<?php

/**
 * The admin-specific functionality of the plugin.
 *
 * Defines the plugin name, version, and two examples hooks for how to
 * enqueue the admin-specific stylesheet and JavaScript.
 *
 * @package    Reactpress
 * @subpackage Reactpress/admin
 * @author     Marco Laspe <marco@rockiger.com>
 */

namespace ReactPress\Admin;

use LengthException;
use ReactPress\Admin\Utils;

class Controller {

  // # Controller functions 

  public static function add_page(string $appname, int $pageId, string $page_title) {
    $app_options = Utils::get_app_options($appname);
    //# Check if the app allows adding of more URL slugs
    if ($app_options && $app_options['allowsRouting'] && count($app_options['pageIds'])) {
      echo wp_json_encode([
        'status' => 0,
        'message' => 'Apps with client-side routing can only be shown on one single page.'
      ]);
      return;
    }

    // add slug to existing app_options
    $inserted_page = Controller::insert_page($pageId, $page_title);
    if (!$inserted_page['ID']) {
      echo wp_json_encode([
        'status' => 0,
        'message' => $inserted_page['message']
      ]);
      return;
    }
    $permalink = get_permalink($inserted_page['ID']);
    $permalink = $permalink ? $permalink : '';
    $app_options ? Utils::add_pageId_to_app_options($appname, $inserted_page['ID']) : Utils::add_app_options($appname, $inserted_page['ID']);
    Controller::add_build_path($appname);
    if ($app_options['allowsRouting']) {
      add_rewrite_rule('^' .  wp_make_link_relative($permalink) . '/(.*)?', 'index.php?pagename=' . wp_make_link_relative($permalink), 'top');
      Utils::set_public_url_for_dev_server($appname, $permalink);
    }
    flush_rewrite_rules();
    Controller::write_index_html($appname, Controller::get_index_html_content($permalink));
    echo wp_json_encode([
      'status' => 1,
      'message' => 'Page added.',
      'pageId' => $inserted_page['ID'],
      'page_title' => $inserted_page['page_title'],
      'permalink' => $permalink
    ]);
  }

  public static function delete_page(string $appname, int $pageId, string $permalink) {
    try {
      $app_options_list = Utils::get_apps();
      Utils::delete_page($app_options_list, $appname, $pageId);
      Utils::unset_public_url_for_dev_server($appname, $permalink);
      echo wp_json_encode(['status' => 1]);
    } catch (\Exception $e) {
      repr_log($e);
      echo wp_json_encode(['status' => 0, 'message' => $e->getMessage()]);
    }
  }

  public static function delete_react_app(string $appname) {
    $options = get_option('repr_apps');
    Utils::write_apps_option(array_filter(
      $options,
      fn ($el) => $el['appname'] !== $appname
    ));
    $is_appdir_removed = repr_delete_directory(Utils::app_path($appname));
    if ($is_appdir_removed) {
      echo wp_json_encode([
        'status' => 1,
        'message' => 'App deleted.',
      ]);
    } else {
      echo wp_json_encode([
        'status' => 1,
        'message' => "Couldn't remove files. Please remove directory by hand.",
      ]);
    }
  }

  public static function get_react_apps() {
    $apps = Utils::get_apps();
    echo wp_json_encode(['status' => 1, 'apps' => $apps]);
  }

  public static function update_index_html(string $appname, string $permalink) {
    Controller::write_index_html($appname, Controller::get_index_html_content($permalink));
    echo wp_json_encode([
      'status' => 1,
      'message' => 'Index.html updated.',
    ]);
  }

  // # Helper functions

  /**
   * Add the right build path to package.json
   *
   * @param string $appname
   * @return int 0 if no success
   * @since 1.2.0
   */
  public static function add_build_path($appname) {
    $apppath = Utils::app_path($appname);
    // We need the relative path, that we can deploy our
    // built app to another server later.
    $relative_apppath = Utils::app_path($appname, true);
    $relative_apppath = $relative_apppath ? $relative_apppath : "/wp-content/reactpress/apps/{$appname}/";
    $homepage = "{$relative_apppath}/build";
    $path_package_json = "{$apppath}/package.json";
    $package_json_contents = file_get_contents($path_package_json);
    if (!$package_json_contents) {
      return 0;
    } elseif (stripos($package_json_contents, $homepage)) {
      return 1;
    } else {
      // Add a homepage attribute during the build process and remove it again, 
      // that the developer can build with the public/index.html without WP.
      file_put_contents(
        $path_package_json,
        str_replace("react-scripts build", IS_WINDOWS ? "set PUBLIC_URL={$homepage}&&react-scripts build" : "PUBLIC_URL={$homepage} react-scripts build", $package_json_contents)
      );
      return 2;
    }
  }

