<?php
/**
 * PluginsHelper
 *
 * Helper class for the site's plugins.
 */

namespace Automattic\WooCommerce\Admin;

defined( 'ABSPATH' ) || exit;

if ( ! function_exists( 'get_plugins' ) ) {
	require_once ABSPATH . 'wp-admin/includes/plugin.php';
}

/**
 * Class PluginsHelper
 */
class PluginsHelper {

	/**
	 * Get the path to the plugin file relative to the plugins directory from the plugin slug.
	 *
	 * E.g. 'woocommerce' returns 'woocommerce/woocommerce.php'
	 *
	 * @param string $slug Plugin slug to get path for.
	 *
	 * @return string|false
	 */
	public static function get_plugin_path_from_slug( $slug ) {
		$plugins = get_plugins();

		if ( strstr( $slug, '/' ) ) {
			// The slug is already a plugin path.
			return $slug;
		}

		foreach ( $plugins as $plugin_path => $data ) {
			$path_parts = explode( '/', $plugin_path );
			if ( $path_parts[0] === $slug ) {
				return $plugin_path;
			}
		}

		return false;
	}

	/**
	 * Get an array of installed plugin slugs.
	 *
	 * @return array
	 */
	public static function get_installed_plugin_slugs() {
		return array_map(
			function( $plugin_path ) {
				$path_parts = explode( '/', $plugin_path );
				return $path_parts[0];
			},
			array_keys( get_plugins() )
		);
	}

	/**
	 * Get an array of installed plugins with their file paths as a key value pair.
	 *
	 * @return array
	 */
	public static function get_installed_plugins_paths() {
		$plugins           = get_plugins();
		$installed_plugins = array();

		foreach ( $plugins as $path => $plugin ) {
			$path_parts                 = explode( '/', $path );
			$slug                       = $path_parts[0];
			$installed_plugins[ $slug ] = $path;
		}

		return $installed_plugins;
	}

	/**
	 * Get an array of active plugin slugs.
	 *
	 * @return array
	 */
	public static function get_active_plugin_slugs() {
		return array_map(
			function( $plugin_path ) {
				$path_parts = explode( '/', $plugin_path );
				return $path_parts[0];
			},
			get_option( 'active_plugins', array() )
		);
	}

	/**
	 * Checks if a plugin is installed.
	 *
	 * @param string $plugin Path to the plugin file relative to the plugins directory or the plugin directory name.
	 *
	 * @return bool
	 */
	public static function is_plugin_installed( $plugin ) {
		$plugin_path = self::get_plugin_path_from_slug( $plugin );
		return $plugin_path ? array_key_exists( $plugin_path, get_plugins() ) : false;
	}

	/**
	 * Checks if a plugin is active.
	 *
	 * @param string $plugin Path to the plugin file relative to the plugins directory or the plugin directory name.
	 *
	 * @return bool
	 */
	public static function is_plugin_active( $plugin ) {
		$plugin_path = self::get_plugin_path_from_slug( $plugin );
		return $plugin_path ? in_array( $plugin_path, get_option( 'active_plugins', array() ), true ) : false;
	}

	/**
	 * Get plugin data.
	 *
	 * @param string $plugin Path to the plugin file relative to the plugins directory or the plugin directory name.
	 *
	 * @return array|false
	 */
	public static function get_plugin_data( $plugin ) {
		$plugin_path = self::get_plugin_path_from_slug( $plugin );
		$plugins     = get_plugins();

		return isset( $plugins[ $plugin_path ] ) ? $plugins[ $plugin_path ] : false;
	}

}