local p = {}

local debugging = false
local current_page =  mw.title.getCurrentTitle()

local sep = ", " -- separator for multiple values of same property, changed from "<br>"
local sep2 = "<br>" -- separator for values of different properties
local maxrefs = 3 -- maximum number of references displayed for each statement

-- Internationalisation

local currentlang = mw.language.getContentLanguage()

local i18n = {
	filespace = "File",
	editonwikidata = "Edit this on Wikidata",
	ordinal = {
		[1] = "st",
		[2] = "nd",
		[3] = "rd",
		["default"] = "th"
	},
}

local months = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" }
local mnths = {}
for idx, val in ipairs(months) do
	mnths[idx] = val:sub(1,3)
end

-- makeOrdinal needs to be internationalised along with the above i18n
-- takes cardinal number as a numeric and returns the ordinal as a string
-- we need three exceptions in English for 1st, 2nd, 3rd, 21st, .. 31st, etc.
-------------------------------------------------------------------------------
p.makeOrdinal = function(cardinal)
	local card = tonumber(cardinal)
	if not card then return cardinal end
	local ordsuffix = i18n.ordinal.default
	if card % 10 == 1 then
		ordsuffix = i18n.ordinal[1]
	elseif card % 10 == 2 then
		ordsuffix = i18n.ordinal[2]
	elseif card % 10 == 3 then
		ordsuffix = i18n.ordinal[3]
	end
	-- In English, 1, 21, 31, etc. use 'st', but 11, 111, etc. use 'th'
	-- similarly for 12 and 13, etc.
	if (card % 100 == 11) or (card % 100 == 12) or (card % 100 == 13) then
		ordsuffix = i18n.ordinal.default
	end
	return card .. ordsuffix
end

local unitsymbol = {
	Q218593 = "in",
	Q3710 = "ft",
	Q482798 = "yd",
	Q253276 = "mi",
	Q93318 = "nmi",
	Q11573 = "m",
	Q174728 = "cm",
	Q174789 = "mm",
	Q828224 = "km",
	Q81292 = "acres",
	Q35852 = "ha",
	Q712226 = "km2"
}

-- prefixes for particular qualifiers
local prefix = {
	P580 = "from ",
	P582 = "until ",
}

-- external ids which have a formatter url (P1630)
local formaturl = {
	P3563 = "https://wikidata-externalid-url.toolforge.org/?url=https%3A%2F%2Fmsi.nga.mil%2FqueryResults%3Fpublications%2Fngalol%2Flights-buoys%3Fvolume%3D%251%26featureNumber%3D%252%26includeRemovals%3Dfalse%26output%3Dhtml&exp=(%5Cd%7B3%7D)-(.*)&id=$1", -- NGA number
	P613 = "http://nearby.org.uk/coord.cgi?p=$1", -- OS grid reference
	P373 = "https://commons.wikimedia.org/wiki/Category:$1", -- Commons category
	P11235 = "http://damnet.or.jp/cgi-bin/binranA/enAll.cgi?db4=$1", -- Dams in Japan
	P11627 = "https://www.ibiblio.org/lighthouse/$1.htm", -- Lighthouse Directory
	P815 = "https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=$1" -- Integrated Taxonomic Information System
}

-- date format default to dmy
local df = "dmy"

-- fallbacks for common properties:
-- property-to-fallback-from = "property-to-fallback-to"
local fallback = {
	P276 = "P131",
	P571 = "P1619",
	P729 = "P1619",
	P4755 = "P296",
	P18 = "P8592"
}

local statedIDs = {
	Q36578 = {"GND", name=1},
	Q547473 = {"MacTutor", name="id"},
	Q19938912 = {"BNF", name=1},
	Q6973052 = {"National Heritage List for England", name="num"},
	Q19842847 = {"Historic Scotland listed building number", name=1}
}
-- error messages
local function errmsg(txt)
	if debugging then
		return "Error: " .. txt
	else
		return nil
	end
end

