package org.papervision3d.core.render.filter
{

    
    import flash.utils.*;
    
    import org.papervision3d.cameras.Camera3D;
    import org.papervision3d.core.clipping.draw.Clipping;
    import org.papervision3d.core.render.command.RenderTriangle;
    import org.papervision3d.core.render.command.RenderableListItem;
    import org.papervision3d.core.render.data.QuadTree;
    import org.papervision3d.scenes.Scene3D;

    /**
    * Corrects triangle z-sorting
    */
    public class student_ar_org_papervision3d_core_render_filter_QuadrantZFilter extends AbstractQuadrantFilter
    {
        private var maxdelay:int;
    	private var _focus:Number;
    	
    	private var start:int;
        private var check:int;
    
        private var primitives:Array;
        private var pri:RenderableListItem;
        private var turn:int;
        private var leftover:Array;
        
        private var maxZ:Number;
        private var minZ:Number;
        private var maxdeltaZ:Number;
        
        private var rivals:Array;
        private var rival:RenderableListItem;
        
        private var parts:Array;
        private var part:RenderableListItem;
        
        private var ZOrderDeeper:int = 1;
        private var ZOrderIrrelevant:int = 0;
        private var ZOrderHigher:int = -1;
        private var ZOrderSame:int = 0;
		
		private var q0x:Number;
        private var q0y:Number;
        private var q1x:Number;
        private var q1y:Number;
        private var q2x:Number;
        private var q2y:Number;
    
        private var r0x:Number;
        private var r0y:Number;
        private var r1x:Number;
        private var r1y:Number;
    
        private var ql01a:Number;
        private var ql01b:Number;
        private var ql01c:Number;
        private var ql01s:Number;
        private var ql01r0:Number;
        private var ql01r1:Number;
        
        private var ql12a:Number;
        private var ql12b:Number;
        private var ql12c:Number;
        private var ql12s:Number;
        private var ql12r0:Number;
        private var ql12r1:Number;
        
        private var ql20a:Number;
        private var ql20b:Number;
        private var ql20c:Number;
        private var ql20s:Number;
        private var ql20r0:Number;
        private var ql20r1:Number;
    
        private var rla:Number;
        private var rlb:Number;
        private var rlc:Number;
        private var rlq0:Number;
        private var rlq1:Number;
        private var rlq2:Number;
        
        private var q01r:Boolean;
        private var q12r:Boolean;
        private var q20r:Boolean;
    
        private var q01rx:Number;
        private var q01ry:Number;
        private var q12rx:Number;
        private var q12ry:Number;
        private var q20rx:Number;
        private var q20ry:Number;
        private var count:int;
        private var cx:Number;
        private var cy:Number;
        
        private var q01rd:Number;
        private var q12rd:Number;
        private var q20rd:Number;
        
        private var w0x:Number;
        private var w0y:Number;
        private var w1x:Number;
        private var w1y:Number;
        private var w2x:Number;
        private var w2y:Number;
    	
        private var ql01w0:Number;
        private var ql01w1:Number;
        private var ql01w2:Number;
        
        private var ql12w0:Number;
        private var ql12w1:Number;
        private var ql12w2:Number;
        
        private var ql20w0:Number;
        private var ql20w1:Number;
        private var ql20w2:Number;
        
        private var wl01a:Number;
        private var wl01b:Number;
        private var wl01c:Number;
        private var wl01s:Number;
        private var wl01q0:Number;
        private var wl01q1:Number;
        private var wl01q2:Number;
        
        private var wl12a:Number;
        private var wl12b:Number;
        private var wl12c:Number;
        private var wl12s:Number;
        private var wl12q0:Number;
        private var wl12q1:Number;
        private var wl12q2:Number;
        
        private var wl20a:Number;
        private var wl20b:Number;
        private var wl20c:Number;
        private var wl20s:Number;
        private var wl20q0:Number;
        private var wl20q1:Number;
        private var wl20q2:Number;
        
        private var q01w01:Boolean;
        private var q12w01:Boolean;
        private var q20w01:Boolean;
        private var q01w12:Boolean;
        private var q12w12:Boolean;
        private var q20w12:Boolean;
        private var q01w20:Boolean;
        private var q12w20:Boolean;
        private var q20w20:Boolean;
        
