/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* 
 * pas-backend-card-sexp.c
 * Copyright 1999, 2000, 2001, Ximian, Inc.
 *
 * 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 "pas-backend-card-sexp.h"

#include <string.h>
#include <e-util/e-sexp.h>
#include <gal/widgets/e-unicode.h>

static GObjectClass *parent_class;

typedef struct _SearchContext SearchContext;

struct _PASBackendCardSExpPrivate {
	ESExp *search_sexp;
	SearchContext *search_context;
};

struct _SearchContext {
	EContact *contact;
};

static gboolean
compare_email (EContact *contact, const char *str,
	       char *(*compare)(const char*, const char*))
{
	int i;

	for (i = E_CONTACT_EMAIL_1; i <= E_CONTACT_EMAIL_3; i ++) {
		const char *email = e_contact_get_const (contact, i);

		if (email && compare(email, str))
			return TRUE;
	}

	return FALSE;
}

static gboolean
compare_phone (EContact *contact, const char *str,
	       char *(*compare)(const char*, const char*))
{
	int i;
	gboolean rv = FALSE;

	for (i = E_CONTACT_FIRST_PHONE_ID; i <= E_CONTACT_LAST_PHONE_ID; i ++) {
		char *phone = e_contact_get (contact, i);

		rv = phone && compare(phone, str);
		g_free (phone);

		if (rv)
			break;
	}

	return rv;
}

static gboolean
compare_name (EContact *contact, const char *str,
	      char *(*compare)(const char*, const char*))
{
	const char *name;

	name = e_contact_get_const (contact, E_CONTACT_FULL_NAME);
	if (name && compare (name, str))
		return TRUE;

	name = e_contact_get_const (contact, E_CONTACT_FAMILY_NAME);
	if (name && compare (name, str))
		return TRUE;

	return FALSE;
}

static gboolean
compare_address (EContact *contact, const char *str,
		 char *(*compare)(const char*, const char*))
{
	g_warning("address searching not implemented\n");
	return FALSE;
}

static gboolean
compare_category (EContact *contact, const char *str,
		  char *(*compare)(const char*, const char*))
{
	GList *categories;
	GList *iterator;
	gboolean ret_val = FALSE;

	categories = e_contact_get (contact, E_CONTACT_CATEGORY_LIST);

	for (iterator = categories; iterator; iterator = iterator->next) {
		const char *category = iterator->data;

		if (compare(category, str)) {
			ret_val = TRUE;
			break;
		}
	}

	g_list_foreach (categories, (GFunc)g_free, NULL);
	g_list_free (categories);

	return ret_val;
}

static struct prop_info {
	EContactField field_id;
	const char *query_prop;
#define PROP_TYPE_NORMAL   0x01
#define PROP_TYPE_LIST     0x02
	int prop_type;
	gboolean (*list_compare)(EContact *contact, const char *str,
				 char *(*compare)(const char*, const char*));

} prop_info_table[] = {
#define NORMAL_PROP(f,q) {f, q, PROP_TYPE_NORMAL, NULL}
#define LIST_PROP(q,c) {0, q, PROP_TYPE_LIST, c}

	/* query prop,   type,              list compare function */
	NORMAL_PROP ( E_CONTACT_FILE_AS, "file_as" ),
	LIST_PROP ( "full_name", compare_name), /* not really a list, but we need to compare both full and surname */
	NORMAL_PROP ( E_CONTACT_HOMEPAGE_URL, "url"),
	NORMAL_PROP ( E_CONTACT_MAILER, "mailer"),
	NORMAL_PROP ( E_CONTACT_ORG, "org"),
	NORMAL_PROP ( E_CONTACT_ORG_UNIT, "org_unit"),
	NORMAL_PROP ( E_CONTACT_OFFICE, "office"),
	NORMAL_PROP ( E_CONTACT_TITLE, "title"),
	NORMAL_PROP ( E_CONTACT_ROLE, "role"),
	NORMAL_PROP ( E_CONTACT_MANAGER, "manager"),
	NORMAL_PROP ( E_CONTACT_ASSISTANT, "assistant"),
	NORMAL_PROP ( E_CONTACT_NICKNAME, "nickname"),
	NORMAL_PROP ( E_CONTACT_SPOUSE, "spouse" ),
	NORMAL_PROP ( E_CONTACT_NOTE, "note"),
	NORMAL_PROP ( E_CONTACT_UID, "id"),
	LIST_PROP ( "email", compare_email ),
	LIST_PROP ( "phone", compare_phone ),
	LIST_PROP ( "address", compare_address ),
	LIST_PROP ( "category", compare_category ),
};
static int num_prop_infos = sizeof(prop_info_table) / sizeof(prop_info_table[0]);

