Module:Preview

-- <nowiki>
local p = {}
local ne = require('Module:Feature').isNotEmpty

function p.main(frame)
    local args = require('Module:Arguments').getArgs(frame, {
        parentFirst = true,
        wrappers = {'Template:Preview'}
    })
    return p._main(args)
end

function p._main(args)
	local result = mw.html.create():tag('div'):addClass('preview')
	if (args.class) then result:addClass(args.class) end
	
	local gallery = mw.html.create():tag('div'):addClass('preview-gallery caption-center')
	if (args.file or args.f or args.file1 or args.f1 or args[1]) then
		p.GalleryItem((args.file or args.f or args.file1 or args.f1 or args[1]), (args.caption or args.c or args.caption1 or args.c1 or args[2]), args.size, gallery)
		local y = 2
		while (args['file' .. tostring(y)] or args['f' .. tostring(y)]) do
			p.GalleryItem((args['file' .. tostring(y)] or args['f' .. tostring(y)]), (args['caption' .. tostring(y)] or args['c' .. tostring(y)]), args.size, gallery)
			y = y + 1
		end
		if args.notip then
			return result:node(gallery)
		else
			return result
				:tag('div'):addClass('hidden looppreview-hover-label')
					:tag('i'):wikitext('Hover over previews to view in higher quality.'):done()
					:done()
				:tag('div'):addClass('hidden looppreview-hover-preference')
					:tag('small'):wikitext('([[Special:Preferences#mw-prefsection-gadgets|Preview Preferences]])'):done()
					:done()
				:node(gallery)
		end
	else
		return result:tag('i'):wikitext('No preview available')
	end
end

function p.GalleryItem(file, caption, size, container)
	size = size or '380px'
	caption = caption or ''
	local attr = { ['data-size'] = size }
	local w, h = string.match(size, '^(%d+)x(%d+)px$')
	if w and h then
		attr = { ['data-width'] = w .. 'px', ['data-height'] = h .. 'px' }
	end
	
	container:tag('span'):addClass('preview-gallery-item'):tag('span'):addClass('looppreview')
		:tag('div'):addClass('video hidden mobileHide'):attr(attr)
			:wikitext('[[Media:',file,'.mp4]]')
			:done()
		:wikitext('[[File:', file, '.gif|', size, '|center|thumb|', caption, ']]')

	-- container reference is updated, no need to return.
end

return p