// DNS Things - Theme and UI Utilities

// Theme toggle functionality
function initTheme() {
    const themeToggleBtn = document.getElementById('theme-toggle');
    const lightIcon = document.getElementById('theme-toggle-light-icon');
    const darkIcon = document.getElementById('theme-toggle-dark-icon');

    if (!themeToggleBtn || !lightIcon || !darkIcon) return;

    // Check for saved theme preference or default to system preference
    const savedTheme = localStorage.getItem('theme');
    const systemPrefersDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
    
    let currentTheme = savedTheme || (systemPrefersDark ? 'dark' : 'light');
    
    // Apply initial theme
    if (currentTheme === 'dark') {
        document.documentElement.classList.add('dark');
        lightIcon.classList.add('hidden');
        darkIcon.classList.remove('hidden');
    } else {
        document.documentElement.classList.remove('dark');
        lightIcon.classList.remove('hidden');
        darkIcon.classList.add('hidden');
    }

    // Toggle theme function
    function toggleTheme() {
        if (document.documentElement.classList.contains('dark')) {
            document.documentElement.classList.remove('dark');
            lightIcon.classList.remove('hidden');
            darkIcon.classList.add('hidden');
            localStorage.setItem('theme', 'light');
        } else {
            document.documentElement.classList.add('dark');
            lightIcon.classList.add('hidden');
            darkIcon.classList.remove('hidden');
            localStorage.setItem('theme', 'dark');
        }
    }

    themeToggleBtn.addEventListener('click', toggleTheme);
}

// Tab descriptions for dynamic updates
const tabDescriptions = {
    'dns-lookup-tab': 'Perform DNS lookups to resolve domain names and check DNS records',
    'reverse-dns-tab': 'Find domain names associated with IP addresses using reverse DNS',
    'whois-tab': 'Get detailed registration and ownership information for domains and IPs',
    'punycode-tab': 'Convert international domain names between Unicode and Punycode formats',
    'ip-tools-tab': 'Comprehensive IP address utilities including validation, conversion, and analysis'
};

// Tab switching functionality
function initTabs() {
    const tabButtons = document.querySelectorAll('.tab-btn');
    const tabContents = document.querySelectorAll('.tab-content');
    const descriptionElement = document.querySelector('p.text-lg.text-gray-500.mt-2');
    
    tabButtons.forEach(button => {
        button.addEventListener('click', () => {
            const targetTab = button.getAttribute('data-tab');
            
            // Remove active class from all buttons and contents
            tabButtons.forEach(btn => {
                btn.classList.remove('active', 'text-indigo-600', 'dark:text-indigo-400', 'bg-white', 'dark:bg-gray-800', 'shadow');
                btn.classList.add('text-gray-600', 'dark:text-gray-300', 'hover:bg-white', 'hover:dark:bg-gray-800/50');
            });
            tabContents.forEach(content => {
                content.classList.remove('active');
                content.classList.add('hidden');
            });
            
            // Add active class to clicked button and show corresponding content
            button.classList.remove('text-gray-600', 'dark:text-gray-300', 'hover:bg-white', 'hover:dark:bg-gray-800/50');
            button.classList.add('active', 'text-indigo-600', 'dark:text-indigo-400', 'bg-white', 'dark:bg-gray-800', 'shadow');
            
            const targetContent = document.getElementById(targetTab);
            if (targetContent) {
                targetContent.classList.remove('hidden');
                targetContent.classList.add('active');
            }
            
            // Update description text
            if (descriptionElement && tabDescriptions[targetTab]) {
                descriptionElement.textContent = tabDescriptions[targetTab];
            }
        });
    });
    
    // Set initial description based on active tab
    const activeTab = document.querySelector('.tab-btn.active');
    if (activeTab && descriptionElement) {
        const activeTabId = activeTab.getAttribute('data-tab');
        if (tabDescriptions[activeTabId]) {
            descriptionElement.textContent = tabDescriptions[activeTabId];
        }
    }
}

// Copy to clipboard functionality
function copyToClipboard(text, button) {
    if (navigator.clipboard && window.isSecureContext) {
        navigator.clipboard.writeText(text).then(() => {
            showCopyFeedback(button);
        }).catch(err => {
            console.error('Failed to copy: ', err);
            fallbackCopyTextToClipboard(text, button);
        });
    } else {
        fallbackCopyTextToClipboard(text, button);
    }
}

// Make copyToClipboard globally available
window.copyToClipboard = copyToClipboard;

function fallbackCopyTextToClipboard(text, button) {
    const textArea = document.createElement('textarea');
    textArea.value = text;
    textArea.style.position = 'fixed';
    textArea.style.left = '-999999px';
    textArea.style.top = '-999999px';
    document.body.appendChild(textArea);
    textArea.focus();
    textArea.select();
    
    try {
        document.execCommand('copy');
        showCopyFeedback(button);
    } catch (err) {
        console.error('Fallback: Oops, unable to copy', err);
    }
    
    document.body.removeChild(textArea);
}

function showCopyFeedback(button) {
    const originalHTML = button.innerHTML;
    button.innerHTML = `
        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7"></path>
        </svg>
    `;
    button.classList.add('bg-green-500');
    
    setTimeout(() => {
        button.innerHTML = originalHTML;
        button.classList.remove('bg-green-500');
    }, 1000);
}

// Initialize copy buttons for the original HTML structure
function initCopyButtons() {
    document.querySelectorAll('.copy-btn').forEach(button => {
        button.addEventListener('click', function(e) {
            e.preventDefault();
            const targetId = this.getAttribute('data-copy-target');
            const targetElement = document.getElementById(targetId);
            const copyIcon = this.querySelector('.copy-icon');
            const copyFeedback = this.querySelector('.copy-feedback');
            
            if (targetElement) {
                const textToCopy = targetElement.textContent.trim();
                
                // Skip if text is loading or not available
                if (!textToCopy || textToCopy === 'loading...' || textToCopy === 'Not available') {
                    return;
                }
                
                // Try to use the modern clipboard API
                if (navigator.clipboard && window.isSecureContext) {
                    navigator.clipboard.writeText(textToCopy).then(() => {
                        showCopyFeedback(copyIcon, copyFeedback);
                    }).catch(err => {
                        console.error('Failed to copy: ', err);
                        fallbackCopyTextToClipboard(textToCopy, copyIcon, copyFeedback);
                    });
                } else {
                    // Fallback for older browsers
                    fallbackCopyTextToClipboard(textToCopy, copyIcon, copyFeedback);
                }
            }
        });
    });
}

function showCopyFeedback(copyIcon, copyFeedback) {
    if (copyIcon) copyIcon.classList.add('hidden');
    if (copyFeedback) copyFeedback.classList.remove('hidden');
    
    setTimeout(() => {
        if (copyIcon) copyIcon.classList.remove('hidden');
        if (copyFeedback) copyFeedback.classList.add('hidden');
    }, 2000);
}