<?php
// Citami Connector — module. Loaded by citami-connector.php in a fixed
// order; never load this file on its own.
if (!defined('ABSPATH')) {
    exit;
}

/* ────────────────────────────────────────────────────────────────── */
/*  WP7 (Fase 2) — XML SITEMAP                                         */
/*  /sitemap.xml (index) → /sitemap-{type}-{n}.xml per public post     */
/*  type (1000 URLs a page) + /sitemap-taxonomies.xml. Virtual: no     */
/*  files on disk, served from the request path. noindex content is   */
/*  left out; WordPress' own sitemap is switched off while ours is on. */
/* ────────────────────────────────────────────────────────────────── */

define('CITAMI_SITEMAP_SETTINGS_OPT', 'citami_sitemap_settings');
define('CITAMI_SITEMAP_PER_PAGE', 1000);

function citami_sitemap_settings() {
    $d = array('enabled' => 'auto', 'exclude_types' => array(), 'taxonomies' => 'on');
    $s = get_option(CITAMI_SITEMAP_SETTINGS_OPT, array());
    if (is_array($s)) {
        if (isset($s['enabled']) && in_array($s['enabled'], array('auto', 'on', 'off'), true)) {
            $d['enabled'] = $s['enabled'];
        }
        if (isset($s['exclude_types']) && is_array($s['exclude_types'])) {
            $d['exclude_types'] = array_values(array_map('sanitize_key', $s['exclude_types']));
        }
        if (isset($s['taxonomies']) && $s['taxonomies'] === 'off') {
            $d['taxonomies'] = 'off';
        }
    }
    return $d;
}

function citami_sanitize_sitemap_settings($value) {
    $in = is_array($value) ? $value : array();
    $out = array('enabled' => 'auto', 'exclude_types' => array(), 'taxonomies' => 'on');
    if (isset($in['enabled']) && in_array($in['enabled'], array('auto', 'on', 'off'), true)) {
        $out['enabled'] = $in['enabled'];
    }
    if (isset($in['exclude_types']) && is_array($in['exclude_types'])) {
        $out['exclude_types'] = array_values(array_filter(array_map('sanitize_key', $in['exclude_types'])));
    }
    if (isset($in['taxonomies']) && $in['taxonomies'] === 'off') {
        $out['taxonomies'] = 'off';
    }
    return $out;
}

add_action('admin_init', function () {
    register_setting('citami_seo', CITAMI_SITEMAP_SETTINGS_OPT, array(
        'type'              => 'array',
        'sanitize_callback' => 'citami_sanitize_sitemap_settings',
        'default'           => array(),
    ));
});

function citami_sitemap_enabled() {
    $s = citami_sitemap_settings();
    if ($s['enabled'] === 'on') {
        return true;
    }
    if ($s['enabled'] === 'off') {
        return false;
    }
    return citami_active_seo_plugin() === null;
}

// WordPress core sitemap off while ours is on (never two indexes).
add_filter('wp_sitemaps_enabled', function ($enabled) {
    return citami_sitemap_enabled() ? false : $enabled;
});

/** Post types that go into the sitemap. */
function citami_sitemap_types() {
    $s = citami_sitemap_settings();
    $types = array();
    foreach (citami_seo_post_types() as $t) {
        if (!in_array($t, $s['exclude_types'], true)) {
            $types[] = $t;
        }
    }
    return $types;
}

