using UnityEngine;
using Forge;
using Forge.Primitives;
using Forge.Filters;

public class DNADoubleHelix : ProceduralAsset {

	private float Radius = 0.04f;
	private float Offset = 0.4f;

	[Range(0, 70)] public int Copies = 1;
	[Range(-20f, 20f)] public float Twist = 5f;
	[Range(0.0f, 0.5f)] public float SegmentLength = 0.05f;

	private int Detail = 8;

	public override Geometry Build() {

		// A
		var circle1 = new Circle();
		circle1.Radius = Radius;
		circle1.Center = new Vector3(Offset, 0f, 0f);
		circle1.Segments = Detail;

		var copy1 = new Copy(circle1.Output());
		copy1.Rotation = new Vector3(0f, Twist, 0f);
		copy1.Position = new Vector3(0f, SegmentLength, 0f);
		copy1.Copies = Copies;

		var bridge1 = new Bridge(copy1.Output());

		// B
		var circle2 = new Circle();
		circle2.Radius = Radius;
		circle2.Center = new Vector3(-Offset, 0f, 0f);
		circle2.Segments = Detail;

		var copy2 = new Copy(circle2.Output());
		copy2.Rotation = new Vector3(0f, Twist, 0f);
		copy2.Position = new Vector3(0f, SegmentLength, 0f);
		copy2.Copies = Copies;

		var bridge2 = new Bridge(copy2.Output());

		// C
		var circle3 = new Circle();
		circle3.Radius = Radius / 3;
		circle3.Orientation = OrientationPreset.ZY;
		circle3.Center = new Vector3(Offset, 0f, 0f);
		circle3.Segments = Detail;

		var mirror = new Mirror(circle3.Output());
		var mid = new Merge(Reverse.Process(circle3.Output()), mirror.Output());
		var midBridge = new Bridge(mid.Output());
		midBridge.RecalculateNormals = true;

		var midCopy = new Copy(midBridge.Output());
		midCopy.Copies = Copies / 2 - 1;
		midCopy.Rotation = new Vector3(0f, Twist * 2, 0f);
		midCopy.Position = new Vector3(0f, SegmentLength * 2, 0f);

		// Glue all the pieces now!
		var merge = new Merge(
			bridge1.Output(),
			midCopy.Output(),
			bridge2.Output()
		);

		return merge.Output();
	}

}