local yesno = require('Module:Yesno')
local mList = require('Module:List')
local mTableTools = require('Module:TableTools')
local mMessageBox = require('Module:Message box')
local TNT = require('Module:TNT')

local p = {}

local function format(msg, ...)
	return TNT.format('I18n/Uses TemplateStyles', msg, ...)
end

local function getConfig()
	return mw.loadData('Module:Uses TemplateStyles/config')
end

local function makeEditSup(pageName)
	return string.format('<sup>&lbrack;[[Special:Edit/%s|e]]&rbrack;</sup>', pageName)
end

-- Build just the "(sandbox)" suffix using the i18n message, without duplicating the main link.
local function makeSandboxSuffix(tsSandboxPrefixed)
	-- i18n message is: "$1 ([[$2|sandbox]])"
	-- Passing empty $1 yields " ([[:...|sandbox]])" -> trim leading whitespace to get "(sandbox)" portion.
	local s = format('sandboxlink', '', ':' .. tsSandboxPrefixed)
	return (s:gsub('^%s+', ''))
end

local function renderBox(tStyles)
	local boxArgs = {
		type = 'notice',
		small = true,
		image = string.format('[[File:Farm-Fresh css add.svg|32px|alt=%s]]', format('logo-alt'))
	}

	if #tStyles < 1 then
		boxArgs.text = string.format('<strong class="error">%s</strong>', format('error-emptylist'))
	else
		local cfg = getConfig()
		local tStylesLinks = {}

		for i, ts in ipairs(tStyles) do
			local viewLink = string.format('[[:%s]]', ts)
			local editSup = makeEditSup(ts)

			local out = viewLink .. editSup

			-- Optional sandbox link + sandbox edit link
			local tsTitle = mw.title.new(ts)
			if tsTitle and cfg['sandbox_title'] then
				local tsSandboxTitle = mw.title.new(string.format(
					'%s:%s/%s/%s',
					tsTitle.nsText,
					tsTitle.baseText,
					cfg['sandbox_title'],
					tsTitle.subpageText
				))

				if tsSandboxTitle and tsSandboxTitle.exists then
					local sandboxSuffix = makeSandboxSuffix(tsSandboxTitle.prefixedText)
					local sandboxEditSup = makeEditSup(tsSandboxTitle.prefixedText)
					out = out .. ' ' .. sandboxSuffix .. ' ' .. sandboxEditSup
				end
			end

			tStylesLinks[i] = out
		end

		local tStylesList = mList.makeList('bulleted', tStylesLinks)
		boxArgs.text = format(
			mw.title.getCurrentTitle():inNamespaces(828, 829) and 'header-module' or 'header-template'
		) .. '\n' .. tStylesList
	end

	return mMessageBox.main('mbox', boxArgs)
end

local function renderTrackingCategories(args, tStyles, titleObj)
	if yesno(args.nocat) then
		return ''
	end

	local cfg = getConfig()
	local cats = {}

	-- Error category
	if #tStyles < 1 and cfg['error_category'] then
		cats[#cats + 1] = cfg['error_category']
	end

	-- TemplateStyles category
	titleObj = titleObj or mw.title.getCurrentTitle()
	if (titleObj.namespace == 10 or titleObj.namespace == 828)
		and not cfg['subpage_blacklist'][titleObj.subpageText]
	then
		local category = args.category or cfg['default_category']
		if category then
			cats[#cats + 1] = category
		end
		if not yesno(args.noprotcat) and (cfg['protection_conflict_category'] or cfg['padlock_pattern']) then
			local currentProt = titleObj.protectionLevels["edit"] and titleObj.protectionLevels["edit"][1] or nil
			local addedLevelCat = false
			local addedPadlockCat = false
			for _, ts in ipairs(tStyles) do
				local tsTitleObj = mw.title.new(ts)
				local tsProt = tsTitleObj.protectionLevels["edit"] and tsTitleObj.protectionLevels["edit"][1] or nil
				if cfg['padlock_pattern'] and tsProt and not addedPadlockCat then
					local content = tsTitleObj:getContent()
					if not content:find(cfg['padlock_pattern']) then
						cats[#cats + 1] = cfg['missing_padlock_category']
						addedPadlockCat = true
					end
				end
				if cfg['protection_conflict_category'] and currentProt and tsProt ~= currentProt and not addedLevelCat then
					currentProt = cfg['protection_hierarchy'][currentProt] or 0
					tsProt = cfg['protection_hierarchy'][tsProt] or 0
					if tsProt < currentProt then
						addedLevelCat = true
						cats[#cats + 1] = cfg['protection_conflict_category']
					end
				end
			end
		end
	end

	for i, cat in ipairs(cats) do
		cats[i] = string.format('[[Category:%s]]', cat)
	end
	return table.concat(cats)
end

function p._main(args)
	local cfg = getConfig()
	if #args == 0 then
		local prefixed = mw.title.getCurrentTitle().prefixedText
		prefixed = prefixed:gsub("/doc", "")
		args[1] = prefixed .. "/" .. cfg["default_subpage_name"]
	end
	local tStyles = mTableTools.compressSparseArray(args)
	local box = renderBox(tStyles)
	local trackingCategories = renderTrackingCategories(args, tStyles)
	return box .. trackingCategories
end

function p.main(frame)
	local origArgs = frame:getParent().args
	local args = {}
	for k, v in pairs(origArgs) do
		v = v:match('^%s*(.-)%s*$')
		if v ~= '' then
			args[k] = v
		end
	end
	return p._main(args)
end

return p