<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Media;

use Brain\Monkey\Actions;
use Brain\Monkey\Filters;
use Brain\Monkey\Functions;
use LIT\MCP\Abilities\WriteFailed;
use LIT\MCP\Integrations\Media\MediaImporter;
use LIT\MCP\Limits;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use WP_Error;

final class MediaImporterTest extends TestCase
{
    /** Key shapes as in WordPress core's wp_get_mime_types(). */
    private const CORE_MIMES = [
        'jpg|jpeg|jpe' => 'image/jpeg',
        'gif' => 'image/gif',
        'png' => 'image/png',
        'webp' => 'image/webp',
        'avif' => 'image/avif',
        'htm|html' => 'text/html',
        'mp3|m4a|m4b' => 'audio/mpeg',
        'mp4|m4v' => 'video/mp4',
        'pdf' => 'application/pdf',
    ];

    /** @var list<string> */
    private array $tempFiles = [];

    protected function setUp(): void
    {
        parent::setUp();
        Functions\when('get_option')->justReturn(['upload_mb' => 1]);
        Functions\when('wp_tempnam')->alias(function (): string {
            $file = (string) tempnam(sys_get_temp_dir(), 'lit-up');
            $this->tempFiles[] = $file;
            return $file;
        });
        Functions\when('wp_delete_file')->alias(static function (string $file): void {
            if (is_file($file)) {
                unlink($file);
            }
        });
        Functions\when('sanitize_file_name')->returnArg();
        Functions\when('wp_basename')->alias('basename');
        Functions\when('wp_parse_url')->alias('parse_url');
        Functions\when('get_allowed_mime_types')->justReturn(self::CORE_MIMES);
        Functions\when('wp_check_filetype')->alias(static function (string $filename, array $mimes): array {
            foreach ($mimes as $extensions => $mime) {
                if (preg_match('!\.(' . $extensions . ')$!i', $filename, $match)) {
                    return ['ext' => $match[1], 'type' => $mime];
                }
            }

            return ['ext' => false, 'type' => false];
        });
    }

    protected function tearDown(): void
    {
        foreach ($this->tempFiles as $file) {
            if (is_file($file)) {
                unlink($file);
            }
        }
        parent::tearDown();
    }

    private function importer(): MediaImporter
    {
        return new MediaImporter(new Limits());
    }

    private function assertTempFilesRemoved(): void
    {
        foreach ($this->tempFiles as $file) {
            self::assertFileDoesNotExist($file);
        }
    }

    /** Lets the next wp_safe_remote_get write $body into the stream target and answer with $headers. */
    private function respond(string $body, int $code = 200, array $headers = []): void
    {
        Functions\when('wp_safe_remote_get')->alias(static function (string $url, array $args) use ($body, $code, $headers): array {
            file_put_contents($args['filename'], $body);
            return ['response' => ['code' => $code], 'headers' => $headers, 'filename' => $args['filename']];
        });
        $this->responseReaders();
    }

    private function responseReaders(): void
    {
        Functions\when('wp_http_validate_url')->returnArg();
        Functions\when('wp_remote_retrieve_response_code')->alias(static fn (array $r): int => $r['response']['code']);
        Functions\when('wp_remote_retrieve_header')->alias(
            static fn (array $r, string $name): string => (string) ($r['headers'][$name] ?? '')
        );
    }

    public function testBase64UploadIsSideloadedWithAltText(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        Functions\expect('media_handle_sideload')->once()
            ->with(Mockery::on(static fn (array $file): bool => $file['name'] === 'logo.png' && is_file($file['tmp_name'])), 5, 'Logo')
            ->andReturnUsing(static function (array $file): int {
                unlink($file['tmp_name']); // WordPress moves the temp file into uploads.
                return 55;
            });
        Functions\expect('update_post_meta')->once()->with(55, '_wp_attachment_image_alt', 'Firmenlogo')->andReturn(true);

