#include "config.h"
#include "render.h"
#include "plat.h"
#include "rcache.h"
#include "ui.h"

Rectangle rectcut_left(Rectangle* l, int a) {
	Rectangle r;
	r.x = l->x;
	r.y = l->y;
	r.w = a;
	r.h = l->h;
	l->x += a;
	l->w -= a;
	return r;
}

Rectangle rectcut_right(Rectangle* l, int a) {
	Rectangle r;
	r.x = l->x + l->w - a;
	r.y = l->y;
	r.w = a;
	r.h = l->h;
	l->w -= a;
	return r;
}

Rectangle rectcut_top(Rectangle* l, int a) {
	Rectangle r;
	r.x = l->x;
	r.y = l->y;
	r.w = l->w;
	r.h = a;
	l->y += a;
	l->h -= a;
	return r;
}

Rectangle rectcut_bottom(Rectangle* l, int a) {
	Rectangle r;
	r.x = l->x;
	r.y = l->y + l->h - a;
	r.w = l->w;
	r.h = a;
	l->h -= a;
	return r;
}

Rectangle shrink_rect(const Rectangle* l, int a) {
	Rectangle r;
	int a2 = a * 2;
	r.x = l->x + a;
	r.y = l->y + a;
	r.w = l->w - a2;
	r.h = l->h - a2;
	return r;
}

Rectangle centre_rect(
	const Rectangle* l,
	const Rectangle* t
) {
	Rectangle r;
	r.x = l->x + l->w / 2 - t->w / 2;
	r.y = l->y + l->h / 2 - t->h / 2;
	r.w = t->w;
	r.h = t->h;
	return r;
}

void init_ui(UI* u, Font* f) {
	u->font = f;
}

void ui_begin(UI* u, Rectangle* l) {
	(void)u;
	l->x = 0;
	l->y = 0;
	l->w = get_render_w();
	l->h = get_render_h();
}

void ui_end(UI* u) {
	(void)u;
}

void ui_label(
	UI* u,
	const Rectangle* l,
	const char* text
) {
	rc_add_cmd_rfont_text_col(
		u->font,
		l->x,
		l->y,
		text,
		theme_text_colour
	);
}

int ui_button(
	UI* u,
	const Rectangle* r,
	const char* label
) {
	Rectangle o, t;
	Colour c;
	int h;
	o = shrink_rect(r, theme_outline_width);
	h = point_rect_overlap(
		&o,
		get_mouse_x(),
		get_mouse_y()
	);
	if (h) {
		if (mbtn_pressed(mbtn_left))
			c = theme_active_colour;
		else
			c = theme_hovered_colour;
	} else
		c = theme_background_colour;
	rc_add_cmd_rect(r, theme_outline_colour);
	rc_add_cmd_rect(&o, c);
	t = text_rect(u->font, label);
	o = centre_rect(&o, &t);
	rc_add_cmd_rfont_text_col(
		u->font,
		o.x,
		o.y,
		label,
		theme_text_colour
	);
	return h && mbtn_just_released(mbtn_left);
}

void ui_container(
	UI* u,
	const Rectangle* l,
	Rectangle* r,
	const Rectangle* c
) {
	Rectangle o, cl;
	(void)u;
	rc_add_cmd_rect(l, theme_outline_colour);
	o = shrink_rect(l, theme_outline_width);
	rc_add_cmd_rect(&o, theme_background_colour);
	cl = o;
	cl.w += cl.x;
	cl.h += cl.y;
	rc_add_cmd_clip(&cl);
	*r = shrink_rect(&o, theme_padding);
}