using Godot;

public partial class TeleportMarker : Node3D
{
    private static readonly Color IdleColor = new(0.2f, 0.55f, 0.9f);
    private static readonly Color HotColor = new(0.4f, 0.95f, 1.0f);

    [Export]
    public string MarkerLabel { get; set; } = "1";

    private StandardMaterial3D _discMaterial;
    private StandardMaterial3D _beamMaterial;
    private MeshInstance3D _beam;
    private Label3D _label;

    public bool IsNear { get; private set; }

    public override void _Ready()
    {
        AddToGroup("teleport_marker");

        _discMaterial = MakeMaterial(IdleColor, false);
        _beamMaterial = MakeMaterial(new Color(IdleColor, 0.35f), true);

        GetNode<MeshInstance3D>("Disc").SetSurfaceOverrideMaterial(0, _discMaterial);
        _beam = GetNode<MeshInstance3D>("Beam");
        _beam.SetSurfaceOverrideMaterial(0, _beamMaterial);
        _label = GetNode<Label3D>("Label3D");
        _label.Text = MarkerLabel;
    }

    public void SetNear(bool near)
    {
        if (IsNear == near)
            return;
        IsNear = near;
        GetNode<MeshInstance3D>("Disc").Visible = !near;
        _beam.Visible = !near;
        _label.Visible = !near;
    }

    public void SetHighlighted(bool highlighted)
    {
        Color c = highlighted ? HotColor : IdleColor;
        _discMaterial.AlbedoColor = c;
        _discMaterial.Emission = c;
        _beamMaterial.AlbedoColor = new Color(c, 0.35f);
        _beamMaterial.Emission = c;
    }

    private static StandardMaterial3D MakeMaterial(Color color, bool transparent) => new()
    {
        AlbedoColor = color,
        EmissionEnabled = true,
        Emission = color,
        EmissionEnergyMultiplier = 2.0f,
        Transparency = transparent ? BaseMaterial3D.TransparencyEnum.Alpha : BaseMaterial3D.TransparencyEnum.Disabled,
    };
}