const lightsailClient = require('../src/lightsailClient');

function parseArgs(argv) {
  const SUBCOMMANDED = new Set(['snapshot']);
  const [command, ...rest] = argv;

  if (SUBCOMMANDED.has(command)) {
    const [subcommand, ...subRest] = rest;
    return { command, subcommand, args: subRest, options: {} };
  }

  const args = [];
  const options = {};
  for (let i = 0; i < rest.length; i += 1) {
    const token = rest[i];
    if (token.startsWith('--')) {
      const key = token.slice(2);
      options[key] = rest[i + 1];
      i += 1;
    } else {
      args.push(token);
    }
  }
  return { command, subcommand: null, args, options };
}

async function dispatch(parsed, clientModule) {
  const { command, subcommand, args, options } = parsed;

  if (command === 'list') {
    return clientModule.listInstances();
  }
  if (command === 'status') {
    return clientModule.getInstance(args[0]);
  }
  if (command === 'create') {
    return clientModule.createInstance({
      instanceName: args[0],
      bundleId: options.bundle,
      blueprintId: options.blueprint,
      availabilityZone: options.az,
    });
  }
  if (command === 'delete') {
    return clientModule.deleteInstance(args[0]);
  }
  if (command === 'start') {
    return clientModule.startInstance(args[0]);
  }
  if (command === 'stop') {
    return clientModule.stopInstance(args[0]);
  }
  if (command === 'reboot') {
    return clientModule.rebootInstance(args[0]);
  }
  if (command === 'snapshot' && subcommand === 'create') {
    return clientModule.createSnapshot(args[0], args[1]);
  }
  if (command === 'snapshot' && subcommand === 'list') {
    return clientModule.listSnapshots();
  }
  if (command === 'snapshot' && subcommand === 'delete') {
    return clientModule.deleteSnapshot(args[0]);
  }

  throw new Error(`Unknown command: ${command}`);
}

async function main() {
  console.error(`[lightsail-cli] region=${process.env.AWS_REGION || '(unset)'}`);
  const parsed = parseArgs(process.argv.slice(2));
  const result = await dispatch(parsed, lightsailClient);
  console.log(JSON.stringify(result, null, 2));
}

if (require.main === module) {
  main().catch((err) => {
    console.error(`${err.name || 'Error'}: ${err.message}`);
    process.exit(1);
  });
}

module.exports = { parseArgs, dispatch };