        $id = $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', [
            'title' => 'Logo',
            'alt' => 'Firmenlogo',
            'post_id' => 5,
        ]);

        self::assertSame(55, $id);
    }

    public function testOversizedBase64IsRejectedBeforeDecoding(): void
    {
        $result = $this->importer()->fromBase64(str_repeat('A', 2 * 1024 * 1024), 'big.png', []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertStringContainsString('Limit 1 MB', $result->get_error_message());
        self::assertSame([], $this->tempFiles, 'no temp file may be written for an oversized upload');
    }

    public function testInvalidBase64IsRejected(): void
    {
        $result = $this->importer()->fromBase64('***', 'x.png', []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertSame([], $this->tempFiles);
    }

    public function testDisguisedFileIsRejectedAndTheTempFileRemoved(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => false, 'type' => false, 'proper_filename' => false]);
        Functions\expect('media_handle_sideload')->never();

        $result = $this->importer()->fromBase64(base64_encode('<?php evil();'), 'bild.png', []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertNotSame([], $this->tempFiles);
        $this->assertTempFilesRemoved();
    }

    public function testTheWhitelistOnlyKeepsTypesWordPressAllowsTheUser(): void
    {
        Functions\when('get_allowed_mime_types')->justReturn(['png' => 'image/png', 'svg' => 'image/svg+xml']);
        Functions\expect('wp_check_filetype_and_ext')->once()
            ->with(Mockery::type('string'), 'logo.png', ['png' => 'image/png'])
            ->andReturn(['ext' => false, 'type' => false, 'proper_filename' => false]);

        $result = $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertStringContainsString('png', $result->get_error_message());
    }

    public function testSideloadFailureIsAWriteFailureAndCleansUp(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        Functions\when('media_handle_sideload')->justReturn(new WP_Error('upload_error', 'Verzeichnis nicht beschreibbar'));

        $result = $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', []);

        self::assertSame('lit_write_failed', $result->get_error_code());
        self::assertStringContainsString('Verzeichnis nicht beschreibbar', $result->get_error_message());
        $this->assertTempFilesRemoved();
    }

    public function testFailedAltTextDeletesTheNewAttachmentAgain(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        Functions\when('media_handle_sideload')->justReturn(55);
        Functions\when('update_post_meta')->justReturn(false);
        Functions\when('get_post_meta')->justReturn('');
        Functions\expect('wp_delete_attachment')->once()->with(55, true)->andReturn(new \stdClass());

        try {
            $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', ['alt' => 'Logo']);
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertTrue($e->rolledBack);
            self::assertSame('lit_write_failed', $e->toError()->get_error_code());
        }
        $this->assertTempFilesRemoved();
    }

    public function testAltTextFailureWithoutRollbackIsAPartialWriteNamingTheAttachment(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        Functions\when('media_handle_sideload')->justReturn(55);
        Functions\when('update_post_meta')->justReturn(false);
        Functions\when('get_post_meta')->justReturn('');
        Functions\when('wp_delete_attachment')->justReturn(false);

        try {
            $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', ['alt' => 'Logo']);
            self::fail('WriteFailed expected');
        } catch (WriteFailed $e) {
            self::assertFalse($e->rolledBack);
            self::assertSame(55, $e->postId);
            $error = $e->toError();
            self::assertSame('lit_partial_write', $error->get_error_code());
            self::assertStringContainsString('Medium 55', $error->get_error_message());
            self::assertSame(55, $error->get_error_data()['attachment_id']);
        }
    }

    public function testAnAltTextAlreadyTakenFromTheImageIsNoFailure(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        Functions\when('media_handle_sideload')->justReturn(55);
        Functions\when('update_post_meta')->justReturn(false); // Same value already stored (IPTC alt).
        Functions\when('get_post_meta')->justReturn('Logo');
        Functions\expect('wp_delete_attachment')->never();

        self::assertSame(55, $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', ['alt' => 'Logo']));
    }

    public function testInternalUrlsAreRejectedWithoutRequest(): void
    {
        Functions\when('wp_http_validate_url')->justReturn(false);
        Functions\expect('wp_safe_remote_get')->never();

