'use strict';

var PromiseA;
try {
  PromiseA = require('bluebird');
} catch(e) {
  PromiseA = global.Promise;
}

// opts.approveDomains(options, certs, cb)
module.exports.create = function (opts) {
  // accept all defaults for greenlock.challenges, greenlock.store, greenlock.middleware
  if (!opts._communityPackage) {
    opts._communityPackage = 'greenlock-express.js';
  }

  function explainError(e) {
    console.error('Error:' + e.message);
    if ('EACCES' === e.errno) {
      console.error("You don't have prmission to access '" + e.address + ":" + e.port + "'.");
      console.error("You probably need to use \"sudo\" or \"sudo setcap 'cap_net_bind_service=+ep' $(which node)\"");
      return;
    }
    if ('EADDRINUSE' === e.errno) {
      console.error("'" + e.address + ":" + e.port + "' is already being used by some other program.");
      console.error("You probably need to stop that program or restart your computer.");
      return;
    }
    console.error(e.code + ": '" + e.address + ":" + e.port + "'");
  }

  function _listenHttp(plainPort) {
    if (!plainPort) { plainPort = 80; }
    var p = plainPort;
    var validHttpPort = (parseInt(p, 10) >= 0);
    if (!validHttpPort) { console.warn("'" + p + "' doesn't seem to be a valid port number for http"); }
    var plainServer = require('http').createServer(
      greenlock.middleware.sanitizeHost(greenlock.middleware(require('redirect-https')()))
    );
    var promise = new PromiseA(function (resolve) {
      plainServer.listen(p, function () {
        resolve(plainServer);
      }).on('error', function (e) {
        if (plainServer.listenerCount('error') < 2) {
          console.warn("Did not successfully create http server and bind to port '" + p + "':");
          explainError(e);
          process.exit(41);
        }
      });
    });
    promise.server = plainServer;
    return promise;
  }

  function _listenHttps(port) {
    if (!port) { port = 443; }

    var p = port;
    var validHttpsPort = (parseInt(p, 10) >= 0);
    var httpType;
    if (!validHttpsPort) { console.warn("'" + p + "' doesn't seem to be a valid port number for https"); }
    var https;
    try {
      https = require('spdy');
      greenlock.tlsOptions.spdy = { protocols: [ 'h2', 'http/1.1' ], plain: false };
      httpType = 'http2 (spdy/h2)';
    } catch(e) {
      https = require('https');
      httpType = 'https';
    }
    var server = https.createServer(
      greenlock.tlsOptions
    , greenlock.middleware.sanitizeHost(function (req, res) {
        try {
          greenlock.app(req, res);
        } catch(e) {
          console.error("[error] [greenlock.app] Your HTTP handler had an uncaught error:");
          console.error(e);
        }
      })
    );
    server.type = httpType;
    var promise = new PromiseA(function (resolve) {
      server.listen(p, function () {
        resolve(server);
      }).on('error', function (e) {
        if (server.listenerCount('error') < 2) {
          console.warn("Did not successfully create https server and bind to port '" + p + "':");
          explainError(e);
          process.exit(43);
        }
      });
    });
    promise.server = server;
    return promise;
  }

  var greenlock = require('greenlock').create(opts);

  opts.app = opts.app || function (req, res) {
    res.end("Hello, World!\nWith Love,\nGreenlock for Express.js");
  };

  opts.listen = function (plainPort, port, fn1, fn2) {
    var promises = [];
    var server;
    var plainServer;

    var fn;
    var fnPlain;
    if (fn2) {
      fn = fn2;
      fnPlain = fn1;
    } else {
      fn = fn1;
    }

    promises.push(_listenHttp(plainPort, !fnPlain));
    promises.push(_listenHttps(port, !fn));

    server = promises[1].server;
    plainServer = promises[0].server;

    PromiseA.all(promises).then(function () {
      // Report h2/https status
      if ('function' === typeof fn) {
        fn.apply(server);
      } else if (server.listenerCount('listening') < 2) {
        console.info("Success! Serving " + server.type + " on port '" + server.address().port + "'");
      }

      // Report plain http status
      if ('function' === typeof fnPlain) {
        fnPlain.apply(plainServer);
      } else if (!fn && plainServer.listenerCount('listening') < 2) {
        console.info("Success! Bound to port '" + plainServer.address().port
          + "' to handle ACME challenges and redirect to " + server.type);
      }
    });

    server.unencrypted = plainServer;
    return server;
  };


  return greenlock;
};