cli.js

// this is the cli file which the user will interact with

import readline from 'readline';
import { calculateBMI } from './bmi.js';

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

function prompt(question) {
    return new Promise((resolve) => rl.question(question, resolve));
}

async function main() {
    console.log("--- BMI Calculator ---");
    
    try {
        const feet = parseFloat(await prompt("Enter height (feet): "));
        const inches = parseFloat(await prompt("Enter height (inches): "));
        const weight = parseFloat(await prompt("Enter weight (pounds): "));

        // simple error handling
        if (isNaN(feet) || isNaN(inches) || isNaN(weight) || feet < 0 || inches < 0 || weight <= 0) {
            console.error("\nError: Please enter valid positive numbers. Weight must be greater than 0.");
            rl.close();
            return;
        }

        const result = calculateBMI(feet, inches, weight);

        console.log(`\nYour BMI: ${result.bmi}`);
        console.log(`Category: ${result.category}`);
    } catch (error) {
        console.error("Invalid input. Please enter numeric values.");
    } finally {
        rl.close();
    }
}

main();