<?php
/**
 * Tests for sync engine import orchestration.
 *
 * @package WPContentSync
 */

namespace WPContentSync\Tests\Unit\Sync;

use PHPUnit\Framework\TestCase;
use WPContentSync\Content\ContentHandlerInterface;
use WPContentSync\Content\ContentHandlerRegistry;
use WPContentSync\Content\ContentImportException;
use WPContentSync\Logging\LoggerInterface;
use WPContentSync\Package\ContentPackage;
use WPContentSync\Settings\SettingsRepository;
use WPContentSync\Sync\SyncContext;
use WPContentSync\Sync\SyncEngine;
use WPContentSync\Sync\SyncResult;
use WPContentSync\Sync\SyncStateRepository;

class SyncEngineTest extends TestCase {
	/** @var \ArrayObject<int, array<string, mixed>> */
	private \ArrayObject $call_recorder;

	/** @var \ArrayObject<int, array<string, mixed>> */
	private \ArrayObject $log_recorder;

	protected function setUp(): void {
		$this->call_recorder = new \ArrayObject();
		$this->log_recorder  = new \ArrayObject();

		parent::setUp();
	}

	protected function tearDown(): void {
		unset(
			$GLOBALS['wpcs_test_options'],
			$GLOBALS['wpcs_test_option_autoloads'],
			$GLOBALS['wpcs_test_transients'],
			$GLOBALS['wpcs_test_transient_expiration']
		);

		parent::tearDown();
	}

	public function test_it_calls_handlers_in_registry_order_and_merges_results(): void {
		$engine = $this->engine(
			array(
				$this->handler( 'media', SyncResult::success( array( 'created' => 1 ) ) ),
				$this->handler( 'posts', SyncResult::success( array( 'updated' => 2 ) ) ),
				$this->handler(
					'terms',
					SyncResult::success(
						array(
							'skipped'   => 1,
							'conflicts' => 1,
						)
					)
				),
			)
		);

		$result = $engine->importPackage( $this->package() );

		self::assertTrue( $result->isSuccessful() );
		self::assertSame( 1, $result->created() );
		self::assertSame( 2, $result->updated() );
		self::assertSame( 1, $result->skipped() );
		self::assertSame( 1, $result->conflicts() );
		$calls = $this->call_recorder->getArrayCopy();

		self::assertSame( array( 'terms', 'posts', 'media' ), array_column( $calls, 'bucket' ) );
		self::assertSame( array( array( 'id' => 20 ) ), $calls[0]['records'] );
		self::assertSame( array( array( 'id' => 10 ) ), $calls[1]['records'] );
		self::assertSame( array( array( 'id' => 30 ) ), $calls[2]['records'] );
		self::assertSame( 'manual_review', $calls[0]['context']->conflictStrategy() );
	}

	public function test_it_saves_running_and_completed_state(): void {
		$engine = $this->engine(
			array(
				$this->handler( 'posts', SyncResult::success( array( 'created' => 1 ) ) ),
				$this->handler( 'media', SyncResult::success( array( 'created' => 1 ) ) ),
			)
		);

		$engine->importPackage( $this->package() );

		$states = array_values( $GLOBALS['wpcs_test_transients'] );

		self::assertCount( 1, $GLOBALS['wpcs_test_transients'] );
		self::assertSame( 'completed', $states[0]['status'] );
		self::assertSame( 2, $states[0]['processed'] );
		self::assertSame( 3, $states[0]['total'] );
	}

	public function test_it_logs_operation_start_and_completion(): void {
		$engine = $this->engine(
			array(
				$this->handler( 'posts', SyncResult::success( array( 'created' => 1 ) ) ),
			)
		);

		$engine->importPackage( $this->package() );

		$logs = $this->log_recorder->getArrayCopy();

		self::assertSame( 'Starting content package import.', $logs[0]['message'] );
		self::assertSame( 'Completed content package import.', $logs[1]['message'] );
		self::assertSame( 1, $logs[1]['context']['created'] );
	}

	public function test_it_returns_failure_when_handler_throws_import_exception(): void {
		$engine = $this->engine(
			array(
				$this->throwingHandler( 'posts' ),
				$this->handler( 'media', SyncResult::success( array( 'created' => 1 ) ) ),
			)
		);

