/********************************************************************\
 * gnc-employee-sql.c -- employee sql implementation                *
 *                                                                  *
 * 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                   *
 *                                                                  *
\********************************************************************/

/** @file gnc-employee-sql.c
 *  @brief load and save address data to SQL
 *  @author Copyright (c) 2007-2008 Phil Longstaff <plongstaff@rogers.com>
 *
 * This file implements the top-level QofBackend API for saving/
 * restoring data to/from an SQL database
 */

#include "config.h"

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

#include "gnc-commodity.h"

#include "gnc-backend-sql.h"
#include "gnc-slots-sql.h"
#include "gnc-commodity-sql.h"

#include "gncEmployeeP.h"
#include "gnc-employee-sql.h"
#include "gnc-address-sql.h"

#define _GNC_MOD_NAME	GNC_ID_EMPLOYEE

static QofLogModule log_module = G_LOG_DOMAIN;

#define MAX_USERNAME_LEN 2048
#define MAX_ID_LEN 2048
#define MAX_LANGUAGE_LEN 2048
#define MAX_ACL_LEN 2048

#define TABLE_NAME "employees"
#define TABLE_VERSION 2

static GncSqlColumnTableEntry col_table[] =
{
    { "guid",       CT_GUID,          0,                COL_NNUL | COL_PKEY, "guid" },
    { "username",   CT_STRING,        MAX_USERNAME_LEN, COL_NNUL,            "username" },
    { "id",         CT_STRING,        MAX_ID_LEN,       COL_NNUL,            "id" },
    { "language",   CT_STRING,        MAX_LANGUAGE_LEN, COL_NNUL,            "language" },
    { "acl",        CT_STRING,        MAX_ACL_LEN,      COL_NNUL,            "acl" },
    { "active",     CT_BOOLEAN,       0,                COL_NNUL,            "active" },
    { "currency",   CT_COMMODITYREF,  0,                COL_NNUL,            "currency" },
    { "ccard_guid", CT_ACCOUNTREF,    0,                0,                   "credit-card-account" },
    { "workday",    CT_NUMERIC,       0,                COL_NNUL,            "workday" },
    { "rate",       CT_NUMERIC,       0,                COL_NNUL,            "rate" },
    { "addr",       CT_ADDRESS,       0,                0,                   "address" },
    { NULL }
};

static GncEmployee*
load_single_employee( GncSqlBackend* be, GncSqlRow* row )
{
    const GncGUID* guid;
    GncEmployee* pEmployee;

    g_return_val_if_fail( be != NULL, NULL );
    g_return_val_if_fail( row != NULL, NULL );

    guid = gnc_sql_load_guid( be, row );
    pEmployee = gncEmployeeLookup( be->book, guid );
    if ( pEmployee == NULL )
    {
        pEmployee = gncEmployeeCreate( be->book );
    }
    gnc_sql_load_object( be, row, GNC_ID_EMPLOYEE, pEmployee, col_table );
    qof_instance_mark_clean( QOF_INSTANCE(pEmployee) );

    return pEmployee;
}

static void
load_all_employees( GncSqlBackend* be )
{
    GncSqlStatement* stmt;
    GncSqlResult* result;

    g_return_if_fail( be != NULL );

    stmt = gnc_sql_create_select_statement( be, TABLE_NAME );
    result = gnc_sql_execute_select_statement( be, stmt );
    gnc_sql_statement_dispose( stmt );
    if ( result != NULL )
    {
        GncSqlRow* row;
        GList* list = NULL;

        row = gnc_sql_result_get_first_row( result );
        while ( row != NULL )
        {
            GncEmployee* pEmployee = load_single_employee( be, row );
            if ( pEmployee != NULL )
            {
                list = g_list_append( list, pEmployee );
            }
            row = gnc_sql_result_get_next_row( result );
        }
        gnc_sql_result_dispose( result );

        if ( list != NULL )
        {
            gnc_sql_slots_load_for_list( be, list );
            g_list_free( list );
        }
    }
}

