#!/usr/bin/env node
(function () {
'use strict';

var pkg = require('../package.json');
var os = require('os');

//var url = require('url');
var path = require('path');
var http = require('http');
//var https = require('https');
var YAML = require('js-yaml');
var recase = require('recase').create({});
var camelCopy = recase.camelCopy.bind(recase);
//var snakeCopy = recase.snakeCopy.bind(recase);

var urequest = require('@coolaj86/urequest');
var common = require('../lib/cli-common.js');

var argv = process.argv.slice(2);

var argIndex = argv.indexOf('--config');
var confpath;
var useTty;
var state = {};
if (-1 === argIndex) {
  argIndex = argv.indexOf('-c');
}
if (-1 !== argIndex) {
  confpath = argv.splice(argIndex, 2)[1];
}
argIndex = argv.indexOf('--tty');
if (-1 !== argIndex) {
  useTty = argv.splice(argIndex, 1);
}

function help() {
  //console.info('');
  //console.info('Telebit Remote v' + pkg.version);
  console.info('');
  console.info('Usage:');
  console.info('');
  console.info('\ttelebit [--config <path>] <module> <module-options>');
  console.info('');
  console.info('Examples:');
  console.info('');
  //console.info('\ttelebit init                            # bootstrap the config files');
  //console.info('');
  console.info('\ttelebit status                          # whether enabled or disabled');
  console.info('\ttelebit enable                          # disallow incoming connections');
  console.info('\ttelebit disable                         # allow incoming connections');
  console.info('');
  console.info('\ttelebit list                            # list rules for servernames and ports');
  console.info('');
  console.info('\ttelebit http none                       # remove all https handlers');
  console.info('\ttelebit http 3000                       # forward all https traffic to port 3000');
  console.info('\ttelebit http /module/path               # load a node module to handle all https traffic');
  console.info('');
  console.info('\ttelebit http none example.com           # remove https handler from example.com');
  console.info('\ttelebit http 3001 example.com           # forward https traffic for example.com to port 3001');
  console.info('\ttelebit http /module/path example.com   # forward https traffic for example.com to port 3001');
  console.info('');
  console.info('\ttelebit tcp none                        # remove all tcp handlers');
  console.info('\ttelebit tcp 5050                        # forward all tcp to port 5050');
  console.info('\ttelebit tcp /module/path                # handle all tcp with a node module');
  console.info('');
  console.info('\ttelebit tcp none 6565                   # remove tcp handler from external port 6565');
  console.info('\ttelebit tcp 5050 6565                   # forward external port 6565 to local 5050');
  console.info('\ttelebit tcp /module/path 6565           # handle external port 6565 with a node module');
  console.info('');
  console.info('Config:');
  console.info('');
  console.info('\tSee https://git.coolaj86.com/coolaj86/telebit.js');
  console.info('');
  console.info('');
}

var verstr = [ pkg.name + ' remote v' + pkg.version ];
if (!confpath) {
  confpath = path.join(os.homedir(), '.config/telebit/telebit.yml');
  verstr.push('(--config "' + confpath + '")');
}

if (-1 !== argv.indexOf('-h') || -1 !== argv.indexOf('--help')) {
  help();
  process.exit(0);
}
if (!confpath || /^--/.test(confpath)) {
  help();
  process.exit(1);
}

function askForConfig(state, mainCb) {
  var fs = require('fs');
  var ttyname = '/dev/tty';
  var stdin = useTty ? fs.createReadStream(ttyname, {
    fd: fs.openSync(ttyname, fs.constants.O_RDONLY | fs.constants.O_NOCTTY)
  }) : process.stdin;
  var readline = require('readline');
  var rl = readline.createInterface({
    input: stdin
  , output: process.stdout
    // https://github.com/nodejs/node/issues/21319
  , terminal: !useTty
  });
  state._useTty = useTty;

