path: root/addressbook/backend/ebook/e-card-compare.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */

/*
 * e-card-compare.c
 *
 * Copyright (C) 2001 Ximian, Inc.
 *
 * Developed by Jon Trowbridge <trow@ximian.com>
 */

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 */

#include <config.h>
#include <ctype.h>
#include <gal/unicode/gunicode.h>
#include "e-book-util.h"
#include "e-card-compare.h"

/* This is an "optimistic" combiner: the best of the two outcomes is
   selected. */
static ECardMatchType
combine_comparisons (ECardMatchType prev,
             ECardMatchType new_info)
{
    if (new_info == E_CARD_MATCH_NOT_APPLICABLE)
        return prev;
    return (ECardMatchType) MAX ((gint) prev, (gint) new_info);
}


/*** Name comparisons ***/

/* This *so* doesn't belong here... at least not implemented in a
   sucky way like this.  But by getting it in here now, I can fix it
   up w/o adding a new feature when we are in feature freeze. :-) */

/* This is very Anglocentric. */
static gchar *name_synonyms[][2] = {
    { "jon", "john" },   /* Ah, the hacker's perogative */
    { "joseph", "joe" },
    { "robert", "bob" },
    { "richard", "dick" },
    { "william", "bill" },
    { "anthony", "tony" },
    { "michael", "mike" },
    { "eric", "erik" },
    { "elizabeth", "liz" },
    { "jeff", "geoff" },
    { "jeff", "geoffrey" },
    { "jim", "james" },
    { "abigal", "abby" },
    { "amanda", "amy" },
    { "amanda", "manda" },
    { "jennifer", "jenny" },
    { "rebecca", "becca" },
    { "rebecca", "becky" },
    { "anderson", "andersen" },
    /* We could go on and on... */
    { NULL, NULL }
};
    
static gboolean
name_fragment_match (const gchar *a, const gchar *b)
{
    gint i, len_a, len_b;

    /* This will cause "Chris" and "Christopher" to match. */
    len_a = g_utf8_strlen (a, -1);
    len_b = g_utf8_strlen (b, -1);
    if (!g_utf8_strncasecmp (a, b, MIN (len_a, len_b)))
        return TRUE;

    /* Check for nicknames.  Yes, the linear search blows. */
    for (i=0; name_synonyms[i][0]; ++i) {

        if (!g_utf8_strcasecmp (name_synonyms[i][0], a)
            && !g_utf8_strcasecmp (name_synonyms[i][1], b))
            return TRUE;
        
        if (!g_utf8_strcasecmp (name_synonyms[i][0], b)
            && !g_utf8_strcasecmp (name_synonyms[i][1], a))
            return TRUE;
    }

    return FALSE;
}

ECardMatchType
e_card_compare_name (ECard *card1, ECard *card2)
{
    ECardName *a, *b;
    gint matches=0, possible=0;
    gboolean given_match = FALSE, additional_match = FALSE, family_match = FALSE;

    g_return_val_if_fail (card1 && E_IS_CARD (card1), E_CARD_MATCH_NOT_APPLICABLE);
    g_return_val_if_fail (card2 && E_IS_CARD (card2), E_CARD_MATCH_NOT_APPLICABLE);

    a = card1->name;
    b = card2->name;

    if (a == NULL || b == NULL)
        return E_CARD_MATCH_NOT_APPLICABLE;

    if (a->given && b->given) {
        ++possible;
        if (name_fragment_match (a->given, b->given)) {
            ++matches;
            given_match = TRUE;
        }
    }

    if (a->additional && b->additional) {
        ++possible;
        if (name_fragment_match (a->additional, b->additional)) {
            ++matches;
            additional_match = TRUE;
        }
    }

    if (a->family && b->family) {
        ++possible;
        if (name_fragment_match (a->family, b->family)) {
            ++matches;
            family_match = TRUE;
        }
    }

