<?php
/**
 * TMDO_Entity_Migration_Engine - 遷移引擎
 *
 * 負責將原生 wp_*meta 表中的 EAV 資料搬移至 UAE 扁平化表
 *
 * 特性：
 * - Cursor-based 分頁（避免 OFFSET 效能問題）
 * - 斷點續傳（記錄 last_id）
 * - 批次處理（可配置 batch size）
 * - Transaction 安全
 * - 統計報告
 *
 * @package WP_Data_Optimizer
 */

declare(strict_types=1);

// phpcs:disable Squiz.Commenting,Generic.Commenting,WordPress.DB.PreparedSQL.NotPrepared,WordPress.DB.PreparedSQL.InterpolatedNotPrepared,WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber,Generic.CodeAnalysis.UnusedFunctionParameter,Generic.CodeAnalysis.EmptyStatement,Squiz.PHP.DisallowMultipleAssignments,Squiz.PHP.DisallowSizeFunctionsInLoops,WordPress.WP.I18n.MissingTranslatorsComment,WordPress.PHP.NoSilencedErrors,WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents,Squiz.PHP.CommentedOutCode,Universal.NamingConventions.NoReservedKeywordParameterNames,WordPress.PHP.YodaConditions,Squiz.Commenting.InlineComment.InvalidEndChar -- PR-1 ported from UAE; cleanup PR scheduled.


defined( 'ABSPATH' ) || exit;

final class TMDO_Entity_Migration_Engine {

	/** 預設批次大小 */
	public const DEFAULT_BATCH_SIZE = 500;

	/** 批次間延遲（毫秒）*/
	public const DEFAULT_SLEEP_MS = 100;

	/**
	 * 遷移一個實體類型下的一個群組
	 *
	 * @param string $entity_type
	 * @param string $group_name
	 * @param array  $options {
	 *   @type int  $batch_size 每批筆數
	 *   @type int  $sleep_ms   批次間延遲毫秒
	 *   @type bool $resume     是否從斷點續傳
	 *   @type bool $dry_run    乾跑（不實際寫入）
	 * }
	 * @return array 統計報告
	 */
	public static function migrate_group(
		string $entity_type,
		string $group_name,
		array $options = array()
	): array {

		$defaults = array(
			'batch_size' => self::DEFAULT_BATCH_SIZE,
			'sleep_ms'   => self::DEFAULT_SLEEP_MS,
			'resume'     => true,
			'dry_run'    => false,
		);
		$options  = wp_parse_args( $options, $defaults );

		$adapter = TMDO_Entity_Registry::get_adapter( $entity_type );
		if ( ! $adapter ) {
			return self::error_result( "Adapter not found: {$entity_type}" );
		}

		$group_fields = TMDO_Entity_Registry::get_group_fields( $entity_type, $group_name );
		if ( empty( $group_fields ) ) {
			return self::error_result( "Group not registered: {$entity_type}/{$group_name}" );
		}

		$managed_keys = array_column( $group_fields, 'key' );
		if ( empty( $managed_keys ) ) {
			return self::error_result( 'No keys to migrate' );
		}

		$target_table = TMDO_Schema_Manager::get_table_name( $entity_type, $group_name );
		if ( ! TMDO_Schema_Manager::table_exists( $target_table ) && ! $options['dry_run'] ) {
			return self::error_result( "Target table does not exist: {$target_table}" );
		}

		// 斷點
		$last_id = $options['resume']
			? self::get_checkpoint( $entity_type, $group_name )
			: 0;

		// 標記開始
		if ( ! $options['dry_run'] ) {
			self::mark_migration_started( $entity_type, $group_name );
		}

		$stats = array(
			'entity_type' => $entity_type,
			'group'       => $group_name,
			'migrated'    => 0,
			'errors'      => 0,
			'skipped'     => 0,
			'elapsed_sec' => 0,
			'dry_run'     => $options['dry_run'],
		);

		$start_time = microtime( true );

		global $wpdb;
		$meta_table = $adapter->get_native_meta_table();
		$id_col     = $adapter->get_entity_id_column();
		$field_map  = array_column( $group_fields, null, 'key' );

