module.exports = function(chatserver, keyserver) {

  var package = require(__dirname+'/../package.json')
  var config = require(package.path.config)
  var io = require('socket.io-client')
  var openpgp = require('openpgp')
  openpgp.initWorker()
  openpgp.config.aead_protect = true
    
  var module = function() {
    var _hkp = new openpgp.HKP(keyserver)
    var _user = null
    
    this.login = function(user, password, success, fail) {
      _user = user
      _hkp.lookup({query: _user.email}).then(function(key) {
        var data = (new Date()).toLocaleString()+' '+_user.name+' '+_user.email
        console.log('data:', data)
        var pubkeys = openpgp.key.readArmored(key)
        var privkey = openpgp.key.readArmored(_user.key.priv).keys[0]
        privkey.decrypt(password)
        if (pubkeys.keys.length==1) {
          openpgp.encrypt({
            data: data,
            publicKeys: pubkeys.keys[0],
            privateKeys: privkey
          }).then(function(ciphertext) {
            openpgp.decrypt({
              message: openpgp.message.readArmored(ciphertext.data),
              publicKeys: openpgp.key.readArmored(_user.key.pub).keys[0],
              privateKey: privkey
            }).then(function(plaintext) {
              if (data==plaintext.data) {
                success(_user)
              } else {
                fail('local key does not match key on server')
              }
            }).catch(function(e) {
              fail('decryption failed', e)
            })
          }).catch(function(e) {
            fail('encryption failed', e)
          })
        } else {
          fail('more than one public key on server', pubkeys.keys)
        }
      }).catch(function(e) {
        fail('check key on server failed', e)
      })
    }
    
    this.create = function(name, host, password, success, fail) {
      var _this = this
      openpgp.generateKey({
        numBits: 4096,
        userIds: [{name: name, email: name+'@'+host}],
        passphrase: password
      }).then(function(key) {
        _user = {
          name: name,
          email: name+'@'+host,
          numBits: 4096,
          key: {
            pub: key.publicKeyArmored,
            priv: key.privateKeyArmored
          }
        }
        _hkp.upload(_user.key.pub).then(function() {
          console.log('key successfully uploaded')
          _this.login(_user, password, success, fail)
        }).catch(function(e) {
          fail('upload key failed', e)
        })
      }).catch(function(e) {
        fail('generating key pairs failed', e)
      })
    }
    
  }

  return new module();
  
}