(function () {

    const $ = (q, c = document) => c.querySelector(q);
    const $$ = (q, c = document) => Array.from(c.querySelectorAll(q));
    const setTheme = (t) => { document.documentElement.setAttribute('data-theme', t); try { localStorage.setItem('theme', t) } catch { } };
    const toast = (msg) => {
        const el = $('#toast'); if (!el) return;
        el.textContent = msg; el.classList.add('show');
        clearTimeout(el._t); el._t = setTimeout(() => el.classList.remove('show'), 2000);
    };
    const host = () => `${location.protocol}//${location.host}`;

    function buildLink(url, ip) {
        if (!url || !ip) return '';
        try {
            const enc = encodeURIComponent(url);
            const ipClean = (ip || '').trim();
            return `${host()}/convert?url=${enc}&ip=${encodeURIComponent(ipClean)}`;
        } catch { return ''; }
    }

    document.addEventListener('click', (e) => {
        const t = e.target.closest('[data-action="toggle-theme"]');
        if (t) {
            e.preventDefault();
            const cur = document.documentElement.getAttribute('data-theme') || 'dark';
            setTheme(cur === 'dark' ? 'light' : 'dark');
        }
    });

    const urlInput = $('#url-input');
    const ipInput = $('#ip-input');
    const ipPreset = $('#ip-preset');
    const out = $('#generated-link');
    const openBtn = $('#open-link');

    function updatePreview() {
        const link = buildLink(urlInput.value.trim(), ipInput.value.trim());
        out.value = link || '';
        if (link) {
            openBtn.setAttribute('href', link);
            openBtn.setAttribute('aria-disabled', 'false');
        } else {
            openBtn.setAttribute('href', '#');
            openBtn.setAttribute('aria-disabled', 'true');
        }
        $('.result-box')?.setAttribute('data-state', link ? 'ready' : 'empty');
    }

    ['input', 'change', 'blur'].forEach(evt => {
        urlInput?.addEventListener(evt, updatePreview);
        ipInput?.addEventListener(evt, updatePreview);
    });

    ipPreset?.addEventListener('change', () => {
        const v = ipPreset.value;
        if (!v) return;
        if (v !== 'custom') ipInput.value = v;
        ipInput.focus();
        updatePreview();
    });

    document.addEventListener('click', (e) => {
        let t = e.target;

        if (t.closest('[data-action="copy"]')) {
            e.preventDefault();
            const btn = t.closest('[data-action="copy"]');
            const sel = btn.getAttribute('data-target') || '#generated-link';
            const el = $(sel);
            if (!el) return;
            const text = el.value || el.textContent || '';
            navigator.clipboard?.writeText(text).then(() => {
                btn.classList.add('copied'); setTimeout(() => btn.classList.remove('copied'), 1200);
                toast('Link copied');
            }).catch(() => {
                // Fallback
                const range = document.createRange(); range.selectNodeContents(el);
                const selObj = getSelection(); selObj.removeAllRanges(); selObj.addRange(range);
                try { document.execCommand('copy'); toast('Link copied'); } catch { }
                selObj.removeAllRanges();
            });
        }

        if (t.closest('[data-action="copy-text"]')) {
            e.preventDefault();
            const btn = t.closest('[data-action="copy-text"]');
            const text = btn.getAttribute('data-text') || '';
            if (!text) return;
            navigator.clipboard?.writeText(text).then(() => toast('Copied'));
        }

        if (t.closest('[data-action="clear"]')) {
            e.preventDefault();
            urlInput.value = '';

            updatePreview();
            urlInput.focus();
        }

        if (t.closest('[data-action="collapse"]')) {
            e.preventDefault();
            const btn = t.closest('[data-action="collapse"]');
            const panel = $('#' + (btn.getAttribute('aria-controls') || ''));
            if (!panel) return;
            const expanded = btn.getAttribute('aria-expanded') === 'true';
            btn.setAttribute('aria-expanded', expanded ? 'false' : 'true');
            panel.style.display = expanded ? 'none' : '';
        }
    });

    function showError(input, msg) {
        const id = input.getAttribute('id');
        const box = document.querySelector(`.error[data-error-for="${id}"]`);
        if (box) box.textContent = msg || '';
        input.setAttribute('aria-invalid', msg ? 'true' : 'false');
    }

    urlInput?.addEventListener('blur', () => {
        const v = urlInput.value.trim();
        if (!v) return showError(urlInput, '');
        try { new URL(v); showError(urlInput, ''); }
        catch { showError(urlInput, 'Invalid URL'); }
    });

    ipInput?.addEventListener('blur', () => {
        const v = ipInput.value.trim();
        if (!v) return showError(ipInput, '');
        const ok = /^\b\d{1,3}(?:\.\d{1,3}){3}\b$/.test(v);
        showError(ipInput, ok ? '' : 'Invalid IPv4 address');
    });


    (function init() {
        const serverLink = out?.value?.trim();
        if (serverLink) {
            $('.result-box')?.setAttribute('data-state', 'ready');
            openBtn?.setAttribute('aria-disabled', 'false');
        } else {
            updatePreview();
        }
    })();

    document.addEventListener('keydown', (e) => {
        if ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 'c') {
            const text = out?.value?.trim(); if (!text) return;
            navigator.clipboard?.writeText(text).then(() => toast('Link copied'));
        }
    });
})();

function updateThemeColor() {
    const meta = document.querySelector('meta[name="theme-color"]');
    if (!meta) return;
    const isLight = document.documentElement.getAttribute('data-theme') === 'light';
    meta.setAttribute('content', isLight ? '#f6f8fb' : '#0f1115');
}

const _setTheme = setTheme;
setTheme = function (t) { _setTheme(t); updateThemeColor(); };
document.addEventListener('DOMContentLoaded', updateThemeColor);