cli.js

// CPF Payroll Calculator

const readline = require('readline');

const CPF_RATES = {
    '<55': { employee: 0.2, employer: 0.17 },
    '55-60': { employee: 0.13, employer: 0.13 },
    '60-65': { employee: 0.075, employer: 0.09 },
    '>65': { employee: 0.05, employer: 0.075 },
};

const getAgeGroup = (age) => {
    if (age < 55) return '<55';
    if (age >= 55 && age < 60) return '55-60';
    if (age >= 60 && age < 65) return '60-65';
    return '>65';
};

const calculateCPF = (salary, age, isCitizen = true) => {
    if (!isCitizen) return { employeeCPF: 0, employerCPF: 0, totalCPF: 0 };

    const ageGroup = getAgeGroup(age);
    const rates = CPF_RATES[ageGroup];

    const employeeCPF = salary * rates.employee;
    const employerCPF = salary * rates.employer;
    const totalCPF = employeeCPF + employerCPF;

    return { employeeCPF, employerCPF, totalCPF };
};

const calculatePayroll = (grossSalary, age, isCitizen, additionalPayments = 0) => {
    const totalSalary = grossSalary + additionalPayments;
    const { employeeCPF, employerCPF, totalCPF } = calculateCPF(totalSalary, age, isCitizen);

    const netSalary = totalSalary - employeeCPF;

    return {
        grossSalary,
        additionalPayments,
        totalSalary,
        employeeCPF,
        employerCPF,
        totalCPF,
        netSalary,
    };
};

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});

const getEmployeeData = () => {
    rl.question('Enter employee name: ', (name) => {
        rl.question('Enter gross salary: ', (grossSalaryInput) => {
            const grossSalary = parseFloat(grossSalaryInput);

            rl.question('Enter age: ', (ageInput) => {
                const age = parseInt(ageInput, 10);

                rl.question('Is the employee a Singapore Citizen? (yes/no): ', (isCitizenInput) => {
                    const isCitizen = isCitizenInput.toLowerCase() === 'yes';

                    rl.question('Enter additional payments (if any): ', (additionalPaymentsInput) => {
                        const additionalPayments = parseFloat(additionalPaymentsInput) || 0;

                        const payroll = calculatePayroll(grossSalary, age, isCitizen, additionalPayments);
                        console.log(`Payroll for ${name}:`, payroll);

                        rl.question('Do you want to calculate payroll for another employee? (yes/no): ', (anotherInput) => {
                            if (anotherInput.toLowerCase() === 'yes') {
                                getEmployeeData();
                            } else {
                                rl.close();
                            }
                        });
                    });
                });
            });
        });
    });
};

getEmployeeData();

module.exports = { calculateCPF, calculatePayroll };