static ESExpResult *
entry_compare(SearchContext *ctx, struct _ESExp *f,
	      int argc, struct _ESExpResult **argv,
	      char *(*compare)(const char*, const char*))
{
	ESExpResult *r;
	int truth = FALSE;

	if (argc == 2
	    && argv[0]->type == ESEXP_RES_STRING
	    && argv[1]->type == ESEXP_RES_STRING) {
		char *propname;
		struct prop_info *info = NULL;
		int i;
		gboolean any_field;

		propname = argv[0]->value.string;

		any_field = !strcmp(propname, "x-evolution-any-field");
		for (i = 0; i < num_prop_infos; i ++) {
			if (any_field
			    || !strcmp (prop_info_table[i].query_prop, propname)) {
				info = &prop_info_table[i];
				
				if (info->prop_type == PROP_TYPE_NORMAL) {
					const char *prop = NULL;
					/* straight string property matches */
					
					prop = e_contact_get_const (ctx->contact, info->field_id);

					if (prop && compare(prop, argv[1]->value.string)) {
						truth = TRUE;
					}
					if ((!prop) && compare("", argv[1]->value.string)) {
						truth = TRUE;
					}
				}
				else if (info->prop_type == PROP_TYPE_LIST) {
					/* the special searches that match any of the list elements */
					truth = info->list_compare (ctx->contact, argv[1]->value.string, compare);
				}

				/* if we're looking at all fields and find a match,
				   or if we're just looking at this one field,
				   break. */
				if ((any_field && truth)
				    || !any_field)
					break;
			}
		}
		
	}
	r = e_sexp_result_new(f, ESEXP_RES_BOOL);
	r->value.bool = truth;

	return r;
}

static ESExpResult *
func_contains(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data)
{
	SearchContext *ctx = data;

	return entry_compare (ctx, f, argc, argv, (char *(*)(const char*, const char*)) e_utf8_strstrcase);
}

static char *
is_helper (const char *s1, const char *s2)
{
	if (!strcasecmp(s1, s2))
		return (char*)s1;
	else
		return NULL;
}

static ESExpResult *
func_is(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data)
{
	SearchContext *ctx = data;

	return entry_compare (ctx, f, argc, argv, is_helper);
}

static char *
endswith_helper (const char *s1, const char *s2)
{
	char *p;
	if ((p = (char*)e_utf8_strstrcase(s1, s2))
	    && (strlen(p) == strlen(s2)))
		return p;
	else
		return NULL;
}

static ESExpResult *
func_endswith(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data)
{
	SearchContext *ctx = data;

	return entry_compare (ctx, f, argc, argv, endswith_helper);
}

static char *
beginswith_helper (const char *s1, const char *s2)
{
	char *p;
	if ((p = (char*)e_utf8_strstrcase(s1, s2))
	    && (p == s1))
		return p;
	else
		return NULL;
}

static ESExpResult *
func_beginswith(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data)
{
	SearchContext *ctx = data;

	return entry_compare (ctx, f, argc, argv, beginswith_helper);
}

static ESExpResult *
func_exists(struct _ESExp *f, int argc, struct _ESExpResult **argv, void *data)
{
	SearchContext *ctx = data;
	ESExpResult *r;
	int truth = FALSE;

	if (argc == 1
	    && argv[0]->type == ESEXP_RES_STRING) {
		char *propname;
		struct prop_info *info = NULL;
		int i;

		propname = argv[0]->value.string;

		for (i = 0; i < num_prop_infos; i ++) {
			if (!strcmp (prop_info_table[i].query_prop, propname)) {
				info = &prop_info_table[i];
				
				if (info->prop_type == PROP_TYPE_NORMAL) {
					const char *prop = NULL;
					/* searches where the query's property
					   maps directly to an ecard property */
					
					prop = e_contact_get_const (ctx->contact, info->field_id);

					if (prop && *prop)
						truth = TRUE;
				}
				else if (info->prop_type == PROP_TYPE_LIST) {
				/* the special searches that match any of the list elements */
					truth = info->list_compare (ctx->contact, "", (char *(*)(const char*, const char*)) e_utf8_strstrcase);
				}

				break;
			}
		}
		
	}
	r = e_sexp_result_new(f, ESEXP_RES_BOOL);
	r->value.bool = truth;

