import { platform } from 'os';
import { Choice } from 'prompts';

import { prompt, getNonInteractiveStreamName } from '../util/prompt';
import { UsageError } from '@alwaysai/alwayscli';
import { TargetProtocol } from '../util/target-protocol';

export async function targetProtocolPromptedInputComponent(props: {
  targetProtocol?: TargetProtocol;
  developerHostPlatform?: NodeJS.Platform;
}) {
  const developerHostPlatform = props.developerHostPlatform || platform();

  if (developerHostPlatform !== 'linux') {
    return TargetProtocol['ssh+docker:'];
  }

  const nonInteractiveStreamName = getNonInteractiveStreamName();
  if (nonInteractiveStreamName) {
    throw new UsageError(
      `We were about to prompt you to choose whether you want to run your application here on this computer or on a remote device, but this shell is not fully interactive. ("${nonInteractiveStreamName}" is not a TTY.) You can re-run this command in a fully interactive shell, or you can provide the "protocol" command-line option together with the "yes" flag, which disables interactive prompts.`,
    );
  }

  const choices: Choice[] = [
    { title: 'Your local computer', value: TargetProtocol['docker:'] },
    {
      title: 'Remote device',
      value: TargetProtocol['ssh+docker:'],
    },
  ];

  const foundChoiceIndex = choices.findIndex(
    choice => choice.value === props.targetProtocol,
  );
  const initial = foundChoiceIndex > -1 ? foundChoiceIndex : 0;

  const answer = await prompt([
    {
      type: 'select',
      name: 'protocol',
      message: 'What is the destination?',
      initial,
      choices,
    },
  ]);

  const protocol: TargetProtocol = answer.protocol;
  return protocol;
}