-- formats the first character of linked item to uppercase
local function ucf(lnk)
	local tbl = mw.text.split( lnk, "|", true )
	local ret
	if tbl[2] then -- piped link
		tbl[2] = tbl[2]:gsub("^(%l)", mw.ustring.upper)
		ret = table.concat(tbl, "|")
	elseif lnk:sub(1,2) == "[[" then -- unpiped link
		ret = lnk:gsub("^(%[%[%l)", mw.ustring.upper)
	else -- unlinked
		ret = lnk:gsub("^(%l)", mw.ustring.upper)
	end
	return ret
end
-- entrypoint for invoke
function p.ucf(frame)
	return ucf(frame.args.text or "")
end

-- return a number rounded to a precision
local function decimalprecision(x, prec)
	local s = 1
	if x < 0 then
		x = -x
		s = -1
	end
	-- if prec is not suplied, pick an arbitrary precision
	if not tonumber(prec) then prec = 1e-4
	elseif prec > 1 then prec = 1
	elseif prec < 1e-6 then prec = 1e-6
	else prec = 10 ^ math.floor(math.log10(prec))
	end
	x = math.floor(x / prec + 0.5) * prec * s
	-- if it's integral, cast to an integer:
	if  x == math.floor(x) then x = math.floor(x) end
	-- if it's less than 1e-4, it will be in exponent form, so return a string with 6dp
	-- 9e-5 becomes 0.000090
	if math.abs(x) < 1e-4 then x = string.format("%f", x) end
	return x
end

-- creates an icon that links to the relevant Wikidata entity
local function createicon(entityID, propertyID, langcode)
	langcode = langcode or ""
	if not entityID or entityID == "" then entityID= mw.wikibase.getEntityIdForCurrentPage() end
	propertyID = propertyID or ""
	local icon = "&nbsp;<span class='penicon autoconfirmed-show'>[["
	-- "&nbsp;<span data-bridge-edit-flow='overwrite' class='penicon'>[[" -> enable Wikidata Bridge
	.. i18n.filespace
	.. ":OOjs UI icon edit-ltr-progressive.svg |frameless |text-top |10px |alt="
	.. i18n.editonwikidata
	.. "|link=https://www.wikidata.org/wiki/" .. entityID
	if langcode ~= "" then icon = icon .. "?uselang=" .. langcode end
	if propertyID ~= "" then icon = icon .. "#" .. propertyID end
	icon = icon .. "|" .. i18n.editonwikidata .. "]]</span>"
	return icon
end

-- lookup nestedIndex in outer table
-- Example:  fetchNested(foo,{'bar','baz','quux'}) will return
--     foo.bar and foo.bar.baz and foo.bar.baz.quux
local function fetchNested(outer,nestedIndex)
    if not outer or type(outer) ~= 'table' or not nestedIndex or type(nestedIndex) ~= 'table' then
        return nil
    end
    local current = outer
    for _, indx in ipairs(nestedIndex) do
        current = current[indx]
        if not current then
            return current
        end
    end
    return current
end

