index.js

// npm init -y
//nm install chalk@4.1.2 inquire
//nexado script "start: node index.js" na package.json

//modulos externos
const inquirer = require('inquirer')
const chalk = require('chalk')

//modulos internos
const fs = require('fs')

operation ()

function operation() {

    inquirer.prompt([
    {
        type: 'list',
        name: 'action',
        message: 'O que voce deseja fazer?',
        choices :  ['Criar Conta','Consultar Saldo','Depositar','Sacar','Emprestimo','Sair'],
    },
])
.then((answer) =>{
    const action = answer['action']

    if(action === 'Criar Conta'){
        createAccount()
    
    }else{ if ( action ==='Depositar'){
        deposit()
    
    }else if(action === 'Consultar Saldo'){
      getAccountBalance()  
    }else if(action === 'Sacar') {
        widthdraw()
    
    }else if(action === 'Emprestimo'){
        loan()  

    }else if(action === 'Sair'){
       console.log(chalk.bgBlue.black('Obrigado por usar o Accounts!')) 
       process.exit() 

    }
    }
})
.catch((err) => console.log(err))
}

//CREATE ACCOUNT
function createAccount(){
    console.log(chalk.bgGreen.black('Parabens por escolher o nosso banco!'))
    console.log(chalk.green('Defina as opcoes da sua conta a seguir'))

    buildAccount()
}

function buildAccount(){

    inquirer.prompt([
       {
        name: 'accountName',
        message: 'Digite um nome para sua conta:',
       },
    ])
    .then((answer) =>{
        const accountName = answer['accountName']
        
        console.info(accountName)

        if(!fs.existsSync('accounts')){
            fs.mkdirSync('accounts')
        }
        if (fs.existsSync(`accounts/${accountName}.json`)){

            console.log(chalk.bgRed.black(`Esta conta ja existe, escolha outro nome!`),
            )
            buildAccount()
            return
        }
        fs.writeFileSync(
            `accounts/${accountName}.json`,
            '{"balance": 0}',
            function (err){
                console.log(err)
            },
        )
        
        console.log(chalk.green('Parabens, a sua conta foi criada'))

        operation()

    })
    .catch((err) => console.log(err))
}
 
    //depositar dinheoro na conta do usuario
    function deposit(){
    
        inquirer.prompt([
            {
                name: 'accountName',
                message: 'Qual o nome da sua conta?',
            },
        ])
        .then((answer) => {
            const accountName = answer['accountName']
            //verificando se a conta existe - verify if account exists
            if(!checkAccount(accountName)){
                return deposit()
            }

            inquirer.prompt([
                {
                name: 'amount',
                message: 'Quanto voce deseja depositar?',    
                },  
            ]).then((answer) => {
                const amount = answer['amount']

                //add an amount
                addAmount(accountName, amount)
                operation()
            })
            .catch(err => console.log(err))
        })
        .catch(err => console.log(err))
    }

    function checkAccount(accountName){
        if(!fs.existsSync(`accounts/${accountName}.json`)){
        console.log(chalk.bgRed.black('Esta conta nao existe, escolha outro nome!'))
        return false 
    }

    return true 
}

function addAmount(accountName, amount){
    const accountData = getAccount(accountName)

    if(!amount){
        console.log('Ocorreu um erro, tente novamente mais tarde!')
        return deposit()
    }

    accountData.balance = parseFloat(amount) + parseFloat(accountData.balance)
    fs.writeFileSync(
        `accounts/${accountName}.json`,
        JSON.stringify(accountData),
        function (err){
            console.log(err)
        },
    )
        console.log(
            chalk.green(`Foi depositado o valor de R$${amount}na sua conta`),
        )   
    
}

function getAccount (accountName){
    const accountJSON =  fs.readFileSync(`accounts/${accountName}.json`,{
        encoding: 'utf8',
        flag: 'r',
    })

    return JSON.parse(accountJSON)
}
// show account balance
function getAccountBalance(){
    inquirer.prompt([
        {
            name:'accountName',
            message:'Qual o nome da sua conta?',
        },
    ]).then((answer) =>{

        const accountName = answer['accountName']
        //verify if account exists
        if (!checkAccount(accountName)){
            return getAccountBalance()
        }

        const accountData = getAccount(accountName)

        console.log(chalk.bgBlue.black(
            `Ola, o saldo da sua conta e de $${accountData.balance}`
            ),
        )
        operation()

    }).catch(err => console.log(err))
}
// withdraw an amount from user account
function widthdraw(){
    inquirer.prompt([
        {
           name: 'accountName',
           message: 'Qual o nome da sua conta?',
        },
    ]).then((answer) =>{
        const accountName = answer['accountName']
        if(!checkAccount(accountName)){
            return widthdraw()
        }

        inquirer.prompt([
            {
                name: 'amount',
                message: 'Quanto voce deseja sacar?',
            },

        ]).then((answer) => {
            const amount = answer['amount']

            removeAmount(accountName, amount)
            
        })
        .catch((err) => console.log(err))
    })
    .catch(err => console.log(err))    
}

function removeAmount(accountName, amount){
  const accountData = getAccount(accountName)

  if(!amount){
      console.log(
          chalk.bgRed.black('Ocorreu um erro, tente novamete mais tarde!'),
      )
      return widthdraw()
  }
  if(accountData.balance < amount){
      console.log(chalk.bgRed.black('Valor indisponivel!'))
      return widthdraw
  }
  accountData.balance = parseFloat(accountData.balance) - parseFloat(amount)

  fs.writeFileSync(
      `accounts/${accountName}.json`,
      JSON.stringify(accountData),
      function (err) {
          console.log(err)
      },
  )
  console.log(
      chalk.green(`Foi realizado um saque com de ${amount} da sua conta!`)
  )
  operation()
}

function loan(){
    inquirer.prompt([
        {
           name: 'accountName',
           message: 'Qual o nome da sua conta?',
        },
    ]).then((answer) =>{
        const accountName = answer['accountName']
        if(!checkAccount(accountName)){
            return loan()
        }
        inquirer.prompt([
            {
            name: 'amount',
            message: 'Quanto voce deseja emprestado?',    
            },  
        ]).then((answer) => {
            const amount = answer['amount']

            //add an amount
            addAmount(accountName, amount)
            operation()
        })
        .catch(err => console.log(err))
        
    })
    .catch(err => console.log(err))    
}