  // NOTE: Use of setTimeout
  // We're using setTimeout just to make the user experience a little
  // nicer, as if we're doing something inbetween steps, so that it
  // is a smooth rather than jerky experience.
  // >= 300ms is long enough to become distracted and change focus (a full blink, time for an idea to form as a thought)
  // <= 100ms is shorter than normal human reaction time (ability to place events chronologically, which happened first)
  // ~ 150-250ms is the sweet spot for most humans (long enough to notice change and not be jarred, but stay on task)
  var firstSet = [
    function askEmail(cb) {
      if (state.config.email) { cb(); return; }
      //console.info("");
      console.info("Welcome!");
      console.info("");
      console.info("By using Telebit you agree to:");
      console.info("");
      console.info("    [x] Accept the Telebit™ terms of service");
      console.info("    [x] Accept the Let's Encrypt™ terms of service");
      console.info("");
      console.info("Enter your email to agree and login/create your account:");
      console.info("");
      // TODO attempt to read email from npmrc or the like?
      rl.question('email: ', function (email) {
        email = /@/.test(email) && email.trim();
        if (!email) { askEmail(cb); return; }
        state.config.email = email.trim();
        state.config.agreeTos = true;
        console.info("");
        setTimeout(cb, 250);
      });
    }
  , function askRelay(cb) {
      function checkRelay(relay) {
        // TODO parse and check https://{{relay}}/.well-known/telebit.cloud/directives.json
        if (!relay) { relay = 'telebit.cloud'; }
        relay = relay.trim();
        var urlstr = common.parseUrl(relay) + common.apiDirectory;
        urequest({ url: urlstr, json: true }, function (err, resp, body) {
          if (err) {
            console.error("[Network Error] Failed to retrieve '" + urlstr + "'");
            console.error(err);
            askRelay(cb);
            return;
          }
          if (200 !== resp.statusCode || (Buffer.isBuffer(body) || 'object' !== typeof body) || !body.api_host) {
            console.warn("===================");
            console.warn("      WARNING      ");
            console.warn("===================");
            console.warn("");
            console.warn("[" + resp.statusCode + "] '" + urlstr + "'");
            console.warn("This server does not describe a current telebit version (but it may still work).");
            console.warn("");
            console.warn(body);
          } else if (body && body.pair_request) {
            state._can_pair = true;
          }
          state.config.relay = relay;
          cb();
        });
      }

      if (state.config.relay) { checkRelay(); return; }
      console.info("");
      console.info("");
      console.info("What relay will you be using? (press enter for default)");
      console.info("");
      rl.question('relay [default: telebit.cloud]: ', checkRelay);
    }
  , function checkRelay(cb) {
      nextSet = [];
      if ('telebit.cloud' !== state.config.relay) {
        nextSet = nextSet.concat(standardSet);
      }
      if (!state._can_pair) {
        nextSet = nextSet.concat(fossSet);
      }
      cb();
    }
  ];
  var standardSet = [
    // There are questions that we need to aks in the CLI
    // if we can't guarantee that they are being asked in the web interface
    function askAgree(cb) {
      if (state.config.agreeTos) { cb(); return; }
      console.info("");
      console.info("");
      console.info("Do you accept the terms of service for each and all of the following?");
      console.info("");
      console.info("\tTelebit - End-to-End Encrypted Relay");
      console.info("\tGreenlock - Automated HTTPS");
      console.info("\tLet's Encrypt - TLS Certificates");
      console.info("");
      console.info("Type 'y' or 'yes' to accept these Terms of Service.");
      console.info("");
      rl.question('agree to all? [y/N]: ', function (resp) {
        resp = resp.trim();
        if (!/^y(es)?$/i.test(resp) && 'true' !== resp) {
          throw new Error("You didn't accept the Terms of Service... not sure what to do...");
        }
        state.config.agreeTos = true;
        console.info("");
        setTimeout(cb, 250);
      });
    }
  , function askUpdates(cb) {
      // required means transactional, security alerts, mandatory updates
      var options = [ 'newsletter', 'important', 'required' ];
      if (-1 !== options.indexOf(state._updates)) { cb(); return; }
      console.info("");
      console.info("");
      console.info("What updates would you like to receive? (" + options.join(',') + ")");
      console.info("");
      rl.question('messages (default: important): ', function (updates) {
        state._updates = (updates || '').trim().toLowerCase();
        if (!state._updates) { state._updates = 'important'; }
        if (-1 === options.indexOf(state._updates)) { askUpdates(cb); return; }

