/*
 * This program 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; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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 the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *		Chris Lahey <clahey@ximian.com>
 *		Chris Toshok <toshok@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

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

#include <stdlib.h>
#include <string.h>

#include <glib/gstdio.h>
#include <libxml/tree.h>
#include <libxml/parser.h>

#include <libedataserver/libedataserver.h>

#include "e-util/e-util.h"
#include "libevolution-utils/e-xml-utils.h"

#include "e-table-sorting-utils.h"
#include "e-tree-table-adapter.h"

#define E_TREE_TABLE_ADAPTER_GET_PRIVATE(obj) \
	(G_TYPE_INSTANCE_GET_PRIVATE \
	((obj), E_TYPE_TREE_TABLE_ADAPTER, ETreeTableAdapterPrivate))

/* workaround for avoiding API breakage */
#define etta_get_type e_tree_table_adapter_get_type
G_DEFINE_TYPE (ETreeTableAdapter, etta, E_TYPE_TABLE_MODEL)
#define d(x)

#define INCREMENT_AMOUNT 100

enum {
	SORTING_CHANGED,
	LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0, };

typedef struct {
	ETreePath path;
	guint32 num_visible_children;
	guint32 index;

	guint expanded : 1;
	guint expandable : 1;
	guint expandable_set : 1;
} node_t;

struct _ETreeTableAdapterPrivate {
	ETreeModel     *source;
	ETableSortInfo *sort_info;
	ETableHeader   *header;

	gint	     n_map;
	gint	     n_vals_allocated;
	node_t     **map_table;
	GHashTable  *nodes;
	GNode       *root;

	guint        root_visible : 1;
	guint        remap_needed : 1;

	gint          last_access;

	gint          pre_change_id;
	gint          no_change_id;
	gint	     rebuilt_id;
	gint          node_changed_id;
	gint          node_data_changed_id;
	gint          node_col_changed_id;
	gint          node_inserted_id;
	gint          node_removed_id;
	gint          node_request_collapse_id;
	gint          sort_info_changed_id;

	guint        resort_idle_id;

	gint          force_expanded_state; /* use this instead of model's default if not 0; <0 ... collapse, >0 ... expand */
};

static void etta_sort_info_changed (ETableSortInfo *sort_info, ETreeTableAdapter *etta);

static GNode *
lookup_gnode (ETreeTableAdapter *etta,
              ETreePath path)
{
	GNode *gnode;

	if (!path)
		return NULL;

	gnode = g_hash_table_lookup (etta->priv->nodes, path);

	return gnode;
}

static void
resize_map (ETreeTableAdapter *etta,
            gint size)
{
	if (size > etta->priv->n_vals_allocated) {
		etta->priv->n_vals_allocated = MAX (etta->priv->n_vals_allocated + INCREMENT_AMOUNT, size);
		etta->priv->map_table = g_renew (node_t *, etta->priv->map_table, etta->priv->n_vals_allocated);
	}

	etta->priv->n_map = size;
}

static void
move_map_elements (ETreeTableAdapter *etta,
                   gint to,
                   gint from,
                   gint count)
{
	if (count <= 0 || from >= etta->priv->n_map)
		return;
	memmove (etta->priv->map_table + to, etta->priv->map_table + from, count * sizeof (node_t *));
	etta->priv->remap_needed = TRUE;
}

static gint
fill_map (ETreeTableAdapter *etta,
          gint index,
          GNode *gnode)
{
	GNode *p;

	if ((gnode != etta->priv->root) || etta->priv->root_visible)
		etta->priv->map_table[index++] = gnode->data;

	for (p = gnode->children; p; p = p->next)
		index = fill_map (etta, index, p);

	etta->priv->remap_needed = TRUE;
	return index;
}

static void
remap_indices (ETreeTableAdapter *etta)
{
	gint i;
	for (i = 0; i < etta->priv->n_map; i++)
		etta->priv->map_table[i]->index = i;
	etta->priv->remap_needed = FALSE;
}

static node_t *
get_node (ETreeTableAdapter *etta,
          ETreePath path)
{
	GNode *gnode = lookup_gnode (etta, path);

	if (!gnode)
		return NULL;

	return (node_t *) gnode->data;
}

static void
resort_node (ETreeTableAdapter *etta,
             GNode *gnode,
             gboolean recurse)
{
	node_t *node = (node_t *) gnode->data;
	ETreePath *paths, path;
	GNode *prev, *curr;
	gint i, count;
	gboolean sort_needed;

	if (node->num_visible_children == 0)
		return;

	sort_needed = etta->priv->sort_info && e_table_sort_info_sorting_get_count (etta->priv->sort_info) > 0;

	for (i = 0, path = e_tree_model_node_get_first_child (etta->priv->source, node->path); path;
	     path = e_tree_model_node_get_next (etta->priv->source, path), i++);

	count = i;
	if (count <= 1)
		return;

	paths = g_new0 (ETreePath, count);

