using WxAgent.Core;
using Xunit;

namespace WxAgent.Core.Tests;

public sealed class UiDiagnosticsTests
{
    [Fact]
    public void TraversalGuard_StopsCyclesBeforeRecursing()
    {
        var guard = new UiTraversalGuard();
        Assert.True(guard.TryVisit("root", 0));
        Assert.True(guard.TryVisit("child", 1));
        Assert.False(guard.TryVisit("root", 2));
        Assert.True(guard.CycleDetected);
        Assert.Equal(2, guard.NodeCount);
    }

    [Fact]
    public void TraversalGuard_BoundsDepthAndNodesEvenWithMissingRuntimeIds()
    {
        var depth = new UiTraversalGuard(maxDepth: 2);
        Assert.True(depth.TryVisit("", 0));
        Assert.False(depth.TryVisit("", 3));
        Assert.True(depth.Truncated);
        var count = new UiTraversalGuard(maxNodes: 2);
        Assert.True(count.TryVisit("", 0));
        Assert.True(count.TryVisit("", 1));
        Assert.False(count.TryVisit("", 2));
        Assert.Equal(2, count.NodeCount);
    }

    [Fact]
    public void SnapshotComparison_DetectsRequiredControlRegressionWithoutLeakingDynamicIds()
    {
        var baseline = Root(WechatLocators.RequiredAutomationIds);
        var missing = WechatLocators.MessageList;
        var current = Root(WechatLocators.RequiredAutomationIds.Where(id => id != missing).Append("[id:private-hash]").Append("new_static_control"));
        var report = UiSnapshotComparison.Compare(baseline, current);
        Assert.Equal([missing], report.MissingRequiredControls);
        Assert.Equal([missing], report.RemovedAutomationIds);
        Assert.Equal(["new_static_control"], report.AddedAutomationIds);
    }

    private static UiNodeSnapshot Root(IEnumerable<string> ids) =>
        new("Window", "", "", true, "0,0,800,600", ids.Select(id => new UiNodeSnapshot("Pane", "", id, true, "", [])).ToArray());
}