local ostree = require "ostree";
-- TODO: make this an option
local repo_url = "https://dl.flathub.org/repo";

return function (name, out)
	local repo = ostree.from_http(repo_url);
	local ref = repo:read_ref(name);
	local commit = repo:read_commit(ref);

	local function dump_file(path, file)
		print("Dumping " .. path .. "...");

		local file_obj = repo:read_file(file);

		if file_obj.type == "file" then
			local f = assert(io.open(out .. "/" .. path, "w"));
			for seg in file_obj.get_content() do
				assert(f:write(seg));
			end
			f:close();
		else
			os.execute(("ln -s %q %q"):format(file_obj.target, out .. "/" .. path));
		end
	end
	local function dump_dir(path, dir)
		print("Dumping " .. path .. "...");
		os.execute(("mkdir %q"):format(out .. "/" .. path));

		local dir_obj = repo:read_dir(dir);

		for subname, subdir in pairs(dir_obj.dirs) do
			dump_dir(path .. "/" .. subname, subdir);
		end

		for subname, subfile in pairs(dir_obj.files) do
			dump_file(path .. "/" .. subname, subfile);
		end
	end

	dump_dir("/", commit.root);
end