-- Copyright 2017-2018 Dirk Brenken (dev@brenken.org)
-- This is free software, licensed under the Apache License, Version 2.0

local fs   = require("nixio.fs")
local uci  = require("luci.model.uci").cursor()
local util = require("luci.util")
local dump = util.ubus("network.interface", "dump", {})

m = Map("adblock", translate("Adblock"),
	translate("Configuration of the adblock package to block ad/abuse domains by using DNS. ")
	.. translatef("For further information "
	.. "<a href=\"%s\" target=\"_blank\">"
	.. "check the online documentation</a>", "https://github.com/openwrt/packages/blob/master/net/adblock/files/README.md"))

-- Main adblock options

s = m:section(NamedSection, "global", "adblock")

o1 = s:option(Flag, "adb_enabled", translate("Enable Adblock"))
o1.default = o1.disabled
o1.rmempty = false

o2 = s:option(ListValue, "adb_dns", translate("DNS Backend (DNS Directory)"),
	translate("List of supported DNS backends with their default list export directory. ")
	.. translate("To overwrite the default path use the 'DNS Directory' option in the extra section below."))
o2:value("dnsmasq", "dnsmasq (/tmp)")
o2:value("unbound", "unbound (/var/lib/unbound)")
o2:value("named", "named (/var/lib/bind)")
o2:value("kresd", "kresd (/etc/kresd)")
o2:value("dnscrypt-proxy","dnscrypt-proxy (/tmp)")
o2.default = "dnsmasq (/tmp)"
o2.rmempty = false

o3 = s:option(ListValue, "adb_fetchutil", translate("Download Utility"),
translate("List of supported and fully pre-configured download utilities."))
o3:value("uclient-fetch")
o3:value("wget")
o3:value("curl")
o3:value("aria2c")
o3:value("wget-nossl", "wget-nossl (noSSL)")
o3:value("busybox", "wget-busybox (noSSL)")
o3.default = "uclient-fetch"
o3.rmempty = false

o4 = s:option(ListValue, "adb_trigger", translate("Startup Trigger"),
	translate("List of available network interfaces. Usually the startup will be triggered by the 'wan' interface. ")
	.. translate("Choose 'none' to disable automatic startups, 'timed' to use a classic timeout (default 30 sec.) or select another trigger interface."))
o4:value("none")
o4:value("timed")
if dump then
	local i, v
	for i, v in ipairs(dump.interface) do
		if v.interface ~= "loopback" then
			o4:value(v.interface)
		end
	end
end
o4.rmempty = false

-- Runtime information

ds = s:option(DummyValue, "_dummy")
ds.template = "adblock/runtime"

-- Blocklist table

bl = m:section(TypedSection, "source", translate("Blocklist Sources"),
	translate("<b>Caution:</b> To prevent OOM exceptions on low memory devices with less than 64 MB free RAM, please only select a few of them!"))
bl.template = "adblock/blocklist"

name = bl:option(Flag, "enabled", translate("Enabled"))
name.rmempty = false

ssl = bl:option(DummyValue, "adb_src", translate("SSL req."))
function ssl.cfgvalue(self, section)
	local source = self.map:get(section, "adb_src")
	if source and source:match("https://") then
		return translate("Yes")
	else
		return translate("No")
	end
end

des = bl:option(DummyValue, "adb_src_desc", translate("Description"))

cat = bl:option(DynamicList, "adb_src_cat", translate("Archive Categories"))
cat.datatype = "uciname"
cat.optional = true

-- Extra options

e = m:section(NamedSection, "extra", "adblock", translate("Extra Options"),
	translate("Options for further tweaking in case the defaults are not suitable for you."))

