/*
 * E-table-item.c: A view of a Table.
 *
 * Author:
 *   Miguel de Icaza (miguel@gnu.org)
 *
 * Copyright 1999, Helix Code, Inc.
 */
#include <config.h>
#include "e-table-item.h"
#include "e-cell.h"

#define PARENT_OBJECT_TYPE gnome_canvas_item_get_type ()

static GnomeCanvasItemClass *eti_parent_class;

enum {
	ARG_0,
	ARG_TABLE_HEADER,
	ARG_TABLE_MODEL,
	ARG_TABLE_X,
	ARG_TABLE_Y,
	ARG_TABLE_DRAW_GRID,
	ARG_LENGHT_THRESHOLD
};

static void
eti_realize_cell_views (ETableItem *eti)
{
	GnomeCanvasItem *item = GNOME_CANVAS_ITEM (eti);
	int i;
	
	/*
	 * Now realize the various ECells
	 */
	eti->n_cells = eti->cols;
	eti->cell_views = g_new (ECellView *, eti->n_cells);

	for (i = 0; i < eti->n_cells; i++){
		ETableCol *col = e_table_header_get_column (eti->header, i);
		
		eti->cell_views [i] = e_cell_realize (col->ecell, item->canvas);
	}
}

static void
eti_unrealize_cell_views (ETableItem *eti)
{
	int i;

	for (i = 0; i < eti->n_cells; i++){
		ETableCol *col = e_table_header_get_column (eti->header, i);
		
		e_cell_unrealize (eti->cell_views [i]);
		eti->cell_views [i] = NULL;
	}
	g_free (eti->cell_views);
	eti->n_cells = 0;

}

static void
eti_update (GnomeCanvasItem *item, double *affine, ArtSVP *clip_path, int flags)
{
	ETableItem *eti = E_TABLE_ITEM (item);
	
	if (GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->update)
		(*GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->update)(item, affine, clip_path, flags);

	item->x1 = eti->x1;
	item->y1 = eti->y1;
	item->x2 = eti->x1 + eti->width;
	item->y2 = eti->y1 + eti->height;

	gnome_canvas_group_child_bounds (GNOME_CANVAS_GROUP (item->parent), item);
}

static void
eti_remove_table_model (ETableItem *eti)
{
	if (!eti->table_model)
		return;

	gtk_signal_disconnect (eti->table_model_change_id);
	gtk_signal_disconnect (eti->table_model_selection_id);
	gtk_object_unref (GTK_OBJECT (eti->table_model));

	eti->table_model_change_id = 0;
	eti->table_model_selection_id = 0;
	eti->table_model = NULL;
}

static void
eti_remove_header_model (ETableItem *eti)
{
	if (!eti->header)
		return;

	gtk_signal_disconnect (eti->header_structure_change_id);
	gtk_signal_disconnect (eti->header_dim_change_id);
	gtk_object_unref (GTK_OBJECT (eti->header));

	eti->header_structure_change_id = 0;
	eti->header_dim_change_id = 0;
	eti->header = NULL;
}

static int
eti_row_height (ETableItem *eti, int row)
{
	const int cols = e_table_header_count (eti->header);
	int col;
	int h, max_h;

	max_h = 0;
	
	for (col = 0; col < cols; col++){
		h = e_cell_height (eti->cell_views [col], col, row);

		if (h > max_h)
			max_h = h;
	}
	return max_h;
}

static int
eti_get_height (ETableItem *eti)
{
	const int rows = eti->rows;
	int row;
	int height = 0;

	if (rows == 0)
		return 0;
	
	if (rows > eti->length_threshold){
		height = eti_row_height (eti, 0) * rows;

		return height;
	}
	
	for (row = 0; row < rows; row++)
		height += eti_row_height (eti, row);

	/* Add division lines pixels */
	height += rows;
	
	return height;
}

static void
eti_table_model_changed (ETableModel *table_model, ETableItem *eti)
{
	eti->cols   = e_table_model_column_count (eti->table_model);
	eti->rows   = e_table_model_row_count (eti->table_model);

	if (eti->cell_views)
		eti->height = eti_get_height (eti);
	
	eti_update (GNOME_CANVAS_ITEM (eti), NULL, NULL, 0);
}

static void
eti_request_redraw (ETableItem *eti)
{
	GnomeCanvas *canvas = GNOME_CANVAS_ITEM (eti)->canvas;

	gnome_canvas_request_redraw (canvas, eti->x1, eti->y1,
				     eti->x1 + eti->width + 1,
				     eti->y1 + eti->height + 1);
}

static int
eti_col_diff (ETableItem *eti, int start_col, int end_col)
{
	int col, total;

	total = 0;
	for (col = start_col; col < end_col; col++){
		ETableCol *ecol = e_table_header_get_column (eti->header, col);