	for (i = 0, path = e_tree_model_node_get_first_child (etta->priv->source, node->path); path;
	     path = e_tree_model_node_get_next (etta->priv->source, path), i++)
		paths[i] = path;

	if (count > 1 && sort_needed)
		e_table_sorting_utils_tree_sort (etta->priv->source, etta->priv->sort_info, etta->priv->header, paths, count);

	prev = NULL;
	for (i = 0; i < count; i++) {
		curr = lookup_gnode (etta, paths[i]);
		if (!curr)
			continue;

		if (prev)
			prev->next = curr;
		else
			gnode->children = curr;

		curr->prev = prev;
		curr->next = NULL;
		prev = curr;
		if (recurse)
			resort_node (etta, curr, recurse);
	}

	g_free (paths);
}

static gint
get_row (ETreeTableAdapter *etta,
         ETreePath path)
{
	node_t *node = get_node (etta, path);
	if (!node)
		return -1;

	if (etta->priv->remap_needed)
		remap_indices (etta);

	return node->index;
}

static ETreePath
get_path (ETreeTableAdapter *etta,
          gint row)
{
	if (row == -1 && etta->priv->n_map > 0)
		row = etta->priv->n_map - 1;
	else if (row < 0 || row >= etta->priv->n_map)
		return NULL;

	return etta->priv->map_table[row]->path;
}

static void
kill_gnode (GNode *node,
            ETreeTableAdapter *etta)
{
	g_hash_table_remove (etta->priv->nodes, ((node_t *) node->data)->path);

	while (node->children) {
		GNode *next = node->children->next;
		kill_gnode (node->children, etta);
		node->children = next;
	}

	g_free (node->data);
	if (node == etta->priv->root)
		etta->priv->root = NULL;
	g_node_destroy (node);
}

static void
update_child_counts (GNode *gnode,
                     gint delta)
{
	while (gnode) {
		node_t *node = (node_t *) gnode->data;
		node->num_visible_children += delta;
		gnode = gnode->parent;
	}
}

static gint
delete_children (ETreeTableAdapter *etta,
                 GNode *gnode)
{
	node_t *node = (node_t *) gnode->data;
	gint to_remove = node ? node->num_visible_children : 0;

	if (to_remove == 0)
		return 0;

	while (gnode->children) {
		GNode *next = gnode->children->next;
		kill_gnode (gnode->children, etta);
		gnode->children = next;
	}

	return to_remove;
}

static void
delete_node (ETreeTableAdapter *etta,
             ETreePath parent,
             ETreePath path)
{
	gint to_remove = 1;
	gint parent_row = get_row (etta, parent);
	gint row = get_row (etta, path);
	GNode *gnode = lookup_gnode (etta, path);
	GNode *parent_gnode = lookup_gnode (etta, parent);

	e_table_model_pre_change (E_TABLE_MODEL (etta));

	if (row == -1) {
		e_table_model_no_change (E_TABLE_MODEL (etta));
		return;
	}

	to_remove += delete_children (etta, gnode);
	kill_gnode (gnode, etta);

	move_map_elements (etta, row, row + to_remove, etta->priv->n_map - row - to_remove);
	resize_map (etta, etta->priv->n_map - to_remove);

	if (parent_gnode != NULL) {
		node_t *parent_node = parent_gnode->data;
		gboolean expandable = e_tree_model_node_is_expandable (etta->priv->source, parent);

		update_child_counts (parent_gnode, - to_remove);
		if (parent_node->expandable != expandable) {
			e_table_model_pre_change (E_TABLE_MODEL (etta));
			parent_node->expandable = expandable;
			e_table_model_row_changed (E_TABLE_MODEL (etta), parent_row);
		}

		resort_node (etta, parent_gnode, FALSE);
	}

	e_table_model_rows_deleted (E_TABLE_MODEL (etta), row, to_remove);
}

static GNode *
create_gnode (ETreeTableAdapter *etta,
              ETreePath path)
{
	GNode *gnode;
	node_t *node;

	node = g_new0 (node_t, 1);
	node->path = path;
	node->index = -1;
	node->expanded = etta->priv->force_expanded_state == 0 ? e_tree_model_get_expanded_default (etta->priv->source) : etta->priv->force_expanded_state > 0;
	node->expandable = e_tree_model_node_is_expandable (etta->priv->source, path);
	node->expandable_set = 1;
	node->num_visible_children = 0;
	gnode = g_node_new (node);
	g_hash_table_insert (etta->priv->nodes, path, gnode);
	return gnode;
}

static gint
insert_children (ETreeTableAdapter *etta,
                 GNode *gnode)
{
	ETreePath path, tmp;
	gint count = 0;
	gint pos = 0;

	path = ((node_t *) gnode->data)->path;
	for (tmp = e_tree_model_node_get_first_child (etta->priv->source, path);
	     tmp;
	     tmp = e_tree_model_node_get_next (etta->priv->source, tmp), pos++) {
		GNode *child = create_gnode (etta, tmp);
		node_t *node = (node_t *) child->data;
		if (node->expanded)
			node->num_visible_children = insert_children (etta, child);
		g_node_prepend (gnode, child);
		count += node->num_visible_children + 1;
	}
	g_node_reverse_children (gnode);
	return count;
}

