-- Copyright 2010 Jo-Philipp Wich <jow@openwrt.org>
-- Copyright 2017 Dan Luedtke <mail@danrl.com>
-- Licensed to the public under the Apache License 2.0.

local fs = require "nixio.fs"
local ip = require "luci.ip"
local math = require "math"
local util = require "luci.util"
local tonumber, tostring, type, unpack, select = tonumber, tostring, type, unpack, select


module "luci.cbi.datatypes"


_M['or'] = function(v, ...)
	local i
	for i = 1, select('#', ...), 2 do
		local f = select(i, ...)
		local a = select(i+1, ...)
		if type(f) ~= "function" then
			if f == v then
				return true
			end
			i = i - 1
		elseif f(v, unpack(a)) then
			return true
		end
	end
	return false
end

_M['and'] = function(v, ...)
	local i
	for i = 1, select('#', ...), 2 do
		local f = select(i, ...)
		local a = select(i+1, ...)
		if type(f) ~= "function" then
			if f ~= v then
				return false
			end
			i = i - 1
		elseif not f(v, unpack(a)) then
			return false
		end
	end
	return true
end

function neg(v, ...)
	return _M['or'](v:gsub("^%s*!%s*", ""), ...)
end

function list(v, subvalidator, subargs)
	if type(subvalidator) ~= "function" then
		return false
	end
	local token
	for token in v:gmatch("%S+") do
		if not subvalidator(token, unpack(subargs)) then
			return false
		end
	end
	return true
end

function bool(val)
	if val == "1" or val == "yes" or val == "on" or val == "true" then
		return true
	elseif val == "0" or val == "no" or val == "off" or val == "false" then
		return true
	elseif val == "" or val == nil then
		return true
	end

	return false
end

function uinteger(val)
	local n = tonumber(val)
	if n ~= nil and math.floor(n) == n and n >= 0 then
		return true
	end

	return false
end

function integer(val)
	local n = tonumber(val)
	if n ~= nil and math.floor(n) == n then
		return true
	end

	return false
end

function ufloat(val)
	local n = tonumber(val)
	return ( n ~= nil and n >= 0 )
end

function float(val)
	return ( tonumber(val) ~= nil )
end

function ipaddr(val)
	return ip4addr(val) or ip6addr(val)
end

function ip4addr(val)
	if val then
		return ip.IPv4(val) and true or false
	end

	return false
end

function ip4prefix(val)
	val = tonumber(val)
	return ( val and val >= 0 and val <= 32 )
end

function ip6addr(val)
	if val then
		return ip.IPv6(val) and true or false
	end

	return false
end

function ip6prefix(val)
	val = tonumber(val)
	return ( val and val >= 0 and val <= 128 )
end

function cidr4(val)
	local ip, mask = val:match("^([^/]+)/([^/]+)$")

	return ip4addr(ip) and ip4prefix(mask)
end

function cidr6(val)
	local ip, mask = val:match("^([^/]+)/([^/]+)$")

	return ip6addr(ip) and ip6prefix(mask)
end

function ipnet4(val)
	local ip, mask = val:match("^([^/]+)/([^/]+)$")

	return ip4addr(ip) and ip4addr(mask)
end

function ipnet6(val)
	local ip, mask = val:match("^([^/]+)/([^/]+)$")

	return ip6addr(ip) and ip6addr(mask)
end

function ipmask(val)
	return ipmask4(val) or ipmask6(val)
end

function ipmask4(val)
	return cidr4(val) or ipnet4(val) or ip4addr(val)
end

function ipmask6(val)
	return cidr6(val) or ipnet6(val) or ip6addr(val)
end

function ip6hostid(val)
	if val == "eui64" or val == "random" then
		return true
	else
		local addr = ip.IPv6(val)
		if addr and addr:prefix() == 128 and addr:lower("::1:0:0:0:0") then
			return true
		end
	end

	return false
end

function port(val)
	val = tonumber(val)
	return ( val and val >= 0 and val <= 65535 )
end

function portrange(val)
	local p1, p2 = val:match("^(%d+)%-(%d+)$")
	if p1 and p2 and port(p1) and port(p2) then
		return true
	else
		return port(val)
	end
end

function macaddr(val)
	return ip.checkmac(val) and true or false
end

function hostname(val, strict)
	if val and (#val < 254) and (
	   val:match("^[a-zA-Z_]+$") or
	   (val:match("^[a-zA-Z0-9_][a-zA-Z0-9_%-%.]*[a-zA-Z0-9]$") and
	    val:match("[^0-9%.]"))
	) then
		return (not strict or not val:match("^_"))
	end
	return false
end

function host(val, ipv4only)
	return hostname(val) or ((ipv4only == 1) and ip4addr(val)) or ((not (ipv4only == 1)) and ipaddr(val))
end

function network(val)
	return uciname(val) or host(val)
end

function hostport(val, ipv4only)
	local h, p = val:match("^([^:]+):([^:]+)$")
	return not not (h and p and host(h, ipv4only) and port(p))
end

function ip4addrport(val, bracket)
	local h, p = val:match("^([^:]+):([^:]+)$")
	return (h and p and ip4addr(h) and port(p))
end

