--[[
LuCI - Lua Configuration Interface

Copyright 2014 Steven Barth <steven@midlink.org>
Copyright 2014 Dave Taht <dave.taht@bufferbloat.net>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

$Id$
]]--

local wa = require "luci.tools.webadmin"
local fs = require "nixio.fs"
local net = require "luci.model.network".init()
local sys = require "luci.sys"
--local ifaces = net:get_interfaces()
local ifaces = sys.net:devices()
local path = "/usr/lib/sqm"
local run_path = "/tmp/run/sqm/available_qdiscs"

m = Map("sqm", translate("Smart Queue Management"),
	translate("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(TypedSection, "queue", translate("Queues"))
s:tab("tab_basic", translate("Basic Settings"))
s:tab("tab_qdisc", translate("Queue Discipline"))
s:tab("tab_linklayer", translate("Link Layer Adaptation"))
s.addremove = true -- set to true to allow adding SQM instances in the GUI
s.anonymous = true

-- BASIC
e = s:taboption("tab_basic", Flag, "enabled", translate("Enable this SQM instance."))
e.rmempty = false

-- sm: following jow's advise, be helpful to the user and enable
--     sqm's init script if even a single sm instance/interface
--     is enabled; this is unexpected in that the init script gets
--     enabled as soon as at least one sqm instance is enabled
--     and that state is saved, so it does not require "Save & Apply"
--     to effect the init scripts.
--     the implementation was inpired/lifted from 
--     https://github.com/openwrt/luci/blob/master/applications/luci-app-minidlna/luasrc/model/cbi/minidlna.lua
function e.write(self, section, value)
	if value == "1" then
		luci.sys.init.enable("sqm")
		m.message = translate("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.")
	end
	return Flag.write(self, section, value)
end
-- TODO: inform the user what we just did...


-- Add to physical interface list a hint of the correpsonding network names,
-- used to help users better select e.g. lan or wan interface.

n = s:taboption("tab_basic", ListValue, "interface", translate("Interface name"))
-- sm lifted from luci-app-wol, the original implementation failed to show pppoe-ge00 type interface names
for _, iface in ipairs(ifaces) do
	if not (iface == "lo" or iface:match("^ifb.*")) then
		local nets = net:get_interface(iface)
		nets = nets and nets:get_networks() or {}
		for k, v in pairs(nets) do
			nets[k] = nets[k].sid
		end
		nets = table.concat(nets, ",")
		n:value(iface, ((#nets > 0) and "%s (%s)" % {iface, nets} or iface))
	end
end
n.rmempty = false


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

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

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


verb = s:taboption("tab_basic", ListValue, "verbosity", translate("Verbosity of SQM's output into the system log."))
verb:value("0", "silent")
verb:value("1", "error")
verb:value("2", "warning")
verb:value("5", "info ("..translate("default")..")")
verb:value("8", "debug")
verb:value("10", "trace")
verb.default = "5"
verb.rmempty = true




-- QDISC

local val_qdisc_name = ""
c = s:taboption("tab_qdisc", ListValue, "qdisc", translate("Queuing disciplines useable on this system. After installing a new qdisc, you need to restart the router to see updates!"))
c:value("fq_codel", "fq_codel ("..translate("default")..")")

if fs.stat(run_path) then
	for file in fs.dir(run_path) do
		c:value( file )
	end
end
c.default = "fq_codel"
c.rmempty = false



local qos_desc = ""
sc = s:taboption("tab_qdisc", ListValue, "script", translate("Queue setup script"))
for file in fs.dir(path) do
	if string.find(file, ".qos$") and not fs.stat(path .. "/" .. file .. ".hidden") then
		sc:value(file)
		qos_desc = qos_desc .. "<p><b>" .. file .. ":</b><br />"
		fh = io.open(path .. "/" .. file .. ".help", "r")
		if fh then
			qos_desc = qos_desc .. fh:read("*a") .. "</p>"
		else
			qos_desc = qos_desc .. "No help text</p>"
		end
	end
end
sc.default = "simple.qos"
sc.rmempty = false
sc.description = qos_desc