static void
generate_tree (ETreeTableAdapter *etta,
               ETreePath path)
{
	GNode *gnode;
	node_t *node;
	gint size;

	e_table_model_pre_change (E_TABLE_MODEL (etta));

	g_return_if_fail (e_tree_model_node_is_root (etta->priv->source, path));

	if (etta->priv->root)
		kill_gnode (etta->priv->root, etta);
	resize_map (etta, 0);

	gnode = create_gnode (etta, path);
	node = (node_t *) gnode->data;
	node->expanded = TRUE;
	node->num_visible_children = insert_children (etta, gnode);
	if (etta->priv->sort_info && e_table_sort_info_sorting_get_count (etta->priv->sort_info) > 0)
		resort_node (etta, gnode, TRUE);

	etta->priv->root = gnode;
	size =  etta->priv->root_visible ? node->num_visible_children + 1 : node->num_visible_children;
	resize_map (etta, size);
	fill_map (etta, 0, gnode);
	e_table_model_changed (E_TABLE_MODEL (etta));
}

static void
insert_node (ETreeTableAdapter *etta,
             ETreePath parent,
             ETreePath path)
{
	GNode *gnode, *parent_gnode;
	node_t *node, *parent_node;
	gboolean expandable;
	gint size, row;

	e_table_model_pre_change (E_TABLE_MODEL (etta));

	if (get_node (etta, path)) {
		e_table_model_no_change (E_TABLE_MODEL (etta));
		return;
	}

	parent_gnode = lookup_gnode (etta, parent);
	if (!parent_gnode) {
		ETreePath grandparent = e_tree_model_node_get_parent (etta->priv->source, parent);
		if (e_tree_model_node_is_root (etta->priv->source, parent))
			generate_tree (etta, parent);
		else
			insert_node (etta, grandparent, parent);
		e_table_model_changed (E_TABLE_MODEL (etta));
		return;
	}

	parent_node = (node_t *) parent_gnode->data;

	if (parent_gnode != etta->priv->root) {
		expandable = e_tree_model_node_is_expandable (etta->priv->source, parent);
		if (parent_node->expandable != expandable) {
			e_table_model_pre_change (E_TABLE_MODEL (etta));
			parent_node->expandable = expandable;
			parent_node->expandable_set = 1;
			e_table_model_row_changed (E_TABLE_MODEL (etta), parent_node->index);
		}
	}

	if (!e_tree_table_adapter_node_is_expanded (etta, parent)) {
		e_table_model_no_change (E_TABLE_MODEL (etta));
		return;
	}

	gnode = create_gnode (etta, path);
	node = (node_t *) gnode->data;

	if (node->expanded)
		node->num_visible_children = insert_children (etta, gnode);

	g_node_append (parent_gnode, gnode);
	update_child_counts (parent_gnode, node->num_visible_children + 1);
	resort_node (etta, parent_gnode, FALSE);
	resort_node (etta, gnode, TRUE);

	size = node->num_visible_children + 1;
	resize_map (etta, etta->priv->n_map + size);
	if (parent_gnode == etta->priv->root)
		row = 0;
	else {
		gint new_size = parent_node->num_visible_children + 1;
		gint old_size = new_size - size;
		row = parent_node->index;
		move_map_elements (etta, row + new_size, row + old_size, etta->priv->n_map - row - new_size);
	}
	fill_map (etta, row, parent_gnode);
	e_table_model_rows_inserted (E_TABLE_MODEL (etta), get_row (etta, path), size);
}

typedef struct {
	GSList *paths;
	gboolean expanded;
} check_expanded_closure;

static gboolean
check_expanded (GNode *gnode,
                gpointer data)
{
	check_expanded_closure *closure = (check_expanded_closure *) data;
	node_t *node = (node_t *) gnode->data;

	if (node->expanded != closure->expanded)
		closure->paths = g_slist_prepend (closure->paths, node->path);

	return FALSE;
}

static void
update_node (ETreeTableAdapter *etta,
             ETreePath path)
{
	check_expanded_closure closure;
	ETreePath parent = e_tree_model_node_get_parent (etta->priv->source, path);
	GNode *gnode = lookup_gnode (etta, path);
	GSList *l;

	closure.expanded = e_tree_model_get_expanded_default (etta->priv->source);
	closure.paths = NULL;

	if (gnode)
		g_node_traverse (gnode, G_POST_ORDER, G_TRAVERSE_ALL, -1, check_expanded, &closure);

	if (e_tree_model_node_is_root (etta->priv->source, path))
		generate_tree (etta, path);
	else {
		delete_node (etta, parent, path);
		insert_node (etta, parent, path);
	}

	for (l = closure.paths; l; l = l->next)
		if (lookup_gnode (etta, l->data))
			e_tree_table_adapter_node_set_expanded (etta, l->data, !closure.expanded);

	g_slist_free (closure.paths);
}

static void
etta_finalize (GObject *object)
{
	ETreeTableAdapterPrivate *priv;

	priv = E_TREE_TABLE_ADAPTER_GET_PRIVATE (object);

	if (priv->resort_idle_id) {
		g_source_remove (priv->resort_idle_id);
		priv->resort_idle_id = 0;
	}

	if (priv->root) {
		kill_gnode (priv->root, E_TREE_TABLE_ADAPTER (object));
		priv->root = NULL;
	}

	g_hash_table_destroy (priv->nodes);

	g_free (priv->map_table);

