using System.Text;
using Femto.Common.Domain;
using Femto.Modules.Authentication.Contracts;
using Femto.Modules.Authentication.Models.Events;
using Geralt;

namespace Femto.Modules.Authentication.Models;

internal class UserIdentity : Entity
{
    public Guid Id { get; private set; }
    
    public string Username { get; private set; }
    
    public UserPassword Password { get; private set; }

    private UserIdentity()
    {
        
    }

    public UserIdentity(string username)
    {
        this.Id = Guid.CreateVersion7();
        this.Username = username;
        
        this.AddDomainEvent(new UserWasCreatedEvent(this));
    }

    public UserIdentity WithPassword(string password)
    {
        this.SetPassword(password);
        return this;
    }

    public void SetPassword(string password)
    {
        var hash = new byte[128];
        try
        {
            Argon2id.ComputeHash(hash, Encoding.UTF8.GetBytes(password), 3, 67108864);
        }
        catch (Exception e)
        {
            throw new SetPasswordError("Failed to hash password", e);
        }
        
        this.Password = new UserPassword(this.Id, hash, new byte[128]);
    }
}

public class SetPasswordError(string message, Exception inner) : DomainException(message, inner);