		// 建立 IN 子句佔位符
		$keys_placeholders = implode( ',', array_fill( 0, count( $managed_keys ), '%s' ) );

		do {
			// Cursor-based 分頁
			$query = $wpdb->prepare(
				"SELECT DISTINCT `{$id_col}` FROM `{$meta_table}`
				 WHERE `meta_key` IN ({$keys_placeholders})
				   AND `{$id_col}` > %d
				 ORDER BY `{$id_col}` ASC
				 LIMIT %d",
				...array_merge( $managed_keys, array( $last_id, $options['batch_size'] ) )
			);

			$entity_ids = $wpdb->get_col( $query );

			if ( empty( $entity_ids ) ) {
				break;
			}

			foreach ( $entity_ids as $entity_id ) {
				$entity_id = (int) $entity_id;

				try {
					$migrated = self::migrate_single_entity(
						$entity_type,
						$group_name,
						$entity_id,
						$managed_keys,
						$field_map,
						$adapter,
						$options['dry_run']
					);

					if ( $migrated ) {
						++$stats['migrated'];
					} else {
						++$stats['skipped'];
					}
				} catch ( \Throwable $e ) {
					++$stats['errors'];
					error_log(
						sprintf(
							'[UAE Migration] Error %s/%s ID=%d: %s',
							$entity_type,
							$group_name,
							$entity_id,
							$e->getMessage()
						)
					);
				}

				$last_id = $entity_id;
			}

			// 更新斷點
			if ( ! $options['dry_run'] ) {
				self::update_checkpoint( $entity_type, $group_name, $last_id, $stats['migrated'] );
			}

			// 釋放記憶體
			$wpdb->flush();

			// 延遲（降低 DB 負載）
			if ( $options['sleep_ms'] > 0 ) {
				usleep( $options['sleep_ms'] * 1000 );
			}
		} while ( count( $entity_ids ) === $options['batch_size'] );

		// 標記完成
		if ( ! $options['dry_run'] ) {
			self::mark_migration_completed( $entity_type, $group_name );
		}

		$stats['elapsed_sec'] = round( microtime( true ) - $start_time, 2 );

		return $stats;
	}

	/**
	 * 遷移單一 entity 的所有 meta
	 */
	private static function migrate_single_entity(
		string $entity_type,
		string $group_name,
		int $entity_id,
		array $managed_keys,
		array $field_map,
		TMDO_Entity_Adapter_Interface $adapter,
		bool $dry_run
	): bool {
		global $wpdb;

		$meta_table = $adapter->get_native_meta_table();
		$id_col     = $adapter->get_entity_id_column();

		// 取出此 entity 所有相關的 meta
		$placeholders = implode( ',', array_fill( 0, count( $managed_keys ), '%s' ) );

		$metas = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT `meta_key`, `meta_value` FROM `{$meta_table}`
			 WHERE `{$id_col}` = %d AND `meta_key` IN ({$placeholders})",
				...array_merge( array( $entity_id ), $managed_keys )
			),
			ARRAY_A
		);

		if ( empty( $metas ) ) {
			return false;
		}

		// 組裝 row 資料
		$data    = array( $id_col => $entity_id );
		$formats = array( '%d' );

		foreach ( $metas as $meta ) {
			$key   = $meta['meta_key'];
			$value = $meta['meta_value'];

			if ( ! isset( $field_map[ $key ] ) ) {
				continue;
			}

			$field_def = $field_map[ $key ];

			// 安全反序列化 — wp_usermeta 是使用者可寫表，攻擊者可植入序列化物件
			// 觸發 __wakeup/__destruct gadget chain。allowed_classes=false 阻擋。
			$value = self::safe_unserialize( $value );

			$col = TMDO_Schema_Manager::sanitize_column_name( $key );

			$data[ $col ] = TMDO_Type_Caster::to_db( $value, $field_def );
			$formats[]    = TMDO_Type_Caster::get_wpdb_format( $field_def['type'] );
		}

		if ( count( $data ) <= 1 ) {
			return false;
		}

		if ( $dry_run ) {
			return true;
		}

		$target_table = TMDO_Schema_Manager::get_table_name( $entity_type, $group_name );

		// REPLACE 作 Upsert
		return $wpdb->replace( $target_table, $data, $formats ) !== false;
	}

	// ─────────────────────────────────────────────────────────
	// 單批次非同步遷移（WP Cron 用）
	// ─────────────────────────────────────────────────────────

