--ComputerGuy101 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

p.converttemp = function(frame)
	cels = tonumber (frame.args.celsius) or 0
	fahr = (cels*9) / 5 + 32 or 0
	msg = cels .. " degrees Celsius is equal to " .. fahr .. " degrees Fahrenheit."
	if cels > 9 then
		msg = msg .. " It is warm."
	else
		msg = msg .. " It is cold."
	end	
	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
		out = out .. numb .. " times " .. i .. " equals " .. i*numb .. "<br>"
	end
	return out
end

function p.people(frame)
	local friends = {"Agnetha", "Betty", "Carlos", "Davinder", "Eloise", "Harry", "Albus", "William"}
	local msg = ""
	for i = 1, #friends do
		msg = msg .. "Hello " .. friends[i] .. "<br>"
	end
	return msg
end

function p.sent(frame)
	local txt = frame.args.text or ""
	local out = string.upper (string.sub(txt, 1, 1)) .. string.sub(txt, 2)
	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 code = frame.args.langcode
	local list = mw.language.getFallbacksFor( code )
	local out = ""
	for k, v in pairs(list) do
		out = out .. v .. "<br>"
	end
	return out
end

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

p.pginfo = function( frame )
	local txt = ""
	local title = frame.args.title or 0
	local ttlobj = mw.title.new( title ) 
	if ttlobj == nil then 
		txt = "No tile is given as input. Please check your code."
	else
		local whthr_exists = ttlobj.exists
		local whthr_redir = ttlobj.isRedirect
		if whthr_exists == true then
			if whthr_redir == true then
				txt = ttlobj.text .. " exists and it is a redirect"
			else 
				txt = ttlobj.text .. " exists and it is not a redirect"
			end                                                                                         
		else
			txt = ttlobj.text .. " does not exists and it is not a redirect"
		end
	end
	return txt
end

return p