	/* Chain up to parent's finalize() method. */
	G_OBJECT_CLASS (etta_parent_class)->finalize (object);
}

static void
etta_dispose (GObject *object)
{
	ETreeTableAdapterPrivate *priv;

	priv = E_TREE_TABLE_ADAPTER_GET_PRIVATE (object);

	if (priv->sort_info) {
		g_signal_handler_disconnect (
			priv->sort_info, priv->sort_info_changed_id);
		g_object_unref (priv->sort_info);
		priv->sort_info = NULL;
	}

	if (priv->header) {
		g_object_unref (priv->header);
		priv->header = NULL;
	}

	if (priv->source) {
		g_signal_handler_disconnect (
			priv->source, priv->pre_change_id);
		g_signal_handler_disconnect (
			priv->source, priv->no_change_id);
		g_signal_handler_disconnect (
			priv->source, priv->rebuilt_id);
		g_signal_handler_disconnect (
			priv->source, priv->node_changed_id);
		g_signal_handler_disconnect (
			priv->source, priv->node_data_changed_id);
		g_signal_handler_disconnect (
			priv->source, priv->node_col_changed_id);
		g_signal_handler_disconnect (
			priv->source, priv->node_inserted_id);
		g_signal_handler_disconnect (
			priv->source, priv->node_removed_id);
		g_signal_handler_disconnect (
			priv->source, priv->node_request_collapse_id);

		g_object_unref (priv->source);
		priv->source = NULL;
	}

	/* Chain up to parent's dispose() method. */
	G_OBJECT_CLASS (etta_parent_class)->dispose (object);
}

static gint
etta_column_count (ETableModel *etm)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_column_count (etta->priv->source);
}

static gboolean
etta_has_save_id (ETableModel *etm)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_has_save_id (etta->priv->source);
}

static gchar *
etta_get_save_id (ETableModel *etm,
                  gint row)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_get_save_id (etta->priv->source, get_path (etta, row));
}

static gboolean
etta_has_change_pending (ETableModel *etm)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_has_change_pending (etta->priv->source);
}

static gint
etta_row_count (ETableModel *etm)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return etta->priv->n_map;
}

static gpointer
etta_value_at (ETableModel *etm,
               gint col,
               gint row)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	switch (col) {
	case -1:
		if (row == -1)
			return NULL;
		return get_path (etta, row);
	case -2:
		return etta->priv->source;
	case -3:
		return etta;
	default:
		return e_tree_model_value_at (etta->priv->source, get_path (etta, row), col);
	}
}

static void
etta_set_value_at (ETableModel *etm,
                   gint col,
                   gint row,
                   gconstpointer val)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	e_tree_model_set_value_at (etta->priv->source, get_path (etta, row), col, val);
}

static gboolean
etta_is_cell_editable (ETableModel *etm,
                       gint col,
                       gint row)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_node_is_editable (etta->priv->source, get_path (etta, row), col);
}

static void
etta_append_row (ETableModel *etm,
                 ETableModel *source,
                 gint row)
{
}

static gpointer
etta_duplicate_value (ETableModel *etm,
                      gint col,
                      gconstpointer value)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_duplicate_value (etta->priv->source, col, value);
}

static void
etta_free_value (ETableModel *etm,
                 gint col,
                 gpointer value)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	e_tree_model_free_value (etta->priv->source, col, value);
}

static gpointer
etta_initialize_value (ETableModel *etm,
                       gint col)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_initialize_value (etta->priv->source, col);
}

static gboolean
etta_value_is_empty (ETableModel *etm,
                     gint col,
                     gconstpointer value)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_value_is_empty (etta->priv->source, col, value);
}

static gchar *
etta_value_to_string (ETableModel *etm,
                      gint col,
                      gconstpointer value)
{
	ETreeTableAdapter *etta = (ETreeTableAdapter *) etm;

	return e_tree_model_value_to_string (etta->priv->source, col, value);
}

static void
etta_class_init (ETreeTableAdapterClass *class)
{
	GObjectClass *object_class;
	ETableModelClass *table_model_class;

	g_type_class_add_private (class, sizeof (ETreeTableAdapterPrivate));

	object_class = G_OBJECT_CLASS (class);
	object_class->dispose = etta_dispose;
	object_class->finalize = etta_finalize;

	table_model_class = E_TABLE_MODEL_CLASS (class);
	table_model_class->column_count = etta_column_count;
	table_model_class->row_count = etta_row_count;
	table_model_class->append_row = etta_append_row;

