import-backend.c

/********************************************************************\
 * 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, contact:                        *
 *                                                                  *
 * Free Software Foundation           Voice:  +1-617-542-5942       *
 * 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652       *
 * Boston, MA  02110-1301,  USA       gnu@gnu.org                   *
\********************************************************************/
#include "config.h"

#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <stdlib.h>
#include <math.h>

#include <errno.h>

#include "gnc-gconf-utils.h"
#include "import-backend.h"
#include "import-utilities.h"
#include "Account.h"
#include "Query.h"
#include "gnc-engine.h"
#include "gnc-ui-util.h"

#define GCONF_SECTION "dialogs/import/generic_matcher"
#define BAYES_OPTION  "use_bayes"

/********************************************************************\
 *   Constants                                                      *
\********************************************************************/

static QofLogModule log_module = GNC_MOD_IMPORT;

/********************************************************************\
 *   Constants, should ideally be defined a user preference dialog  *
\********************************************************************/

static const int MATCH_DATE_THRESHOLD = 4; /*within 4 days*/
static const int MATCH_DATE_NOT_THRESHOLD = 14;

/********************************************************************\
 *   Forward declared prototypes                                    *
\********************************************************************/

static void
matchmap_store_destination (GncImportMatchMap *matchmap,
                            GNCImportTransInfo *trans_info,
                            gboolean use_match);


/********************************************************************\
 *               Structures passed between the functions            *
\********************************************************************/

struct _transactioninfo
{
    Transaction * trans;
    Split * first_split;

    /* GList of GNCImportMatchInfo's, one for each possible duplicate match. */
    GList * match_list;
    GNCImportMatchInfo * selected_match_info;
    gboolean match_selected_manually;

    GNCImportAction action;
    GNCImportAction previous_action;

    /* A list of tokenized strings to use for bayesian matching purposes */
    GList * match_tokens;

    /* In case of a single destination account it is stored here. */
    Account *dest_acc;
    gboolean dest_acc_selected_manually;

    /* Reference id to link gnc transaction to external object. E.g. aqbanking job id. */
    guint32 ref_id;
};

struct _matchinfo
{
    Transaction * trans;
    Split * split;
    /*GNC_match_probability probability;*/
    gint probability;
    gboolean update_proposed;
};

/* Some simple getters and setters for the above data types. */

GList *
gnc_import_TransInfo_get_match_list (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->match_list;
}

Transaction *
gnc_import_TransInfo_get_trans (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->trans;
}

gboolean
gnc_import_TransInfo_is_balanced (const GNCImportTransInfo *info)
{
    g_assert (info);
    /* Assume that the importer won't create a transaction that involves two or more
       currencies and no non-currency commodity.  In that case can use the simpler
       value imbalance check. */
    if (gnc_numeric_zero_p(xaccTransGetImbalanceValue(gnc_import_TransInfo_get_trans(info))))
    {
        return TRUE;
    }
    else
    {
        return FALSE;
    }
}

Split *
gnc_import_TransInfo_get_fsplit (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->first_split;
}

GNCImportMatchInfo *
gnc_import_TransInfo_get_selected_match (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->selected_match_info;
}

void
gnc_import_TransInfo_set_selected_match (GNCImportTransInfo *info,
        GNCImportMatchInfo *match,
        gboolean selected_manually)
{
    g_assert (info);
    info->selected_match_info = match;
    info->match_selected_manually = selected_manually;
}

gboolean
gnc_import_TransInfo_get_match_selected_manually (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->match_selected_manually;
}

GNCImportAction
gnc_import_TransInfo_get_action (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->action;
}

void
gnc_import_TransInfo_set_action (GNCImportTransInfo *info,
                                 GNCImportAction action)
{
    g_assert (info);
    if (action != info->action)
    {
        info->previous_action = info->action;
        info->action = action;
    }
}

Account *
gnc_import_TransInfo_get_destacc (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->dest_acc;
}
void gnc_import_TransInfo_set_destacc (GNCImportTransInfo *info,
                                       Account *acc,
                                       gboolean selected_manually)
{
    g_assert (info);
    info->dest_acc = acc;
    info->dest_acc_selected_manually = selected_manually;

    /* Store the mapping to the other account in the MatchMap. */
    if (selected_manually)
    {
        matchmap_store_destination (NULL, info, FALSE);
    }
}

gboolean
gnc_import_TransInfo_get_destacc_selected_manually (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->dest_acc_selected_manually;
}

guint32
gnc_import_TransInfo_get_ref_id (const GNCImportTransInfo *info)
{
    g_assert (info);
    return info->ref_id;
}

void
gnc_import_TransInfo_set_ref_id (GNCImportTransInfo *info,
                                 guint32 ref_id)
{
    g_assert (info);
    info->ref_id = ref_id;
}


