<?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) — OPEN GRAPH / TWITTER CARDS                          */
/*  Per-post overrides (title, description, image) with sensible       */
/*  fallbacks: SEO title/description, featured image, default image,   */
/*  entity logo. Same deference as the meta module.                    */
/* ────────────────────────────────────────────────────────────────── */

define('CITAMI_SOCIAL_SETTINGS_OPT', 'citami_social_settings');
define('CITAMI_META_OG_TITLE', '_citami_og_title');
define('CITAMI_META_OG_DESC', '_citami_og_description');
define('CITAMI_META_OG_IMAGE', '_citami_og_image');

function citami_social_settings() {
    $d = array('enabled' => 'on', 'default_image' => '', 'twitter_site' => '', 'facebook_app_id' => '');
    $s = get_option(CITAMI_SOCIAL_SETTINGS_OPT, array());
    if (is_array($s)) {
        foreach ($d as $k => $v) {
            if (isset($s[$k]) && is_string($s[$k])) {
                $d[$k] = $s[$k];
            }
        }
    }
    return $d;
}

function citami_sanitize_social_settings($value) {
    $in = is_array($value) ? $value : array();
    $img = isset($in['default_image']) ? trim((string) $in['default_image']) : '';
    $tw = isset($in['twitter_site']) ? trim((string) $in['twitter_site']) : '';
    $tw = $tw === '' ? '' : '@' . preg_replace('/[^A-Za-z0-9_]/', '', ltrim($tw, '@'));
    return array(
        'enabled'         => (isset($in['enabled']) && $in['enabled'] === 'off') ? 'off' : 'on',
        'default_image'   => preg_match('#^https?://#i', $img) ? esc_url_raw($img) : '',
        'twitter_site'    => $tw === '@' ? '' : $tw,
        'facebook_app_id' => isset($in['facebook_app_id']) ? preg_replace('/\D/', '', (string) $in['facebook_app_id']) : '',
    );
}

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

function citami_social_get_post_fields($post_id) {
    return array(
        'og_title'       => (string) get_post_meta($post_id, CITAMI_META_OG_TITLE, true),
        'og_description' => (string) get_post_meta($post_id, CITAMI_META_OG_DESC, true),
        'og_image'       => (string) get_post_meta($post_id, CITAMI_META_OG_IMAGE, true),
    );
}

function citami_social_save_post_fields($post_id, array $fields) {
    if (array_key_exists('og_title', $fields)) {
        update_post_meta($post_id, CITAMI_META_OG_TITLE, mb_substr(citami_seo_sanitize_template($fields['og_title']), 0, 200));
    }
    if (array_key_exists('og_description', $fields)) {
        update_post_meta($post_id, CITAMI_META_OG_DESC, mb_substr(citami_seo_sanitize_template($fields['og_description']), 0, 320));
    }
    if (array_key_exists('og_image', $fields)) {
        $img = trim((string) $fields['og_image']);
        update_post_meta($post_id, CITAMI_META_OG_IMAGE, preg_match('#^https?://#i', $img) ? esc_url_raw($img) : '');
    }
    return citami_social_get_post_fields($post_id);
}

/** Image for the current context: override → featured → default → entity logo. */
function citami_social_image($ctx) {
    if (!empty($ctx['post'])) {
        $custom = (string) get_post_meta($ctx['post']->ID, CITAMI_META_OG_IMAGE, true);
        if ($custom !== '') {
            return $custom;
        }
        $featured = citami_schema_featured_image($ctx['post']);
        if ($featured !== '') {
            return $featured;
        }
    }
    $s = citami_social_settings();
    if ($s['default_image'] !== '') {
        return $s['default_image'];
    }
    $entity = citami_schema_settings()['entity'];
    return $entity['logo'] !== '' ? $entity['logo'] : '';
}

/** [name/property, content] pairs for the current request. */
function citami_social_tags($ctx = null) {
    $ctx = $ctx === null ? citami_seo_context() : $ctx;
    if ($ctx['kind'] === '404' || $ctx['kind'] === 'search') {
        return array();
    }
    $s = citami_social_settings();
    $title = citami_seo_title($ctx);
    if ($title === null || $title === '') {
        $title = get_bloginfo('name');
    }
    $desc = citami_seo_description($ctx);
    $url = citami_seo_canonical($ctx);
    $type = 'website';
    if (!empty($ctx['post'])) {
        $f = citami_social_get_post_fields($ctx['post']->ID);
        if ($f['og_title'] !== '') {
            $title = citami_seo_render_template($f['og_title'], citami_seo_vars($ctx));
        }
        if ($f['og_description'] !== '') {
            $desc = citami_seo_render_template($f['og_description'], citami_seo_vars($ctx));
        }
        if ($ctx['kind'] === 'singular' && $ctx['post']->post_type === 'post') {
            $type = 'article';
        }
    }
    $image = citami_social_image($ctx);
    $tags = array(
        array('property', 'og:type', $type),
        array('property', 'og:title', $title),
        array('property', 'og:site_name', get_bloginfo('name')),
        array('property', 'og:locale', str_replace('-', '_', (string) get_locale())),
    );
    if ($desc !== '') {
        $tags[] = array('property', 'og:description', $desc);
    }
    if ($url !== '') {
        $tags[] = array('property', 'og:url', $url);
    }
    if ($image !== '') {
        $tags[] = array('property', 'og:image', $image);
    }
    if ($type === 'article' && !empty($ctx['post'])) {
        if (!empty($ctx['post']->post_date)) {
            $tags[] = array('property', 'article:published_time', citami_schema_iso_date($ctx['post']->post_date));
        }
        if (!empty($ctx['post']->post_modified)) {
            $tags[] = array('property', 'article:modified_time', citami_schema_iso_date($ctx['post']->post_modified));
        }
    }
    if ($s['facebook_app_id'] !== '') {
        $tags[] = array('property', 'fb:app_id', $s['facebook_app_id']);
    }
    $tags[] = array('name', 'twitter:card', $image !== '' ? 'summary_large_image' : 'summary');
    $tags[] = array('name', 'twitter:title', $title);
    if ($desc !== '') {
        $tags[] = array('name', 'twitter:description', $desc);
    }
    if ($image !== '') {
        $tags[] = array('name', 'twitter:image', $image);
    }
    if ($s['twitter_site'] !== '') {
        $tags[] = array('name', 'twitter:site', $s['twitter_site']);
    }
    return $tags;
}