        if ('newsletter' === state._updates) {
          state.config.newsletter = true;
          state.config.communityMember = true;
        } else if ('important' === state._updates) {
          state.config.communityMember = true;
        }

        setTimeout(cb, 250);
      });
    }
  , function askTelemetry(cb) {
      if (state.config.telemetry) { cb(); return; }
      console.info("");
      console.info("");
      console.info("Contribute project telemetry data? (press enter for default [yes])");
      console.info("");
      rl.question('telemetry [Y/n]: ', function (telemetry) {
        if (!telemetry || /^y(es)?$/i.test(telemetry)) {
          state.config.telemetry = true;
        }
        setTimeout(cb, 250);
      });
    }
  ];
  var fossSet = [
    function askTokenOrSecret(cb) {
      if (state._can_pair || state.token || state.config.token
        || state.secret || state.config.secret) { cb(); return; }
      console.info("");
      console.info("");
      console.info("What's your authorization for '" + state.config.relay + "'?");
      console.info("");
      // TODO check .well-known to learn supported token types
      console.info("Currently supported:");
      console.info("");
      console.info("\tToken (JWT format)");
      console.info("\tShared Secret (HMAC hex)");
      //console.info("\tPrivate key (hex)");
      console.info("");
      rl.question('auth: ', function (resp) {
        var jwt = require('jsonwebtoken');
        resp = (resp || '').trim();
        try {
          jwt.decode(resp);
          state.config.token = resp;
        } catch(e) {
          // is not jwt
        }
        if (!state.config.token) {
          resp = resp.toLowerCase();
          if (resp === Buffer.from(resp, 'hex').toString('hex')) {
            state.config.secret = resp;
          }
        }
        if (!state.config.token && !state.config.secret) {
          askTokenOrSecret(cb);
          return;
        }
        setTimeout(cb, 250);
      });
    }
  , function askServernames(cb) {
      if (!state.config.secret || state.config._servernames) { cb(); return; }
      console.info("");
      console.info("");
      console.info("What servername(s) will you be relaying here?");
      console.info("(use a comma-separated list such as example.com,example.net)");
      console.info("");
      rl.question('domain(s): ', function (resp) {
        resp = (resp || '').trim().split(/,/g);
        if (!resp.length) { askServernames(); return; }
        // TODO validate the domains
        state.config._servernames = resp;
        setTimeout(cb, 250);
      });
    }
  , function askPorts(cb) {
      if (!state.config.secret || state.config._ports) { cb(); return; }
      console.info("");
      console.info("");
      console.info("What tcp port(s) will you be relaying here?");
      console.info("(use a comma-separated list such as 2222,5050)");
      console.info("");
      rl.question('port(s) [default:none]: ', function (resp) {
        resp = (resp || '').trim().split(/,/g);
        if (!resp.length) { askPorts(); return; }
        // TODO validate the domains
        state.config._ports = resp;
        setTimeout(cb, 250);
      });
    }
  ];
  var nextSet = firstSet;

  function next() {
    var q = nextSet.shift();
    if (!q) {
      // https://github.com/nodejs/node/issues/21319
      if (useTty) { try { stdin.push(null); } catch(e) { /*ignore*/ } }
      rl.close();
      if (useTty) { try { stdin.close(); } catch(e) { /*ignore*/ } }
      mainCb(null, state);
      return;
    }
    q(next);
  }

  next();
}

var utils = {
  request: function request(opts, fn) {
    if (!opts) { opts = {}; }
    var service = opts.service || 'config';
    var req = http.get({
      socketPath: state._ipc.path
    , method: opts.method || 'GET'
    , path: '/rpc/' + service
    }, function (resp) {
      var body = '';

