/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <X11/Xlib.h>

#include "draw.h"
#include "util.h"

Draw *
draw_create(Display *dpy, int screen, Window win, unsigned int w, unsigned int h) {
	Draw *draw = (Draw *)calloc(1, sizeof(Draw));
	draw->dpy = dpy;
	draw->screen = screen;
	draw->win = win;
	draw->w = w;
	draw->h = h;
	draw->drawable = XCreatePixmap(dpy, win, w, h, DefaultDepth(dpy, screen));
	draw->gc = XCreateGC(dpy, win, 0, NULL);
	XSetLineAttributes(dpy, draw->gc, 1, LineSolid, CapButt, JoinMiter);
	return draw;
}

void
draw_resize(Draw *draw, unsigned int w, unsigned int h) {
	if(!draw)
		return;
	draw->w = w;
	draw->h = h;
	XFreePixmap(draw->dpy, draw->drawable);
	draw->drawable = XCreatePixmap(draw->dpy, draw->win, w, h, DefaultDepth(draw->dpy, draw->screen));
}

void
draw_free(Draw *draw) {
	XFreePixmap(draw->dpy, draw->drawable);
	XFreeGC(draw->dpy, draw->gc);
	free(draw);
}

Fnt *
draw_font_create(Draw *draw, const char *fontname) {
	Fnt *font;
	char *def, **missing;
	int n;

	if(!draw)
		return NULL;
	font = (Fnt *)calloc(1, sizeof(Fnt));
	font->set = XCreateFontSet(draw->dpy, fontname, &missing, &n, &def);
	if(missing) {
		while(n--)
			fprintf(stderr, "draw: missing fontset: %s\n", missing[n]);
		XFreeStringList(missing);
	}
	if(font->set) {
		XFontStruct **xfonts;
		char **font_names;

		XExtentsOfFontSet(font->set);
		n = XFontsOfFontSet(font->set, &xfonts, &font_names);
		while(n--) {
			font->ascent = MAX(font->ascent, (*xfonts)->ascent);
			font->descent = MAX(font->descent,(*xfonts)->descent);
			xfonts++;
		}
	}
	else {
		if(!(font->xfont = XLoadQueryFont(draw->dpy, fontname))
		&& !(font->xfont = XLoadQueryFont(draw->dpy, "fixed")))
			die("error, cannot load font: '%s'\n", fontname);
		font->ascent = font->xfont->ascent;
		font->descent = font->xfont->descent;
	}
	font->h = font->ascent + font->descent;
	return font;
}

void
draw_font_free(Draw *draw, Fnt *font) {
	if(!draw || !font)
		return;
	if(font->set)
		XFreeFontSet(draw->dpy, font->set);
	else
		XFreeFont(draw->dpy, font->xfont);
	free(font);
}

Col *
draw_col_create(Draw *draw, const char *colname) {
	Col *col = (Col *)calloc(1, sizeof(Col));
	Colormap cmap = DefaultColormap(draw->dpy, draw->screen);
	XColor color;

	if(!XAllocNamedColor(draw->dpy, cmap, colname, &color, &color))
		die("error, cannot allocate color '%s'\n", colname);
	col->rgb = color.pixel;
	return col;
}

void
draw_col_free(Draw *draw, Col *col) {
	if(!col)
		return;
	free(col);
}

void
draw_setfont(Draw *draw, Fnt *font) {
	if(!draw || !font)
		return;
	draw->font = font;
}

void
draw_setfg(Draw *draw, Col *col) {
	if(!draw || !col) 
		return;
	draw->fg = col;
}

void
draw_setbg(Draw *draw, Col *col) {
	if(!draw || !col)
		return;
	draw->bg = col;
}

void
draw_rect(Draw *draw, int x, int y, unsigned int w, unsigned int h) {
	if(!draw)
		return;
	/* TODO: draw the rectangle */
}

void
draw_text(Draw *draw, int x, int y, const char *text) {
	if(!draw)
		return;
	/* TODO: draw the text */
}

void
draw_map(Draw *draw, int x, int y, unsigned int w, unsigned int h) {
	if(!draw)
		return;
	/* TODO: map the draw contents in the region */
}

void
draw_getextents(Draw *draw, const char *text, TextExtents *extents) {
	if(!draw || !extents)
		return;
	/* TODO: get extents */
}