<?php
/**
 * TMDO_Auto_Promoter — shadow_read 穩定期後自動升級到 aeav_only。
 *
 * 僅針對 `shadow_read` 做自動升級(升級到 aeav_only),其他 mode 不自動動。
 * 判斷條件(皆滿足才觸發):
 *   1. 當前 mode = shadow_read
 *   2. 進入 shadow_read 距今 ≥ `min_days`
 *   3. 進入後 `shadow_diffs` 表中該 entity 的 diff 筆數 = 0
 *
 * 這符合「穩定期沒問題就進 production」的安全遷移原則。
 * 若 diff 出現,規則永不觸發;人工介入即可。
 *
 * 可由 option 或 filter 調整:
 *   option `wpdo_auto_promote_enabled`     — 全域開關(bool,預設 false)
 *   option `wpdo_auto_promote_min_days`    — 停留天數門檻(int,預設 7)
 *   filter `wpdo_auto_promote_should_run`  — per-entity 覆寫(bool default)
 *
 * @package WP_Data_Optimizer
 * @since   1.5.0
 */

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_Auto_Promoter {

	public const OPT_ENABLED      = 'wpdo_auto_promote_enabled';
	public const OPT_MIN_DAYS     = 'wpdo_auto_promote_min_days';
	public const DEFAULT_MIN_DAYS = 7;

	public const CRON_HOOK = 'wpdo_auto_promote_check';

	public static function init(): void {
		add_action( self::CRON_HOOK, array( self::class, 'check_all' ) );
		add_action( 'init', array( self::class, 'maybe_schedule' ), 30 );
	}

	/**
	 * 首次啟用時排入 daily cron。Option 關閉時會停掉,開啟時重排。
	 */
	public static function maybe_schedule(): void {
		$enabled   = (bool) get_option( self::OPT_ENABLED, false );
		$scheduled = wp_next_scheduled( self::CRON_HOOK );

		if ( $enabled && ! $scheduled ) {
			wp_schedule_event( time() + HOUR_IN_SECONDS, 'daily', self::CRON_HOOK );
		} elseif ( ! $enabled && $scheduled ) {
			wp_unschedule_event( $scheduled, self::CRON_HOOK );
		}
	}

	/**
	 * 遍歷所有 entity,符合條件者升級為 aeav_only。
	 *
	 * @return array<string, string> entity_type → 結果('promoted'|'not_ready'|'no_diff_yet'|'disabled_globally')
	 */
	public static function check_all(): array {
		$results = array();

		if ( ! (bool) get_option( self::OPT_ENABLED, false ) ) {
			foreach ( array( 'post', 'user', 'term', 'comment' ) as $type ) {
				$results[ $type ] = 'disabled_globally';
			}
			return $results;
		}

		$min_days    = (int) get_option( self::OPT_MIN_DAYS, self::DEFAULT_MIN_DAYS );
		$entered_all = get_option( TMDO_Mode_Manager::OPT_ENTERED_AT, array() );

		foreach ( array( 'post', 'user', 'term', 'comment' ) as $type ) {
			$results[ $type ] = self::check_entity( $type, $min_days, $entered_all );
		}

		return $results;
	}

	/**
	 * 評估單一 entity 是否可升級。
	 *
	 * @return string 'promoted' | 'not_shadow_read' | 'not_ready' | 'has_diff' | 'vetoed'
	 */
	public static function check_entity( string $type, int $min_days, array $entered_all ): string {
		$current = TMDO_Mode_Manager::get( $type );
		if ( $current !== TMDO_Mode_Manager::MODE_SHADOW_READ ) {
			return 'not_shadow_read';
		}

		$entered_at = isset( $entered_all[ $type ] ) ? (int) $entered_all[ $type ] : 0;
		if ( $entered_at === 0 || ( time() - $entered_at ) < $min_days * DAY_IN_SECONDS ) {
			return 'not_ready';
		}

		$diff_counts = TMDO_Shadow_Diff_Logger::count_by_entity();
		$count       = (int) ( $diff_counts[ $type ] ?? 0 );
		if ( $count > 0 ) {
			return 'has_diff';
		}

		// 讓外部 filter 最後一次 veto(例如:還在外部驗證期間)
		$should = apply_filters( 'wpdo_auto_promote_should_run', true, $type, $entered_at, $count );
		if ( ! $should ) {
			return 'vetoed';
		}

		$result = TMDO_Mode_Manager::set( $type, TMDO_Mode_Manager::MODE_AEAV_ONLY );
		if ( is_wp_error( $result ) ) {
			TMDO_Logger::error(
				'auto_promoter',
				'auto_promote_failed',
				$result->get_error_message(),
				array( 'entity_type' => $type )
			);
			return 'error';
		}

		TMDO_Logger::info(
			'auto_promote_success',
			array(
				'entity_type'  => $type,
				'entered_at'   => gmdate( 'c', $entered_at ),
				'days_elapsed' => (int) ( ( time() - $entered_at ) / DAY_IN_SECONDS ),
				'min_days'     => $min_days,
			)
		);

		do_action( 'wpdo_auto_promoted', $type, $entered_at, $min_days );

		return 'promoted';
	}
}