require "util.printing";

local actions = {
	help = require "cli.help",
	query = require "cli.query",
	dump = require "cli.dump",
	pack = require "cli.pack",
};

local function parse_args(...)
	local options = {};
	local args = {};

	require "util.args" ({
		function (arg)
			if options.action then
				args[#args + 1] = arg;
			else
				options.action = arg;
			end

			return true, true;
		end,
		repo = function (arg)
			if options.repo ~= nil then
				error "a repo may be specified only once";
			else
				options.repo = arg;
				return true;
			end
		end,
		help = actions.help,
	}, ...);

	if not options.action then
		error "no action specified";
	end

	return options, args;
end

return function (...)
	xpcall(
		function (...)
			local options, args = parse_args(...);
			options.repo = options.repo or "https://dl.flathub.org/repo";

			return actions[options.action](options, table.unpack(args));
		end,
		function (err)
			print(table.concat { "unhandled error: ", err, "\n", debug.traceback(nil, 2):match "^[^\n]+\n(.+)$" });
		end,
		...
	);
end