<?php
namespace Zadex\Admin;

defined('ABSPATH') || exit;

use Zadex\SiteAssets\IconSets;

/**
 * "Zadex → Custom Icons" (T167): upload a Fontello / IcoMoon / Fontastic zip, list the sets with a glyph sample,
 * delete a set.
 */
final class CustomIconsPage
{
    public const SLUG = 'zadex-custom-icons';
    public const ACTION_IMPORT = 'zadex_icons_import';
    public const ACTION_DELETE = 'zadex_icons_delete';
    public const MAX_UPLOAD = 20 * 1024 * 1024;

    private IconSets $icons;
    private string $hook = '';

    public function __construct(IconSets $icons)
    {
        $this->icons = $icons;
    }

    public function register(): void
    {
        add_action('admin_menu', [$this, 'menu'], 20);
        add_action('admin_enqueue_scripts', [$this, 'assets']);
        add_action('admin_post_' . self::ACTION_IMPORT, [$this, 'import']);
        add_action('admin_post_' . self::ACTION_DELETE, [$this, 'delete']);
    }

    public static function url(array $args = []): string
    {
        return add_query_arg(['page' => self::SLUG] + $args, admin_url('admin.php'));
    }

    public function menu(): void
    {
        $this->hook = (string) add_submenu_page('zadex', __('Custom Icons', 'zadex'), __('Custom Icons', 'zadex'), IconSets::CAPABILITY, self::SLUG, [$this, 'render']);
    }

    public function assets(string $hook): void
    {
        if ($hook !== $this->hook) {
            return;
        }
        foreach ($this->icons->all() as $set) {
            wp_enqueue_style(IconSets::handle((string) $set['slug']), $this->icons->style_url($set), [], (string) ($set['version'] ?? ZADEX_VERSION));
        }
    }

    /** @return string|\WP_Error path of the uploaded zip */
    public static function validate_upload($file)
    {
        if (!is_array($file) || !isset($file['tmp_name'], $file['name'], $file['error']) || (int) $file['error'] !== 0) {
            return new \WP_Error('zadex_no_file', __('Choose an icon set (.zip) to upload.', 'zadex'));
        }
        if (strtolower(pathinfo((string) $file['name'], PATHINFO_EXTENSION)) !== 'zip') {
            return new \WP_Error('zadex_bad_type', __('Icon sets are uploaded as a .zip file.', 'zadex'));
        }
        $size = (int) ($file['size'] ?? 0);
        $tmp = (string) $file['tmp_name'];
        if ($size <= 0 || $size > self::MAX_UPLOAD || !is_file($tmp) || (function_exists('is_uploaded_file') && !is_uploaded_file($tmp))) {
            return new \WP_Error('zadex_bad_type', __('The file is empty or too large.', 'zadex'));
        }
        return $tmp;
    }

    /** admin-post.php: import an icon-set zip (capability + nonce first, then the sanitized upload entry). */
    public function import(): void
    {
        if (!current_user_can(IconSets::CAPABILITY)) {
            wp_die(esc_html__('You are not allowed to manage icon sets.', 'zadex'), 403);
        }
        check_admin_referer(self::ACTION_IMPORT);
        $label = isset($_POST['label']) ? sanitize_text_field(wp_unslash($_POST['label'])) : '';
        $tmp = self::validate_upload(UploadedFile::from_request('icon_zip', self::ACTION_IMPORT));
        $result = is_wp_error($tmp) ? $tmp : $this->icons->import($tmp, $label);
        if (is_wp_error($result)) {
            Notices::add(self::SLUG, $result->get_error_message(), 'error', 'icons-error');
        } else {
            Notices::add(self::SLUG, __('Icon set imported. It is now available in the icon picker of the Zadex editor.', 'zadex'), 'success', 'icons-imported');
        }
        wp_safe_redirect(self::url());
        exit;
    }

    /** admin-post.php: delete an icon set. */
    public function delete(): void
    {
        if (!current_user_can(IconSets::CAPABILITY)) {
            wp_die(esc_html__('You are not allowed to manage icon sets.', 'zadex'), 403);
        }
        check_admin_referer(self::ACTION_DELETE);
        $this->icons->delete(isset($_GET['set']) ? sanitize_key(wp_unslash($_GET['set'])) : '');
        Notices::add(self::SLUG, __('Icon set deleted.', 'zadex'));
        wp_safe_redirect(self::url());
        exit;
    }

    public function render(): void
    {
        if (!current_user_can(IconSets::CAPABILITY)) {
            return;
        }
        $sets = $this->icons->all();
        ?>
<div class="wrap zadex-custom-icons">
  <h1><?php esc_html_e('Custom Icons', 'zadex'); ?></h1>
  <?php Notices::render(self::SLUG); ?>
  <p class="description"><?php esc_html_e('Upload the zip exported by Fontello, IcoMoon or Fontastic. Only the font files and the icon list are used.', 'zadex'); ?></p>
  <form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>" enctype="multipart/form-data" style="display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:12px 0">
    <input type="hidden" name="action" value="<?php echo esc_attr(self::ACTION_IMPORT); ?>">
    <?php wp_nonce_field(self::ACTION_IMPORT); ?>
    <label for="zx-icons-label" class="screen-reader-text"><?php esc_html_e('Name', 'zadex'); ?></label>
    <input id="zx-icons-label" name="label" type="text" class="regular-text" placeholder="<?php esc_attr_e('Name (optional)', 'zadex'); ?>">
    <input name="icon_zip" type="file" accept=".zip,application/zip" required data-testid="icons-file">
    <?php submit_button(__('Upload icon set', 'zadex'), 'primary', 'submit', false); ?>
  </form>
  <table class="widefat striped">
    <thead><tr><th><?php esc_html_e('Name', 'zadex'); ?></th><th><?php esc_html_e('Source', 'zadex'); ?></th><th><?php esc_html_e('Icons', 'zadex'); ?></th><th><?php esc_html_e('Preview', 'zadex'); ?></th><th></th></tr></thead>
    <tbody>
    <?php if (!$sets) : ?><tr><td colspan="5"><?php esc_html_e('No custom icon sets yet.', 'zadex'); ?></td></tr><?php endif; ?>
    <?php foreach ($sets as $set) :
        $prefix = IconSets::PREFIX . $set['slug']; ?>
      <tr data-testid="icon-set-row">
        <td><strong><?php echo esc_html((string) $set['label']); ?></strong><br><code><?php echo esc_html($prefix); ?></code></td>
        <td><?php echo esc_html(ucfirst((string) $set['format'])); ?></td>
        <td><?php echo (int) $set['count']; ?></td>
        <td style="font-size:20px;letter-spacing:6px"><?php foreach (array_slice((array) $set['icons'], 0, 16) as $name) : ?><i class="<?php echo esc_attr($prefix . ' ' . $prefix . '-' . $name); ?>" title="<?php echo esc_attr($name); ?>"></i><?php endforeach; ?></td>
        <td><a class="submitdelete" href="<?php echo esc_url(wp_nonce_url(add_query_arg(['action' => self::ACTION_DELETE, 'set' => $set['slug']], admin_url('admin-post.php')), self::ACTION_DELETE)); ?>" data-zadex-confirm="<?php esc_attr_e('Delete this icon set? Icons using it will disappear from the site.', 'zadex'); ?>"><?php esc_html_e('Delete', 'zadex'); ?></a></td>
      </tr>
    <?php endforeach; ?>
    </tbody>
  </table>
</div>
        <?php
    }
}