using System;
using System.Diagnostics;
using System.IO;
using ClaudeDo.Ui.Localization;
using ClaudeDo.Ui.Services;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

namespace ClaudeDo.Ui.ViewModels.Modals;

public sealed partial class WorkerConnectionModalViewModel : ViewModelBase
{
    private readonly WorkerLocator _workerLocator;
    private readonly InstallerLocator _installerLocator;

    // Test seam: real Process.Start by default, swappable to simulate a blocked/failed launch.
    internal Action<ProcessStartInfo> ProcessStarter { get; set; } = psi => Process.Start(psi);

    public WorkerConnectionModalViewModel(WorkerLocator workerLocator, InstallerLocator installerLocator)
    {
        _workerLocator = workerLocator;
        _installerLocator = installerLocator;
    }

    public Action? CloseAction { get; set; }

    [ObservableProperty] private string? _errorText;

    [RelayCommand] private void Close() => CloseAction?.Invoke();

    [RelayCommand]
    private void StartWorker()
    {
        var exe = _workerLocator.Find();
        if (exe is null)
        {
            ErrorText = Loc.T("modals.workerConnection.workerNotFound");
            return;
        }
        try
        {
            ProcessStarter(new ProcessStartInfo(exe) { UseShellExecute = true });
        }
        catch (Exception ex)
        {
            ErrorText = Loc.T("modals.workerConnection.startFailed", ex.Message);
            return;
        }
        ErrorText = null;
        CloseAction?.Invoke();
    }

    [RelayCommand]
    private void RerunInstaller()
    {
        var path = _installerLocator.Find();
        if (path is null)
        {
            ErrorText = Loc.T("modals.workerConnection.installerNotFound");
            return;
        }
        try
        {
            // See IslandsShellViewModel.UpdateNow: an inherited CWD inside the install dir
            // makes the installer block its own app\ rename.
            ProcessStarter(new ProcessStartInfo(path)
            {
                UseShellExecute = true,
                WorkingDirectory = Path.GetTempPath(),
            });
        }
        catch (Exception ex)
        {
            ErrorText = Loc.T("modals.workerConnection.startFailed", ex.Message);
            return;
        }
        Environment.Exit(0);
    }
}