	/**
	 * 執行一個批次遷移並回傳進度（由 WP Cron 驅動，自動重排直到完成）。
	 *
	 * @param string $entity_type
	 * @param string $group_name
	 * @param int    $batch_size
	 * @return array{done:bool,migrated:int,last_id:int,total:int,status:string,error?:string}
	 */
	public static function migrate_group_batch(
		string $entity_type,
		string $group_name,
		int $batch_size = self::DEFAULT_BATCH_SIZE
	): array {
		$adapter = TMDO_Entity_Registry::get_adapter( $entity_type );
		if ( ! $adapter ) {
			return array(
				'done'     => true,
				'migrated' => 0,
				'last_id'  => 0,
				'total'    => 0,
				'status'   => 'error',
				'error'    => "Adapter not found: {$entity_type}",
			);
		}

		$group_fields = TMDO_Entity_Registry::get_group_fields( $entity_type, $group_name );
		if ( empty( $group_fields ) ) {
			return array(
				'done'     => true,
				'migrated' => 0,
				'last_id'  => 0,
				'total'    => 0,
				'status'   => 'error',
				'error'    => "Group not registered: {$entity_type}/{$group_name}",
			);
		}

		$managed_keys = array_column( $group_fields, 'key' );
		$target_table = TMDO_Schema_Manager::get_table_name( $entity_type, $group_name );

		if ( ! TMDO_Schema_Manager::table_exists( $target_table ) ) {
			return array(
				'done'     => true,
				'migrated' => 0,
				'last_id'  => 0,
				'total'    => 0,
				'status'   => 'error',
				'error'    => "Target table not found: {$target_table}",
			);
		}

		global $wpdb;
		$status_table = self::get_status_table();

		$row = $wpdb->get_row(
			$wpdb->prepare(
				"SELECT last_id, total_migrated FROM `{$status_table}` WHERE entity_type = %s AND group_name = %s",
				$entity_type,
				$group_name
			),
			ARRAY_A
		);

		$last_id    = (int) ( $row['last_id'] ?? 0 );
		$prev_total = (int) ( $row['total_migrated'] ?? 0 );

		self::mark_migration_started( $entity_type, $group_name );

		$meta_table        = $adapter->get_native_meta_table();
		$id_col            = $adapter->get_entity_id_column();
		$field_map         = array_column( $group_fields, null, 'key' );
		$keys_placeholders = implode( ',', array_fill( 0, count( $managed_keys ), '%s' ) );

		$entity_ids = $wpdb->get_col(
			$wpdb->prepare(
				"SELECT DISTINCT `{$id_col}` FROM `{$meta_table}`
				 WHERE `meta_key` IN ({$keys_placeholders})
				   AND `{$id_col}` > %d
				 ORDER BY `{$id_col}` ASC
				 LIMIT %d",
				...array_merge( $managed_keys, array( $last_id, $batch_size ) )
			)
		);

		$batch_migrated = 0;
		foreach ( $entity_ids as $entity_id ) {
			$entity_id = (int) $entity_id;
			try {
				if ( self::migrate_single_entity( $entity_type, $group_name, $entity_id, $managed_keys, $field_map, $adapter, false ) ) {
					++$batch_migrated;
				}
			} catch ( \Throwable $e ) {
				error_log( sprintf( '[UAE Migration Batch] Error %s/%s ID=%d: %s', $entity_type, $group_name, $entity_id, $e->getMessage() ) );
			}
			$last_id = $entity_id;
		}

		$total = $prev_total + $batch_migrated;
		$done  = count( $entity_ids ) < $batch_size;

		if ( $done ) {
			self::mark_migration_completed( $entity_type, $group_name );
		} else {
			self::update_checkpoint( $entity_type, $group_name, $last_id, $total );
		}

		$wpdb->flush();

		return array(
			'done'     => $done,
			'migrated' => $batch_migrated,
			'last_id'  => $last_id,
			'total'    => $total,
			'status'   => $done ? 'completed' : 'running',
		);
	}

	// ─────────────────────────────────────────────────────────
	// 斷點管理
	// ─────────────────────────────────────────────────────────

	private static function get_status_table(): string {
		global $wpdb;
		return $wpdb->prefix . TMDO_TABLE_PREFIX . 'migration_status';
	}

	public static function get_checkpoint( string $entity_type, string $group_name ): int {
		global $wpdb;
		$table = self::get_status_table();