Split *
gnc_import_MatchInfo_get_split (const GNCImportMatchInfo * info)
{
    g_assert (info);
    return info->split;
}

gint
gnc_import_MatchInfo_get_probability (const GNCImportMatchInfo * info)
{
    if (info)
    {
        return info->probability;
    }
    else
    {
        return 0;
    }
}

void gnc_import_TransInfo_delete (GNCImportTransInfo *info)
{
    if (info)
    {
        g_list_free (info->match_list);
        /*If the transaction exists and is still open, it must be destroyed*/
        if (info->trans && xaccTransIsOpen(info->trans))
        {
            xaccTransDestroy(info->trans);
            xaccTransCommitEdit(info->trans);
        }
        if (info->match_tokens)
        {
            GList *node;

            for (node = info->match_tokens; node; node = node->next)
                g_free (node->data);

            g_list_free (info->match_tokens);
        }
        g_free(info);
    }
}

GdkPixbuf* gen_probability_pixbuf(gint score_original, GNCImportSettings *settings, GtkWidget * widget)
{
    GdkPixbuf* retval = NULL;
    gint i, j;
    gint score;
    const gint height = 15;
    const gint width_each_bar = 7;
    gchar * green_bar = ("bggggb ");
    gchar * yellow_bar = ("byyyyb ");
    gchar * red_bar = ("brrrrb ");
    gchar * black_bar = ("bbbbbb ");
    const gint width_first_bar = 1;
    gchar * black_first_bar = ("b");
    const gint num_colors = 5;
    gchar * size_str;
    gchar * none_color_str = g_strdup_printf("  c None");
    gchar * green_color_str = g_strdup_printf("g c green");
    gchar * yellow_color_str = g_strdup_printf("y c yellow");
    gchar * red_color_str = g_strdup_printf("r c red");
    gchar * black_color_str = g_strdup_printf("b c black");
    gchar * xpm[2+num_colors+height];
    gint add_threshold, clear_threshold;

    g_assert(settings);
    g_assert(widget);
    if (score_original < 0)
    {
        score = 0;
    }
    else
    {
        score = score_original;
    }
    size_str = g_strdup_printf("%d%s%d%s%d%s", (width_each_bar * score) + width_first_bar/*width*/, " ", height, " ", num_colors, " 1"/*characters per pixel*/);

    /*DEBUG("Begin");*/
    xpm[0] = size_str;
    xpm[1] = none_color_str;
    xpm[2] = green_color_str;
    xpm[3] = yellow_color_str;
    xpm[4] = red_color_str;
    xpm[5] = black_color_str;
    add_threshold = gnc_import_Settings_get_add_threshold(settings);
    clear_threshold = gnc_import_Settings_get_clear_threshold(settings);

    for (i = 0; i < height; i++)
    {
        xpm[num_colors+1+i] = g_new0(char, (width_each_bar * score) + width_first_bar + 1);
        for (j = 0; j <= score; j++)
        {
            if (i == 0 || i == height - 1)
            {
                if (j == 0)
                {
                    strcat(xpm[num_colors+1+i], black_first_bar);
                }
                else
                {
                    strcat(xpm[num_colors+1+i], black_bar);
                }
            }
            else
            {
                if (j == 0)
                {
                    strcat(xpm[num_colors+1+i], black_first_bar);
                }
                else if (j <= add_threshold)
                {
                    strcat(xpm[num_colors+1+i], red_bar);
                }
                else if (j >= clear_threshold)
                {
                    strcat(xpm[num_colors+1+i], green_bar);
                }
                else
                {
                    strcat(xpm[num_colors+1+i], yellow_bar);
                }
            }
        }
    }

    retval =  gdk_pixbuf_new_from_xpm_data((const gchar **)xpm);
    for (i = 0; i <= num_colors + height; i++)
    {
        /*DEBUG("free_loop i=%d%s%s",i,": ",xpm[i]);*/
        g_free(xpm[i]);
    }

    return retval;
}

/*************************************************************************
 * MatchMap- related functions (storing and retrieving)
 */

/* Tokenize a string and append to an existing GList(or an empty GList)
 * the tokens
 */
static GList*
tokenize_string(GList* existing_tokens, const char *string)
{
    char **tokenized_strings; /* array of strings returned by g_strsplit() */
    char **stringpos;

    tokenized_strings = g_strsplit(string, " ", 0);
    stringpos = tokenized_strings;

    /* add each token to the token GList */
    while (stringpos && *stringpos)
    {
        /* prepend the char* to the token GList */
        existing_tokens = g_list_prepend(existing_tokens, g_strdup(*stringpos));

