<?php

namespace WPContentSync\Tests\Unit\Admin;

use PHPUnit\Framework\TestCase;
use WPContentSync\Admin\FileImportController;
use WPContentSync\Content\ContentHandlerInterface;
use WPContentSync\Content\ContentHandlerRegistry;
use WPContentSync\Logging\LoggerInterface;
use WPContentSync\Package\PackageChecksum;
use WPContentSync\Package\PackageValidator;
use WPContentSync\Settings\SettingsRepository;
use WPContentSync\Sync\SyncContext;
use WPContentSync\Sync\SyncEngine;
use WPContentSync\Sync\SyncResult;
use WPContentSync\Sync\SyncStateRepository;
use WPContentSync\Transport\JsonFileTransport;

class FileImportControllerTest extends TestCase {
	/** @var array<int, string> */
	private array $temporary_files = array();

	/** @var array<int, array<string, mixed>> */
	private array $logs = array();

	protected function tearDown(): void {
		foreach ( $this->temporary_files as $file ) {
			if ( is_file( $file ) ) {
				// phpcs:ignore WordPress.WP.AlternativeFunctions.unlink_unlink -- Removing a PHPUnit temp file.
				unlink( $file );
			}
		}

		unset(
			$GLOBALS['wpcs_current_user_can'],
			$GLOBALS['wpcs_nonce_valid'],
			$GLOBALS['wpcs_redirect_location'],
			$GLOBALS['wpcs_test_options'],
			$GLOBALS['wpcs_test_option_autoloads'],
			$GLOBALS['wpcs_test_transients'],
			$GLOBALS['wpcs_test_transient_expiration']
		);
		$_FILES     = array();
		$this->logs = array();

		parent::tearDown();
	}

	public function test_it_rejects_users_without_manage_options(): void {
		$GLOBALS['wpcs_current_user_can']['manage_options'] = false;
		$controller = $this->controller();

		$this->expectException( \RuntimeException::class );
		$this->expectExceptionMessage( 'You do not have permission to import content packages.' );

		$controller->handleImport();
	}

	public function test_it_rejects_invalid_nonces(): void {
		$GLOBALS['wpcs_nonce_valid']['wpcs_import_package']['wpcs_import_package_nonce'] = false;
		$controller = $this->controller();

		$this->expectException( \RuntimeException::class );
		$this->expectExceptionMessage( 'The import request could not be verified.' );

		$controller->handleImport();
	}

	public function test_it_rejects_missing_uploads(): void {
		$controller = $this->controller();

		$this->expectException( \RuntimeException::class );
		$this->expectExceptionMessage( 'Choose a package JSON file before importing.' );

		$controller->handleImport();
	}

	public function test_it_rejects_failed_uploads(): void {
		$_FILES['wpcs_package_file'] = array(
			'tmp_name' => '',
			'error'    => UPLOAD_ERR_INI_SIZE,
		);
		$controller                  = $this->controller();

		$this->expectException( \RuntimeException::class );
		$this->expectExceptionMessage( 'The package file could not be uploaded.' );

		$controller->handleImport();
	}

	public function test_it_imports_valid_uploaded_packages_with_sync_engine(): void {
		$file = $this->createTemporaryPackageFile( $this->validJson() );

		$_FILES['wpcs_package_file'] = array(
			'tmp_name' => $file,
			'error'    => UPLOAD_ERR_OK,
		);

		$this->controller()->handleImport();

		self::assertStringContainsString( 'wpcs_imported=1', $GLOBALS['wpcs_redirect_location'] );
		self::assertSame( 'Imported content package.', $this->logs[2]['message'] );
		self::assertSame( 0, $this->logs[2]['context']['created'] );
	}

	public function test_it_redirects_with_error_when_sync_engine_import_fails(): void {
		$file = $this->createTemporaryPackageFile( $this->validJson() );

		$_FILES['wpcs_package_file'] = array(
			'tmp_name' => $file,
			'error'    => UPLOAD_ERR_OK,
		);

