#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>
#include "../libgeometry/geometry.h"

RFrame worldrf;

void resized(void);

Point
toscreen(Point2 p)
{
	p = invrframexform(p, worldrf);
	return Pt(p.x,p.y);
}

Point2
fromscreen(Point p)
{
	return rframexform(Pt2(p.x,p.y,1), worldrf);
}

void
redraw(void)
{
	lockdisplay(display);
	draw(screen, screen->r, display->black, nil, ZP);
	line(screen, toscreen(Pt2(0,512,1)), toscreen(Pt2(0,-512,1)), 0, 0, 0, display->white, ZP);
	line(screen, toscreen(Pt2(512,0,1)), toscreen(Pt2(-512,0,1)), 0, 0, 0, display->white, ZP);
	flushimage(display, 1);
	unlockdisplay(display);
}

void
rmb(Mousectl *, Keyboardctl *)
{
}

void
lmb(Mousectl *mc, Keyboardctl *)
{
	Point2 mpos;

	mpos = fromscreen(mc->xy);
	fprint(2, "%v\n", mpos);
}

void
mouse(Mousectl *mc, Keyboardctl *kc)
{
	if((mc->buttons&1) != 0)
		lmb(mc, kc);
	if((mc->buttons&4) != 0)
		rmb(mc, kc);
}

void
key(Rune r)
{
	switch(r){
	case Kdel:
	case 'q':
		threadexitsall(nil);
	}
}

void
usage(void)
{
	fprint(2, "usage: %s\n", argv0);
	exits("usage");
}

void
threadmain(int argc, char *argv[])
{
	Mousectl *mc;
	Keyboardctl *kc;
	Rune r;

	GEOMfmtinstall();
	ARGBEGIN{
	default: usage();
	}ARGEND;
	if(argc > 0)
		usage();

	if(newwindow(nil) < 0)
		sysfatal("newwindow: %r");
	if(initdraw(nil, nil, nil) < 0)
		sysfatal("initdraw: %r");
	if((mc = initmouse(nil, screen)) == nil)
		sysfatal("initmouse: %r");
	if((kc = initkeyboard(nil)) == nil)
		sysfatal("initkeyboard: %r");

	worldrf.p = Pt2(screen->r.min.x+Dx(screen->r)/2,screen->r.max.y-Dy(screen->r)/2,1);
	worldrf.bx = Vec2(1, 0);
	worldrf.by = Vec2(0,-1);

	display->locking = 1;
	unlockdisplay(display);
	redraw();

	for(;;){
		enum { MOUSE, RESIZE, KEYBOARD };
		Alt a[] = {
			{mc->c, &mc->Mouse, CHANRCV},
			{mc->resizec, nil, CHANRCV},
			{kc->c, &r, CHANRCV},
			{nil, nil, CHANEND}
		};

		switch(alt(a)){
		case MOUSE:
			mouse(mc, kc);
			break;
		case RESIZE:
			resized();
			break;
		case KEYBOARD:
			key(r);
			break;
		}

		redraw();
	}
}

void
resized(void)
{
	lockdisplay(display);
	if(getwindow(display, Refnone) < 0)
		sysfatal("couldn't resize");
	unlockdisplay(display);
	worldrf.p = Pt2(screen->r.min.x+Dx(screen->r)/2,screen->r.max.y-Dy(screen->r)/2,1);
	redraw();
}