    /* Now look at the # of matches and try to intelligently map
       an E_CARD_MATCH_* type to it.  Special consideration is given
       to family-name matches. */

    if (possible == 0)
        return E_CARD_MATCH_NOT_APPLICABLE;

    if (possible == 1)
        return family_match ? E_CARD_MATCH_VAGUE : E_CARD_MATCH_NONE;

    if (possible == matches)
        return family_match ? E_CARD_MATCH_EXACT : E_CARD_MATCH_PARTIAL;

    if (possible == matches+1)
        return family_match ? E_CARD_MATCH_PARTIAL : E_CARD_MATCH_VAGUE;

    return E_CARD_MATCH_NONE;
}


/*** Nickname Comparisons ***/

ECardMatchType
e_card_compare_nickname (ECard *card1, ECard *card2)
{
    g_return_val_if_fail (card1 && E_IS_CARD (card1), E_CARD_MATCH_NOT_APPLICABLE);
    g_return_val_if_fail (card2 && E_IS_CARD (card2), E_CARD_MATCH_NOT_APPLICABLE);

    return E_CARD_MATCH_NOT_APPLICABLE;
}



/*** E-mail Comparisons ***/

static gboolean
match_email_username (const gchar *addr1, const gchar *addr2)
{
    gint c1, c2;
    if (addr1 == NULL || addr2 == NULL)
        return FALSE;

    while (*addr1 && *addr2 && *addr1 != '@' && *addr2 != '@') {
        c1 = isupper (*addr1) ? tolower (*addr1) : *addr1;
        c2 = isupper (*addr2) ? tolower (*addr2) : *addr2;
        if (c1 != c2)
            return FALSE;
        ++addr1;
        ++addr2;
    }

    return *addr1 == *addr2;
}

static gboolean
match_email_hostname (const gchar *addr1, const gchar *addr2)
{
    gint c1, c2;
    gboolean seen_at1, seen_at2;
    if (addr1 == NULL || addr2 == NULL)
        return FALSE;

    /* Walk to the end of each string. */
    seen_at1 = FALSE;
    if (*addr1) {
        while (*addr1) {
            if (*addr1 == '@')
                seen_at1 = TRUE;
            ++addr1;
        }
        --addr1;
    }

    seen_at2 = FALSE;
    if (*addr2) {
        while (*addr2) {
            if (*addr2 == '@')
                seen_at2 = TRUE;
            ++addr2;
        }
        --addr2;
    }

    if (!seen_at1 && !seen_at2)
        return TRUE;
    if (!seen_at1 || !seen_at2)
        return FALSE;

    while (*addr1 != '@' && *addr2 != '@') {
        c1 = isupper (*addr1) ? tolower (*addr1) : *addr1;
        c2 = isupper (*addr2) ? tolower (*addr2) : *addr2;
        if (c1 != c2)
            return FALSE;
        --addr1;
        --addr2;
    }

    /* This will match bob@foo.ximian.com and bob@ximian.com */
    return *addr1 == '.' || *addr2 == '.';
}

static ECardMatchType
compare_email_addresses (const gchar *addr1, const gchar *addr2)
{
    if (addr1 == NULL || addr2 == NULL)
        return E_CARD_MATCH_NOT_APPLICABLE;

    if (match_email_username (addr1, addr2)) 
        return match_email_hostname (addr1, addr2) ? E_CARD_MATCH_EXACT : E_CARD_MATCH_PARTIAL;

    return E_CARD_MATCH_NONE;
}

ECardMatchType
e_card_compare_email (ECard *card1, ECard *card2)
{
    EIterator *i1, *i2;
    ECardMatchType match = E_CARD_MATCH_NOT_APPLICABLE;

    g_return_val_if_fail (card1 && E_IS_CARD (card1), E_CARD_MATCH_NOT_APPLICABLE);
    g_return_val_if_fail (card2 && E_IS_CARD (card2), E_CARD_MATCH_NOT_APPLICABLE);

    if (card1->email == NULL || card2->email == NULL)
        return E_CARD_MATCH_NOT_APPLICABLE;

    i1 = e_list_get_iterator (card1->email);
    i2 = e_list_get_iterator (card2->email);

