// wrap you JavaScript function with an English API:
jarvis.addCommand({
  command: '$number to the power of $power',
  handler: ({args: {number, power}}) => {
    const result = Math.pow(parseInt(number), parseInt(power));
    return `${number} to the power of ${power} is ${result}!`;
  }
});

const Jarvis = require('jarvis');            // use jarvis to
const IssueClient = require('issue-client'); // wrap this with a basic english API

const app = new Jarvis();
const client = new IssueClient();

// register command
app.addCommand({
  command: 'connectToRepository $repoName',
  aliases: [
    'connect to $repoName',
    'connect repo $repoName',
    'connect to $repoName repo'
  ],
  handler: async ({args: {repoName}}) => {
    const res = await client.connect(repoName);
    return res.success ? `Connected to ${repoName}.` : `Could not connect to ${repoName}. Here's the error: ${res.error}`;
  }
});

// exercise the command
const res = await app.send('connect to hliyan/jarvis');
console.log(res); // "Connected to hliyan/jarvis."

const FAQClient = require('./faq');   // business logic from here
const Jarvis = require('jarvis');     // wrapped by jarvis 
const readline = require('readline'); // and connected to a command line

const app = new Jarvis();
const client = new FAQClient();

// register the command
app.addCommand({
  command: 'getCountryPresident $country',
  aliases: [
    'who is the president of $country',
    '$country president'
  ],
  handler: async ({args: {country}}) => {
    const president = await client.getPresident(country);
    return president ? `the president of ${country} is ${president}`
      : `i don't know ${country}`;
  }
});

// start the CLI
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  prompt: 'jarvis> '
});

rl.prompt();

// feed CLI input to the app, and app output back to CLI
rl.on('line', async (line) => {
  const res = await app.send(line.trim());
  console.log(res ? `  ${res}` : '  I don\'t understand');
  rl.prompt();
});

// TODO: error handling and other best practices

  const jarvis = new Jarvis();
  jarvis.addCommand({
    command: 'repl',
    handler: ({context, line}) => {
      if (!context.activeCommand) {
        context.startCommand('repl');
        context.setCommandState({status: 'awaitInput'});
        return 'Enter input: ';
      }
  
      if (context.state.status === 'awaitInput') {
        const out = 'Handled: ' + line;
        return out;
      }
    }
  });