function ip4addrport(val)
	local h, p = val:match("^([^:]+):([^:]+)$")
	return (h and p and ip4addr(h) and port(p))
end

function ipaddrport(val, bracket)
	local h, p = val:match("^([^%[%]:]+):([^:]+)$")
	if (h and p and ip4addr(h) and port(p)) then
		return true
	elseif (bracket == 1) then
		h, p = val:match("^%[(.+)%]:([^:]+)$")
		if  (h and p and ip6addr(h) and port(p)) then
			return true
		end
	end
	h, p = val:match("^([^%[%]]+):([^:]+)$")
	return (h and p and ip6addr(h) and port(p))
end

function wpakey(val)
	if #val == 64 then
		return (val:match("^[a-fA-F0-9]+$") ~= nil)
	else
		return (#val >= 8) and (#val <= 63)
	end
end

function wepkey(val)
	if val:sub(1, 2) == "s:" then
		val = val:sub(3)
	end

	if (#val == 10) or (#val == 26) then
		return (val:match("^[a-fA-F0-9]+$") ~= nil)
	else
		return (#val == 5) or (#val == 13)
	end
end

function hexstring(val)
	if val then
		return (val:match("^[a-fA-F0-9]+$") ~= nil)
	end
	return false
end

function hex(val, maxbytes)
	maxbytes = tonumber(maxbytes)
	if val and maxbytes ~= nil then
		return ((val:match("^0x[a-fA-F0-9]+$") ~= nil) and (#val <= 2 + maxbytes * 2))
	end
	return false
end

function base64(val)
	if val then
		return (val:match("^[a-zA-Z0-9/+]+=?=?$") ~= nil) and (math.fmod(#val, 4) == 0)
	end
	return false
end

function string(val)
	return true		-- Everything qualifies as valid string
end

function directory(val, seen)
	local s = fs.stat(val)
	seen = seen or { }

	if s and not seen[s.ino] then
		seen[s.ino] = true
		if s.type == "dir" then
			return true
		elseif s.type == "lnk" then
			return directory( fs.readlink(val), seen )
		end
	end

	return false
end

function file(val, seen)
	local s = fs.stat(val)
	seen = seen or { }

	if s and not seen[s.ino] then
		seen[s.ino] = true
		if s.type == "reg" then
			return true
		elseif s.type == "lnk" then
			return file( fs.readlink(val), seen )
		end
	end

	return false
end

function device(val, seen)
	local s = fs.stat(val)
	seen = seen or { }

	if s and not seen[s.ino] then
		seen[s.ino] = true
		if s.type == "chr" or s.type == "blk" then
			return true
		elseif s.type == "lnk" then
			return device( fs.readlink(val), seen )
		end
	end

	return false
end

function uciname(val)
	return (val:match("^[a-zA-Z0-9_]+$") ~= nil)
end

function range(val, min, max)
	val = tonumber(val)
	min = tonumber(min)
	max = tonumber(max)

	if val ~= nil and min ~= nil and max ~= nil then
		return ((val >= min) and (val <= max))
	end

	return false
end

function min(val, min)
	val = tonumber(val)
	min = tonumber(min)

	if val ~= nil and min ~= nil then
		return (val >= min)
	end

	return false
end

function max(val, max)
	val = tonumber(val)
	max = tonumber(max)

	if val ~= nil and max ~= nil then
		return (val <= max)
	end

	return false
end

function rangelength(val, min, max)
	val = tostring(val)
	min = tonumber(min)
	max = tonumber(max)

	if val ~= nil and min ~= nil and max ~= nil then
		return ((#val >= min) and (#val <= max))
	end

	return false
end

function minlength(val, min)
	val = tostring(val)
	min = tonumber(min)

	if val ~= nil and min ~= nil then
		return (#val >= min)
	end

	return false
end

function maxlength(val, max)
	val = tostring(val)
	max = tonumber(max)

	if val ~= nil and max ~= nil then
		return (#val <= max)
	end

	return false
end

function phonedigit(val)
	return (val:match("^[0-9\*#!%.]+$") ~= nil)
end

function timehhmmss(val)
	return (val:match("^[0-6][0-9]:[0-6][0-9]:[0-6][0-9]$") ~= nil)
end

function dateyyyymmdd(val)
	if val ~= nil then
		yearstr, monthstr, daystr = val:match("^(%d%d%d%d)-(%d%d)-(%d%d)$")
		if (yearstr == nil) or (monthstr == nil) or (daystr == nil) then
			return false;
		end
		year = tonumber(yearstr)
		month = tonumber(monthstr)
		day = tonumber(daystr)
		if (year == nil) or (month == nil) or (day == nil) then
			return false;
		end

		local days_in_month = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }

		local function is_leap_year(year)
			return (year % 4 == 0) and ((year % 100 ~= 0) or (year % 400 == 0))
		end

		function get_days_in_month(month, year)
			if (month == 2) and is_leap_year(year) then
				return 29
			else
				return days_in_month[month]
			end
		end
		if (year < 2015) then
			return false
		end
		if ((month == 0) or (month > 12)) then
			return false
		end
		if ((day == 0) or (day > get_days_in_month(month, year))) then
			return false
		end
		return true
	end
	return false
end