/** Published, indexable posts of a type (ids + lastmod), page $n (1-based). */
function citami_sitemap_entries($type, $page = 1) {
    $posts = get_posts(array(
        'post_type'   => $type,
        'post_status' => 'publish',
        'numberposts' => CITAMI_SITEMAP_PER_PAGE,
        'offset'      => ($page - 1) * CITAMI_SITEMAP_PER_PAGE,
        'orderby'     => 'modified',
        'order'       => 'DESC',
    ));
    $out = array();
    foreach ((array) $posts as $p) {
        if (!is_object($p)) {
            continue;
        }
        if ((string) get_post_meta($p->ID, CITAMI_META_ROBOTS_INDEX, true) === 'noindex') {
            continue;
        }
        if ((string) get_post_meta($p->ID, '_citami_faq_page', true) === '1' && false) {
            continue; // placeholder for future exclusions
        }
        $mod = !empty($p->post_modified_gmt) ? $p->post_modified_gmt : (!empty($p->post_modified) ? $p->post_modified : $p->post_date);
        // WP11 — [[hreflang, url], …] from the hreflang module (empty = none).
        $out[] = array('loc' => get_permalink($p), 'lastmod' => citami_schema_iso_date($mod), 'alternates' => apply_filters('citami_sitemap_alternates', array(), $p));
    }
    return $out;
}

function citami_sitemap_count($type) {
    $posts = get_posts(array('post_type' => $type, 'post_status' => 'publish', 'numberposts' => -1, 'fields' => 'ids'));
    return is_array($posts) ? count($posts) : 0;
}

function citami_sitemap_xml_header() {
    return '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
}

/** The index: one entry per (type, page) + taxonomies. */
function citami_sitemap_index_xml() {
    $xml = citami_sitemap_xml_header() . '<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">' . "\n";
    foreach (citami_sitemap_types() as $type) {
        $count = citami_sitemap_count($type);
        if ($count === 0) {
            continue;
        }
        $pages = (int) ceil($count / CITAMI_SITEMAP_PER_PAGE);
        for ($n = 1; $n <= $pages; $n++) {
            $xml .= '  <sitemap><loc>' . esc_url(home_url('/sitemap-' . $type . '-' . $n . '.xml')) . '</loc></sitemap>' . "\n";
        }
    }
    if (citami_sitemap_settings()['taxonomies'] === 'on') {
        $xml .= '  <sitemap><loc>' . esc_url(home_url('/sitemap-taxonomies.xml')) . '</loc></sitemap>' . "\n";
    }
    return $xml . '</sitemapindex>' . "\n";
}

function citami_sitemap_urlset_xml(array $entries) {
    $xml = citami_sitemap_xml_header() . '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml">' . "\n";
    foreach ($entries as $e) {
        $xml .= '  <url><loc>' . esc_url($e['loc']) . '</loc>';
        if (!empty($e['lastmod'])) {
            $xml .= '<lastmod>' . esc_html($e['lastmod']) . '</lastmod>';
        }
        if (!empty($e['alternates']) && is_array($e['alternates'])) {
            foreach ($e['alternates'] as $a) {
                if (is_array($a) && isset($a[0], $a[1])) {
                    $xml .= '<xhtml:link rel="alternate" hreflang="' . esc_attr($a[0]) . '" href="' . esc_url($a[1]) . '" />';
                }
            }
        }
        $xml .= '</url>' . "\n";
    }
    return $xml . '</urlset>' . "\n";
}

function citami_sitemap_taxonomy_entries() {
    $out = array();
    if (!function_exists('get_terms') || !function_exists('get_term_link')) {
        return $out;
    }
    $taxonomies = function_exists('get_taxonomies') ? get_taxonomies(array('public' => true), 'names') : array('category', 'post_tag');
    foreach ((array) $taxonomies as $tax) {
        $terms = get_terms(array('taxonomy' => $tax, 'hide_empty' => true));
        if (!is_array($terms)) {
            continue;
        }
        foreach ($terms as $term) {
            $link = get_term_link($term);
            if (is_string($link) && $link !== '') {
                $out[] = array('loc' => $link, 'lastmod' => '');
            }
        }
    }
    return $out;
}