        /* then move to the next string */
        stringpos++;
    }

    /* free up the strings that g_strsplit() created */
    g_strfreev(tokenized_strings);

    return existing_tokens;
}

/* create and return a list of tokens for a given transaction info. */
static GList*
TransactionGetTokens(GNCImportTransInfo *info)
{
    Transaction* transaction;
    GList* tokens;
    const char* text;
    time_t transtime;
    struct tm *tm_struct;
    char local_day_of_week[16];
    Split* split;
    int split_index;

    g_return_val_if_fail (info, NULL);
    if (info->match_tokens) return info->match_tokens;

    transaction = gnc_import_TransInfo_get_trans(info);
    g_assert(transaction);

    tokens = 0; /* start off with an empty list */

    /* make tokens from the transaction description */
    text = xaccTransGetDescription(transaction);
    tokens = tokenize_string(tokens, text);

    /* The day of week the transaction occured is a good indicator of
     * what account this transaction belongs in.  Get the date and covert
     * it to day of week as a token
     */
    transtime = xaccTransGetDate(transaction);
    tm_struct = gmtime(&transtime);
    if (!qof_strftime(local_day_of_week, sizeof(local_day_of_week), "%A", tm_struct))
    {
        PERR("TransactionGetTokens: error, strftime failed\n");
    }

    /* we cannot add a locally allocated string to this array, dup it so
     * it frees the same way the rest do
     */
    tokens = g_list_prepend(tokens, g_strdup(local_day_of_week));

    /* make tokens from the memo of each split of this transaction */
    split_index = 0;
    while ((split = xaccTransGetSplit(transaction, split_index)))
    {
        text = xaccSplitGetMemo(split);
        tokens = tokenize_string(tokens, text);
        split_index++; /* next split */
    }

    /* remember the list of tokens for later.. */
    info->match_tokens = tokens;

    /* return the pointer to the GList */
    return tokens;
}

/* searches using the GNCImportTransInfo through all existing transactions
 * if there is an exact match of the description and memo
 */
static Account *
matchmap_find_destination (GncImportMatchMap *matchmap, GNCImportTransInfo *info)
{
    GncImportMatchMap *tmp_map;
    Account *result;
    GList* tokens;
    gboolean useBayes;

    g_assert (info);
    tmp_map = ((matchmap != NULL) ? matchmap :
               gnc_imap_create_from_account
               (xaccSplitGetAccount
                (gnc_import_TransInfo_get_fsplit (info))));

    useBayes = gnc_gconf_get_bool(GCONF_SECTION, BAYES_OPTION, NULL);
    if (useBayes)
    {
        /* get the tokens for this transaction* */
        tokens = TransactionGetTokens(info);

        /* try to find the destination account for this transaction from its tokens */
        result = gnc_imap_find_account_bayes(tmp_map, tokens);

    }
    else
    {
        /* old system of transaction to account matching */
        result = gnc_imap_find_account
                 (tmp_map, GNCIMPORT_DESC,
                  xaccTransGetDescription (gnc_import_TransInfo_get_trans (info)));
    }

    /* Disable matching by memo, until bayesian filtering is implemented.
     * It's currently unlikely to help, and has adverse effects,
     * causing false positives, since very often the type of the
     * transaction is stored there.

       if (result == NULL)
       result = gnc_imap_find_account
       (tmp_map, GNCIMPORT_MEMO,
       xaccSplitGetMemo (gnc_import_TransInfo_get_fsplit (info)));
    */

    if (matchmap == NULL)
        gnc_imap_destroy (tmp_map);

    return result;
}

static void
matchmap_store_destination (GncImportMatchMap *matchmap,
                            GNCImportTransInfo *trans_info,
                            gboolean use_match)
{
    GncImportMatchMap *tmp_matchmap = NULL;
    Account *dest;
    const char *descr, *memo;
    GList *tokens;
    gboolean useBayes;

    g_assert (trans_info);

    /* This will store the destination account of the selected match if
       the reconcile match selected has only two splits.  Good idea
       Christian! */
    dest = ((use_match) ?
            xaccSplitGetAccount
            (xaccSplitGetOtherSplit
             (gnc_import_MatchInfo_get_split
              (gnc_import_TransInfo_get_selected_match (trans_info)))) :
            gnc_import_TransInfo_get_destacc (trans_info));
    if (dest == NULL)
        return;

    tmp_matchmap = ((matchmap != NULL) ?
                    matchmap :
                    gnc_imap_create_from_account
                    (xaccSplitGetAccount
                     (gnc_import_TransInfo_get_fsplit (trans_info))));

    /* see what matching system we are currently using */
    useBayes = gnc_gconf_get_bool(GCONF_SECTION, BAYES_OPTION, NULL);
    if (useBayes)
    {
        /* tokenize this transaction */
        tokens = TransactionGetTokens(trans_info);

        /* add the tokens to the imap with the given destination account */
        gnc_imap_add_account_bayes(tmp_matchmap, tokens, dest);

