/*
 * crystfel_gui.c
 *
 * CrystFEL's main graphical user interface
 *
 * Copyright © 2020 Deutsches Elektronen-Synchrotron DESY,
 *                  a research centre of the Helmholtz Association.
 *
 * Authors:
 *   2020 Thomas White <taw@physics.org>
 *
 * This file is part of CrystFEL.
 *
 * CrystFEL is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * CrystFEL 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with CrystFEL.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdarg.h>
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms-compat.h>
#include <assert.h>

#include <datatemplate.h>

#include "crystfelimageview.h"


static void show_help(const char *s)
{
	printf("Syntax: %s\n\n", s);
	printf(
"CrystFEL graphical user interface.\n"
"\n"
" -h, --help              Display this help message.\n"
"     --version           Print CrystFEL version number and exit.\n"

);
}


struct crystfelproject {

	GtkWidget *window;
	GtkUIManager *ui;
	GtkActionGroup *action_group;

	GtkWidget *imageview;
	GtkWidget *icons;      /* Drawing area for task icons */
	GtkWidget *report;     /* Text view at the bottom for messages */

};


static gboolean destroy_sig(GtkWidget *da, struct crystfelproject *proj)
{
	gtk_main_quit();
	return FALSE;
}


static void add_ui_sig(GtkUIManager *ui, GtkWidget *widget,
                       GtkContainer *container)
{
	gtk_box_pack_start(GTK_BOX(container), widget, FALSE, FALSE, 0);
	if ( GTK_IS_TOOLBAR(widget) ) {
		gtk_toolbar_set_show_arrow(GTK_TOOLBAR(widget), TRUE);
	}
}


static gint quit_sig(GtkWidget *widget, struct crystfelproject *proj)
{
	gtk_main_quit();
	return FALSE;
}


static gint about_sig(GtkWidget *widget, struct crystfelproject *proj)
{
	GtkWidget *window;

	const gchar *authors[] = {
		"Thomas White <taw@physics.org>",
		NULL
	};

	window = gtk_about_dialog_new();
	gtk_window_set_transient_for(GTK_WINDOW(window), GTK_WINDOW(proj->window));

	gtk_about_dialog_set_program_name(GTK_ABOUT_DIALOG(window),
	        "CrystFEL graphical user interface");
	gtk_about_dialog_set_version(GTK_ABOUT_DIALOG(window), CRYSTFEL_VERSIONSTRING);
	gtk_about_dialog_set_copyright(GTK_ABOUT_DIALOG(window),
		"© 2020 Deutsches Elektronen-Synchrotron DESY, "
		"a research centre of the Helmholtz Association.");
	gtk_about_dialog_set_website(GTK_ABOUT_DIALOG(window),
		"https://www.desy.de/~twhite/crystfel");
	gtk_about_dialog_set_authors(GTK_ABOUT_DIALOG(window), authors);

	g_signal_connect(window, "response", G_CALLBACK(gtk_widget_destroy),
			 NULL);

	gtk_widget_show_all(window);

	return 0;
}


static void add_menu_bar(struct crystfelproject *proj, GtkWidget *vbox)
{
	GError *error = NULL;

	const char *ui = "<ui> <menubar name=\"cellwindow\">"
		"<menu name=\"file\" action=\"FileAction\">"
		"	<menuitem name=\"quit\" action=\"QuitAction\" />"
		"</menu>"
		"<menu name=\"tools\" action=\"ToolsAction\" >"
		"</menu>"
		"<menu name=\"help\" action=\"HelpAction\">"
		"	<menuitem name=\"about\" action=\"AboutAction\" />"
		"</menu>"
		"</menubar></ui>";

	GtkActionEntry entries[] = {

		{ "FileAction", NULL, "_File", NULL, NULL, NULL },
		{ "QuitAction", GTK_STOCK_QUIT, "_Quit", NULL, NULL,
			G_CALLBACK(quit_sig) },

		{ "ToolsAction", NULL, "_Tools", NULL, NULL, NULL },

		{ "HelpAction", NULL, "_Help", NULL, NULL, NULL },
		{ "AboutAction", GTK_STOCK_ABOUT, "_About", NULL, NULL,
			G_CALLBACK(about_sig) },

