p = {}



-- carousel returns one of a list of image filenames

--

-- the index of the one chosen increments every 'switchsecs'

-- which is a parameter giving the number of seconds between switches

-- 3600 would switch every hour

-- 43200 would be every 12 hours

-- 86400 would be daily (the default)

--

-- The list of filenames is in a named submodule, so everyone can have their own list.

-- For Komodobish (the default), the module is [[Module:Carousel/Komodobish]].

-- For Serial Number 54129, the module is [[Module:Carousel/54129]].

-- See /info/en/?search=Special:PrefixIndex/Module:Carousel/

--

-- {{#invoke:carousel | main | name = name-of-datamodule | switchsecs = number-of-seconds }}

-- {{#invoke:carousel | main | name = 54129 | switchsecs = 10 }} for 10 sec switches using [[Module:Carousel/54129]]

-- {{#invoke:carousel | main }} for 24 hours between switches using the default data module

--



p.main = function(frame)

	-- get parameter switchsecs; if NaN or less than 1, set default

	local switchtime = tonumber(frame.args.switchsecs) or 86400

	if switchtime < 1 then switchtime = 86400 end



	-- get parameter dataname; if missing, use default

	local dataname = frame.args.name or mw.text.trim(frame.args1]) or ""

	if dataname == "" then dataname = "Komodobish" end



	-- there should be a named data module as a submodule

	local imgs = require("Module:Carousel/" .. dataname)

	local numimgs = #imgs



	-- 'now' increments by 1 every switchtime seconds

	local now = math.floor( os.time() / switchtime )



	-- set an index between 1 and number of images

	local idx = now % numimgs + 1

	return imgsidx

end



return p