/*
 * Hot Beverage Companion – desktop application gtk ui
 *
 * Copyright (C) 2018 Gediminas Jakutis
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; version 2.1
 * of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <gtk/gtk.h>
#include <time.h>
#include <string.h>
#include "util.h"
#include "gtk.h"

struct settings {
	int nd;
	struct timespec period;
};

struct gtkui {
	GtkBuilder *builder;
	GObject *window;
	GObject *tempvalue;
	GObject *resistance;
	GObject *voltage;
	GObject *reslabel;
	GObject *voltlabel;
	GObject *showmorebutton;
	GObject *button_on;
	GObject *button_off;
	GObject *ticker;
	GError *error;
	int showmore;
};

static struct settings settings;
static struct gtkui gtkui;

static int gtkui_update(void *data);
static void gtkui_die(void *data);
static void gtkui_togglemore(void);

int gtkui_init(int *argc, char ***argv, int nd, struct timespec period)
{
	int ret = A_OK;

	settings.nd = nd;
	settings.period = period;

	if (!gtk_init_check(argc, argv)) {
		ret = ERROR;
		goto fail;
	}

	gtkui.builder = gtk_builder_new();

	if (!gtk_builder_add_from_file(gtkui.builder, "gtklayout.ui", &gtkui.error)) {
		ret = ERROR;
		goto fail;
	}

	gtkui.window = gtk_builder_get_object(gtkui.builder, "window");
	gtkui.tempvalue = gtk_builder_get_object(gtkui.builder, "tempvalue");
	gtkui.resistance = gtk_builder_get_object(gtkui.builder, "resistance");
	gtkui.voltage = gtk_builder_get_object(gtkui.builder, "voltage");
	gtkui.reslabel = gtk_builder_get_object(gtkui.builder, "reslabel");
	gtkui.voltlabel = gtk_builder_get_object(gtkui.builder, "voltlabel");
	gtkui.showmorebutton = gtk_builder_get_object(gtkui.builder, "showmore");
	gtkui.button_on = gtk_builder_get_object(gtkui.builder, "button_on");
	gtkui.button_off = gtk_builder_get_object(gtkui.builder, "button_off");
	gtkui.ticker = gtk_builder_get_object(gtkui.builder, "ticker");
	g_signal_connect(gtkui.window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
	g_signal_connect(gtkui.showmorebutton, "toggled", G_CALLBACK(gtkui_togglemore), NULL);
	gtkui.showmore = 1; /* we are setting this so we can toggle this off on the following call */
	gtkui_togglemore();

fail:
	return ret;
}
int gtkui_loop(void)
{
	int ret;
	g_timeout_add_full(G_PRIORITY_DEFAULT, settings.period.tv_nsec / (1000 * 1000), gtkui_update, &ret, gtkui_die);
	gtk_main();

	return ret;
}

static int gtkui_update(void *data)
{
	static const char ticker[] = "|/-\\";
	static const char waitmsg[] = "Waiting.";
	static int statechange = 1;
	static struct tempmodule_state state;
	char textbuf[32];
	int *ret;

	ret = data;
	*ret = refresh_data(settings.nd, &state);
	if (*ret == A_OK) {
		textbuf[0] = ticker[state.sequence % strlen(ticker)];
		textbuf[1] = '\0';
		gtk_label_set_text(GTK_LABEL(gtkui.ticker), textbuf);
		sprintf(textbuf, "%.1f°C", state.temperature);
		gtk_label_set_text(GTK_LABEL(gtkui.tempvalue), textbuf);
		sprintf(textbuf, "%hdΩ", state.resistance);
		gtk_label_set_text(GTK_LABEL(gtkui.resistance), textbuf);
		sprintf(textbuf, "%.3fV", state.voltage);
		gtk_label_set_text(GTK_LABEL(gtkui.voltage), textbuf);
		statechange = 1;
	} else if (*ret == DEAD && statechange) {
		gtk_label_set_text(GTK_LABEL(gtkui.tempvalue), waitmsg);
		gtk_label_set_text(GTK_LABEL(gtkui.resistance), waitmsg);
		gtk_label_set_text(GTK_LABEL(gtkui.voltage), waitmsg);
		statechange = 0;
	}

	return *ret != ERROR;
}

static void gtkui_die(void *data)
{
	(void) data; /* silence unused variable warning */
	gtk_main_quit();
	return;
}

static void gtkui_togglemore(void)
{
	gtkui.showmore = !gtkui.showmore;
	gtkui.showmore ? gtk_button_set_image(GTK_BUTTON(gtkui.showmorebutton), GTK_WIDGET(gtkui.button_on)) :
				gtk_button_set_image(GTK_BUTTON(gtkui.showmorebutton), GTK_WIDGET(gtkui.button_off));
	gtk_widget_set_visible (GTK_WIDGET(gtkui.resistance), gtkui.showmore);
	gtk_widget_set_visible (GTK_WIDGET(gtkui.voltage), gtkui.showmore);
	gtk_widget_set_visible (GTK_WIDGET(gtkui.reslabel), gtkui.showmore);
	gtk_widget_set_visible (GTK_WIDGET(gtkui.voltlabel), gtkui.showmore);
}