EmptyMauiApp/MauiApp/ViewModels/LoginPageViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using MauiApp.Core.Business.Contracts;

namespace MauiApp.ViewModels;

public partial class LoginPageViewModel(IAccountService accountService) : BasePageViewModel
{
    [ObservableProperty] private string _username;
    [ObservableProperty] private string _password;

    [ObservableProperty] private string _loginErrorMessage;


    private readonly IAccountService _accountService = accountService;


    public override async Task Initialize()
    {
        await base.Initialize();
    }


    [RelayCommand]
    private async Task Login()
    {
        if (!Validate())
            return;

        IsBusy = true;

        try
        {
            await accountService.Login(Username, Password);
            await NavigationService.NavigateAsync<MainPage>(clearStack: true);
        }
        catch (Exception ex)
        {
            LoginErrorMessage = ex.Message;
        }

        IsBusy = false;
    }


    private bool Validate()
    {
        var hasEmailError = string.IsNullOrWhiteSpace(Username);
        var hasPasswordError = string.IsNullOrWhiteSpace(Password);

        if (hasEmailError)
        {
            LoginErrorMessage = "Username non valido";
            return false;
        }

        if (hasPasswordError)
        {
            LoginErrorMessage = "Password non valida";
            return false;
        }


        return true;
    }
}