// Shared functions across the application

// Load recent calculations on homepage
document.addEventListener('DOMContentLoaded', function() {
    if (document.getElementById('recentCalculations')) {
        loadRecentCalculations();
    }
});

function loadRecentCalculations() {
    const calculations = JSON.parse(localStorage.getItem('pumpCalculations') || '[]');
    const tableBody = document.getElementById('recentCalculations');
    
    if (calculations.length === 0) {
        tableBody.innerHTML = '<tr><td colspan="6" class="py-4 text-center text-gray-400">No recent calculations found</td></tr>';
        return;
    }
    
    tableBody.innerHTML = calculations.slice(0, 5).map(calc => `
        <tr class="border-b border-slate-700 hover:bg-slate-700 transition-colors">
            <td class="py-3">${calc.date}</td>
            <td>${calc.type.charAt(0).toUpperCase() + calc.type.slice(1)}</td>
            <td>${calc.flowRate} m³/h</td>
            <td>${calc.head} m</td>
            <td>${calc.efficiency}</td>
            <td>
                <a href="calculator.html" class="text-primary hover:text-red-400 transition-colors">
                    <i data-feather="repeat" class="w-4 h-4"></i>
                </a>
            </td>
        </tr>
    `).join('');
    
    feather.replace();
}

// Theme toggle functionality
function toggleDarkMode() {
    const html = document.documentElement;
    html.classList.toggle('dark');
    localStorage.setItem('darkMode', html.classList.contains('dark'));
}

// Check for saved theme preference
if (localStorage.getItem('darkMode') === 'false') {
    document.documentElement.classList.remove('dark');
}

// Format numbers with units
function formatNumber(value, unit) {
    if (isNaN(value)) return '-';
    return `${parseFloat(value.toFixed(2))} ${unit}`;
}