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

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

const shared_consts = require('../tools/shared_nodejs');
const queryclass = require('../classes/queryclass');

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: false,
    /*validate: {
      validator: validator.isEmail,
      message: '{VALUE} is not a valid email'
    }*/
  },
  cell: {
    type: String,
  },
  idapp: {
    type: String,
    required: true,
  },
  username: {
    type: String,
    required: true,
    trim: true,
    minlength: 6,
    unique: false,
  },
  name: {
    type: String,
    trim: true,
  },
  surname: {
    type: String,
    trim: 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
    },
  }],
  perm: {
    type: Number
  },
  img: {
    type: String
  },
  ipaddr: {
    type: String,
  },
  date_reg: {
    type: Date,
    default: Date.now()
  },
  date_tokenforgot: {
    type: Date
  },
  tokenforgot: {
    type: String,
  },
  lasttimeonline: {
    type: Date
  }

});

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

  return _.pick(userObject, ['_id', ...shared_consts.fieldsUserToChange()]);
};

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

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

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

  user.lasttimeonline = new Date();

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

UserSchema.statics.setPermissionsById = function (id, perm) {
  const user = this;

  return user.findByIdAndUpdate(id, { $set: { perm } }).then((user) => {
    if (user)
      return res.send({ code: server_constants.RIS_CODE_OK, msg: '' });
    else
      return res.send({ code: server_constants.RIS_CODE_ERR, msg: '' });
  });

};

UserSchema.statics.isAdmin = function (user) {
  try {
    return ((user.perm & shared_consts.Permissions.Admin) === shared_consts.Permissions.Admin);
  } catch (e) {
    return false
  }
};

UserSchema.statics.isManager = function (user) {
  try {
    return ((user.perm & shared_consts.Permissions.Manager) === shared_consts.Permissions.Manager);
  } catch (e) {
    return false
  }
};

UserSchema.statics.findByToken = function (token, typeaccess) {
  const User = this;
  let 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 (idapp, username, password) {
  var User = this;
  var pwd = "";

  return User.findOne({ idapp, username: username }).then((user) => {
    if (!user) {
      // Check if with email:
      return User.findOne({ idapp, email: username })
    } else {
      return user
    }
  }).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 (idapp, username) {
  const User = this;

  return User.findOne({
    'idapp': idapp,
    '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 (idapp, email) {
  var User = this;

  return User.findOne({
    'idapp': idapp,
    '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) {
  const user = this;

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

UserSchema.statics.getEmailByUsername = async function (idapp, username) {
  const User = this;

  return await User.findOne({ idapp, username })
    .then((arrrec) => {
      return ((arrrec) ? arrrec.email : '');
    }).catch((e) => {
      console.error('getEmailByUsername', e);
    });
};


UserSchema.statics.getUsersList = function (idapp) {
  const User = this;

  return User.find({ 'idapp': idapp }, {
    username: 1,
    name: 1,
    surname: 1,
    verified_email: 1,
    perm: 1,
    email: 1,
    date_reg: 1,
    img: 1
  })

};


UserSchema.statics.getUsersListByParams = function (params) {
  const User = this;

  myclParamQuery = new queryclass.CParamsQuery(params);

  const filterMatchBefore = `${ myclParamQuery.filter }`;

  return User.find(
    { $match: filterMatchBefore },
    { 'idapp': idapp },
    { username: 1, name: 1, surname: 1, verified_email: 1, perm: 1, email: 1, date_reg: 1, img: 1, lasttimeonline: 1 })

};

/**
 * Query blog posts by user -> paginated results and a total count.
 * @returns {Object} Object -> `{ rows, count }`
 */

UserSchema.statics.getFieldsForSearch = function () {
  return ['name', 'surname', 'email', 'cell']
};

UserSchema.statics.executeQueryTable = function (idapp, params) {
  params.fieldsearch = this.getFieldsForSearch();
  return tools.executeQueryTable(this, idapp, params);
};

if (tools.INITDB_FIRSTIME) {
  console.log('   createIndex User Index...');
  // UserSchema.index({ username: 'text', name: 'text', surname: 'text', email: 'text' });
  // UserSchema.index({ name: 'name' });
  // UserSchema.index({ name: 1 });
  // UserSchema.index({ surname: 1 });
}

const 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 };