/*
 *  Copyright (C) 2000 Helix Code Inc.
 *
 *  Authors: Not Zed <notzed@lostzed.mmc.com.au>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public License
 *  as published by the Free Software Foundation; either version 2 of
 *  the License, or (at your option) any later version.
 *
 *  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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <config.h>

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

#include <glib.h>
#include <gtk/gtkbox.h>
#include <gtk/gtkhbox.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-i18n.h>
#include <gal/widgets/e-unicode.h>

#include "filter-part.h"
#include "filter-element.h"


#define d(x)

static void filter_part_class_init	(FilterPartClass *class);
static void filter_part_init	(FilterPart *gspaper);
static void filter_part_finalise	(GtkObject *obj);

#define _PRIVATE(x) (((FilterPart *)(x))->priv)

struct _FilterPartPrivate {
};

static GtkObjectClass *parent_class;

enum {
	LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

guint
filter_part_get_type (void)
{
	static guint type = 0;
	
	if (!type) {
		GtkTypeInfo type_info = {
			"FilterPart",
			sizeof(FilterPart),
			sizeof(FilterPartClass),
			(GtkClassInitFunc)filter_part_class_init,
			(GtkObjectInitFunc)filter_part_init,
			(GtkArgSetFunc)NULL,
			(GtkArgGetFunc)NULL
		};
		
		type = gtk_type_unique(gtk_object_get_type (), &type_info);
	}
	
	return type;
}

static void
filter_part_class_init (FilterPartClass *class)
{
	GtkObjectClass *object_class;
	
	object_class = (GtkObjectClass *)class;
	parent_class = gtk_type_class (gtk_object_get_type ());
	
	object_class->finalize = filter_part_finalise;
	/* override methods */
	
	/* signals */
	
	gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);
}

static void
filter_part_init (FilterPart *o)
{
	o->priv = g_malloc0 (sizeof (*o->priv));
}

static void
filter_part_finalise(GtkObject *obj)
{
	FilterPart *o = (FilterPart *)obj;
	GList *l;

	o = o;

	l = o->elements;
	while (l) {
		gtk_object_unref((GtkObject *)l->data);
		l = g_list_next(l);
	}

	g_list_free(o->elements);
	g_free(o->name);
	g_free(o->title);
	g_free(o->code);

	
        ((GtkObjectClass *)(parent_class))->finalize(obj);
}

/**
 * filter_part_new:
 *
 * Create a new FilterPart object.
 * 
 * Return value: A new #FilterPart object.
 **/
FilterPart *
filter_part_new (void)
{
	FilterPart *o = (FilterPart *)gtk_type_new(filter_part_get_type ());
	return o;
}

gboolean
filter_part_validate (FilterPart *fp)
{
	gboolean correct = TRUE;
	GList *l;
	
	l = fp->elements;
	while (l && correct) {
		FilterElement *fe = l->data;
		
	        correct = filter_element_validate (fe);
		
		l = l->next;
	}
	
	return correct;
}

int
filter_part_xml_create (FilterPart *ff, xmlNodePtr node)
{
	xmlNodePtr n;
	char *type, *str, *decstr;
	FilterElement *el;
	
	str = xmlGetProp(node, "name");
	ff->name = g_strdup(str);
	if (str)
		xmlFree(str);
	n = node->childs;
	while (n) {
		if (!strcmp (n->name, "input")) {
			type = xmlGetProp (n, "type");
			d(printf ("creating new element type input '%s'\n", type));
			if (type != NULL
			    && (el = filter_element_new_type_name (type)) != NULL) {
				filter_element_xml_create (el, n);
				xmlFree(type);
				d(printf ("adding element part %p %s\n", ff, el, el->name));
				ff->elements = g_list_append (ff->elements, el);
			} else {
				g_warning ("Invalid xml format, missing/unknown input type");
			}
		} else if (!strcmp(n->name, "title")) {
			if (!ff->title) {
				str = xmlNodeGetContent (n);
				ff->title = e_utf8_xml1_decode (str);
				if (str)
					xmlFree (str);
			}
		} else if (!strcmp (n->name, "code")) {
			if (!ff->code) {
				str = xmlNodeGetContent (n);
				ff->code = e_utf8_xml1_decode (str);
				if (str)
					xmlFree (str);
			}
		} else {
			g_warning ("Unknwon part element in xml: %s\n", n->name);
		}
		n = n->next;
	}
	
