#include "alien.h"

#include <cmath>

Alien::Alien(GameData * AlienData, float alienspeed)
{
	data = AlienData;
	Speed = alienspeed;
	TmpCells = new int*[data->size.width()];
	for (int i = 0; i < data->size.width(); i++)
		TmpCells[i] = new int[data->size.height()];
	Position.pnt = data->start*data->cellsize;
	RecreatePath();
}


bool Alien::RecreatePath()
{
	for (int i = 0; i < data->size.width(); i++)
	{
		for (int j = 0; j < data->size.height(); j++)
		{
			if (data->Cells[i][j] < 0 ) TmpCells[i][j] = -1;
			else TmpCells[i][j] = 0;
		}
	}
	QPointF tp;
	QPoint start;
	QVector<QPoint> srcPath;
	QVector<QPointF> tmpPath;
	PathIndex = 1;
	start.setX(qRound(Position.pnt.x()/(float)data->cellsize));
	start.setY(qRound(Position.pnt.y()/(float)data->cellsize));
	srcPath = InvWaveTrace(data->finish,WaveTrace(start,data->finish));
	for (int i=0; i<srcPath.size();i++)
	{
		data->Cells[srcPath[i].x()][srcPath[i].y()] = 1;
		tmpPath.push_back(QPointF(srcPath[i]));
	}
	srcPath.clear();
	//qDebug() << tmpPath.size();
	if (!tmpPath.isEmpty())
	{
		for (int j=0; j<4; j++)
		{
			path.clear();
			tp = tmpPath[0];
			path.push_back(tp);
			for (int i = 0; i < tmpPath.size() - 1; i++)
			{
				tp.setX((tmpPath[i].x() + tmpPath[i + 1].x()) / 2.0);
				tp.setY((tmpPath[i].y() + tmpPath[i + 1].y()) / 2.0);
				path.push_back(tp);
			}
			tp = tmpPath[tmpPath.size() - 1];
			path.push_back(tp);
			tmpPath = path;
		}
		tmpPath.clear();
		if (path.size() > 10)
		{
			path.remove(1);
			path.remove(1);
			path.remove(path.size()-2);
			path.remove(path.size()-2);
		}
		return true;
	}
	return false;
}


void Alien::update()
{
	float tmpdx,tmpdy,angl,arctg = 0;
	tmpdx = Position.pnt.x() - path[PathIndex].x()*data->cellsize;
	tmpdy = Position.pnt.y() - path[PathIndex].y()*data->cellsize;
	while (std::sqrt(tmpdx*tmpdx +tmpdy*tmpdy) < 2*Speed*data->cellsize)
	{
		PathIndex++;
		if (PathIndex >= path.size()) PathIndex = 0;
		tmpdx = Position.pnt.x() - path[PathIndex].x()*data->cellsize;
		tmpdy = Position.pnt.y() - path[PathIndex].y()*data->cellsize;
		//qDebug() << "next";
	}
	arctg = std::atan(tmpdx/tmpdy);
	if (tmpdy < 0) arctg=arctg+3.1416f;
	angl = 180.0f*(-arctg)/3.1416f;
	//if (qAbs(Position.angle-angl) > 10) Position.angle = 5*angl/qAbs(angl);
	//else 
	Position.angle = angl;
	//qDebug() << "[" << PathIndex << ";" << PicIndex << "]" << "angle:" << Position.angle << "arctg:" << arctg << "Pos:" << Position.pnt;
	Position.pnt.setX(Position.pnt.x()
					  -Speed*(float)data->cellsize*std::sin(arctg));
	Position.pnt.setY(Position.pnt.y()
					  -Speed*(float)data->cellsize*std::cos(arctg));
	PicIndex++;
}


/*bool Aliens::PathIntersect(Alien* Al, Rectangle rect)
{
	//PathIntersect = False
	for (int i = Al->PathIndex; i<=Al->path.size(); i++) // To UBound(Al.path(), 1)
		if (Al->path[i].x + 0.5 >= rect.x0 - 1 && Al->path[i].x + 0.5 <= rect.x1 + 1)
			if (Al->path[i].y + 0.5 >= rect.y0 - 1 && Al->path[i].y + 0.5 <= rect.y1 + 1)
				return true; //PathIntersect = True //Exit Function
	return false;
}*/


