<?php

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

if (class_exists('Pausera')) return;

class Pausera {
  private $options;

  public function __construct() {
    $defaults = [
      'enable_maintenance' => false,
      'excluded_slugs'     => [],
      'excluded_ips'       => [],
      'excluded_roles'     => [],
      'allowed_users'      => [],
      'redirect_url'       => '/maintenance',
    ];

    $saved_options = get_option('pausera_settings', []);
    $this->options = wp_parse_args($saved_options, $defaults);

    add_action('admin_menu',        [$this, 'admin_menu']);
    add_action('admin_init',        [$this, 'register_settings']);
    add_action('template_redirect', [$this, 'handle_redirect']);
    add_action('admin_notices',     [$this, 'admin_notice']);
    add_action('admin_bar_menu',    [$this, 'add_admin_bar_status'], 100);
  }

  public function register_settings() {
    register_setting('pausera_group', 'pausera_settings', [
      'sanitize_callback' => [$this, 'sanitize_settings']
    ]);
  }

  public function sanitize_settings($input) {
    add_option('pausera_settings_saved', 1);
    return [
      'enable_maintenance' => !empty($input['enable_maintenance']),
      'excluded_slugs'     => isset($input['excluded_slugs']) ? array_filter(array_map('sanitize_title', (array) $input['excluded_slugs'])) : [],
      'excluded_ips'       => array_filter(array_map('trim', explode(',', sanitize_text_field($input['excluded_ips'] ?? '')))),
      'excluded_roles'     => isset($input['excluded_roles']) ? array_filter(array_map('sanitize_text_field', (array) $input['excluded_roles'])) : [],
      'redirect_url'       => esc_url_raw($input['redirect_url'] ?? '/maintenance'),
      'allowed_users' => isset($input['allowed_users']) ? array_filter(array_map('sanitize_user', (array) $input['allowed_users'])) : [],

    ];
  }

  public function admin_notice() {
    if (get_option('pausera_settings_saved')) {
      delete_option('pausera_settings_saved');
      echo '<div class="notice notice-success is-dismissible"><p>Settings saved successfully.</p></div>';
    }
  }

  public function admin_menu() {
    add_menu_page(
      'Pausera',
      'Pausera',
      'manage_options',
      'pausera',
      [$this, 'settings_page'],
      'dashicons-shield-alt',
      80
    );
  }

  public function handle_redirect() {
    if (empty($this->options['enable_maintenance'])) return;

    if (is_user_logged_in()) {
      $user = wp_get_current_user();
      if (in_array($user->user_login, $this->options['allowed_users'] ?? [])) return;

      foreach ($user->roles as $role) {
        if (in_array($role, $this->options['excluded_roles'])) return;
      }
    }

    if (in_array($_SERVER['REMOTE_ADDR'], $this->options['excluded_ips'])) return;

    global $wp_query;
    if (!$this->options['enable_maintenance'] && $wp_query->is_404()) return;

    $current_path  = trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH), '/');
    $redirect_path = trim($this->options['redirect_url'], '/');

    if ($current_path === $redirect_path) return;

    foreach ($this->options['excluded_slugs'] as $slug) {
      if (stripos($current_path, $slug) !== false) return;
    }

    if (!is_admin()) {
      wp_redirect(home_url($this->options['redirect_url']));
      exit;
    }
  }

  public function settings_page() {
    do_action('pausera_render_ui');
  }

  public function add_admin_bar_status($wp_admin_bar) {
    if (!current_user_can('manage_options')) return;

    $enabled = !empty($this->options['enable_maintenance']);
    $label   = 'Pausera: ' . ($enabled ? 'ON' : 'OFF');
    $color   = $enabled ? 'orange' : '#999';

    $wp_admin_bar->add_node([
      'id'    => 'pausera_status',
      'title' => '<span style="color:' . esc_attr($color) . '; font-weight: bold;">' . esc_html($label) . '</span>',
      'href'  => admin_url('admin.php?page=pausera'),
      'meta'  => ['title' => 'Pausera Status']
    ]);
  }
}