      function finish() {
        if (200 !== resp.statusCode) {
          console.warn(resp.statusCode);
          console.warn(body || ('get' + service + ' failed'));
          //cb(new Error("not okay"), body);
          return;
        }

        if (!body) { fn(null, null); return; }

        try {
          body = JSON.parse(body);
        } catch(e) {
          // ignore
        }

        fn(null, body);
      }

      if (resp.headers['content-length']) {
        resp.on('data', function (chunk) {
          body += chunk.toString();
        });
        resp.on('end', function () {
          finish();
        });
      } else {
        finish();
      }
    });
    req.on('error', function (err) {
      // ENOENT - never started, cleanly exited last start, or creating socket at a different path
      // ECONNREFUSED - leftover socket just needs to be restarted
      if ('ENOENT' === err.code || 'ECONNREFUSED' === err.code) {
        if (opts._taketwo) {
          console.error("Either the telebit service was not already (and could not be started) or its socket could not be written to.");
          console.error(err);
          return;
        }
        require('../usr/share/install-launcher.js').install({ env: process.env }, function (err) {
          if (err) { fn(err); return; }
          opts._taketwo = true;
          utils.request(opts, fn);
        });
        return;
      }
      if ('ENOTSOCK' === err.code) {
        console.error(err);
        return;
      }
      console.error(err);
      return;
    });
  }
, putConfig: function putConfig(service, args, fn) {
    //console.log('debug path:');
    //console.log('/rpc/' + service + '?_body=' + JSON.stringify(args));
    var req = http.get({
      socketPath: state._ipc.path
    , method: 'POST'
    , path: '/rpc/' + service + '?_body=' + JSON.stringify(args)
    }, function (resp) {

      function finish() {
        if ('function' === typeof fn) {
          fn(null, resp);
          return;
        }

        console.info("");
        if (200 !== resp.statusCode) {
          console.warn("'" + service + "' may have failed."
           + " Consider peaking at the logs either with 'journalctl -xeu telebit' or /opt/telebit/var/log/error.log");
          console.warn(resp.statusCode, body);
          //cb(new Error("not okay"), body);
          return;
        }

        if (!body) {
          console.info("👌");
          return;
        }

        try {
          body = JSON.parse(body);
        } catch(e) {
          // ignore
        }

        if ("AWAIT_AUTH" === body.code) {
          console.info(body.message);
        } else if ("CONFIG" === body.code) {
          delete body.code;
          console.info(YAML.safeDump(body));
        } else {
          console.info(JSON.stringify(body, null, 2));
        }
      }

      var body = '';
      if (resp.headers['content-length']) {
        resp.on('data', function (chunk) {
          body += chunk.toString();
        });
        resp.on('end', function () {
          finish();
        });
      } else {
        finish();
      }
    });
    req.on('error', function (err) {
      console.error('Put Config Error:');
      console.error(err);
      return;
    });
  }
};

// Two styles:
//     http 3000
//     http modulename
function makeRpc(key) {
  if (key !== argv[0]) {
    return false;
  }
  utils.putConfig(argv[0], argv.slice(1));
  return true;
}

function packConfig(config) {
  return Object.keys(config).map(function (key) {
    var val = config[key];
    if ('undefined' === val) {
      throw new Error("'undefined' used as a string value");
    }
    if ('undefined' === typeof val) {
      //console.warn('[DEBUG]', key, 'is present but undefined');
      return;
    }
    if (val && 'object' === typeof val && !Array.isArray(val)) {
      val = JSON.stringify(val);
    }
    return key + ':' + val; // converts arrays to strings with ,
  });
}

function getToken(err, state) {
  if (err) {
    console.error("Error while initializing config [init]:");
    throw err;
  }

