// Theme switching functionality
document.querySelectorAll(‘.theme-color’).forEach(color => {
color.addEventListener(‘click’, function() {
const theme = this.getAttribute(‘data-theme’);
document.body.className = theme;
});
});

// Password length slider
const passwordLength = document.getElementById(‘passwordLength’);
const lengthValue = document.getElementById(‘lengthValue’);

passwordLength.addEventListener(‘input’, function() {
lengthValue.textContent = this.value;
});

// BMI system toggle
document.querySelectorAll(‘input[name=”bmiSystem”]’).forEach(radio => {
radio.addEventListener(‘change’, function() {
if (this.value === ‘metric’) {
document.getElementById(‘metricInputs’).style.display = ‘block’;
document.getElementById(‘imperialInputs’).style.display = ‘none’;
} else {
document.getElementById(‘metricInputs’).style.display = ‘none’;
document.getElementById(‘imperialInputs’).style.display = ‘block’;
}
});
});

// Set current date as default for age calculator
document.getElementById(‘currentDate’).valueAsDate = new Date();

// Tool Functions

// Word Counter
function countWords() {
const text = document.getElementById(‘wordCounterText’).value;
const words = text.trim() ? text.trim().split(/s+/).length : 0;
const characters = text.length;
const charactersNoSpaces = text.replace(/s/g, ”).length;
const sentences = text.split(/[.!?]+/).filter(s => s.length > 0).length;
const paragraphs = text.split(/ns*n/).filter(p => p.trim().length > 0).length;
const readingTime = Math.ceil(words / 200);

document.getElementById(‘wordCount’).textContent = words;
document.getElementById(‘charCount’).textContent = characters;
document.getElementById(‘charCountNoSpaces’).textContent = charactersNoSpaces;
document.getElementById(‘sentenceCount’).textContent = sentences;
document.getElementById(‘paragraphCount’).textContent = paragraphs;
document.getElementById(‘readingTime’).textContent = `${readingTime} minute${readingTime !== 1 ? ‘s’ : ”}`;

document.getElementById(‘wordCounterResults’).classList.add(‘show’);
}

// Percentage Calculator
function calculatePercentage() {
const value = parseFloat(document.getElementById(‘percentageValue’).value);
const total = parseFloat(document.getElementById(‘percentageTotal’).value);

if (isNaN(value) || isNaN(total) || total === 0) {
alert(‘Please enter valid numbers’);
return;
}

const percentage = (value / total) * 100;

document.getElementById(‘percentageResult’).textContent = `${percentage.toFixed(2)}%`;
document.getElementById(‘percentageExplanation’).textContent =
`${value} is ${percentage.toFixed(2)}% of ${total}`;

document.getElementById(‘percentageResults’).classList.add(‘show’);
}

// Age Calculator
function calculateAge() {
const birthDate = new Date(document.getElementById(‘birthDate’).value);
const currentDate = document.getElementById(‘currentDate’).value ?
new Date(document.getElementById(‘currentDate’).value) : new Date();

if (isNaN(birthDate.getTime())) {
alert(‘Please enter a valid birth date’);
return;
}

let years = currentDate.getFullYear() – birthDate.getFullYear();
let months = currentDate.getMonth() – birthDate.getMonth();
let days = currentDate.getDate() – birthDate.getDate();

if (days < 0) {
months–;
const prevMonth = new Date(currentDate.getFullYear(), currentDate.getMonth(), 0);
days += prevMonth.getDate();
}

if (months < 0) {
years–;
months += 12;
}

const totalDays = Math.floor((currentDate – birthDate) / (1000 * 60 * 60 * 24));

document.getElementById('ageResult').textContent = `${years} years, ${months} months, ${days} days`;
document.getElementById('ageDetails').textContent =
`Total days: ${totalDays.toLocaleString()} | Total months: ${(years * 12 + months).toLocaleString()}`;