-- takes a statement tuple supplied from Wikidata and returns any references
function p._getrefs(statement, qid)
	if not statement.references then return nil end
	local rtbl = {}
	local frm = mw.getCurrentFrame()
	for idx, ref in ipairs(statement.references) do
        local url = fetchNested(ref,{"snaks","P854",1,"datavalue","value"})
		if url then -- reference url
            local titleProp = fetchNested(ref,{"snaks","P1476"})
			if titleProp then -- title (monolingual text)
				local title
				for idx1, titles in ipairs(titleProp) do
					if fetchNested(titles,{"datavalue","value","language"}) == currentlang then
						title = fetchNested(titles,{"datavalue","value","text"})
						local website = ""
                        local rqid = fetchNested(ref,{"snaks","P248",1,"datavalue","value","id"})
						if rqid then
							local label = mw.wikibase.label(rqid,currentlang)
							if label then
								local sitelink = mw.wikibase.sitelink(rqid)
								if sitelink then
									website = "[[" .. sitelink .. "|" .. label .. "]]"
								else
									website = label
								end
							end
						end
						local citeweb = frm:expandTemplate{ title = "Cite web", args = { url=url, title=title, website=website} }
						local hash = "WD" .. mw.hash.hashValue("crc32", citeweb)
						rtbl[#rtbl+1] = frm:callParserFunction{ name = "#tag:ref", args = { citeweb, name=hash } }
						break
					end
				end
			else
				local bnf = url:match("https?://data.bnf.fr/ark:/12148/cb([0-9][a-Za-Z0-9]+)") or url:match("https?://catalogue.bnf.fr/ark:/12148/cb([0-9][a-Za-Z0-9]+)")
				if bnf then
					rtbl[#rtbl+1] = frm:callParserFunction{ name = "#tag:ref", args = { frm:expandTemplate{title="BNF",args={bnf}}, name="bnf"..bnf} }
				else
					local hash = "WD" .. mw.hash.hashValue("crc32", url)
					rtbl[#rtbl+1] = frm:callParserFunction{ name = "#tag:ref", args = { url, name=hash } }
				end
			end
		else
			local rqid = fetchNested(ref,{"snaks","P248",1,"datavalue","value","id"})
			if rqid and statedIDs[rqid] then
				local template = statedIDs[rqid]
				local propid = mw.wikibase.getBestStatements(rqid,"P1687")
				propid = fetchNested(propid,{1,"mainsnak","datavalue","value","id"})
                if propid then
				    for num, propdata in ipairs(mw.wikibase.getBestStatements(qid, propid)) do
					    local property = fetchNested(propdata,{"mainsnak","datavalue","value"})
					    local args = {[template.name] = property}
					    if rqid == "Q547473" then
						    args.title = mw.wikibase.label(qid)
					    end
					    local result = frm:expandTemplate{title=template[1],args=args}
					    rtbl[#rtbl+1] = frm:callParserFunction{ name = "#tag:ref", args = { result, name=qid .. propid .. num} }
				    end
                end
			elseif rqid then
				local citeq = frm:expandTemplate{ title = "Cite Q", args = { rqid } }
				rtbl[#rtbl+1] = frm:callParserFunction{ name = "#tag:ref", args = { citeq, name=rqid } }
			end
		end
		if #rtbl>=maxrefs then break end -- maximum number of references reached
	end
	return table.concat(rtbl)
end

-- takes a qid and attempts to return a linked name for it
-- otherwise an unlinked name; otherwise the qid
function p._getLink(qid, ShowRedLinks)
	local lbl, link = "", true
	local slink = mw.wikibase.sitelink(qid)
	local label = mw.wikibase.getLabel(qid)
	if slink and label then
		if slink:lower() == label:lower() then
			if label:find("^%u") then -- match label's case
				lbl = slink:gsub("^(%l)", mw.ustring.upper)
			else
				lbl = slink:gsub("^(%u)", mw.ustring.lower)
			end
		else
			lbl = slink .. "|" .. label
		end
	elseif slink then
		lbl = slink
	elseif label then
		lbl = label
		link = ShowRedLinks -- add link if ShowRedLinks set to true
	else
		lbl = qid
		link = false
	end
	return link and ('[[' .. lbl .. ']]') or lbl
end
-- entrypoint for #invoke getLink
function p.getLink(frame)
	local qid = (frame.args.qid or ""):upper()
	if qid == "" then return nil end
	local ShowRedLinks = frame.args.ShowRedLinks and true or false
	return p._getLink(qid, ShowRedLinks)
end

-- takes a snak for a time property and returns the date
local function _getDate(snak, prec)
	local retval
	retval = mw.wikibase.renderSnak(snak)
	if prec == 7 then -- century
		local num, txt = retval:match("^(%d+)%.(.+)$")
		retval = p.makeOrdinal(num) .. txt
	elseif prec == 10 then
		local m, y, e = retval:match("^(%a+) (%d+)(.*)")
		retval = m:sub(1,3) .. " " .. y .. e
	elseif prec == 11 then
		local d, m, y, e = retval:match("^(%d+) (%a+) (%d+)(.*)")
		retval = d .. " " .. m:sub(1,3) .. " " .. y .. e
	end
	return retval
end