/* ================================================================= */
static void
create_employee_tables( GncSqlBackend* be )
{
    gint version;

    g_return_if_fail( be != NULL );

    version = gnc_sql_get_table_version( be, TABLE_NAME );
    if ( version == 0 )
    {
        gnc_sql_create_table( be, TABLE_NAME, TABLE_VERSION, col_table );
    }
    else if ( version == 1 )
    {
        /* Upgrade 64 bit int handling */
        gnc_sql_upgrade_table( be, TABLE_NAME, col_table );
        gnc_sql_set_table_version( be, TABLE_NAME, TABLE_VERSION );

        PINFO("Employees table upgraded from version 1 to version %d\n", TABLE_VERSION);
    }
}

/* ================================================================= */
static gboolean
save_employee( GncSqlBackend* be, QofInstance* inst )
{
    GncEmployee* emp;
    const GncGUID* guid;
    gint op;
    gboolean is_infant;
    gboolean is_ok = TRUE;

    g_return_val_if_fail( inst != NULL, FALSE );
    g_return_val_if_fail( GNC_IS_EMPLOYEE(inst), FALSE );
    g_return_val_if_fail( be != NULL, FALSE );

    emp = GNC_EMPLOYEE(inst);

    is_infant = qof_instance_get_infant( inst );
    if ( qof_instance_get_destroying( inst ) )
    {
        op = OP_DB_DELETE;
    }
    else if ( be->is_pristine_db || is_infant )
    {
        op = OP_DB_INSERT;
    }
    else
    {
        op = OP_DB_UPDATE;
    }
    if ( op != OP_DB_DELETE )
    {
        // Ensure the commodity is in the db
        is_ok = gnc_sql_save_commodity( be, gncEmployeeGetCurrency( emp ) );
    }

    if ( is_ok )
    {
        is_ok = gnc_sql_do_db_operation( be, op, TABLE_NAME, GNC_ID_EMPLOYEE, emp, col_table );
    }

    if ( is_ok )
    {
        // Now, commit or delete any slots
        guid = qof_instance_get_guid( inst );
        if ( !qof_instance_get_destroying(inst) )
        {
            is_ok = gnc_sql_slots_save( be, guid, is_infant, qof_instance_get_slots( inst ) );
        }
        else
        {
            is_ok = gnc_sql_slots_delete( be, guid );
        }
    }

    return is_ok;
}

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

    g_return_val_if_fail( employee != NULL, FALSE );

    /* 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
write_single_employee( QofInstance *term_p, gpointer data_p )
{
    write_objects_t* s = (write_objects_t*)data_p;

    g_return_if_fail( term_p != NULL );
    g_return_if_fail( GNC_IS_EMPLOYEE(term_p) );
    g_return_if_fail( data_p != NULL );

    if ( s->is_ok && employee_should_be_saved( GNC_EMPLOYEE(term_p) ) )
    {
        s->is_ok = save_employee( s->be, term_p );
    }
}

static gboolean
write_employees( GncSqlBackend* be )
{
    write_objects_t data;

    g_return_val_if_fail( be != NULL, FALSE );

    data.be = be;
    data.is_ok = TRUE;
    qof_object_foreach( GNC_ID_EMPLOYEE, be->book, write_single_employee, &data );

    return data.is_ok;
}

/* ================================================================= */
void
gnc_employee_sql_initialize( void )
{
    static GncSqlObjectBackend be_data =
    {
        GNC_SQL_BACKEND_VERSION,
        GNC_ID_EMPLOYEE,
        save_employee,						/* commit */
        load_all_employees,					/* initial_load */
        create_employee_tables,				/* create_tables */
        NULL, NULL, NULL,
        write_employees						/* write */
    };

    qof_object_register_backend( GNC_ID_EMPLOYEE, GNC_SQL_BACKEND, &be_data );
}
/* ========================== END OF FILE ===================== */
