package Current.popups.Unfold;

import Current.*;
import Current.basic.*;




public class Corridor {
    public double t1,t2;
    public int i1,i2;
    public int ii1,ii2;
    public VertexPair V;

    public Corridor() {}

    /***this is positive iff there is a billiard path*/

    public void compute(String W,ListenTriangle[] T2,int n) {
	i1=0;
	i2=0;
	ii1=0;
	ii2=0;
	int digit=0;
	int temp=0;

	/*first compute top*/
	double top=-100000;
	double yy=-100000.0;
	for(int i=n-1;i>=0;--i) {
	digit=1+Converter.getDigit(W,i);
	if((digit==1)&&(i%2==0)) {temp=1;yy=T2[i+1].z[1].y;}
	if((digit==2)&&(i%2==0)) {temp=2;yy=T2[i+1].z[2].y;}
	if((digit==3)&&(i%2==0)) {temp=0;yy=T2[i+1].z[0].y;}
	if((digit==1)&&(i%2==1)) {temp=2;yy=T2[i+1].z[2].y;}
	if((digit==2)&&(i%2==1)) {temp=0;yy=T2[i+1].z[0].y;}
	if((digit==3)&&(i%2==1)) {temp=1; yy=T2[i+1].z[1].y;}
	if(top<yy) {top=yy;t1=top;i1=i+1;ii1=temp;}
	}


	double bot=100000;
	yy=100000.0;

	for(int i=n-1;i>=0;--i) {
	digit=1+Converter.getDigit(W,i);
	if((digit==1)&&(i%2==1)) {temp=1;yy=T2[i+1].z[1].y;}
	if((digit==2)&&(i%2==1)) {temp=2;yy=T2[i+1].z[2].y;}
	if((digit==3)&&(i%2==1)) {temp=0;yy=T2[i+1].z[0].y;}
	if((digit==1)&&(i%2==0)) {temp=2;yy=T2[i+1].z[2].y;}
	if((digit==2)&&(i%2==0)) {temp=0;yy=T2[i+1].z[0].y;}
	if((digit==3)&&(i%2==0)) {temp=1; yy=T2[i+1].z[1].y;}

	if(bot>yy) {bot=yy;t2=bot;i2=i+1;ii2=temp;}
	}
    }


    public VertexPair getLeader(String W,Complex Z) {
	  int n=W.length();
          ListenTriangle[] T1=UnfoldCanvas.rawUnfold(ListenTriangle.init(Z),W);
          ListenTriangle[] T2=UnfoldCanvas.rotateHorizontal(T1,n);
	  compute(W,T2,n);
	  VertexPair V=new VertexPair(1,this.i1,2,this.i2);
	  return(V);
    }


    public static double geometricEvaluate(String W,VertexPair V,Complex Z,int debug) {
	int n=W.length();
        ListenTriangle[] T1=UnfoldCanvas.rawUnfold(ListenTriangle.init(Z),W);
        ListenTriangle[] T2=UnfoldCanvas.rotateHorizontal(T1,n);
	CombinatorialTriangle[] CT=CombinatorialTriangle.unfold(W);
	int a1=Converter.coordsToType(CT[V.e1],V.o1);
	int a2=Converter.coordsToType(CT[V.e2],V.o2);
	int s=Converter.spineNumber(V,CT);
	Complex z1=T2[V.e1].z[a1];
	Complex z2=T2[V.e2].z[a2];
	Complex z3=Complex.minus(z1,z2);
	double scale=1;
	if(s==0) scale=Math.sin(Math.PI*Z.x*0.5);
	if(s==1) scale=Math.sin(Math.PI*Z.y*0.5);
	if(s==2) scale=Math.sin(Math.PI*(2-Z.x-Z.y)*0.5);
	return(z3.y/(scale*scale));
    }




}