-- takes a qid and a property id and returns the corresponding values or nil
-- maxvals greater than zero sets the maximum number of values to return
-- the string quals contains property ids of qualifiers to be returned ('-' is the separator)
function p._getWD(qid, pid, maxvals, quals, colunit)
	maxvals = maxvals or 0
	local ret = {}
	local sortkey
	for idx, prop in ipairs(mw.wikibase.getBestStatements(qid, pid)) do
		local retval
		if fetchNested(prop,{"mainsnak","snaktype"}) ~= "value" then
			break
		end
		local dtype = fetchNested(prop,{"mainsnak","datatype"})
		local dval = fetchNested(prop,{"mainsnak","datavalue","value"})
		if dtype == "wikibase-item" then
            retval = fetchNested(dval,{"id"}) 
			retval = retval and p._getLink(retval)
		elseif dtype == "monolingualtext" then
			retval = fetchNested(dval,{"text"})
		elseif dtype == "commonsMedia" or dtype == "url" then
			retval = dval
		elseif dtype == "external-id" or dtype == "string" then
            dval = dval or ""
			if formaturl[pid] then
				retval = "[" .. mw.ustring.gsub(formaturl[pid], "$1", dval) .. " " .. dval .. "]"
			else
				retval = dval
			end
		elseif dtype == "time" then
            local date = fetchNested(prop,{"mainsnak"})
            local precision = fetchNested(dval,{"precision"})
			retval = _getDate(date, precision)
			if precision == 11 and df == "mdy" then
				local d, m, y, e = retval:match("^(%d+) (%a+) (%d+)(.*)")
				retval = m .. " " .. d .. ", " .. y  .. e
			end
			if not sortkey then
				sortkey = fetchNested(prop,{"mainsnak","datavalue","value","time"})
			end
		elseif dtype == "quantity" then
			local amount = tonumber(fetchNested(dval,{"amount"}))
			local unit = string.match(fetchNested(dval,{"unit"}) or "", "(Q%d+)" )
			if unit then
				if unit == colunit then -- unit matches default for this column, so do not display unit
					retval = amount
				else
					if amount and unitsymbol[unit] then
						if colunit then -- attempt to convert to default unit
							local unit_label = mw.wikibase.label(unit) or unitsymbol[unit] or '???'
							local colunit_label = mw.wikibase.label(colunit) or unitsymbol[colunit] or '???'
							retval = mw.getCurrentFrame():expandTemplate{ title = "cvt", args = {
								amount,
								unitsymbol[unit],
								unitsymbol[colunit],
								disp='number'}
							} .. mw.getCurrentFrame():expandTemplate{
								title="efn",
								args = {
									name = string.format(
										'Converted%s%s',
										unitsymbol[unit],
										unitsymbol[colunit]
									),
									[1] = string.format(
										'Change in units: quantity in %s has been automatically converted to %s for uniformity.',
										unit_label,
										colunit_label
									)
								}
							}
						else -- show unit and default conversion
							retval = mw.getCurrentFrame():expandTemplate{ title = "cvt", args = {amount, unitsymbol[unit]} }
						end
					else
						retval = (amount or "")  .. " " .. mw.wikibase.getLabel(unit)
					end
				end
			else
				retval = amount
			end
		elseif dtype == "globe-coordinate" then
            local precision = fetchNested(dval,{"precision"})
			local lat = fetchNested(dval,{"latitude"})
            local long = fetchNested(dval,{"longitude"})
            lat = lat and decimalprecision(lat, precision)
            long = long and decimalprecision(long, precision)
			retval = "<span style='font-size:90%;'>"
			.. mw.wikibase.formatValue(fetchNested(prop,{"mainsnak"}))
			.. "</span>"
		else
			retval = dval
		end
		-- get references
		retval = (retval or "") .. (p._getrefs(prop, qid) or "")
		-- get qualifiers
		if quals and prop.qualifiers and retval then
			local qtbl = {}
			for qpid in quals:gmatch("P%d+") do
				if prop.qualifiers[qpid] then
					local qtbl2 = {}
					for i, qv in ipairs(prop.qualifiers[qpid]) do
						if qv.snaktype ~= "value" then break end
						local fqv
						if qv.datatype == "globe-coordinate" then
							fqv = mw.wikibase.formatValue(qv) -- linked
						elseif qv.datatype == "time" then
                            local precision = fetchNested(qv,{"datavalue","value","precision"})
							fqv = _getDate(qv, precision)
							if precision == 11 then -- trim to month
								fqv = fqv:match("%d+ (.+)")
							end
						else
							fqv = mw.wikibase.renderSnak(qv) -- plaintext
						end
						if fqv and fqv ~= "" then
							table.insert(qtbl2, (prefix[qpid] or "") .. fqv)
						end
					end
					table.insert(qtbl, table.concat(qtbl2, ' & ')) -- use ampersand to separate qualifiers of the same type
				end
			end
			if #qtbl > 0 then
				retval = retval .. "<span style='font-size:90%;'> (" .. table.concat(qtbl, ", ") .. ")</span>" -- use comma to separate qualifiers of different type
			end
		end
		ret[#ret+1] = retval
		if maxvals > 0 and #ret >= maxvals then break end
	end
	if #ret < 1 then
		return nil
	else
		return table.concat(ret, sep),sortkey
	end
end

