using UnityEngine;
using System.Collections;


[ExecuteInEditMode]
public class Diaphragm : MonoBehaviour {
	public float OutsideDiameter = 1.0f;
	public float MaxAperture = 0.75f;
	public float MinAperture = 0.05f;
	public int LeafCount = 15;
	public float LeafDegreeLength = 140.0f;
	public int LeafLengthTesselation = 10;
	public float LeafThickness = 0.005f;
	public Material material;
	public bool DrawDebugLines = true;
	public bool updateInEditor = false;

	
	public float MaxLeafAngle = 50.0f;
	[Range(0.0f,1.0f)]
	public float State = 0.0f;
	// Use this for initialization
	void Start () {
		
	}
	
	// Update is called once per frame
	void Update () {
		UpdateLeafs ();
	}
	
	///Vector2//Vec
	
	void UpdateLeafs(){
		if (transform.childCount > LeafCount) {
			int cntRemove = transform.childCount - LeafCount;
			GameObject[] removeArray = new GameObject[cntRemove];
			for (int i = 0; i < cntRemove; ++i) {
				removeArray [i] = transform.GetChild (i).gameObject;
			}
			foreach (GameObject go in removeArray) {
				go.transform.parent = null;
				DestroyImmediate (go);
			}
		} else {
			int cntAdd = LeafCount - transform.childCount;
			for (int i = 0; i < cntAdd; ++i) {
				GameObject obj = AdvancedUtils.CreateMeshObject();
				obj.renderer.sharedMaterial = material;
				obj.transform.parent = transform;
			}
		}
		
		float jointsRadius = (OutsideDiameter * 0.5f + MaxAperture * 0.5f) * 0.5f;
		for (int i = 0; i < LeafCount; ++i) {
			float leafAngle = (360.0f / (float)LeafCount) * (float)i;
			
			GameObject go = transform.GetChild (i).gameObject;
			go.transform.localPosition = GetLeafPosition(i);
			go.transform.localRotation = Quaternion.identity;
			go.transform.localScale = new Vector3(1,1,1);
			
		}





		int leafsCount = transform.childCount;
		
		float rotation = MaxLeafAngle * State;
		
		for (int i = 0; i < leafsCount; ++i) {
			GameObject obj = transform.GetChild(i).gameObject;
			
			if (DrawDebugLines) {
				AdvancedGizmo.DrawCircle(obj.transform.position, Vector3.up, 0.02f, Color.blue, 12, false, 2);
				
			}
			
			var mf = obj.GetComponent<MeshFilter>();
			Mesh m = mf.sharedMesh;
			
			float leafWidth = (OutsideDiameter - MaxAperture) * 0.5f;
			float leafAngularOffset = (360.0f / (float)LeafCount) * (float)i;
			
			int planeVertCnt = (LeafLengthTesselation + 1) * 2;
			int totalVertCnt = planeVertCnt * 4;
			
			float innerRadius = MaxAperture * 0.5f;
			float outerRadius = OutsideDiameter * 0.5f;
			Vector3 leafPosition = GetLeafPosition(i);
			
			float angleBetweenPivots = 360.0f / leafsCount;
			
			float angularElevation = LeafThickness / angleBetweenPivots;
			
			float sectionAngularLength = LeafDegreeLength / (float)LeafLengthTesselation;
			
			//generate vertices& uvs
			Vector3[] vertices = new Vector3[totalVertCnt];
			Vector2[] uvs = new Vector2[vertices.Length];
			
			for(int j = 0; j <= LeafLengthTesselation; ++j){
				float elevation = angularElevation * sectionAngularLength * (float)j;
				Vector3 elevationVector = Vector3.up * - elevation;
				
				Vector3 sliceDirection = Quaternion.AngleAxis(leafAngularOffset + sectionAngularLength * (float)j, Vector3.up) *  Vector3.forward;
				int sliceVertexOffset = j * 8;
				
				vertices[sliceVertexOffset + 0] = sliceDirection * outerRadius - leafPosition + elevationVector;
				vertices[sliceVertexOffset + 1] = sliceDirection * innerRadius - leafPosition + elevationVector;
				vertices[sliceVertexOffset + 2] = vertices[sliceVertexOffset + 1];
				vertices[sliceVertexOffset + 3] = vertices[sliceVertexOffset + 1] + Vector3.up * (-LeafThickness);
				
				vertices[sliceVertexOffset + 4] = vertices[sliceVertexOffset + 3];
				vertices[sliceVertexOffset + 5] = vertices[sliceVertexOffset + 0] + Vector3.up * (-LeafThickness);
				vertices[sliceVertexOffset + 6] = vertices[sliceVertexOffset + 5];
				vertices[sliceVertexOffset + 7] = vertices[sliceVertexOffset + 0];
				
				float u = (1.0f / (float)LeafLengthTesselation) * (float)j;
				for(int k = 0; k < 8; ++k){
					uvs[sliceVertexOffset + k] = new Vector2(u,k%2);
				}
				
			}
			
			//triangulate
			const int trianglePerSection = 8;
			int totalTriangles = trianglePerSection * LeafLengthTesselation;
			const int indicesPerSection = trianglePerSection * 3;
			int totalIndices = indicesPerSection * LeafLengthTesselation;
			int[] indices = new int[totalIndices];
			
			int[] sectionIndices = new int[indicesPerSection]{
				0,8,9, 0,9,1, 2,10,11, 2,11,3,
				4,12,13, 4,13,5, 15,7,6, 15,6,14};
			
			int indexOffset = 0;
			//triangulate per section
			for(int j = 0; j < LeafLengthTesselation; ++j){
				int sectionVertexOffset = j * 8;
				
				for(int k = 0; k < indicesPerSection; ++k){
					indices[indexOffset++] = sectionVertexOffset + sectionIndices[k];
				}
			}
			
			//generate normals
			Vector3[] normals = new Vector3[vertices.Length];
			for(int j = 0; j < indices.Length; j+=3){
				Vector3 normal = AdvancedMath.TriangleNormal(
					vertices[indices[j + 0]], 
					vertices[indices[j + 1]], 
					vertices[indices[j + 2]]);
				
				normals[indices[j + 0]] = normal;
				normals[indices[j + 1]] = normal;
				normals[indices[j + 2]] = normal;
				
			}
			
			m.vertices = vertices;
			m.SetIndices(indices, MeshTopology.Triangles, 0);
			m.uv = uvs;
			m.normals = normals;
			
			
			MeshCollider collider = obj.GetComponent<MeshCollider>();
			if(collider == null){
				collider = obj.AddComponent<MeshCollider>();
				collider.sharedMesh = m;
			}
			obj.transform.localRotation = Quaternion.AngleAxis(rotation, Vector3.up);
		}

	}
	
	Vector3 GetLeafPosition(int id){
		float jointsRadius = (OutsideDiameter * 0.5f + MaxAperture * 0.5f) * 0.5f;
		float leafAngle = (360.0f / (float)LeafCount) * (float)id;
		return Quaternion.AngleAxis(leafAngle, Vector3.up) *  Vector3.forward * jointsRadius;
	}
	
	void OnDrawGizmos(){
		if (updateInEditor) {
			UpdateLeafs ();
		}


		if (DrawDebugLines) {
			AdvancedGizmo.DrawCircle (transform.position, Vector3.up, OutsideDiameter * 0.5f, Color.red, 36);
			AdvancedGizmo.DrawCircle (transform.position, Vector3.up, MaxAperture * 0.5f, Color.green, 36, false, 2);
		}

		

		
		
	}
}