require('strict')
local p = {}
local frame = mw.getCurrentFrame()
local config_file = frame.args.config and frame.args.config~='' and ('/' .. frame.args.config) or ''
local config = mw.loadData('Module:Authority control/config' .. config_file)
local sandbox-- = '/' .. config.i18n.sandbox
local title = mw.title.getCurrentTitle()
local namespace = title.namespace
local testcases = title.subpageText == config.i18n.testcases
local makelink = require(config.i18n.ACmodule .. (sandbox or '')).makelink
local lang = mw.getContentLanguage()

local function needsAttention(sortkey)
	return '[[' .. config.i18n.category .. ':' .. config.i18n.attentioncat .. '|' .. sortkey .. title.text .. ']]'
end

local function addCat(cat, sortkey)
	if cat and cat ~= '' and (namespace == 0 or namespace == 14 or testcases) then
		local category, redlinkcat = '', ''
		if testcases == false and mw.title.new(cat, 14).exists == false then
			redlinkcat = needsAttention('N')
		end
		category = '[[' .. config.i18n.category .. ':' .. cat
		if sortkey then
			category = category .. '|' .. sortkey .. title.text
		end
		category = category .. ']]' .. redlinkcat
		return category
	else
		return ''
	end
end

local getstatement = function(id, propid, qualid)
	local statement = mw.wikibase.getBestStatements('P' .. id, 'P' .. propid)
	local value
	if statement and statement[1] and statement[1].mainsnak.datavalue and statement[1].mainsnak.datavalue.value.id then
		value = statement[1].mainsnak.datavalue.value.id
		local qual
		if qualid and statement[1].qualifiers['P' .. qualid][1].datavalue.value then
			qual = statement[1].qualifiers['P' .. qualid][1].datavalue.value
		end
		return value, qual
	end
end
local getname = function(property)
	local name
	for _, propnameqid in ipairs(config.property_items) do
		name = getstatement(property, propnameqid)
		if name then break end
	end
	if name then
		return frame:expandTemplate{
			title = 'Wikidata fallback link',
			args = {name}
		}
	else
		return ''
	end
end

-- Creates a human-readable standalone wikitable version of conf, and tracking categories with page counts, for use in the documentation
function p.docConfTable()
	local doc = ''
	local row = function(conf)
		local example_qid = getstatement(conf.property, 1855)
		local example = example_qid and frame:expandTemplate{
			title = 'Flatlist',
			args = {tostring(
				mw.html.create('ul')
				:node(makelink(conf, example_qid))
			)}
		} or ''
		local col1 = mw.html.create('th'):attr('data-sort-value', conf.property)
		if conf.remark then
			col1:attr('rowspan','2')
		end
		col1:wikitext(frame:expandTemplate{title = 'Wikidata property link', args = {conf.property}})
		local row = mw.html.create('tr')
			:node(col1)
			:tag('td'):wikitext(getname(conf.property)):done()
			:tag('td'):css('text-align', 'center'):wikitext(config.sections[conf.section].name):done()
			:tag('td'):wikitext(example):allDone()
		local remark
		if conf.remark then
			remark = mw.html.create('tr'):addClass('expand-child')
				:tag('td'):attr('colspan', '3')
					:tag('span'):css('font-weight', 'bold'):wikitext('ℹ️ '):done()
					:wikitext(frame:preprocess{text = conf.remark})
				:allDone()
		end
		return row, remark
	end
	local header_row = mw.html.create('tr')
		:tag('th'):attr('data-sort-type', 'number'):wikitext(config.i18n.WDproperty):done()
		:tag('th'):wikitext(lang:ucfirst(config.i18n.identifier)):done()
		:tag('th'):wikitext(config.i18n.Section):done()
		:tag('th'):wikitext(config.i18n.Appears_as):done()
	local doc = mw.html.create('table'):addClass('wikitable sortable'):node(header_row)
	for _, conf in pairs(config.config) do
		local row, remark = row(conf)
		doc:node(row):node(remark)
	end
	return tostring(doc)
end

function p.whitelisttable()
	local header = mw.html.create('tr')
		:tag('th'):wikitext(config.i18n.Code):done()
		:tag('th'):wikitext(config.i18n.Topic):done()
		:tag('th'):wikitext(lang:ucfirst(config.i18n.identifiers)):done()
	local Table = mw.html.create('table')
		:addClass('wikitable'):addClass('sortable')
		:node(header)
	for code, wlist in pairs(config.whitelists) do
		local plist = {}
		for _, property in pairs(wlist.properties) do
			table.insert(plist, frame:expandTemplate{title='Wikidata property link', args={'P' .. property}})
		end
		local row = mw.html.create('tr')
			:tag('th'):wikitext(code):done()
			:tag('td'):wikitext('[[' .. mw.wikibase.getSitelink('Q' .. wlist.topic) .. ']]'):done()
			:tag('td'):wikitext(table.concat(plist,', ')):done()
		Table:node(row)
	end
	return tostring(Table)
end

function p.sectiontable()
	local header = mw.html.create('tr')
		:tag('th'):wikitext(config.i18n.Section):done()
		:tag('th'):wikitext(config.i18n.Description):done()
		:tag('th'):wikitext(lang:ucfirst(config.i18n.identifiers)):done()
	local Table = mw.html.create('table')
		:addClass('wikitable'):addClass('sortable')
		:node(header)
	local plist = {}
	for n, _ in ipairs(config.sections) do
		plist[n] = {}
	end
	for _, id in pairs(config.config) do
		table.insert(plist[id.section], frame:expandTemplate{
			title=config.i18n.linktemplate,
			args={'P' .. id.property}
		})
	end
	for number, section in ipairs(config.sections) do
		local row = mw.html.create('tr')
			:tag('th'):wikitext(number):done()
			:tag('td'):wikitext(section.name):done()
			:tag('td'):wikitext(table.concat(plist[number],', ')):done()
		Table:node(row)
	end
	return tostring(Table)
end

function p.idproposal()
	local property = frame.args.property or ''
	local out = '<ul><li>Wikidata property: ' .. frame:expandTemplate{title='Wikidata property link', args={'P' .. property}} .. '</li>'
	out = out .. '<li>Section: '
	local section = frame.args.section or ''
	if section~='' then
		out = out .. config.sections[section].name .. ' (' .. section .. ')'
	else
		out = out .. 'Not specified'
	end
	out = out .. '</li><li>Link: '
	local link = frame.args.link or ''
	if link=='' then
		link = mw.wikibase.getBestStatements('P' .. property, 'P1630') or ''
		link = link[1].mainsnak.datavalue.value
	end	
	if link~='' then
		out = out .. '<code>' .. link .. '</code>'
	else
		out = out .. 'Not specified'
	end
	out = out .. '</li><li>Label: '
	local label = frame.args.label or ''
	if label~='' then
		out = out .. label
	else
		out = out .. 'Not specified'
	end
	out = out .. '</li><li>Example: '
	local example = mw.wikibase.getBestStatements('P'..property,'P1855') or ''
	if example then
		example = example[1].qualifiers['P'..property][1].datavalue.value
		example = frame:expandTemplate{title = 'Hlist', args = {makelink({[1]='', link=link, label=label}, example)}}
		out = out .. example
	else
		out = out .. 'Not available'
	end
	out = out .. '</li></ul>'
	return out
end

return p