function install_next() {
	if ( step == 1 ) {
		// check requirements
		install_step();
	} else if ( step == 2 ) {
		// check engine database info
		db_check('engine', 0);
	} else if ( step == 3 ) {
		// check authentication database info
		if ( $('authtyperemote').checked ) {
			$('newinstalladmin').className = 'ac_hidden';
			$('oldinstalladmin').className = 'ac_block';
			db_check('auth', 0);
		} else {
			$('newinstalladmin').className = 'ac_block';
			$('oldinstalladmin').className = 'ac_hidden';
			// just increment step
			install_step();
		}
	} else if ( step == 4 ) {
		// check software settings
		admin_check($('authtyperemote').checked);
	} else if ( step == 5 ) {
		window.location = 'index.php';
	}
}

function install_step() {
	step++;
	$('checks').className = ( step == 1 ? 'ac_block' : 'ac_hidden' );
	$('engine').className = ( step == 2 ? 'ac_block' : 'ac_hidden' );
	$('auth').className = ( step == 3 ? 'ac_block' : 'ac_hidden' );
	$('settings').className = ( step == 4 ? 'ac_block' : 'ac_hidden' );
	$('installer').className = ( step == 5 ? 'ac_block' : 'ac_hidden' );
	var menu = $('installmenu').getElementsByTagName('li');
	for ( var i = 0; i < menu.length; i++ ) {
		if ( step == i - 1 ) {
			menu[i].className = 'currentstep';
		} else if ( step < i - 1 ) {
			menu[i].className = 'nextstep';
		} else {
			menu[i].className = 'previousstep';
		}
	}
}

function db_check(type, clear) {
	var host = $(type + 'Host');
	var user = $(type + 'User');
	var pass = $(type + 'Pass');
	var name = $(type + 'Name');
	if ( host == '' ) host = 'localhost';
	ac_ui_api_call(jsLoading, 60);
	ac_ajax_call_cb(
		apipath,
		'instup!database_check',
		( type == 'engine' ? db_check_engine_cb : db_check_auth_cb ),
		type,
		host.value,
		user.value,
		pass.value,
		name.value,
		( type == 'engine' && $(type + 'Create').checked ? 1 : 0 ),
		clear
	);
}

function db_check_engine_cb(xml) {
	var ary = ac_dom_read_node(xml, ac_b64_decode);
	ac_ui_api_callback();
	if ( ary.succeeded && ary.succeeded == 1 ) {
		if ( ary.found > 0 ) {
			if ( confirm(sprintf(installerFoundTables, appname) + installerFoundTablesOptions) ) {
				if ( confirm(installerRemoveTablesConfirm) ) {
					db_check('engine', 1);
				}
			}
		} else {
			ac_result_show(ary.message);
			install_step();
		}
	} else {
		ac_error_show(ary.message);
	}
}

function db_check_auth_cb(xml) {
	var ary = ac_dom_read_node(xml, ac_b64_decode);
	ac_ui_api_callback();
	if ( ary.succeeded && ary.succeeded == 1 ) {
		if ( typeof ary.tables['acp_globalauth'] == 'undefined' ) {
			alert(installerAuthTableMissing);
		} else {
			ac_result_show(ary.message);
			install_step();
		}
	} else {
		ac_error_show(ary.message);
	}
}



function admin_check(remote) {
	var post = ac_form_post('siteForm');
	if ( post.password == '' ) {
		alert(jsUserFormPasswordBlank);
		$('adminpassword').focus();
		return;
	}
	post.remoteauth = ( remote ? 1 : 0 );
	if ( remote ) {
		ac_ui_api_call(jsChecking, 60);
	} else {
		ac_ui_api_call(jsSaving);
	}
	ac_ajax_post_cb(apipath, 'instup!admin_check', admin_check_cb, post);
}

function admin_check_cb(xml) {
	var ary = ac_dom_read_node(xml, ac_b64_decode);
	ac_ui_api_callback();
	if ( ary.succeeded && ary.succeeded == 1 ) {
		ac_result_show(jsInstalling);
		install_step();
		$('installeriframe').src = plink + "/ac_global/scripts/installi.php";
	} else {
		ac_error_show(ary.message);
	}
}