    }
    else
    {
        /* old matching system */
        descr = xaccTransGetDescription
                (gnc_import_TransInfo_get_trans (trans_info));
        if (descr && (strlen (descr) > 0))
            gnc_imap_add_account (tmp_matchmap,
                                  GNCIMPORT_DESC,
                                  descr,
                                  dest);
        memo = xaccSplitGetMemo
               (gnc_import_TransInfo_get_fsplit (trans_info));
        if (memo && (strlen (memo) > 0))
            gnc_imap_add_account (tmp_matchmap,
                                  GNCIMPORT_MEMO,
                                  memo,
                                  dest);
    } /* if(useBayes) */

    if (matchmap == NULL)
        gnc_imap_destroy (tmp_matchmap);
}



static void split_find_match (GNCImportTransInfo * trans_info,
                              Split * split,
                              gint display_threshold,
                              double fuzzy_amount_difference)
{
    /* DEBUG("Begin"); */

    /*Ignore the split if the transaction is open for edit, meaning it
      was just downloaded. */
    if (xaccTransIsOpen(xaccSplitGetParent(split)) == FALSE)
    {
        GNCImportMatchInfo * match_info;
        gint prob = 0;
        gboolean update_proposed;
        double downloaded_split_amount, match_split_amount;
        time_t match_time, download_time;
        int datediff_day;
        Transaction *new_trans = gnc_import_TransInfo_get_trans (trans_info);
        Split *new_trans_fsplit = gnc_import_TransInfo_get_fsplit (trans_info);

        /* Matching heuristics */

        /* Amount heuristics */
        downloaded_split_amount =
            gnc_numeric_to_double (xaccSplitGetAmount(new_trans_fsplit));
        /*DEBUG(" downloaded_split_amount=%f", downloaded_split_amount);*/
        match_split_amount = gnc_numeric_to_double(xaccSplitGetAmount(split));
        /*DEBUG(" match_split_amount=%f", match_split_amount);*/
        if (fabs(downloaded_split_amount - match_split_amount) < 1e-6)
            /* bug#347791: Double type shouldn't be compared for exact
               equality, so we're using fabs() instead. */
            /*if (gnc_numeric_equal(xaccSplitGetAmount
              (new_trans_fsplit),
              xaccSplitGetAmount(split)))
              -- gnc_numeric_equal is an expensive function call */
        {
            prob = prob + 3;
            /*DEBUG("heuristics:  probability + 3 (amount)");*/
        }
        else if (fabs (downloaded_split_amount - match_split_amount) <=
                 fuzzy_amount_difference)
        {
            /* ATM fees are sometimes added directly in the transaction.
               So you withdraw 100$ and get charged 101,25$ in the same
               transaction */
            prob = prob + 2;
            /*DEBUG("heuristics:  probability + 2 (amount)");*/
        }
        else
        {
            /* If a transaction's amount doesn't match within the
               threshold, it's very unlikely to be the same transaction
               so we give it an extra -5 penality */
            prob = prob - 5;
            /* DEBUG("heuristics:  probability - 1 (amount)"); */
        }

        /* Date heuristics */
        match_time = xaccTransGetDate (xaccSplitGetParent (split));
        download_time = xaccTransGetDate (new_trans);
        datediff_day = abs(match_time - download_time) / 86400;
        /* Sorry, there are not really functions around at all that
                 provide for less hacky calculation of days of date
                 differences. Whatever. On the other hand, the difference
                 calculation itself will work regardless of month/year
                 turnarounds. */
        /*DEBUG("diff day %d", datediff_day);*/
        if (datediff_day == 0)
        {
            prob = prob + 3;
            /*DEBUG("heuristics:  probability + 3 (date)");*/
        }
        else if (datediff_day <= MATCH_DATE_THRESHOLD)
        {
            prob = prob + 2;
            /*DEBUG("heuristics:  probability + 2 (date)");*/
        }
        else if (datediff_day > MATCH_DATE_NOT_THRESHOLD)
        {
            /* Extra penalty if that split lies awfully far away from
               the given one. */
            prob = prob - 5;
            /*DEBUG("heuristics:  probability - 5 (date)"); */
            /* Changed 2005-02-21: Revert the hard-limiting behaviour
               back to the previous large penalty. (Changed 2004-11-27:
               The penalty is so high that we can forget about this
               split anyway and skip the rest of the tests.) */
        }

        /* Check if date and amount are identical */
        update_proposed = (prob < 6);

        /* Check number heuristics */
        {
            const char *new_trans_str = xaccTransGetNum(new_trans);
            if (new_trans_str && strlen(new_trans_str) != 0)
            {
                long new_trans_number, split_number;
                const gchar *split_str;
                char *endptr;
                gboolean conversion_ok = TRUE;

