Module:Infobox

local p = {}
local args = {}
local origArgs = {}
local root
local empty_row_categories = {}
local category_in_empty_row_pattern = '%[%[%s*[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]%s*:[^]]*]]'
local has_rows = false
local lists = {
	plainlist_t = {
		patterns = {
			'^plainlist$',
			'%splainlist$',
			'^plainlist%s',
			'%splainlist%s'
		},
		found = false,
		styles = 'Plainlist/styles.css'
	},
	hlist_t = {
		patterns = {
			'^hlist$',
			'%shlist$',
			'^hlist%s',
			'%shlist%s'
		},
		found = false,
		styles = 'Hlist/styles.css'
	}
}

local function has_list_class(args_to_check)
	for _, list in pairs(lists) do
		if not list.found then
			for _, arg in pairs(args_to_check) do
				for _, pattern in ipairs(list.patterns) do
					if mw.ustring.find(arg or '', pattern) then
						list.found = true
						break
					end
				end
				if list.found then break end
			end
		end
	end
end

local function fixChildBoxes(sval, tt)
	local function notempty( s ) return s and s:match( '%S' ) end
	
	if notempty(sval) then
		local marker = '<span class=special_infobox_marker>'
		local s = sval
		-- start moving templatestyles and categories inside of table rows
		local slast = ''
		while slast ~= s do
			slast = s
			s = mw.ustring.gsub(s, '(</[Tt][Rr]%s*>%s*)(%[%[%s*[Cc][Aa][Tt][Ee][Gg][Oo][Rr][Yy]%s*:[^]]*%]%])', '%2%1')
			s = mw.ustring.gsub(s, '(</[Tt][Rr]%s*>%s*)(\127[^\127]*UNIQ%-%-templatestyles%-%x+%-QINU[^\127]*\127)', '%2%1')
		end
		-- end moving templatestyles and categories inside of table rows
		s = mw.ustring.gsub(s, '(<%s*[Tt][Rr])', marker .. '%1')
		s = mw.ustring.gsub(s, '(</[Tt][Rr]%s*>)', '%1' .. marker)
		if s:match(marker) then
			s = mw.ustring.gsub(s, marker .. '%s*' .. marker, '')
			s = mw.ustring.gsub(s, '([\r\n]|-[^\r\n]*[\r\n])%s*' .. marker, '%1')
			s = mw.ustring.gsub(s, marker .. '%s*([\r\n]|-)', '%1')
			s = mw.ustring.gsub(s, '(</[Cc][Aa][Pp][Tt][Ii][Oo][Nn]%s*>%s*)' .. marker, '%1')
			s = mw.ustring.gsub(s, '(<%s*[Tt][Aa][Bb][Ll][Ee][^<>]*>%s*)' .. marker, '%1')
			s = mw.ustring.gsub(s, '^(%{|[^\r\n]*[\r\n]%s*)' .. marker, '%1')
			s = mw.ustring.gsub(s, '([\r\n]%{|[^\r\n]*[\r\n]%s*)' .. marker, '%1')
			s = mw.ustring.gsub(s, marker .. '(%s*</[Tt][Aa][Bb][Ll][Ee]%s*>)', '%1')
			s = mw.ustring.gsub(s, marker .. '(%s*\n|%})', '%1')
		end
		if s:match(marker) then
			local subcells = mw.text.split(s, marker)
			s = ''
			for k = 1, #subcells do
				if k == 1 then
					s = s .. subcells[k] .. '</' .. tt .. '></tr>'
				elseif k == #subcells then
					local rowstyle = ' style="display:none"'
					if notempty(subcells[k]) then rowstyle = ''	end
					s = s .. '<tr' .. rowstyle ..'><' .. tt .. ' colspan=2>\n' ..
						subcells[k]
				elseif notempty(subcells[k]) then
					if (k % 2) == 0 then
						s = s .. subcells[k]
					else
						s = s .. '<tr><' .. tt .. ' colspan=2>\n' ..
							subcells[k] .. '</' .. tt .. '></tr>'
					end
				end
			end
		end
		-- the next two lines add a newline at the end of lists for the PHP parser
		-- [[Special:Diff/849054481]]
		-- remove when [[:phab:T191516]] is fixed or OBE
		s = mw.ustring.gsub(s, '([\r\n][%*#;:][^\r\n]*)$', '%1\n')
		s = mw.ustring.gsub(s, '^([%*#;:][^\r\n]*)$', '%1\n')
		s = mw.ustring.gsub(s, '^([%*#;:])', '\n%1')
		s = mw.ustring.gsub(s, '^(%{%|)', '\n%1')
		return s
	else
		return sval
	end
end