-- entrypoint for #invoke getWD
function p.getWD(frame)
	local qid = (frame.args.qid or ""):upper()
	if qid == "" then return nil end
	local pid = (frame.args.pid or ""):upper()
	if pid == "" then return nil end
	local maxvals = tonumber(frame.args.maxvals) or 0
	local quals = (frame.args.quals or ""):upper()
	if quals == "" then quals = nil end
	return p._getWD(qid, pid, maxvals, quals)
end

-- make a single table row, one cell per value passed in args.pids
-- each value may be a combination of properties and qualifiers
function p._makerow(args)
	local qid = (args.qid or ""):upper():match("Q%d+")
	-- qid can be nil if we want a row without wikidata
	-- remove whitespace, uppercase, trap nil
	args.pids = (args.pids or ""):upper():gsub("%s", "")
	if args.pids == "" then return errmsg("missing pids") end
	local summary = (args.summary or "")
	local linecolor = (args.line or "")
	local linestyle = ''
	if linecolor ~= "" then
		linestyle = 'style="border-top:solid #' .. linecolor .. ';"'
	end
	local rows
	if summary == "" then rows=1 else rows=2 end
	local cols = 0
	-- collect any parameters c1, c2, etc. as cell replacements; c1+, c2+, etc. as addenda
	local cellrep, celladd = {}, {}
	for key, value in pairs(args) do
		local colr = (type(key) == "string") and tonumber(key:match("^[Cc](%d+)$"))
		if colr then
			cellrep[colr] = value
		end
		local cola = (type(key) == "string") and tonumber(key:match("^[Cc](%d+)%+$"))
		if cola then
			celladd[cola] = value
		end
	end
	if args.refname and args.refname ~= "" then
		local c1 = celladd[1] or ""
		celladd[1] = c1 .. mw.getCurrentFrame():extensionTag{name = 'ref', args = {name = args.refname}}
	end
	-- set date format if passed
	args.df = args.df or ""
	if args.df ~= "" then df = args.df end
	-- create the html to return
	local out = "<tr " .. linestyle .."><th scope='row' rowspan=" .. rows .. ">"
	if cellrep[1] and qid then
		out = out .. cellrep[1] .. createicon(qid) .. "</th>"
	elseif not qid then
		out = out .. (cellrep[1] or " ") .. "</th>"
	else
		out = out .. ucf(p._getLink(qid, args.ShowRedLinks and true or false)) .. (celladd[1] or "") .. createicon(qid) .. "</th>"
	end
	-- split args.pids at comma separators into sequence of cellpids (each may be like P12+P34/P456-P789)
	local cellpids = mw.text.split(args.pids, ",+")
	for c, val in ipairs(cellpids) do
		cols = cols+1
		if cellrep[c+1] then
			out = out .. '<td>' .. cellrep[c+1] .. '</td>'
		elseif not qid then
			out = out .. "<td></td>"
		elseif val=='SD' then
			local short_description = mw.wikibase.getDescription(qid)
			if short_description then
				short_description = currentlang:ucfirst(short_description)
			else
				local getShortDescription = require('Module:GetShortDescription' ).main
				local sdt = getShortDescription{name = mw.wikibase.sitelink(qid)}
				short_description = sdt.explicit or ''
			end
			out = out .. '<td style="text-align:center;">' .. short_description .. '</td>'
		else
			-- separate multiple properties in same cell, sep=+
			local ptbl = {} -- sequence of values for one cell
			local sortkeyf
			for propandquals in mw.text.gsplit(val, "+", true) do
				-- for each property, split off property from qualifiers, sep=/
				local pid = mw.text.split(propandquals, "/")[1]
				local unit = pid:match("%((Q%d+)%)") -- capture unit of quantity if specified
				pid = pid:match("P%d+")
				local quals = mw.text.split(propandquals, "/")[2]
				if pid == "P18" then -- image
					local img = p._getWD(qid, "P18", 1)
					if not img and fallback["P18"] then
						img = p._getWD(qid, fallback["P18"], 1)
					end
					if img then
						ptbl[#ptbl+1] = "[[File:" .. img .. "|100px]]"
					end
				else
					local wdval,sortkey = p._getWD(qid, pid, 0, quals, unit)
					if not wdval and fallback[pid] then
						wdval,sortkey = p._getWD(qid, fallback[pid], 0, quals, unit)
					end
					if not sortkeyf then
						sortkeyf = sortkey
					end
					ptbl[#ptbl+1] = wdval and ucf(wdval)
				end
			end -- of loop through multiple properties in same cell
			if sortkeyf then
					sortkeyf = 'data-sort-value="' .. mw.ustring.sub(sortkeyf,2) .. '"'
				else
					sortkeyf = ''
			end
			out = out .. '<td ' .. sortkeyf .. 'style="text-align:center;">' .. table.concat(ptbl, sep2) .. (celladd[c+1] or "") .. '</td>'
		end
	end -- of loop through all of the cells in the row
	out = out .. "</tr>"
	if summary ~= "" then
		out = out .. "<tr><td colspan=".. cols .. ">" .. summary .. "</td></tr>"
	end
	return out
end