	table_model_class->value_at = etta_value_at;
	table_model_class->set_value_at = etta_set_value_at;
	table_model_class->is_cell_editable = etta_is_cell_editable;

	table_model_class->has_save_id = etta_has_save_id;
	table_model_class->get_save_id = etta_get_save_id;

	table_model_class->has_change_pending = etta_has_change_pending;
	table_model_class->duplicate_value = etta_duplicate_value;
	table_model_class->free_value = etta_free_value;
	table_model_class->initialize_value = etta_initialize_value;
	table_model_class->value_is_empty = etta_value_is_empty;
	table_model_class->value_to_string = etta_value_to_string;

	class->sorting_changed = NULL;

	signals[SORTING_CHANGED] =
		g_signal_new ("sorting_changed",
			      G_OBJECT_CLASS_TYPE (object_class),
			      G_SIGNAL_RUN_LAST,
			      G_STRUCT_OFFSET (ETreeTableAdapterClass, sorting_changed),
			      NULL, NULL,
			      e_marshal_BOOLEAN__NONE,
			      G_TYPE_BOOLEAN, 0, G_TYPE_NONE);
}

static void
etta_init (ETreeTableAdapter *etta)
{
	etta->priv = E_TREE_TABLE_ADAPTER_GET_PRIVATE (etta);

	etta->priv->root_visible = TRUE;
	etta->priv->remap_needed = TRUE;
}

static void
etta_proxy_pre_change (ETreeModel *etm,
                       ETreeTableAdapter *etta)
{
	e_table_model_pre_change (E_TABLE_MODEL (etta));
}

static void
etta_proxy_no_change (ETreeModel *etm,
                      ETreeTableAdapter *etta)
{
	e_table_model_no_change (E_TABLE_MODEL (etta));
}

static void
etta_proxy_rebuilt (ETreeModel *etm,
                    ETreeTableAdapter *etta)
{
	if (!etta->priv->root)
		return;
	kill_gnode (etta->priv->root, etta);
	etta->priv->root = NULL;
	g_hash_table_destroy (etta->priv->nodes);
	etta->priv->nodes = g_hash_table_new (NULL, NULL);
}

static gboolean
resort_model (ETreeTableAdapter *etta)
{
	etta_sort_info_changed (NULL, etta);
	etta->priv->resort_idle_id = 0;
	return FALSE;
}

static void
etta_proxy_node_changed (ETreeModel *etm,
                         ETreePath path,
                         ETreeTableAdapter *etta)
{
	update_node (etta, path);
	e_table_model_changed (E_TABLE_MODEL (etta));

	/* FIXME: Really it shouldnt be required. But a lot of thread
	 * which were supposed to be present in the list is way below
	 */
	if (!etta->priv->resort_idle_id)
		etta->priv->resort_idle_id = g_idle_add ((GSourceFunc) resort_model, etta);
}

static void
etta_proxy_node_data_changed (ETreeModel *etm,
                              ETreePath path,
                              ETreeTableAdapter *etta)
{
	gint row = get_row (etta, path);

	if (row == -1) {
		e_table_model_no_change (E_TABLE_MODEL (etta));
		return;
	}

	e_table_model_row_changed (E_TABLE_MODEL (etta), row);
}

static void
etta_proxy_node_col_changed (ETreeModel *etm,
                             ETreePath path,
                             gint col,
                             ETreeTableAdapter *etta)
{
	gint row = get_row (etta, path);

	if (row == -1) {
		e_table_model_no_change (E_TABLE_MODEL (etta));
		return;
	}

	e_table_model_cell_changed (E_TABLE_MODEL (etta), col, row);
}

static void
etta_proxy_node_inserted (ETreeModel *etm,
                          ETreePath parent,
                          ETreePath child,
                          ETreeTableAdapter *etta)
{
	if (e_tree_model_node_is_root (etm, child))
		generate_tree (etta, child);
	else
		insert_node (etta, parent, child);

	e_table_model_changed (E_TABLE_MODEL (etta));
}

static void
etta_proxy_node_removed (ETreeModel *etm,
                         ETreePath parent,
                         ETreePath child,
                         gint old_position,
                         ETreeTableAdapter *etta)
{
	delete_node (etta, parent, child);
	e_table_model_changed (E_TABLE_MODEL (etta));
}

static void
etta_proxy_node_request_collapse (ETreeModel *etm,
                                  ETreePath node,
                                  ETreeTableAdapter *etta)
{
	e_tree_table_adapter_node_set_expanded (etta, node, FALSE);
}

static void
etta_sort_info_changed (ETableSortInfo *sort_info,
                        ETreeTableAdapter *etta)
{
	if (!etta->priv->root)
		return;

	/* the function is called also internally, with sort_info = NULL,
	 * thus skip those in signal emit */
	if (sort_info) {
		gboolean handled = FALSE;

		g_signal_emit (etta, signals[SORTING_CHANGED], 0, &handled);

		if (handled)
			return;
	}

	e_table_model_pre_change (E_TABLE_MODEL (etta));
	resort_node (etta, etta->priv->root, TRUE);
	fill_map (etta, 0, etta->priv->root);
	e_table_model_changed (E_TABLE_MODEL (etta));
}