-- Cleans empty tables
local function cleanInfobox()
	root = tostring(root)
	if has_rows == false then
		root = mw.ustring.gsub(root, '<table[^<>]*>%s*</table>', '')
	end
end

-- Returns the union of the values of two tables, as a sequence.
local function union(t1, t2)

	local vals = {}
	for k, v in pairs(t1) do
		vals[v] = true
	end
	for k, v in pairs(t2) do
		vals[v] = true
	end
	local ret = {}
	for k, v in pairs(vals) do
		table.insert(ret, k)
	end
	return ret
end

-- Returns a table containing the numbers of the arguments that exist
-- for the specified prefix. For example, if the prefix was 'data', and
-- 'data1', 'data2', and 'data5' exist, it would return {1, 2, 5}.
local function getArgNums(prefix)
	local nums = {}
	for k, v in pairs(args) do
		local num = tostring(k):match('^' .. prefix .. '([1-9]%d*)$')
		if num then table.insert(nums, tonumber(num)) end
	end
	table.sort(nums)
	return nums
end

-- Adds a row to the infobox, with either a header cell
-- or a label/data cell combination.
local function addRow(rowArgs)
	
	if rowArgs.header and rowArgs.header ~= '_BLANK_' then
		has_rows = true
		has_list_class({ rowArgs.rowclass, rowArgs.class, args.headerclass })
		
		root
			:tag('tr')
				:addClass(rowArgs.rowclass)
				:cssText(rowArgs.rowstyle)
				:tag('th')
					:attr('colspan', '2')
					:addClass('infobox-header')
					:addClass(rowArgs.class)
					:addClass(args.headerclass)
					-- @deprecated next; target .infobox-<name> .infobox-header
					:cssText(args.headerstyle)
					:cssText(rowArgs.rowcellstyle)
					:wikitext(fixChildBoxes(rowArgs.header, 'th'))
		if rowArgs.data then
			root:wikitext(
				'[[Category:Pages using infobox templates with ignored data cells]]'
			)
		end
	elseif rowArgs.data and rowArgs.data:gsub(category_in_empty_row_pattern, ''):match('^%S') then
		has_rows = true
		has_list_class({ rowArgs.rowclass, rowArgs.class })
		
		local row = root:tag('tr')
		row:addClass(rowArgs.rowclass)
		row:cssText(rowArgs.rowstyle)
		if rowArgs.label then
			row
				:tag('th')
					:attr('scope', 'row')
					:addClass('infobox-label')
					-- @deprecated next; target .infobox-<name> .infobox-label
					:cssText(args.labelstyle)
					:cssText(rowArgs.rowcellstyle)
					:wikitext(rowArgs.label)
					:done()
		end

		local dataCell = row:tag('td')
		dataCell
			:attr('colspan', not rowArgs.label and '2' or nil)
			:addClass(not rowArgs.label and 'infobox-full-data' or 'infobox-data')
			:addClass(rowArgs.class)
			-- @deprecated next; target .infobox-<name> .infobox(-full)-data
			:cssText(rowArgs.datastyle)
			:cssText(rowArgs.rowcellstyle)
			:wikitext(fixChildBoxes(rowArgs.data, 'td'))
	else
		table.insert(empty_row_categories, rowArgs.data or '')
	end
end

