using System;
using System.Collections.Generic;
using System.Linq;

namespace TINK.Model.User.Account
{
    /// <summary> Specifies extra user permissions. </summary>
    [Flags]
    public enum Permissions
    {
        None = 0, // No extra permissions.
        PickCopriServer = 2, // Allows user to switch COPRI server.
        ManageCopriCacheExpiration = 4, // Allows to manage the livetime of COPRI cache entries.
        ManagePolling = 8, // Turn polling off or on and set pollig frequency.
        PickLockServiceImplementation = 16, // Allows to pick the implementation which controls bluetooth lock mangement.
        PickLocationServiceImplementation = 32, // Allows to pick the implementation which gets location information.
        PickLoggingLevel = 64, // Allows to select the logging level.
        ShowDiagnostics = 128, // Turns on display of diagnostics.
        SwitchNoSiteCaching = 1024, // Allows to turn off/ on caching of  sites displayed in app hosted by COPRI
        ReportLevel = 2048, // Allows extent to show error messages.
        All = PickCopriServer +
            ManageCopriCacheExpiration +
            ManagePolling +
            PickLockServiceImplementation +
            PickLocationServiceImplementation +
            PickLoggingLevel +
            ShowDiagnostics +
            SwitchNoSiteCaching +
            ReportLevel,
    }

    /// <summary>
    /// Specifies parts of account data. 
    /// </summary>
    /// <remarks>
    /// Usage: Account can be valid (user and password set) partly valid or completely invalid.
    /// </remarks>
    [Flags]
    public enum Elements
    {
        None = 0,
        Mail = 1,
        Password = 2,
        Account = Mail + Password
    }

    /// <summary>
    /// Holds account data.
    /// </summary>
    public class Account : IAccount
    {
        /// <summary> Constructs an account object.</summary>
        /// <param name="mail">Mail address of the account holder.</param>
        /// <param name="password">Password.</param>
        /// <param name="sessionCookie">Session cookie from copri.</param>
        /// <param name="bikeGroup">Group holdig info about Group (TINK, Konrad, ...)</param>
        /// <param name="p_iDebugLevel">Flag which controls display of debug settings.</param>
        public Account(
            string mail, 
            string password, 
            string sessionCookie,
            IEnumerable<string> bikeGroup,
            Permissions debugLevel = Permissions.None)
        {
            Mail = mail;
            Pwd = password;
            SessionCookie = sessionCookie;
            DebugLevel = debugLevel;
            Group = bikeGroup != null
                ? new HashSet<string>(bikeGroup).ToList() 
                : throw new ArgumentException("Can not instantiate account object. Reference to group list must not be empty.");
        }

        public Account(IAccount p_oSource) : this(p_oSource?.Mail, p_oSource?.Pwd, p_oSource?.SessionCookie, p_oSource?.Group, p_oSource?.DebugLevel ?? Permissions.None)
        {
        }

        /// <summary>Mail address of the account holder.</summary>
        public string Mail { get; }

        /// <summary>Password of to authenticate.</summary>
        public string Pwd { get; }

        /// <summary>Session cookie used to sign in to copri.</summary>
        public string SessionCookie { get; }

        /// <summary>Debug level used to determine which features are available.</summary>
        public Permissions DebugLevel { get; }

        /// <summary> Holds the group of the bike (TINK, Konrad, ...).</summary>
        public IEnumerable<string> Group { get; }
    }
}