-- to enable us to replicate the current functioning of Country extract, we need to deal with:
-- 2 {{<name>}} DONE!
-- 3 [[<name>]] DONE!
-- 4 [[<name>|<junk>]] DONE!
-- 5 [[image:flag of <country>.[svg|gif|png|jpg]|\d+px]] DONE!

local p = {}
local getArgs = require("Module:Arguments").getArgs
local data = mw.loadData("Module:ISO 3166/data/National")

--[[----------C A T S----------]]--												-- Assign error categories
local function cats(cat, args)
	if not (args.nocat and args.nocat == 'true') and mw.title.getCurrentTitle().namespace == 0 then
		if cat == 'nocountry' then
			return '[[Category:Wikipedia articles with obscure country]]'
		elseif cat == 'nosubdivision' then
			return '[[Category:Wikipedia articles with obscure subdivision]]'
		end
	end
	return ''
end

--[[----------F I N D N A M E----------]]--										-- Finds the name in the database

local function findname(code,cdata,qry)
	local sqry = p.strip(qry)
	if cdata["name"] and sqry==p.strip(cdata["name"])
		or cdata["isoname"] and sqry==p.strip(cdata["isoname"])
		or not cdata["nocode"] and sqry==code
		or sqry==cdata["alpha3"] or sqry==cdata["numeric"]
		then
		return true
	end
	for _,tname in pairs(cdata["isonames"] or {}) do
		if sqry==p.strip(tname) then
			return true
		end
	end
	for _,tname in pairs(cdata["altnames"] or {}) do
		if sqry==p.strip(tname) then
			return true
		end
	end
	return false
end

--[[----------I S O N A M E----------]]--										-- Find the ISO name of a country/region

local function isoname(data,code,lang)
	if data[code]["isonames"] then
		local name = data[code]["isodisplaynames"] and data[code]["isodisplaynames"][lang]
			 or data[code]["isonames"][lang]
			 or data[code]["isodisplaynames"] and data[code]["isodisplaynames"][data[code]["defaultlang"] or data["defaultlang"]]
			 or data[code]["isonames"][data[code]["defaultlang"] or data["defaultlang"]]
			 or data[code]["isodisplaynames"] and data[code]["isodisplaynames"]["en"]
			 or data[code]["isonames"]["en"]
		if name then return name end
		for _,iname in pairs(data[code]["isonames"]) do return iname end
		return data[code]["isodisplayname"] or data[code]["isoname"]
	else
		return data[code]["isodisplayname"] or data[code]["isoname"]
	end
end

