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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include <thread.h>
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#include <mouse.h>
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#include <frame.h>
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static
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int
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region(int a, int b)
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{
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	if(a < b)
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		return -1;
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	if(a == b)
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		return 0;
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	return 1;
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}
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void
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frselect(Frame *f, Mousectl *mc)	/* when called, button 1 is down */
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{
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	ulong p0, p1, q;
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	Point mp, pt0, pt1, qt;
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	int reg, b, scrled;
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	mp = mc->xy;
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	b = mc->buttons;
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	f->modified = 0;
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	frdrawsel(f, frptofchar(f, f->p0), f->p0, f->p1, 0);
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	p0 = p1 = frcharofpt(f, mp);
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	f->p0 = p0;
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	f->p1 = p1;
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	pt0 = frptofchar(f, p0);
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	pt1 = frptofchar(f, p1);
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	frdrawsel(f, pt0, p0, p1, 1);
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	reg = 0;
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	do{
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		scrled = 0;
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		if(f->scroll){
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			if(mp.y < f->r.min.y){
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				(*f->scroll)(f, -(f->r.min.y-mp.y)/(int)f->font->height-1);
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				p0 = f->p1;
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				p1 = f->p0;
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				scrled = 1;
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			}else if(mp.y > f->r.max.y){
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				(*f->scroll)(f, (mp.y-f->r.max.y)/(int)f->font->height+1);
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				p0 = f->p0;
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				p1 = f->p1;
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				scrled = 1;
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			}
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			if(scrled){
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				if(reg != region(p1, p0))
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					q = p0, p0 = p1, p1 = q;	/* undo the swap that will happen below */
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				pt0 = frptofchar(f, p0);
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				pt1 = frptofchar(f, p1);
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				reg = region(p1, p0);
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			}
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		}
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		q = frcharofpt(f, mp);
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		if(p1 != q){
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			if(reg != region(q, p0)){	/* crossed starting point; reset */
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				if(reg > 0)
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					frdrawsel(f, pt0, p0, p1, 0);
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				else if(reg < 0)
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					frdrawsel(f, pt1, p1, p0, 0);
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				p1 = p0;
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				pt1 = pt0;
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				reg = region(q, p0);
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				if(reg == 0)
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					frdrawsel(f, pt0, p0, p1, 1);
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			}
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			qt = frptofchar(f, q);
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			if(reg > 0){
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				if(q > p1)
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					frdrawsel(f, pt1, p1, q, 1);
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				else if(q < p1)
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					frdrawsel(f, qt, q, p1, 0);
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			}else if(reg < 0){
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				if(q > p1)
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					frdrawsel(f, pt1, p1, q, 0);
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				else
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					frdrawsel(f, qt, q, p1, 1);
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			}
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			p1 = q;
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			pt1 = qt;
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		}
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		f->modified = 0;
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		if(p0 < p1) {
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			f->p0 = p0;
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			f->p1 = p1;
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		}
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		else {
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			f->p0 = p1;
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			f->p1 = p0;
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		}
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		if(scrled)
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			(*f->scroll)(f, 0);
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		flushimage(f->display, 1);
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		if(!scrled)
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			readmouse(mc);
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		mp = mc->xy;
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	}while(mc->buttons == b);
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}
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void
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frselectpaint(Frame *f, Point p0, Point p1, Image *col)
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{
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	int n;
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	Point q0, q1;
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	q0 = p0;
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	q1 = p1;
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	q0.y += f->font->height;
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	q1.y += f->font->height;
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	n = (p1.y-p0.y)/f->font->height;
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	if(f->b == nil)
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		drawerror(f->display, "frselectpaint b==0");
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	if(p0.y == f->r.max.y)
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		return;
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	if(n == 0)
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		draw(f->b, Rpt(p0, q1), col, nil, ZP);
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	else{
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		if(p0.x >= f->r.max.x)
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			p0.x = f->r.max.x-1;
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		draw(f->b, Rect(p0.x, p0.y, f->r.max.x, q0.y), col, nil, ZP);
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		if(n > 1)
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			draw(f->b, Rect(f->r.min.x, q0.y, f->r.max.x, p1.y),
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				col, nil, ZP);
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		draw(f->b, Rect(f->r.min.x, p1.y, q1.x, q1.y),
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			col, nil, ZP);
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	}
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}