		$result = $engine->importPackage( $this->package() );
		$states = array_values( $GLOBALS['wpcs_test_transients'] );
		$logs   = $this->log_recorder->getArrayCopy();

		self::assertFalse( $result->isSuccessful() );
		self::assertSame( array( 'Posts failed.' ), $result->errors() );
		self::assertSame( 'failed', $states[0]['status'] );
		self::assertSame( 'Content package import failed.', $logs[1]['message'] );
		self::assertSame( 'posts', $logs[1]['context']['bucket'] );
	}

	/**
	 * @param array<int, ContentHandlerInterface> $handlers Handlers.
	 */
	private function engine( array $handlers ): SyncEngine {
		update_option(
			SettingsRepository::OPTION_NAME,
			array(
				'conflict_strategy' => 'manual_review',
			),
			false
		);

		return new SyncEngine(
			new ContentHandlerRegistry( $handlers ),
			new SyncStateRepository(),
			new SettingsRepository(),
			$this->logger()
		);
	}

	private function package(): ContentPackage {
		return ContentPackage::fromArray(
			array(
				'source'      => array(
					'site_url' => 'https://source.test',
				),
				'destination' => array(
					'site_url' => 'https://destination.test',
				),
				'manifest'    => array(
					'posts' => 1,
					'terms' => 1,
					'media' => 1,
				),
				'records'     => array(
					'posts' => array(
						array( 'id' => 10 ),
					),
					'terms' => array(
						array( 'id' => 20 ),
					),
					'media' => array(
						array( 'id' => 30 ),
					),
				),
			)
		);
	}

	private function handler( string $bucket, SyncResult $result ): ContentHandlerInterface {
		return new class( $bucket, $result, $this->call_recorder ) implements ContentHandlerInterface {
			private string $bucket;
			private SyncResult $result;

			/** @var \ArrayObject<int, array<string, mixed>> */
			private \ArrayObject $recorder;

			/**
			 * @param \ArrayObject<int, array<string, mixed>> $recorder Call recorder.
			 */
			public function __construct( string $bucket, SyncResult $result, \ArrayObject $recorder ) {
				$this->bucket   = $bucket;
				$this->result   = $result;
				$this->recorder = $recorder;
			}

			public function bucket(): string {
				return $this->bucket;
			}

			public function importRecords( array $records, SyncContext $context ): SyncResult {
				$this->recorder->append(
					array(
						'bucket'  => $this->bucket,
						'records' => $records,
						'context' => $context,
					)
				);

				return $this->result;
			}
		};
	}

	private function throwingHandler( string $bucket ): ContentHandlerInterface {
		return new class( $bucket, $this->call_recorder ) implements ContentHandlerInterface {
			private string $bucket;

			/** @var \ArrayObject<int, array<string, mixed>> */
			private \ArrayObject $recorder;

			/**
			 * @param \ArrayObject<int, array<string, mixed>> $recorder Call recorder.
			 */
			public function __construct( string $bucket, \ArrayObject $recorder ) {
				$this->bucket   = $bucket;
				$this->recorder = $recorder;
			}

			public function bucket(): string {
				return $this->bucket;
			}

			public function importRecords( array $records, SyncContext $context ): SyncResult {
				$this->recorder->append(
					array(
						'bucket'  => $this->bucket,
						'records' => $records,
						'context' => $context,
					)
				);

				throw new ContentImportException( $this->bucket, array( 'id' => 10 ), 'Posts failed.' );
			}
		};
	}

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

			/**
			 * @param \ArrayObject<int, array<string, mixed>> $recorder Log recorder.
			 */
			public function __construct( \ArrayObject $recorder ) {
				$this->recorder = $recorder;
			}

			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->recorder->append(
					array(
						'level'   => $level,
						'message' => $message,
						'context' => $context,
					)
				);
			}
		};
	}
}