-- Module:AdminCheck
-- Determines whether a supplied username is an administrator.
--
-- USAGE
--   {{#invoke:AdminCheck|render|Example}}
--     → "yes" / "no"
--
--   {{#invoke:AdminCheck|_isAdmin|Example}}
--     → returns a boolean when called from Lua
--
--   {{#invoke:AdminCheck|isAdmin|Example}}
--     → same as |render but returns boolean-ish wikitext ("1" / "")
--
--------------------------------------------------------------------------------

local p = {}

-------------------------------------------------------------------------------
-- Helper: load the JSON list of sysops once per page‑view
-------------------------------------------------------------------------------
local function loadAdminTable()
	-- Fetch the raw JSON text
	local title  = mw.title.new('User:AmoryBot/crathighlighter.js/sysop.json')
	if not title then
		return {}
	end

	local jsonText = title:getContent()
	if not jsonText or jsonText == '' then
		return {}
	end

	-- Convert JSON → Lua table
	local ok, data = pcall(mw.text.jsonDecode, jsonText)
	if ok and type(data) == 'table' then
		return data
	end

	-- Fallback – return an empty table on any error
	return {}
end

-- Cached for this invocation
local ADMINS = loadAdminTable()

-------------------------------------------------------------------------------
-- Internal utility – normalise usernames
-------------------------------------------------------------------------------
local function normalise(name)
	if not name then
		return ''
	end
	-- Trim whitespace, convert underscores to spaces, capitalise first letter
	name = name:gsub('_', ' '):gsub('^%s*(.-)%s*$', '%1')
	-- MediaWiki forces first‑letter capitalisation on usernames
	name = mw.ustring.upper(mw.ustring.sub(name, 1, 1)) .. mw.ustring.sub(name, 2)
	return name
end

-------------------------------------------------------------------------------
-- Core boolean check
-------------------------------------------------------------------------------
function p._isAdmin(username)
	username = normalise(username)
	return not not ADMINS[username]  -- coerce to boolean
end

-------------------------------------------------------------------------------
-- Interface for templates / #invoke –
-- returns “1” for true, “” for false (so it works in #if), or explicit text.
-------------------------------------------------------------------------------
function p.isAdmin(frame)
	local name = frame.args[1] or frame:getParent().args[1] or ''
	return p._isAdmin(name) and '1' or ''
end

-- Friendly renderer that outputs “yes” / “no”
function p.render(frame)
	local name = frame.args[1] or frame:getParent().args[1] or ''
	return p._isAdmin(name) and 'yes' or 'no'
end

return p