-- This module implements [[Template:Icon]].

require("strict")
local yesNo = require("Module:Yesno")
local getArgs = require("Module:Arguments").getArgs
local getPlain = nil

local p = {}

-- Determine whether we're being called from a sandbox
local sandbox = mw.getCurrentFrame():getTitle():find('sandbox', 1, true) and '/sandbox' or ''

-- Implements [[Template:Icon]]
-- Returns the icon image corresponding to a string (like 'B')
function p._main(args, data)
	local data_module = 'Module:Icon/data'..sandbox
	data = data or mw.loadData(data_module)
	local code = args.class or args[1]
	local iconData
	if code then
		code = code:match('^%s*(.-)%s*$'):lower() -- trim whitespace and put in lower case
		iconData = data[code]
	end
	if not iconData then
		iconData = data._DEFAULT
	end
	return string.format(
		'[[File:%s%s%s|%s|class=noviewer|alt=%s]]',
		iconData.image,
		iconData.tooltip and '|' .. iconData.tooltip or '',
		iconData.link == false and '|link=' or '',
		args.size or '16x16px',
		iconData.alt or ''
	)
end

-- Implements [[Template:Icon link]], a superset of [[Template:Icon]]
-- Returns an icon, plus a suitably formatted wikilink
function p._link(args, data)
	args.size = args.size or args.iconsize
	local icon = p._main(args, data)
	-- If no link given in args[2], default back to [[Template:Icon]]
	if not args[2] then
		return icon
	end
	-- Strip wiki markup out of link
	getPlain = getPlain or require("Module:Text").Text().getPlain
	local link = getPlain(args[2])
	local display = args[3] or args[2]
	-- italicize display string, if requested
	if yesNo(args.i) or yesNo(args.italic) or yesNo(args.italics) then
		display = '<i>'..display..'</i>'
	end
	-- if display is link, just use standard wlink
	if link == display then
		return icon..'&nbsp;[['..link..']]'
	end
	return icon..'&nbsp;[['..link..'|'..display..']]'
end

function p.main(frame)
	local args = getArgs(frame,{parentFirst=true})
	return p._main(args)
end

function p.link(frame)
	local args = getArgs(frame,{parentFirst=true})
	return p._link(args)
end

return p