--Userring Google Code-in 2019, Introduction to Lua in Wikipedia
--Lua Task 2 - Working with modules

local p = {}

function p.hello( frame )
	return "Hello, world!"
end

p.Hi = function(frame)
	strName = frame.args.name or "Jimmy"
	return "Hello from Lua to my friend " .. strName .. ".<br>"
end

function p.converttemp(frame)
	cels = tonumber(frame.args.celsius) or 0
	fahr = ((cels * 9)/5) + 32
	msg = "".. cels .." degrees Celsius is ".. fahr .." in degrees Fahrenheit."
	if cels > 9 then
		msg2 = "It is warm."
	else 
		msg2 = "It is cold."
	end
	msg = msg .. msg2
	return msg
end

-- Task 4
function p.timestable(frame)
	local numb = tonumber( frame.args.numb ) or 2
	local out = numb .. " Times table<br>"
	for i = 1, 12 do
		currentout = i * numb
		currentmsg = numb .. " times by " .. i .. " equals " .. currentout
		out = out .. currentmsg .. "<br>"
	end
	return out
end

function p.people(frame)
	local friends = {"Agnetha", "Betty", "Carlos", "Davinder", "Eloise", "Name", "Namer", "Naming"}
	local msg = "The index iterating way:" .. "<br>"
	for i = 1, #friends do
		msg = msg .. "Hello " .. friends[i] .. "<br>"
	end
	msg = msg .. "<br>" .. "The ipairs() way: " .. "<br>"
	for i, friend in ipairs(friends) do 
		msg = msg .. "Hello " .. friends[i] .. "<br>"
	end
	return msg
end

function p.sent(frame)
	local txt = frame.args.text or ""
	local cap = string.upper(string.sub(txt, 1, 1))
	local uncap = string.sub(txt, 2)
	local out = cap .. uncap
	return out
end

function p.unpack(frame)
	local dmy = frame.args.dmydate or ""
	local d, m, y = string.match(dmy, "(%d+) (%w+) (%d+)")
	return "Year = " .. y .. "<br>Day = " .. d .. "<br>Month = " .. m
end

function p.langs(frame)
	local langslist = mw.language.fetchLanguageNames()
	local out = ""
	local count = 0
	for k, v in pairs(langslist) do
		out = out .. k .. " - " .. v .. "<br>"
		count = count + 1
	end
	return out .. "<br>= " .. count .. " languages"
end

function p.fallbacklangs(frame)
	local fallbacklangcode = frame.args.langcode
	local fallbacklanglist = mw.language.getFallbacksFor(fallbacklangcode)
	local fallbackout = ""
	for a, b in pairs(fallbacklanglist) do
		fallbackout = fallbackout .. a .." - " .. b .. "<br>"
	end
	return fallbackout
end

p.pgtitle = function( frame )
	local title = frame.args.title
	local ttlobj = mw.title.new( title )
	local txt = ttlobj.text
	return txt
end

function p.pginfo(frame)
	local title = frame.args.title or "User:Userring" 
	if title == nil or title == "" then
		title = "User:Userring"
	end
	local ttlobj = mw.title.new(title)
	if ttlobj == nil or ttlobj == "" then
		ttlobj = mw.title.new("User:Userring")
	end
	local txt = ttlobj.text
	local ex = ttlobj.exists
	local isr = ttlobj.isRedirect
	exout = " does not exist"
	isrout = " and is not a redirect"
	if ex == true then
		exout = " does exist"
	end
	if isr == true then
		isrout = " and is a redirect"
	end
	return txt .. exout .. isrout
end

-- Get date

function p.getdate(frame)
	local qid = frame.args.qid
	local prop = frame.args.prop
	local valtbl = mw.wikibase.getBestStatements(qid, prop)
	local timestamp = valtbl[1].mainsnak.datavalue.value.time
	timestamp = string.sub(timestamp, 2, 11)
	return timestamp
end

function p.getfulldate(frame)
	local qid = frame.args.qid
	local prop = frame.args.prop
	local monthname = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }
	local valtbl = mw.wikibase.getBestStatements(qid, prop)
	local timestamp = valtbl[1].mainsnak.datavalue.value.time
	timestamp = string.sub(timestamp, 2, 11)
	local year = string.sub(timestamp, 1, 4)
	local month = monthname[tonumber(string.sub(timestamp, 6, 7))]
	local day = string.sub(timestamp, 9, 10)
	return day .." ".. month .. " " .. year
end

function p.getitem(frame)
	local qid = frame.args.qid
	local prop = frame.args.prop
	local valtbl = mw.wikibase.getBestStatements(qid, prop)
	local id = valtbl[1].mainsnak.datavalue.value.id
	local id_in_words = mw.wikibase.getLabel(id)
	return id_in_words
end
return p