<?php
/**
 * Batch 14 — Yoast SEO deep (Pro-equivalent, net-new).
 *
 * Yoast-specific surface beyond the generic seo_* family (b2): cornerstone,
 * primary category, SEO/readability scores, redirects (Premium), sitemap state.
 * Guarded by WPSEO_VERSION — inert unless Yoast is active.
 * GPL-2.0-or-later. See NOTICE.md.
 */

namespace AskTamMCP\Extensions;

defined('ABSPATH') || exit;

class Batch14 {

    private const MAP = [
        'title'            => '_yoast_wpseo_title',
        'metadesc'         => '_yoast_wpseo_metadesc',
        'focuskw'          => '_yoast_wpseo_focuskw',
        'canonical'        => '_yoast_wpseo_canonical',
        'og_title'         => '_yoast_wpseo_opengraph-title',
        'og_description'   => '_yoast_wpseo_opengraph-description',
        'og_image'         => '_yoast_wpseo_opengraph-image',
        'twitter_title'    => '_yoast_wpseo_twitter-title',
        'twitter_description' => '_yoast_wpseo_twitter-description',
        'cornerstone'      => '_yoast_wpseo_is_cornerstone',
        'primary_category' => '_yoast_wpseo_primary_category',
        'noindex'          => '_yoast_wpseo_meta-robots-noindex',  // '1' noindex, '2' index, '' default
        'nofollow'         => '_yoast_wpseo_meta-robots-nofollow', // '1' nofollow, '' default
        'seo_score'        => '_yoast_wpseo_linkdex',
        'readability'      => '_yoast_wpseo_content_score',
    ];

    public static function register($registry): void {
        if (!defined('WPSEO_VERSION')) return;

        $def = function (string $name, string $desc, array $props, array $required, string $scope, string $method) {
            $schema = ['type' => 'object', 'properties' => $props];
            if ($required) $schema['required'] = $required;
            return ['name' => $name, 'description' => $desc, 'scope' => $scope,
                    'handler' => 'AskTamMCP\\Extensions\\Batch14::' . $method, 'inputSchema' => $schema];
        };

        $registry->register($def('yoast_detect', 'Report Yoast SEO version, whether Premium is active, and whether the XML sitemap is enabled.',
            [], [], 'read', 'detect'));

        $registry->register($def('yoast_get_meta', 'Get all Yoast meta for a post: title, metadesc, focus keyword, canonical, OG/Twitter, cornerstone flag, primary category, robots, and SEO/readability scores.',
            ['post_id' => ['type' => 'integer']], ['post_id'], 'read', 'getMeta'));

        $registry->register($def('yoast_set_meta', 'Set Yoast meta on a post. Only supplied fields change. cornerstone is boolean; noindex/nofollow accept true/false.',
            ['post_id' => ['type' => 'integer'], 'title' => ['type' => 'string'], 'metadesc' => ['type' => 'string'],
             'focuskw' => ['type' => 'string'], 'canonical' => ['type' => 'string'],
             'og_title' => ['type' => 'string'], 'og_description' => ['type' => 'string'], 'og_image' => ['type' => 'string'],
             'twitter_title' => ['type' => 'string'], 'twitter_description' => ['type' => 'string'],
             'cornerstone' => ['type' => 'boolean'], 'primary_category' => ['type' => 'integer'],
             'noindex' => ['type' => 'boolean'], 'nofollow' => ['type' => 'boolean']],
            ['post_id'], 'write', 'setMeta'));

        $registry->register($def('yoast_bulk_audit', 'Scan posts/pages for Yoast problems: missing meta description, missing focus keyword, or low SEO score (<40). Returns the offenders.',
            ['post_types' => ['type' => 'array'], 'per_page' => ['type' => 'integer', 'default' => 100]], [], 'read', 'bulkAudit'));

        $registry->register($def('yoast_list_redirects', 'List Yoast Premium redirects (origin -> target, type). Requires Yoast Premium; reports supported=false otherwise.',
            [], [], 'read', 'listRedirects'));
    }

    public static function detect(array $args): array {
        $opts = get_option('wpseo', []);
        return [
            'version' => WPSEO_VERSION,
            'premium' => defined('WPSEO_PREMIUM_VERSION') ? WPSEO_PREMIUM_VERSION : false,
            'sitemap_enabled' => !empty($opts['enable_xml_sitemap']),
            'sitemap_url' => home_url('/sitemap_index.xml'),
        ];
    }

    public static function getMeta(array $args): array {
        $id = (int) ($args['post_id'] ?? 0);
        if (!get_post($id)) throw new \RuntimeException('Post not found: ' . $id);
        $out = ['post_id' => $id];
        foreach (self::MAP as $k => $mk) {
            $v = get_post_meta($id, $mk, true);
            if ($k === 'cornerstone') $v = ($v === '1');
            $out[$k] = $v === '' ? null : $v;
        }
        return $out;
    }

    public static function setMeta(array $args): array {
        $id = (int) ($args['post_id'] ?? 0);
        if (!get_post($id)) throw new \RuntimeException('Post not found: ' . $id);
        $changed = [];
        foreach (self::MAP as $k => $mk) {
            if (!array_key_exists($k, $args)) continue;
            if (in_array($k, ['seo_score', 'readability'], true)) continue; // computed, not user-set
            $val = $args[$k];
            if ($k === 'cornerstone') $val = !empty($val) ? '1' : '';
            elseif ($k === 'noindex') $val = !empty($val) ? '1' : '2';
            elseif ($k === 'nofollow') $val = !empty($val) ? '1' : '';
            else $val = (string) $val;
            update_post_meta($id, $mk, $val);
            $changed[] = $k;
        }
        return ['post_id' => $id, 'changed' => $changed];
    }

    public static function bulkAudit(array $args): array {
        $types = !empty($args['post_types']) && is_array($args['post_types']) ? $args['post_types'] : ['post', 'page'];
        $posts = get_posts(['post_type' => $types, 'post_status' => 'publish',
            'numberposts' => (int) ($args['per_page'] ?? 100), 'fields' => 'ids']);
        $issues = [];
        foreach ($posts as $pid) {
            $md = get_post_meta($pid, '_yoast_wpseo_metadesc', true);
            $fk = get_post_meta($pid, '_yoast_wpseo_focuskw', true);
            $sc = (int) get_post_meta($pid, '_yoast_wpseo_linkdex', true);
            $probs = [];
            if ($md === '') $probs[] = 'no_metadesc';
            if ($fk === '') $probs[] = 'no_focus_keyword';
            if ($sc > 0 && $sc < 40) $probs[] = 'low_seo_score(' . $sc . ')';
            if ($probs) $issues[] = ['id' => $pid, 'title' => get_the_title($pid), 'issues' => $probs];
        }
        return ['scanned' => count($posts), 'with_issues' => count($issues), 'offenders' => $issues];
    }

    public static function listRedirects(array $args): array {
        if (!defined('WPSEO_PREMIUM_VERSION')) {
            return ['supported' => false, 'note' => 'Yoast Premium not active; redirect manager unavailable.', 'redirects' => []];
        }
        $opt = get_option('wpseo-premium-redirects-base', []);
        $out = [];
        if (is_array($opt)) {
            foreach ($opt as $origin => $r) {
                $out[] = ['origin' => $origin, 'target' => $r['url'] ?? '', 'type' => $r['type'] ?? ''];
            }
        }
        return ['supported' => true, 'count' => count($out), 'redirects' => $out];
    }
}