	return 0;
}

xmlNodePtr
filter_part_xml_encode (FilterPart *fp)
{
	GList *l;
	FilterElement *fe;
	xmlNodePtr part, value;
	
	g_return_val_if_fail (fp != NULL, NULL);
	
	part = xmlNewNode (NULL, "part");
	xmlSetProp (part, "name", fp->name);
	l = fp->elements;
	while (l) {
		fe = l->data;
		value = filter_element_xml_encode (fe);
		xmlAddChild (part, value);
		l = g_list_next (l);
	}
	
	return part;
}


int
filter_part_xml_decode (FilterPart *fp, xmlNodePtr node)
{
	FilterElement *fe;
	xmlNodePtr n;
	char *name;
	
	g_return_val_if_fail (fp != NULL, -1);
	g_return_val_if_fail (node != NULL, -1);
	
	n = node->childs;
	while (n) {
		if (!strcmp (n->name, "value")) {
			name = xmlGetProp (n, "name");
			d(printf ("finding element part %p %s = %p\n", name, name, fe));
			fe = filter_part_find_element (fp, name);
			d(printf ("finding element part %p %s = %p\n", name, name, fe));
			xmlFree (name);
			if (fe) {
				filter_element_xml_decode (fe, n);
			}
		}
		n = n->next;
	}
	
	return 0;
}

FilterPart *
filter_part_clone (FilterPart *fp)
{
	FilterPart *new;
	GList *l;
	FilterElement *fe, *ne;
	
	new = (FilterPart *)gtk_type_new ((GTK_OBJECT (fp))->klass->type);
	new->name = g_strdup(fp->name);
	new->title = g_strdup(fp->title);
	new->code = g_strdup(fp->code);
	l = fp->elements;
	while (l) {
		fe = l->data;
		ne = filter_element_clone (fe);
		new->elements = g_list_append (new->elements, ne);
		l = g_list_next (l);
	}
	
	return new;
}

FilterElement *
filter_part_find_element (FilterPart *ff, const char *name)
{
	GList *l = ff->elements;
	FilterElement *fe;
	
	if (name == NULL)
		return NULL;
	
	while (l) {
		fe = l->data;
		if (fe->name && !strcmp (fe->name, name))
			return fe;
		l = g_list_next (l);
	}
	
	return NULL;
}


GtkWidget *
filter_part_get_widget (FilterPart *ff)
{
	GtkWidget *hbox;
	GList *l = ff->elements;
	FilterElement *fe;
	GtkWidget *w;
	
	hbox = gtk_hbox_new (FALSE, 3);
	
	while (l) {
		fe = l->data;
		w = filter_element_get_widget (fe);
		if (w) {
			gtk_box_pack_start (GTK_BOX (hbox), w, FALSE, FALSE, 3);
		}
		l = g_list_next (l);
	}
	
	gtk_widget_show_all (hbox);
	
	return hbox;
}

/**
 * filter_part_build_code:
 * @ff: 
 * @out: 
 * 
 * Outputs the code of a part.
 **/
void
filter_part_build_code (FilterPart *ff, GString *out)
{
	GList *l = ff->elements;
	FilterElement *fe;
	
	if (ff->code) {
		filter_part_expand_code (ff, ff->code, out);
	}
	while (l) {
		fe = l->data;
		filter_element_build_code (fe, out, ff);
		l = g_list_next (l);
	}	
}