local function renderTitle()
	if not args.title then return end

	has_rows = true
	has_list_class({args.titleclass})
	
	root
		:tag('caption')
			:addClass('infobox-title')
			:addClass(args.titleclass)
			-- @deprecated next; target .infobox-<name> .infobox-title
			:cssText(args.titlestyle)
			:wikitext(args.title)
	
end

local function renderAboveRow()
	if not args.above then return end

	has_rows = true
	has_list_class({ args.aboveclass })
	
	root
		:tag('tr')
			:tag('th')
				:attr('colspan', '2')
				:addClass('infobox-above')
				:addClass(args.aboveclass)
				-- @deprecated next; target .infobox-<name> .infobox-above
				:cssText(args.abovestyle)
				:wikitext(fixChildBoxes(args.above,'th'))
end

local function renderBelowRow()
	if not args.below then return end

	has_rows = true
	has_list_class({ args.belowclass })
	
	root
		:tag('tr')
			:tag('td')
				:attr('colspan', '2')
				:addClass('infobox-below')
				:addClass(args.belowclass)
				-- @deprecated next; target .infobox-<name> .infobox-below
				:cssText(args.belowstyle)
				:wikitext(fixChildBoxes(args.below,'td'))
end

local function addSubheaderRow(subheaderArgs)
	if subheaderArgs.data and
		subheaderArgs.data:gsub(category_in_empty_row_pattern, ''):match('^%S') then
		has_rows = true
		has_list_class({ subheaderArgs.rowclass, subheaderArgs.class })
		
		local row = root:tag('tr')
		row:addClass(subheaderArgs.rowclass)

		local dataCell = row:tag('td')
		dataCell
			:attr('colspan', '2')
			:addClass('infobox-subheader')
			:addClass(subheaderArgs.class)
			:cssText(subheaderArgs.datastyle)
			:cssText(subheaderArgs.rowcellstyle)
			:wikitext(fixChildBoxes(subheaderArgs.data, 'td'))
	else
		table.insert(empty_row_categories, subheaderArgs.data or '')
	end
end

local function renderSubheaders()
	if args.subheader then
		args.subheader1 = args.subheader
	end
	if args.subheaderrowclass then
		args.subheaderrowclass1 = args.subheaderrowclass
	end
	local subheadernums = getArgNums('subheader')
	for k, num in ipairs(subheadernums) do
		addSubheaderRow({
			data = args['subheader' .. tostring(num)],
			-- @deprecated next; target .infobox-<name> .infobox-subheader
			datastyle = args.subheaderstyle,
			rowcellstyle = args['subheaderstyle' .. tostring(num)],
			class = args.subheaderclass,
			rowclass = args['subheaderrowclass' .. tostring(num)]
		})
	end
end

local function addImageRow(imageArgs)

	if imageArgs.data and
		imageArgs.data:gsub(category_in_empty_row_pattern, ''):match('^%S') then

		has_rows = true
		has_list_class({ imageArgs.rowclass, imageArgs.class })
		
		local row = root:tag('tr')
		row:addClass(imageArgs.rowclass)

		local dataCell = row:tag('td')
		dataCell
			:attr('colspan', '2')
			:addClass('infobox-image')
			:addClass(imageArgs.class)
			:cssText(imageArgs.datastyle)
			:wikitext(fixChildBoxes(imageArgs.data, 'td'))
	else
		table.insert(empty_row_categories, imageArgs.data or '')
	end
end

local function renderImages()
	if args.image then
		args.image1 = args.image
	end
	if args.caption then
		args.caption1 = args.caption
	end
	local imagenums = getArgNums('image')
	for k, num in ipairs(imagenums) do
		local caption = args['caption' .. tostring(num)]
		local data = mw.html.create():wikitext(args['image' .. tostring(num)])
		if caption then
			data
				:tag('div')
					:addClass('infobox-caption')
					-- @deprecated next; target .infobox-<name> .infobox-caption
					:cssText(args.captionstyle)
					:wikitext(caption)
		end
		addImageRow({
			data = tostring(data),
			-- @deprecated next; target .infobox-<name> .infobox-image
			datastyle = args.imagestyle,
			class = args.imageclass,
			rowclass = args['imagerowclass' .. tostring(num)]
		})
	end
end

