<?php
/**
 * TMDO_Conflict_Detector — 偵測 UAE 與 UAEPG 同欄位衝突
 *
 * 背景:
 *   UAEPG(PostgreSQL sidecar)以 metadata filter priority 5 攔截,
 *   UAE 在 priority 10 攔截。若同一 meta_key 被雙方都登錄,
 *   UAEPG 會先短路 return,UAE 寫入永遠不執行,資料靜默遺失。
 *
 * 本類別在欄位登錄階段完成後(init:25)掃描雙方 Registry,
 * 找出 overlap 並:
 *   1. 寫入 error log(供 CI / 監控系統消化)
 *   2. 在管理後台顯示紅色 admin_notices
 *   3. 提供 TMDO_Conflict_Detector::get_conflicts() 與 CLI 指令 wp uae conflicts 查詢
 *
 * 結果 cache 在 static property 內,單 request 內不重複掃描。
 *
 * @package WP_Data_Optimizer
 * @since   1.1.2
 */

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_Conflict_Detector {

	/**
	 * @var array<int, array{entity_type:string, meta_key:string, wpdo_group:string, uaepg_group:string}>|null
	 */
	private static ?array $cache = null;

	public static function init(): void {
		// init:25 — register_default_fields 於 init:20 觸發 wpdo_register_fields,
		// UAEPG 亦在 init:20 觸發 uaepg_register_fields;此時 priority 25 可確保雙邊皆完成登錄。
		add_action( 'init', array( self::class, 'scan' ), 25 );

		if ( is_admin() ) {
			add_action( 'admin_notices', array( self::class, 'maybe_render_admin_notice' ) );
		}
	}

	/**
	 * 掃描並 cache 衝突清單。
	 *
	 * @return array<int, array{entity_type:string, meta_key:string, wpdo_group:string, uaepg_group:string}>
	 */
	public static function scan(): array {
		if ( self::$cache !== null ) {
			return self::$cache;
		}

		if ( ! class_exists( 'UAEPG_Registry' ) ) {
			return self::$cache = array();
		}

		$conflicts = array();

		foreach ( TMDO_Entity_Registry::get_all_fields() as $entity_type => $fields_by_key ) {
			foreach ( $fields_by_key as $meta_key => $wpdo_field ) {
				if ( ! UAEPG_Registry::is_managed( $entity_type, $meta_key ) ) {
					continue;
				}

				$uaepg_field = UAEPG_Registry::get_field( $entity_type, $meta_key );

				$conflicts[] = array(
					'entity_type' => $entity_type,
					'meta_key'    => $meta_key,
					'wpdo_group'  => $wpdo_field['group'] ?? '(unknown)',
					'uaepg_group' => $uaepg_field['group'] ?? '(unknown)',
				);
			}
		}

		if ( $conflicts ) {
			TMDO_Logger::error(
				'schema_registry',
				'field_registration_conflict',
				sprintf( 'Field registration conflict: %d field(s) affected', count( $conflicts ) ),
				$conflicts
			);
		}

		return self::$cache = $conflicts;
	}

	/**
	 * 取得衝突清單(若尚未掃描,觸發掃描)。
	 */
	public static function get_conflicts(): array {
		return self::$cache ?? self::scan();
	}

	/**
	 * 測試用:強制清除 cache,下次 scan() 會重跑。
	 *
	 * @internal
	 */
	public static function reset_cache(): void {
		self::$cache = null;
	}

	/**
	 * 若有衝突則輸出管理後台紅色通知。
	 */
	public static function maybe_render_admin_notice(): void {
		$conflicts = self::get_conflicts();
		if ( ! $conflicts ) {
			return;
		}

		if ( ! TMDO_Capability::current_user_can_admin() ) {
			return;
		}

		$count = count( $conflicts );
		$lines = array();
		foreach ( array_slice( $conflicts, 0, 5 ) as $c ) {
			$lines[] = sprintf(
				'%s / %s(UAE 群組「%s」 ↔ UAEPG 群組「%s」)',
				esc_html( $c['entity_type'] ),
				esc_html( $c['meta_key'] ),
				esc_html( $c['wpdo_group'] ),
				esc_html( $c['uaepg_group'] )
			);
		}
		$extra = $count > 5 ? sprintf( __( '… 另有 %d 個欄位未顯示', '2meet-data-optimizer' ), $count - 5 ) : '';

		printf(
			'<div class="notice notice-error"><p><strong>%s</strong></p><ul style="list-style:disc;margin-left:20px;"><li>%s</li></ul>%s<p>%s <code>wp uae conflicts</code></p></div>',
			esc_html(
				sprintf(
				/* translators: %d: conflict count */
					__( 'UAE × UAEPG 欄位衝突偵測:發現 %d 個同 meta_key 被雙方 Registry 重複登錄 — UAEPG 會搶先短路,UAE 寫入將被靜默跳過', '2meet-data-optimizer' ),
					$count
				)
			),
			// $lines elements were each individually esc_html()'d above (lines 121-124).
			// implode joins escaped strings with literal HTML markers — safe.
			implode( '</li><li>', $lines ), // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- pre-escaped above.
			$extra ? '<p><em>' . esc_html( $extra ) . '</em></p>' : '',
			esc_html__( '查看完整清單:', '2meet-data-optimizer' )
		);
	}
}