Module:Navbox/sandbox

local p = {}
local navbar = require('Module:Navbar')._navbar
local cfg = mw.loadData('Module:Navbox/configuration')
local getArgs -- lazily initialized
local args
local format = string.format

local function striped(wikitext, border)
	-- Return wikitext with markers replaced for odd/even striping.
	-- Child (subgroup) navboxes are flagged with a category that is removed
	-- by parent navboxes. The result is that the category shows all pages
	-- where a child navbox is not contained in a parent navbox.
	if border == cfg.keyword.border_subgroup and
		args[cfg.arg.orphan] ~= cfg.keyword.orphan_yes then
		-- No change; striping occurs in outermost navbox.
		return wikitext .. cfg.category.orphan
	end
	local first, second = 'odd', 'even'
	if args[cfg.arg.evenodd] then
		if args[cfg.arg.evenodd] == 'swap' then
			first, second = second, first
		else
			first = args[cfg.arg.evenodd]
			second = first
		end
	end
	local changer
	if first == second then
		changer = first
	else
		local index = 0
		changer = function (code)
			if code == '0' then
				-- Current occurrence is for a group before a nested table.
				-- Set it to first as a valid although pointless class.
				-- The next occurrence will be the first row after a title
				-- in a subgroup and will also be first.
				index = 0
				return first
			end
			index = index + 1
			return index % 2 == 1 and first or second
		end
	end
	local regex = cfg.category.orphan:gsub('([%[%]])', '%%%1')
	-- () omits gsub count
	return (wikitext:gsub(regex, ''):gsub(cfg.marker.regex, changer))
end

local function processItem(item, nowrapitems)
	if item:sub(1, 2) == '{|' then
		-- Applying nowrap to lines in a table does not make sense.
		-- Add newlines to compensate for trim of x in |parm=x in a template.
		return '\n' .. item ..'\n'
	end
	if nowrapitems == 'yes' then
		local lines = {}
		for line in (item .. '\n'):gmatch('([^\n]*)\n') do
			local prefix, content = line:match('^([*:;#]+)%s*(.*)')
			if prefix and not content:match('^<span class="nowrap">') then
				line = prefix .. '<span class="nowrap">' .. content .. '</span>'
			end
			table.insert(lines, line)
		end
		item = table.concat(lines, '\n')
	end
	if item:match('^[*:;#]') then
		return '\n' .. item ..'\n'
	end
	return item
end

local function renderNavBar(titleCell)
	if args[cfg.arg.navbar] ~= cfg.keyword.navbar_off and
		args[cfg.arg.navbar] ~= cfg.keyword.navbar_plain and
		(args[cfg.arg.name] or not mw.getCurrentFrame():getParent():getTitle():gsub('/sandbox$', '') == 'Template:Navbox') then
		titleCell:wikitext(navbar{
			args[cfg.arg.name],
			[cfg.navbar.mini] = 1,
			[cfg.navbar.fontstyle] = (args[cfg.arg.basestyle] or '') .. ';' ..
			(args[cfg.arg.titlestyle] or '') ..
			';background:none transparent;border:none;box-shadow:none;padding:0;'
		})
	end

end

local function renderTitleRow(tbl)
	if not args[cfg.arg.title] then return end

	local titleRow = tbl:tag('tr')

	if args[cfg.arg.titlegroup] then
		titleRow
			:tag('th')
				:attr('scope', 'row')
				:addClass('navbox-group')
				:addClass(args[cfg.arg.titlegroupclass])
				:cssText(args[cfg.arg.basestyle])
				:cssText(args[cfg.arg.groupstyle])
				:cssText(args[cfg.arg.titlegroupstyle])
				:wikitext(args[cfg.arg.titlegroup])
	end

	local titleCell = titleRow:tag('th'):attr('scope', 'col')

	if args[cfg.arg.titlegroup] then
		titleCell
			:css('border-left', '2px solid #fdfdfd')
			:css('width', '100%')
	end

	local titleColspan = 2
	if args[cfg.arg.imageleft] then titleColspan = titleColspan + 1 end
	if args[cfg.arg.image] then titleColspan = titleColspan + 1 end
	if args[cfg.arg.titlegroup] then titleColspan = titleColspan - 1 end

