/********************************************************************\
 * gnc-employee-xml-v2.c -- employee xml i/o implementation         *
 *                                                                  *
 * Copyright (C) 2002 Derek Atkins <warlord@MIT.EDU>                *
 *                                                                  *
 * 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 <glib.h>

#include <config.h>
#include <stdlib.h>
#include <string.h>
#include "gncEmployeeP.h"
#include "gnc-xml-helper.h"
#include "sixtp.h"
#include "sixtp-utils.h"
#include "sixtp-parsers.h"
#include "sixtp-utils.h"
#include "sixtp-dom-parsers.h"
#include "sixtp-dom-generators.h"

#include "gnc-xml.h"
#include "io-gncxml-gen.h"
#include "io-gncxml-v2.h"

#include "gnc-employee-xml-v2.h"
#include "gnc-address-xml-v2.h"

#define _GNC_MOD_NAME   GNC_ID_EMPLOYEE

static QofLogModule log_module = GNC_MOD_IO;

const gchar* employee_version_string = "2.0.0";

/* ids */
#define gnc_employee_string "gnc:GncEmployee"
#define employee_username_string "employee:username"
#define employee_guid_string "employee:guid"
#define employee_id_string "employee:id"
#define employee_addr_string "employee:addr"
#define employee_language_string "employee:language"
#define employee_acl_string "employee:acl"
#define employee_active_string "employee:active"
#define employee_workday_string "employee:workday"
#define employee_rate_string "employee:rate"
#define employee_currency_string "employee:currency"
#define employee_ccard_string "employee:ccard"
#define employee_slots_string "employee:slots"

static void
maybe_add_string (xmlNodePtr ptr, const char* tag, const char* str)
{
    if (str && *str)
        xmlAddChild (ptr, text_to_dom_tree (tag, str));
}

static xmlNodePtr
employee_dom_tree_create (GncEmployee* employee)
{
    xmlNodePtr ret;
    gnc_numeric num;
    Account* ccard_acc;

    ret = xmlNewNode (NULL, BAD_CAST gnc_employee_string);
    xmlSetProp (ret, BAD_CAST "version", BAD_CAST employee_version_string);

    xmlAddChild (ret, guid_to_dom_tree (employee_guid_string,
                                        qof_instance_get_guid (QOF_INSTANCE (employee))));

    xmlAddChild (ret, text_to_dom_tree (employee_username_string,
                                        gncEmployeeGetUsername (employee)));

    xmlAddChild (ret, text_to_dom_tree (employee_id_string,
                                        gncEmployeeGetID (employee)));

    xmlAddChild (ret, gnc_address_to_dom_tree (employee_addr_string,
                                               gncEmployeeGetAddr (employee)));

    maybe_add_string (ret, employee_language_string,
                      gncEmployeeGetLanguage (employee));
    maybe_add_string (ret, employee_acl_string, gncEmployeeGetAcl (employee));

    xmlAddChild (ret, int_to_dom_tree (employee_active_string,
                                       gncEmployeeGetActive (employee)));

    num = gncEmployeeGetWorkday (employee);
    xmlAddChild (ret, gnc_numeric_to_dom_tree (employee_workday_string, &num));

    num = gncEmployeeGetRate (employee);
    xmlAddChild (ret, gnc_numeric_to_dom_tree (employee_rate_string, &num));

    xmlAddChild
    (ret,
     commodity_ref_to_dom_tree (employee_currency_string,
                                gncEmployeeGetCurrency (employee)));

    ccard_acc = gncEmployeeGetCCard (employee);
    if (ccard_acc)
        xmlAddChild (ret, guid_to_dom_tree (employee_ccard_string,
                                            qof_instance_get_guid (QOF_INSTANCE (ccard_acc))));

    /* xmlAddChild won't do anything with a NULL, so tests are superfluous. */
    xmlAddChild (ret, qof_instance_slots_to_dom_tree (employee_slots_string,
                                                      QOF_INSTANCE (employee)));
    return ret;
}

