#!/usr/bin/env node

// Packages
const chalk = require('chalk');
const minimist = require('minimist');
const table = require('text-table');
const ms = require('ms');

// Ours
const strlen = require('../lib/strlen');
const NowAlias = require('../lib/alias');
const NowDomains = require('../lib/domains');
const login = require('../lib/login');
const cfg = require('../lib/cfg');
const { error } = require('../lib/error');
const toHost = require('../lib/to-host');
const { reAlias } = require('../lib/re-alias');
const exit = require('../lib/utils/exit');
const logo = require('../lib/utils/output/logo');
const promptBool = require('../lib/utils/input/prompt-bool');

const argv = minimist(process.argv.slice(2), {
  string: ['config', 'token', 'rules'],
  boolean: ['help', 'debug'],
  alias: {
    help: 'h',
    config: 'c',
    rules: 'r',
    debug: 'd',
    token: 't'
  }
});

const subcommand = argv._[0];

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

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

    -h, --help                         Output usage information
    -c ${chalk.bold.underline('FILE')}, --config=${chalk.bold.underline('FILE')}             Config file
    -r ${chalk.bold.underline('RULES_FILE')}, --rules=${chalk.bold.underline('RULES_FILE')}  Rules file
    -d, --debug                        Debug mode [off]
    -t ${chalk.bold.underline('TOKEN')}, --token=${chalk.bold.underline('TOKEN')}            Login token

  ${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('–')} Add and modify path based aliases for ${chalk.underline('zeit.ninja')}:

      ${chalk.cyan(`$ now alias ${chalk.underline('zeit.ninja')} -r ${chalk.underline('rules.json')}`)}

      Export effective routing rules:

      ${chalk.cyan(`$ now alias ls aliasId --json > ${chalk.underline('rules.json')}`)}

      ${chalk.cyan(`$ now alias ls zeit.ninja`)}

  ${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';

if (argv.config) {
  cfg.setConfigFile(argv.config);
}

if (argv.help) {
  help();
  exit(0);
} else {
  Promise.resolve().then(async () => {
    const config = await cfg.read();

    let token;
    try {
      token = argv.token || config.token || (await login(apiUrl));
    } catch (err) {
      error(`Authentication error – ${err.message}`);
      exit(1);
    }

    try {
      await run({token, config});
    } catch (err) {
      if (err.userError) {
        error(err.message);
      } else {
        error(`Unknown error: ${err}\n${err.stack}`);
      }
      exit(1);
    }
  });
}

async function run({token, config: {currentTeam, user}}) {
  const alias = new NowAlias({apiUrl, token, debug, currentTeam });
  const domains = new NowDomains({apiUrl, token, debug, currentTeam });
  const args = argv._.slice(1);

  switch (subcommand) {
    case 'ls':
    case 'list': {
      if (args.length === 1) {
        const list = await alias.listAliases();
        const item = list.find(
          e => e.uid === argv._[1] || e.alias === argv._[1]
        );
        if (!item || !item.rules) {
          error(`Could not match path alias for: ${argv._[1]}`);
          return exit(1);
        }

        if (argv.json) {
          console.log(JSON.stringify({ rules: item.rules }, null, 2));
        } else {
          const header = [
            ['', 'pathname', 'method', 'dest'].map(s => chalk.dim(s))
          ];
          const text = list.length === 0
            ? null
            : table(
                header.concat(
                  item.rules.map(rule => {
                    return [
                      '',
                      rule.pathname ? rule.pathname : '',
                      rule.method ? rule.method : '*',
                      rule.dest
                    ];
                  })
                ),
                {
                  align: ['l', 'l', 'l', 'l'],
                  hsep: ' '.repeat(2),
                  stringLength: strlen
                }
              );

          console.log(text);
        }
        break;
      } else if (args.length !== 0) {
        error(
          `Invalid number of arguments. Usage: ${chalk.cyan('`now alias ls`')}`
        );
        return exit(1);
      }

      const start_ = new Date();
      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 header = [
        ['', 'id', 'source', 'url', 'created'].map(s => chalk.dim(s))
      ];
      const text = list.length === 0
        ? null
        : table(
            header.concat(
              aliases.map(_alias => {
                const _url = chalk.underline(`https://${_alias.alias}`);
                const target = _alias.deploymentId;
                let _sourceUrl;
                if (urls.get(target)) {
                  _sourceUrl = chalk.underline(`https://${urls.get(target)}`);
                } else if (_alias.rules) {
                  _sourceUrl = chalk.gray(
                    `[${_alias.rules.length} custom rule${_alias.rules.length > 1 ? 's' : ''}]`
                  );
                } else {
                  _sourceUrl = 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
                  _alias.uid === null ? '' : _alias.uid,
                  _sourceUrl,
                  _url,
                  time
                ];
              })
            ),
            {
              align: ['l', 'r', 'l', 'l'],
              hsep: ' '.repeat(2),
              stringLength: strlen
            }
          );

      const elapsed_ = ms(new Date() - start_);
      console.log(
        `> ${aliases.length} alias${aliases.length === 1 ? '' : 'es'} found ${chalk.gray(`[${elapsed_}]`)} under ${
          chalk.bold(
            (currentTeam && currentTeam.slug) || user.username || user.email
          )
        }`
      );

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

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

      if (args.length !== 1) {
        error(
          `Invalid number of arguments. Usage: ${chalk.cyan('`now alias rm <id>`')}`
        );
        return exit(1);
      }

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

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

      try {
        const confirmation = await confirmDeploymentRemoval(alias, _alias);
        if (!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 (argv.rules) {
        await updatePathAlias(alias, argv._[0], argv.rules, domains);
        break;
      }
      if (args.length !== 2) {
        error(
          `Invalid number of arguments. Usage: ${chalk.cyan('`now alias set <id> <domain>`')}`
        );
        return exit(1);
      }
      await alias.set(String(args[0]), String(args[1]), currentTeam, user);
      break;
    }
    default: {
      if (argv._.length === 0) {
        await reAlias(token, null, null, help, exit, apiUrl, debug, alias);
        break;
      }

      if (argv._.length === 1) {
        await reAlias(
          token,
          null,
          String(argv._[0]),
          help,
          exit,
          apiUrl,
          debug,
          alias
        );
        break;
      }

      if (argv.rules) {
        await updatePathAlias(alias, argv._[0], argv.rules, domains);
      } else if (argv._.length === 2) {
        await alias.set(String(argv._[0]), String(argv._[1]), domains, currentTeam, user);
      } 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);
      }
    }
  }

  domains.close()
  alias.close();
}

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

  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) }
  );

  const msg =
    '> The following alias will be removed permanently\n' +
    `  ${tbl} \nAre you sure?`;

  return promptBool(msg, {
    trailing: '\n'
  });
}

function findAlias(alias, list) {
  let key;
  let 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;
}

async function updatePathAlias(alias, aliasName, rules, domains) {
  const start = new Date();
  const res = await alias.updatePathBasedroutes(String(aliasName), rules, domains);
  const elapsed = ms(new Date() - start);
  if (res.error) {
    const err = new Error(res.error.message);
    err.userError = true;
    throw err;
  } else {
    console.log(
      `${chalk.cyan('> Success!')} ${res.ruleCount} rules configured for ${chalk.underline(res.alias)} [${elapsed}]`
    );
  }
}