using System.Collections.Generic;
using ShareeBike.Model.Connector.Filter;

namespace ShareeBike.Model.User.Account
{
	public static class AccountExtensions
	{
		/// <summary> Gets information whether user is logged in or not from account object. </summary>
		/// <param name="account">Object to get information from.</param>
		/// <returns>True if user is logged in, false if not.</returns>
		public static bool GetIsLoggedIn(this IAccount account)
		{
			return !string.IsNullOrEmpty(account.Mail)
				&& !string.IsNullOrEmpty(account.SessionCookie);
		}

		/// <summary> 
		/// Filters bike groups depending on whether user has access to all groups of bikes.
		/// Some user may be "ShareeBike"- user only, some "Citybike" and some may be "ShareeBike" and "Citybike" users.
		/// </summary>
		/// <param name="account">Account to filter with.</param>
		/// <param name="filter">Groups to filter.</param>
		/// <returns>Filtered bike groups.</returns>
		public static IEnumerable<string> DoFilter(
			this IAccount account,
			IEnumerable<string> filter)
		{

			return GetIsLoggedIn(account)
				? GroupFilterFactory.Create(account.Group).DoFilter(filter) // Filter if user is logged in.
				: new NullGroupFilter().DoFilter(filter); // Do not filter if no user is logged in.
		}
	}
}