using Avalonia.Controls;
using Avalonia.Headless.XUnit;
using AvParser.UI;
using AvParser.UI.ViewModels;
using AvParser.UI.Views;
using Microsoft.Extensions.DependencyInjection;

namespace AvParser.UI.HeadlessTests;

public class ViewLocatorTests
{
    private static ViewLocator Locator(Action<IServiceCollection>? configure = null)
    {
        var services = new ServiceCollection();
        configure?.Invoke(services);
        return new ViewLocator(services.BuildServiceProvider());
    }

    [Fact]
    public void Matches_view_models_only()
    {
        var locator = Locator();

        locator.Match(new FakePage("x")).ShouldBeTrue();
        locator.Match("a string").ShouldBeFalse();
        locator.Match(null).ShouldBeFalse();
    }

    [AvaloniaFact]
    public void Resolves_a_view_by_naming_convention()
    {
        var locator = Locator();
        var viewModel = new AboutViewModel(new TestPaths());

        var view = locator.Build(viewModel);

        view.ShouldBeOfType<AboutView>();
        view.DataContext.ShouldBeSameAs(viewModel);
    }

    [AvaloniaFact]
    public void Prefers_a_registered_view_over_activation()
    {
        var registered = new AboutView();
        var locator = Locator(services => services.AddSingleton(registered));

        var view = locator.Build(new AboutViewModel(new TestPaths()));

        view.ShouldBeSameAs(registered);
    }

    [AvaloniaFact]
    public void Reports_a_missing_view_instead_of_throwing()
    {
        var locator = Locator();

        // "FakePage" matches neither half of the convention, so the locator must report a miss
        // rather than resolving the view model as its own view and failing to activate it.
        var view = locator.Build(new FakePage("x"));

        view.ShouldBeOfType<TextBlock>().Text!.ShouldContain("View not found");
    }

    [Fact]
    public void Builds_a_placeholder_for_a_null_view_model() => Locator().Build(null).ShouldBeOfType<TextBlock>();

    private sealed class TestPaths : Infrastructure.Storage.IAppPaths
    {
        public string DataDirectory => Path.Combine(Path.GetTempPath(), "AvParserTests");

        public string SettingsFile => Path.Combine(DataDirectory, "settings.json");

        public string CustomProxiesFile => Path.Combine(DataDirectory, "proxies.custom.json");

        public string ProxyStateFile => Path.Combine(DataDirectory, "proxies.state.json");

        public string LogDirectory => Path.Combine(DataDirectory, "logs");
    }
}