/*
 * Copyright (C) 2009, 2011, 2016  J. Ali Harlow <ali@juiblex.co.uk>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <lua.h>
#include "config.h"
#include "plover/plover.h"
#include "whelk/whelk.h"

LUALIB_API int luaopen_posix(lua_State *L);

void update(const char *argv0)
{
    char *yum_uri,*local_database,*active_database,*alternate_database;
    gchar *s,*prefix,*distribution,*vendor_prefix;
    int ch;
    struct comps *comps;
    GError *error=NULL;
    s=plover_get_program(argv0);
    yum_uri=razor_path_to_uri(s);
    g_free(s);
    s=g_strconcat(yum_uri,"/repodata/comps.xml",NULL);
    comps=plover_comps_new_from_uri(s,&error);
    g_free(s);
    if (g_error_matches(error,PLOVER_RAZOR_ERROR,
      RAZOR_GENERAL_ERROR_UNSUPPORTED_ARCHIVE))
    {
	g_clear_error(&error);
	free(yum_uri);
	s=plover_get_program_directory(argv0);
	yum_uri=razor_path_to_uri(s);
	g_free(s);
	s=g_strconcat(yum_uri,"/repodata/comps.xml",NULL);
	comps=plover_comps_new_from_uri(s,&error);
    }
    if (!comps)
    {
	fprintf(stderr,"%s\n",error->message);
	g_error_free(error);
	exit(1);
    }
    prefix=plover_comps_get_default_prefix(comps);
    if (prefix)
    {
	s=g_strconcat(prefix,"/var/lib/razor",NULL);
	local_database=razor_path_to_uri(s);
	g_free(s);
    }
    else
	local_database=NULL;
    switch(comps->database)
    {
	case COMPS_DATABASE_DISTRIBUTION_LOCAL:
	    active_database=local_database;
	    alternate_database=NULL;
	    break;
	case COMPS_DATABASE_GLOBAL:
	    active_database=NULL;
	    alternate_database=local_database;
	    break;
    }
    if (prefix)
    {
	distribution=g_strdup(comps->distribution);
	plover_comps_set_distribution(comps,NULL);
	vendor_prefix=plover_comps_get_default_prefix(comps);
	plover_comps_set_distribution(comps,distribution);
	g_free(distribution);
	razor_set_database_uri(alternate_database);
	if (plover_installed_files_match_prefix(vendor_prefix)==1)
	{
	    printf("There is an existing installation under %s\n"
	      "which is not compatible with this distribution. In order\n"
	      "to continue, the existing installation must be uninstalled.\n"
	      "Do you want to remove all packages in the existing installion? ",
	      prefix);
	    ch=getchar();
	    if (ch!='y' && ch!='Y' && ch!=EOF && ch!='\n')
		exit(1);
	    while(ch!='\n' && ch!=EOF)
		ch=getchar();
	    if (plover_remove(NULL,&error))
	    {
		fprintf(stderr,"%s\n",error->message);
		g_error_free(error);
		exit(1);
	    }
	}
	g_free(vendor_prefix);
    }
    razor_set_database_uri(active_database);
    if (prefix && !plover_installed_files_match_prefix(prefix))
    {
	printf("The existing installation is not under %s\n"
	  "In order to continue, all the existing packages must be removed.\n"
	  "Do you want to remove all existing packages? ",prefix);
	ch=getchar();
	if (ch!='y' && ch!='Y' && ch!=EOF && ch!='\n')
	    exit(1);
	while(ch!='\n' && ch!=EOF)
	    ch=getchar();
	if (plover_remove(NULL,&error))
	{
	    fprintf(stderr,"%s\n",error->message);
	    g_error_free(error);
	    exit(1);
	}
    }
    free(local_database);
    plover_comps_free(comps);
    if (!plover_update_uri(yum_uri,prefix,NULL,&error))
    {
	fprintf(stderr,"%s\n",error->message);
	g_error_free(error);
	exit(1);
    }
    g_free(prefix);
    free(yum_uri);
}

int main(int argc,char **argv)
{
    plover_exception_handler_init();
    razor_set_lua_loader("posix",(void (*)())luaopen_posix);
    razor_set_lua_loader("whelk",(void (*)())luaopen_whelk);
    update(argv[0]);
    exit(0);
}