/*
 * Copyright (c) 2025 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ProtonVPN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using CommunityToolkit.Mvvm.Input;
using Microsoft.UI.Xaml.Media;
using ProtonVPN.Client.Contracts.Services.Lifecycle;
using ProtonVPN.Client.Core.Bases;
using ProtonVPN.Client.Core.Bases.ViewModels;
using ProtonVPN.Client.Core.Messages;
using ProtonVPN.Client.Core.Services.Activation;
using ProtonVPN.Client.Core.Services.Selection;
using ProtonVPN.Client.EventMessaging.Contracts;
using ProtonVPN.Client.Logic.Auth.Contracts;
using ProtonVPN.Client.Logic.Auth.Contracts.Messages;
using ProtonVPN.Client.Logic.Connection.Contracts;
using ProtonVPN.Client.Logic.Connection.Contracts.Messages;
using ProtonVPN.Client.Logic.Connection.Contracts.Models.Intents;
using ProtonVPN.Client.Logic.Recents.Contracts;
using ProtonVPN.Client.Logic.Servers.Cache;
using ProtonVPN.Common.Core.Helpers;
using ProtonVPN.StatisticalEvents.Contracts.Dimensions;

namespace ProtonVPN.Client.UI.Tray;

public partial class TrayIconComponentViewModel : ViewModelBase,
    IEventMessageReceiver<ConnectionStatusChangedMessage>,
    IEventMessageReceiver<LoggedInMessage>,
    IEventMessageReceiver<LoggedOutMessage>,
    IEventMessageReceiver<AppIconStatusChangedMessage>
{
    private readonly IAppExitInvoker _appExitInvoker;
    private readonly IServersCache _serversCache;
    private readonly IMainWindowActivator _mainWindowActivator;
    private readonly ITrayAppWindowActivator _trayAppWindowActivator;
    private readonly IRecentConnectionsManager _recentConnectionsManager;
    private readonly IConnectionManager _connectionManager;
    private readonly IUserAuthenticator _userAuthenticator;
    private readonly IApplicationIconSelector _applicationIconSelector;

    public ImageSource IconSource => _applicationIconSelector.GetStatusIcon();

    // GUID value generated by hashing "ProtonVPN" with SHA1 and taking first 16 bytes
    public Guid TrayIconGuid => OSVersion.IsWindows11OrHigher() ? new("{50487227-4f3b-071d-baec-cd22bfff900d}") : Guid.Empty;

    public string ApplicationName { get; } = App.APPLICATION_NAME;

    public string OpenApplicationLabel => Localizer.GetFormat("System_Tray_Actions_OpenApplication", ApplicationName);

    public TrayIconComponentViewModel(
        IAppExitInvoker appExitInvoker,
        IServersCache serversCache,
        IMainWindowActivator mainWindowActivator,
        ITrayAppWindowActivator trayAppWindowActivator,
        IRecentConnectionsManager recentConnectionsManager,
        IConnectionManager connectionManager,
        IUserAuthenticator userAuthenticator,
        IApplicationIconSelector applicationIconSelector,
        IViewModelHelper viewModelHelper)
        : base(viewModelHelper)
    {
        _appExitInvoker = appExitInvoker;
        _serversCache = serversCache;
        _mainWindowActivator = mainWindowActivator;
        _trayAppWindowActivator = trayAppWindowActivator;
        _recentConnectionsManager = recentConnectionsManager;
        _connectionManager = connectionManager;
        _userAuthenticator = userAuthenticator;
        _applicationIconSelector = applicationIconSelector;
    }

    [RelayCommand]
    public void ShowApplication()
    {
        _mainWindowActivator.Activate();
    }

    [RelayCommand]
    public void ShowTrayApplication()
    {
        // When not logged in, skip the tray app and open the application instead
        if (!_userAuthenticator.IsLoggedIn || _serversCache.HasNoServers())
        {
            ShowApplication();
            return;
        }

        _trayAppWindowActivator.Activate();
    }

    [RelayCommand]
    public async Task ExitApplicationAsync()
    {
        await _appExitInvoker.ExitWithConfirmationAsync();
    }

    [RelayCommand(CanExecute = nameof(CanConnect))]
    public async Task ConnectAsync()
    {
        IConnectionIntent defaultConnectionIntent = _recentConnectionsManager.GetDefaultConnection();

        await _connectionManager.ConnectAsync(VpnTriggerDimension.Tray, defaultConnectionIntent);
    }

    [RelayCommand(CanExecute = nameof(CanDisconnect))]
    public async Task DisconnectAsync()
    {
        await _connectionManager.DisconnectAsync(VpnTriggerDimension.Tray);
    }

    public void Receive(ConnectionStatusChangedMessage message)
    {
        ExecuteOnUIThread(InvalidateTray);
    }

    public void Receive(LoggedInMessage message)
    {
        ExecuteOnUIThread(InvalidateTray);
    }

    public void Receive(LoggedOutMessage message)
    {
        ExecuteOnUIThread(InvalidateTray);
    }

    public void Receive(AppIconStatusChangedMessage message)
    {
        ExecuteOnUIThread(InvalidateTray);
    }

    protected override void OnLanguageChanged()
    {
        base.OnLanguageChanged();

        OnPropertyChanged(nameof(OpenApplicationLabel));
    }

    private bool CanConnect()
    {
        return _userAuthenticator.IsLoggedIn
            && _connectionManager.IsDisconnected
            && _connectionManager.IsConnectAllowed
            && !_serversCache.HasNoServers();
    }

    private bool CanDisconnect()
    {
        return _userAuthenticator.IsLoggedIn
            && !_connectionManager.IsDisconnected;
    }

    private void InvalidateTray()
    {
        ConnectCommand.NotifyCanExecuteChanged();
        DisconnectCommand.NotifyCanExecuteChanged();

        OnPropertyChanged(nameof(IconSource));
    }
}