/*
 * This file is part of GNOME LaTeX.
 *
 * Copyright (C) 2015 - Sébastien Wilmet <swilmet@gnome.org>
 *
 * GNOME LaTeX 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.
 *
 * GNOME LaTeX 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 GNOME LaTeX.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * SECTION:templates-manage-dialog
 * @title: LatexilaTemplatesManageDialog
 * @short_description: Dialog to manage personal templates
 * @see_also: #LatexilaTemplatesPersonal
 *
 * #LatexilaTemplatesManageDialog is a #GtkDialog to manage personal templates.
 * The implemented actions: delete, move up and move down.
 */

#include "latexila-templates-manage-dialog.h"
#include <glib/gi18n.h>
#include "latexila-templates-personal.h"
#include "latexila-templates-common.h"
#include "latexila-utils.h"

struct _LatexilaTemplatesManageDialog
{
	GtkDialog parent;

	GtkTreeView *templates_view;

	GtkToolButton *delete_button;
	GtkToolButton *move_up_button;
	GtkToolButton *move_down_button;
};

typedef enum
{
	MOVE_UP,
	MOVE_DOWN
} MoveType;

G_DEFINE_TYPE (LatexilaTemplatesManageDialog, latexila_templates_manage_dialog, GTK_TYPE_DIALOG)

static void
update_move_buttons_sensitivity (LatexilaTemplatesManageDialog *manage_dialog)
{
	GtkTreeSelection *selection;
	gint n_selected_rows;
	GList *selected_rows;
	GtkTreeModel *model;
	GtkTreePath *path;
	gint *indices;
	gint depth;
	gint items_count;
	gboolean first_item_selected;
	gboolean last_item_selected;

	selection = gtk_tree_view_get_selection (manage_dialog->templates_view);
	n_selected_rows = gtk_tree_selection_count_selected_rows (selection);

	if (n_selected_rows != 1)
	{
		gtk_widget_set_sensitive (GTK_WIDGET (manage_dialog->move_up_button), FALSE);
		gtk_widget_set_sensitive (GTK_WIDGET (manage_dialog->move_down_button), FALSE);
		return;
	}

	selected_rows = gtk_tree_selection_get_selected_rows (selection, &model);
	g_assert (g_list_length (selected_rows) == 1);

	path = selected_rows->data;
	indices = gtk_tree_path_get_indices_with_depth (path, &depth);
	g_assert (depth == 1);

	items_count = gtk_tree_model_iter_n_children (model, NULL);

	first_item_selected = indices[0] == 0;
	last_item_selected = indices[0] == (items_count - 1);

	gtk_widget_set_sensitive (GTK_WIDGET (manage_dialog->move_up_button), !first_item_selected);
	gtk_widget_set_sensitive (GTK_WIDGET (manage_dialog->move_down_button), !last_item_selected);

	g_list_free_full (selected_rows, (GDestroyNotify) gtk_tree_path_free);
}

static void
update_buttons_sensitivity (LatexilaTemplatesManageDialog *manage_dialog)
{
	GtkTreeSelection *selection;
	gint n_selected_rows;

	selection = gtk_tree_view_get_selection (manage_dialog->templates_view);
	n_selected_rows = gtk_tree_selection_count_selected_rows (selection);

	gtk_widget_set_sensitive (GTK_WIDGET (manage_dialog->delete_button),
				  n_selected_rows > 0);

	update_move_buttons_sensitivity (manage_dialog);
}

static void
delete_button_clicked_cb (GtkToolButton                 *delete_button,
			  LatexilaTemplatesManageDialog *manage_dialog)
{
	GtkTreeSelection *selection;
	GtkTreeModel *model;
	LatexilaTemplatesPersonal *templates_store;
	GtkTreeIter iter;
	gchar *name;
	GtkDialog *confirm_dialog;
	gint response;

	selection = gtk_tree_view_get_selection (manage_dialog->templates_view);

	if (!gtk_tree_selection_get_selected (selection, &model, &iter))
	{
		g_return_if_reached ();
	}

	templates_store = latexila_templates_personal_get_instance ();
	g_return_if_fail (GTK_TREE_MODEL (templates_store) == model);

	gtk_tree_model_get (model, &iter,
			    LATEXILA_TEMPLATES_COLUMN_NAME, &name,
			    -1);

