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<?php

if ( ! defined( 'ABSPATH' ) ) {
	die( 'You are not allowed to call this page directly.' );
}

/**
 * @since 3.0
 */
class FrmProInstallPlugin {

protected $plugin_file; // format: folder/filename.php
	protected $plugin_slug;

public function __construct( $atts ) {
		$this->plugin_file = $atts['plugin_file'];
		list( $slug, $file ) = explode( '/', $this->plugin_file );
		$this->plugin_slug = $slug;
	}

public function maybe_install_and_activate() {
		if ( $this->is_installed() && $this->is_active() ) {
			return;
		}

if ( $this->is_installed() ) {
			$this->activate_plugin();
		} else {
			$this->install_plugin();
		}
	}

public function is_installed() {
		return is_dir( WP_PLUGIN_DIR . '/' . $this->plugin_slug );
	}

public function is_active() {
		return is_plugin_active( $this->plugin_file );
	}

protected function install_url() {
		return wp_nonce_url( self_admin_url( 'update.php?action=install-plugin&plugin=' . $this->plugin_slug ), 'install-plugin_' . $this->plugin_slug );
	}

protected function activate_url() {
		return wp_nonce_url( self_admin_url( 'plugins.php?action=activate&plugin=' . $this->plugin_file ), 'activate-plugin_' . $this->plugin_file );
	}

protected function install_plugin() {
		if ( ! current_user_can( 'install_plugins' ) ) {
			return;
		}

include_once( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
		include_once( ABSPATH . 'wp-admin/includes/plugin-install.php' );

$api = plugins_api(
			'plugin_information',
			array(
				'slug'   => $this->plugin_slug,
				'fields' => array(
					'short_description' => false,
					'sections'          => false,
					'requires'          => false,
					'rating'            => false,
					'ratings'           => false,
					'downloaded'        => false,
					'last_updated'      => false,
					'added'             => false,
					'tags'              => false,
					'compatibility'     => false,
					'homepage'          => false,
					'donate_link'       => false,
				),
			)
		);

if ( is_wp_error( $api ) ) {
			return;
		}

$skin     = new WP_Ajax_Upgrader_Skin();
		$upgrader = new Plugin_Upgrader( $skin );
		$result   = $upgrader->install( $api->download_link );

if ( is_wp_error( $result ) || is_wp_error( $skin->result ) || is_null( $result ) ) {
			return;
		}

$this->activate_plugin();
	}

public function activate_plugin() {
		if ( ! $this->is_active() ) {
			$active = get_option( 'active_plugins', array() );
			$active[] = $this->plugin_file;
			sort( $active );
			update_option( 'active_plugins', $active );
		}
	}
}