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

var conf = 'shadowsocks-libev';
var cfgtypes = ['ss_rules'];

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.GridSection);
		s.addremove = true;
		s.addbtntitle = _('Add a new rule...');
		s.cfgsections = function() {
			return this.map.data.sections(this.map.config)
			    .filter(function(s) { return cfgtypes.indexOf(s['.type']) !== -1; })
			    .map(function(s) { return s['.name']; });
		};
		s.tab('general', _('General Settings'));
		s.tab('src', _('Source Settings'));
		s.tab('dst', _('Destination Settings'));
		s.sectiontype = 'ss_rules';
		
		s.addModalOptions = function(s, section_id, ev) {
			s.taboption('general', form.Flag, 'disabled', _('Disable'));
			s.taboption('general', form.Value, 'label', _('Label'));
			
			//o = s.taboption('general', form.ListValue, 'server', _('server'));
			//ss.values_serverlist(o, '');
			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);

			o = s.taboption('dst', form.Flag, 'dst_forward_recentrst');
			o.title = _('Forward recentrst');
			o.description = _('Forward those packets whose dst have recently sent to us multiple tcp-rst');
		};

		o = s.option(form.Button, 'disabled', _('Enable/Disable'));
		o.modalonly = false;
		o.editable = true;
		o.inputtitle = function(section_id) {
			var s = uci.get(conf, section_id);
			if (ss.ucival_to_bool(s['disabled'])) {
				this.inputstyle = 'reset';
				return _('Disabled');
			}
			this.inputstyle = 'save';
			return _('Enabled');
		};
		o.onclick = function(ev) {
			var inputEl = ev.target.parentElement.nextElementSibling;
			inputEl.value = ss.ucival_to_bool(inputEl.value) ? '0' : '1';
			return this.map.save();
		};
		return m.render();
	},
});