		total += ecol->width;
	}

	return total;
}

static int
eti_row_diff (ETableItem *eti, int start_row, int end_row)
{
	int row, total;

	total = 0;
	
	for (row = start_row; row < end_row; row++)
		total += eti_row_height (eti, row) + 1;

	return total;
}

static void
eti_request_region_redraw (ETableItem *eti, int start_col, int start_row, int end_col, int end_row)
{
	GnomeCanvas *canvas = GNOME_CANVAS_ITEM (eti)->canvas;
	int x1, y1, width, height;
	int col, row;
	
	x1 = eti_col_diff (eti, 0, start_col);
	y1 = eti_row_diff (eti, 0, start_row);
	width = eti_col_diff (eti, start_col, end_col);
	height = eti_row_diff (eti, start_col, end_row);
	
	gnome_canvas_request_redraw (canvas,
				     eti->x1 + x1, eti->y1 + y1,
				     eti->y1 + width + 1,
				     eti->x1 + height + 1);
}

static void
eti_table_model_row_selection (ETableModel *table_model, int row, gboolean selected, ETableItem *eti)
{
	eti_request_region_redraw (eti, 0, row, eti->cols, row);
}

static void
eti_add_table_model (ETableItem *eti, ETableModel *table_model)
{
	g_assert (eti->table_model == NULL);
	
	eti->table_model = table_model;
	gtk_object_ref (GTK_OBJECT (table_model));
	
	eti->table_model_change_id = gtk_signal_connect (
		GTK_OBJECT (table_model), "model_changed",
		GTK_SIGNAL_FUNC (eti_table_model_changed), eti);
	eti->table_model_selection_id = gtk_signal_connect (
		GTK_OBJECT (table_model), "row_selection",
		GTK_SIGNAL_FUNC (eti_table_model_row_selection), eti);
	eti_table_model_changed (table_model, eti);
}

static void
eti_header_dim_changed (ETableHeader *eth, int col, ETableItem *eti)
{
	eti_request_redraw (eti);

	eti->width = e_table_header_total_width (eti->header);
	eti_update (GNOME_CANVAS_ITEM (eti), NULL, NULL, 0);

	eti_request_redraw (eti);
}

static void
eti_header_structure_changed (ETableHeader *eth, ETableItem *eti)
{
	eti_request_redraw (eti);

	eti->width = e_table_header_total_width (eti->header);
	eti_unrealize_cell_views (eti);
	eti_realize_cell_views (eti);
	eti_update (GNOME_CANVAS_ITEM (eti), NULL, NULL, 0);

	eti_request_redraw (eti);
}

static void
eti_add_header_model (ETableItem *eti, ETableHeader *header)
{
	g_assert (eti->header == NULL);
	
	eti->header = header;
	gtk_object_ref (GTK_OBJECT (header));

	eti->width = e_table_header_total_width (header);
	
	eti->header_dim_change_id = gtk_signal_connect (
		GTK_OBJECT (header), "dimension_change",
		GTK_SIGNAL_FUNC (eti_header_dim_changed), eti);

	eti->header_structure_change_id = gtk_signal_connect (
		GTK_OBJECT (header), "structure_change",
		GTK_SIGNAL_FUNC (eti_header_structure_changed), eti);
}

static void
eti_destroy (GtkObject *object)
{
	ETableItem *eti = E_TABLE_ITEM (object);

	eti_remove_header_model (eti);
	eti_remove_table_model (eti);
	
	if (GTK_OBJECT_CLASS (eti_parent_class)->destroy)
		(*GTK_OBJECT_CLASS (eti_parent_class)->destroy) (object);
}

static void
eti_set_arg (GtkObject *o, GtkArg *arg, guint arg_id)
{
	GnomeCanvasItem *item;
	ETableItem *eti;
	int v;

	item = GNOME_CANVAS_ITEM (o);
	eti = E_TABLE_ITEM (o);

	switch (arg_id){
	case ARG_TABLE_HEADER:
		eti_remove_header_model (eti);
		eti_add_header_model (eti, GTK_VALUE_POINTER (*arg));
		break;

	case ARG_TABLE_MODEL:
		eti_remove_table_model (eti);
		eti_add_table_model (eti, GTK_VALUE_POINTER (*arg));
		break;
		
	case ARG_TABLE_X:
		eti->x1 = GTK_VALUE_INT (*arg);
		break;

	case ARG_TABLE_Y:
		eti->y1 = GTK_VALUE_INT (*arg);
		break;

	case ARG_LENGHT_THRESHOLD:
		eti->length_threshold = GTK_VALUE_INT (*arg);
		break;

	case ARG_TABLE_DRAW_GRID:
		eti->draw_grid = GTK_VALUE_BOOL (*arg);
	}
	eti_update (item, NULL, NULL, 0);
}