	titleCell
		:cssText(args[cfg.arg.basestyle])
		:cssText(args[cfg.arg.titlestyle])
		:addClass('navbox-title')
		:attr('colspan', titleColspan)

	renderNavBar(titleCell)

	titleCell
		:tag('div')
			-- id for aria-labelledby attribute
			:attr('id', mw.uri.anchorEncode(args[cfg.arg.title]))
			:addClass(args[cfg.arg.titleclass])
			:css('font-size', '114%')
			:css('margin', '0 4em')
			:wikitext(processItem(args[cfg.arg.title]))
end

local function getAboveBelowColspan()
	local ret = 2
	if args[cfg.arg.imageleft] then ret = ret + 1 end
	if args[cfg.arg.image] then ret = ret + 1 end
	return ret
end

local function renderAboveRow(tbl)
	if not args[cfg.arg.above] then return end

	tbl:tag('tr')
		:tag('td')
			:addClass('navbox-abovebelow')
			:addClass(args[cfg.arg.aboveclass])
			:cssText(args[cfg.arg.basestyle])
			:cssText(args[cfg.arg.abovestyle])
			:attr('colspan', getAboveBelowColspan())
			:tag('div')
				-- id for aria-labelledby attribute, if no title
				:attr('id', args[cfg.arg.title] and nil or mw.uri.anchorEncode(args[cfg.arg.above]))
				:wikitext(processItem(args[cfg.arg.above], args[cfg.arg.nowrapitems]))
end

local function renderBelowRow(tbl)
	if not args[cfg.arg.below] then return end

	tbl:tag('tr')
		:tag('td')
			:addClass('navbox-abovebelow')
			:addClass(args[cfg.arg.belowclass])
			:cssText(args[cfg.arg.basestyle])
			:cssText(args[cfg.arg.belowstyle])
			:attr('colspan', getAboveBelowColspan())
			:tag('div')
				:wikitext(processItem(args[cfg.arg.below], args[cfg.arg.nowrapitems]))
end

local function renderListRow(tbl, index, listnum, listnums_size)
	local row = tbl:tag('tr')

	if index == 1 and args[cfg.arg.imageleft] then
		row
			:tag('td')
				:addClass('noviewer')
				:addClass('navbox-image')
				:addClass(args[cfg.arg.imageclass])
				:css('width', '1px')               -- Minimize width
				:css('padding', '0 2px 0 0')
				:cssText(args[cfg.arg.imageleftstyle])
				:attr('rowspan', listnums_size)
				:tag('div')
					:wikitext(processItem(args[cfg.arg.imageleft]))
	end
	
	local group_and_num = format(cfg.arg.group_and_num, listnum)
	local groupstyle_and_num = format(cfg.arg.groupstyle_and_num, listnum)
	if args[group_and_num] then
		local groupCell = row:tag('th')

		-- id for aria-labelledby attribute, if lone group with no title or above
		if listnum == 1 and not (args[cfg.arg.title] or args[cfg.arg.above] or args[cfg.arg.group2]) then
			groupCell
				:attr('id', mw.uri.anchorEncode(args[cfg.arg.group1]))
		end

		groupCell
			:attr('scope', 'row')
			:addClass('navbox-group')
			:addClass(args[cfg.arg.groupclass])
			:cssText(args[cfg.arg.basestyle])
			-- If groupwidth not specified, minimize width
			:css('width', args[cfg.arg.groupwidth] or '1%')

		groupCell
			:cssText(args[cfg.arg.groupstyle])
			:cssText(args[groupstyle_and_num])
			:wikitext(args[group_and_num])
	end

	local listCell = row:tag('td')

	if args[group_and_num] then
		listCell
			:css('text-align', 'left')
			:css('border-left-width', '2px')
			:css('border-left-style', 'solid')
	else
		listCell:attr('colspan', 2)
	end