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

struct employee_pdata
{
    GncEmployee* employee;
    QofBook* book;
};

static gboolean
set_string (xmlNodePtr node, GncEmployee* employee,
            void (*func) (GncEmployee* employee, const char* txt))
{
    char* txt = dom_tree_to_text (node);
    g_return_val_if_fail (txt, FALSE);

    func (employee, txt);

    g_free (txt);

    return TRUE;
}

static gboolean
employee_username_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);

    return set_string (node, pdata->employee, gncEmployeeSetUsername);
}

static gboolean
employee_guid_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);
    GncGUID* guid;
    GncEmployee* employee;

    guid = dom_tree_to_guid (node);
    g_return_val_if_fail (guid, FALSE);

    /* See if we've already created this one */
    employee = gncEmployeeLookup (pdata->book, guid);
    if (employee)
    {
        gncEmployeeDestroy (pdata->employee);
        pdata->employee = employee;
        gncEmployeeBeginEdit (employee);
    }
    else
    {
        gncEmployeeSetGUID (pdata->employee, guid);
    }

    guid_free (guid);

    return TRUE;
}

static gboolean
employee_id_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);

    return set_string (node, pdata->employee, gncEmployeeSetID);
}

static gboolean
employee_language_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);

    return set_string (node, pdata->employee, gncEmployeeSetLanguage);
}

static gboolean
employee_acl_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);

    return set_string (node, pdata->employee, gncEmployeeSetAcl);
}

static gboolean
employee_addr_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);

    return gnc_dom_tree_to_address (node, gncEmployeeGetAddr (pdata->employee));
}

static gboolean
employee_active_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);
    gint64 val;
    gboolean ret;

    ret = dom_tree_to_integer (node, &val);
    if (ret)
        gncEmployeeSetActive (pdata->employee, (gboolean)val);

    return ret;
}

static gboolean
employee_workday_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);

    gncEmployeeSetWorkday (pdata->employee, dom_tree_to_gnc_numeric (node));
    return TRUE;
}

static gboolean
employee_rate_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);

    gncEmployeeSetRate (pdata->employee, dom_tree_to_gnc_numeric (node));
    return TRUE;
}

static gboolean
employee_currency_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);
    gnc_commodity* com;

    com = dom_tree_to_commodity_ref (node, pdata->book);
    g_return_val_if_fail (com, FALSE);

    gncEmployeeSetCurrency (pdata->employee, com);

    return TRUE;
}

static gboolean
employee_ccard_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);
    GncGUID* guid;
    Account* ccard_acc;

    guid = dom_tree_to_guid (node);
    g_return_val_if_fail (guid, FALSE);

    ccard_acc = xaccAccountLookup (guid, pdata->book);
    guid_free (guid);

    g_return_val_if_fail (ccard_acc, FALSE);
    gncEmployeeSetCCard (pdata->employee, ccard_acc);

    return TRUE;
}

static gboolean
employee_slots_handler (xmlNodePtr node, gpointer employee_pdata)
{
    struct employee_pdata* pdata = static_cast<decltype (pdata)> (employee_pdata);
    return dom_tree_create_instance_slots (node, QOF_INSTANCE (pdata->employee));
}

static struct dom_tree_handler employee_handlers_v2[] =
{
    { employee_username_string, employee_username_handler, 1, 0 },
    { employee_guid_string, employee_guid_handler, 1, 0 },
    { employee_id_string, employee_id_handler, 1, 0 },
    { employee_addr_string, employee_addr_handler, 1, 0 },
    { employee_language_string, employee_language_handler, 0, 0 },
    { employee_acl_string, employee_acl_handler, 0, 0 },
    { employee_active_string, employee_active_handler, 1, 0 },
    { employee_workday_string, employee_workday_handler, 1, 0 },
    { employee_rate_string, employee_rate_handler, 1, 0 },
    { employee_currency_string, employee_currency_handler, 0, 0 }, /* XXX */
    { "employee:commodity", employee_currency_handler, 0, 0 }, /* XXX */
    { employee_ccard_string, employee_ccard_handler, 0, 0 },
    { employee_slots_string, employee_slots_handler, 0, 0 },
    { NULL, 0, 0, 0 }
};

