/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * e-table-click-to-add.c
 * Copyright 2000, 2001, Ximian, Inc.
 *
 * Authors:
 *   Chris Lahey <clahey@ximian.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License, version 2, as published by the Free Software Foundation.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>
#include <gdk/gdkkeysyms.h>
#include <gtk/gtksignal.h>
#include <libgnomecanvas/gnome-canvas.h>
#include <libgnomecanvas/gnome-canvas-util.h>
#include <libgnomecanvas/gnome-canvas-rect-ellipse.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

#include "e-table-header.h"
#include "e-table-click-to-add.h"
#include "e-table-defines.h"
#include "e-table-one.h"
#include "gal/e-text/e-text.h"
#include "gal/widgets/e-canvas.h"
#include "gal/widgets/e-canvas-utils.h"
#include "gal/util/e-util.h"

enum {
	CURSOR_CHANGE,
	LAST_SIGNAL
};

static guint etcta_signals [LAST_SIGNAL] = { 0 };

#define PARENT_OBJECT_TYPE gnome_canvas_group_get_type ()

#define ELEMENTS(x) (sizeof (x) / sizeof (x[0]))

static GnomeCanvasGroupClass *etcta_parent_class;

enum {
	ARG_0,
	ARG_HEADER,
	ARG_MODEL,
	ARG_MESSAGE,
	ARG_WIDTH,
	ARG_HEIGHT
};

static void
etcta_cursor_change (GtkObject *object, gint row, gint col, ETableClickToAdd *etcta)
{
	gtk_signal_emit (GTK_OBJECT (etcta),
			 etcta_signals [CURSOR_CHANGE],
			 row, col);
}

static void
etcta_add_table_header (ETableClickToAdd *etcta, ETableHeader *header)
{
	etcta->eth = header;
	if (etcta->eth)
		gtk_object_ref (GTK_OBJECT (etcta->eth));
	if (etcta->row)
		gnome_canvas_item_set(GNOME_CANVAS_ITEM(etcta->row),
				      "ETableHeader", header,
				      NULL);
}

static void
etcta_drop_table_header (ETableClickToAdd *etcta)
{
	GtkObject *header;
	
	if (!etcta->eth)
		return;

	header = GTK_OBJECT (etcta->eth);

	gtk_object_unref (header);
	etcta->eth = NULL;
}

static void
etcta_add_one (ETableClickToAdd *etcta, ETableModel *one)
{
	etcta->one = one;
	if (etcta->one)
		gtk_object_ref (GTK_OBJECT(etcta->one));
	if (etcta->row)
		gnome_canvas_item_set(GNOME_CANVAS_ITEM(etcta->row),
				      "ETableModel", one,
				      NULL);
	gtk_object_set(GTK_OBJECT(etcta->selection),
		       "model", one,
		       NULL);
}

static void
etcta_drop_one (ETableClickToAdd *etcta)
{
	if (!etcta->one)
		return;
	gtk_object_unref (GTK_OBJECT(etcta->one));
	etcta->one = NULL;
	gtk_object_set(GTK_OBJECT(etcta->selection),
		       "model", NULL,
		       NULL);
}

static void
etcta_add_model (ETableClickToAdd *etcta, ETableModel *model)
{
	etcta->model = model;
	if (etcta->model)
		gtk_object_ref (GTK_OBJECT(etcta->model));
}

static void
etcta_drop_model (ETableClickToAdd *etcta)
{
	etcta_drop_one (etcta);
	if (!etcta->model)
		return;
	gtk_object_unref (GTK_OBJECT(etcta->model));
	etcta->model = NULL;
}

static void
etcta_add_message (ETableClickToAdd *etcta, char *message)
{
	etcta->message = g_strdup(message);
}

static void
etcta_drop_message (ETableClickToAdd *etcta)
{
	g_free(etcta->message);
	etcta->message = NULL;
}


static void
etcta_destroy (GtkObject *object)
{
	ETableClickToAdd *etcta = E_TABLE_CLICK_TO_ADD (object);

	etcta_drop_table_header (etcta);
	etcta_drop_model (etcta);
	etcta_drop_message (etcta);
	if (etcta->selection)
		gtk_object_unref (GTK_OBJECT(etcta->selection));
	etcta->selection = NULL;

	if (GTK_OBJECT_CLASS (etcta_parent_class)->destroy)
		(*GTK_OBJECT_CLASS (etcta_parent_class)->destroy) (object);
}