		$last_id = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT last_id FROM `{$table}` WHERE entity_type = %s AND group_name = %s",
				$entity_type,
				$group_name
			)
		);

		return (int) ( $last_id ?? 0 );
	}

	private static function update_checkpoint( string $entity_type, string $group_name, int $last_id, int $total ): void {
		global $wpdb;
		$table = self::get_status_table();

		$wpdb->replace(
			$table,
			array(
				'entity_type'    => $entity_type,
				'group_name'     => $group_name,
				'last_id'        => $last_id,
				'total_migrated' => $total,
				'status'         => 'running',
			),
			array( '%s', '%s', '%d', '%d', '%s' )
		);
	}

	private static function mark_migration_started( string $entity_type, string $group_name ): void {
		global $wpdb;
		$table = self::get_status_table();

		$existing = $wpdb->get_var(
			$wpdb->prepare(
				"SELECT id FROM `{$table}` WHERE entity_type = %s AND group_name = %s",
				$entity_type,
				$group_name
			)
		);

		if ( $existing ) {
			$wpdb->update(
				$table,
				array(
					'status'     => 'running',
					'started_at' => current_time( 'mysql' ),
				),
				array( 'id' => $existing ),
				array( '%s', '%s' ),
				array( '%d' )
			);
		} else {
			$wpdb->insert(
				$table,
				array(
					'entity_type' => $entity_type,
					'group_name'  => $group_name,
					'status'      => 'running',
					'started_at'  => current_time( 'mysql' ),
				),
				array( '%s', '%s', '%s', '%s' )
			);
		}
	}

	private static function mark_migration_completed( string $entity_type, string $group_name ): void {
		global $wpdb;
		$table = self::get_status_table();

		$wpdb->update(
			$table,
			array(
				'status'       => 'completed',
				'completed_at' => current_time( 'mysql' ),
			),
			array(
				'entity_type' => $entity_type,
				'group_name'  => $group_name,
			),
			array( '%s', '%s' ),
			array( '%s', '%s' )
		);
	}

	public static function reset_checkpoint( string $entity_type, string $group_name ): void {
		global $wpdb;
		$wpdb->delete(
			self::get_status_table(),
			array(
				'entity_type' => $entity_type,
				'group_name'  => $group_name,
			),
			array( '%s', '%s' )
		);
	}

	// ─────────────────────────────────────────────────────────
	// 驗證
	// ─────────────────────────────────────────────────────────

	/**
	 * 驗證遷移資料完整性（抽樣比對）
	 */
	public static function verify(
		string $entity_type,
		string $group_name,
		int $sample_size = 100
	): array {
		global $wpdb;

		$adapter = TMDO_Entity_Registry::get_adapter( $entity_type );
		if ( ! $adapter ) {
			return array( 'error' => 'Adapter not found' );
		}

		$wpdo_table = TMDO_Schema_Manager::get_table_name( $entity_type, $group_name );
		$meta_table = $adapter->get_native_meta_table();
		$id_col     = $adapter->get_entity_id_column();

		if ( ! TMDO_Schema_Manager::table_exists( $wpdo_table ) ) {
			return array( 'error' => "UAE table not found: {$wpdo_table}" );
		}

		// 隨機抽樣 UAE 表中的 IDs
		$sample_ids = $wpdb->get_col(
			$wpdb->prepare(
				"SELECT `{$id_col}` FROM `{$wpdo_table}` ORDER BY RAND() LIMIT %d",
				$sample_size
			)
		);

		if ( empty( $sample_ids ) ) {
			return array(
				'sampled'  => 0,
				'match'    => 0,
				'mismatch' => 0,
			);
		}

		$group_fields = TMDO_Entity_Registry::get_group_fields( $entity_type, $group_name );
		$field_map    = array_column( $group_fields, null, 'key' );
		$managed_keys = array_column( $group_fields, 'key' );

		$match    = 0;
		$mismatch = 0;
		$details  = array();

		foreach ( $sample_ids as $entity_id ) {
			$entity_id = (int) $entity_id;

			// 取 UAE 資料
			$wpdo_row = $wpdb->get_row(
				$wpdb->prepare(
					"SELECT * FROM `{$wpdo_table}` WHERE `{$id_col}` = %d",
					$entity_id
				),
				ARRAY_A
			);