-- entry point for #invoke makerow
function p.makerow(frame)
	local args = {}
	for key, value in pairs(frame:getParent().args) do
		args[key] = value
	end
	for key, value in pairs(frame.args) do
		args[key] = value
	end
	local isdoc
	if args.doc and args.doc=="no" then
		isdoc = false
	else
		isdoc = current_page:inNamespace(10)
	end
	if isdoc then
		args.qid = args.example
		return p.doc(args)
	else
		return p._makerow(args)
	end
end

function p.convert(frame)
	local args = frame.args
	local pargs = frame:getParent().args
	local input = args[1] or pargs[1]
	local template = args.template or pargs.template
	if input == nil then
		return nil
	end
	local resolveEntity = require( "Module:ResolveEntityId" )
	local articlelist = mw.text.split(input,"%*%s*")
	local qidlist = {}
	for i,article in ipairs(articlelist) do
		local rawarticle=string.match(article,'%[%[(.+)%|') or string.match(article,'%[%[(.+)%]%]')
		if rawarticle then
			local qid = resolveEntity._id(rawarticle)
	 		if qid then
				qidlist[#qidlist+1] = "{{" .. template .. "|qid=" .. qid.."<!-- "..rawarticle.." -->}}"
	 		else
	 			qidlist[#qidlist+1] = "{{" .. template .. "|qid=|c1="..rawarticle.."}}"
	 		end
		end
	end
	return table.concat(qidlist,"\n")
end

