using ClaudeDo.Installer.Core;
using ClaudeDo.Installer.Pages.InstallPage;
using ClaudeDo.Installer.Pages.PathsPage;
using ClaudeDo.Installer.Pages.ServicePage;
using ClaudeDo.Installer.Pages.SystemCheckPage;
using ClaudeDo.Installer.Pages.UiSettingsPage;
using ClaudeDo.Installer.Pages.WelcomePage;
using ClaudeDo.Installer.Views;
using Microsoft.Extensions.DependencyInjection;

namespace ClaudeDo.Installer.Tests;

public class WizardViewModelTests
{
    private static IReadOnlyList<IInstallerPage> BuildAllPages(InstallContext context)
    {
        var emptyServiceProvider = new ServiceCollection().BuildServiceProvider();
        return new IInstallerPage[]
        {
            new WelcomePageViewModel(context),
            new SystemCheckPageViewModel(context, () => throw new InvalidOperationException("not needed for this test")),
            new PathsPageViewModel(context),
            new ServicePageViewModel(context),
            new UiSettingsPageViewModel(context),
            new InstallPageViewModel(context, emptyServiceProvider),
        };
    }

    [Fact]
    public void FreshInstall_includes_SystemCheckPage_directly_after_welcome()
    {
        var context = new InstallContext { Mode = InstallerMode.FreshInstall };
        var resolver = new PageResolver(BuildAllPages(context));
        var vm = new WizardViewModel(resolver, context, new FakeLocalizer());

        var pages = vm.Pages.ToList();
        var welcomeIndex = pages.FindIndex(p => p is WelcomePageViewModel);
        var systemCheckIndex = pages.FindIndex(p => p is SystemCheckPageViewModel);

        Assert.NotEqual(-1, welcomeIndex);
        Assert.Equal(welcomeIndex + 1, systemCheckIndex);
    }

    [Fact]
    public void Update_mode_does_not_show_SystemCheckPage()
    {
        var context = new InstallContext { Mode = InstallerMode.Update };
        var resolver = new PageResolver(BuildAllPages(context));
        var vm = new WizardViewModel(resolver, context, new FakeLocalizer());

        Assert.DoesNotContain(vm.Pages, p => p is SystemCheckPageViewModel);
    }
}