'use strict';
'require fs';
'require ui';
'require rpc';
'require uci';
'require view';
'require form';
'require tools.widgets as widgets';

return view.extend({
	handleGetHelpText: function(script_name, tbl) {
		return fs.read("/usr/lib/sqm/" + script_name + ".help").then(function (text) {
			if (text)
				return [script_name, text];
		});
	},

	handleEnableSQM: rpc.declare({
		object: 'luci',
		method: 'setInitAction',
		params: [ 'sqm', 'enable' ],
		expect: { result: false }
	}),

	load: function() {
		return Promise.all([
			L.resolveDefault(fs.list('/var/run/sqm/available_qdiscs'), []),
			L.resolveDefault(fs.list('/usr/lib/sqm'), []).then(L.bind(function(scripts) {
				var tasks = [], scriptHelpTbl = {};

				for (var i = 0; i < scripts.length; i++)
					if (scripts[i].name.search(/\.qos$/) != -1)
						tasks.push(L.resolveDefault(this.handleGetHelpText(scripts[i].name, scriptHelpTbl), [scripts[i].name, null]));

				return Promise.all(tasks);
			}, this)),
			uci.load('sqm')
		]);
	},

	render: function(data) {
		var qdiscs = data[0],
		    scripts = data[1];

		if (qdiscs.length === 0) {
			ui.addNotification(null,
				E('div', { 'class': 'left' }, [
				E('p', _("The SQM service seems to be disabled. Please use the button below to activate this service.")),
				E('button', {
					'class': 'btn cbi-button-active',
					'click': ui.createHandlerFn(this, function() {
						return fs.exec('/etc/init.d/sqm', ['enable']).then(function() {
							return fs.exec('/etc/init.d/sqm', ['start']);
						}).then(function() {
							location.reload();
						});
					})
				}, _('Enable SQM'))
			]));
		}

		var m, s, o;

		m = new form.Map('sqm', _('Smart Queue Management'));
		m.description = _("With <abbr title=\"Smart Queue Management\">SQM</abbr> you " +
				  "can enable traffic shaping, better mixing (Fair Queueing)," +
				  " active queue length management (AQM) " +
				  " and prioritisation on one " +
				  "network interface.");

		s = m.section(form.TypedSection, 'queue', _('Queues'));
		s.tab("tab_basic", _("Basic Settings"));
		s.tab("tab_qdisc", _("Queue Discipline"));
		s.tab("tab_linklayer", _("Link Layer Adaptation"));
		s.anonymous = true;
		s.addremove = true;

		o = s.taboption("tab_basic", form.Flag, "enabled", _("Enable this SQM instance."));
		o.rmempty = false;
		o.write = L.bind(function(section, value) {
			if (value == "1") {
				this.handleEnableSQM();
				ui.addNotification(null, E('p', _("The SQM GUI has just enabled the sqm initscript on your behalf. Remember to disable the sqm initscript manually under System Startup menu in case this change was not wished for.")));
			}

			return uci.set("sqm", section, "enabled", value);
		}, this);

		o = s.taboption("tab_basic", widgets.DeviceSelect, "interface", _("Interface name"));
		o.rmempty = false;

		o = s.taboption("tab_basic", form.Value, "download", _("Download speed (kbit/s) (ingress) set to 0 to selectively disable ingress shaping:"));
		o.datatype = "and(uinteger,min(0))";
		o.rmempty = false;

		o = s.taboption("tab_basic", form.Value, "upload", _("Upload speed (kbit/s) (egress) set to 0 to selectively disable egress shaping:"));
		o.datatype = "and(uinteger,min(0))";
		o.rmempty = false;

		o = s.taboption("tab_basic", form.Flag, "debug_logging", _("Create log file for this SQM instance under /var/run/sqm/${Interface_name}.[start|stop]-sqm.log."));
		o.rmempty = false;

		o = s.taboption("tab_basic", form.ListValue, "verbosity", _("Verbosity of SQM's output into the system log."));
		o.value("0", "silent");
		o.value("1", "error");
		o.value("2", "warning");
		o.value("5", "info ("+_("default")+")");
		o.value("8", "debug");
		o.value("10", "trace");
		o.default = "5";

		o = s.taboption("tab_qdisc", form.ListValue, "qdisc", _("Queuing disciplines useable on this system. After installing a new qdisc, you need to restart the router to see updates!"));
		for (var i=0; i < qdiscs.length; i++) {
			o.value(qdiscs[i].name);
		}
		o.default = "cake";
		o.rmempty = false;

		var qos_desc = "";
		o = s.taboption("tab_qdisc", form.ListValue, "script", _("Queue setup script"));
		for (i = 0; i < scripts.length; i++) {
			o.value(scripts[i][0]);
			qos_desc +=  "<p><b>" + scripts[i][0] + ":</b><br />";
			if (scripts[i][1])
				qos_desc += scripts[i][1] + "</p>";
			else
				qos_desc += "No help text</p>";
		}
		o.default = "piece_of_cake.qos";
		o.rmempty = false;
		o.description = qos_desc;

		o = s.taboption("tab_qdisc", form.Flag, "qdisc_advanced", _("Show and Use Advanced Configuration. Advanced options will only be used as long as this box is checked."));
		o.default = false;