  /**
   * Downloads the content of the page with the given permalink and removes the
   * the react assets of the build page, that we can use the content for our
   * development server.
   *
   * @param $permalink
   * @return string
   * @since 1.0.0
   */
  public static function get_index_html_content(string $permalink) {
    $file_contents = wp_remote_retrieve_body(
      wp_remote_get($permalink, ['timeout' => 1000])
    );
    $file_contents_arr = explode(PHP_EOL, $file_contents);
    // filter all build assets out of the file, that they don't conflict
    // with the dev assets.
    $filtered_arr = array_filter($file_contents_arr, fn ($el) => !strpos($el, "id='rp-react-app-asset-"));
    $filtered_contents =  implode(PHP_EOL, $filtered_arr);
    // re-add script tag for global reactPress variable
    $readded_contents = str_replace('var reactPress', "<script>\nvar reactPress", $filtered_contents);

    return $readded_contents;
  }

  /**
   * Creates or updates a page with the given name and title.
   *
   * @param int $pageId
   * @param string $page_title
   * @since 1.0.0
   */
  public static function insert_page(int $pageId, string $page_title) {
    if ($pageId === -1) {
      $result = wp_insert_post(
        array(
          'post_title' => $page_title,
          'post_status' => 'publish',
          'post_content' => REPR_REACT_ROOT_TAG,
          'post_type' => "page",
          // Assign page template using the relative path, it will be
          // resolved to the fully qualified name at run-time
          'page_template'  => 'templates/react-page-template.php',
        )
      );
      return $result
        ? ['status' => 'true', 'message' => 'Page created.', 'ID' => $result, 'page_title' => $page_title]
        : ['status' => 'false', 'message' => "Couldn't create page.", "ID" => $result, 'page_title' => $page_title];
    } else {
      $page = get_post($pageId);
      if ($page) {
        // already we have data with this post name
        if (strpos($page->post_content, '<div id="root"></div>') !== false) {
          return ['status' => 'true', 'message' => 'Page with app already exists.', 'ID' => $page->ID, 'page_title' => $page_title];
        }
        $result = wp_update_post(
          [
            'ID' => $page->ID,
            'post_content' => $page->post_content . '\n' . REPR_REACT_ROOT_TAG
          ]
        );
        return $result
          ? ['status' => 'true', 'message' => 'Add app to page.', 'ID' => $result, 'page_title' => $page->post_title]
          : ['status' => 'false', 'message' => 'Couldn\'t add app to page.', 'ID' => 0, 'page_title' => ''];
      }
    }
  }

  public static function toggle_react_routing(string $appname) {
    try {
      $app_options = Utils::get_apps();

      $new_options = array_map(function ($el) use ($appname) {
        if ($el['appname'] === $appname) {
          //# create new allowsRouting state
          $allowsRouting = $el['allowsRouting'] ?? false;
          $el['allowsRouting'] = !$allowsRouting;

          //# change rewrite rules in wordpress
          if ($el['allowsRouting']) {
            // routing is only allowed for one single page
            if (count($el['pages']) > 1) {
              throw new LengthException('Client-side routing is only allowed for apps with one page slug.');
            }
            foreach ($el['pages'] as $page) {
              add_rewrite_rule('^' . wp_make_link_relative($page['permalink']) . '/(.*)?', 'index.php?pagename=' . wp_make_link_relative($page['permalink']), 'top');
              Utils::set_public_url_for_dev_server($appname, $page['permalink']);
            }
            flush_rewrite_rules();
          } else {
            foreach ($el['pages'] as $page) {
              Utils::remove_rewrite_rule('^' . wp_make_link_relative($page['permalink']) . '/(.*)?');
              Utils::unset_public_url_for_dev_server($appname, $page['permalink']);
            }
            flush_rewrite_rules();
          }
          return $el;
        }
        return $el;
      }, $app_options);

      Utils::write_apps_option($new_options);
      echo wp_json_encode(['status' => 1]);
    } catch (\Exception $e) {
      repr_log($e);
      echo wp_json_encode(['status' => 0, 'message' => $e->getMessage()]);
    }
  }

  /**
   * Writes the given to the index.html file in the app directory of
   * the given appname and produces if the writing of the file succeded or not.
   *
   * @param string $appname
   * @param string $content
   * @since 1.0.0
   */
  public static function write_index_html(string $appname, string $content) {
    $index_html_path = sprintf("%s/%s/public/index.html", REPR_APPS_PATH, $appname);

    return file_put_contents($index_html_path, $content);
  }
}