        private var q01w01x:Number;
        private var q01w01y:Number;
        private var q12w01x:Number;
        private var q12w01y:Number;
        private var q20w01x:Number;
        private var q20w01y:Number;
        private var q01w12x:Number;
        private var q01w12y:Number;
        private var q12w12x:Number;
        private var q12w12y:Number;
        private var q20w12x:Number;
        private var q20w12y:Number;
        private var q01w20x:Number;
        private var q01w20y:Number;
        private var q12w20x:Number;
        private var q12w20y:Number;
        private var q20w20x:Number;
        private var q20w20y:Number;
        
        private var q01w01d:Number;
        private var q12w01d:Number;
        private var q20w01d:Number;
        private var q01w12d:Number;
        private var q12w12d:Number;
        private var q20w12d:Number;
        private var q01w20d:Number;
        private var q12w20d:Number;
        private var q20w20d:Number;
        
        private var az:Number;
    	private var bz:Number;
        
        private function zconflict(q:RenderableListItem, w:RenderableListItem):int
        {
            if (q is RenderTriangle && q.instance.testQuad)
            { 
                if (w is RenderTriangle && q.instance.testQuad)
                    return zconflictTT(q as RenderTriangle, w as RenderTriangle);
            }
            return ZOrderIrrelevant;
        }
       
        private function zconflictTT(q:RenderTriangle, w:RenderTriangle):int
        {
            q0x = q.v0.x;
            q0y = q.v0.y;
            q1x = q.v1.x;
            q1y = q.v1.y;
            q2x = q.v2.x;
            q2y = q.v2.y;
    
            w0x = w.v0.x;
            w0y = w.v0.y;
            w1x = w.v1.x;
            w1y = w.v1.y;
            w2x = w.v2.x;
            w2y = w.v2.y;
    
            ql01a = q1y - q0y;
            ql01b = q0x - q1x;
            ql01c = -(ql01b*q0y + ql01a*q0x);
            ql01s = ql01a*q2x + ql01b*q2y + ql01c;
            ql01w0 = (ql01a*w0x + ql01b*w0y + ql01c) * ql01s;
            ql01w1 = (ql01a*w1x + ql01b*w1y + ql01c) * ql01s;
            ql01w2 = (ql01a*w2x + ql01b*w2y + ql01c) * ql01s;
    
                if ((ql01w0 <= 0.0001) && (ql01w1 <= 0.0001) && (ql01w2 <= 0.0001))
                    return ZOrderIrrelevant;
    
            ql12a = q2y - q1y;
            ql12b = q1x - q2x;
            ql12c = -(ql12b*q1y + ql12a*q1x);
            ql12s = ql12a*q0x + ql12b*q0y + ql12c;
            ql12w0 = (ql12a*w0x + ql12b*w0y + ql12c) * ql12s;
            ql12w1 = (ql12a*w1x + ql12b*w1y + ql12c) * ql12s;
            ql12w2 = (ql12a*w2x + ql12b*w2y + ql12c) * ql12s;
    
                if ((ql12w0 <= 0.0001) && (ql12w1 <= 0.0001) && (ql12w2 <= 0.0001))
                    return ZOrderIrrelevant;
    
            ql20a = q0y - q2y;
            ql20b = q2x - q0x;
            ql20c = -(ql20b*q2y + ql20a*q2x);
            ql20s = ql20a*q1x + ql20b*q1y + ql20c;
            ql20w0 = (ql20a*w0x + ql20b*w0y + ql20c) * ql20s;
            ql20w1 = (ql20a*w1x + ql20b*w1y + ql20c) * ql20s;
            ql20w2 = (ql20a*w2x + ql20b*w2y + ql20c) * ql20s;
    
                if ((ql20w0 <= 0.0001) && (ql20w1 <= 0.0001) && (ql20w2 <= 0.0001))
                    return ZOrderIrrelevant;
    
            wl01a = w1y - w0y;
            wl01b = w0x - w1x;
            wl01c = -(wl01b*w0y + wl01a*w0x);
            wl01s = wl01a*w2x + wl01b*w2y + wl01c;
            wl01q0 = (wl01a*q0x + wl01b*q0y + wl01c) * wl01s;
            wl01q1 = (wl01a*q1x + wl01b*q1y + wl01c) * wl01s;
            wl01q2 = (wl01a*q2x + wl01b*q2y + wl01c) * wl01s;
    
