using FluentAssertions;
using IBKRTrader.UI;

namespace IBKRTrader.Tests.UI;

[Trait("cat", "unit")]
public class WindowManagerTests
{
    /// <summary>
    /// Testbare Variante: unterdrückt echte Show-/Focus-Aufrufe (kein Message-Loop),
    /// zählt aber die Focus-Aufrufe.
    /// </summary>
    private sealed class TestWindowManager : WindowManager
    {
        public int FocusCount;
        protected override void Present(Form form) { /* kein Show im Test */ }
        protected override void Focus(Form form) => FocusCount++;
    }

    [Fact]
    public void OpenOrFocus_NewKey_InvokesFactory_AndTracks()
    {
        var wm = new TestWindowManager();
        var created = 0;

        using var form = wm.OpenOrFocus("CT", () => { created++; return new Form(); });

        created.Should().Be(1);
        wm.IsOpen("CT").Should().BeTrue();
        wm.OpenCount.Should().Be(1);
    }

    [Fact]
    public void OpenOrFocus_SameKey_FocusesExisting_DoesNotRecreate()
    {
        var wm = new TestWindowManager();
        var created = 0;

        using var first  = wm.OpenOrFocus("CT", () => { created++; return new Form(); });
        var       second = wm.OpenOrFocus("CT", () => { created++; return new Form(); });

        created.Should().Be(1);
        wm.FocusCount.Should().Be(1);
        second.Should().BeSameAs(first);
        wm.OpenCount.Should().Be(1);
    }

    [Fact]
    public void OpenOrFocus_DifferentKeys_TracksSeparately()
    {
        var wm = new TestWindowManager();

        using var a = wm.OpenOrFocus("A", () => new Form());
        using var b = wm.OpenOrFocus("B", () => new Form());

        wm.OpenCount.Should().Be(2);
        wm.IsOpen("A").Should().BeTrue();
        wm.IsOpen("B").Should().BeTrue();
    }

    [Fact]
    public void OpenOrFocus_AfterDisposed_RecreatesWindow()
    {
        var wm = new TestWindowManager();
        var created = 0;

        var first = wm.OpenOrFocus("CT", () => { created++; return new Form(); });
        first.Dispose();

        wm.IsOpen("CT").Should().BeFalse();

        using var second = wm.OpenOrFocus("CT", () => { created++; return new Form(); });

        created.Should().Be(2);
        second.Should().NotBeSameAs(first);
    }

    [Fact]
    public void CloseAll_RemovesAllWindows()
    {
        var wm = new TestWindowManager();
        wm.OpenOrFocus("A", () => new Form());
        wm.OpenOrFocus("B", () => new Form());

        wm.CloseAll();

        wm.OpenCount.Should().Be(0);
        wm.IsOpen("A").Should().BeFalse();
    }

    [Fact]
    public void OpenOrFocus_BlankKey_Throws()
    {
        var wm = new TestWindowManager();

        var act = () => wm.OpenOrFocus("   ", () => new Form());

        act.Should().Throw<ArgumentException>();
    }
}