ad = s:taboption("tab_qdisc", Flag, "qdisc_advanced", translate("Show and Use Advanced Configuration. Advanced options will only be used as long as this box is checked."))
ad.default = false
ad.rmempty = true

squash_dscp  = s:taboption("tab_qdisc", ListValue, "squash_dscp", translate("Squash DSCP on inbound packets (ingress):"))
squash_dscp:value("1", "SQUASH")
squash_dscp:value("0", "DO NOT SQUASH")
squash_dscp.default = "1"
squash_dscp.rmempty = true
squash_dscp:depends("qdisc_advanced", "1")

squash_ingress = s:taboption("tab_qdisc", ListValue, "squash_ingress", translate("Ignore DSCP on ingress:"))
squash_ingress:value("1", "Ignore")
squash_ingress:value("0", "Allow")
squash_ingress.default = "1"
squash_ingress.rmempty = true
squash_ingress:depends("qdisc_advanced", "1")

iecn = s:taboption("tab_qdisc", ListValue, "ingress_ecn", translate("Explicit congestion notification (ECN) status on inbound packets (ingress):"))
iecn:value("ECN", "ECN ("..translate("default")..")")
iecn:value("NOECN")
iecn.default = "ECN"
iecn.rmempty = true
iecn:depends("qdisc_advanced", "1")

eecn = s:taboption("tab_qdisc", ListValue, "egress_ecn", translate("Explicit congestion notification (ECN) status on outbound packets (egress)."))
eecn:value("NOECN", "NOECN ("..translate("default")..")")
eecn:value("ECN")
eecn.default = "NOECN"
eecn.rmempty = true
eecn:depends("qdisc_advanced", "1")

ad2 = s:taboption("tab_qdisc", Flag, "qdisc_really_really_advanced", translate("Show and Use Dangerous Configuration. Dangerous options will only be used as long as this box is checked."))
ad2.default = false
ad2.rmempty = true
ad2:depends("qdisc_advanced", "1")

ilim = s:taboption("tab_qdisc", Value, "ilimit", translate("Hard limit on ingress queues; leave empty for default."))
-- ilim.default = 1000
ilim.isnumber = true
ilim.datatype = "and(uinteger,min(0))"
ilim.rmempty = true
ilim:depends("qdisc_really_really_advanced", "1")

elim = s:taboption("tab_qdisc", Value, "elimit", translate("Hard limit on egress queues; leave empty for default."))
-- elim.default = 1000
elim.datatype = "and(uinteger,min(0))"
elim.rmempty = true
elim:depends("qdisc_really_really_advanced", "1")


itarg = s:taboption("tab_qdisc", Value, "itarget", translate("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."))
itarg.datatype = "string"
itarg.rmempty = true
itarg:depends("qdisc_really_really_advanced", "1")

etarg = s:taboption("tab_qdisc", Value, "etarget", translate("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."))
etarg.datatype = "string"
etarg.rmempty = true
etarg:depends("qdisc_really_really_advanced", "1")



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

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

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

po = s:taboption("tab_linklayer", Value, "overhead", translate("Per Packet Overhead (byte):"))
po.datatype = "and(integer,min(-1500))"
po.default = 0
po.isnumber = true
po.rmempty = true
po:depends("linklayer", "ethernet")
po:depends("linklayer", "atm")


adll = s:taboption("tab_linklayer", Flag, "linklayer_advanced", translate("Show Advanced Linklayer Options, (only needed if MTU > 1500). Advanced options will only be used as long as this box is checked."))
adll.rmempty = true
adll:depends("linklayer", "ethernet")
adll:depends("linklayer", "atm")

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

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

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

lla = s:taboption("tab_linklayer", ListValue, "linklayer_adaptation_mechanism", translate("Which linklayer adaptation mechanism to use; for testing only"))
lla:value("default", "default ("..translate("default")..")")
lla:value("cake")
lla:value("htb_private")
lla:value("tc_stab")
lla.default = "default"
lla.rmempty = true
lla:depends("linklayer_advanced", "1")

-- PRORITIES?

return m