    /* Do pairwise-comparisons on all of the e-mail addresses.  If
       we find an exact match, there is no reason to keep
       checking. */
    e_iterator_reset (i1);
    while (e_iterator_is_valid (i1) && match != E_CARD_MATCH_EXACT) {
        const gchar *addr1 = (const gchar *) e_iterator_get (i1);

        e_iterator_reset (i2);
        while (e_iterator_is_valid (i2) && match != E_CARD_MATCH_EXACT) {
            const gchar *addr2 = (const gchar *) e_iterator_get (i2);

            match = combine_comparisons (match, compare_email_addresses (addr1, addr2));
            
            e_iterator_next (i2);
        }

        e_iterator_next (i1);
    }

    gtk_object_unref (GTK_OBJECT (i1));
    gtk_object_unref (GTK_OBJECT (i2));

    return match;
}

ECardMatchType
e_card_compare_address (ECard *card1, ECard *card2)
{
    g_return_val_if_fail (card1 && E_IS_CARD (card1), E_CARD_MATCH_NOT_APPLICABLE);
    g_return_val_if_fail (card2 && E_IS_CARD (card2), E_CARD_MATCH_NOT_APPLICABLE);

    /* Unimplemented */

    return E_CARD_MATCH_NOT_APPLICABLE;
}

ECardMatchType
e_card_compare_telephone (ECard *card1, ECard *card2)
{
    g_return_val_if_fail (card1 && E_IS_CARD (card1), E_CARD_MATCH_NOT_APPLICABLE);
    g_return_val_if_fail (card2 && E_IS_CARD (card2), E_CARD_MATCH_NOT_APPLICABLE);

    /* Unimplemented */

    return E_CARD_MATCH_NOT_APPLICABLE;
}

ECardMatchType
e_card_compare (ECard *card1, ECard *card2)
{
    ECardMatchType result;

    g_return_val_if_fail (card1 && E_IS_CARD (card1), E_CARD_MATCH_NOT_APPLICABLE);
    g_return_val_if_fail (card2 && E_IS_CARD (card2), E_CARD_MATCH_NOT_APPLICABLE);

    result = E_CARD_MATCH_NONE;
    result = combine_comparisons (result, e_card_compare_name      (card1, card2));
    result = combine_comparisons (result, e_card_compare_nickname  (card1, card2));
    result = combine_comparisons (result, e_card_compare_email     (card1, card2));
    result = combine_comparisons (result, e_card_compare_address   (card1, card2));
    result = combine_comparisons (result, e_card_compare_telephone (card1, card2));

    return result;
}

typedef struct _MatchSearchInfo MatchSearchInfo;
struct _MatchSearchInfo {
    ECard *card;
    GList *avoid;
    ECardMatchQueryCallback cb;
    gpointer closure;
};

static void
match_search_info_free (MatchSearchInfo *info)
{
    if (info) {
        gtk_object_unref (GTK_OBJECT (info->card));

        /* This should already have been deallocated, but just in case... */
        if (info->avoid) {
            g_list_foreach (info->avoid, (GFunc) gtk_object_unref, NULL);
            g_list_free (info->avoid);
            info->avoid = NULL;
        }

        g_free (info);
    }
}

static void
simple_query_cb (EBook *book, EBookSimpleQueryStatus status, const GList *cards, gpointer closure)
{
    MatchSearchInfo *info = (MatchSearchInfo *) closure;
    ECardMatchType best_match = E_CARD_MATCH_NONE;
    ECard *best_card = NULL;
    GList *remaining_cards = NULL;
    const GList *i;

    if (status != E_BOOK_SIMPLE_QUERY_STATUS_SUCCESS) {
        info->cb (info->card, NULL, E_CARD_MATCH_NONE, info->closure);
        match_search_info_free (info);
        return;
    }

    /* remove the cards we're to avoid from the list, if they're present */
    for (i = cards; i != NULL; i = g_list_next (i)) {
        ECard *this_card = E_CARD (i->data);
        GList *iterator;
        gboolean avoid = FALSE;
        for (iterator = info->avoid; iterator; iterator = iterator->next) {
            if (!strcmp (e_card_get_id (iterator->data), e_card_get_id (this_card))) {
                avoid = TRUE;
                break;
            }
        }
        if (!avoid)
            remaining_cards = g_list_prepend (remaining_cards, this_card);
    }

    remaining_cards = g_list_reverse (remaining_cards);

    for (i = remaining_cards; i != NULL; i = g_list_next (i)) {
        ECard *this_card = E_CARD (i->data);
        ECardMatchType this_match = e_card_compare (info->card, this_card);
        if ((gint)this_match > (gint)best_match) {
            best_match = this_match;
            best_card  = this_card;
        }
    }

    g_list_free (remaining_cards);

    info->cb (info->card, best_card, best_match, info->closure);
    match_search_info_free (info);
}