/** Resolves a request path to sitemap XML (null = not a sitemap URL). */
function citami_sitemap_for_path($path) {
    $path = (string) $path;
    $q = strpos($path, '?');
    if ($q !== false) {
        $path = substr($path, 0, $q);
    }
    if ($path === '/sitemap.xml' || $path === '/sitemap_index.xml') {
        return citami_sitemap_index_xml();
    }
    if ($path === '/sitemap-taxonomies.xml') {
        return citami_sitemap_urlset_xml(citami_sitemap_taxonomy_entries());
    }
    if (preg_match('#^/sitemap-([a-z0-9_]+)-(\d+)\.xml$#', $path, $m)) {
        $type = $m[1];
        if (!in_array($type, citami_sitemap_types(), true)) {
            return null;
        }
        return citami_sitemap_urlset_xml(citami_sitemap_entries($type, max(1, (int) $m[2])));
    }
    return null;
}

add_action('init', function () {
    if (is_admin() || !citami_sitemap_enabled() || empty($_SERVER['REQUEST_URI'])) {
        return;
    }
    $xml = citami_sitemap_for_path(esc_url_raw(wp_unslash($_SERVER['REQUEST_URI'])));
    if ($xml === null) {
        return;
    }
    if (!headers_sent()) {
        header('Content-Type: application/xml; charset=UTF-8');
        header('X-Robots-Tag: noindex');
    }
    echo $xml; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- application/xml response built with esc_xml() per value.
    exit;
}, 1);

// robots.txt advertises the index.
add_filter('robots_txt', function ($output) {
    if (!citami_sitemap_enabled()) {
        return $output;
    }
    $line = 'Sitemap: ' . home_url('/sitemap.xml');
    return strpos((string) $output, $line) !== false ? $output : rtrim((string) $output) . "\n\n" . $line . "\n";
}, 30);

add_action('citami_seo_settings_rows', function () {
    $s = citami_sitemap_settings();
    $opt = CITAMI_SITEMAP_SETTINGS_OPT;
    ?>
    <?php citami_seo_card_head('sitemap', 'Sitemap XML', citami_t('L\'elenco delle pagine da far scoprire a Google, Bing e agli altri motori.', 'The list of pages for Google, Bing and the other engines to discover.')); ?>
    <table class="form-table" role="presentation">
    <tr>
        <th scope="row"><?php echo esc_html(citami_t('Sitemap', 'Sitemap')); ?></th>
        <td class="citami-seo-inline">
            <select name="<?php echo esc_attr($opt); ?>[enabled]">
                <option value="auto" <?php selected($s['enabled'], 'auto'); ?>><?php echo esc_html(citami_t('Automatico (attivo se nessun altro plugin SEO)', 'Automatic (on unless another SEO plugin is active)')); ?></option>
                <option value="on" <?php selected($s['enabled'], 'on'); ?>><?php echo esc_html(citami_t('Sempre attivo', 'Always on')); ?></option>
                <option value="off" <?php selected($s['enabled'], 'off'); ?>><?php echo esc_html(citami_t('Disattivato', 'Off')); ?></option>
            </select>
            <code><?php echo esc_html(home_url('/sitemap.xml')); ?></code>
        </td>
    </tr>
    <tr>
        <th scope="row"><?php echo esc_html(citami_t('Esclusioni', 'Exclusions')); ?></th>
        <td class="citami-seo-checks">
            <?php foreach (citami_seo_post_types() as $type): ?>
                <label><input type="checkbox" name="<?php echo esc_attr($opt); ?>[exclude_types][]" value="<?php echo esc_attr($type); ?>" <?php checked(in_array($type, $s['exclude_types'], true)); ?>> <?php echo esc_html(sprintf(citami_t('Escludi %s', 'Exclude %s'), mb_strtolower(citami_post_type_label($type)))); ?></label>
            <?php endforeach; ?>
            <label><input type="checkbox" name="<?php echo esc_attr($opt); ?>[taxonomies]" value="off" <?php checked($s['taxonomies'], 'off'); ?>> <?php echo esc_html(citami_t('Escludi categorie e tag', 'Exclude categories and tags')); ?></label>
        </td>
    </tr>
    </table>
    </section>
    <?php
});