static GncEmployee*
dom_tree_to_employee (xmlNodePtr node, QofBook* book)
{
    struct employee_pdata employee_pdata;
    gboolean successful;

    employee_pdata.employee = gncEmployeeCreate (book);
    employee_pdata.book = book;
    gncEmployeeBeginEdit (employee_pdata.employee);

    successful = dom_tree_generic_parse (node, employee_handlers_v2,
                                         &employee_pdata);
    if (successful)
        gncEmployeeCommitEdit (employee_pdata.employee);
    else
    {
        PERR ("failed to parse employee tree");
        gncEmployeeDestroy (employee_pdata.employee);
        employee_pdata.employee = NULL;
    }

    return employee_pdata.employee;
}

static gboolean
gnc_employee_end_handler (gpointer data_for_children,
                          GSList* data_from_children, GSList* sibling_data,
                          gpointer parent_data, gpointer global_data,
                          gpointer* result, const gchar* tag)
{
    GncEmployee* employee;
    xmlNodePtr tree = (xmlNodePtr)data_for_children;
    gxpf_data* gdata = (gxpf_data*)global_data;
    QofBook* book = static_cast<decltype (book)> (gdata->bookdata);


    if (parent_data)
    {
        return TRUE;
    }

    /* OK.  For some messed up reason this is getting called again with a
       NULL tag.  So we ignore those cases */
    if (!tag)
    {
        return TRUE;
    }

    g_return_val_if_fail (tree, FALSE);

    employee = dom_tree_to_employee (tree, book);
    if (employee != NULL)
    {
        gdata->cb (tag, gdata->parsedata, employee);
    }

    xmlFreeNode (tree);

    return employee != NULL;
}

static sixtp*
employee_sixtp_parser_create (void)
{
    return sixtp_dom_parser_new (gnc_employee_end_handler, NULL, NULL);
}

static gboolean
employee_should_be_saved (GncEmployee* employee)
{
    const char* id;

    /* make sure this is a valid employee before we save it -- should have an ID */
    id = gncEmployeeGetID (employee);
    if (id == NULL || *id == '\0')
        return FALSE;

    return TRUE;
}

static void
do_count (QofInstance* employee_p, gpointer count_p)
{
    int* count = static_cast<decltype (count)> (count_p);
    if (employee_should_be_saved ((GncEmployee*) employee_p))
        (*count)++;
}

static int
employee_get_count (QofBook* book)
{
    int count = 0;
    qof_object_foreach (_GNC_MOD_NAME, book, do_count, (gpointer) &count);
    return count;
}

static void
xml_add_employee (QofInstance* employee_p, gpointer out_p)
{
    xmlNodePtr node;
    GncEmployee* employee = (GncEmployee*) employee_p;
    FILE* out = static_cast<decltype (out)> (out_p);

    if (ferror (out))
        return;
    if (!employee_should_be_saved (employee))
        return;

    node = employee_dom_tree_create (employee);
    xmlElemDump (out, NULL, node);
    xmlFreeNode (node);
    if (ferror (out) || fprintf (out, "\n") < 0)
        return;
}

static gboolean
employee_write (FILE* out, QofBook* book)
{
    qof_object_foreach_sorted (_GNC_MOD_NAME, book, xml_add_employee,
                               (gpointer) out);
    return ferror (out) == 0;
}

static gboolean
employee_ns (FILE* out)
{
    g_return_val_if_fail (out, FALSE);
    return gnc_xml2_write_namespace_decl (out, "employee");
}

void
gnc_employee_xml_initialize (void)
{
    static GncXmlDataType_t be_data =
    {
        GNC_FILE_BACKEND_VERS,
        gnc_employee_string,
        employee_sixtp_parser_create,
        NULL,           /* add_item */
        employee_get_count,
        employee_write,
        NULL,           /* scrub */
        employee_ns,
    };

    gnc_xml_register_backend (be_data);
}