function citami_social_print_head() {
    if (!citami_seo_enabled() || citami_social_settings()['enabled'] !== 'on') {
        return;
    }
    foreach (citami_social_tags() as $t) {
        $attr = $t[0] === 'property' ? 'property' : 'name';
        echo '<meta ' . esc_attr($attr) . '="' . esc_attr($t[1]) . '" content="' . esc_attr($t[2]) . '" />' . "\n";
    }
}
add_action('wp_head', 'citami_social_print_head', 2);

add_action('citami_seo_meta_box_fields', function ($post) {
    $f = citami_social_get_post_fields($post->ID);
    ?>
    <p>
        <strong>Social (Open Graph / X)</strong><br>
        <input type="text" name="citami_seo[og_title]" class="widefat" maxlength="200" value="<?php echo esc_attr($f['og_title']); ?>" placeholder="<?php echo esc_attr(citami_t('Titolo social (default: titolo SEO)', 'Social title (default: SEO title)')); ?>">
        <textarea name="citami_seo[og_description]" class="widefat" rows="2" maxlength="320" placeholder="<?php echo esc_attr(citami_t('Descrizione social (default: meta description)', 'Social description (default: meta description)')); ?>"><?php echo esc_textarea($f['og_description']); ?></textarea>
        <input type="url" name="citami_seo[og_image]" class="widefat" value="<?php echo esc_attr($f['og_image']); ?>" placeholder="<?php echo esc_attr(citami_t('URL immagine social (default: immagine in evidenza)', 'Social image URL (default: featured image)')); ?>">
    </p>
    <?php
});

add_action('citami_seo_save_extra', function ($post_id, $in) {
    citami_social_save_post_fields($post_id, array(
        'og_title'       => isset($in['og_title']) ? $in['og_title'] : '',
        'og_description' => isset($in['og_description']) ? $in['og_description'] : '',
        'og_image'       => isset($in['og_image']) ? $in['og_image'] : '',
    ));
}, 10, 2);

add_action('citami_seo_settings_rows', function () {
    $s = citami_social_settings();
    $opt = CITAMI_SOCIAL_SETTINGS_OPT;
    ?>
    <?php citami_seo_card_head('social', 'Social', citami_t('Come appaiono i link del sito condivisi su Facebook, LinkedIn, X e nelle chat.', 'How the site\'s links look when shared on Facebook, LinkedIn, X and in chats.')); ?>
    <table class="form-table" role="presentation">
    <tr>
        <th scope="row">Open Graph / X</th>
        <td>
            <select name="<?php echo esc_attr($opt); ?>[enabled]">
                <option value="on" <?php selected($s['enabled'], 'on'); ?>><?php echo esc_html(citami_t('Attivo', 'On')); ?></option>
                <option value="off" <?php selected($s['enabled'], 'off'); ?>><?php echo esc_html(citami_t('Disattivato', 'Off')); ?></option>
            </select>
        </td>
    </tr>
    <tr>
        <th scope="row"><?php echo esc_html(citami_t('Immagine di default', 'Default image')); ?></th>
        <td>
            <input type="url" name="<?php echo esc_attr($opt); ?>[default_image]" value="<?php echo esc_attr($s['default_image']); ?>" placeholder="<?php echo esc_attr(citami_t('Immagine di default (URL)', 'Default image (URL)')); ?>" class="regular-text">
            <p class="description"><?php echo esc_html(citami_t('Usata per le pagine senza immagine in evidenza.', 'Used for pages without a featured image.')); ?></p>
        </td>
    </tr>
    <tr>
        <th scope="row"><?php echo esc_html(citami_t('Account', 'Accounts')); ?></th>
        <td class="citami-seo-inline">
            <input type="text" name="<?php echo esc_attr($opt); ?>[twitter_site]" value="<?php echo esc_attr($s['twitter_site']); ?>" placeholder="@account" size="14">
            <input type="text" name="<?php echo esc_attr($opt); ?>[facebook_app_id]" value="<?php echo esc_attr($s['facebook_app_id']); ?>" placeholder="fb:app_id" size="14">
        </td>
    </tr>
    </table>
    </section>
    <?php
});