--[[----------S T R I P----------]]--											-- Removes junk from the input

function p.strip(text)
	if not text then return nil end
	
	local accents = {["À"]="A",["Á"]="A",["Â"]="A",["Ã"]="A",["Ä"]="A",
		["Å"]="A",["Æ"]="AE",["Ç"]="C",["È"]="E",["É"]="E",["Ê"]="E",["Ë"]="E",
		["Ì"]="I",["Í"]="I",["Î"]="I",["Ï"]="I",["Ð"]="D",["Ñ"]="N",["Ò"]="O",
		["Ó"]="O",["Ô"]="O",["Õ"]="O",["Ö"]="O",["Ø"]="O",["Ù"]="U",["Ú"]="U",
		["Û"]="U",["Ü"]="U",["Ý"]="Y",["Þ"]="TH",["Ā"]="A",["Ă"]="A",["Ą"]="A",
		["Ć"]="C",["Ĉ"]="C",["Ċ"]="C",["Č"]="C",["Ď"]="D",["Đ"]="D",["Ē"]="E",
		["Ĕ"]="E",["Ė"]="E",["Ę"]="E",["Ě"]="E",["Ĝ"]="G",["Ğ"]="G",["Ġ"]="G",
		["Ģ"]="G",["Ĥ"]="H",["Ħ"]="H",["Ĩ"]="I",["Ī"]="I",["Ĭ"]="I",["Į"]="I",
		["İ"]="I",["IJ"]="IJ",["Ĵ"]="J",["Ķ"]="K",["Ĺ"]="L",["Ļ"]="L",["Ľ"]="L",
		["Ŀ"]="L",["Ł"]="L",["Ń"]="N",["Ņ"]="N",["Ň"]="N",["Ŋ"]="N",["Ō"]="O",
		["Ŏ"]="O",["Ő"]="O",["Œ"]="OE",["Ŕ"]="R",["Ŗ"]="R",["Ř"]="R",["Ś"]="S",
		["Ŝ"]="S",["Ş"]="S",["Š"]="S",["Ţ"]="T",["Ť"]="T",["Ŧ"]="T",["Ũ"]="U",
		["Ū"]="U",["Ŭ"]="U",["Ů"]="U",["Ű"]="U",["Ų"]="U",["Ŵ"]="W",["Ŷ"]="Y",
		["Ÿ"]="Y",["Ź"]="Z",["Ż"]="Z",["Ž"]="Z",["Ɓ"]="B",["Ƃ"]="B",["Ɔ"]="C",
		["Ƈ"]="C",["Ɖ"]="D",["Ɗ"]="D",["Ƌ"]="D",["Ǝ"]="E",["Ə"]="E",["Ɛ"]="E",
		["Ƒ"]="F",["Ɠ"]="G",["Ɣ"]="G",["Ɩ"]="I",["Ɨ"]="I",["Ƙ"]="K",["Ɯ"]="M",
		["Ɲ"]="N",["Ɵ"]="O",["Ơ"]="O",["Ƣ"]="OI",["Ƥ"]="P",["Ʃ"]="SH",["Ƭ"]="T",
		["Ʈ"]="T",["Ư"]="U",["Ʊ"]="U",["Ʋ"]="V",["Ƴ"]="Y",["Ƶ"]="Z",["Ʒ"]="Z",
		["Ƹ"]="Z",["DŽ"]="DZ",["LJ"]="LJ",["NJ"]="NJ",["Ǎ"]="A",["Ǐ"]="I",
		["Ǒ"]="O",["Ǔ"]="U",["Ǖ"]="U",["Ǘ"]="U",["Ǚ"]="U",["Ǜ"]="U",["Ǟ"]="A",
		["Ǡ"]="A",["Ǣ"]="AE",["Ǥ"]="G",["Ǧ"]="G",["Ǩ"]="K",["Ǫ"]="O",["Ǭ"]="O",
		["Ǯ"]="Z",["DZ"]="DZ",["Ǵ"]="G",["Ƕ"]="HV",["Ƿ"]="W",["Ǹ"]="N",["Ǻ"]="A",
		["Ǽ"]="AE",["Ǿ"]="O",["Ȁ"]="A",["Ȃ"]="A",["Ȅ"]="E",["Ȇ"]="E",["Ȉ"]="I",
		["Ȋ"]="I",["Ȍ"]="O",["Ȏ"]="O",["Ȑ"]="R",["Ȓ"]="R",["Ȕ"]="U",["Ȗ"]="U",
		["Ș"]="S",["Ț"]="T",["Ȝ"]="Z",["Ȟ"]="H",["Ƞ"]="N",["Ȣ"]="OU",["Ȥ"]="Z",
		["Ȧ"]="A",["Ȩ"]="E",["Ȫ"]="O",["Ȭ"]="O",["Ȯ"]="O",["Ȱ"]="O",["Ȳ"]="Y",
		["Ⱥ"]="A",["Ȼ"]="C",["Ƚ"]="L",["Ⱦ"]="T",["Ƀ"]="B",["Ʉ"]="U",["Ʌ"]="V",
		["Ɇ"]="E",["Ɉ"]="J",["Ɋ"]="Q",["Ɍ"]="R",["Ɏ"]="Y",
	}
	local remove = {"NATION OF","COUNTRY OF","TERRITORY OF",					-- text to be removed list
		"FLAG OF","FLAG","KINGDOM OF","STATE OF"," STATE ",
		"PROVINCE OF","PROVINCE","TERRITORY","COUNTY","GOVERNORATE"
	}
	local patterns = {"(%a)%.(%a)%.",".+:","|.+","%(.-%)",						-- patterns to follow (order may matter)
		"%.%S.*","^THE ","%_","%-","%d%d?%d?PX"
	}
	local replacements = {["(%a)%.(%a)%."]="%1%2",								-- Replacements for patterns above (order does not matter)
		[".+:"]="",["|.+"]="",["%(.-%)"]="",									
		["%.%S.*"]="",["^THE "]="",["%_"]=" ",["%-"]=" ",
		["%d%d?%d?PX"]="",
	}
	