                /* To distinguish success/failure after strtol call */
                errno = 0;
                new_trans_number = strtol(new_trans_str, &endptr, 10);
                /* Possible addressed problems: over/underflow, only non
                             numbers on string and string empty */
                if (errno || endptr == new_trans_str)
                    conversion_ok = FALSE;

                split_str = xaccTransGetNum (xaccSplitGetParent (split));
                errno = 0;
                split_number = strtol(split_str, &endptr, 10);
                if (errno || endptr == split_str)
                    conversion_ok = FALSE;

                if ( (conversion_ok && (split_number == new_trans_number)) ||
                        (safe_strcmp(new_trans_str, split_str) == 0) )
                {
                    /* An exact match of the Check number gives a +4 */
                    prob += 4;
                    /*DEBUG("heuristics:  probability + 4 (Check number)");*/
                }
                else if (strlen(new_trans_str) > 0 && strlen(split_str) > 0)
                {
                    /* If both number are not empty yet do not match, add a
                                 little extra penality */
                    prob -= 2;
                }
            }
        }

        /* Memo heuristics */
        {
            const char *memo = xaccSplitGetMemo(new_trans_fsplit);
            if (memo && strlen(memo) != 0)
            {
                if (safe_strcasecmp(memo, xaccSplitGetMemo(split)) == 0)
                {
                    /* An exact match of memo gives a +2 */
                    prob = prob + 2;
                    /* DEBUG("heuristics:  probability + 2 (memo)"); */
                }
                else if ((strncasecmp(memo, xaccSplitGetMemo(split),
                                      strlen(xaccSplitGetMemo(split)) / 2)
                          == 0))
                {
                    /* Very primitive fuzzy match worth +1.  This matches the
                                 first 50% of the strings to skip annoying transaction
                                 number some banks seem to include in the memo but someone
                                 should write something more sophisticated */
                    prob = prob + 1;
                    /*DEBUG("heuristics:  probability + 1 (memo)");     */
                }
            }
        }

        /* Description heuristics */
        {
            const char *descr = xaccTransGetDescription(new_trans);
            if (descr && strlen(descr) != 0)
            {
                if (safe_strcasecmp(descr,
                                    xaccTransGetDescription(xaccSplitGetParent(split)))
                        == 0)
                {
                    /*An exact match of Description gives a +2 */
                    prob = prob + 2;
                    /*DEBUG("heuristics:  probability + 2 (description)");*/
                }
                else if ((strncasecmp(descr,
                                      xaccTransGetDescription (xaccSplitGetParent(split)),
                                      strlen(xaccTransGetDescription (new_trans)) / 2)
                          == 0))
                {
                    /* Very primitive fuzzy match worth +1.  This matches the
                                 first 50% of the strings to skip annoying transaction
                                 number some banks seem to include in the memo but someone
                                 should write something more sophisticated */
                    prob = prob + 1;
                    /*DEBUG("heuristics:  probability + 1 (description)");      */
                }
            }
        }

        /* Is the probability high enough? Otherwise do nothing and return. */
        if (prob < display_threshold)
        {
            return;
        }

        /* The probability is high enough, so allocate an object
                 here. Allocating it only when it's actually being used is
                 probably quite some performance gain. */
        match_info = g_new0(GNCImportMatchInfo, 1);

        match_info->probability = prob;
        match_info->update_proposed = update_proposed;
        match_info->split = split;
        match_info->trans = xaccSplitGetParent(split);


        /* Append that to the list. Do not use g_list_append because
                   it is slow. The list is sorted afterwards anyway. */
        trans_info->match_list =
            g_list_prepend(trans_info->match_list,
                           match_info);
    }
}/* end split_find_match */


void gnc_import_find_split_matches(GNCImportTransInfo *trans_info,
                                   gint process_threshold,
                                   double fuzzy_amount_difference,
                                   gint match_date_hardlimit)
{
    GList * list_element;
    Query *query = qof_query_create_for(GNC_ID_SPLIT);
    g_assert (trans_info);

    /* Get list of splits of the originating account. */
    {
        /* We used to traverse *all* splits of the account by using
           xaccAccountGetSplitList, which is a bad idea because 90% of these
           splits are outside the date range that is interesting. We should
           rather use a query according to the date region, which is
           implemented here.
        */
        Account *importaccount =
            xaccSplitGetAccount (gnc_import_TransInfo_get_fsplit (trans_info));
        time_t download_time = xaccTransGetDate (gnc_import_TransInfo_get_trans (trans_info));

        qof_query_set_book (query, gnc_get_current_book());
        xaccQueryAddSingleAccountMatch (query, importaccount,
                                        QOF_QUERY_AND);
        xaccQueryAddDateMatchTT (query,
                                 TRUE, download_time - match_date_hardlimit * 86400,
                                 TRUE, download_time + match_date_hardlimit * 86400,
                                 QOF_QUERY_AND);
        list_element = qof_query_run (query);
        /* Sigh. Doesnt help too much. We still create and run one query
           for each imported transaction. Maybe it would improve
           performance further if there is one single (master-)query at
           the beginning, matching the full date range and all accounts in
           question. However, this doesnt quite work because this function
           here is called from each gnc_gen_trans_list_add_trans(), which
           is called one at a time. Therefore the whole importer would
           have to change its behaviour: Accept the imported txns via
           gnc_gen_trans_list_add_trans(), and only when
           gnc_gen_trans_list_run() is called, then calculate all the
           different match candidates. That's too much work for now.
        */
    }