static void
etcta_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
	GnomeCanvasItem *item;
	ETableClickToAdd *etcta;

	item = GNOME_CANVAS_ITEM (o);
	etcta = E_TABLE_CLICK_TO_ADD (o);

	switch (arg_id){
	case ARG_HEADER:
		etcta_drop_table_header (etcta);
		etcta_add_table_header (etcta, E_TABLE_HEADER(GTK_VALUE_OBJECT (*arg)));
		break;
	case ARG_MODEL:
		etcta_drop_model (etcta);
		etcta_add_model (etcta, E_TABLE_MODEL(GTK_VALUE_OBJECT (*arg)));
		break;
	case ARG_MESSAGE:
		etcta_drop_message (etcta);
		etcta_add_message (etcta, GTK_VALUE_STRING (*arg));
		break;
	case ARG_WIDTH:
		etcta->width = GTK_VALUE_DOUBLE (*arg);
		if (etcta->row)
			gnome_canvas_item_set(etcta->row,
					      "minimum_width", etcta->width,
					      NULL);
		if (etcta->text)
			gnome_canvas_item_set(etcta->text,
					      "width", etcta->width - 4,
					      NULL);
		if (etcta->rect)
			gnome_canvas_item_set(etcta->rect,
					      "x2", etcta->width - 1,
					      NULL);
		break;
	}
	gnome_canvas_item_request_update(item);
}

static void
etcta_get_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
	ETableClickToAdd *etcta;

	etcta = E_TABLE_CLICK_TO_ADD (o);

	switch (arg_id){
	case ARG_HEADER:
		GTK_VALUE_OBJECT (*arg) = GTK_OBJECT(etcta->eth);
		break;
	case ARG_MODEL:
		GTK_VALUE_OBJECT (*arg) = GTK_OBJECT(etcta->model);
		break;
	case ARG_MESSAGE:
		GTK_VALUE_STRING (*arg) = g_strdup(etcta->message);
		break;
	case ARG_WIDTH:
		GTK_VALUE_DOUBLE (*arg) = etcta->width;
		break;
	case ARG_HEIGHT:
		GTK_VALUE_DOUBLE (*arg) = etcta->height;
		break;
	default:
		arg->type = GTK_TYPE_INVALID;
		break;
	}
}

static void
etcta_realize (GnomeCanvasItem *item)
{
	ETableClickToAdd *etcta = E_TABLE_CLICK_TO_ADD (item);

	etcta->rect = gnome_canvas_item_new(GNOME_CANVAS_GROUP(item),
					    gnome_canvas_rect_get_type(),
					    "x1", (double) 0,
					    "y1", (double) 0,
					    "x2", (double) etcta->width - 1,
					    "y2", (double) etcta->height - 1,
					    "outline_color", "black", 
					    "fill_color", "white",
					    NULL);

	etcta->text = gnome_canvas_item_new(GNOME_CANVAS_GROUP(item),
					    e_text_get_type(),
					    "text", etcta->message ? etcta->message : "",
					    "anchor", GTK_ANCHOR_NW,
					    "width", etcta->width - 4,
					    "draw_background", FALSE,
					    NULL);
	e_canvas_item_move_absolute (etcta->text, 2, 2);

	if (GNOME_CANVAS_ITEM_CLASS (etcta_parent_class)->realize)
		(*GNOME_CANVAS_ITEM_CLASS (etcta_parent_class)->realize)(item);
}

static void
etcta_unrealize (GnomeCanvasItem *item)
{
	if (GNOME_CANVAS_ITEM_CLASS (etcta_parent_class)->unrealize)
		(*GNOME_CANVAS_ITEM_CLASS (etcta_parent_class)->unrealize)(item);
}

static void finish_editing (ETableClickToAdd *etcta);

static int
item_key_press (ETableItem *item, int row, int col, GdkEvent *event, ETableClickToAdd *etcta)
{
	switch (event->key.keyval) {
		case GDK_Return:
		case GDK_KP_Enter:
		case GDK_ISO_Enter:
		case GDK_3270_Enter:
			finish_editing(etcta);
			return TRUE;
	}
	return FALSE;
}

static void
set_initial_selection (ETableClickToAdd *etcta)
{
	e_selection_model_do_something (E_SELECTION_MODEL(etcta->selection), 
					0, e_table_header_prioritized_column (etcta->eth), 
					0);
}

static void
finish_editing (ETableClickToAdd *etcta)
{
	if (etcta->row) {
		ETableModel *one;