			// 取原始 meta
			$placeholders = implode( ',', array_fill( 0, count( $managed_keys ), '%s' ) );
			$raw_metas    = $wpdb->get_results(
				$wpdb->prepare(
					"SELECT `meta_key`, `meta_value` FROM `{$meta_table}`
				 WHERE `{$id_col}` = %d AND `meta_key` IN ({$placeholders})",
					...array_merge( array( $entity_id ), $managed_keys )
				),
				ARRAY_A
			);

			$is_match = true;

			foreach ( $raw_metas as $raw ) {
				$key = $raw['meta_key'];
				if ( ! isset( $field_map[ $key ] ) ) {
					continue;
				}

				$raw_value  = self::safe_unserialize( $raw['meta_value'] );
				$col        = TMDO_Schema_Manager::sanitize_column_name( $key );
				$field_def  = $field_map[ $key ];
				$wpdo_value = TMDO_Type_Caster::from_db( $wpdo_row[ $col ] ?? null, $field_def );

				// v2.1.6: type-aware comparison. The previous `(string)` cast falsely
				// flagged numeric-precision differences (`"5678.90" !== "5678.9"`)
				// even though both are numerically equal. Aligned with
				// TMDO_Shadow_Diff_Logger::values_equal() semantics.
				if ( ! self::loose_equal( $raw_value, $wpdo_value, $field_def['type'] ?? 'text' ) ) {
					$is_match  = false;
					$details[] = array(
						'entity_id' => $entity_id,
						'key'       => $key,
						'raw'       => $raw_value,
						'uae'       => $wpdo_value,
					);
					break;
				}
			}

			$is_match ? $match++ : $mismatch++;
		}

		return array(
			'sampled'          => count( $sample_ids ),
			'match'            => $match,
			'mismatch'         => $mismatch,
			'match_rate_pct'   => count( $sample_ids ) > 0
				? round( $match / count( $sample_ids ) * 100, 2 )
				: 0,
			'mismatch_details' => array_slice( $details, 0, 10 ),
		);
	}

	// ─────────────────────────────────────────────────────────
	// 回溯（UAE → wp_*meta 反向遷移）
	// ─────────────────────────────────────────────────────────

	/**
	 * 反向遷移：將 UAE 表資料寫回 wp_*meta
	 * 用於解除安裝前的資料保留
	 */
	public static function rollback_group(
		string $entity_type,
		string $group_name,
		array $options = array()
	): array {
		$defaults = array(
			'batch_size' => 500,
			'sleep_ms'   => 50,
		);
		$options  = wp_parse_args( $options, $defaults );

		global $wpdb;

		$adapter = TMDO_Entity_Registry::get_adapter( $entity_type );
		if ( ! $adapter ) {
			return self::error_result( "Adapter not found: {$entity_type}" );
		}

		$wpdo_table = TMDO_Schema_Manager::get_table_name( $entity_type, $group_name );
		$meta_table = $adapter->get_native_meta_table();
		$id_col     = $adapter->get_entity_id_column();

		$group_fields = TMDO_Entity_Registry::get_group_fields( $entity_type, $group_name );
		$field_map    = array_column( $group_fields, null, 'key' );

		$stats   = array(
			'written' => 0,
			'errors'  => 0,
		);
		$last_id = 0;

		do {
			$rows = $wpdb->get_results(
				$wpdb->prepare(
					"SELECT * FROM `{$wpdo_table}` WHERE `{$id_col}` > %d ORDER BY `{$id_col}` ASC LIMIT %d",
					$last_id,
					$options['batch_size']
				),
				ARRAY_A
			);

			if ( empty( $rows ) ) {
				break;
			}

			foreach ( $rows as $row ) {
				$entity_id = (int) $row[ $id_col ];

				foreach ( $field_map as $key => $field_def ) {
					$col   = TMDO_Schema_Manager::sanitize_column_name( $key );
					$value = TMDO_Type_Caster::from_db( $row[ $col ] ?? null, $field_def );

					if ( $value === null ) {
						continue;
					}

					// 直接寫 wp_*meta，繞過 UAE 攔截（因為我們正在反向遷移）
					$wpdb->replace(
						$meta_table,
						array(
							$id_col      => $entity_id,
							'meta_key'   => $key,
							'meta_value' => maybe_serialize( $value ),
						),
						array( '%d', '%s', '%s' )
					);
					++$stats['written'];
				}