                if ((wl01q0 <= 0.0001) && (wl01q1 <= 0.0001) && (wl01q2 <= 0.0001))
                    return ZOrderIrrelevant;
    
            wl12a = w2y - w1y;
            wl12b = w1x - w2x;
            wl12c = -(wl12b*w1y + wl12a*w1x);
            wl12s = wl12a*w0x + wl12b*w0y + wl12c;
            wl12q0 = (wl12a*q0x + wl12b*q0y + wl12c) * wl12s;
            wl12q1 = (wl12a*q1x + wl12b*q1y + wl12c) * wl12s;
            wl12q2 = (wl12a*q2x + wl12b*q2y + wl12c) * wl12s;
    
                if ((wl12q0 <= 0.0001) && (wl12q1 <= 0.0001) && (wl12q2 <= 0.0001))
                    return ZOrderIrrelevant;
                    
          
    
            wl20a = w0y - w2y;
            wl20b = w2x - w0x;
            wl20c = -(wl20b*w2y + wl20a*w2x);
            wl20s = wl20a*w1x + wl20b*w1y + wl20c;
            wl20q0 = (wl20a*q0x + wl20b*q0y + wl20c) * wl20s;
            wl20q1 = (wl20a*q1x + wl20b*q1y + wl20c) * wl20s;
            wl20q2 = (wl20a*q2x + wl20b*q2y + wl20c) * wl20s;
    
                if ((wl20q0 <= 0.0001) && (wl20q1 <= 0.0001) && (wl20q2 <= 0.0001))
                    return ZOrderIrrelevant;
                    
            
                if (((wl01q0*wl01q0 <= 0.0001) || (wl12q0*wl12q0 <= 0.0001) || (wl20q0*wl20q0 <= 0.0001))
                 && ((wl01q1*wl01q1 <= 0.0001) || (wl12q1*wl12q1 <= 0.0001) || (wl20q1*wl20q1 <= 0.0001))
                 && ((wl01q2*wl01q2 <= 0.0001) || (wl12q2*wl12q2 <= 0.0001) || (wl20q2*wl20q2 <= 0.0001)))
                {
                    return zcompare(q, w, (q0x+q1x+q2x)/3, (q0y+q1y+q2y)/3);
                }
            
                if (((ql01w0*ql01w0 <= 0.0001) || (ql12w0*ql12w0 <= 0.0001) || (ql20w0*ql20w0 <= 0.0001))
                 && ((ql01w1*ql01w1 <= 0.0001) || (ql12w1*ql12w1 <= 0.0001) || (ql20w1*ql20w1 <= 0.0001))
                 && ((ql01w2*ql01w2 <= 0.0001) || (ql12w2*ql12w2 <= 0.0001) || (ql20w2*ql20w2 <= 0.0001)))
                {
                    return zcompare(q, w, (w0x+w1x+w2x)/3, (w0y+w1y+w2y)/3);
                }
    
            q01w01 = ((wl01q0*wl01q1 < 0.0001) && (ql01w0*ql01w1 < 0.0001));
            q12w01 = ((wl01q1*wl01q2 < 0.0001) && (ql12w0*ql12w1 < 0.0001));
            q20w01 = ((wl01q2*wl01q0 < 0.0001) && (ql20w0*ql20w1 < 0.0001));
            q01w12 = ((wl12q0*wl12q1 < 0.0001) && (ql01w1*ql01w2 < 0.0001));
            q12w12 = ((wl12q1*wl12q2 < 0.0001) && (ql12w1*ql12w2 < 0.0001));
            q20w12 = ((wl12q2*wl12q0 < 0.0001) && (ql20w1*ql20w2 < 0.0001));
            q01w20 = ((wl20q0*wl20q1 < 0.0001) && (ql01w2*ql01w0 < 0.0001));
            q12w20 = ((wl20q1*wl20q2 < 0.0001) && (ql12w2*ql12w0 < 0.0001));
            q20w20 = ((wl20q2*wl20q0 < 0.0001) && (ql20w2*ql20w0 < 0.0001));
            
            count = 0;
            cx = 0;
            cy = 0;
    
            if ((ql01w0 > 0.0001) && (ql12w0 > 0.0001) && (ql20w0 > 0.0001))
            {
                cx += w0x;
                cy += w0y;
                count += 1;
            }
    