  // { _otp, config: {} }
  common.api.token(state, {
    error: function (err/*, next*/) {
      console.error("[Error] common.api.token:");
      console.error(err);
      return;
    }
  , directory: function (dir, next) {
      //console.log('[directory] Telebit Relay Discovered:');
      //console.log(dir);
      state._apiDirectory = dir;
      next();
    }
  , tunnelUrl: function (tunnelUrl, next) {
      //console.log('[tunnelUrl] Telebit Relay Tunnel Socket:', tunnelUrl);
      state.wss = tunnelUrl;
      next();
    }
  , requested: function (authReq, next) {
      //console.log("[requested] Pairing Requested");
      state.config._otp = state.config._otp = authReq.otp;

      if (!state.config.token && state._can_pair) {
        console.info("");
        console.info("==============================================");
        console.info("                 Hey, Listen!                 ");
        console.info("==============================================");
        console.info("                                              ");
        console.info("  GO CHECK YOUR EMAIL!                        ");
        console.info("                                              ");
        console.info("  DEVICE PAIR CODE:     0000                  ".replace(/0000/g, state.config._otp));
        console.info("                                              ");
        console.info("==============================================");
        console.info("");
      }

      next();
    }
  , connect: function (pretoken, next) {
      //console.log("[connect] Enabling Pairing Locally...");
      state.config.pretoken = pretoken;
      state._connecting = true;

      // TODO use php-style object querification
      utils.putConfig('config', packConfig(state.config), function (err/*, body*/) {
        if (err) {
          state._error = err;
          console.error("Error while initializing config [connect]:");
          console.error(err);
          return;
        }
        console.log("waiting...");
        next();
      });
    }
  , offer: function (token, next) {
      //console.log("[offer] Pairing Enabled by Relay");
      state.config.token = token;
      if (state._error) {
        return;
      }
      state._connecting = true;
      console.log("Token Offered:");
      console.log(token);
      try {
        console.log(require('jsonwebtoken').decode(token));
      } catch(e) {
        console.warn("[warning] could not decode token");
      }
      utils.putConfig('config', packConfig(state.config), function (err/*, body*/) {
        if (err) {
          state._error = err;
          console.error("Error while initializing config [offer]:");
          console.error(err);
          return;
        }
        //console.log("Pairing Enabled Locally");
        next();
      });
    }
  , granted: function (_, next) {
      //console.log("[grant] Pairing complete!");
      next();
    }
  , end: function () {
      utils.putConfig('enable', [], function (err) {
        if (err) { console.error(err); return; }
        console.info("[end] Success");

        // workaround for https://github.com/nodejs/node/issues/21319
        if (state._useTty) {
          setTimeout(function () {
            console.info();
            console.info("Press any key to continue...");
            console.info();
            process.exit(0);
          }, 0.5 * 1000);
          return;
        }
        // end workaround

        parseCli(state);
      });
    }
  });
}

function parseCli(/*state*/) {
  if (-1 !== argv.indexOf('init')) {
    utils.putConfig('list', []/*, function (err) {
    }*/);
    return;
  }

  if ([ 'ssh', 'http', 'tcp' ].some(function (key) {
    if (key !== argv[0]) {
      return false;
    }
    if (argv[1]) {
      utils.putConfig(argv[0], argv.slice(1));
      return true;
    }
    return true;
  })) {
    help();
    process.exit(13);
    return;
  }

  if ([ 'status', 'enable', 'disable', 'restart', 'list', 'save' ].some(makeRpc)) {
    return;
  }

  help();
  process.exit(11);
}

function handleConfig(err, config) {
  //console.log('CONFIG');
  //console.log(config);
  state.config = config;

  if (err) { console.error(err); process.exit(101); return; }

  //
  // check for init first, before anything else
  // because it has arguments that may help in
  // the next steps
  //
  if (-1 !== argv.indexOf('init')) {
    parsers.init(argv, getToken);
    return;
  }

  if (!state.config.relay || !state.config.token) {
    if (!state.config.relay) {
      state.config.relay = 'telebit.cloud';
    }

    //console.log("question the user?", Date.now());
    askForConfig(state, function (err, state) {
      // no errors actually get passed, so this is just future-proofing
      if (err) { throw err; }

      if (!state.config.token && state._can_pair) {
        state.config._otp = common.otp();
      }