-- When autoheaders are turned on, preprocesses the rows
local function preprocessRows()
	if not args.autoheaders then return end
	
	local rownums = union(getArgNums('header'), getArgNums('data'))
	table.sort(rownums)
	local lastheader
	for k, num in ipairs(rownums) do
		if args['header' .. tostring(num)] then
			if lastheader then
				args['header' .. tostring(lastheader)] = nil
			end
			lastheader = num
		elseif args['data' .. tostring(num)] and
			args['data' .. tostring(num)]:gsub(
				category_in_empty_row_pattern, ''
			):match('^%S') then
			local data = args['data' .. tostring(num)]
			if data:gsub(category_in_empty_row_pattern, ''):match('%S') then
				lastheader = nil
			end
		end
	end
	if lastheader then
		args['header' .. tostring(lastheader)] = nil
	end
end

-- Gets the union of the header and data argument numbers,
-- and renders them all in order
local function renderRows()

	local rownums = union(getArgNums('header'), getArgNums('data'))
	table.sort(rownums)
	for k, num in ipairs(rownums) do
		addRow({
			header = args['header' .. tostring(num)],
			label = args['label' .. tostring(num)],
			data = args['data' .. tostring(num)],
			datastyle = args.datastyle,
			class = args['class' .. tostring(num)],
			rowclass = args['rowclass' .. tostring(num)],
			-- @deprecated next; target .infobox-<name> rowclass
			rowstyle = args['rowstyle' .. tostring(num)],
			rowcellstyle = args['rowcellstyle' .. tostring(num)]
		})
	end
end

local function renderNavBar()
	if not args.name then return end

	has_rows = true
	root
		:tag('tr')
			:tag('td')
				:attr('colspan', '2')
				:addClass('infobox-navbar')
				:wikitext(require('Module:Navbar')._navbar{
					args.name,
					mini = 1,
				})
end

local function renderItalicTitle()
	local italicTitle = args['italic title'] and mw.ustring.lower(args['italic title'])
	if italicTitle == '' or italicTitle == 'force' or italicTitle == 'yes' then
		root:wikitext(require('Module:Italic title')._main({}))
	end
end

-- Categories in otherwise empty rows are collected in empty_row_categories.
-- This function adds them to the module output. It is not affected by
-- args.decat because this module should not prevent module-external categories
-- from rendering.
local function renderEmptyRowCategories()
	for _, s in ipairs(empty_row_categories) do
		root:wikitext(s)
	end
end

-- Render tracking categories. args.decat == turns off tracking categories.
local function renderTrackingCategories()
	if args.decat == 'yes' then return end
	if args.child == 'yes' then
		if args.title then
			root:wikitext(
				'[[Category:Pages using embedded infobox templates with the title parameter]]'
			)
		end
	elseif #(getArgNums('data')) == 0 and mw.title.getCurrentTitle().namespace == 0 then
		root:wikitext('[[Category:Articles using infobox templates with no data rows]]')
	end
end

--[=[
Loads the templatestyles for the infobox.

TODO: FINISH loading base templatestyles here rather than in
MediaWiki:Common.css. There are 4-5000 pages with 'raw' infobox tables.
See [[Mediawiki_talk:Common.css/to_do#Infobox]] and/or come help :).
When we do this we should clean up the inline CSS below too.
Will have to do some bizarre conversion category like with sidebar.

