'use strict';
'require uci';
'require fs';
'require form';
'require tools.widgets as widgets';
'require shadowsocks-libev as ss';

var conf = 'shadowsocks-libev';

function src_dst_option(s /*, ... */) {
	var o = s.taboption.apply(s, L.varargs(arguments, 1));
	o.datatype = 'or(ipaddr,cidr)';
}

return L.view.extend({
	load: function() {
		return Promise.all([
			L.resolveDefault(fs.stat('/usr/lib/iptables/libxt_recent.so'), {}),
			L.resolveDefault(fs.stat('/usr/bin/ss-rules'), null),
			uci.load(conf).then(function() {
				if (!uci.get_first(conf, 'ss_rules')) {
					uci.set(conf, uci.add(conf, 'ss_rules', 'ss_rules'), 'disabled', '1');
				}
			})
		]);
	},
	render: function(stats) {
		var m, s, o;

		m = new form.Map(conf, _('Redir Rules'),
			_('On this page you can configure how traffics are to be \
				forwarded to ss-redir instances. \
				If enabled, packets will first have their src ip addresses checked \
				against <em>Src ip/net bypass</em>, <em>Src ip/net forward</em>, \
				<em>Src ip/net checkdst</em> and if none matches <em>Src default</em> \
				will give the default action to be taken. \
				If the prior check results in action <em>checkdst</em>, packets will continue \
				to have their dst addresses checked.'));

		s = m.section(form.NamedSection, 'ss_rules', 'ss_rules');
		s.tab('general', _('General Settings'));
		s.tab('src', _('Source Settings'));
		s.tab('dst', _('Destination Settings'));

		s.taboption('general', form.Flag, 'disabled', _('Disable'));
		if (!stats[1]) {
			ss.option_install_package(s, 'general');
		}

		o = s.taboption('general', form.ListValue, 'redir_tcp',
			_('ss-redir for TCP'));
		ss.values_redir(o, 'tcp');
		o = s.taboption('general', form.ListValue, 'redir_udp',
			_('ss-redir for UDP'));
		ss.values_redir(o, 'udp');

		o = s.taboption('general', form.ListValue, 'local_default',
			_('Local-out default'),
			_('Default action for locally generated TCP packets'));
		ss.values_actions(o);
		o = s.taboption('general', widgets.DeviceSelect, 'ifnames',
			_('Ingress interfaces'),
			_('Only apply rules on packets from these network interfaces'));
		o.multiple = true;
		o.noaliases = true;
		o.noinactive = true;
		s.taboption('general', form.Value, 'ipt_args',
			_('Extra arguments'),
			_('Passes additional arguments to iptables. Use with care!'));

		src_dst_option(s, 'src', form.DynamicList, 'src_ips_bypass',
			_('Src ip/net bypass'),
			_('Bypass ss-redir for packets with src address in this list'));
		src_dst_option(s, 'src', form.DynamicList, 'src_ips_forward',
			_('Src ip/net forward'),
			_('Forward through ss-redir for packets with src address in this list'));
		src_dst_option(s, 'src', form.DynamicList, 'src_ips_checkdst',
			_('Src ip/net checkdst'),
			_('Continue to have dst address checked for packets with src address in this list'));
		o = s.taboption('src', form.ListValue, 'src_default',
			_('Src default'),
			_('Default action for packets whose src address do not match any of the src ip/net list'));
		ss.values_actions(o);

		src_dst_option(s, 'dst', form.DynamicList, 'dst_ips_bypass',
			_('Dst ip/net bypass'),
			_('Bypass ss-redir for packets with dst address in this list'));
		src_dst_option(s, 'dst', form.DynamicList, 'dst_ips_forward',
			_('Dst ip/net forward'),
			_('Forward through ss-redir for packets with dst address in this list'));

		var dir = '/etc/shadowsocks-libev';
		o = s.taboption('dst', form.FileUpload, 'dst_ips_bypass_file',
			_('Dst ip/net bypass file'),
			_('File containing ip/net for the purposes as with <em>Dst ip/net bypass</em>'));
		o.root_directory = dir;
		o = s.taboption('dst', form.FileUpload, 'dst_ips_forward_file',
			_('Dst ip/net forward file'),
			_('File containing ip/net for the purposes as with <em>Dst ip/net forward</em>'));
		o.root_directory = dir;
		o = s.taboption('dst', form.ListValue, 'dst_default',
			_('Dst default'),
			_('Default action for packets whose dst address do not match any of the dst ip list'));
		ss.values_actions(o);

		if (stats[0].type === 'file') {
			o = s.taboption('dst', form.Flag, 'dst_forward_recentrst');
		} else {
			uci.set(conf, 'ss_rules', 'dst_forward_recentrst', '0');
			o = s.taboption('dst', form.Button, '_install');
			o.inputtitle = _('Install package iptables-mod-conntrack-extra');
			o.inputstyle = 'apply';
			o.onclick = function() {
				window.open(L.url('admin/system/opkg') +
					'?query=iptables-mod-conntrack-extra', '_blank', 'noopener');
			}
		}
		o.title = _('Forward recentrst');
		o.description = _('Forward those packets whose dst have recently sent to us multiple tcp-rst');

		return m.render();
	},
});