/**
 * filter_part_build_code_list:
 * @l: 
 * @out: 
 * 
 * Construct a list of the filter parts code into
 * a single string.
 **/
void
filter_part_build_code_list (GList *l, GString *out)
{
	FilterPart *fp;
	
	while (l) {
		fp = l->data;
		filter_part_build_code (fp, out);
		g_string_append (out, "\n  ");
		l = g_list_next (l);
	}
}

/**
 * filter_part_find_list:
 * @l: 
 * @name: 
 * 
 * Find a filter part stored in a list.
 * 
 * Return value: 
 **/
FilterPart *
filter_part_find_list (GList *l, const char *name)
{
	FilterPart *part;
	
	d(printf ("Find part named %s\n", name));
	
	while (l) {
		part = l->data;
		if (!strcmp (part->name, name)) {
			d(printf ("Found!\n"));
			return part;
		}
		l = g_list_next (l);
	}
	
	return NULL;
}

/**
 * filter_part_next_list:
 * @l: 
 * @last: The last item retrieved, or NULL to start
 * from the beginning of the list.
 * 
 * Iterate through a filter part list.
 * 
 * Return value: The next value in the list, or NULL if the
 * list is expired.
 **/
FilterPart *
filter_part_next_list (GList *l, FilterPart *last)
{
	GList *node = l;
	
	if (last != NULL) {
		node = g_list_find (node, last);
		if (node == NULL)
			node = l;
		else
			node = g_list_next (node);
	}
	if (node)
		return node->data;
	
	return NULL;
}

/**
 * filter_part_expand_code:
 * @ff: 
 * @str: 
 * @out: 
 * 
 * Expands the variables in string @str based on the values of the part.
 **/
void
filter_part_expand_code (FilterPart *ff, const char *source, GString *out)
{
	const char *newstart, *start, *end;
	char *name = alloca (32);
	int len, namelen = 32;
	FilterElement *fe;
	
	start = source;
	while (start && (newstart = strstr (start, "${"))
		&& (end = strstr (newstart+2, "}")) ) {
		len = end - newstart - 2;
		if (len + 1 > namelen) {
			namelen = (len + 1) * 2;
			name = alloca (namelen);
		}
		memcpy (name, newstart+2, len);
		name[len] = 0;
		fe = filter_part_find_element (ff, name);
		d(printf("expand code: looking up variab le '%s' = %p\n", ff, name, fe));
		if (fe) {
			g_string_sprintfa (out, "%.*s", newstart-start, start);
			filter_element_format_sexp (fe, out);
#if 0
		} else if ( (val = g_hash_table_lookup (ff->globals, name)) ) {
			g_string_sprintfa (out, "%.*s", newstart-start, start);
			e_sexp_encode_string (out, val);
#endif
		} else {
			g_string_sprintfa (out, "%.*s", end-start+1, start);
		}
		start = end + 1;
	}
	g_string_append (out, start);
}

#if 0
int main(int argc, char **argv)
{
	xmlDocPtr system;
	FilterPart *ff;
	GtkWidget *w;
	GnomeDialog *gd;
	xmlNodePtr node;
	GString *code;

	gnome_init("test", "0.0", argc, argv);

	system = xmlParseFile("form.xml");
	if (system==NULL) {
		printf("i/o error\n");
		return 1;
	}

	ff = filter_part_new();
	filter_part_xml_create(ff, system->root);

	w = filter_part_get_widget(ff);

	gd = (GnomeDialog *)gnome_dialog_new(_("Test"), GNOME_STOCK_BUTTON_OK, NULL);
	gtk_window_set_policy(GTK_WINDOW(gd), FALSE, TRUE, FALSE);
	gtk_box_pack_start((GtkBox *)gd->vbox, w, TRUE, TRUE, 0);
	gtk_widget_show((GtkWidget *)gd);

	gnome_dialog_run_and_close(gd);

	code = g_string_new("");
	filter_part_build_code(ff, code);
	printf("code is:\n%s\n", code->str);

	return 0;
}
#endif