]=]
local function loadTemplateStyles()
	local frame = mw.getCurrentFrame()
	
	local hlist_templatestyles = ''
	if lists.hlist_t.found then
		hlist_templatestyles = frame:extensionTag{
			name = 'templatestyles', args = { src = lists.hlist_t.styles }
		}
	end
	
	local plainlist_templatestyles = ''
	if lists.plainlist_t.found then
		plainlist_templatestyles = frame:extensionTag{
			name = 'templatestyles', args = { src = lists.plainlist_t.styles }
		}
	end
	
	-- See function description
	local base_templatestyles = frame:extensionTag{
		name = 'templatestyles', args = { src = 'Module:Infobox/styles.css' }
	}

	local templatestyles = ''
	if args['templatestyles'] then
		templatestyles = frame:extensionTag{
			name = 'templatestyles', args = { src = args['templatestyles'] }
		}
	end
	
	local child_templatestyles = ''
	if args['child templatestyles'] then
		child_templatestyles = frame:extensionTag{
			name = 'templatestyles', args = { src = args['child templatestyles'] }
		}
	end
	
	local grandchild_templatestyles = ''
	if args['grandchild templatestyles'] then
		grandchild_templatestyles = frame:extensionTag{
			name = 'templatestyles', args = { src = args['grandchild templatestyles'] }
		}
	end
	
	return table.concat({
		-- hlist -> plainlist -> base is best-effort to preserve old Common.css ordering.
		-- this ordering is not a guarantee because the rows of interest invoking
		-- each class may not be on a specific page
		hlist_templatestyles,
		plainlist_templatestyles,
		base_templatestyles,
		templatestyles,
		child_templatestyles,
		grandchild_templatestyles
	})
end

-- common functions between the child and non child cases
local function structure_infobox_common()
	renderSubheaders()
	renderImages()
	preprocessRows()
	renderRows()
	renderBelowRow()
	renderNavBar()
	renderItalicTitle()
	renderEmptyRowCategories()
	renderTrackingCategories()
	cleanInfobox()
end

-- Specify the overall layout of the infobox, with special settings if the
-- infobox is used as a 'child' inside another infobox.
local function _infobox()
	if args.child ~= 'yes' then
		root = mw.html.create('table')

		root
			:addClass(args.subbox == 'yes' and 'infobox-subbox' or 'infobox')
			:addClass(args.bodyclass)
			-- @deprecated next; target .infobox-<name>
			:cssText(args.bodystyle)
		
		has_list_class({ args.bodyclass })

		renderTitle()
		renderAboveRow()
	else
		root = mw.html.create()

		root
			:wikitext(args.title)
	end
	structure_infobox_common()
	
	return loadTemplateStyles() .. root
end

-- If the argument exists and isn't blank, add it to the argument table.
-- Blank arguments are treated as nil to match the behaviour of ParserFunctions.
local function preprocessSingleArg(argName)
	if origArgs[argName] and origArgs[argName] ~= '' then
		args[argName] = origArgs[argName]
	end
end

-- Assign the parameters with the given prefixes to the args table, in order, in
-- batches of the step size specified. This is to prevent references etc. from
-- appearing in the wrong order. The prefixTable should be an array containing
-- tables, each of which has two possible fields, a "prefix" string and a
-- "depend" table. The function always parses parameters containing the "prefix"
-- string, but only parses parameters in the "depend" table if the prefix
-- parameter is present and non-blank.
local function preprocessArgs(prefixTable, step)
	if type(prefixTable) ~= 'table' then
		error("Non-table value detected for the prefix table", 2)
	end
	if type(step) ~= 'number' then
		error("Invalid step value detected", 2)
	end

	-- Get arguments without a number suffix, and check for bad input.
	for i,v in ipairs(prefixTable) do
		if type(v) ~= 'table' or type(v.prefix) ~= "string" or
			(v.depend and type(v.depend) ~= 'table') then
			error('Invalid input detected to preprocessArgs prefix table', 2)
		end
		preprocessSingleArg(v.prefix)
		-- Only parse the depend parameter if the prefix parameter is present
		-- and not blank.
		if args[v.prefix] and v.depend then
			for j, dependValue in ipairs(v.depend) do
				if type(dependValue) ~= 'string' then
					error('Invalid "depend" parameter value detected in preprocessArgs')
				end
				preprocessSingleArg(dependValue)
			end
		end
	end

