local createVersion = require('/apis/libversion');

local function printUsage()
  print('trapos-postinstall usage:');
  print();
  print('\t\ttrapos-postinstall');
  print('\t\ttrapos-postinstall version');
  print('\t\ttrapos-postinstall help');
end

local command = ...;

if command == 'version' or command == '-version' or command == '--version' then
  print('v' .. createVersion().forSelf());
  return;
end

if command == 'help' or command == '-help' or command == '--help' then
  printUsage();
  return;
end

if command ~= nil and command ~= '' then
  printUsage();
  return;
end

local function readManifestVersion()
  if not fs.exists('/trapos/manifest.json') then return nil; end
  local f = fs.open('/trapos/manifest.json', 'r');
  if not f then return nil; end
  local data = f.readAll();
  f.close();
  local manifest = data and textutils.unserializeJSON(data);
  return manifest and manifest.version or nil;
end

local version = readManifestVersion();

print();
if version then
  print('=> TrapOS v' .. version .. ' installed.');
else
  print('=> TrapOS installed.');
end
print();
print('Get started:');
print('  sandbox --help    -- open the sandbox help');
print('  trapos-upgrade    -- update and upgrade TrapOS');
print();