<?php
/**
 * Imports post content records.
 *
 * @package WPContentSync
 */

namespace WPContentSync\Content;

use WPContentSync\Logging\LoggerInterface;
use WPContentSync\Sync\SyncContext;
use WPContentSync\Sync\SyncResult;
use WPContentSync\Url\MetadataUrlTransformer;
use WPContentSync\Url\UrlMapping;
use WPContentSync\Url\UrlMappingCollection;
use WPContentSync\Url\UrlTransformer;

final class PostContentHandler implements ContentHandlerInterface {
	private ContentRecordNormalizer $normalizer;
	private UrlTransformer $url_transformer;
	private MetadataUrlTransformer $metadata_transformer;
	private LoggerInterface $logger;

	public function __construct(
		ContentRecordNormalizer $normalizer,
		UrlTransformer $url_transformer,
		MetadataUrlTransformer $metadata_transformer,
		LoggerInterface $logger
	) {
		$this->normalizer           = $normalizer;
		$this->url_transformer      = $url_transformer;
		$this->metadata_transformer = $metadata_transformer;
		$this->logger               = $logger;
	}

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

	/**
	 * @param array<int, array<string, mixed>> $records Package records.
	 */
	public function importRecords( array $records, SyncContext $context ): SyncResult {
		$created   = 0;
		$updated   = 0;
		$skipped   = 0;
		$conflicts = 0;
		$mappings  = $this->mappings( $context );
		$errors    = array();

		foreach ( $records as $record ) {
			$normalized = $this->normalizer->post( $record );
			$existing   = $this->findExistingPostId( (int) $normalized['id'] );

			if ( $existing > 0 && 'manual_review' === $context->conflictStrategy() ) {
				++$skipped;
				++$conflicts;
				$this->logger->warning(
					'Skipped post import because manual review is required.',
					array(
						'source_id' => $normalized['id'],
						'post_id'   => $existing,
					)
				);
				continue;
			}

			try {
				$post_id = $this->savePost( $normalized, $existing, $mappings );
			} catch ( ContentImportException $exception ) {
				$errors[] = $exception->getMessage();
				$this->logger->error(
					$exception->getMessage(),
					array(
						'bucket' => $exception->bucket(),
						'record' => $exception->record(),
					)
				);
				continue;
			}

			if ( $existing > 0 ) {
				++$updated;
			} else {
				++$created;
			}

			$this->saveMeta( $post_id, $normalized, $context, $mappings );
		}

		if ( array() !== $errors ) {
			return SyncResult::merge(
				array(
					SyncResult::success(
						array(
							'created'   => $created,
							'updated'   => $updated,
							'skipped'   => $skipped,
							'conflicts' => $conflicts,
						)
					),
					SyncResult::failure( $errors ),
				)
			);
		}

		$this->logger->info(
			'Imported post content records.',
			array(
				'created'   => $created,
				'updated'   => $updated,
				'skipped'   => $skipped,
				'conflicts' => $conflicts,
			)
		);

		return SyncResult::success(
			array(
				'created'   => $created,
				'updated'   => $updated,
				'skipped'   => $skipped,
				'conflicts' => $conflicts,
			)
		);
	}

	private function findExistingPostId( int $source_id ): int {
		if ( $source_id <= 0 ) {
			return 0;
		}

		$posts = get_posts(
			array(
				'post_type'  => 'any',
				// phpcs:disable WordPress.DB.SlowDBQuery.slow_db_query_meta_key, WordPress.DB.SlowDBQuery.slow_db_query_meta_value -- Source ID lookup is the handler's stable import identity.
				'meta_key'   => '_wpcs_source_id',
				'meta_value' => (string) $source_id,
				// phpcs:enable WordPress.DB.SlowDBQuery.slow_db_query_meta_key, WordPress.DB.SlowDBQuery.slow_db_query_meta_value
			)
		);

		if ( array() === $posts ) {
			return 0;
		}

		return (int) $posts[0]->ID;
	}

	/**
	 * @param array<string, mixed> $record   Normalized post record.
	 * @param int                  $existing Existing post ID.
	 */
	private function savePost( array $record, int $existing, UrlMappingCollection $mappings ): int {
		$post_data = array(
			'post_type'    => $record['post_type'],
			'post_title'   => $record['post_title'],
			'post_content' => $this->url_transformer->transformString( (string) $record['post_content'], $mappings ),
			'post_excerpt' => $this->url_transformer->transformString( (string) $record['post_excerpt'], $mappings ),
			'post_status'  => $record['post_status'],
			'post_name'    => $record['post_name'],
			'post_parent'  => $record['post_parent'],
			'menu_order'   => $record['menu_order'],
		);

		if ( $existing > 0 ) {
			$post_data['ID'] = $existing;

			return $this->postIdFromResult( wp_update_post( $post_data, true ), $record );
		}

		return $this->postIdFromResult( wp_insert_post( $post_data, true ), $record );
	}

	/**
	 * @param int|\WP_Error        $result Post save result.
	 * @param array<string, mixed> $record Normalized post record.
	 */
	private function postIdFromResult( $result, array $record ): int {
		if ( is_wp_error( $result ) || (int) $result <= 0 ) {
			throw new ContentImportException(
				$this->bucket(),
				$record,
				sprintf( 'Post import failed for source ID %d.', (int) $record['id'] )
			);
		}

		return (int) $result;
	}

	/**
	 * @param array<string, mixed> $record Normalized post record.
	 */
	private function saveMeta( int $post_id, array $record, SyncContext $context, UrlMappingCollection $mappings ): void {
		update_post_meta( $post_id, '_wpcs_source_id', (int) $record['id'] );
		update_post_meta( $post_id, '_wpcs_source_site', $context->sourceUrl() );

		foreach ( $record['meta'] as $key => $value ) {
			update_post_meta(
				$post_id,
				(string) $key,
				$this->metadata_transformer->transformValue( $value, $mappings )
			);
		}
	}

	private function mappings( SyncContext $context ): UrlMappingCollection {
		$mappings = array();

		foreach ( $context->urlMappings() as $source => $destination ) {
			$mappings[] = new UrlMapping( $source, $destination );
		}

		return new UrlMappingCollection( $mappings );
	}
}