	text = mw.text.decode(text)                                                 -- Decode HTML entities (passed from wikidata?)
	text = mw.text.unstripNoWiki(text)											-- Remove <nowiki> tags
	text = mw.ustring.upper(text)												-- Case insensitivity
	text = mw.ustring.gsub(text,"[À-Ɏ]",accents)								-- Deaccent
	
	for _,pattern in ipairs(patterns) do										-- Follow patterns
		local value = replacements[pattern]
		text = mw.ustring.gsub(text,pattern,value) 
	end
	
	for _,words in pairs(remove) do												-- Remove unneeded words
	text = mw.ustring.gsub(text,words,"") 
	end
	
	text = mw.ustring.gsub(text,"%W","")										-- Remove non alpha-numeric
	
	return text
	
end

--[[----------P . C A L L S T R I P ---------]]--								-- Calls P.strip but using Module:Arguments

function p.callstrip(frame)
	
	local args = getArgs(frame)
	
	return p.strip(args[1]) or ""

end

--[[----------P . L U A C O D E---------]]--									-- Makes the ISO code of a country

function p.luacode(args)
	args[1], args[2] = args[1] or '', args[2] or ''
	local code1 = p.strip(args[1])
	local code2 = p.strip(args[2])

	if args["codetype"]=="3" then args["codetype"]="alpha3" end
	
	local eot = args.error or ""
	
	if code1 == "" then
		mw.addWarning((args[1] ~= "" and ('Invalid parameter "' .. args[1] .. '"') or 'No parameter') ..
			' for the country given ([[Module:ISO 3166]]).')
		return cats('nocountry', args), '<span style="font-size:100%" class="error">"No parameter for the country given"</span>'
	end

	local notRecognized ='%s ("%s") is not a recognized %s in [[ISO 3166-%s]] ([[Module:ISO 3166]]).'
	
	if code2 == "" then													--3166-1 code
		for alpha2,cdata in pairs(data) do
			if findname(alpha2,cdata,code1) then
				if args["codetype"]=="numeric" or args["codetype"]=="alpha3" then
					return cdata[args["codetype"]]
				else
					return alpha2
				end
			end
		end
		if string.find(args[1],"%-") then
			args[1], args[2] = string.match(args[1],"^([^%-]*)%-(.*)$")
			if args[2] then return p.luacode(args) end
		end
		mw.addWarning(string.format(notRecognized, code1, args[1], 'country', '1'))
		return cats('nocountry', args)
	else																		--3166-2 code
		for alpha2,cdata in pairs(data) do                                       
			if findname(alpha2,cdata,code1) then
				if mw.ustring.match(alpha2,"GB") then							-- For England, Wales etc.
					alpha2 = "GB"
				end
				local sdata = mw.loadData("Module:ISO 3166/data/"..alpha2)
				local empty = true
				for scode,scdata in pairs(sdata) do
					if type(scdata)=="table" then
						empty = false
						if findname(scode,scdata,code2) then
							return alpha2.."-"..scode
						end
					end
				end
				if string.find(args[2] or '',"%-") then
					code1, args[2] = string.match(args[2] or '',"^([^%-]*)%-(.*)$")
					args[1] = args[1].."-"..code1
					return p.luacode(args)
				end
				mw.addWarning(string.format(notRecognized, code2, args[2], 'subdivision', '2:' .. alpha2))
				return cats('nosubdivision', args)
			end
		end
		if string.find(args[1],"%-") then
			args[1] = string.match(args[1],"^([^%-]*)%-(.*)$")
			return p.luacode(args)
		end
		mw.addWarning(string.format(notRecognized, code1, args[1], 'country', '1'))
		return cats('nocountry', args)
	end
	mw.addWarning(string.format(notRecognized, code1, args[1], 'country', '1'))
	return cats('nocountry', args)
end

