<?php
/**
 * Pont SEO: llegeix i escriu la meta de Yoast o Rank Math (title, description,
 * focus keyword) al postmeta corresponent segons el plugin SEO actiu al site.
 *
 * @package Abency\Connector
 */

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

class Abency_Seo {

    /** Mapes de camps → clau de postmeta per plugin. */
    const KEYS = array(
        'yoast' => array(
            'title'         => '_yoast_wpseo_title',
            'description'   => '_yoast_wpseo_metadesc',
            'focus_keyword' => '_yoast_wpseo_focuskw',
        ),
        'rankmath' => array(
            'title'         => 'rank_math_title',
            'description'   => 'rank_math_description',
            'focus_keyword' => 'rank_math_focus_keyword',
        ),
    );

    /**
     * Plugin SEO actiu: 'yoast' | 'rankmath' | null.
     */
    public static function active_plugin() {
        if (defined('WPSEO_VERSION') || class_exists('WPSEO_Options')) {
            return 'yoast';
        }
        if (defined('RANK_MATH_VERSION') || class_exists('RankMath\\Helper')) {
            return 'rankmath';
        }

        return null;
    }

    /**
     * Llegeix la meta SEO d'un post.
     *
     * @return array{plugin: ?string, title: string, description: string, focus_keyword: string}
     */
    public static function read($post_id) {
        $plugin = self::active_plugin();

        $out = array(
            'plugin'        => $plugin,
            'title'         => '',
            'description'   => '',
            'focus_keyword' => '',
        );

        if (! $plugin) {
            return $out;
        }

        foreach (self::KEYS[$plugin] as $field => $meta_key) {
            $out[$field] = (string) get_post_meta($post_id, $meta_key, true);
        }

        return $out;
    }

    /**
     * Escriu la meta SEO d'un post (només els camps presents a $seo).
     *
     * @param  array{title?: string, description?: string, focus_keyword?: string}  $seo
     * @return bool  True si s'ha pogut escriure (hi ha un plugin SEO actiu).
     */
    public static function write($post_id, array $seo) {
        $plugin = self::active_plugin();

        if (! $plugin) {
            return false;
        }

        foreach (self::KEYS[$plugin] as $field => $meta_key) {
            if (array_key_exists($field, $seo)) {
                update_post_meta($post_id, $meta_key, sanitize_text_field($seo[$field]));
            }
        }

        return true;
    }
}