/********************************************************************
 * gnc-engine.c  -- top-level initialization for GnuCash Engine     *
 * Copyright 2000 Bill Gribble <grib@billgribble.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, 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 <glib.h>
#include "gnc-engine.h"
#include "qof.h"
#include "cashobjects.h"
#include "AccountP.h"
#include "SX-book-p.h"
#include "gnc-budget.h"
#include "TransactionP.h"
#include "gnc-commodity.h"
#include "gnc-pricedb-p.h"

/** gnc file backend library name */
#define GNC_LIB_NAME "gncmod-backend-xml"

/* gnc-backend-file location */
#include "gnc-path.h"

static GList * engine_init_hooks = NULL;
static int engine_is_initialized = 0;

EngineCommitErrorCallback g_error_cb;
gpointer g_error_cb_data;

// static QofLogModule log_module = GNC_MOD_ENGINE;

/********************************************************************
 * gnc_engine_init
 * initialize backend, load any necessary databases, etc.
 ********************************************************************/

static void
gnc_engine_init_part1()
{
    if (1 == engine_is_initialized) return;

    /* initialize QOF */
    qof_init();

    /* Now register our core types */
    cashobjects_register();
}

static void
gnc_engine_init_part2()
{
    gchar *pkglibdir;
    const gchar *builddir = g_getenv ("GNC_BUILDDIR");
    gboolean uninstalled = (g_getenv ("GNC_UNINSTALLED") != NULL
                            && builddir != NULL);

    static struct
    {
        const gchar* subdir;
        const gchar* lib;
        gboolean required;
    } libs[] =
    {
#if defined( HAVE_DBI_DBI_H )
        { "dbi", "gncmod-backend-dbi", TRUE },
#endif
        { "xml", "gncmod-backend-xml", TRUE },
        { NULL, FALSE }
    }, *lib;

    if (uninstalled)
        pkglibdir = g_build_path (G_DIR_SEPARATOR_S, builddir,
                                  "src", "backend", NULL);
    else
        pkglibdir = gnc_path_get_pkglibdir ();

    for (lib = libs; lib->lib ; lib++)
    {
        gchar *libdir;
        if (uninstalled)
            libdir = g_build_path (G_DIR_SEPARATOR_S, pkglibdir,
                                   lib->subdir, ".libs", NULL);
        else
            libdir = pkglibdir;
        if (qof_load_backend_library(libdir, lib->lib))
        {
            engine_is_initialized = 1;
        }
        else
        {
            g_warning("failed to load %s from %s\n", lib->lib, libdir);
            /* If this is a required library, stop now! */
            if (lib->required)
            {
                g_critical("required library %s not found.\n", lib->lib);
            }
        }
        if (uninstalled)
            g_free (libdir);
    }
    g_free (pkglibdir);
}

static void
gnc_engine_init_part3(int argc, char ** argv)
{
    GList * cur;
    /* call any engine hooks */
    for (cur = engine_init_hooks; cur; cur = cur->next)
    {
        gnc_engine_init_hook_t hook = (gnc_engine_init_hook_t)cur->data;

        if (hook)
            (*hook)(argc, argv);
    }
}

void
gnc_engine_init(int argc, char ** argv)
{
    gnc_engine_init_part1();
    gnc_engine_init_part2();
    gnc_engine_init_part3(argc, argv);
}

void
gnc_engine_init_static(int argc, char ** argv)
{
    gnc_engine_init_part1();
    gnc_engine_init_part3(argc, argv);
}


/********************************************************************
 * gnc_engine_shutdown
 * shutdown backend, destroy any global data, etc.
 ********************************************************************/

void
gnc_engine_shutdown (void)
{
    qof_log_shutdown();
    qof_close();
    engine_is_initialized = 0;
}

/********************************************************************
 * gnc_engine_add_init_hook
 * add a startup hook
 ********************************************************************/

void
gnc_engine_add_init_hook(gnc_engine_init_hook_t h)
{
    engine_init_hooks = g_list_append(engine_init_hooks, (gpointer)h);
}

gboolean
gnc_engine_is_initialized (void)
{
    return (engine_is_initialized == 1) ? TRUE : FALSE;
}

/* replicate old gnc-trace enum behaviour
 *
 * these are only here as a convenience, they could be
 * initialised elsewhere as appropriate.
 * */
void gnc_log_default(void)
{
    qof_log_set_default(QOF_LOG_WARNING);
    qof_log_set_level(GNC_MOD_ROOT, QOF_LOG_WARNING);
    qof_log_set_level(GNC_MOD_TEST, QOF_LOG_DEBUG);
}

void
gnc_engine_add_commit_error_callback( EngineCommitErrorCallback cb, gpointer data )
{
    g_error_cb = cb;
    g_error_cb_data = data;
}

void
gnc_engine_signal_commit_error( QofBackendError errcode )
{
    if ( g_error_cb != NULL )
    {
        (*g_error_cb)( g_error_cb_data, errcode );
    }
}