ETableModel *
e_tree_table_adapter_construct (ETreeTableAdapter *etta,
                                ETreeModel *source,
                                ETableSortInfo *sort_info,
                                ETableHeader *header)
{
	ETreePath root;

	etta->priv->source = source;
	g_object_ref (source);

	etta->priv->sort_info = sort_info;
	if (sort_info) {
		g_object_ref (sort_info);
		etta->priv->sort_info_changed_id = g_signal_connect (
			sort_info, "sort_info_changed",
			G_CALLBACK (etta_sort_info_changed), etta);
	}

	etta->priv->header = header;
	if (header)
		g_object_ref (header);

	etta->priv->nodes = g_hash_table_new (NULL, NULL);

	root = e_tree_model_get_root (source);

	if (root)
		generate_tree (etta, root);

	etta->priv->pre_change_id = g_signal_connect (
		source, "pre_change",
		G_CALLBACK (etta_proxy_pre_change), etta);
	etta->priv->no_change_id = g_signal_connect (
		source, "no_change",
		G_CALLBACK (etta_proxy_no_change), etta);
	etta->priv->rebuilt_id = g_signal_connect (
		source, "rebuilt",
		G_CALLBACK (etta_proxy_rebuilt), etta);
	etta->priv->node_changed_id = g_signal_connect (
		source, "node_changed",
		G_CALLBACK (etta_proxy_node_changed), etta);
	etta->priv->node_data_changed_id = g_signal_connect (
		source, "node_data_changed",
		G_CALLBACK (etta_proxy_node_data_changed), etta);
	etta->priv->node_col_changed_id = g_signal_connect (
		source, "node_col_changed",
		G_CALLBACK (etta_proxy_node_col_changed), etta);
	etta->priv->node_inserted_id = g_signal_connect (
		source, "node_inserted",
		G_CALLBACK (etta_proxy_node_inserted), etta);
	etta->priv->node_removed_id = g_signal_connect (
		source, "node_removed",
		G_CALLBACK (etta_proxy_node_removed), etta);
	etta->priv->node_request_collapse_id = g_signal_connect (
		source, "node_request_collapse",
		G_CALLBACK (etta_proxy_node_request_collapse), etta);

	return E_TABLE_MODEL (etta);
}

ETableModel *
e_tree_table_adapter_new (ETreeModel *source,
                          ETableSortInfo *sort_info,
                          ETableHeader *header)
{
	ETreeTableAdapter *etta = g_object_new (E_TYPE_TREE_TABLE_ADAPTER, NULL);

	e_tree_table_adapter_construct (etta, source, sort_info, header);

	return (ETableModel *) etta;
}

typedef struct {
	xmlNode *root;
	gboolean expanded_default;
	ETreeModel *model;
} TreeAndRoot;

static void
save_expanded_state_func (gpointer keyp,
                          gpointer value,
                          gpointer data)
{
	ETreePath path = keyp;
	node_t *node = ((GNode *) value)->data;
	TreeAndRoot *tar = data;
	xmlNode *xmlnode;

	if (node->expanded != tar->expanded_default) {
		gchar *save_id = e_tree_model_get_save_id (tar->model, path);
		xmlnode = xmlNewChild (tar->root, NULL, (const guchar *)"node", NULL);
		e_xml_set_string_prop_by_name (xmlnode, (const guchar *)"id", save_id);
		g_free (save_id);
	}
}

xmlDoc *
e_tree_table_adapter_save_expanded_state_xml (ETreeTableAdapter *etta)
{
	TreeAndRoot tar;
	xmlDocPtr doc;
	xmlNode *root;

	g_return_val_if_fail (etta != NULL, NULL);

	doc = xmlNewDoc ((const guchar *)"1.0");
	root = xmlNewDocNode (doc, NULL, (const guchar *)"expanded_state", NULL);
	xmlDocSetRootElement (doc, root);

	tar.model = etta->priv->source;
	tar.root = root;
	tar.expanded_default = e_tree_model_get_expanded_default (etta->priv->source);

	e_xml_set_integer_prop_by_name (root, (const guchar *)"vers", 2);
	e_xml_set_bool_prop_by_name (root, (const guchar *)"default", tar.expanded_default);

	g_hash_table_foreach (etta->priv->nodes, save_expanded_state_func, &tar);

	return doc;
}

void
e_tree_table_adapter_save_expanded_state (ETreeTableAdapter *etta,
                                          const gchar *filename)
{
	xmlDoc *doc;

	g_return_if_fail (etta != NULL);

	doc = e_tree_table_adapter_save_expanded_state_xml (etta);
	if (doc) {
		e_xml_save_file (filename, doc);
		xmlFreeDoc (doc);
	}
}

static xmlDoc *
open_file (ETreeTableAdapter *etta,
           const gchar *filename)
{
	xmlDoc *doc;
	xmlNode *root;
	gint vers;
	gboolean model_default, saved_default;

	if (!g_file_test (filename, G_FILE_TEST_EXISTS))
		return NULL;

