using Xunit;

namespace Recordingtest.Recorder.Tests;

public class WindowPointResolverTests
{
    private sealed class FakeSnapshot : IElementSnapshot
    {
        public string Tag { get; init; } = "";
        public string ClassName => Tag;
        public string? AutomationId => null;
        public string? Name => Tag;
        public bool IsPassword => false;
        public (double Left, double Top, double Width, double Height) BoundingRectangle => (0, 0, 0, 0);
        public IElementSnapshot? Parent => null;
    }

    private sealed class FakeSource : IWindowPointSource
    {
        public int? Pid { get; set; }
        public IElementSnapshot? Primary { get; set; }
        public IElementSnapshot? SutScope { get; set; }
        public int? GetProcessIdAt(int x, int y) => Pid;
        public IElementSnapshot? GetElementAt(int x, int y) => Primary;
        public IElementSnapshot? GetElementFromSutScope(int x, int y) => SutScope;
    }

    [Fact]
    public void Resolve_SamePid_ReturnsPrimary()
    {
        var primary = new FakeSnapshot { Tag = "primary" };
        var sut = new FakeSnapshot { Tag = "sut" };
        var src = new FakeSource { Pid = 100, Primary = primary, SutScope = sut };
        var r = WindowPointResolver.Resolve(src, 10, 20, sutPid: 100);
        Assert.Same(primary, r);
    }

    [Fact]
    public void Resolve_DifferentPid_FallsBackToSutScope()
    {
        var primary = new FakeSnapshot { Tag = "primary" };
        var sut = new FakeSnapshot { Tag = "sut" };
        var src = new FakeSource { Pid = 999, Primary = primary, SutScope = sut };
        var r = WindowPointResolver.Resolve(src, 10, 20, sutPid: 100);
        Assert.Same(sut, r);
    }

    [Fact]
    public void Resolve_UnknownPid_ReturnsPrimary()
    {
        var primary = new FakeSnapshot { Tag = "primary" };
        var src = new FakeSource { Pid = null, Primary = primary, SutScope = null };
        var r = WindowPointResolver.Resolve(src, 10, 20, sutPid: 100);
        Assert.Same(primary, r);
    }

    [Fact]
    public void Resolve_ZeroPid_ReturnsPrimary()
    {
        var primary = new FakeSnapshot { Tag = "primary" };
        var src = new FakeSource { Pid = 0, Primary = primary, SutScope = null };
        var r = WindowPointResolver.Resolve(src, 10, 20, sutPid: 100);
        Assert.Same(primary, r);
    }

    [Fact]
    public void Resolve_DifferentPid_FallbackNull_ReturnsPrimary()
    {
        // Documented semantic: if SUT-scope fallback can't find anything,
        // keep the primary as a last resort rather than dropping the event.
        var primary = new FakeSnapshot { Tag = "primary" };
        var src = new FakeSource { Pid = 999, Primary = primary, SutScope = null };
        var r = WindowPointResolver.Resolve(src, 10, 20, sutPid: 100);
        Assert.Same(primary, r);
    }
}