'use strict';

// This class is used for logins
class Login {
  constructor(hash) {
    this.sessions = [];
    this.users = [];
    this.passwords = [];
    Object.keys(hash).map(k => ({k, v: hash[k]})).map(e => {
      this.users = this.users.concat([e.k]);
      this.passwords = this.passwords.concat([e.v]);
    });
  }

      login(user, password) {
        if (this.userExists(user)) {
            if (this.checkPassword(user, password)) {
                this.sessions.push(user);
                console.log("Login success!");
            } else {
                console.error('Error password incorrect!');
            }
        } else {
            console.error("Error, usuario: " + user + " no existe!");
        }
        //console.log(this.sessions);
    }

    logout(user) {

        if (this.userExists(user)) {
            let index = this.sessions.indexOf(user);
            if (index != -1) {
                this.sessions.splice(index, 1);
                console.log("Logout success!");
            } else {
                console.error("Error, user:" + user + " no está logeado!");
            }
        } else {
            console.error("Error, usuario no existe!");
        }
    }

  // Usuario existe?
   userExists(user) {
        return (this.users.indexOf(user) != -1);
    }

  // Register user
  registerUser(user, password) {
    let lastIndex = this.users.length;
    this.users[lastIndex] = user;
    this.passwords[lastIndex] = password;
  }

  removeUser(user) {
    let index = this.idx(user, this.users);
    this.users[index] = null;
    this.passwords[index] = null;
    this.users = this.users.filter(user => user !== null);
    this.passwords = this.passwords.filter(password => password !== null);
  }

    checkPassword(user, password) {
        let index = this.users.indexOf(user);
        return this.passwords[index] === password;
    }

      updatePassword(user, oldPassword, newPassword) {
        // Primero vemos si usuario existe
        let index = this.users.indexOf(user);
        if (index !== -1) {
            if (this.passwords[index] === oldPassword) {
                this.passwords[index] = newPassword;
                console.log("Password updated!");
            }else{
                console.error("Error, clave no coincide!")
            }
        } else {
            console.error("Error, usuario: " + user + " no existe!");
        }
    }
}

  // Gets index of an element in an array
  idx(element, array) {
    let cont=0;
    for (let i of array) {
      if (i === element) {
        return cont;
      }
      cont += 1;
    }
    return cont;
  }
}

let registeredUsers = {
  user1: 'pass1',
  user2: 'pass2',
  user3: 'pass3'
};

let login = new Login(registeredUsers);

login.registerUser('user4', 'pass4');
login.login('user4', 'pass4');
login.updatePassword('user3', 'pass3', 'pass5');
login.login('user3', 'pass5');
login.logout('user4');
login.logout('user3');