#ifdef G_OS_WIN32
	{
		gchar *locale_filename = g_win32_locale_filename_from_utf8 (filename);
		doc = xmlParseFile (locale_filename);
		g_free (locale_filename);
	}
#else
	doc = xmlParseFile (filename);
#endif

	if (!doc)
		return NULL;

	root = xmlDocGetRootElement (doc);
	if (root == NULL || strcmp ((gchar *) root->name, "expanded_state")) {
		xmlFreeDoc (doc);
		return NULL;
	}

	vers = e_xml_get_integer_prop_by_name_with_default (root, (const guchar *)"vers", 0);
	if (vers > 2) {
		xmlFreeDoc (doc);
		return NULL;
	}
	model_default = e_tree_model_get_expanded_default (etta->priv->source);
	saved_default = e_xml_get_bool_prop_by_name_with_default (root, (const guchar *)"default", !model_default);
	if (saved_default != model_default) {
		xmlFreeDoc (doc);
		return NULL;
	}

	return doc;
}

/* state: <0 ... collapse;  0 ... use default; >0 ... expand */
void
e_tree_table_adapter_force_expanded_state (ETreeTableAdapter *etta,
                                           gint state)
{
	g_return_if_fail (etta != NULL);

	etta->priv->force_expanded_state = state;
}

void
e_tree_table_adapter_load_expanded_state_xml (ETreeTableAdapter *etta,
                                              xmlDoc *doc)
{
	xmlNode *root, *child;
	gboolean model_default;
	gboolean file_default = FALSE;

	g_return_if_fail (etta != NULL);
	g_return_if_fail (doc != NULL);

	root = xmlDocGetRootElement (doc);

	e_table_model_pre_change (E_TABLE_MODEL (etta));

	model_default = e_tree_model_get_expanded_default (etta->priv->source);

	if (!strcmp ((gchar *) root->name, "expanded_state")) {
		gchar *state;

		state = e_xml_get_string_prop_by_name_with_default (root, (const guchar *)"default", "");

		if (state[0] == 't')
			file_default = TRUE;
		else
			file_default = FALSE; /* Even unspecified we'll consider as false */

		g_free (state);
	}

	/* Incase the default is changed, lets forget the changes and stick to default */

	if (file_default != model_default) {
		xmlFreeDoc (doc);
		return;
	}

	for (child = root->xmlChildrenNode; child; child = child->next) {
		gchar *id;
		ETreePath path;

		if (strcmp ((gchar *) child->name, "node")) {
			d (g_warning ("unknown node '%s' in %s", child->name, filename));
			continue;
		}

		id = e_xml_get_string_prop_by_name_with_default (child, (const guchar *)"id", "");

		if (!strcmp (id, "")) {
			g_free (id);
			continue;
		}

		path = e_tree_model_get_node_by_id (etta->priv->source, id);
		if (path)
			e_tree_table_adapter_node_set_expanded (etta, path, !model_default);

		g_free (id);
	}

	e_table_model_changed (E_TABLE_MODEL (etta));
}

void
e_tree_table_adapter_load_expanded_state (ETreeTableAdapter *etta,
                                          const gchar *filename)
{
	xmlDoc *doc;

	g_return_if_fail (etta != NULL);

	doc = open_file (etta, filename);
	if (!doc)
		return;

	e_tree_table_adapter_load_expanded_state_xml  (etta, doc);

	xmlFreeDoc (doc);
}

void
e_tree_table_adapter_root_node_set_visible (ETreeTableAdapter *etta,
                                            gboolean visible)
{
	gint size;

	g_return_if_fail (etta != NULL);

	if (etta->priv->root_visible == visible)
		return;

	e_table_model_pre_change (E_TABLE_MODEL (etta));

	etta->priv->root_visible = visible;
	if (!visible) {
		ETreePath root = e_tree_model_get_root (etta->priv->source);
		if (root)
			e_tree_table_adapter_node_set_expanded (etta, root, TRUE);
	}
	size = (visible ? 1 : 0) + (etta->priv->root ? ((node_t *) etta->priv->root->data)->num_visible_children : 0);
	resize_map (etta, size);
	if (etta->priv->root)
		fill_map (etta, 0, etta->priv->root);
	e_table_model_changed (E_TABLE_MODEL (etta));
}

void
e_tree_table_adapter_node_set_expanded (ETreeTableAdapter *etta,
                                        ETreePath path,
                                        gboolean expanded)
{
	GNode *gnode = lookup_gnode (etta, path);
	node_t *node;
	gint row;

	if (!expanded && (!gnode || (e_tree_model_node_is_root (etta->priv->source, path) && !etta->priv->root_visible)))
		return;

	if (!gnode && expanded) {
		ETreePath parent = e_tree_model_node_get_parent (etta->priv->source, path);
		g_return_if_fail (parent != NULL);
		e_tree_table_adapter_node_set_expanded (etta, parent, expanded);
		gnode = lookup_gnode (etta, path);
	}
	g_return_if_fail (gnode != NULL);