--[[----------P . C O D E---------]]--											-- Calls P.Luacode but using Module:Arguments

function p.code(frame)

	return p.luacode(getArgs(frame)) or ""

end

--[[----------P . N U M E R I C---------]]--									-- Calls P.Luacode but using Module:Arguments and setting it to output a numeric value

function p.numeric(frame)

	local args = getArgs(frame)
	
	args["codetype"]="numeric"
	
	return p.luacode(args) or ""
	
end
	
--[[----------P . L U A N A M E---------]]--									-- Makes the ISO/common name of a country
	
function p.luaname(args)

	local code1 = p.luacode(args)
	local code2 = ''
		
	if string.find(code1,"%-") then
		code1, code2 = string.match(code1,"^([^%-]*)%-(.*)$")
	end
	
	if string.find(code1,"^%u%u$") then
		if code2=="" then														--3166-1 alpha-2 code
			if data[code1] then
				return (args.isoname or args.lang) and isoname(data,code1,args.lang)
					or (data[code1]["displayname"] or data[code1]["name"])
			else
				return cats('nocountry', args)
			end
		else																	--3166-2 code
			local sdata
			if data[code1] then
				sdata = mw.loadData("Module:ISO 3166/data/"..code1)
			else
				return cats('nocountry', args)
			end
			if sdata[code2] then
				return (args.isoname or args.lang) and isoname(sdata,code2,args.lang)
					or (sdata[code2]["displayname"] or sdata[code2]["name"])
			else
				return cats('nocountry', args)
			end
		end
	elseif args.notfound then
		return args.notfound
	end
	
end

--[[----------P . N A M E---------]]--											-- Calls P.Luaname but using Module:Arguments

function p.name(frame)

	return p.luaname(getArgs(frame)) or ""

end
	
--[[----------P . G E O C O O R D I N S E R T---------]]--						-- Wrapper for Module:Coordinates.coordinsert
function p.geocoordinsert(frame)
	-- {{#invoke:ISO 3166|geocoordinsert|{{coord|...}}
	-- |country=..|subdivision1=...|subdivision2=...
	-- |type=...|scale=...|dim=...|source=...|globe=...
	-- }}
	local args = frame.args
	local subdivisionqueried = false
	local tracking = ''
	local targs = {}
	targs[1] = args[1] or ''
	for i, v in pairs(args) do
		if i == 'country' and not mw.ustring.find(targs[1], 'region:') then
			local country = v
			local k, region = 1, ''
			-- look for a valid subdivision
			while region == '' and k < 3 do
				local subdivision = args['subdivision' .. k] or ''
				if subdivision ~= '' then
					region = p.luacode({country, subdivision, nocat = 'true'})
					subdivisionqueried = true
				end
				k = k + 1
			end
			-- subdivision lookup failed or never attempted, try country only
			if region == '' then
				region = p.luacode({country, nocat = 'true'})
				if region == '' then
					tracking = tracking .. cats('nocountry', args)
				elseif subdivisionqueried == true then
					tracking = tracking .. cats('nosubdivision', args)
				end
			end
			-- something worked, add it to the targs
			if region ~= '' then
				targs[#targs + 1] = 'region:' .. region
			end
		elseif i == 'type' or i == 'scale' or i == 'dim' 
				or i == 'source' or i == 'globe' then
			targs[#targs + 1] = i .. ':' .. v
		end
	end
	-- call Module:Coordinates.coordinsert if there is something to insert
	if #targs > 1 then
		local coordinsert = require('Module:Coordinates').coordinsert
		return coordinsert({args = targs}) .. tracking
	end
	-- otherwise, just return the coordinates
	return targs[1] .. tracking
end

return p