document.addEventListener('DOMContentLoaded', function() {
    const claimForm = document.getElementById('claim-form');
    const subdomainInput = document.getElementById('subdomain');
    const availabilityStatus = document.getElementById('availability-status');
    const claimBtn = document.getElementById('claim-btn');
    const claimSection = document.getElementById('claim-section');
    const successSection = document.getElementById('success-section');
    const errorSection = document.getElementById('error-section');
    const routerConfig = document.getElementById('router-config');

    let checkTimeout = null;

    subdomainInput.addEventListener('input', function() {
        const value = this.value.toLowerCase().replace(/[^a-z0-9-]/g, '');
        this.value = value;

        clearTimeout(checkTimeout);
        availabilityStatus.textContent = '';
        availabilityStatus.className = 'status';
        claimBtn.disabled = true;

        if (value.length >= 3) {
            checkTimeout = setTimeout(() => checkAvailability(value), 300);
        }
    });

    async function checkAvailability(subdomain) {
        try {
            const response = await fetch(`/api/check?subdomain=${encodeURIComponent(subdomain)}`);
            const data = await response.json();

            if (data.available) {
                availabilityStatus.textContent = '✓ Available';
                availabilityStatus.className = 'status available';
                claimBtn.disabled = false;
            } else {
                availabilityStatus.textContent = '✗ Already taken';
                availabilityStatus.className = 'status taken';
                claimBtn.disabled = true;
            }
        } catch (error) {
            console.error('Error checking availability:', error);
        }
    }

    claimForm.addEventListener('submit', async function(e) {
        e.preventDefault();
        const subdomain = subdomainInput.value;

        claimBtn.disabled = true;
        claimBtn.textContent = 'Claiming...';

        try {
            const response = await fetch('/api/claim', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({ subdomain: subdomain }),
            });

            const data = await response.json();

            if (response.ok) {
                showSuccess(data);
            } else {
                showError(data.error || 'Failed to claim space');
            }
        } catch (error) {
            showError('Network error. Please try again.');
        }

        claimBtn.disabled = false;
        claimBtn.textContent = 'Claim Space';
    });

    function showSuccess(data) {
        claimSection.classList.add('hidden');
        successSection.classList.remove('hidden');
        routerConfig.classList.remove('hidden');

        document.getElementById('token-value').textContent = data.token;
        document.getElementById('fqdn-value').textContent = data.fqdn;

        const updateUrl = `https://dyn.${data.fqdn.split('.').slice(-2).join('.')}/api/nic/update?hostname=%h&myip=%i`;
        document.getElementById('update-url').textContent = updateUrl;

        document.querySelectorAll('.hostname-placeholder').forEach(el => {
            el.textContent = data.fqdn;
        });

        document.querySelectorAll('.update-url-placeholder').forEach(el => {
            el.textContent = updateUrl;
        });

        const curlCmd = `curl -u "none:${data.token}" "https://dyn.${data.fqdn.split('.').slice(-2).join('.')}/api/nic/update?hostname=${data.fqdn}"`;
        document.getElementById('curl-example').textContent = curlCmd;

        document.getElementById('copy-token').addEventListener('click', function() {
            copyToClipboard(data.token);
            this.textContent = 'Copied!';
            setTimeout(() => this.textContent = 'Copy Token', 2000);
        });

        document.getElementById('copy-curl').addEventListener('click', function() {
            copyToClipboard(curlCmd);
            this.textContent = 'Copied!';
            setTimeout(() => this.textContent = 'Copy', 2000);
        });
    }

    function showError(message) {
        claimSection.classList.add('hidden');
        errorSection.classList.remove('hidden');
        document.getElementById('error-message').textContent = message;
    }

    document.getElementById('try-again').addEventListener('click', function() {
        errorSection.classList.add('hidden');
        claimSection.classList.remove('hidden');
        subdomainInput.value = '';
        subdomainInput.focus();
    });

    function copyToClipboard(text) {
        navigator.clipboard.writeText(text).catch(function() {
            const textarea = document.createElement('textarea');
            textarea.value = text;
            document.body.appendChild(textarea);
            textarea.select();
            document.execCommand('copy');
            document.body.removeChild(textarea);
        });
    }
});