        $result = $this->importer()->fromUrl('http://127.0.0.1/wp-config.php', null, []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
    }

    public function testOnlyHttpUrlsAreFetched(): void
    {
        Functions\when('wp_http_validate_url')->returnArg();
        Functions\expect('wp_safe_remote_get')->never();

        $result = $this->importer()->fromUrl('ftp://example.com/logo.png', null, []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
    }

    public function testUrlImportDownloadsSafelyWithTheSizeLimit(): void
    {
        $this->responseReaders();
        Functions\expect('wp_safe_remote_get')->once()->with(
            'https://example.com/bilder/logo.png',
            Mockery::on(static function (array $args): bool {
                file_put_contents($args['filename'], 'PNGDATA');
                return $args['stream'] === true && $args['limit_response_size'] === 1024 * 1024 + 1;
            })
        )->andReturn(['response' => ['code' => 200], 'headers' => []]);
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        Functions\expect('media_handle_sideload')->once()
            ->with(Mockery::on(static fn (array $file): bool => $file['name'] === 'logo.png'), 0, null)
            ->andReturn(56);

        self::assertSame(56, $this->importer()->fromUrl('https://example.com/bilder/logo.png', null, []));
        $this->assertTempFilesRemoved();
    }

    public function testAMissingExtensionIsTakenFromTheContentType(): void
    {
        $this->respond('PNGDATA', 200, ['content-type' => 'image/png; charset=binary']);
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        Functions\expect('media_handle_sideload')->once()
            ->with(Mockery::on(static fn (array $file): bool => $file['name'] === 'foto.png'), 0, null)
            ->andReturn(57);

        self::assertSame(57, $this->importer()->fromUrl('https://cdn.example.com/foto?w=800', null, []));
    }

    public function testFailedDownloadIsReportedAndCleansUp(): void
    {
        Functions\when('wp_http_validate_url')->returnArg();
        Functions\when('wp_safe_remote_get')->justReturn(new WP_Error('http_request_failed', 'Not Found'));

        $result = $this->importer()->fromUrl('https://example.com/fehlt.jpg', null, []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertStringContainsString('Not Found', $result->get_error_message());
        $this->assertTempFilesRemoved();
    }

    public function testHttpErrorStatusIsReported(): void
    {
        $this->respond('<html>404</html>', 404);
        Functions\expect('media_handle_sideload')->never();

        $result = $this->importer()->fromUrl('https://example.com/fehlt.jpg', null, []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertStringContainsString('404', $result->get_error_message());
        $this->assertTempFilesRemoved();
    }

    public function testOversizedContentLengthIsRejected(): void
    {
        $this->respond('x', 200, ['content-length' => (string) (5 * 1024 * 1024)]);
        Functions\expect('media_handle_sideload')->never();

        $result = $this->importer()->fromUrl('https://example.com/gross.jpg', null, []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertStringContainsString('Limit 1 MB', $result->get_error_message());
        $this->assertTempFilesRemoved();
    }

    public function testDownloadCutOffAtTheLimitIsRejected(): void
    {
        $this->respond(str_repeat('x', 1024 * 1024 + 1));
        Functions\expect('media_handle_sideload')->never();