function p.convert2(frame)
	local args = frame.args
	local pargs = frame:getParent().args
	local input = args[1] or pargs[1]
	local template = args.template or pargs.template
	if input == nil then
		return nil
	end
	local qidlist = mw.text.split(input,"%*%s*")
	local out = ""
	for i,qid in ipairs(qidlist) do
		qid = mw.text.trim(qid)
		out = out .. "{{" .. template .. "|qid=" .. qid
		local label = mw.wikibase.getLabel(qid)
		if label then
			out = out .. "<!-- " .. label .. " -->"
		end
		out = out .. "}}\n"
	end
	return out
end

local function proplink(pid)
	local out
	if pid == "P1" then
		out = "Custom input"
	else
		out = mw.getCurrentFrame():expandTemplate{ title = 'Wikidata entity link', args = {pid} }
	end
	return out
end

function p.doc(args)
	local pids = args.pids
	local article = args.article
	local qid = args.qid
	local documentation = require('Module:Documentation').main
	pids = (pids or ""):upper():gsub("%s", "")
	if pids == "" then return errmsg("Missing PIDs") end
	local pidtable = {}
	for c1,val in ipairs(mw.text.split(pids, ",")) do
		pidtable[c1] = {}
		for c2,propandquals in ipairs(mw.text.split(val, "+")) do
			pidtable[c1][c2] = {}
			pidtable[c1][c2].property = mw.text.split(propandquals, "/")[1]
			pidtable[c1][c2].unit = pidtable[c1][c2].property:match("%((Q%d+)%)")
			if pidtable[c1][c2].property~='SD' then
				pidtable[c1][c2].property = pidtable[c1][c2].property:match("P%d+")
			end
			local quals = mw.text.split(propandquals, "/")[2]
			if quals then
				pidtable[c1][c2].quals = {}
				for qpid in quals:gmatch("P%d+") do
					pidtable[c1][c2].quals[1] = qpid
				end
			end
		end
	end
	local function unit(qid)
		if qid then
			local unit = mw.wikibase.sitelink(qid)
			if unit then
				unit = "[[" .. unit .. "|" .. unitsymbol[qid] .. "]]"
			else
				unit = unitsymbol[qid]
			end
			return " (in " .. unit .. ")"
		else
			return ""
		end
	end
	local base_page = current_page.subpageText=='sandbox' and current_page.basePageTitle.fullText or current_page.fullText
	local out = {'This template will retrieve certain data from [[Wikidata]] for use in a table in an article. '
		.. 'It is a wrapper template for [[Module:Wikidata table]] function <i>makerow</i>, using predefined properties.\n\n'
		.. (article and 'It was designed for use on [[' .. article .. ']] but may also be used on other articles. ([[Special:WhatLinksHere/' .. base_page .. '|Search]])\n' or '')
		.. '<h3>Usage</h3>'
		.. 'The data that is displayed in each column is as follows:<table class="wikitable"><tr>'
	}
	for c = 1,#pidtable+1 do
		table.insert(out, '<th>Column ' .. c .. '</th>')
	end
	table.insert(out, '</tr><tr><td>Label</td>')
	for c1 = 1,#pidtable do
		table.insert(out, '<td>')
		for c2 = 1,#pidtable[c1] do
			if pidtable[c1][c2].property=='SD' then
				table.insert(out, 'Short description')
			else
				table.insert(out, proplink(pidtable[c1][c2].property) .. unit(pidtable[c1][c2].unit))
				if pidtable[c1][c2].quals then
					table.insert(out, ' qualified by ')
					for c3 = 1,#pidtable[c1][c2].quals do
						table.insert(out, proplink(pidtable[c1][c2].quals[c3]))
					end
				end
			end
			table.insert(out, '<br>')
		end
		table.insert(out, '</td>')
	end
	table.insert(out, '</tr></table>')
	if qid then
		local sitelink = mw.wikibase.getSitelink(qid)
		table.insert(out, '<h3>Example</h3>The Wikidata QID for '
			.. (sitelink and '[['..sitelink..']]' or mw.wikibase.getLabel(qid))
			.. ' is [[:d:Special:EntityPage/' .. qid .. '|' .. qid .. ']]. Typing the following:<br>'
			.. '<code>{{' .. current_page.text .. '|qid=' .. qid .. '}}</code><br>produces'
			.. '<table class="wikitable"><tr><th>Name</th>'
		)
		for c = 1,#pidtable do
			local proplabel
			if pidtable[c][1].property == "P1" then
