using System.Collections.Generic;
using Xunit;

namespace Recordingtest.Player.Tests;

public class UiaPathResolverTests
{
    private sealed class FakeNode : IUiaTreeNode
    {
        public string ClassName { get; set; } = "";
        public string? AutomationId { get; set; }
        public string? Name { get; set; }
        public ElementBounds Bounds { get; set; }
        public List<FakeNode> ChildList { get; } = new();
        public IEnumerable<IUiaTreeNode> Children => ChildList;
    }

    [Fact]
    public void UiaPathParser_ParsesMultiSegment_WithClassAndId()
    {
        var segs = UiaPathParser.Parse(
            "MetroWindow[@AutomationId='root']/CommandPanel/TextBox[@AutomationId='CommandBox']/TextBox[@AutomationId='CB']");
        Assert.Equal(4, segs.Count);
        Assert.Equal("MetroWindow", segs[0].ClassName);
        Assert.Equal("root", segs[0].AutomationId);
        Assert.Equal("CommandPanel", segs[1].ClassName);
        Assert.Null(segs[1].AutomationId);
        Assert.Equal("TextBox", segs[2].ClassName);
        Assert.Equal("CommandBox", segs[2].AutomationId);
        Assert.Equal("CB", segs[3].AutomationId);
    }

    [Fact]
    public void UiaPathParser_ParsesNameAttribute()
    {
        var seg = UiaPathParser.ParseSegment("Button[@Name='새 파일']");
        Assert.Equal("Button", seg.ClassName);
        Assert.Equal("새 파일", seg.Name);
        Assert.Null(seg.AutomationId);
    }

    [Fact]
    public void UiaPathResolver_Descend_FindsNestedElement()
    {
        var leaf = new FakeNode
        {
            ClassName = "TextBox",
            AutomationId = "CB",
            Bounds = new ElementBounds(10, 20, 30, 40),
        };
        var commandBox = new FakeNode
        {
            ClassName = "TextBox",
            AutomationId = "CommandBox",
        };
        commandBox.ChildList.Add(leaf);
        var panel = new FakeNode { ClassName = "CommandPanel" };
        panel.ChildList.Add(commandBox);
        var root = new FakeNode { ClassName = "MetroWindow", AutomationId = "root" };
        root.ChildList.Add(panel);

        var found = UiaPathResolver.Resolve(
            root,
            "MetroWindow[@AutomationId='root']/CommandPanel/TextBox[@AutomationId='CommandBox']/TextBox[@AutomationId='CB']");

        Assert.NotNull(found);
        Assert.Equal("CB", found!.AutomationId);
        Assert.Equal(10, found.Bounds.X);
    }

    [Fact]
    public void UiaPathResolver_LastSegmentWithoutId_UsesClassName()
    {
        var items = new FakeNode
        {
            ClassName = "ItemsControl",
            Bounds = new ElementBounds(0, 0, 1920, 1040),
        };
        var root = new FakeNode { ClassName = "MetroWindow", AutomationId = "root" };
        root.ChildList.Add(items);

        var found = UiaPathResolver.Resolve(
            root,
            "MetroWindow[@AutomationId='root']/ItemsControl");

        Assert.NotNull(found);
        Assert.Equal("ItemsControl", found!.ClassName);
        Assert.Equal(1920, found.Bounds.Width);
    }

    [Fact]
    public void UiaPathResolver_NotFound_ReturnsNull()
    {
        var root = new FakeNode { ClassName = "MetroWindow", AutomationId = "root" };
        var found = UiaPathResolver.Resolve(
            root,
            "MetroWindow[@AutomationId='root']/Missing");
        Assert.Null(found);
    }

    [Fact]
    public void SmokeRegression_BoxV4CleanLike_ParsesAndResolves()
    {
        // Build a minimal fake tree resembling EG-BIM Modeler.
        var cb = new FakeNode { ClassName = "TextBox", AutomationId = "CB", Bounds = new ElementBounds(400, 1020, 200, 30) };
        var commandBox = new FakeNode { ClassName = "TextBox", AutomationId = "CommandBox" };
        commandBox.ChildList.Add(cb);
        var cmdPanel = new FakeNode { ClassName = "CommandPanel" };
        cmdPanel.ChildList.Add(commandBox);
        var items = new FakeNode { ClassName = "ItemsControl", Bounds = new ElementBounds(0, 0, 1920, 1040) };
        var root = new FakeNode { ClassName = "MetroWindow", AutomationId = "root" };
        root.ChildList.Add(cmdPanel);
        root.ChildList.Add(items);

        var paths = new[]
        {
            "MetroWindow[@AutomationId='root']/ItemsControl",
            "MetroWindow[@AutomationId='root']/CommandPanel/TextBox[@AutomationId='CommandBox']/TextBox[@AutomationId='CB']",
        };

        foreach (var p in paths)
        {
            var n = UiaPathResolver.Resolve(root, p);
            Assert.NotNull(n);
        }

        // The two paths should resolve to *different* nodes — proving the
        // resolver no longer collapses to "first descendant".
        var n1 = UiaPathResolver.Resolve(root, paths[0])!;
        var n2 = UiaPathResolver.Resolve(root, paths[1])!;
        Assert.NotSame(n1, n2);
        Assert.Equal("ItemsControl", n1.ClassName);
        Assert.Equal("CB", n2.AutomationId);
    }
}