	node = (node_t *) gnode->data;

	if (expanded == node->expanded)
		return;

	node->expanded = expanded;

	row = get_row (etta, path);
	if (row == -1)
		return;

	e_table_model_pre_change (E_TABLE_MODEL (etta));
	e_table_model_pre_change (E_TABLE_MODEL (etta));
	e_table_model_row_changed (E_TABLE_MODEL (etta), row);

	if (expanded) {
		gint num_children = insert_children (etta, gnode);
		update_child_counts (gnode, num_children);
		if (etta->priv->sort_info && e_table_sort_info_sorting_get_count (etta->priv->sort_info) > 0)
			resort_node (etta, gnode, TRUE);
		resize_map (etta, etta->priv->n_map + num_children);
		move_map_elements (etta, row + 1 + num_children, row + 1, etta->priv->n_map - row - 1 - num_children);
		fill_map (etta, row, gnode);
		if (num_children != 0) {
			e_table_model_rows_inserted (E_TABLE_MODEL (etta), row + 1, num_children);
		} else
			e_table_model_no_change (E_TABLE_MODEL (etta));
	} else {
		gint num_children = delete_children (etta, gnode);
		if (num_children == 0) {
			e_table_model_no_change (E_TABLE_MODEL (etta));
			return;
		}
		move_map_elements (etta, row + 1, row + 1 + num_children, etta->priv->n_map - row - 1 - num_children);
		update_child_counts (gnode, - num_children);
		resize_map (etta, etta->priv->n_map - num_children);
		e_table_model_rows_deleted (E_TABLE_MODEL (etta), row + 1, num_children);
	}
}

void
e_tree_table_adapter_node_set_expanded_recurse (ETreeTableAdapter *etta,
                                                ETreePath path,
                                                gboolean expanded)
{
	ETreePath children;

	e_tree_table_adapter_node_set_expanded (etta, path, expanded);

	for (children = e_tree_model_node_get_first_child (etta->priv->source, path);
	     children;
	     children = e_tree_model_node_get_next (etta->priv->source, children)) {
		e_tree_table_adapter_node_set_expanded_recurse (etta, children, expanded);
	}
}

ETreePath
e_tree_table_adapter_node_at_row (ETreeTableAdapter *etta,
                                  gint row)
{
	return get_path (etta, row);
}

gint
e_tree_table_adapter_row_of_node (ETreeTableAdapter *etta,
                                  ETreePath path)
{
	return get_row (etta, path);
}

gboolean
e_tree_table_adapter_root_node_is_visible (ETreeTableAdapter *etta)
{
	return etta->priv->root_visible;
}

void
e_tree_table_adapter_show_node (ETreeTableAdapter *etta,
                                ETreePath path)
{
	ETreePath parent;

	parent = e_tree_model_node_get_parent (etta->priv->source, path);

	while (parent) {
		e_tree_table_adapter_node_set_expanded (etta, parent, TRUE);
		parent = e_tree_model_node_get_parent (etta->priv->source, parent);
	}
}

gboolean
e_tree_table_adapter_node_is_expanded (ETreeTableAdapter *etta,
                                       ETreePath path)
{
	node_t *node = get_node (etta, path);
	if (!e_tree_model_node_is_expandable (etta->priv->source, path) || !node)
		return FALSE;

	return node->expanded;
}

void
e_tree_table_adapter_set_sort_info (ETreeTableAdapter *etta,
                                    ETableSortInfo *sort_info)
{
	if (etta->priv->sort_info) {
		g_signal_handler_disconnect (G_OBJECT (etta->priv->sort_info),
					    etta->priv->sort_info_changed_id);
		g_object_unref (etta->priv->sort_info);
	}

	etta->priv->sort_info = sort_info;
	if (sort_info) {
		g_object_ref (sort_info);
		etta->priv->sort_info_changed_id = g_signal_connect (
			sort_info, "sort_info_changed",
			G_CALLBACK (etta_sort_info_changed), etta);
	}

	if (!etta->priv->root)
		return;

	e_table_model_pre_change (E_TABLE_MODEL (etta));
	resort_node (etta, etta->priv->root, TRUE);
	fill_map (etta, 0, etta->priv->root);
	e_table_model_changed (E_TABLE_MODEL (etta));
}

ETableSortInfo *
e_tree_table_adapter_get_sort_info (ETreeTableAdapter *etta)
{
	g_return_val_if_fail (etta != NULL, NULL);

	return etta->priv->sort_info;
}

ETableHeader *
e_tree_table_adapter_get_header (ETreeTableAdapter *etta)
{
	g_return_val_if_fail (etta != NULL, NULL);

	return etta->priv->header;
}

ETreePath
e_tree_table_adapter_node_get_next (ETreeTableAdapter *etta,
                                    ETreePath path)
{
	GNode *node = lookup_gnode (etta, path);

	if (node && node->next)
		return ((node_t *) node->next->data)->path;

	return NULL;
}