		o = s.taboption("tab_qdisc", form.ListValue, "squash_dscp", _("Squash DSCP on inbound packets (ingress):"));
		o.value("1", "SQUASH");
		o.value("0", "DO NOT SQUASH");
		o.default = "1";
		o.depends("qdisc_advanced", "1");

		o = s.taboption("tab_qdisc", form.ListValue, "squash_ingress", _("Ignore DSCP on ingress:"));
		o.value("1", "Ignore");
		o.value("0", "Allow");
		o.default = "1";
		o.depends("qdisc_advanced", "1");

		o = s.taboption("tab_qdisc", form.ListValue, "ingress_ecn", _("Explicit congestion notification (ECN) status on inbound packets (ingress):"));
		o.value("ECN", "ECN (" + _("default") + ")");
		o.value("NOECN");
		o.default = "ECN";
		o.depends("qdisc_advanced", "1");

		o = s.taboption("tab_qdisc", form.ListValue, "egress_ecn", _("Explicit congestion notification (ECN) status on outbound packets (egress)."));
		o.value("NOECN", "NOECN (" + _("default") + ")");
		o.value("ECN");
		o.default = "NOECN";
		o.depends("qdisc_advanced", "1");

		o = s.taboption("tab_qdisc", form.Flag, "qdisc_really_really_advanced", _("Show and Use Dangerous Configuration. Dangerous options will only be used as long as this box is checked."));
		o.default = false
		o.depends("qdisc_advanced", "1");

		o = s.taboption("tab_qdisc", form.Value, "ilimit", _("Hard limit on ingress queues; leave empty for default."));
		o.datatype = "and(uinteger,min(0))";
		o.depends("qdisc_really_really_advanced", "1");

		o = s.taboption("tab_qdisc", form.Value, "elimit", _("Hard limit on egress queues; leave empty for default."));
		o.datatype = "and(uinteger,min(0))";
		o.depends("qdisc_really_really_advanced", "1");

		o = s.taboption("tab_qdisc", form.Value, "itarget", _("Latency target for ingress, e.g 5ms [units: s, ms, or  us]; leave empty for automatic selection, put in the word default for the qdisc's default."));
		o.datatype = "string";
		o.depends("qdisc_really_really_advanced", "1");

		o = s.taboption("tab_qdisc", form.Value, "etarget", _("Latency target for egress, e.g. 5ms [units: s, ms, or  us]; leave empty for automatic selection, put in the word default for the qdisc's default."));
		o.datatype = "string";
		o.depends("qdisc_really_really_advanced", "1");

		o = s.taboption("tab_qdisc", form.Value, "iqdisc_opts", _("Advanced option string to pass to the ingress queueing disciplines; no error checking, use very carefully."));
		o.depends("qdisc_really_really_advanced", "1");

		o = s.taboption("tab_qdisc", form.Value, "eqdisc_opts", _("Advanced option string to pass to the egress queueing disciplines; no error checking, use very carefully."));
		o.depends("qdisc_really_really_advanced", "1");

		// LINKLAYER
		o = s.taboption("tab_linklayer", form.ListValue, "linklayer", _("Which link layer to account for:"));
		o.value("none", "none (" + _("default") + ")");
		o.value("ethernet", "Ethernet with overhead: select for e.g. VDSL2.");
		o.value("atm", "ATM: select for e.g. ADSL1, ADSL2, ADSL2+.");
		o.default = "none";

		o = s.taboption("tab_linklayer", form.Value, "overhead", _("Per Packet Overhead (byte):"));
		o.datatype = "and(integer,min(-1500))";
		o.default = 0
		o.depends("linklayer", "ethernet");
		o.depends("linklayer", "atm");

		o = s.taboption("tab_linklayer", form.Flag, "linklayer_advanced", _("Show Advanced Linklayer Options, (only needed if MTU > 1500). Advanced options will only be used as long as this box is checked."));
		o.depends("linklayer", "ethernet");
		o.depends("linklayer", "atm");

		o = s.taboption("tab_linklayer", form.Value, "tcMTU", _("Maximal Size for size and rate calculations, tcMTU (byte); needs to be >= interface MTU + overhead:"));
		o.datatype = "and(uinteger,min(0))";
		o.default = 2047
		o.depends("linklayer_advanced", "1");

		o = s.taboption("tab_linklayer", form.Value, "tcTSIZE", _("Number of entries in size/rate tables, TSIZE; for ATM choose TSIZE = (tcMTU + 1) / 16:"));
		o.datatype = "and(uinteger,min(0))";
		o.default = 128
		o.depends("linklayer_advanced", "1");

		o = s.taboption("tab_linklayer", form.Value, "tcMPU", _("Minimal packet size, MPU (byte); needs to be > 0 for ethernet size tables:"));
		o.datatype = "and(uinteger,min(0))";
		o.default = 0
		o.depends("linklayer_advanced", "1");

		o = s.taboption("tab_linklayer", form.ListValue, "linklayer_adaptation_mechanism", _("Which linklayer adaptation mechanism to use; for testing only"));
		o.value("default", "default (" + _("default") + ")");
		o.value("cake");
		o.value("htb_private");
		o.value("tc_stab");
		o.default = "default";
		o.depends("linklayer_advanced", "1");

		return m.render();
	}
})
