'use strict';
'require uci';
'require form';
'require network';

network.registerPatternVirtual(/^pptp-.+$/);

function write_keepalive(section_id, value) {
	var f_opt = this.map.lookupOption('_keepalive_failure', section_id),
	    i_opt = this.map.lookupOption('_keepalive_interval', section_id),
	    f = (f_opt != null) ? +f_opt[0].formvalue(section_id) : null,
	    i = (i_opt != null) ? +i_opt[0].formvalue(section_id) : null;

	if (f == null || f == '' || isNaN(f))
		f = 0;

	if (i == null || i == '' || isNaN(i) || i < 1)
		i = 1;

	if (f > 0)
		uci.set('network', section_id, 'keepalive', '%d %d'.format(f, i));
	else
		uci.unset('network', section_id, 'keepalive');
}

return network.registerProtocol('pptp', {
	getI18n: function() {
		return _('PPtP');
	},

	getIfname: function() {
		return this._ubus('l3_device') || 'pptp-%s'.format(this.sid);
	},

	getOpkgPackage: function() {
		return 'ppp-mod-pptp';
	},

	isFloating: function() {
		return true;
	},

	isVirtual: function() {
		return true;
	},

	getDevices: function() {
		return null;
	},

	containsDevice: function(ifname) {
		return (network.getIfnameOf(ifname) == this.getIfname());
	},

	renderFormOptions: function(s) {
		var dev = this.getL3Device() || this.getDevice(), o;

		o = s.taboption('general', form.Value, 'server', _('VPN Server'));
		o.datatype = 'host(0)';

		s.taboption('general', form.Value, 'username', _('PAP/CHAP username'));

		o = s.taboption('general', form.Value, 'password', _('PAP/CHAP password'));
		o.password = true;

		if (L.hasSystemFeature('ipv6')) {
			o = s.taboption('advanced', form.ListValue, 'ipv6', _('Obtain IPv6-Address'), _('Enable IPv6 negotiation on the PPP link'));
			o.value('auto', _('Automatic'));
			o.value('0', _('Disabled'));
			o.value('1', _('Manual'));
			o.default = 'auto';
		}

		o = s.taboption('advanced', form.Flag, 'defaultroute', _('Use default gateway'), _('If unchecked, no default route is configured'));
		o.default = o.enabled;

		o = s.taboption('advanced', form.Flag, 'peerdns', _('Use DNS servers advertised by peer'), _('If unchecked, the advertised DNS server addresses are ignored'));
		o.default = o.enabled;

		o = s.taboption('advanced', form.DynamicList, 'dns', _('Use custom DNS servers'));
		o.depends('peerdns', '0');
		o.datatype = 'ipaddr';
		o.cast     = 'string';

		o = s.taboption('advanced', form.Value, 'metric', _('Use gateway metric'));
		o.placeholder = '0';
		o.datatype    = 'uinteger';

		o = s.taboption('advanced', form.Value, '_keepalive_failure', _('LCP echo failure threshold'), _('Presume peer to be dead after given amount of LCP echo failures, use 0 to ignore failures'));
		o.placeholder = '0';
		o.datatype    = 'uinteger';
		o.write       = write_keepalive;
		o.remove      = write_keepalive;
		o.cfgvalue = function(section_id) {
			var v = uci.get('network', section_id, 'keepalive');
			if (typeof(v) == 'string' && v != '') {
				var m = v.match(/^(\d+)[ ,]\d+$/);
				return m ? m[1] : v;
			}
		};

		o = s.taboption('advanced', form.Value, '_keepalive_interval', _('LCP echo interval'), _('Send LCP echo requests at the given interval in seconds, only effective in conjunction with failure threshold'));
		o.placeholder = '5';
		o.datatype    = 'min(1)';
		o.write       = write_keepalive;
		o.remove      = write_keepalive;
		o.cfgvalue = function(section_id) {
			var v = uci.get('network', section_id, 'keepalive');
			if (typeof(v) == 'string' && v != '') {
				var m = v.match(/^\d+[ ,](\d+)$/);
				return m ? m[1] : v;
			}
		};

		o = s.taboption('advanced', form.Value, 'demand', _('Inactivity timeout'), _('Close inactive connection after the given amount of seconds, use 0 to persist connection'));
		o.placeholder = '0';
		o.datatype    = 'uinteger';

		o = s.taboption('advanced', form.Value, 'mtu', _('Override MTU'));
		o.placeholder = dev ? (dev.getMTU() || '1500') : '1500';
		o.datatype    = 'max(9200)';
	}
});