Module:DailyFeatured

---

local p = {}

local function getPool()
	local content = mw.getCurrentFrame():expandTemplate{ title = "Featured pool" }
	local pages = {}

	for line in mw.text.gsplit(content or "", "\n", true) do
		line = mw.text.trim(line)
		line = line:gsub("<!%-%-.-%-%->", "")
		line = mw.text.trim(line)

		if line ~= "" then
			line = line:gsub("^%*%s*", "")
			line = mw.text.trim(line)

			local linkedTitle = line:match("^%[%[([^%]|]+)|?.-%]%]$")
			if linkedTitle then
				line = linkedTitle
			end

			if line ~= "" then
				table.insert(pages, line)
			end
		end
	end

	return pages
end

local function cleanWikitext(s)
	if not s or s == "" then
		return ""
	end

	s = s:gsub("<!%-%-.-%-%->", "")
	s = s:gsub("<ref[^>/]-/>", "")
	s = s:gsub("<ref.->.-</ref>", "")
	s = s:gsub("<ref.->", "")
	s = s:gsub("%[%[File:.-%]%]", "")
	s = s:gsub("%[%[Image:.-%]%]", "")
	s = s:gsub("%{%b{}%}", "")
	s = s:gsub("'''", "")
	s = s:gsub("''", "")
	s = s:gsub("%[%[([^%]|]+)|([^%]]+)%]%]", "%2")
	s = s:gsub("%[%[([^%]]+)%]%]", "%1")
	s = s:gsub("\r", "")
	s = s:gsub("[ \t]+", " ")

	return mw.text.trim(s)
end

local function shorten(s)
	if mw.ustring.len(s) > 200 then
		return mw.ustring.sub(s, 1, 197) .. "…"
	end

	return s
end

local function isIgnoredLine(raw, cleaned)
	raw = raw or ""
	cleaned = cleaned or ""

	if cleaned == "" then
		return true
	end

	if raw:match("^%s*{{") or raw:match("^%s*|") or raw:match("^%s*}}") then
		return true
	end

	if cleaned:match("^__%u+__$") then
		return true
	end

	if cleaned:match("^%[%[[Cc]ategory:") then
		return true
	end

	return false
end

local function extractHeadlineFromContent(wikitext)
	if not wikitext or wikitext == "" then
		return ""
	end

	for line in mw.text.gsplit(wikitext, "\n", true) do
		local raw = line
		local cleaned = cleanWikitext(line)

		if raw:match("^==+%s*[^=].-==+%s*$") then
			break
		end

		if not isIgnoredLine(raw, cleaned) then
			return shorten(cleaned)
		end
	end

	for line in mw.text.gsplit(wikitext, "\n", true) do
		local raw = mw.text.trim(line)

		if raw:match("^==+%s*[^=].-==+%s*$") then
			local cleaned = raw:gsub("^=+%s*", ""):gsub("%s*=+$", "")
			cleaned = cleanWikitext(cleaned)

			if cleaned ~= "" then
				return shorten(cleaned)
			end
		end
	end

	for line in mw.text.gsplit(wikitext, "\n", true) do
		local raw = line
		local cleaned = cleanWikitext(line)

		if not isIgnoredLine(raw, cleaned) then
			return shorten(cleaned)
		end
	end

	return ""
end

local function normalizeFileName(value)
	if not value or value == "" then
		return nil
	end

	value = mw.text.trim(value)
	value = value:gsub("<!%-%-.-%-%->", "")
	value = mw.text.trim(value)

	if value == "" then
		return nil
	end

	local linkedFile = value:match("%[%[%s*[Ff]ile%s*:%s*([^%]|%]]+)")
		or value:match("%[%[%s*[Ii]mage%s*:%s*([^%]|%]]+)")

	if linkedFile then
		value = linkedFile
	else
		value = value:gsub("^%s*[Ff]ile%s*:%s*", "")
		value = value:gsub("^%s*[Ii]mage%s*:%s*", "")
		value = value:gsub("|.*$", "")
		value = value:gsub("%]%].*$", "")
	end

	value = mw.text.trim(value)

	if value == "" then
		return nil
	end

	if value:lower() == "none" or value:lower() == "no" then
		return nil
	end

	return "File:" .. value
end

local function extractImageFromContent(wikitext)
	if not wikitext or wikitext == "" then
		return nil
	end

	for line in mw.text.gsplit(wikitext, "\n", true) do
		local value = line:match("^%s*|%s*image%d*%s*=%s*(.-)%s*$")

		if value then
			local file = normalizeFileName(value)

			if file then
				return file
			end
		end
	end

	local fallback = wikitext:match("%[%[%s*[Ff]ile%s*:%s*([^%]|%]]+)")
		or wikitext:match("%[%[%s*[Ii]mage%s*:%s*([^%]|%]]+)")

	if fallback then
		return normalizeFileName(fallback)
	end

	return nil
end

local function getFeaturedData()
	local pages = getPool()

	if #pages == 0 then
		return nil, "No featured pages defined."
	end

	local day = tonumber(os.date("%j")) or 1
	local index = ((day - 1) % #pages) + 1
	local title = pages[index]

	local page = mw.title.new(title)
	local headline = ""
	local image = nil

	if page and page.exists then
		local content = page:getContent() or ""
		headline = extractHeadlineFromContent(content)
		image = extractImageFromContent(content)
	end

	if headline == "" then
		headline = "Featured page for " .. os.date("%d %B %Y") .. "."
	end

	return {
		title = title,
		page = page,
		headline = headline,
		image = image
	}
end

function p.main(frame)
	local args = frame and frame.args or {}
	local data, err = getFeaturedData()

	if not data then
		return err
	end

	if args.titleonly == "1" then
		return data.title
	end

	if args.imageonly == "1" then
		return data.image or ""
	end

	return string.format(
		"'''[[%s]]'''<div style=\"margin-top:0.35em;\"><small>%s</small></div>",
		data.title,
		mw.text.nowiki(data.headline)
	)
end

function p.box()
	local data, err = getFeaturedData()

	if not data then
		return '<div class="featured-box"><div class="featured-box-title">Featured page</div><div class="featured-box-body">' .. err .. '</div></div>'
	end

	local page = mw.title.new(data.title)
	local pool = mw.title.new("Template:Featured pool")
	local current = mw.title.getCurrentTitle()

	local pageUrl = page and page:fullUrl() or ""
	local editUrl = page and page:fullUrl("action=edit") or ""
	local poolUrl = pool and pool:fullUrl() or ""
	local purgeUrl = current and current:fullUrl("action=purge") or ""

	local imageBlock = ""

	if data.image then
		imageBlock = string.format(
			'<div class="featured-box-image">[[%s|frameless|160x160px|link=%s|%s]]</div>',
			data.image,
			data.title,
			data.title
		)
	end

	return string.format(
		'<div class="featured-box">' ..
		'<div class="featured-box-title">Featured page</div>' ..
		'<div class="featured-box-body">' ..
		'%s' ..
		'<div class="featured-box-text">' ..
		'<div class="featured-box-name">\'\'\'[[%s]]\'\'\'</div>' ..
		'<div class="featured-box-headline"><small>%s</small></div>' ..
		'<div class="featured-box-actions">[%s Open page] [%s Edit page] [%s Featured pool] [%s Refresh]</div>' ..
		'</div>' ..
		'</div>' ..
		'</div>',
		imageBlock,
		data.title,
		mw.text.nowiki(data.headline),
		pageUrl,
		editUrl,
		poolUrl,
		purgeUrl
	)
end

return p