Expected IntegrityException');
        } catch (IntegrityException $e) {
            self::assertCount(2, $e->failures);
            self::assertContains('Modified file: file1.php', $e->failures);
            self::assertContains('Modified file: file2.php', $e->failures);
        }
    }

    #[Test]
    public function itIsValidReturnsFalseForModifiedFiles(): void
    {
        $this->createFile('test.php', 'original');

        $checker = new IntegrityChecker([], $this->tempDir);
        $hashes = $checker->generateHashes(['test.php']);

        $this->createFile('test.php', 'modified');

        $verifier = new IntegrityChecker($hashes, $this->tempDir);

        self::assertFalse($verifier->isValid());
    }

    #[Test]
    public function itGeneratesConsistentHashes(): void
    {
        $this->createFile('test.php', '<?php echo "hello";');

        $checker1 = new IntegrityChecker([], $this->tempDir);
        $checker2 = new IntegrityChecker([], $this->tempDir);

        $hash1 = $checker1->generateHashes(['test.php']);
        $hash2 = $checker2->generateHashes(['test.php']);

        self::assertSame($hash1, $hash2);
    }

    #[Test]
    public function itNormalizesLineEndings(): void
    {
        // Create file with Unix line endings
        $this->createFile('test.php', "line1\nline2\n");

        $checker = new IntegrityChecker([], $this->tempDir);
        $hash1 = $checker->generateHashes(['test.php']);

        // Create same file with Windows line endings
        $this->createFile('test.php', "line1\r\nline2\r\n");

        $hash2 = $checker->generateHashes(['test.php']);

        self::assertSame($hash1['test.php'], $hash2['test.php']);
    }

    #[Test]
    public function itGeneratesPhpCode(): void
    {
        $this->createFile('test.php', 'content');

        $checker = new IntegrityChecker([], $this->tempDir);
        $code = $checker->generateHashesAsPhpCode(['test.php']);

        self::assertStringContainsString('[', $code);
        self::assertStringContainsString(']', $code);
        self::assertStringContainsString("'test.php'", $code);
    }

    #[Test]
    public function itThrowsForNonExistentFileInGenerate(): void
    {
        $checker = new IntegrityChecker([], $this->tempDir);

        $this->expectException(\InvalidArgumentException::class);

        $checker->generateHashes(['nonexistent.php']);
    }

    #[Test]
    public function itHandlesSubdirectories(): void
    {
        mkdir($this->tempDir . '/subdir', 0755, true);
        $this->createFile('subdir/test.php', 'content');

        $checker = new IntegrityChecker([], $this->tempDir);
        $hashes = $checker->generateHashes(['subdir/test.php']);

        self::assertArrayHasKey('subdir/test.php', $hashes);

        $verifier = new IntegrityChecker($hashes, $this->tempDir);
        self::assertTrue($verifier->isValid());
    }

    private function createFile(string $relativePath, string $content): void
    {
        $fullPath = $this->tempDir . '/' . $relativePath;
        $dir = dirname($fullPath);

        if (!is_dir($dir)) {
            mkdir($dir, 0755, true);
        }

        file_put_contents($fullPath, $content);
    }

    private function removeDirectory(string $dir): void
    {
        if (!is_dir($dir)) {
            return;
        }

        $files = array_diff(scandir($dir), ['.', '..']);

        foreach ($files as $file) {
            $path = $dir . '/' . $file;
            is_dir($path) ? $this->removeDirectory($path) : unlink($path);
        }

        rmdir($dir);
    }
}