using System;
using System.Reactive;
using System.Threading.Tasks;
using AutoCatCore.Services.Api;
using AutoCatCore.Services.Storage;
using ReactiveUI;
using MsBox.Avalonia;
using MsBox.Avalonia.Dto;
using MsBox.Avalonia.Enums;

namespace AutoCat.ViewModels;

public class AuthWindowViewModel: ViewModelBase
{
    #region Dependencies

    private readonly IApiService _apiService;
    private readonly IStorageService _storageService;

    #endregion
    
    #region Fields

    private string _email = "";
    private string _password = "";

    #endregion

    #region Properties

    public string Email
    {
        get => _email;
        set => this.RaiseAndSetIfChanged(ref _email, value);
    }

    public string Password
    {
        get => _password;
        set => this.RaiseAndSetIfChanged(ref _password, value);
    }

    #endregion

    #region Commands

    public ReactiveCommand<Unit, Unit> LoginCommand { get; }

    #endregion

    #region Events

    public event EventHandler? ReplaceWithMainWindowEvent;

    #endregion

    public AuthWindowViewModel(IApiService apiService, IStorageService storageService)
    {
        _apiService = apiService;
        _storageService = storageService;

        var loginEnabled = this.WhenAnyValue(
            vm => vm.Email, 
            vm => vm.Password,
            (login, password) => login.Length > 3 && password.Length > 3);

        LoginCommand = ReactiveCommand.CreateFromTask(Login, loginEnabled);
        LoginCommand.ThrownExceptions.Subscribe(ShowError);
    }

    private async Task Login()
    {
        var user = await _apiService.Login(Email, Password);
        await _storageService.SetUser(user);
        ReplaceWithMainWindowEvent?.Invoke(this, EventArgs.Empty);
    }

    private async void ShowError(Exception error)
    {
        var msgBox = MessageBoxManager.GetMessageBoxStandard(new MessageBoxStandardParams
        {
            ButtonDefinitions = ButtonEnum.Ok,
            ContentTitle = "Error",
            ContentMessage = error.Message
        });

        await msgBox.ShowAsync();
    }
}