static void
eti_init (GnomeCanvasItem *item)
{
	ETableItem *eti = E_TABLE_ITEM (item);

	eti->focused_col = -1;
	eti->focused_row = -1;
	eti->height = 0;
	
	eti->length_threshold = -1;
}

static void
eti_realize (GnomeCanvasItem *item)
{
	ETableItem *eti = E_TABLE_ITEM (item);
	GtkWidget *canvas_widget = GTK_WIDGET (item->canvas);
	GdkWindow *window;
	
	if (GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->realize)
                (*GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->realize)(item);

	window = canvas_widget->window;
	
	eti->fill_gc = canvas_widget->style->white_gc;
	gdk_gc_ref (canvas_widget->style->white_gc);
	eti->grid_gc = gdk_gc_new (window);
	gdk_gc_set_foreground (eti->grid_gc, &canvas_widget->style->bg [GTK_STATE_NORMAL]);

	eti_realize_cell_views (eti);

	eti->height = eti_get_height (eti);
	eti_update (item, NULL, NULL, 0);
}

static void
eti_unrealize (GnomeCanvasItem *item)
{
	ETableItem *eti = E_TABLE_ITEM (item);
	
	gdk_gc_unref (eti->fill_gc);
	eti->fill_gc = NULL;
	gdk_gc_unref (eti->grid_gc);
	eti->grid_gc = NULL;

	eti_unrealize_cell_views (eti);

	eti->height = 0;
	
	if (GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->unrealize)
                (*GNOME_CANVAS_ITEM_CLASS (eti_parent_class)->unrealize)(item);
}

static void
draw_cell (ETableItem *eti, GdkDrawable *drawable, int col, int row,
	   int x1, int y1, int x2, int y2)
{
	GnomeCanvas *canvas = GNOME_CANVAS_ITEM (eti)->canvas;
	ECellView *ecell_view;
	GdkFont *font;
	char  text [40];
		
	font = GTK_WIDGET (canvas)->style->font;

	ecell_view = eti->cell_views [col];

	e_cell_draw (ecell_view, drawable, col, row, x1, y1, x2, y2);

#if 0
	sprintf (text, "%d:%d\n", col, row);	gdk_draw_line (drawable, eti->grid_gc, x1, y1, x2, y2);
	gdk_draw_line (drawable, eti->grid_gc, x1, y2, x2, y1);

	sprintf (text, "%d:%d\n", col, row);
	gdk_draw_text (drawable, font, eti->grid_gc, x1, y2, text, strlen (text));
#endif
}

static void
eti_draw (GnomeCanvasItem *item, GdkDrawable *drawable, int x, int y, int width, int height)
{
	ETableItem *eti = E_TABLE_ITEM (item);
	const int rows = eti->rows;
	const int cols = eti->cols;
	int row, col, y1, y2;
	int first_col, last_col, x_offset;
	int first_row, last_row, y_offset, yd;
	int x1, x2;
	int heights;

	printf ("Rect: %d %d %d %d\n", x, y, width, height);
	/*
	 * Clear the background
	 */
	gdk_draw_rectangle (
		drawable, eti->fill_gc, TRUE,
		eti->x1 - x, eti->y1 - y, eti->width, eti->height);
	
	/*
	 * First column to draw, last column to draw
	 */
	first_col = -1;
	last_col = x_offset = 0;
	x1 = eti->x1;
	for (col = 0; col < cols; col++, x1 = x2){
		ETableCol *ecol = e_table_header_get_column (eti->header, col);

		x2 = x1 + ecol->width;
		
		if (x1 > (x + width))
			break;
		if (x2 < x)
			continue;
		if (first_col == -1){
			x_offset = x1 - x;
			first_col = col;
		}
	}
	last_col = col;

	/*
	 * Nothing to paint
	 */
	if (first_col == -1)
		return;

	/*
	 * Compute row span.
	 */
	first_row = -1;
	y_offset = 0;
	y1 = y2 = eti->y1;
	for (row = eti->top_item; row < rows; row++, y1 = y2){
		int xd;

		y2 += eti_row_height (eti, row);

		if (y1 > y + height)
			break;

		if (y2 < y)
			continue;

		if (first_row == -1){
			y_offset = y1 - y;
			first_row = row;
		}
	}
	last_row = row;

	if (first_row == -1)
		return;