document.getElementById('ageResults').classList.add('show');
}

// Password Generator
function generatePassword() {
const length = parseInt(document.getElementById('passwordLength').value);
const includeUppercase = document.getElementById('includeUppercase').checked;
const includeNumbers = document.getElementById('includeNumbers').checked;
const includeSymbols = document.getElementById('includeSymbols').checked;

const lowercase = 'abcdefghijklmnopqrstuvwxyz';
const uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
const numbers = '0123456789';
const symbols = '!@#$%^&*()_+-=[]{}|;:,.?’;

let chars = lowercase;
if (includeUppercase) chars += uppercase;
if (includeNumbers) chars += numbers;
if (includeSymbols) chars += symbols;

let password = ”;
for (let i = 0; i = 12 && includeUppercase && includeNumbers && includeSymbols) {
strength = ‘Very Strong’;
} else if (length >= 10 && includeUppercase && includeNumbers) {
strength = ‘Strong’;
} else if (length >= 8 && (includeUppercase || includeNumbers)) {
strength = ‘Medium’;
}

document.getElementById(‘passwordResult’).textContent = password;
document.getElementById(‘passwordStrength’).textContent = `Password Strength: ${strength}`;
document.getElementById(‘passwordResults’).classList.add(‘show’);
}

function copyPassword() {
const password = document.getElementById(‘passwordResult’).textContent;
navigator.clipboard.writeText(password).then(() => {
alert(‘Password copied to clipboard!’);
});
}

// Unit Converter
function convertUnits() {
const value = parseFloat(document.getElementById(‘unitValue’).value);
const from = document.getElementById(‘unitFrom’).value;
const to = document.getElementById(‘unitTo’).value;

if (isNaN(value)) {
alert(‘Please enter a valid number’);
return;
}

// Conversion factors to meters
const factors = {
cm: 0.01,
m: 1,
km: 1000,
inch: 0.0254,
ft: 0.3048,
mi: 1609.34
};

const result = (value * factors[from]) / factors[to];

document.getElementById(‘unitResult’).textContent = `${result.toFixed(4)} ${to}`;
document.getElementById(‘unitExplanation’).textContent =
`${value} ${from} = ${result.toFixed(4)} ${to}`;

document.getElementById(‘unitResults’).classList.add(‘show’);
}

// BMI Calculator
function calculateBMI() {
const system = document.querySelector(‘input[name=”bmiSystem”]:checked’).value;
let weight, height, bmi;

if (system === ‘metric’) {
weight = parseFloat(document.getElementById(‘metricWeight’).value);
height = parseFloat(document.getElementById(‘metricHeight’).value) / 100; // Convert cm to m
bmi = weight / (height * height);
} else {
weight = parseFloat(document.getElementById(‘imperialWeight’).value);
const feet = parseFloat(document.getElementById(‘imperialHeightFt’).value);
const inches = parseFloat(document.getElementById(‘imperialHeightIn’).value);
height = (feet * 12) + inches; // Convert to total inches
bmi = (weight / (height * height)) * 703;
}

if (isNaN(weight) || isNaN(height) || height === 0) {
alert(‘Please enter valid measurements’);
return;
}

let category, recommendation;

if (bmi < 18.5) {
category = 'Underweight';
recommendation = 'Consider consulting a healthcare provider for weight gain advice.';
} else if (bmi < 25) {
category = 'Normal weight';
recommendation = 'Maintain your current weight with a balanced diet and regular exercise.';
} else if (bmi < 30) {
category = 'Overweight';
recommendation = 'Consider moderate weight loss through diet and exercise.';
} else {
category = 'Obese';
recommendation = 'Consult a healthcare provider for weight management advice.';
}

document.getElementById('bmiValue').textContent = bmi.toFixed(1);
document.getElementById('bmiCategory').textContent = `Category: ${category}`;
document.getElementById('bmiRecommendation').textContent = recommendation;

document.getElementById('bmiResults').classList.add('show');
}