<?php

namespace NinjaTables\App\Services;

class BackgroundInstaller
{
    public function install($plugin)
    {
        if ( ! empty($plugin['repo-slug'])) {
            require_once ABSPATH . 'wp-admin/includes/file.php';
            require_once ABSPATH . 'wp-admin/includes/plugin-install.php';
            require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
            require_once ABSPATH . 'wp-admin/includes/plugin.php';

            WP_Filesystem();

            $upgrader          = new PluginInstaller(new AutomaticUpgrader());
            $installed_plugins = array_reduce(array_keys(\get_plugins()), array($this, 'associatePluginFile'), array());
            $plugin_slug       = $plugin['repo-slug'];
            $plugin_file       = isset($plugin['file']) ? $plugin['file'] : $plugin_slug . '.php';
            $plugin_dir_url      = $plugin_slug . '/' . $plugin_file;
            $installed         = false;
            $activate          = false;

            // See if the plugin is installed already.
            if (isset($installed_plugins[$plugin_dir_url])) {
                $installed = true;
                $activate  = ! is_plugin_active($plugin_file);
            }

            // Install this thing!
            if ( ! $installed) {
                // Suppress feedback.
                ob_start();

                try {
                    $plugin_information = plugins_api(
                        'plugin_information',
                        array(
                            'slug'   => $plugin_slug,
                            'fields' => array(
                                'short_description' => false,
                                'sections'          => false,
                                'requires'          => false,
                                'rating'            => false,
                                'ratings'           => false,
                                'downloaded'        => false,
                                'last_updated'      => false,
                                'added'             => false,
                                'tags'              => false,
                                'homepage'          => false,
                                'donate_link'       => false,
                                'author_profile'    => false,
                                'author'            => false,
                            ),
                        )
                    );

                    if (is_wp_error($plugin_information)) {
                        throw new \Exception($plugin_information->get_error_message());
                    }

                    $package  = $plugin_information->download_link;
                    $download = $upgrader->download_package($package);

                    if (is_wp_error($download)) {
                        throw new \Exception($download->get_error_message());
                    }

                    $working_dir = $upgrader->unpack_package($download, true);

                    if (is_wp_error($working_dir)) {
                        throw new \Exception($working_dir->get_error_message());
                    }

                    $result = $upgrader->install_package(
                        array(
                            'source'                      => $working_dir,
                            'destination'                 => WP_PLUGIN_DIR,
                            'clear_destination'           => false,
                            'abort_if_destination_exists' => false,
                            'clear_working'               => true,
                            'hook_extra'                  => array(
                                'type'   => 'plugin',
                                'action' => 'install',
                            ),
                        )
                    );

                    if (is_wp_error($result)) {
                        throw new \Exception($result->get_error_message());
                    }

                    $activate = true;
                } catch (\Exception $e) {
                }

                // Discard feedback.
                ob_end_clean();
            }

            wp_clean_plugins_cache();

            // Activate this thing.
            if ($activate) {
                try {
                    $result = activate_plugin($installed ? $installed_plugins[$plugin_dir_url] : $plugin_dir_url);

                    if (is_wp_error($result)) {
                        throw new \Exception($result->get_error_message());
                    }
                } catch (\Exception $e) {
                }
            }
        }
    }

    private function associatePluginFile($plugins, $key)
    {
        $path               = explode('/', $key);
        $filename           = end($path);
        $plugins[$key] = $key;

        return $plugins;
    }
}