using Godot;
using System;

[Tool]
public class Railway : Path
{
    [Export]
    private Color _color;
    
    [Export]
    private float _gauge = 1f;
    
    private ImmediateGeometry _geo = null;
    private Vector3[] _points = null;
    
    public void OnPathCurveChanged() 
    {
        Curve.Tessellate();
        _points = Curve.GetBakedPoints();
    }
    
    // Called when the node enters the scene tree for the first time.
    public override void _Ready()
    {
        base._Ready();
        
        _geo = GetNode<ImmediateGeometry>("ImmediateGeometry");
        
        var m = new SpatialMaterial();
        m.VertexColorUseAsAlbedo = true;
        m.FlagsUnshaded = true;
        _geo.MaterialOverride = m;

        OnPathCurveChanged();
    }

    public override void _Process(float delta)
    {
        base._Process(delta);
        
        if (_geo == null) return;
        if (_points == null || _points.Length == 0) return;
        
        _geo.Clear();
        _geo.Begin(Mesh.PrimitiveType.LineStrip);
        _geo.SetColor(new Color(1, 0, 0));
        for(int i = 0; i < _points.Length; i++)
        {
            _geo.AddVertex(_points[i]);
        }
        _geo.End();
    }
}