#define MAX_QUERY_PARTS 10
static void
use_common_book_cb (EBook *book, gpointer closure)
{
    MatchSearchInfo *info = (MatchSearchInfo *) closure;
    ECard *card = info->card;
    gchar *query_parts[MAX_QUERY_PARTS];
    gint p=0;
    gchar *query, *qj;
    int i;

    if (book == NULL) {
        info->cb (info->card, NULL, E_CARD_MATCH_NONE, info->closure);
        match_search_info_free (info);
        return;
    }

    if (card->nickname)
        query_parts[p++] = g_strdup_printf ("(beginswith \"nickname\" \"%s\")", card->nickname);


    if (card->name->given && strlen (card->name->given) > 1)
        query_parts[p++] = g_strdup_printf ("(contains \"full_name\" \"%s\")", card->name->given);

    if (card->name->additional && strlen (card->name->additional) > 1)
        query_parts[p++] = g_strdup_printf ("(contains \"full_name\" \"%s\")", card->name->additional);

    if (card->name->family && strlen (card->name->family) > 1)
        query_parts[p++] = g_strdup_printf ("(contains \"full_name\" \"%s\")", card->name->family);

        
    if (card->email) {
        EIterator *iter = e_list_get_iterator (card->email);
        while (e_iterator_is_valid (iter) && p < MAX_QUERY_PARTS) {
            gchar *addr = g_strdup (e_iterator_get (iter));
            if (addr) {
                gchar *s = addr;
                while (*s) {
                    if (*s == '@') {
                        *s = '\0';
                        break;
                    }
                    ++s;
                }
                query_parts[p++] = g_strdup_printf ("(beginswith \"email\" \"%s\")", addr);
                g_free (addr);
            }
            e_iterator_next (iter);
        }
    }

    
    
    /* Build up our full query from the parts. */
    query_parts[p] = NULL;
    qj = g_strjoinv (" ", query_parts);
    for(i = 0; query_parts[i] != NULL; i++)
        g_free(query_parts[i]);
    if (p > 0) {
        query = g_strdup_printf ("(or %s)", qj);
        g_free (qj);
    } else {
        query = qj;
    }

    e_book_simple_query (book, query, simple_query_cb, info);

    g_free (query);
}

void
e_card_locate_match (ECard *card, ECardMatchQueryCallback cb, gpointer closure)
{
    MatchSearchInfo *info;

    g_return_if_fail (card && E_IS_CARD (card));
    g_return_if_fail (cb != NULL);

    info = g_new (MatchSearchInfo, 1);
    info->card = card;
    gtk_object_ref (GTK_OBJECT (card));
    info->cb = cb;
    info->closure = closure;
    info->avoid = NULL;

    e_book_use_local_address_book (use_common_book_cb, info);
}

/**
 * e_card_locate_match_full:
 * @book: The book to look in.  If this is NULL, use the main local
 * addressbook.
 * @card: The card to compare to.
 * @avoid: A list of cards to not match.  These will not show up in the search.
 * @cb: The function to call.
 * @closure: The closure to add to the call.
 * 
 * Look for the best match and return it using the ECardMatchQueryCallback.
 **/
void
e_card_locate_match_full (EBook *book, ECard *card, GList *avoid, ECardMatchQueryCallback cb, gpointer closure)
{
    MatchSearchInfo *info;

    g_return_if_fail (card && E_IS_CARD (card));
    g_return_if_fail (cb != NULL);

    info = g_new (MatchSearchInfo, 1);
    info->card = card;
    gtk_object_ref (GTK_OBJECT (card));
    info->cb = cb;
    info->closure = closure;
    info->avoid = g_list_copy (avoid);
    g_list_foreach (info->avoid, (GFunc) gtk_object_ref, NULL);

    if (book)
        use_common_book_cb (book, info);
    else
        e_book_use_local_address_book (use_common_book_cb, info);
}