using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
using System.ComponentModel;

namespace Model
{
    /// <summary>
    /// A user is an entity with a _name, a surname, mail, profilePict and a list of priority.
    /// This user can login with an Id and a password
    /// </summary>
    [DataContract(Name = "user")]
    public class User : IEquatable<User> , INotifyPropertyChanged 
    {
        #region Private Attributes

        [DataMember] private string name="";
        [DataMember] private string surname="";
        [DataMember] private string mail = "";
        [DataMember] private string picture = "";
        [DataMember] private string password = "";
        [DataMember] private List<Priority> priorities;

        public event PropertyChangedEventHandler? PropertyChanged;
        #endregion

        #region Properties

        /// <summary>
        /// Property to get Name of users and a setter 
        /// </summary>
        /// <exception cref="ArgumentException" >Setter have Exception which is trigger when Name is null</exception>
        public string Name
        {
            get { return name; }
            set
            {
             
                name = value;
                OnPropertyChanged();
            }
        }

        /// <summary>
        /// Property to get Surname of users and a setter 
        /// </summary>
        /// <exception cref="ArgumentException" >Setter have Exception which is trigger when Surname is null</exception>
        public string Surname
        {
            get { return surname; }
            set
            {
             
                surname = value;
                OnPropertyChanged();
            }
        }

        /// <summary>
        /// Property to get mail of users and a setter 
        /// </summary>
        /// <exception cref="ArgumentException" >User's mail will serve to log the user. So there's no setter, just an init. User will enter one time his email at his
        /// account creation.</exception>
        public string Mail
        {
            get { return mail; }
            private init
            {
                if (string.IsNullOrWhiteSpace(value))
                {
                    throw new ArgumentException("Impossible d'avoir un champ Email vide!");
                }
                mail = value;
            }
        }

       public string Password
        {
            get =>  password; 
            set => password = value;
            
        }


        /// <summary>
        /// For now, we define the ProfilPict as a string which is "PhotoParDefaut"
        /// when the value is null.
        /// </summary>
        public string ProfilPict
        {
            get => picture;
            set => picture = value;
          
        }

        /// <summary>
        /// This is the list of priorities specific tu the user. This list is initiate
        /// by default. User could change it at will.
        /// </summary>
        
        public List<Priority> Priorities
        {
            get => priorities;
            set=> priorities = value;
        }

        public override bool Equals(object? other)
        {
            if (other == null) return false;
            if (other == this) return true;
            return Equals(other);
        }

        public bool Equals(User? other)
        {
            if (other == null) return false;
            return Name.Equals(other.Name) && Surname.Equals(other.Surname) && Mail.Equals(other.Mail);
        }

        public override int GetHashCode()
        {
            throw new NotImplementedException();
        }


        protected void OnPropertyChanged ([CallerMemberName] string? propertyName = null)
        {
            if (PropertyChanged != null)
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public override string ToString()
        {
            return $"{Name} {Surname}"; 
        }

        [DataMember(Name = "passmgr")]
        public IPasswordManager psswMgr { get; private set; }


        #endregion

        #region Constructors

        /// <summary>
        /// Construtors of user.
        /// </summary>
        /// <param name="name">The name of the user</param>
        /// <param name="surname">The surname of the user</param>
        /// <param name="mail">The user needs an email to login.</param>
        /// <param name="password">The password of the new user.</param>
        /// <param name="passwordManager">The password manager to manage the user password.</param>
        public User(string name, string surname, string mail, string password, IPasswordManager passwordManager)
        {
            Name = name;
            Surname = surname;
            Mail = mail;
            psswMgr = passwordManager;
            Password = psswMgr.HashPassword(password);
            priorities = new List<Priority> {
                Priority.Gourmet,
                Priority.Economic,
                Priority.Fast,
                Priority.Light,
                Priority.Easy};
            ProfilPict = picture;

        }

        /// <summary>
        /// <inheritdoc cref="User.User"/>
        /// </summary>
        public User(string name, string surname, string mail, string password)
            : this(name, surname,mail, password, new PasswordSHA256())
        {

        }

        /// <summary>
        /// <inheritdoc cref="User.User"/>
        /// </summary>
        public User()
            : this("John", "Doe", "truc@gmail.com", "mdp")
        {

        }

        /// <summary>
        /// <inheritdoc cref="User.User"/>
        /// </summary>
        public User (User user)
        {
            Name = user.Name;
            Surname = user.Surname;
            Mail = user.Mail;
            psswMgr = user.psswMgr;
            Password = user.Password;
            priorities = user.Priorities;
            ProfilPict = user.ProfilPict;
        }


        #endregion
    }
}