	confirm_dialog = GTK_DIALOG (gtk_message_dialog_new (GTK_WINDOW (manage_dialog),
							     GTK_DIALOG_MODAL |
							     GTK_DIALOG_DESTROY_WITH_PARENT,
							     GTK_MESSAGE_QUESTION,
							     GTK_BUTTONS_NONE,
							     _ ("Do you really want to delete the template “%s”?"),
							     name));

	gtk_dialog_add_buttons (confirm_dialog,
				_ ("_Cancel"), GTK_RESPONSE_CANCEL,
				_ ("_Delete"), GTK_RESPONSE_YES,
				NULL);

	response = gtk_dialog_run (confirm_dialog);
	gtk_widget_destroy (GTK_WIDGET (confirm_dialog));

	if (response == GTK_RESPONSE_YES)
	{
		GError *error = NULL;

		latexila_templates_personal_delete (templates_store, &iter, &error);

		if (error != NULL)
		{
			GtkWidget *error_dialog;

			error_dialog = gtk_message_dialog_new (GTK_WINDOW (manage_dialog),
							       GTK_DIALOG_MODAL |
							       GTK_DIALOG_DESTROY_WITH_PARENT |
							       GTK_DIALOG_USE_HEADER_BAR,
							       GTK_MESSAGE_ERROR,
							       GTK_BUTTONS_OK,
							       _ ("Error when deleting the template “%s”."),
							       name);

			gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (error_dialog),
								  "%s", error->message);

			gtk_dialog_run (GTK_DIALOG (error_dialog));
			gtk_widget_destroy (error_dialog);

			g_error_free (error);
		}
	}

	g_free (name);
}

static void
move_template (LatexilaTemplatesManageDialog *manage_dialog,
	       MoveType                       move_type)
{
	GtkTreeSelection *selection;
	GtkTreeModel *model;
	LatexilaTemplatesPersonal *templates_store;
	GtkTreeIter iter;
	GError *error = NULL;

	selection = gtk_tree_view_get_selection (manage_dialog->templates_view);

	if (!gtk_tree_selection_get_selected (selection, &model, &iter))
	{
		g_return_if_reached ();
	}

	templates_store = latexila_templates_personal_get_instance ();
	g_return_if_fail (GTK_TREE_MODEL (templates_store) == model);

	switch (move_type)
	{
		case MOVE_UP:
			latexila_templates_personal_move_up (templates_store, &iter, &error);
			break;

		case MOVE_DOWN:
			latexila_templates_personal_move_down (templates_store, &iter, &error);
			break;

		default:
			g_assert_not_reached ();
	}

	if (error != NULL)
	{
		GtkWidget *error_dialog;

		error_dialog = gtk_message_dialog_new (GTK_WINDOW (manage_dialog),
						       GTK_DIALOG_MODAL |
						       GTK_DIALOG_DESTROY_WITH_PARENT |
						       GTK_DIALOG_USE_HEADER_BAR,
						       GTK_MESSAGE_ERROR,
						       GTK_BUTTONS_OK,
						       "%s", _ ("Error when moving the template."));

		gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (error_dialog),
							  "%s", error->message);

		gtk_dialog_run (GTK_DIALOG (error_dialog));
		gtk_widget_destroy (error_dialog);

		g_error_free (error);
	}

	update_buttons_sensitivity (manage_dialog);
}

static void
move_up_button_clicked_cb (GtkToolButton                 *move_up_button,
			   LatexilaTemplatesManageDialog *manage_dialog)
{
	move_template (manage_dialog, MOVE_UP);
}

static void
move_down_button_clicked_cb (GtkToolButton                 *move_down_button,
			     LatexilaTemplatesManageDialog *manage_dialog)
{
	move_template (manage_dialog, MOVE_DOWN);
}

static GtkToolbar *
init_toolbar (LatexilaTemplatesManageDialog *manage_dialog)
{
	GtkToolbar *toolbar;
	GtkStyleContext *context;

	toolbar = GTK_TOOLBAR (gtk_toolbar_new ());
	gtk_toolbar_set_icon_size (toolbar, GTK_ICON_SIZE_SMALL_TOOLBAR);
	gtk_toolbar_set_style (toolbar, GTK_TOOLBAR_ICONS);

	context = gtk_widget_get_style_context (GTK_WIDGET (toolbar));
	gtk_style_context_add_class (context, GTK_STYLE_CLASS_INLINE_TOOLBAR);