	-- Get arguments with number suffixes.
	local a = 1 -- Counter variable.
	local moreArgumentsExist = true
	while moreArgumentsExist == true do
		moreArgumentsExist = false
		for i = a, a + step - 1 do
			for j,v in ipairs(prefixTable) do
				local prefixArgName = v.prefix .. tostring(i)
				if origArgs[prefixArgName] then
					-- Do another loop if any arguments are found, even blank ones.
					moreArgumentsExist = true
					preprocessSingleArg(prefixArgName)
				end
				-- Process the depend table if the prefix argument is present
				-- and not blank, or we are processing "prefix1" and "prefix" is
				-- present and not blank, and if the depend table is present.
				if v.depend and (args[prefixArgName] or (i == 1 and args[v.prefix])) then
					for j,dependValue in ipairs(v.depend) do
						local dependArgName = dependValue .. tostring(i)
						preprocessSingleArg(dependArgName)
					end
				end
			end
		end
		a = a + step
	end
end

-- Parse the data parameters in the same order that the old {{infobox}} did, so
-- that references etc. will display in the expected places. Parameters that
-- depend on another parameter are only processed if that parameter is present,
-- to avoid phantom references appearing in article reference lists.
local function parseDataParameters()

	preprocessSingleArg('autoheaders')
	preprocessSingleArg('child')
	preprocessSingleArg('bodyclass')
	preprocessSingleArg('subbox')
	preprocessSingleArg('bodystyle')
	preprocessSingleArg('title')
	preprocessSingleArg('titleclass')
	preprocessSingleArg('titlestyle')
	preprocessSingleArg('above')
	preprocessSingleArg('aboveclass')
	preprocessSingleArg('abovestyle')
	preprocessArgs({
		{prefix = 'subheader', depend = {'subheaderstyle', 'subheaderrowclass'}}
	}, 10)
	preprocessSingleArg('subheaderstyle')
	preprocessSingleArg('subheaderclass')
	preprocessArgs({
		{prefix = 'image', depend = {'caption', 'imagerowclass'}}
	}, 10)
	preprocessSingleArg('captionstyle')
	preprocessSingleArg('imagestyle')
	preprocessSingleArg('imageclass')
	preprocessArgs({
		{prefix = 'header'},
		{prefix = 'data', depend = {'label'}},
		{prefix = 'rowclass'},
		{prefix = 'rowstyle'},
		{prefix = 'rowcellstyle'},
		{prefix = 'class'}
	}, 50)
	preprocessSingleArg('headerclass')
	preprocessSingleArg('headerstyle')
	preprocessSingleArg('labelstyle')
	preprocessSingleArg('datastyle')
	preprocessSingleArg('below')
	preprocessSingleArg('belowclass')
	preprocessSingleArg('belowstyle')
	preprocessSingleArg('name')
	-- different behaviour for italics if blank or absent
	args['italic title'] = origArgs['italic title']
	preprocessSingleArg('decat')
	preprocessSingleArg('templatestyles')
	preprocessSingleArg('child templatestyles')
	preprocessSingleArg('grandchild templatestyles')
end

-- If called via #invoke, use the args passed into the invoking template.
-- Otherwise, for testing purposes, assume args are being passed directly in.
function p.infobox(frame)
	if frame == mw.getCurrentFrame() then
		origArgs = frame:getParent().args
	else
		origArgs = frame
	end
	
	parseDataParameters()
	
	return _infobox()
end

-- For calling via #invoke within a template
function p.infoboxTemplate(frame)
	origArgs = {}
	for k,v in pairs(frame.args) do origArgs[k] = mw.text.trim(v) end
	
	parseDataParameters()
	
	return _infobox()
end
return p
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