using ZB.MOM.WW.ScadaBridge.CentralUI.Services;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Templates;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Services;

public class TemplatePathFormatterTests
{
    private static Dictionary<int, TemplateFolder> Folders(params TemplateFolder[] f) => f.ToDictionary(x => x.Id);

    /// <summary>Verifies that a root template is formatted as its name only.</summary>
    [Fact]
    public void RootTemplate_IsNameOnly()
    {
        var t = new Template("Motor Controller") { Id = 1, FolderId = null };
        Assert.Equal("Motor Controller", TemplatePathFormatter.Format(t, Folders()));
    }

    /// <summary>Verifies that a nested template is formatted with its folder chain joined by slashes.</summary>
    [Fact]
    public void NestedTemplate_JoinsFolderChainWithSlashes()
    {
        var controllers = new TemplateFolder("Controllers") { Id = 10, ParentFolderId = null };
        var conveyor = new TemplateFolder("Conveyor") { Id = 11, ParentFolderId = 10 };
        var t = new Template("MES Line Controller") { Id = 1, FolderId = 11 };
        Assert.Equal("Controllers / Conveyor / MES Line Controller",
            TemplatePathFormatter.Format(t, Folders(controllers, conveyor)));
    }

    /// <summary>Verifies that an unknown folder id falls back to the name only without throwing.</summary>
    [Fact]
    public void UnknownFolderId_FallsBackToNameOnly_WithoutThrowing()
    {
        var t = new Template("Orphan") { Id = 1, FolderId = 999 };
        Assert.Equal("Orphan", TemplatePathFormatter.Format(t, Folders()));
    }

    /// <summary>Verifies that a cycle in the folder chain terminates instead of looping forever.</summary>
    [Fact]
    public void FolderCycle_Terminates()
    {
        var a = new TemplateFolder("A") { Id = 1, ParentFolderId = 2 };
        var b = new TemplateFolder("B") { Id = 2, ParentFolderId = 1 };
        var t = new Template("T") { Id = 1, FolderId = 1 };
        var s = TemplatePathFormatter.Format(t, Folders(a, b));
        Assert.EndsWith("T", s); // no hang, no exception
    }
}