        $result = $this->importer()->fromUrl('https://example.com/gross.jpg', null, []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        self::assertStringContainsString('Limit 1 MB', $result->get_error_message());
        $this->assertTempFilesRemoved();
    }

    public function testTheWhitelistIsMatchedPerExtensionAgainstCoreKeys(): void
    {
        Functions\expect('wp_check_filetype_and_ext')->once()
            ->with(Mockery::type('string'), 'song.mp3', Mockery::on(static function (array $mimes): bool {
                return ($mimes['mp3'] ?? null) === 'audio/mpeg'
                    && ($mimes['jpeg'] ?? null) === 'image/jpeg'
                    && ($mimes['m4v'] ?? null) === 'video/mp4'
                    && ! isset($mimes['m4a'], $mimes['html'], $mimes['htm']);
            }))
            ->andReturn(['ext' => 'mp3', 'type' => 'audio/mpeg', 'proper_filename' => false]);
        Functions\when('media_handle_sideload')->justReturn(60);

        self::assertSame(60, $this->importer()->fromBase64(base64_encode('ID3DATA'), 'song.mp3', []));
    }

    public function testAnEmptyWhitelistRejectsEverythingInsteadOfFallingBackToAllTypes(): void
    {
        Functions\when('get_allowed_mime_types')->justReturn(['htm|html' => 'text/html']);
        Functions\expect('wp_check_filetype_and_ext')->never();
        Functions\expect('media_handle_sideload')->never();

        $result = $this->importer()->fromBase64(base64_encode('<html></html>'), 'seite.html', []);

        self::assertSame('lit_validation_failed', $result->get_error_code());
        $this->assertTempFilesRemoved();
    }

    public function testTheMovedFileIsRemovedWhenTheAttachmentCannotBeCreated(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        $record = null;
        Filters\expectAdded('wp_handle_upload')->once()->whenHappen(static function (callable $callback) use (&$record): void {
            $record = $callback;
        });
        $moved = (string) tempnam(sys_get_temp_dir(), 'lit-moved');
        $this->tempFiles[] = $moved;
        Functions\when('media_handle_sideload')->alias(static function () use (&$record, $moved): WP_Error {
            $record(['file' => $moved, 'url' => 'https://kunde.de/x.png', 'type' => 'image/png'], 'sideload');
            return new WP_Error('db_insert_error', 'Datenbankfehler');
        });

        $result = $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', []);

        self::assertSame('lit_write_failed', $result->get_error_code());
        self::assertFileDoesNotExist($moved);
        self::assertFalse(has_filter('wp_handle_upload'));
    }

    public function testTheSavedFileIsKeptOnSuccess(): void
    {
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => 'png', 'type' => 'image/png', 'proper_filename' => false]);
        $record = null;
        Filters\expectAdded('wp_handle_upload')->once()->whenHappen(static function (callable $callback) use (&$record): void {
            $record = $callback;
        });
        $moved = (string) tempnam(sys_get_temp_dir(), 'lit-moved');
        $this->tempFiles[] = $moved;
        Functions\when('media_handle_sideload')->alias(static function () use (&$record, $moved): int {
            $record(['file' => $moved], 'sideload');
            return 61;
        });

        self::assertSame(61, $this->importer()->fromBase64(base64_encode('PNGDATA'), 'logo.png', []));
        self::assertFileExists($moved);
    }

    public function testCurlIsRestrictedToIpv4ForTheImportRequestOnly(): void
    {
        $this->respond('PNGDATA', 200);
        Actions\expectAdded('http_api_curl')->once()->whenHappen(static function (callable $callback): void {
            if (function_exists('curl_init')) {
                $callback(curl_init()); // Must accept a real cURL handle without error.
            }
        });
        Functions\when('wp_check_filetype_and_ext')->justReturn(['ext' => false, 'type' => false, 'proper_filename' => false]);

        $this->importer()->fromUrl('https://example.com/logo.png', null, []);

        self::assertFalse(has_action('http_api_curl'));
    }

    public function testAMissingTempFileNameIsAWriteFailure(): void
    {
        Functions\when('wp_http_validate_url')->returnArg();
        Functions\when('wp_tempnam')->justReturn('');
        Functions\expect('wp_safe_remote_get')->never();

        $result = $this->importer()->fromUrl('https://example.com/logo.png', null, []);

        self::assertSame('lit_write_failed', $result->get_error_code());
    }
}