	if not args[cfg.arg.groupwidth] then
		listCell:css('width', '100%')
	end

	local rowstyle  -- usually nil so cssText(rowstyle) usually adds nothing
	if index % 2 == 1 then
		rowstyle = args[cfg.arg.oddstyle]
	else
		rowstyle = args[cfg.arg.evenstyle]
	end

	local list_and_num = format(cfg.arg.list_and_num, listnum)
	local liststyle_and_num = format(cfg.arg.liststyle_and_num, listnum)
	local listclass_and_num = format(cfg.arg.listclass_and_num, listnum)
	local listText = args[list_and_num]
	local oddEven = cfg.marker.oddeven
	if listText:sub(1, 12) == '</div><table' then
		-- Assume list text is for a subgroup navbox so no automatic striping for this row.
		oddEven = listText:find('<th[^>]*"navbox%-title"') and cfg.marker.restart or 'odd'
	end
	listCell
		:css('padding', '0')
		:cssText(args[cfg.arg.liststyle])
		:cssText(rowstyle)
		:cssText(args[liststyle_and_num])
		:addClass('navbox-list')
		:addClass('navbox-' .. oddEven)
		:addClass(args[cfg.arg.listclass])
		:addClass(args[listclass_and_num])
		:tag('div')
			:css('padding', (index == 1 and args[cfg.arg.list1padding]) or args[cfg.arg.listpadding] or '0 0.25em')
			:wikitext(processItem(listText, args[cfg.arg.nowrapitems]))

	if index == 1 and args[cfg.arg.image] then
		row
			:tag('td')
				:addClass('noviewer')
				:addClass('navbox-image')
				:addClass(args[cfg.arg.imageclass])
				:css('width', '1px') -- Minimize width
				:css('padding', '0 0 0 2px')
				:cssText(args[cfg.arg.imagestyle])
				:attr('rowspan', listnums_size)
				:tag('div')
					:wikitext(processItem(args[cfg.arg.image]))
	end
end

local function needsHorizontalLists(border)
	if border == cfg.keyword.border_subgroup or
		args[cfg.arg.tracking] == cfg.keyword.tracking_no then
		return false
	end
	return not (cfg.list_classes[args[cfg.arg.listclass]] or cfg.list_classes[args[cfg.arg.bodyclass]])
end

local function hasBackgroundColors()
	for _, key in ipairs({'titlestyle', 'groupstyle', 'basestyle', 'abovestyle', 'belowstyle'}) do
		if tostring(args[key]):find('background', 1, true) then
			return true
		end
	end
end

local function hasBorders()
	for _, key in ipairs({'groupstyle', 'basestyle', 'abovestyle', 'belowstyle'}) do
		if tostring(args[key]):find('border', 1, true) then
			return true
		end
	end
end

local function isIllegible()
	local styleratio = require('Module:Color contrast')._styleratio

	for key, style in pairs(args) do
		if tostring(key):match("style$") then
			if styleratio{mw.text.unstripNoWiki(style)} < 4.5 then
				return true
			end
		end
	end
	return false
end

local function getTrackingCategories(border)
	local cats = {}
	if needsHorizontalLists(border) then table.insert(cats, 'Navigational boxes without horizontal lists') end
	if hasBackgroundColors() then table.insert(cats, 'Navboxes using background colours') end
	if isIllegible() then table.insert(cats, 'Potentially illegible navboxes') end
	if hasBorders() then table.insert(cats, 'Navboxes using borders') end
	return cats
end

local function renderTrackingCategories(builder, border)
	local title = mw.title.getCurrentTitle()
	if title.namespace ~= 10 then return end -- not in template space
	local subpage = title.subpageText
	if subpage == 'doc' or subpage == 'sandbox' or subpage == 'testcases' then return end

	for _, cat in ipairs(getTrackingCategories(border)) do
		builder:wikitext('[[Category:' .. cat .. ']]')
	end
end

local function renderMainTable(border, listnums)
	local tbl = mw.html.create('table')
		:addClass('nowraplinks')
		:addClass(args[cfg.arg.bodyclass])