	};
	guint n_entries = G_N_ELEMENTS(entries);

	proj->action_group = gtk_action_group_new("cellwindow");
	gtk_action_group_add_actions(proj->action_group, entries, n_entries, proj);

	proj->ui = gtk_ui_manager_new();
	gtk_ui_manager_insert_action_group(proj->ui, proj->action_group, 0);
	g_signal_connect(proj->ui, "add_widget", G_CALLBACK(add_ui_sig), vbox);
	if ( gtk_ui_manager_add_ui_from_string(proj->ui, ui, -1, &error) == 0 )
	{
		fprintf(stderr, "Error loading message window menu bar: %s\n",
			error->message);
		return;
	}

	gtk_window_add_accel_group(GTK_WINDOW(proj->window),
				   gtk_ui_manager_get_accel_group(proj->ui));
	gtk_ui_manager_ensure_update(proj->ui);
}


int main(int argc, char *argv[])
{
	int c;
	struct crystfelproject proj;
	GtkWidget *vbox;
	GtkWidget *vpaned;
	GtkWidget *hpaned;
	GtkWidget *scroll;
	GtkWidget *frame;
	DataTemplate *dtempl;

	/* Long options */
	const struct option longopts[] = {
		{"help",               0, NULL,               'h'},
		{"version",            0, NULL,                1 },
		{0, 0, NULL, 0}
	};

	/* Short options */
	while ((c = getopt_long(argc, argv, "h",
	                        longopts, NULL)) != -1) {

		switch (c) {

			case 'h' :
			show_help(argv[0]);
			return 0;

			case 1 :
			printf("CrystFEL: " CRYSTFEL_VERSIONSTRING "\n");
			printf(CRYSTFEL_BOILERPLATE"\n");
			return 0;

			default :
			return 1;

		}

	}

	/* This isn't great, but necessary to make the command-line UI and file
	 * formats consistent with the other programs, which all use the C
	 * locale.  Better would be to have all the programs call
	 * setlocale(LC_ALL, "") and use the C locale temporarily when reading
	 * or writing a stream, reflection file, geometry file etc. */
	gtk_disable_setlocale();

	gtk_init(&argc, &argv);

	proj.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	gtk_window_set_title(GTK_WINDOW(proj.window), "CrystFEL");
	g_signal_connect(G_OBJECT(proj.window), "destroy", G_CALLBACK(destroy_sig),
	                 &proj);

	vbox = gtk_vbox_new(FALSE, 0.0);
	gtk_container_add(GTK_CONTAINER(proj.window), vbox);
	add_menu_bar(&proj, vbox);

	vpaned = gtk_paned_new(GTK_ORIENTATION_VERTICAL);
	gtk_box_pack_end(GTK_BOX(vbox), vpaned, TRUE, TRUE, 0.0);

	hpaned = gtk_paned_new(GTK_ORIENTATION_HORIZONTAL);
	gtk_paned_pack1(GTK_PANED(vpaned), hpaned, TRUE, TRUE);

	proj.imageview = crystfel_image_view_new();

	/* CrystFELImage into main area */
	frame = gtk_frame_new(NULL);
	gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
	scroll = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scroll),
	                               GTK_POLICY_ALWAYS, GTK_POLICY_ALWAYS);
	gtk_container_add(GTK_CONTAINER(scroll), GTK_WIDGET(proj.imageview));
	gtk_container_add(GTK_CONTAINER(frame), GTK_WIDGET(scroll));
	gtk_paned_pack2(GTK_PANED(hpaned), GTK_WIDGET(frame), TRUE, TRUE);

	/* Icon region at left */
	proj.icons = gtk_drawing_area_new();
	frame = gtk_frame_new(NULL);
	gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
	gtk_container_add(GTK_CONTAINER(frame), GTK_WIDGET(proj.icons));
	gtk_paned_pack1(GTK_PANED(hpaned), GTK_WIDGET(frame), FALSE, FALSE);

	/* Report (text) region at bottom */
	proj.report = gtk_text_view_new();
	frame = gtk_frame_new(NULL);
	gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
	gtk_container_add(GTK_CONTAINER(frame), GTK_WIDGET(proj.report));
	gtk_paned_pack2(GTK_PANED(vpaned), GTK_WIDGET(frame), FALSE, FALSE);

	gtk_window_set_default_size(GTK_WINDOW(proj.window), 1024, 768);
	gtk_paned_set_position(GTK_PANED(hpaned), 172);
	gtk_paned_set_position(GTK_PANED(vpaned), 600);
	gtk_widget_show_all(proj.window);
	gtk_main();

	return 0;
}