	/* Delete */
	manage_dialog->delete_button = GTK_TOOL_BUTTON (gtk_tool_button_new (NULL, NULL));
	gtk_tool_button_set_icon_name (manage_dialog->delete_button, "list-remove-symbolic");
	gtk_widget_set_tooltip_text (GTK_WIDGET (manage_dialog->delete_button), _ ("Delete"));

	gtk_toolbar_insert (toolbar, GTK_TOOL_ITEM (manage_dialog->delete_button), -1);

	g_signal_connect (manage_dialog->delete_button,
			  "clicked",
			  G_CALLBACK (delete_button_clicked_cb),
			  manage_dialog);

	/* Move up */
	manage_dialog->move_up_button = GTK_TOOL_BUTTON (gtk_tool_button_new (NULL, NULL));
	gtk_tool_button_set_icon_name (manage_dialog->move_up_button, "go-up-symbolic");
	gtk_widget_set_tooltip_text (GTK_WIDGET (manage_dialog->move_up_button), _ ("Move up"));

	gtk_toolbar_insert (toolbar, GTK_TOOL_ITEM (manage_dialog->move_up_button), -1);

	g_signal_connect (manage_dialog->move_up_button,
			  "clicked",
			  G_CALLBACK (move_up_button_clicked_cb),
			  manage_dialog);

	/* Move down */
	manage_dialog->move_down_button = GTK_TOOL_BUTTON (gtk_tool_button_new (NULL, NULL));
	gtk_tool_button_set_icon_name (manage_dialog->move_down_button, "go-down-symbolic");
	gtk_widget_set_tooltip_text (GTK_WIDGET (manage_dialog->move_down_button), _ ("Move down"));

	gtk_toolbar_insert (toolbar, GTK_TOOL_ITEM (manage_dialog->move_down_button), -1);

	g_signal_connect (manage_dialog->move_down_button,
			  "clicked",
			  G_CALLBACK (move_down_button_clicked_cb),
			  manage_dialog);

	return toolbar;
}

static void
latexila_templates_manage_dialog_class_init (LatexilaTemplatesManageDialogClass *klass)
{
}

static void
latexila_templates_manage_dialog_init (LatexilaTemplatesManageDialog *manage_dialog)
{
	LatexilaTemplatesPersonal *templates_store;
	GtkWidget *scrolled_window;
	GtkToolbar *toolbar;
	GtkWidget *dialog_content;
	GtkBox *content_area;
	GtkTreeSelection *selection;

	templates_store = latexila_templates_personal_get_instance ();
	manage_dialog->templates_view = latexila_templates_get_view (GTK_LIST_STORE (templates_store));

	scrolled_window = gtk_scrolled_window_new (NULL, NULL);
	gtk_widget_set_size_request (scrolled_window, 350, 300);
	gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_window),
					     GTK_SHADOW_IN);

	gtk_container_add (GTK_CONTAINER (scrolled_window),
			   GTK_WIDGET (manage_dialog->templates_view));

	toolbar = init_toolbar (manage_dialog);

	dialog_content = latexila_utils_join_widgets (scrolled_window, GTK_WIDGET (toolbar));

	content_area = GTK_BOX (gtk_dialog_get_content_area (GTK_DIALOG (manage_dialog)));
	gtk_box_pack_start (content_area, dialog_content, TRUE, TRUE, 0);
	gtk_widget_show_all (GTK_WIDGET (content_area));

	selection = gtk_tree_view_get_selection (manage_dialog->templates_view);

	g_signal_connect_swapped (selection,
				  "changed",
				  G_CALLBACK (update_buttons_sensitivity),
				  manage_dialog);

	update_buttons_sensitivity (manage_dialog);
}

/**
 * latexila_templates_manage_dialog_new:
 * @parent_window: transient parent window of the dialog.
 *
 * Returns: a #GtkDialog to manage personal templates.
 */
GtkDialog *
latexila_templates_manage_dialog_new (GtkWindow *parent_window)
{
	g_return_val_if_fail (GTK_IS_WINDOW (parent_window), NULL);

	return g_object_new (LATEXILA_TYPE_TEMPLATES_MANAGE_DIALOG,
			     "title", _ ("Manage Personal Templates"),
			     "transient-for", parent_window,
			     "modal", TRUE,
			     "destroy-with-parent", TRUE,
			     "use-header-bar", TRUE,
			     "border-width", 6,
			     NULL);
}