	return r;
}

/* 'builtin' functions */
static struct {
	char *name;
	ESExpFunc *func;
	int type;		/* set to 1 if a function can perform shortcut evaluation, or
				   doesn't execute everything, 0 otherwise */
} symbols[] = {
	{ "contains", func_contains, 0 },
	{ "is", func_is, 0 },
	{ "beginswith", func_beginswith, 0 },
	{ "endswith", func_endswith, 0 },
	{ "exists", func_exists, 0 },
};

gboolean
pas_backend_card_sexp_match_contact (PASBackendCardSExp *sexp, EContact *contact)
{
	ESExpResult *r;
	gboolean retval;

	if (!contact) {
		g_warning ("null EContact passed to pas_backend_card_sexp_match_contact");
		return FALSE;
	}

	sexp->priv->search_context->contact = g_object_ref (contact);

	r = e_sexp_eval(sexp->priv->search_sexp);

	retval = (r && r->type == ESEXP_RES_BOOL && r->value.bool);

	g_object_unref(sexp->priv->search_context->contact);

	e_sexp_result_free(sexp->priv->search_sexp, r);

	return retval;
}

gboolean
pas_backend_card_sexp_match_vcard (PASBackendCardSExp *sexp, const char *vcard)
{
	EContact *contact;
	gboolean retval;

	contact = e_contact_new_from_vcard (vcard);

	retval = pas_backend_card_sexp_match_contact (sexp, contact);

	g_object_unref(contact);

	return retval;
}



/**
 * pas_backend_card_sexp_new:
 */
PASBackendCardSExp *
pas_backend_card_sexp_new (const char *text)
{
	PASBackendCardSExp *sexp = g_object_new (PAS_TYPE_BACKEND_CARD_SEXP, NULL);
	int esexp_error;
	int i;

	sexp->priv->search_sexp = e_sexp_new();

	for(i=0;i<sizeof(symbols)/sizeof(symbols[0]);i++) {
		if (symbols[i].type == 1) {
			e_sexp_add_ifunction(sexp->priv->search_sexp, 0, symbols[i].name,
					     (ESExpIFunc *)symbols[i].func, sexp->priv->search_context);
		}
		else {
			e_sexp_add_function(sexp->priv->search_sexp, 0, symbols[i].name,
					    symbols[i].func, sexp->priv->search_context);
		}
	}

	e_sexp_input_text(sexp->priv->search_sexp, text, strlen(text));
	esexp_error = e_sexp_parse(sexp->priv->search_sexp);

	if (esexp_error == -1) {
		g_object_unref (sexp);
		sexp = NULL;
	}

	return sexp;
}

static void
pas_backend_card_sexp_dispose (GObject *object)
{
	PASBackendCardSExp *sexp = PAS_BACKEND_CARD_SEXP (object);

	if (sexp->priv) {
		e_sexp_unref(sexp->priv->search_sexp);

		g_free (sexp->priv->search_context);
		g_free (sexp->priv);
		sexp->priv = NULL;
	}

	if (G_OBJECT_CLASS (parent_class)->dispose)
		G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
pas_backend_card_sexp_class_init (PASBackendCardSExpClass *klass)
{
	GObjectClass  *object_class = G_OBJECT_CLASS (klass);

	parent_class = g_type_class_peek_parent (klass);

	/* Set the virtual methods. */

	object_class->dispose = pas_backend_card_sexp_dispose;
}

static void
pas_backend_card_sexp_init (PASBackendCardSExp *sexp)
{
	PASBackendCardSExpPrivate *priv;

	priv             = g_new0 (PASBackendCardSExpPrivate, 1);

	sexp->priv = priv;
	priv->search_context = g_new (SearchContext, 1);
}

/**
 * pas_backend_card_sexp_get_type:
 */
GType
pas_backend_card_sexp_get_type (void)
{
	static GType type = 0;

	if (! type) {
		GTypeInfo info = {
			sizeof (PASBackendCardSExpClass),
			NULL, /* base_class_init */
			NULL, /* base_class_finalize */
			(GClassInitFunc)  pas_backend_card_sexp_class_init,
			NULL, /* class_finalize */
			NULL, /* class_data */
			sizeof (PASBackendCardSExp),
			0,    /* n_preallocs */
			(GInstanceInitFunc) pas_backend_card_sexp_init
		};

		type = g_type_register_static (G_TYPE_OBJECT, "PASBackendCardSExp", &info, 0);
	}

	return type;
}