				proplabel = "Column " .. c+1
			elseif pidtable[c][1].property=='SD' then
				proplabel = 'Short description'
			else
				proplabel = currentlang:ucfirst(mw.wikibase.getLabel(pidtable[c][1].property)) .. unit(pidtable[c][1].unit)
			end
			table.insert(out, '<th>' .. proplabel .. '</th>')
		end
		table.insert(out, '</tr>' .. p._makerow(args) .. '</table>')
	end
	table.insert(out, '<h3>Notes</h3>\n'
		.. '* The table caption, column headings, etc. need to be added manually.\n'
		.. '* Please be careful about making changes to this template, as corresponding changes will need to be made to the column headings on '
	)
	table.insert(out,
		(article and '[['..article..']] and any other ' or 'any ')
		.. 'article using it. ([[Special:WhatLinksHere/' .. base_page .. '|Search]])\n'
		.. '<h3>Overriding columns</h3>'
		.. 'It is possible to override or append to data values obtained from Wikidata in any column in the table.\n'
		.. '* To completely override column <i>n</i> with some custom content, use parameter <code>cn=</code>\n'
		.. '*: For example, to replace column 5 with the number 1957 use <code>c5=1957</code>\n'
		.. '* To append some custom content to the end of column <i>n</i> use parameter <code>cn+=</code>\n'
		.. '*: For example, to add a footnote to column 6 use <code>c6+={{efn|This value is approximate.}}</code>\n'
		.. '<h3>Add named reference</h3>'
		.. 'If you [[Help:List-defined references|define references in a list]] then you can cite one of these by using the parameter <code>refname</code>. This will add a reference to column 1 directly after the label.\n'
		.. 'For example you can define a reference called Smith1 by using <pre><references>\n<ref name="Smith1">reference</ref>\n</references></pre>\n'
		.. "Then use <code>refname=Smith1</code>"
		.. (qid and '<h3>References</h3>'..mw.getCurrentFrame():expandTemplate{title='Reflist'} or '')
		.. (current_page.subpageText~='sandbox' and '[[Category:Wikidata table row templates|' .. current_page.subpageText .. ']]' or '')
		.. '<h3>TemplateData</h3>'
	)
	local td = '{"params": {"qid": {"label": "QID",	"description": "Enter the Wikidata QID, which is a number beginning with Q. You can also add the name of the item as an HTML comment.","example": "'
		.. 	(qid and qid..'<!-- '..mw.wikibase.getLabel(qid)..' -->' or 'Q1234567')
		.. '","type": "string","suggested": true}'
		.. ',"refname": {"label": "Add named reference","description": "Add a named reference defined in a list","type": "string","example": "ref1"}'
		.. ',"c1": {"label": "Override label","description": "Override the label (column 1) with this value","type": "content"}'
		.. ',"c1+": {"label": "Append to label","description": "Append this content to the label (column 1)","type": "content"}'
	for c = 1,#pidtable do
		if pidtable[c][1].property == "P1" then
			td = td .. ',"c' .. c+1 .. '": {"label": "Define column ' .. c+1 .. '","description": "Define column ' .. c+1 .. ' with this content","type": "content"}'
		elseif pidtable[c][1].property~='SD' then
			local label = mw.wikibase.getLabel(pidtable[c][1].property)
			td = td .. ',"c' .. c+1 .. '": {"label": "Override ' .. label .. '","description": "Override the ' .. label .. ' (column ' .. c+1 .. ') with this content","type": "content"}'
				.. ',"c' .. c+1 .. '+": {"label": "Append to ' .. label .. '","description": "Append this content to the ' .. label .. ' (column ' .. c+1 .. ')","type": "content"}'
		end
	end
	td = td .. '},"description": "This template reads some data from Wikidata while also allowing an editor to override or append their own content.","format": "inline"}'
	return documentation{content = table.concat(out) .. mw.getCurrentFrame():extensionTag{ name = 'templatedata', content = td}}
end

return p