				$last_id = $entity_id;
			}

			$wpdb->flush();
			usleep( $options['sleep_ms'] * 1000 );

		} while ( count( $rows ) === $options['batch_size'] );

		return $stats;
	}

	private static function error_result( string $message ): array {
		return array(
			'error'    => $message,
			'migrated' => 0,
			'errors'   => 1,
		);
	}

	/**
	 * Object-safe replacement for `maybe_unserialize()`.
	 *
	 * `wp_usermeta` / `wp_postmeta` rows can contain attacker-planted serialized
	 * objects. `maybe_unserialize()` calls `unserialize()` with default options,
	 * which materializes objects and triggers `__wakeup`/`__destruct` gadgets.
	 * During backfill the migration engine runs in admin context, so any gadget
	 * chain in vendor/ becomes RCE.
	 *
	 * This wrapper passes `allowed_classes => false` so PHP returns
	 * `__PHP_Incomplete_Class` instances without ever invoking magic methods on
	 * the original class. We then convert those to null so they cannot leak
	 * into a flat-table column.
	 *
	 * @param mixed $value Raw meta_value from native EAV table.
	 * @return mixed Unserialized array/scalar, or original string if not serialized.
	 */
	private static function safe_unserialize( $value ) {
		if ( ! is_string( $value ) ) {
			return $value;
		}

		$trimmed = trim( $value );

		// Cheap inline detector — does not rely on WP's is_serialized() so this
		// function works in CLI / standalone migration contexts. Mirrors the
		// shape checks WP does: type-tag at offset 0, ':' at offset 1, plausible
		// terminator. PHP serialize tokens are: a (array), O (object),
		// s (string), i (int), d (float), b (bool), N; (null).
		if ( 'N;' !== $trimmed ) {
			if ( strlen( $trimmed ) < 4 || ':' !== ( $trimmed[1] ?? '' ) ) {
				return $value;
			}
			if ( ! in_array( $trimmed[0] ?? '', array( 'a', 'O', 's', 'i', 'd', 'b' ), true ) ) {
				return $value;
			}
		}

		// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_unserialize -- explicit allowed_classes=false hardens against object injection.
		$result = @unserialize( $trimmed, array( 'allowed_classes' => false ) );

		if ( false === $result && 'b:0;' !== $trimmed ) {
			return $value;
		}

		// Strip __PHP_Incomplete_Class artefacts (allowed_classes=false replaces
		// any object marker with this stub). They must never reach a flat-table
		// JSON column or a downstream consumer.
		if ( is_object( $result ) ) {
			return null;
		}
		if ( is_array( $result ) ) {
			array_walk_recursive(
				$result,
				static function ( &$v ) {
					if ( is_object( $v ) ) {
						$v = null;
					}
				}
			);
		}

		return $result;
	}

	/**
	 * Type-aware loose equality check for verify() sample comparison.
	 *
	 * Mirrors TMDO_Shadow_Diff_Logger::values_equal() so the two divergence
	 * detection paths (cron verify + live shadow_compare) agree on what
	 * constitutes a real mismatch vs a representation difference.
	 *
	 * @param mixed  $eav  Native wp_*meta value (after maybe_unserialize).
	 * @param mixed  $flat Value from the WPDO flat table (after type cast).
	 * @param string $type Field type from registry (text/integer/decimal/...).
	 * @return bool
	 */
	private static function loose_equal( $eav, $flat, string $type ): bool {
		if ( $eav === $flat ) {
			return true;
		}
		if ( in_array( $type, array( 'integer', 'decimal' ), true ) ) {
			return is_numeric( $eav ) && is_numeric( $flat ) && (float) $eav === (float) $flat;
		}
		if ( 'boolean' === $type ) {
			return (bool) $eav === (bool) $flat;
		}
		if ( 'json' === $type || is_array( $eav ) || is_array( $flat ) ) {
			return wp_json_encode( $eav ) === wp_json_encode( $flat );
		}
		return (string) $eav === (string) $flat;
	}

	/**
	 * 取得所有遷移狀態
	 */
	public static function get_all_statuses(): array {
		global $wpdb;
		$table = self::get_status_table();

		return $wpdb->get_results( "SELECT * FROM `{$table}` ORDER BY entity_type, group_name", ARRAY_A ) ?: array();
	}
}