	/*
	 * Draw cells
	 */
	yd = y_offset;
	for (row = first_row; row < last_row; row++){
		int xd, height;
		
		height = eti_row_height (eti, row);

		xd = x_offset;
		printf ("paint: %d %d\n", yd, yd + height);
		for (col = first_col; col < last_col; col++){
			ETableCol *ecol = e_table_header_get_column (eti->header, col);

			draw_cell (eti, drawable, col, row, xd, yd, xd + ecol->width, yd + height);
			
			xd += ecol->width;
		}
		yd += height + 1;
		gdk_draw_line (drawable, eti->grid_gc,
			       eti->x1 - x, yd -1, eti->x1 + eti->width - x, yd -1);
	}
}

static double
eti_point (GnomeCanvasItem *item, double x, double y, int cx, int cy,
	   GnomeCanvasItem **actual_item)
{
	*actual_item = item;

	return 0.0;
}

static gboolean
find_cell (ETableItem *eti, double x, double y, int *col_res, int *row_res)
{
	const int cols = eti->cols;
	const int rows = eti->rows;
	gdouble x1, y1, x2, y2;
	int col, row;
	
	/* FIXME: inneficient, fix later */

	x -= eti->x1;
	y -= eti->y1;
	
	x1 = 0;
	for (col = 0; col < cols; col++, x1 = x2){
		ETableCol *ecol = e_table_header_get_column (eti->header, col);

		if (x < x1)
			return FALSE;
		
		x2 = x1 + ecol->width;

		if (x > x2)
			continue;

		*col_res = col;
		break;
	}

	y1 = 0;
	for (row = 0; row < rows; row++, y1 = y2){
		if (y < y1)
			return FALSE;
		
		y2 += eti_row_height (eti, row) + 1;

		if (y > y2)
			continue;

		*row_res = row;
		break;
	}

	return TRUE;
}

static void
eti_select (ETableItem *eti, int col, int row)
{
	eti->selected_col = col;
	eti->selected_row = row;
}

static int
eti_event (GnomeCanvasItem *item, GdkEvent *e)
{
	ETableItem *eti = E_TABLE_ITEM (item);
	ECellView *ecell_view;
	
	switch (e->type){
	case GDK_BUTTON_PRESS:
	case GDK_BUTTON_RELEASE:
	case GDK_2BUTTON_PRESS: {
		int col, row;

		if (!find_cell (eti, e->button.x, e->button.y, &col, &row))
			return TRUE;

		if (eti->selected_row == row && eti->selected_col == col){
			ecell_view = eti->cell_views [col];

			e_cell_event (ecell_view, e, col, row);
		} else
			eti_select (eti, col, row);
		break;
	}
		
	case GDK_KEY_PRESS:
	case GDK_KEY_RELEASE:
		if (eti->focused_col == -1)
			return FALSE;

		ecell_view = eti->cell_views [eti->focused_col];

		e_cell_event (ecell_view, e, eti->focused_col, eti->focused_row);
		break;

	default:
		return FALSE;
	}
	return TRUE;
}
	
static void
eti_class_init (GtkObjectClass *object_class)
{
	GnomeCanvasItemClass *item_class = (GnomeCanvasItemClass *) object_class;

	eti_parent_class = gtk_type_class (PARENT_OBJECT_TYPE);
	
	object_class->destroy = eti_destroy;
	object_class->set_arg = eti_set_arg;

	item_class->update      = eti_update;
	item_class->realize     = eti_realize;
	item_class->unrealize   = eti_unrealize;
	item_class->draw        = eti_draw;
	item_class->point       = eti_point;
	item_class->event       = eti_event;
	
	gtk_object_add_arg_type ("ETableItem::ETableHeader", GTK_TYPE_POINTER,
				 GTK_ARG_WRITABLE, ARG_TABLE_HEADER);
	gtk_object_add_arg_type ("ETableItem::ETableModel", GTK_TYPE_POINTER,
				 GTK_ARG_WRITABLE, ARG_TABLE_MODEL);
	gtk_object_add_arg_type ("ETableItem::x", GTK_TYPE_INT,
				 GTK_ARG_WRITABLE, ARG_TABLE_X);
	gtk_object_add_arg_type ("ETableItem::y", GTK_TYPE_INT,
				 GTK_ARG_WRITABLE, ARG_TABLE_Y);
	gtk_object_add_arg_type ("ETableItem::drawgrid", GTK_TYPE_BOOL,
				 GTK_ARG_WRITABLE, ARG_TABLE_DRAW_GRID);
}

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

	if (!type){
		GtkTypeInfo info = {
			"ETableItem",
			sizeof (ETableItem),
			sizeof (ETableItemClass),
			(GtkClassInitFunc) eti_class_init,
			(GtkObjectInitFunc) eti_init,
			NULL, /* reserved 1 */
			NULL, /* reserved 2 */
			(GtkClassInitFunc) NULL
		};

		type = gtk_type_unique (PARENT_OBJECT_TYPE, &info);
	}

	return type;
}

void
e_table_item_focus (ETableItem *eti, int col, int row)
{
	if (eti->focused_col != -1)
		e_table_item_unfocus (eti);

	eti->focused_col = col;
	eti->focused_row = row;	
}

void
e_table_item_unfocus (ETableItem *eti)
{
	eti->focused_col = -1;
	eti->focused_row = -1;	
}