#!/usr/bin/env node
import chalk from 'chalk';
import minimist from 'minimist';
import table from 'text-table';
import ms from 'ms';
import NowAlias from '../lib/alias';
import login from '../lib/login';
import * as cfg from '../lib/cfg';
import { error } from '../lib/error';
import toHost from '../lib/to-host';

const argv = minimist(process.argv.slice(2), {
  boolean: ['help', 'debug'],
  alias: {
    help: 'h',
    debug: 'd'
  }
});
const subcommand = argv._[0];

// options
const help = () => {
  console.log(`
  ${chalk.bold('𝚫 now alias')} <ls | set | rm> <deployment> <alias>

  ${chalk.dim('Options:')}

    -h, --help   output usage information
    -d, --debug  debug mode [off]

  ${chalk.dim('Examples:')}

  ${chalk.gray('–')} Lists all your aliases:

      ${chalk.cyan('$ now alias ls')}

  ${chalk.gray('–')} Adds a new alias to ${chalk.underline('my-api.now.sh')}:

      ${chalk.cyan(`$ now alias set ${chalk.underline('api-ownv3nc9f8.now.sh')} ${chalk.underline('my-api.now.sh')}`)}

      The ${chalk.dim('`.now.sh`')} suffix can be ommited:

      ${chalk.cyan('$ now alias set api-ownv3nc9f8 my-api')}

      The deployment id can be used as the source:

      ${chalk.cyan('$ now alias set deploymentId my-alias')}

      Custom domains work as alias targets:

      ${chalk.cyan(`$ now alias set ${chalk.underline('api-ownv3nc9f8.now.sh')} ${chalk.underline('my-api.com')}`)}

      ${chalk.dim('–')} The subcommand ${chalk.dim('`set`')} is the default and can be skipped.
      ${chalk.dim('–')} ${chalk.dim('`http(s)://`')} in the URLs is unneeded / ignored.

  ${chalk.gray('–')} Removing an alias:

      ${chalk.cyan('$ now alias rm aliasId')}

      To get the list of alias ids, use ${chalk.dim('`now alias ls`')}.

  ${chalk.dim('Alias:')} ln
`);
};

// options
const debug = argv.debug;
const apiUrl = argv.url || 'https://api.zeit.co';

const exit = (code) => {
  // we give stdout some time to flush out
  // because there's a node bug where
  // stdout writes are asynchronous
  // https://github.com/nodejs/node/issues/6456
  setTimeout(() => process.exit(code || 0), 100);
};

if (argv.help || !subcommand) {
  help();
  exit(0);
} else {
  const config = cfg.read();

  Promise.resolve(config.token || login(apiUrl))
  .then(async (token) => {
    try {
      await run(token);
    } catch (err) {
      if (err.userError) {
        error(err.message);
      } else {
        error(`Unknown error: ${err.stack}`);
      }
      exit(1);
    }
  })
  .catch((e) => {
    error(`Authentication error – ${e.message}`);
    exit(1);
  });
}

async function run (token) {
  const alias = new NowAlias(apiUrl, token, { debug });
  const args = argv._.slice(1);

  switch (subcommand) {
    case 'list':
    case 'ls':
      if (0 !== args.length) {
        error('Invalid number of arguments');
        return exit(1);
      }

      const list = await alias.list();
      const urls = new Map(list.map(l => [l.uid, l.url]));
      const aliases = await alias.ls();
      aliases.sort((a, b) => new Date(b.created) - new Date(a.created));
      const current = new Date();

      const text = table(aliases.map((_alias) => {
        const _url = chalk.underline(`https://${_alias.alias}`);
        const target = _alias.deploymentId;
        const _sourceUrl = urls.get(target)
          ? chalk.underline(`https://${urls.get(target)}`)
          : chalk.gray('<null>');

        const time = chalk.gray(ms(current - new Date(_alias.created)) + ' ago');
        return [
          '',
          // we default to `''` because some early aliases didn't
          // have an uid associated
          null == _alias.uid ? '' : _alias.uid,
          _sourceUrl,
          _url,
          time
        ];
      }), { align: ['l', 'r', 'l'], hsep: ' '.repeat(3) });

      if (text) console.log('\n' + text + '\n');
      break;

    case 'remove':
    case 'rm':
      const _target = String(args[0]);
      if (!_target) {
        const err = new Error('No alias id specified');
        err.userError = true;
        throw err;
      }

      if (1 !== args.length) {
        error('Invalid number of arguments');
        return exit(1);
      }

      const _aliases = await alias.ls();
      const _alias = findAlias(_target, _aliases);

      if (!_alias) {
        const err = new Error(`Alias not found by "${_target}". Run ${chalk.dim('`now alias ls`')} to see your aliases.`);
        err.userError = true;
        throw err;
      }

      try {
        const confirmation = (await readConfirmation(alias, _alias, _aliases)).toLowerCase();
        if ('y' !== confirmation && 'yes' !== confirmation) {
          console.log('\n> Aborted');
          process.exit(0);
        }

        const start = new Date();
        await alias.rm(_alias);
        const elapsed = ms(new Date() - start);
        console.log(`${chalk.cyan('> Success!')} Alias ${chalk.bold(_alias.uid)} removed [${elapsed}]`);
      } catch (err) {
        error(err);
        exit(1);
      }

      break;

    case 'add':
    case 'set':
      if (2 !== args.length) {
        error('Invalid number of arguments');
        return exit(1);
      }
      await alias.set(String(args[0]), String(args[1]));
      break;

    default:
      if (2 === argv._.length) {
        await alias.set(String(argv._[0]), String(argv._[1]));
      } else if (argv._.length >= 3) {
        error('Invalid number of arguments');
        help();
        exit(1);
      } else {
        error('Please specify a valid subcommand: ls | set | rm');
        help();
        exit(1);
      }
  }

  alias.close();
}

function indent (text, n) {
  return text.split('\n').map((l) => ' '.repeat(n) + l).join('\n');
}

async function readConfirmation (alias, _alias, list) {
  const deploymentsList = await alias.list();
  const urls = new Map(deploymentsList.map(l => [l.uid, l.url]));

  return new Promise((resolve, reject) => {
    const time = chalk.gray(ms(new Date() - new Date(_alias.created)) + ' ago');
    const _sourceUrl = chalk.underline(`https://${urls.get(_alias.deploymentId)}`);
    const tbl = table(
      [[_alias.uid, _sourceUrl, chalk.underline(`https://${_alias.alias}`), time]],
      { align: ['l', 'r', 'l'], hsep: ' '.repeat(6) }
    );

    process.stdout.write('> The following deployment will be removed permanently\n');
    process.stdout.write('  ' + tbl + '\n');
    process.stdout.write(`  ${chalk.bold.red('> Are you sure?')} ${chalk.gray('[yN] ')}`);

    process.stdin.on('data', (d) => {
      process.stdin.pause();
      resolve(d.toString().trim());
    }).resume();
  });
}

function findAlias (alias, list) {
  let key, val;
  if (/\./.test(alias)) {
    val = toHost(alias);
    key = 'alias';
  } else {
    val = alias;
    key = 'uid';
  }

  const _alias = list.find((d) => {
    if (d[key] === val) {
      if (debug) console.log(`> [debug] matched alias ${d.uid} by ${key} ${val}`);
      return true;
    }

    // match prefix
    if (`${val}.now.sh` === d.alias) {
      if (debug) console.log(`> [debug] matched alias ${d.uid} by url ${d.host}`);
      return true;
    }

    return false;
  });

  return _alias;
}