		$this->controller( SyncResult::failure( array( 'Posts failed.' ) ) )->handleImport();

		self::assertStringContainsString( 'wpcs_import_error=', $GLOBALS['wpcs_redirect_location'] );
		self::assertStringContainsString( 'Posts+failed.', $GLOBALS['wpcs_redirect_location'] );
	}

	public function test_it_redirects_with_error_for_invalid_uploaded_packages(): void {
		$file = $this->createTemporaryPackageFile( '{"schema_version":' );

		$_FILES['wpcs_package_file'] = array(
			'tmp_name' => $file,
			'error'    => UPLOAD_ERR_OK,
		);

		$this->controller()->handleImport();

		self::assertStringContainsString( 'wpcs_import_error=', $GLOBALS['wpcs_redirect_location'] );
		self::assertStringContainsString( 'not+valid+JSON', $GLOBALS['wpcs_redirect_location'] );
	}

	private function controller( ?SyncResult $result = null ): FileImportController {
		$logger = $this->logger();

		return new FileImportController(
			new JsonFileTransport( new PackageValidator() ),
			$logger,
			$this->syncEngine( $result ?? SyncResult::success() )
		);
	}

	private function syncEngine( SyncResult $result ): SyncEngine {
		return new SyncEngine(
			new ContentHandlerRegistry( array( $this->handler( $result ) ) ),
			new SyncStateRepository(),
			new SettingsRepository(),
			$this->logger()
		);
	}

	private function handler( SyncResult $result ): ContentHandlerInterface {
		return new class( $result ) implements ContentHandlerInterface {
			private SyncResult $result;

			public function __construct( SyncResult $result ) {
				$this->result = $result;
			}

			public function bucket(): string {
				return 'posts';
			}

			public function importRecords( array $records, SyncContext $context ): SyncResult {
				return $this->result;
			}
		};
	}

	private function logger(): LoggerInterface {
		return new class( $this->logs ) implements LoggerInterface {
			/** @var array<int, array<string, mixed>> */
			private array $logs;

			/**
			 * @param array<int, array<string, mixed>> $logs Logs.
			 */
			public function __construct( array &$logs ) {
				$this->logs = &$logs;
			}

			public function error( string $message, array $context = array() ): void {
				$this->record( 'error', $message, $context );
			}

			public function warning( string $message, array $context = array() ): void {
				$this->record( 'warning', $message, $context );
			}

			public function info( string $message, array $context = array() ): void {
				$this->record( 'info', $message, $context );
			}

			public function debug( string $message, array $context = array() ): void {
				$this->record( 'debug', $message, $context );
			}

			/**
			 * @param array<string, mixed> $context Context.
			 */
			private function record( string $level, string $message, array $context ): void {
				$this->logs[] = array(
					'level'   => $level,
					'message' => $message,
					'context' => $context,
				);
			}
		};
	}

	private function validJson(): string {
		$records = array(
			'posts'             => array(),
			'terms'             => array(),
			'media'             => array(),
			'custom_post_types' => array(),
		);

		$json = wp_json_encode(
			array(
				'schema_version' => '1.0',
				'generated_at'   => '2026-04-26T20:30:00+00:00',
				'source'         => array(
					'site_url' => 'https://example.test',
					'name'     => 'Example',
				),
				'destination'    => array(
					'site_url' => 'https://staging.example.test',
					'name'     => 'Staging',
				),
				'manifest'       => array(
					'posts'             => 0,
					'terms'             => 0,
					'media'             => 0,
					'custom_post_types' => 0,
				),
				'records'        => $records,
				'checksums'      => array(
					'records' => PackageChecksum::records( $records ),
				),
			)
		);

		if ( false === $json ) {
			throw new \RuntimeException( 'Unable to create package JSON fixture.' );
		}

		return $json;
	}

	private function createTemporaryPackageFile( string $contents ): string {
		$file = tempnam( sys_get_temp_dir(), 'wpcs-package-' );

		if ( false === $file ) {
			throw new \RuntimeException( 'Unable to create temporary package file.' );
		}

		// phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_operations_file_put_contents -- Creating a PHPUnit temp fixture.
		file_put_contents( $file, $contents );
		$this->temporary_files[] = $file;

		return $file;
	}
}