var bcrypt = require('bcrypt');
const mongoose = require('mongoose');
const validator = require('validator');
const jwt = require('jsonwebtoken');
const _ = require('lodash');

const tools = require('../tools/general');

mongoose.Promise = global.Promise;

mongoose.level = "F";
// Resolving error Unknown modifier: $pushAll
mongoose.plugin(schema => { schema.options.usePushEach = true });

mongoose.set('debug', process.env.DEBUG);

var UserSchema = new mongoose.Schema({
  userId: {
    type: String,
  },
  email: {
    type: String,
    required: true,
    trim: true,
    minlength: 1,
    unique: true,
    /*validate: {
      validator: validator.isEmail,
      message: '{VALUE} is not a valid email'
    }*/
  },
  idapp: {
    type: Number,
    required: true,
  },
  username: {
    type: String,
    required: true,
    trim: true,
    minlength: 6,
    unique: true,
  },
  password: {
    type: String,
    require: true,
    minlength: 6,
  },
  lang: {
    type: String,
    require: true,
  },
  linkreg: {
    type: String,
    required: false
  },
  verified_email: {
    type: Boolean,
  },
  tokens: [{
    access: {
      type: String,
      required: true
    },
    browser: {
      type: String,
      required: true
    },
    token: {
      type: String,
      required: true
    },
    date_login: {
      type: Date
    },
  }],
  date_tokenforgot: {
    type: Date
  },
  tokenforgot: {
    type: String,
  },

});

UserSchema.methods.toJSON = function () {
  var user = this;
  var userObject = user.toObject();

  return _.pick(userObject, ['_id', 'email', 'verified_email', 'username', 'userId']);
};

UserSchema.methods.generateAuthToken = function (req) {
  // console.log("GENERA TOKEN : ");
  var user = this;

  const useragent = req.get('User-Agent');
  tools.mylog("GENERATE USER-AGENT = ", useragent);

  var access = 'auth';
  const browser = useragent;
  var token = jwt.sign({ _id: user._id.toHexString(), access }, process.env.SIGNCODE).toString();
  var date_login = new Date();

  // CANCELLA IL PRECEDENTE !
  user.tokens = user.tokens.filter(function(tok) { return (tok.access !== access) || ((tok.access === access)  && (tok.browser !== browser) ) ; });
  user.tokens.push({ access, browser, token, date_login });

  return user.save()
    .then(() => {
      console.log("TOKEN CREATO IN LOGIN : " + token);
      return token;
    })
    .catch(err => {
      console.log("Error", err.message);
    });
};

UserSchema.statics.findByToken = function (token, typeaccess) {
  var User = this;
  var decoded;

  try {
    decoded = jwt.verify(token, process.env.SIGNCODE);
  } catch (e) {
    return Promise.resolve(null);
  }

  return User.findOne({
    '_id': decoded._id,
    'tokens.token': token,
    'tokens.access': typeaccess,
  });
};

UserSchema.statics.findByTokenAnyAccess = function (token) {
  var User = this;
  var decoded;

  try {
    decoded = jwt.verify(token, process.env.SIGNCODE);
  } catch (e) {
    return Promise.resolve(null);
  }

  return User.findOne({
    '_id': decoded._id,
    'tokens.token': token,
  });
};

UserSchema.statics.findByCredentials = function (username, password) {
  var User = this;
  var pwd = "";

  return User.findOne({ username: username }).then((user) => {
    if (!user) {
      return null;
    }
    pwd = user.password;

    return new Promise((resolve, reject) => {
      // Use bcrypt.compare to compare password and user.password
      // console.log("pwd1 " + password);
      // console.log("pwd2 " + pwd);
      bcrypt.compare(password, pwd, (err, res) => {
        if (res) {
          resolve(user);
        } else {
          return resolve(null);
        }
      });
    });
  });
};


UserSchema.statics.findByUsername = function (username) {
  var User = this;

  return User.findOne({
    'username': username,
  });
};

UserSchema.statics.findByLinkreg = function (idapp, linkreg) {
  var User = this;

  return User.findOne({
    'linkreg': linkreg,
    'idapp': idapp,
  });
};

UserSchema.statics.findByLinkTokenforgot = function (idapp, email, tokenforgot) {
  var User = this;

  return User.findOne({
    'email': email,
    'tokenforgot': tokenforgot,
    'date_tokenforgot': { $gte: new Date(ISODate().getTime() - 1000 * 60 * 60 * 4) },  // 4 ore fa!
    'idapp': idapp,
  });
};


UserSchema.statics.findByEmail = function (email) {
  var User = this;

  return User.findOne({
    'email': email,
  });
};

UserSchema.pre('save', function (next) {
  var user = this;

  /*
  if (user.isModified('password')) {
    bcrypt.genSalt(10, (err, salt) => {
      bcrypt.hash(user.password, salt, (err, hash) => {
        user.password = hash;
        next();
      });
    });
  } else {
    next();
  }
  */
  next();
});

UserSchema.methods.removeToken = function (token) {
  var user = this;

  return user.update({
    $pull: {
      tokens: { token }
    }
  });
};


var User = mongoose.model('User', UserSchema);

class Hero {
  constructor(name, level) {
    this.name = name;
    this.level = level;
  }

  // Adding a method to the constructor
  greet() {
    return `${this.name} says hello.`;
  }
}


module.exports = { User, Hero };