-- abbreviations.lua
-- SPDX-FileCopyrightText: 2025 toastal <toastal@posteo.net>
-- SPDX-License-Identifier: MPL-2.0
--
-- This plugin fills <abbr> tags with a table that will fill in empty titles
--
-- TODO: read a relative abbreviations.X for page-specific content & overrides

Plugin.require_version("4.3.0")

abbrs = config["table"]

if not Value.is_table(abbrs) then
	Log.warning("`table` missing from `abbreviation` config")
	Plugin.exit()
end

function process(elem)
	HTML.set_tag_name(elem, "abbr")
	if not (HTML.has_class(elem, "untitled")) then
		local current_title = HTML.get_attribute(elem, "title")
		if Value.is_nil(current_title) or current_title == "" then
			local text_content = HTML.strip_tags(elem)
			if Value.is_nil(text_content) or text_content == "" then
				Plugin.fail("Empty <abbr>")
			end
			local new_title = abbrs[text_content]
			Log.debug(format("Substituting abbreviation: %s → %s", text_content, new_title))
			if new_title then
				HTML.set_attribute(elem, "title", new_title)
			else
				Log.warning(format("“%s” not in the abbreviation table. Either provide an entry in the configuration file or make sure the <abbr> element has a `title` attribute or the ``.untitled`` class as a utility hack. Sometimes this may be intentional.", text_content))
			end
		end
	end
	HTML.remove_class(elem, "abbr")
	HTML.remove_class(elem, "untitled")
end

local selectors = Table.get_key_default(config, "selectors", {"abbr", ".abbr"})
Table.iter_values(process, HTML.select_all_of(page, selectors))