// DNS Things - Whois Module

// Initialize Whois lookup form
function initWhoisForm() {
    const form = document.getElementById('whois-form');
    const input = document.getElementById('whois-input');
    const results = document.getElementById('whois-results');
    const loader = document.getElementById('whois-loader');

    if (!form || !input || !results || !loader) return;

    form.addEventListener('submit', async (e) => {
        e.preventDefault();
        
        const domain = input.value.trim();
        if (!domain) return;

        // Show loader
        loader.classList.remove('hidden');
        results.innerHTML = '';

        try {
            // Use DNS-based domain information lookup as a free alternative
            const recordTypes = ['A', 'AAAA', 'MX', 'TXT', 'NS', 'SOA'];
            
            const queries = recordTypes.map(type => 
                fetch(`https://dns.google/resolve?name=${encodeURIComponent(domain)}&type=${type}`)
                    .then(response => response.json())
                    .then(data => ({ type, data }))
                    .catch(error => ({ type, error }))
            );

            const responses = await Promise.all(queries);
            
            // Process DNS data
            const dnsData = {};
            const ipAddresses = { ipv4: [], ipv6: [] };
            
            responses.forEach(({ type, data, error }) => {
                if (!error && data.Answer && data.Answer.length > 0) {
                    dnsData[type] = data.Answer.map(record => record.data);
                    
                    if (type === 'A') {
                        ipAddresses.ipv4.push(...data.Answer.map(record => record.data));
                    } else if (type === 'AAAA') {
                        ipAddresses.ipv6.push(...data.Answer.map(record => record.data));
                    }
                }
            });

            // Determine TLD registry
            const tld = domain.split('.').pop().toLowerCase();
            const tldRegistries = {
                'com': 'Verisign',
                'net': 'Verisign', 
                'org': 'Public Interest Registry (PIR)',
                'info': 'Afilias',
                'biz': 'NeuStar',
                'name': 'Verisign',
                'mobi': 'Afilias',
                'travel': 'Tralliance',
                'museum': 'MuseDoma',
                'coop': 'DotCooperation',
                'aero': 'SITA',
                'pro': 'RegistryPro',
                'edu': 'Educause',
                'gov': 'General Services Administration',
                'mil': 'DoD Network Information Center',
                'int': 'IANA'
            };

            // Build results
            let resultsHTML = '<div class="space-y-4">';
            
            // Domain Information
            resultsHTML += `
                <div class="p-4 bg-blue-50 dark:bg-blue-900/30 rounded-lg">
                    <h4 class="font-semibold text-blue-800 dark:text-blue-200 mb-3">Domain Information</h4>
                    <div class="grid grid-cols-1 md:grid-cols-2 gap-4 text-sm">
                        <div>
                            <div><strong>Domain:</strong> ${domain}</div>
                            <div><strong>TLD Registry:</strong> ${tldRegistries[tld] || 'Unknown'}</div>
                            <div><strong>Website:</strong> ${dnsData.A || dnsData.AAAA ? '✅ Available' : '❌ Not available'}</div>
                            <div><strong>Email:</strong> ${dnsData.MX ? '✅ Supported' : '❌ Not supported'}</div>
                        </div>
                        <div class="text-xs text-blue-600 dark:text-blue-400">
                            <p><strong>Note:</strong> This is a DNS-based lookup providing practical domain information. For detailed registration data, use official whois services.</p>
                        </div>
                    </div>
                </div>
            `;

            // Name Servers
            if (dnsData.NS) {
                resultsHTML += `
                    <div class="p-4 bg-white dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700">
                        <h4 class="font-semibold text-gray-800 dark:text-white mb-3">Name Servers (${dnsData.NS.length})</h4>
                        <ul class="space-y-1">
                `;
                dnsData.NS.forEach(ns => {
                    const cleanNS = ns.replace(/\.$/, '');
                    resultsHTML += `
                        <li class="flex justify-between items-center p-2 bg-gray-50 dark:bg-gray-700 rounded">
                            <span class="font-mono text-sm">${cleanNS}</span>
                            <button onclick="copyToClipboard('${cleanNS}', this)" class="p-1 text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200" title="Copy">
                                <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="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path>
                                </svg>
                            </button>
                        </li>
                    `;
                });
                resultsHTML += '</ul></div>';
            }

            // DNS Records Summary
            resultsHTML += `
                <div class="p-4 bg-white dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700">
                    <h4 class="font-semibold text-gray-800 dark:text-white mb-3">DNS Records Summary</h4>
                    <div class="grid grid-cols-2 md:grid-cols-4 gap-2">
            `;
            
            recordTypes.forEach(type => {
                const hasRecord = dnsData[type] && dnsData[type].length > 0;
                resultsHTML += `
                    <div class="text-center p-2 rounded ${hasRecord ? 'bg-green-100 dark:bg-green-900/30 text-green-800 dark:text-green-200' : 'bg-gray-100 dark:bg-gray-700 text-gray-500 dark:text-gray-400'}">
                        <div class="font-semibold">${type}</div>
                        <div class="text-sm">${hasRecord ? '✅' : '❌'}</div>
                    </div>
                `;
            });
            
            resultsHTML += '</div></div>';

            // IP Addresses
            if (ipAddresses.ipv4.length > 0 || ipAddresses.ipv6.length > 0) {
                resultsHTML += `
                    <div class="p-4 bg-white dark:bg-gray-800 rounded-lg border border-gray-200 dark:border-gray-700">
                        <h4 class="font-semibold text-gray-800 dark:text-white mb-3">IP Addresses</h4>
                        <div class="space-y-2">
                `;
                
                ipAddresses.ipv4.forEach(ip => {
                    resultsHTML += `
                        <div class="flex justify-between items-center">
                            <span class="whois-badge ipv4">${ip}</span>
                            <button onclick="copyToClipboard('${ip}', this)" class="p-1 text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200" title="Copy">
                                <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="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path>
                                </svg>
                            </button>
                        </div>
                    `;
                });
                
                ipAddresses.ipv6.forEach(ip => {
                    resultsHTML += `
                        <div class="flex justify-between items-center">
                            <span class="whois-badge ipv6">${ip}</span>
                            <button onclick="copyToClipboard('${ip}', this)" class="p-1 text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200" title="Copy">
                                <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="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path>
                                </svg>
                            </button>
                        </div>
                    `;
                });
                
                resultsHTML += '</div></div>';
            }

            resultsHTML += '</div>';
            results.innerHTML = resultsHTML;

        } catch (error) {
            console.error('Whois lookup error:', error);
            results.innerHTML = `
                <div class="p-4 bg-red-50 dark:bg-red-900/30 text-red-700 dark:text-red-300 rounded-lg">
                    <h3 class="font-medium mb-1">Error</h3>
                    <p class="text-sm">Failed to lookup domain information. Please try again.</p>
                </div>
            `;
        } finally {
            loader.classList.add('hidden');
        }
    });

    // Auto-submit on paste
    input.addEventListener('paste', () => {
        setTimeout(() => {
            if (input.value.trim()) {
                form.dispatchEvent(new Event('submit'));
            }
        }, 100);
    });
}