    /* Traverse that list, calling split_find_match on each one. Note
       that xaccAccountForEachSplit is declared in Account.h but
       implemented nowhere :-( */
    while (list_element != NULL)
    {
        split_find_match (trans_info, list_element->data,
                          process_threshold, fuzzy_amount_difference);
        list_element = g_list_next (list_element);
    }

    qof_query_destroy (query);
}


/***********************************************************************
 */

gboolean
gnc_import_process_trans_item (GncImportMatchMap *matchmap,
                               GNCImportTransInfo *trans_info)
{
    Split * other_split;
    gnc_numeric imbalance_value;

    /* DEBUG("Begin"); */

    g_assert (trans_info);
    /*DEBUG("Iteration %d, action %d, split %s", i,
        trans_info->action,
        xaccTransGetDescription (gnc_import_TransInfo_get_trans
        (trans_info)))*/
    switch (gnc_import_TransInfo_get_action (trans_info))
    {
    case GNCImport_SKIP:
        return FALSE;
    case GNCImport_ADD:
        /* Transaction gets imported. */

        /* Is the transaction not balanced and there is a non-NULL destination account? */
        if (gnc_import_TransInfo_is_balanced(trans_info) == FALSE
                && gnc_import_TransInfo_get_destacc(trans_info) != NULL)
        {
            /* Create the 'other' split. */
            Split *split =
                xaccMallocSplit
                (gnc_account_get_book
                 (gnc_import_TransInfo_get_destacc (trans_info)));
            xaccTransAppendSplit
            (gnc_import_TransInfo_get_trans (trans_info), split);
            xaccAccountInsertSplit
            (gnc_import_TransInfo_get_destacc (trans_info), split);
            /*xaccSplitSetBaseValue
              (split,
               gnc_numeric_neg(xaccTransGetImbalance
                       (gnc_import_TransInfo_get_trans (trans_info))),
               xaccTransGetCurrency
               (gnc_import_TransInfo_get_trans (trans_info)));*/
            {
                /* This is a quick workaround for the bug described in
                                 http://gnucash.org/pipermail/gnucash-devel/2003-August/009982.html
                       Assume that importers won't create transactions involving two or more
                       currencies so we can use xaccTransGetImbalanceValue. */
                imbalance_value =
                    gnc_numeric_neg (xaccTransGetImbalanceValue
                                     (gnc_import_TransInfo_get_trans (trans_info)));
                xaccSplitSetValue (split, imbalance_value);
                xaccSplitSetAmount (split, imbalance_value);
            }
            /*xaccSplitSetMemo (split, _("Auto-Balance split"));
              -- disabled due to popular request */
        }

        xaccSplitSetReconcile(gnc_import_TransInfo_get_fsplit (trans_info), CREC);
        /*Set reconcile date to today*/
        xaccSplitSetDateReconciledSecs(gnc_import_TransInfo_get_fsplit (trans_info),
                                       time(NULL));
        /* Done editing. */
        xaccTransCommitEdit(gnc_import_TransInfo_get_trans (trans_info));
        return TRUE;
    case GNCImport_UPDATE:
    {
        GNCImportMatchInfo *selected_match =
            gnc_import_TransInfo_get_selected_match(trans_info);

        /* If there is no selection, ignore this transaction. */
        if (!selected_match)
        {
            PWARN("No matching translaction to be cleared was chosen. Imported transaction will be ignored.");
            break;
        }

        /* Transaction gets not imported but the matching one gets
           updated and reconciled. */
        if (gnc_import_MatchInfo_get_split(selected_match) == NULL)
        {
            PERR("The split I am trying to update and reconcile is NULL, shouldn't happen!");
        }
        else
        {
            /* Update and reconcile the matching transaction */
            /*DEBUG("BeginEdit selected_match")*/
            xaccTransBeginEdit(selected_match->trans);

            xaccTransSetDatePostedSecs(selected_match->trans,
                                       xaccTransGetDate(xaccSplitGetParent(
                                                   gnc_import_TransInfo_get_fsplit(trans_info))));

            xaccSplitSetAmount(selected_match->split,
                               xaccSplitGetAmount(
                                   gnc_import_TransInfo_get_fsplit(trans_info)));
            xaccSplitSetValue(selected_match->split,
                              xaccSplitGetValue(
                                  gnc_import_TransInfo_get_fsplit(trans_info)));

            imbalance_value = xaccTransGetImbalanceValue(
                                  gnc_import_TransInfo_get_trans(trans_info));
            other_split = xaccSplitGetOtherSplit(selected_match->split);
            if (!gnc_numeric_zero_p(imbalance_value) && other_split)
            {
                if (xaccSplitGetReconcile(other_split) == NREC)
                {
                    imbalance_value = gnc_numeric_neg(imbalance_value);
                    xaccSplitSetValue(other_split, imbalance_value);
                    xaccSplitSetAmount(other_split, imbalance_value);
                }
                /* else GC will automatically insert a split to equity
                   to balance the transaction */
            }

            xaccTransSetDescription(selected_match->trans,
                                    xaccTransGetDescription(
                                        gnc_import_TransInfo_get_trans(trans_info)));

            if (xaccSplitGetReconcile(selected_match->split) == NREC)
            {
                xaccSplitSetReconcile(selected_match->split, CREC);
            }

