#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <math.h>
#include <vga.h>
#include "wllib.h"

#define SAFE_BORDER (4)
#define SIZE_MIN (16)

#define DEFAULT_MODE G320x200x256

extern void drawgfx(void);

long xmin,xmax,ymin,ymax;
int winx,winy,iniline,minimax=1,xcur,ycur;
float coefx,coefy;

char *pname;

void wl_line(long x,long y)
{
	if (iniline) {
		iniline=0;
		if (minimax) { xmin=xmax=x; ymin=ymax=y; }
		else {
			xcur=rint(coefx*(x-xmin))+SAFE_BORDER;
			ycur=winy-SAFE_BORDER-rint(coefy*(y-ymin));
			}
		}
	else {
		if (minimax) {
			if (x<xmin) xmin=x; if (x>xmax) xmax=x;
			if (y<ymin) ymin=y; if (y>ymax) ymax=y;
			}
		else {
int xcur2,ycur2;
			vga_drawline(xcur,ycur,
					xcur2=rint(coefx*(x-xmin))+SAFE_BORDER,ycur2=winy-SAFE_BORDER-rint(coefy*(y-ymin)));
			xcur=xcur2; ycur=ycur2;
			}
		}
}


void wl_done(void)
{
	iniline=1; drawgfx();
	minimax=0;
	if (xmax==xmin) xmax++;
	if (ymax==ymin) ymax++;
	if (iniline) return;
	coefx=(float)(winx-2*SAFE_BORDER-1)/(xmax-xmin);
	coefy=(float)(winy-2*SAFE_BORDER-1)/(ymax-ymin);
	iniline=1; drawgfx();
	vga_getch();
}

static void wl_cleanup(void)
{
	vga_setmode(TEXT);
}

void wl_init(int *argcp,char **argv,const char *class)
{
int i,j;
char *s=NULL;
int mode=-1;
	if ((pname=rindex(*argv,'/'))) pname++;
	else pname=*argv;
	for (j=i=1;i<*argcp;i++)
		if (!strcmp(argv[i],"-m")||!strcmp(argv[i],"--mode")) {
			s=argv[++i]; j++;
			}
		else argv[j++]=argv[i];
	if (s) mode=vga_getmodenumber(s);
	if (mode==-1) if ((mode=vga_getdefaultmode())==-1) mode=DEFAULT_MODE;
	if (vga_setmode(mode)==-1) {
		fprintf(stderr,"%s: Mode \"%s\" [%d] not available!\n",pname,
				vga_getmodename(mode),mode);
		exit(EXIT_FAILURE);
		}
	atexit(wl_cleanup);
	winx=vga_getxdim(); winy=vga_getydim();
	vga_setcolor(vga_white());
}