            if ((ql01w1 > 0.0001) && (ql12w1 > 0.0001) && (ql20w1 > 0.0001))
            {
                cx += w1x;
                cy += w1y;
                count += 1;
            }
    
            if ((ql01w2 > 0.0001) && (ql12w2 > 0.0001) && (ql20w2 > 0.0001))
            {
                cx += w2x;
                cy += w2y;
                count += 1;
            }
    
            if ((wl01q0 > 0.0001) && (wl12q0 > 0.0001) && (wl20q0 > 0.0001))
            {
                cx += q0x;
                cy += q0y;
                count += 1;
            }
    
            if ((wl01q1 > 0.0001) && (wl12q1 > 0.0001) && (wl20q1 > 0.0001))
            {
                cx += q1x;
                cy += q1y;
                count += 1;
            }
    
            if ((wl01q2 > 0.0001) && (wl12q2 > 0.0001) && (wl20q2 > 0.0001))
            {
                cx += q2x;
                cy += q2y;
                count += 1;
            }
    
            if (q01w01)
            { 
                q01w01d = ql01a*wl01b - ql01b*wl01a;
                if (q01w01d*q01w01d > 0.0001)
                {
                    q01w01x = (ql01b*wl01c - ql01c*wl01b) / q01w01d;
                    q01w01y = (ql01c*wl01a - ql01a*wl01c) / q01w01d;
                    cx += q01w01x;
                    cy += q01w01y;
                    count += 1;
                }
            }
    
            if (q12w01)
            { 
                q12w01d = ql12a*wl01b - ql12b*wl01a;
                if (q12w01d*q12w01d > 0.0001)
                {
                    q12w01x = (ql12b*wl01c - ql12c*wl01b) / q12w01d;
                    q12w01y = (ql12c*wl01a - ql12a*wl01c) / q12w01d;
                    cx += q12w01x;
                    cy += q12w01y;
                    count += 1;
                }
            }
    
            if (q20w01)
            { 
                q20w01d = ql20a*wl01b - ql20b*wl01a;
                if (q20w01d*q20w01d > 0.0001)
                {
                    q20w01x = (ql20b*wl01c - ql20c*wl01b) / q20w01d;
                    q20w01y = (ql20c*wl01a - ql20a*wl01c) / q20w01d;
                    cx += q20w01x;
                    cy += q20w01y;
                    count += 1;
                }
            }
    
            if (q01w12)
            { 
                q01w12d = ql01a*wl12b - ql01b*wl12a;
                if (q01w12d*q01w12d > 0.0001)
                {
                    q01w12x = (ql01b*wl12c - ql01c*wl12b) / q01w12d;
                    q01w12y = (ql01c*wl12a - ql01a*wl12c) / q01w12d;
                    cx += q01w12x;
                    cy += q01w12y;
                    count += 1;
                }
            }
    
            if (q12w12)
            { 
                q12w12d = ql12a*wl12b - ql12b*wl12a;
                if (q12w12d*q12w12d > 0.0001)
                {
                    q12w12x = (ql12b*wl12c - ql12c*wl12b) / q12w12d;
                    q12w12y = (ql12c*wl12a - ql12a*wl12c) / q12w12d;
                    cx += q12w12x;
                    cy += q12w12y;
                    count += 1;
                }
            }
    
            if (q20w12)
            { 
                q20w12d = ql20a*wl12b - ql20b*wl12a;
                if (q20w12d*q20w12d > 0.0001)
                {
                    q20w12x = (ql20b*wl12c - ql20c*wl12b) / q20w12d;
                    q20w12y = (ql20c*wl12a - ql20a*wl12c) / q20w12d;
                    cx += q20w12x;
                    cy += q20w12y;
                    count += 1;
                }
            }
    
            if (q01w20)
            { 
                q01w20d = ql01a*wl20b - ql01b*wl20a;
                if (q01w20d*q01w20d > 0.0001)
                {
                    q01w20x = (ql01b*wl20c - ql01c*wl20b) / q01w20d;
                    q01w20y = (ql01c*wl20a - ql01a*wl20c) / q01w20d;
                    cx += q01w20x;
                    cy += q01w20y;
                    count += 1;
                }
            }
    