		e_table_item_leave_edit (E_TABLE_ITEM (etcta->row));
		e_table_one_commit(E_TABLE_ONE(etcta->one));
		etcta_drop_one (etcta);
		gtk_object_destroy(GTK_OBJECT(etcta->row));
		etcta->row = NULL;

		one = e_table_one_new(etcta->model);
		etcta_add_one (etcta, one);
		gtk_object_unref(GTK_OBJECT(one));

		e_selection_model_clear(E_SELECTION_MODEL(etcta->selection));

		etcta->row = gnome_canvas_item_new(GNOME_CANVAS_GROUP(etcta),
						   e_table_item_get_type(),
						   "ETableHeader", etcta->eth,
						   "ETableModel", etcta->one,
						   "minimum_width", etcta->width,
						   "horizontal_draw_grid", TRUE,
						   "vertical_draw_grid", TRUE,
						   "selection_model", etcta->selection,
						   "cursor_mode", E_CURSOR_SPREADSHEET,
						   NULL);

		gtk_signal_connect(GTK_OBJECT(etcta->row), "key_press",
				   GTK_SIGNAL_FUNC(item_key_press), etcta);

		set_initial_selection (etcta);
	}
}

/*
 * Handles the events on the ETableClickToAdd, particularly it creates the ETableItem and passes in some events.
 */
static int
etcta_event (GnomeCanvasItem *item, GdkEvent *e)
{
	ETableClickToAdd *etcta = E_TABLE_CLICK_TO_ADD (item);

	switch (e->type){
	case GDK_BUTTON_PRESS:
		if (etcta->text) {
			gtk_object_destroy(GTK_OBJECT(etcta->text));
			etcta->text = NULL;
		}
		if (etcta->rect) {
			gtk_object_destroy(GTK_OBJECT(etcta->rect));
			etcta->rect = NULL;
		}
		if (!etcta->row) {
			ETableModel *one;

			one = e_table_one_new(etcta->model);
			etcta_add_one (etcta, one);
			gtk_object_unref(GTK_OBJECT(one));
			
			e_selection_model_clear(E_SELECTION_MODEL(etcta->selection));

			etcta->row = gnome_canvas_item_new(GNOME_CANVAS_GROUP(item),
							   e_table_item_get_type(),
							   "ETableHeader", etcta->eth,
							   "ETableModel", etcta->one,
							   "minimum_width", etcta->width,
							   "horizontal_draw_grid", TRUE,
							   "vertical_draw_grid", TRUE,
							   "selection_model", etcta->selection,
							   "cursor_mode", E_CURSOR_SPREADSHEET,
							   NULL);

			gtk_signal_connect(GTK_OBJECT(etcta->row), "key_press",
					   GTK_SIGNAL_FUNC(item_key_press), etcta);

			e_canvas_item_grab_focus (GNOME_CANVAS_ITEM(etcta->row), TRUE);

			set_initial_selection (etcta);
		}
		break;

	case GDK_KEY_PRESS:
		switch (e->key.keyval) {
		case GDK_Tab:
		case GDK_KP_Tab:
		case GDK_ISO_Left_Tab:
			finish_editing (etcta);
			break;
		default:
			return FALSE;
			break;
		}
		break;
			
	default:
		return FALSE;
	}
	return TRUE;
}

static void
etcta_reflow (GnomeCanvasItem *item, int flags)
{
	ETableClickToAdd *etcta = E_TABLE_CLICK_TO_ADD (item);
	
	double old_height = etcta->height;
	
	if (etcta->text) {
		gtk_object_get(GTK_OBJECT(etcta->text),
			       "height", &etcta->height,
			       NULL);
		etcta->height += 6;
	}
	if (etcta->row) {
		gtk_object_get(GTK_OBJECT(etcta->row),
			       "height", &etcta->height,
			       NULL);
	}

	if (etcta->rect) {
		gtk_object_set(GTK_OBJECT(etcta->rect),
			       "y2", etcta->height - 1,
			       NULL);
	}
	if (old_height != etcta->height)
		e_canvas_item_request_parent_reflow(item);
}

static void
etcta_class_init (ETableClickToAddClass *klass)
{
	GnomeCanvasItemClass *item_class = GNOME_CANVAS_ITEM_CLASS(klass);
	GtkObjectClass *object_class = GTK_OBJECT_CLASS(klass);

	etcta_parent_class = gtk_type_class (PARENT_OBJECT_TYPE);

	klass->cursor_change = NULL;