int Alien::WaveTrace(QPoint start, QPoint finish)
{
	bool stop = false;
	int step = 2;
	QPoint cp, tp;
	QRect fr(0, 0, data->size.width(), data->size.height());
	QVector<QPoint> tmpp, curp;
	cp = start;
	curp.push_back(cp);
	TmpCells[cp.x()][cp.y()] = 1;
	//qDebug() << "trace";
	while (!stop) {
		tmpp = curp;
		curp.clear();
		stop = true;
		for (int i = 0; i < tmpp.size(); i++) {
			cp = tmpp[i];
			if (cp == finish) {
				TmpCells[cp.x()][cp.y()] = step;
				//qDebug() << "trace done!";
				return step;
			}
			tp.setX(cp.x() - 1);
			tp.setY(cp.y());
			if (fr.contains(tp) && TmpCells[tp.x()][tp.y()] == 0) {
				TmpCells[tp.x()][tp.y()] = step;
				curp.push_back(tp);
				stop = false;
			}
			tp.setX(cp.x() + 1);
			if (fr.contains(tp) && TmpCells[tp.x()][tp.y()] == 0) {
				TmpCells[tp.x()][tp.y()] = step;
				curp.push_back(tp);
				stop = false;
			}
			tp.setX(cp.x());
			tp.setY(cp.y() - 1);
			if (fr.contains(tp) && TmpCells[tp.x()][tp.y()] == 0) {
				TmpCells[tp.x()][tp.y()] = step;
				curp.push_back(tp);
				stop = false;
			}
			tp.setY(cp.y() + 1);
			if (fr.contains(tp) && TmpCells[tp.x()][tp.y()] == 0) {
				TmpCells[tp.x()][tp.y()] = step;
				curp.push_back(tp);
				stop = false;
			}
		}
		step++;
	}
	qDebug() << "trace false";
	return -1;
}


QVector<QPoint> Alien::InvWaveTrace(QPoint finish, int cnt)
{
	QPoint wp, Ppnt;
	QVector<QPoint> alpath;
	if (cnt < 2) return alpath;
	int Ind, c, xpp, ypp, xnn, ynn;
	unsigned char chk;
	Ppnt = wp = finish;
	xnn=0;
	xpp=0;
	ynn=0;
	ypp=0;
	cnt--;
	alpath.push_front(Ppnt);
	while (cnt > 1)
	{
		cnt--;
		chk = 0;
		Ind = 0;
		c = 0;
		if (wp.x() - 1 >= 0 && TmpCells[wp.x()-1][wp.y()] == cnt)
		{
			chk = chk | 0x01;
			c++;
		}
		if (wp.x() + 1 < data->size.width() && TmpCells[wp.x()+1][wp.y()] == cnt)
		{
			chk = chk | 0x02;
			c++;
		}
		if (wp.y() - 1 >= 0 && TmpCells[wp.x()][wp.y()-1] == cnt)
		{
			chk = chk | 0x04;
			c++;
		}
		if (wp.y() + 1 < data->size.height() && TmpCells[wp.x()][wp.y()+1] == cnt)
		{
			chk = chk | 0x08;
			c++;
		}
		if (c == 0 || chk == 0) qDebug() << "ERROR!!!";
		if (c > 1)
		{
			if ((chk & 0x01)==0x01 && (chk & 0x04)==0x04)
			{
				if (xnn <= ynn && Ind == 0){
					wp.rx()--;
					xnn++;
					if (xnn == ynn) xnn++;
					Ind = 1;
				} else if (Ind == 0) {
					wp.ry()--;
					ynn++;
					ynn++;
					Ind = 1;
				}
			}
			if ((chk & 0x02)==0x02 && (chk & 0x04)==0x04)
			{
				if (xpp <= ynn && Ind == 0){
					wp.rx()++;
					xpp++;
					if (xpp == ynn) xpp++;
					Ind = 1;
				} else if (Ind == 0) {
					wp.ry()--;
					ynn++;
					ynn++;
					Ind = 1;
				}
			}
			if ((chk & 0x01)==0x01 && (chk & 0x08)==0x08)
			{
				if (xnn <= ypp && Ind == 0){
					wp.rx()--;
					xnn++;
					if (xnn == ypp) xnn++;
					Ind = 1;
				} else if (Ind == 0) {
					wp.ry()++;
					ypp++;
					ypp++;
					Ind = 1;
				}
			}
			if ((chk & 0x02)==0x02 && (chk & 0x08)==0x08)
			{
				if (xpp <= ypp && Ind == 0){
					wp.rx()++;
					xpp++;
					if (xpp == ypp) xpp++;
					Ind = 1;
				} else if (Ind == 0) {
					wp.ry()++;
					ypp++;
					ypp++;
					Ind = 1;
				}
			}
		}
		if (c == 1 || Ind == 0)
		{
			xnn=0;
			xpp=0;
			ynn=0;
			ypp=0;
			if ((chk & 0x01)==0x01) {
				wp.rx()--;
				xnn++;
			}
			else if ((chk & 0x02)==0x02) {
				wp.rx()++;
				xpp++;
			}
			else if ((chk & 0x04)==0x04) {
				wp.ry()--;
				ynn++;
			}
			else if ((chk & 0x08)==0x08) {
				wp.ry()++;
				ypp++;
			}
		}
		Ppnt = wp;
		alpath.push_front(Ppnt);
	}
	return alpath;
}