	if args[cfg.arg.title] and (args[cfg.arg.state] ~= 'plain' and args[cfg.arg.state] ~= 'off') then
		if args[cfg.arg.state] == 'collapsed' then args[cfg.arg.state] = 'mw-collapsed' end
		tbl
			:addClass('mw-collapsible')
			:addClass(args[cfg.arg.state] or 'autocollapse')
	end

	tbl:css('border-spacing', 0)
	if border == 'subgroup' or border == 'none' then
		tbl
			:addClass('navbox-subgroup')
			:cssText(args[cfg.arg.bodystyle])
			:cssText(args[cfg.arg.style])
	else  -- regular navbox - bodystyle and style will be applied to the wrapper table
		tbl
			:addClass('navbox-inner')
			:css('background', 'transparent')
			:css('color', 'inherit')
	end
	tbl:cssText(args[cfg.arg.innerstyle])

	renderTitleRow(tbl)
	renderAboveRow(tbl)
	local listnums_size = #listnums
	for i, listnum in ipairs(listnums) do
		renderListRow(tbl, i, listnum, listnums_size)
	end
	renderBelowRow(tbl)

	return tbl
end

function p._navbox(navboxArgs)
	args = navboxArgs
	local listnums = {}

	for k, _ in pairs(args) do
		if type(k) == 'string' then
			local listnum = k:match('^list(%d+)$')
			if listnum then table.insert(listnums, tonumber(listnum)) end
		end
	end
	table.sort(listnums)

	local border = mw.text.trim(args[cfg.arg.border] or args[1] or '')
	if border == 'child' then
		border = 'subgroup'
	end

	-- render the main body of the navbox
	local tbl = renderMainTable(border, listnums)

	-- render the appropriate wrapper around the navbox, depending on the border param
	local res = mw.html.create()
	if border == 'none' then
		local nav = res:tag('div')
			:attr('role', 'navigation')
			:node(tbl)
		-- aria-labelledby title, otherwise above, otherwise lone group
		if args[cfg.arg.title] or args[cfg.arg.above] or (args[cfg.arg.group1] and not args[cfg.arg.group2]) then
			nav:attr('aria-labelledby', mw.uri.anchorEncode(args[cfg.arg.title] or args[cfg.arg.above] or args[cfg.arg.group1]))
		else
			nav:attr('aria-label', 'Navbox')
		end
	elseif border == 'subgroup' then
		-- We assume that this navbox is being rendered in a list cell of a parent navbox, and is
		-- therefore inside a div with padding:0em 0.25em. We start with a </div> to avoid the
		-- padding being applied, and at the end add a <div> to balance out the parent's </div>
		res
			:wikitext('</div>')
			:node(tbl)
			:wikitext('<div>')
	else
		local nav = res:tag('div')
			:attr('role', 'navigation')
			:addClass('navbox')
			:addClass(args[cfg.arg.navboxclass])
			:cssText(args[cfg.arg.bodystyle])
			:cssText(args[cfg.arg.style])
			:css('padding', '3px')
			:node(tbl)
		-- aria-labelledby title, otherwise above, otherwise lone group
		if args[cfg.arg.title] or args[cfg.arg.above] or (args[cfg.arg.group1] and not args[cfg.arg.group2]) then
			nav:attr('aria-labelledby', mw.uri.anchorEncode(args[cfg.arg.title] or args[cfg.arg.above] or args[cfg.arg.group1]))
		else
			nav:attr('aria-label', 'Navbox')
		end
	end

	if (args[cfg.arg.nocat] or 'false'):lower() == 'false' then
		renderTrackingCategories(res, border)
	end
	return striped(tostring(res, border))
end

function p.navbox(frame)
	if not getArgs then
		getArgs = require('Module:Arguments').getArgs
	end
	args = getArgs(frame, {wrappers = {'Template:Navbox'}})

	-- Read the arguments in the order they'll be output in, to make references
	-- number in the right order.
	local _
	_ = args[cfg.arg.title]
	_ = args[cfg.arg.above]
	for i = 1, 20 do
		_ = args[format(cfg.arg.group_and_num, i)]
		_ = args[format(cfg.arg.list_and_num, i)]
	end
	_ = args[cfg.arg.below]

	return p._navbox(args)
end

return p