            /* Set reconcile date to today */
            xaccSplitSetDateReconciledSecs(selected_match->split, time(NULL));

            /* Copy the online id to the reconciled transaction, so
               the match will be remembered */
            if (gnc_import_split_has_online_id(trans_info->first_split))
            {
                gnc_import_set_split_online_id(selected_match->split,
                                               gnc_import_get_split_online_id(trans_info->first_split));
            }

            /* Done editing. */
            /*DEBUG("CommitEdit selected_match")*/
            xaccTransCommitEdit(selected_match->trans);

            /* Store the mapping to the other account in the MatchMap. */
            matchmap_store_destination(matchmap, trans_info, TRUE);

            /* Erase the downloaded transaction */
            xaccTransDestroy(trans_info->trans);
            /*DEBUG("CommitEdit trans")*/
            xaccTransCommitEdit(trans_info->trans);
            /* Very important: Make sure the freed transaction is not freed again! */
            trans_info->trans = NULL;
        }
    }
    return TRUE;
    case GNCImport_CLEAR:
    {
        GNCImportMatchInfo *selected_match =
            gnc_import_TransInfo_get_selected_match (trans_info);

        /* If there is no selection, ignore this transaction. */
        if (!selected_match)
        {
            PWARN("No matching translaction to be cleared was chosen. Imported transaction will be ignored.");
            break;
        }

        /* Transaction gets not imported but the matching one gets
           reconciled. */
        if (gnc_import_MatchInfo_get_split (selected_match) == NULL)
        {
            PERR("The split I am trying to reconcile is NULL, shouldn't happen!");
        }
        else
        {
            /* Reconcile the matching transaction */
            /*DEBUG("BeginEdit selected_match")*/
            xaccTransBeginEdit(selected_match->trans);

            if (xaccSplitGetReconcile
                    (selected_match->split) == NREC)
                xaccSplitSetReconcile
                (selected_match->split, CREC);
            /* Set reconcile date to today */
            xaccSplitSetDateReconciledSecs
            (selected_match->split, time(NULL));

            /* Copy the online id to the reconciled transaction, so
                         the match will be remembered */
            if (gnc_import_split_has_online_id(trans_info->first_split))
                gnc_import_set_split_online_id
                (selected_match->split,
                 gnc_import_get_split_online_id(trans_info->first_split));

            /* Done editing. */
            /*DEBUG("CommitEdit selected_match")*/
            xaccTransCommitEdit
            (selected_match->trans);

            /* Store the mapping to the other account in the MatchMap. */
            matchmap_store_destination (matchmap, trans_info, TRUE);

            /* Erase the downloaded transaction */
            xaccTransDestroy(trans_info->trans);
            /*DEBUG("CommitEdit trans")*/
            xaccTransCommitEdit(trans_info->trans);
            /* Very important: Make sure the freed transaction is not freed again! */
            trans_info->trans = NULL;
        }
    }
    return TRUE;
    default:
        DEBUG("Invalid GNCImportAction for this imported transaction.");
    }
    /*DEBUG("End");*/
    return FALSE;
}

/********************************************************************\
 * check_trans_online_id() Callback function used by
 * gnc_import_exists_online_id.  Takes pointers to transaction and split,
 * returns 0 if their online_id kvp_frames do NOT match, or if the split
 * belongs to the transaction
\********************************************************************/
static gint check_trans_online_id(Transaction *trans1, void *user_data)
{
    Account *account;
    Split *split1;
    Split *split2 = user_data;
    const gchar *online_id1;
    const gchar *online_id2;

    account = xaccSplitGetAccount(split2);
    split1 = xaccTransFindSplitByAccount(trans1, account);
    if (split1 == split2)
        return 0;

    /* hack - we really want to iterate over the _splits_ of the account
       instead of the transactions */
    g_assert(split1 != NULL);

    if (gnc_import_split_has_online_id(split1))
        online_id1 = gnc_import_get_split_online_id(split1);
    else
        online_id1 = gnc_import_get_trans_online_id(trans1);

    online_id2 = gnc_import_get_split_online_id(split2);

    if ((online_id1 == NULL) ||
            (online_id2 == NULL) ||
            (strcmp(online_id1, online_id2) != 0))
    {
        return 0;
    }
    else
    {
        /*printf("test_trans_online_id(): Duplicate found\n");*/
        return 1;
    }
}

gboolean gnc_import_exists_online_id (Transaction *trans)
{
    int i;
    gboolean online_id_exists = FALSE;
    Account *dest_acct;
    Split *source_split;

