<?php
/**
 * IndexNow integration — ping Bing/Yandex on content changes.
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class AIREWP_IndexNow {

    private const ENDPOINTS = [
        'https://api.indexnow.org/indexnow',
        'https://www.bing.com/indexnow',
    ];

    private const TRANSIENT_PREFIX = 'airewp_indexnow_';

    public function __construct() {
        // Hook handled by main plugin class (on_content_change)
    }

    /**
     * Generate the IndexNow key verification file.
     */
    public static function generate_key_file( string $key ): void {
        if ( empty( $key ) || ! preg_match( '/^[a-f0-9]{64}$/', $key ) ) {
            return;
        }

        $file = AIREWP_ROOT_PATH . $key . '.txt';
        AI_Ready_WP::write_file( $file, $key );
    }

    /**
     * Ping IndexNow for a single URL.
     */
    public static function ping_url( string $url, array $settings ): void {
        $key = $settings['indexnow_key'] ?? '';
        if ( empty( $key ) || empty( $url ) ) {
            return;
        }

        // Debounce: don't ping same URL within 5 minutes
        $hash      = md5( $url );
        $transient = self::TRANSIENT_PREFIX . $hash;
        if ( get_transient( $transient ) ) {
            return;
        }
        set_transient( $transient, true, 5 * MINUTE_IN_SECONDS );

        $host         = wp_parse_url( home_url(), PHP_URL_HOST );
        $key_location = home_url( '/' . $key . '.txt' );

        $body = wp_json_encode( [
            'host'        => $host,
            'key'         => $key,
            'keyLocation' => $key_location,
            'urlList'     => [ $url ],
        ] );

        foreach ( self::ENDPOINTS as $endpoint ) {
            wp_remote_post( $endpoint, [
                'body'     => $body,
                'headers'  => [ 'Content-Type' => 'application/json' ],
                'timeout'  => 10,
                'blocking' => false, // Fire and forget
            ] );
        }
    }

    /**
     * Batch ping multiple URLs (e.g., on regeneration).
     */
    public static function ping_batch( array $urls, array $settings ): void {
        $key = $settings['indexnow_key'] ?? '';
        if ( empty( $key ) || empty( $urls ) ) {
            return;
        }

        $host         = wp_parse_url( home_url(), PHP_URL_HOST );
        $key_location = home_url( '/' . $key . '.txt' );

        // IndexNow max 10000 per batch
        $batches = array_chunk( $urls, 10000 );

        foreach ( $batches as $batch ) {
            $body = wp_json_encode( [
                'host'        => $host,
                'key'         => $key,
                'keyLocation' => $key_location,
                'urlList'     => $batch,
            ] );

            foreach ( self::ENDPOINTS as $endpoint ) {
                wp_remote_post( $endpoint, [
                    'body'     => $body,
                    'headers'  => [ 'Content-Type' => 'application/json' ],
                    'timeout'  => 15,
                    'blocking' => false,
                ] );
            }
        }
    }
}