e1 = e:option(Flag, "adb_debug", translate("Verbose Debug Logging"),
	translate("Enable verbose debug logging in case of any processing error."))
e1.default = e1.disabled
e1.rmempty = false

e2 = e:option(Flag, "adb_nice", translate("Low Priority Service"),
	translate("Set the nice level to 'low priority' and the adblock background processing will take less resources from the system. ")
	..translate("This change requires a manual service stop/re-start to take effect."))
e2.default = e2.disabled
e2.disabled = "0"
e2.enabled = "10"
e2.rmempty = false

e3 = e:option(Flag, "adb_forcedns", translate("Force Local DNS"),
	translate("Redirect all DNS queries from 'lan' zone to the local resolver, apply to udp and tcp protocol on ports 53, 853 and 5353."))
e3.default = e3.disabled
e3.rmempty = false

e4 = e:option(Flag, "adb_forcesrt", translate("Force Overall Sort"),
	translate("Enable memory intense overall sort / duplicate removal on low memory devices (&lt; 64 MB free RAM)"))
e4.default = e4.disabled
e4.rmempty = false

e5 = e:option(Flag, "adb_backup", translate("Enable Blocklist Backup"),
	translate("Create compressed blocklist backups, they will be used in case of download errors or during startup in backup mode."))
e5.default = e5.disabled
e5.rmempty = false

e6 = e:option(Value, "adb_backupdir", translate("Backup Directory"),
	translate("Target directory for adblock backups. Please use only non-volatile disks, e.g. an external usb stick."))
e6:depends("adb_backup", 1)
e6.datatype = "directory"
e6.default = "/mnt"
e5.rmempty = true

e7 = e:option(Flag, "adb_backup_mode", translate("Backup Mode"),
	translate("Do not automatically update blocklists during startup, use blocklist backups instead."))
e7:depends("adb_backup", 1)
e7.default = e7.disabled
e7.rmempty = true

e8 = e:option(Value, "adb_maxqueue", translate("Max. Download Queue"),
	translate("Size of the download queue to handle downloads &amp; list processing in parallel (default '4'). ")
	.. translate("For further performance improvements you can raise this value, e.g. '8' or '16' should be safe."))
e8.default = 4
e8.datatype = "range(1,32)"
e8.rmempty = false

e9 = e:option(Flag, "adb_jail", translate("'Jail' Blocklist Creation"),
	translate("Builds an additional 'Jail' list (/tmp/adb_list.jail) to block access to all domains except those listed in the whitelist file. ")
	.. translate("You can use this restrictive blocklist manually e.g. for guest wifi or kidsafe configurations."))
e9.default = e9.disabled
e9.rmempty = true

e9 = e:option(Flag, "adb_dnsflush", translate("Flush DNS Cache"),
	translate("Flush DNS Cache after adblock processing."))
e9.default = e9.disabled
e9.rmempty = true

e10 = e:option(Flag, "adb_notify", translate("Email Notification"),
	translate("Send notification emails in case of a processing error or if domain count is &le; 0. ")
	.. translate("Please note: this needs additional 'msmtp' package installation and setup."))
e10.default = e10.disabled
e10.rmempty = true

e11 = e:option(Value, "adb_notifycnt", translate("Email Notification Count"),
	translate("Raise the minimum email notification count, to get emails if the overall count is less or equal to the given limit (default 0), ")
	.. translate("e.g. to receive an email notification with every adblock update set this value to 150000."))
e11.default = 0
e11.datatype = "min(0)"
e11.optional = true

e12 = e:option(Value, "adb_dnsdir", translate("DNS Directory"),
	translate("Target directory for the generated blocklist 'adb_list.overall'."))
e12.datatype = "directory"
e12.optional = true

e13 = e:option(Value, "adb_whitelist", translate("Whitelist File"),
	translate("Full path to the whitelist file."))
e13.datatype = "file"
e13.default = "/etc/adblock/adblock.whitelist"
e13.optional = true

e14 = e:option(Value, "adb_triggerdelay", translate("Trigger Delay"),
	translate("Additional trigger delay in seconds before adblock processing begins."))
e14.datatype = "range(1,60)"
e14.optional = true

return m