    /* Look for an online_id in the first split */
    source_split = xaccTransGetSplit(trans, 0);
    g_assert(source_split);

    /* DEBUG("%s%d%s","Checking split ",i," for duplicates"); */
    dest_acct = xaccSplitGetAccount(source_split);
    online_id_exists = xaccAccountForEachTransaction(dest_acct,
                       check_trans_online_id,
                       source_split);

    /* If it does, abort the process for this transaction, since it is
       already in the system. */
    if (online_id_exists == TRUE)
    {
        DEBUG("%s", "Transaction with same online ID exists, destroying current transaction");
        xaccTransDestroy(trans);
        xaccTransCommitEdit(trans);
    }
    return online_id_exists;
}


/* ******************************************************************
 */

GNCImportTransInfo *
gnc_import_TransInfo_new (Transaction *trans, GncImportMatchMap *matchmap)
{
    GNCImportTransInfo *transaction_info;
    Split *split;
    g_assert (trans);

    transaction_info = g_new0(GNCImportTransInfo, 1);

    transaction_info->trans = trans;
    /* Only use first split, the source split */
    split = xaccTransGetSplit(trans, 0);
    g_assert(split);
    transaction_info->first_split = split;

    /* Try to find a previously selected destination account
       string match for the ADD action */
    gnc_import_TransInfo_set_destacc (transaction_info,
                                      matchmap_find_destination (matchmap, transaction_info),
                                      FALSE);
    return transaction_info;
}


static gint compare_probability (gconstpointer a,
                                 gconstpointer b)
{
    return(((GNCImportMatchInfo *)b)->probability -
           ((GNCImportMatchInfo *)a)->probability);
}

void
gnc_import_TransInfo_init_matches (GNCImportTransInfo *trans_info,
                                   GNCImportSettings *settings)
{
    GNCImportMatchInfo * best_match = NULL;
    g_assert (trans_info);


    /* Find all split matches in originating account. */
    gnc_import_find_split_matches(trans_info,
                                  gnc_import_Settings_get_display_threshold (settings),
                                  gnc_import_Settings_get_fuzzy_amount (settings),
                                  gnc_import_Settings_get_match_date_hardlimit (settings));

    if (trans_info->match_list != NULL)
    {
        trans_info->match_list = g_list_sort(trans_info->match_list,
                                             compare_probability);
        best_match = g_list_nth_data(trans_info->match_list, 0);
        gnc_import_TransInfo_set_selected_match (trans_info,
                best_match,
                FALSE);
        if (best_match != NULL &&
                best_match->probability >= gnc_import_Settings_get_clear_threshold(settings))
        {
            trans_info->action = GNCImport_CLEAR;
            trans_info->selected_match_info = best_match;
        }
        else if (best_match == NULL ||
                 best_match->probability <= gnc_import_Settings_get_add_threshold(settings))
        {
            trans_info->action = GNCImport_ADD;
        }
        else if (gnc_import_Settings_get_action_skip_enabled(settings))
        {
            trans_info->action = GNCImport_SKIP;
        }
        else if (gnc_import_Settings_get_action_update_enabled(settings))
        {
            trans_info->action = GNCImport_UPDATE;
        }
        else
        {
            trans_info->action = GNCImport_ADD;
        }
    }
    else
    {
        trans_info->action = GNCImport_ADD;
    }
    if (best_match &&
            trans_info->action == GNCImport_CLEAR &&
            gnc_import_Settings_get_action_update_enabled(settings))
    {
        if (best_match->update_proposed)
        {
            trans_info->action = GNCImport_UPDATE;
        }
    }

    trans_info->previous_action = trans_info->action;
}


/* Try to automatch a transaction to a destination account if the */
/* transaction hasn't already been manually assigned to another account */
gboolean
gnc_import_TransInfo_refresh_destacc (GNCImportTransInfo *transaction_info,
                                      GncImportMatchMap *matchmap)
{
    Account *orig_destacc;
    Account *new_destacc = NULL;
    g_assert(transaction_info);

    orig_destacc = gnc_import_TransInfo_get_destacc(transaction_info);

    /* if we haven't manually selected a destination account for this transaction */
    if (gnc_import_TransInfo_get_destacc_selected_manually(transaction_info) == FALSE)
    {
        /* Try to find the destination account for this transaction based on prior ones */
        new_destacc = matchmap_find_destination(matchmap, transaction_info);
        gnc_import_TransInfo_set_destacc(transaction_info, new_destacc, FALSE);
    }
    else
    {
        new_destacc = orig_destacc;
    }

    /* account has changed */
    if (new_destacc != orig_destacc)
    {
        return TRUE;
    }
    else   /* account is the same */
    {
        return FALSE;
    }
}