using System;
using System.Threading;
using System.Threading.Tasks;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using SpotXInstaller.Models;
using SpotXInstaller.Services;

namespace SpotXInstaller.ViewModels;

public partial class MainViewModel : ViewModelBase
{
    private readonly InstallerService _installer = new();
    private CancellationTokenSource? _cts;

    // --- СОСТОЯНИЯ ЭКРАНОВ ---
    [ObservableProperty] private bool _isStepLoading = true;
    [ObservableProperty] private bool _isStepHome;
    [ObservableProperty] private bool _isStepSettings;
    [ObservableProperty] private bool _isStepProgress;

    // --- POPUP ---
    [ObservableProperty] private bool _showPopup;
    [ObservableProperty] private string _popupTitle = "";
    [ObservableProperty] private string _popupMessage = "";
    [ObservableProperty] private string _popupColor = "#8B5CF6";

    // --- ГАЛОЧКИ ---
    [ObservableProperty] private bool _blockUpdates = true;
    [ObservableProperty] private bool _hidePodcasts = true;
    [ObservableProperty] private bool _hidePremium = true;
    [ObservableProperty] private bool _clearCache;

    // --- ПРОГРЕСС ---
    [ObservableProperty] private double _progressValue;
    [ObservableProperty] private string _progressStatus = "Подготовка...";
    [ObservableProperty] private string _miniLog = "";

    public MainViewModel() => _ = BootAsync();

    private async Task BootAsync()
    {
        await Task.Delay(3000);
        SwitchTo(home: true);
    }

    private void SwitchTo(bool loading = false, bool home = false, bool settings = false, bool progress = false)
    {
        IsStepLoading = loading;
        IsStepHome = home;
        IsStepSettings = settings;
        IsStepProgress = progress;
    }

    [RelayCommand] private void GoToSettings() => SwitchTo(settings: true);
    [RelayCommand] private void GoBackToHome() => SwitchTo(home: true);
    [RelayCommand] private void ClosePopup() => ShowPopup = false;

    [RelayCommand]
    private async Task StartInstallAsync()
    {
        await RunInstallerAsync(isUninstall: false);
    }

    [RelayCommand]
    private async Task StartUninstallAsync()
    {
        await RunInstallerAsync(isUninstall: true);
    }

    private async Task RunInstallerAsync(bool isUninstall)
    {
        ProgressValue = 0;
        MiniLog = "";
        ProgressStatus = isUninstall ? "Подготовка восстановления..." : "Подготовка установки...";
        SwitchTo(progress: true);

        _cts?.Dispose();
        _cts = new CancellationTokenSource();

        var progress = new Progress<(int Percent, string Status)>(p =>
        {
            ProgressValue = p.Percent;
            ProgressStatus = p.Status;
        });
        var log = new Progress<string>(l => MiniLog = l);

        try
        {
            int code = isUninstall
            ? await _installer.UninstallAsync(progress, log, _cts.Token)
            : await _installer.InstallAsync(
                new InstallOptions(BlockUpdates, HidePodcasts, HidePremium, ClearCache),
                                            progress, log, _cts.Token);

            SwitchTo(home: true);

            if (code == 0)
                ShowNotification(
                    isUninstall ? "ГОТОВО" : "УСПЕХ",
                    isUninstall
                    ? "Оригинальный клиент Spotify восстановлен."
                    : "SpotX успешно установлен.",
                    isUninstall ? "#8B5CF6" : "#00E676");
                else
                    ShowNotification("ОШИБКА",
                                     $"Скрипт завершился с кодом {code}.\n\n{MiniLog[..Math.Min(200, MiniLog.Length)]}",
                                     "#FF3B30");
        }
        catch (OperationCanceledException)
        {
            SwitchTo(home: true);
            ShowNotification("ОТМЕНЕНО", "Операция прервана.", "#FFB300");
        }
        catch (Exception ex)
        {
            SwitchTo(home: true);
            ShowNotification("ОШИБКА", ex.Message, "#FF3B30");
        }
    }

    private void ShowNotification(string title, string message, string hexColor)
    {
        PopupTitle = title;
        PopupMessage = message;
        PopupColor = hexColor;
        ShowPopup = true;
    }
}