            if (q12w20)
            { 
                q12w20d = ql12a*wl20b - ql12b*wl20a;
                if (q12w20d*q12w20d > 0.0001)
                {
                    q12w20x = (ql12b*wl20c - ql12c*wl20b) / q12w20d;
                    q12w20y = (ql12c*wl20a - ql12a*wl20c) / q12w20d;
                    cx += q12w20x;
                    cy += q12w20y;
                    count += 1;
                }
            }
    
            if (q20w20)
            { 
                q20w20d = ql20a*wl20b - ql20b*wl20a;
                if (q20w20d*q20w20d > 0.0001)
                {
                    q20w20x = (ql20b*wl20c - ql20c*wl20b) / q20w20d;
                    q20w20y = (ql20c*wl20a - ql20a*wl20c) / q20w20d;
                    cx += q20w20x;
                    cy += q20w20y;
                    count += 1;
                }
            }
    
            return zcompare(q, w, cx / count, cy / count);
        }
    	
    	
    	
        private function zcompare(a:RenderableListItem, b:RenderableListItem, x:Number, y:Number):int
        {
            az = a.getZ(x, y, _focus);
            bz = b.getZ(x, y, _focus);
    
            if (az > bz)
                return ZOrderDeeper;
            if (az < bz)
                return ZOrderHigher;
    
            return ZOrderSame;
        }
        
		/**
		 * Creates a new <code>student_ar_org_papervision3d_core_render_filter_QuadrantZFilter</code> object.
		 *
		 * @param	maxdelay	[optional]		The maximum time the filter can take to resolve z-depth before timing out.
		 */
        public function student_ar_org_papervision3d_core_render_filter_QuadrantZFilter(maxdelay:int = 60000)
        {
            this.maxdelay = maxdelay;
        }
        
        
		/**
		 * @inheritDoc
		 */
        public override  function filterTree(tree:QuadTree, scene:Scene3D, camera:Camera3D, clip:Clipping):void
        {
            start = getTimer();
            check = 0;
    
            primitives = tree.list();
            _focus = camera.focus;
            turn = 0;
            
            while (primitives.length > 0)
            {
                leftover = new Array();
                for each (pri in primitives)
                {
                    check++;
                    if (check == 10)
                        if (getTimer() - start > maxdelay)
                            return;
                        else
                            check = 0;
					
                    maxZ = pri.maxZ + 1000;
                    minZ = pri.minZ - 1000;
                    maxdeltaZ = 0;
                    
                    rivals = tree.getOverlaps(pri);
                    for each (rival in rivals)
                    {
                        if (rival == pri)
                            continue;
    					
                        switch (zconflict(pri, rival))
                        {
                            case ZOrderIrrelevant:
                            
                                break;
                            case ZOrderDeeper:
                            	if (minZ < rival.screenZ)
                            		minZ = rival.screenZ;
                                break;
                            case ZOrderHigher:
                            	if (maxZ > rival.screenZ)
                            		maxZ = rival.screenZ;
                                break;
                        }
                    }
                    
                     if (maxZ >= pri.screenZ && pri.screenZ >= minZ)
                    {
                        // screenZ still sits between the maxZ and minZ
                        
                        
                    }
                    else  if (maxZ >= minZ)
                    {
                    	//screenZ has to be re-calculated for the new maxZ and minZ
                        pri.screenZ = (maxZ + minZ) / 2;
                    }
                    else
                    {
                    	
                    	//there is no value for screenZ, triangle is flagged for tesselation
                        if (turn % 3 == 2)
                        {
                            parts = pri.quarter(camera.focus);
                            
                            if (parts != null){
                            	
                            
                                tree.remove(pri);
                                for each (part in parts)
                                {
                                    //part.screenZ = pri.screenZ;
                                    leftover.push(part);
                                    tree.add(part);
                                }
                            }
                        }
                        else{
                        	
                            leftover.push(pri);
                        }
                    }
                }
                primitives = leftover;
                turn += 1;
                if (turn == 20)
                    break;
            }
        }
        
		/**
		 * Used to trace the values of a filter.
		 * 
		 * @return A string representation of the filter object.
		 */
        public function toString():String
        {
            return "student_ar_org_papervision3d_core_render_filter_QuadrantZFilter" + ((maxdelay == 60000) ? "" : "("+maxdelay+"ms)");
        }
    }
}