      //console.log("done questioning:", Date.now());
      state.relay = state.config.relay;
      if (!state.token && !state.config.token) {
        getToken(err, state);
      } else {
        parseCli(state);
      }
    });
    return;
  }

  //console.log("no questioning:");
  parseCli(state);
}

function parseConfig(err, text) {

  console.info("");
  console.info(verstr.join(' '));

  try {
    state._clientConfig = JSON.parse(text || '{}');
  } catch(e1) {
    try {
      state._clientConfig = YAML.safeLoad(text || '{}');
    } catch(e2) {
      console.error(e1.message);
      console.error(e2.message);
      process.exit(1);
      return;
    }
  }

  state._clientConfig = camelCopy(state._clientConfig || {}) || {};
  common._init(
    // make a default working dir and log dir
    state._clientConfig.root || path.join(os.homedir(), '.local/share/telebit')
  , (state._clientConfig.root && path.join(state._clientConfig.root, 'etc'))
      || path.resolve(common.DEFAULT_CONFIG_PATH, '..')
  );
  state._ipc = common.pipename(state._clientConfig, true);

  if (!Object.keys(state._clientConfig).length) {
    console.info('(' + state._ipc.comment + ": " + state._ipc.path + ')');
    console.info("");
  }

  if ((err && 'ENOENT' === err.code) || !Object.keys(state._clientConfig).length) {
    if (!err || 'ENOENT' === err.code) {
      //console.warn("Empty config file. Run 'telebit init' to configure.\n");
    } else {
      console.warn("Couldn't load config:\n\n\t" + err.message + "\n");
    }
  }

  utils.request({ service: 'config' }, handleConfig);
}

var parsers = {
  init: function (argv, parseCb) {
    var answers = {};
    var boolish = [ '--advanced' ];
    if ('init' !== argv[0]) {
      throw new Error("init must be the first argument");
    }
    argv.shift();

    // init --foo bar
    argv.forEach(function (arg, i) {
      if (!/^--/.test(arg)) { return; }
      if (-1 !== boolish.indexOf(arg)) {
        answers['_' + arg.replace(/^--/, '')] = true;
      }
      if (/^-/.test(argv[i + 1])) {
        throw new Error(argv[i + 1] + ' requires an argument');
      }
      answers[arg] = argv[i + 1];
    });

    // init foo:bar
    argv.forEach(function (arg) {
      if (/^--/.test(arg)) { return; }
      var parts = arg.split(/:/g);
      if (2 !== parts.length) {
        throw new Error("bad option to init: '" + arg + "'");
      }
      if (answers[parts[0]]) {
        throw new Error("duplicate key to init '" + parts[0] + "'");
      }
      answers[parts[0]] = parts[1];
    });

    // things that aren't straight-forward copy-over
    if (!answers.advanced && !answers.relay) {
      answers.relay = 'telebit.cloud';
    }
    if (Array.isArray(common._NOTIFICATIONS[answers.update])) {
      common._NOTIFICATIONS[answers.update].forEach(function (name) {
        state.config[name] = true;
      });
    }
    if (answers.servernames) {
      state.config._servernames = answers.servernames;
    }
    if (answers.ports) {
      state.config._ports = answers.ports;
    }

    // things that are straight-forward copy-over
    common.CONFIG_KEYS.forEach(function (key) {
      if ('true' === answers[key]) { answers[key] = true; }
      if ('false' === answers[key]) { answers[key] = false; }
      if ('null' === answers[key]) { answers[key] = null; }
      if ('undefined' === answers[key]) { delete answers[key]; }
      if ('undefined' !== typeof answers[key]) {
        state.config[key] = answers[key];
      }
    });

    askForConfig(state, function (err, state) {
      if (err) { parseCb(err); return; }

      if (!state.config.token && state._can_pair) {
        state.config._otp = common.otp();
      }

      parseCb(null, state);
    });
  }
};

require('fs').readFile(confpath, 'utf8', parseConfig);

}());