	object_class->destroy = etcta_destroy;
	object_class->set_arg = etcta_set_arg;
	object_class->get_arg = etcta_get_arg;

	item_class->realize     = etcta_realize;
	item_class->unrealize   = etcta_unrealize;
	item_class->event       = etcta_event;

	gtk_object_add_arg_type ("ETableClickToAdd::header", GTK_TYPE_OBJECT,
				 GTK_ARG_READWRITE, ARG_HEADER);
	gtk_object_add_arg_type ("ETableClickToAdd::model", GTK_TYPE_OBJECT,
				 GTK_ARG_READWRITE, ARG_MODEL);
	gtk_object_add_arg_type ("ETableClickToAdd::message", GTK_TYPE_STRING,
				 GTK_ARG_READWRITE, ARG_MESSAGE);
	gtk_object_add_arg_type ("ETableClickToAdd::width", GTK_TYPE_DOUBLE,
				 GTK_ARG_READWRITE, ARG_WIDTH);
	gtk_object_add_arg_type ("ETableClickToAdd::height", GTK_TYPE_DOUBLE,
				 GTK_ARG_READABLE, ARG_HEIGHT);

	etcta_signals [CURSOR_CHANGE] =
		gtk_signal_new ("cursor_change",
				GTK_RUN_LAST,
				E_OBJECT_CLASS_TYPE (object_class),
				GTK_SIGNAL_OFFSET (ETableClickToAddClass, cursor_change),
				gtk_marshal_NONE__INT_INT,
				GTK_TYPE_NONE, 2, GTK_TYPE_INT, GTK_TYPE_INT);

	E_OBJECT_CLASS_ADD_SIGNALS (object_class, etcta_signals, LAST_SIGNAL);
}

static void
etcta_init (GnomeCanvasItem *item)
{
	ETableClickToAdd *etcta = E_TABLE_CLICK_TO_ADD (item);

	etcta->one = NULL;
	etcta->model = NULL;
	etcta->eth = NULL;

	etcta->message = NULL;

	etcta->row = NULL;
	etcta->text = NULL;
	etcta->rect = NULL;

	etcta->selection = e_table_selection_model_new();
	gtk_signal_connect(GTK_OBJECT(etcta->selection), "cursor_changed",
			   GTK_SIGNAL_FUNC(etcta_cursor_change), etcta);

	e_canvas_item_set_reflow_callback(item, etcta_reflow);
}

GtkType
e_table_click_to_add_get_type (void)
{
	static GtkType type = 0;

	if (!type){
		GtkTypeInfo info = {
			"ETableClickToAdd",
			sizeof (ETableClickToAdd),
			sizeof (ETableClickToAddClass),
			(GtkClassInitFunc) etcta_class_init,
			(GtkObjectInitFunc) etcta_init,
			NULL, /* reserved 1 */
			NULL, /* reserved 2 */
			(GtkClassInitFunc) NULL
		};

		type = gtk_type_unique (PARENT_OBJECT_TYPE, &info);
	}

	return type;
}


/* The colors in this need to be themefied. */
/**
 * e_table_click_to_add_commit:
 * @etcta: The %ETableClickToAdd to commit.
 * 
 * This routine commits the current thing being edited and returns to
 * just displaying the click to add message.
 **/
void
e_table_click_to_add_commit (ETableClickToAdd *etcta)
{
	if (etcta->row) {
		e_table_one_commit(E_TABLE_ONE(etcta->one));
		etcta_drop_one (etcta);
		gtk_object_destroy(GTK_OBJECT(etcta->row));
		etcta->row = NULL;
	}
	if (!etcta->rect) {
		etcta->rect = gnome_canvas_item_new(GNOME_CANVAS_GROUP(etcta),
						    gnome_canvas_rect_get_type(),
						    "x1", (double) 0,
						    "y1", (double) 0,
						    "x2", (double) etcta->width - 1,
						    "y2", (double) etcta->height - 1,
						    "outline_color", "black",
						    "fill_color", "white",
						    NULL);
	}
	if (!etcta->text) {
		etcta->text = gnome_canvas_item_new(GNOME_CANVAS_GROUP(etcta),
						    e_text_get_type(),
						    "text", etcta->message ? etcta->message : "",
						    "anchor", GTK_ANCHOR_NW,
						    "width", etcta->width - 4,
						    "draw_background", FALSE,
						    NULL);
		e_canvas_item_move_absolute (etcta->text, 3, 3);
	}
}
