(function () {
    function init() {
        /* ---- refs ---- */
        const micBtn   = document.getElementById('lumi-mic-btn');
        if (!micBtn) return false;  // DOM chưa sẵn sàng, thử lại sau

        const recLabel = document.getElementById('lumi-rec-label');
        const canvas   = document.getElementById('lumi-canvas');
        const ctx2d    = canvas.getContext('2d');
        const procBar  = document.getElementById('lumi-proc-bar');
        const playWrap = document.getElementById('lumi-audio-playback');
        const audioEl  = document.getElementById('lumi-audio-el');

        /* ---- state ---- */
        let isRecording   = false;
        let mediaRecorder = null;
        let audioChunks   = [];
        let audioCtx      = null;
        let analyser      = null;
        let micStream     = null;
        let animId        = null;

        /* ---- mic button ---- */
        micBtn.addEventListener('click', () => {
            isRecording ? stopRecording() : startRecording();
        });

        /* ========================
           RECORDING
        ======================== */
        async function startRecording() {
            try {
                micStream = await navigator.mediaDevices.getUserMedia({ audio: true, video: false });
            } catch (e) {
                recLabel.textContent = '❌ Không có quyền truy cập micro!';
                return;
            }

            // Web Audio → visualizer
            audioCtx = new (window.AudioContext || window.webkitAudioContext)();
            analyser = audioCtx.createAnalyser();
            analyser.fftSize = 128;
            audioCtx.createMediaStreamSource(micStream).connect(analyser);

            // MediaRecorder → lưu blob
            audioChunks = [];
            const mime = ['audio/webm;codecs=opus', 'audio/webm', 'audio/ogg']
                .find(t => MediaRecorder.isTypeSupported(t)) || '';
            mediaRecorder = new MediaRecorder(micStream, mime ? { mimeType: mime } : {});
            mediaRecorder.ondataavailable = e => { if (e.data.size > 0) audioChunks.push(e.data); };
            mediaRecorder.onstop = onRecordingDone;
            mediaRecorder.start(100);

            isRecording = true;
            micBtn.classList.add('recording');
            micBtn.textContent = '⏹️';
            recLabel.textContent = '🔴 Đang ghi... Nhấn để dừng';
            recLabel.classList.add('recording');
            playWrap.style.display = 'none';
            procBar.style.display  = 'none';
            drawWave();
        }

        function stopRecording() {
            if (mediaRecorder && mediaRecorder.state !== 'inactive') mediaRecorder.stop();
            if (micStream)  micStream.getTracks().forEach(t => t.stop());
            if (audioCtx)   audioCtx.close();
            if (animId)     cancelAnimationFrame(animId);
            micStream = audioCtx = analyser = null;

            isRecording = false;
            micBtn.classList.remove('recording');
            micBtn.textContent = '🎙️';
            recLabel.textContent = 'Nhấn để ghi âm lại';
            recLabel.classList.remove('recording');
            procBar.style.display = 'block';
            drawFlatLine();
        }

        function onRecordingDone() {
            const mime = audioChunks[0]?.type || 'audio/webm';
            const blob = new Blob(audioChunks, { type: mime });

            // Playback
            const url = URL.createObjectURL(blob);
            audioEl.src = url;
            audioEl.oncanplay = () => {
                procBar.style.display  = 'none';
                playWrap.style.display = 'flex';
            };

            injectFileToGradio(blob, mime);
        }

        /* ========================
           INJECT VÀO GRADIO
        ======================== */
        function injectFileToGradio(blob, mime) {
            const ext  = mime.includes('ogg') ? 'ogg' : 'webm';
            const file = new File([blob], 'recording.' + ext, { type: mime });

            function attempt(tries) {
                const inp = document.querySelector('.hidden-audio-wrap input[type="file"]');
                if (inp) {
                    const dt = new DataTransfer();
                    dt.items.add(file);
                    inp.files = dt.files;
                    inp.dispatchEvent(new Event('change', { bubbles: true }));
                } else if (tries > 0) {
                    setTimeout(() => attempt(tries - 1), 300);
                }
            }
            attempt(10);
        }

        /* ========================
           WAVEFORM VISUALIZER
        ======================== */
        function drawWave() {
            if (!analyser) return;
            animId = requestAnimationFrame(drawWave);

            const buf  = analyser.frequencyBinCount;
            const data = new Uint8Array(buf);
            analyser.getByteTimeDomainData(data);

            const W = canvas.width, H = canvas.height;
            ctx2d.clearRect(0, 0, W, H);

            const rms       = Math.sqrt(data.reduce((s, v) => s + (v - 128) ** 2, 0) / buf);
            const intensity = Math.min(rms / 28, 1);

            // Glow rings
            if (intensity > 0.04) {
                const cx = W / 2, cy = H / 2;
                [0, 1, 2].forEach(r => {
                    ctx2d.beginPath();
                    ctx2d.arc(cx, cy, 16 + r * 13 + intensity * 18, 0, Math.PI * 2);
                    ctx2d.strokeStyle = `rgba(167,139,250,${(0.20 - r * 0.05) * intensity})`;
                    ctx2d.lineWidth   = 9 - r * 2.5;
                    ctx2d.stroke();
                });
            }

            // Waveform
            const g = ctx2d.createLinearGradient(0, 0, W, 0);
            g.addColorStop(0,   'rgba(124,111,247,0)');
            g.addColorStop(0.2, `rgba(124,111,247,${0.45 + intensity * 0.55})`);
            g.addColorStop(0.5, `rgba(167,139,250,${0.75 + intensity * 0.25})`);
            g.addColorStop(0.8, `rgba(56,189,248,${0.45 + intensity * 0.55})`);
            g.addColorStop(1,   'rgba(56,189,248,0)');

            ctx2d.beginPath();
            ctx2d.lineWidth   = 2.5;
            ctx2d.strokeStyle = g;
            ctx2d.shadowColor = '#7c6ff7';
            ctx2d.shadowBlur  = 10 * intensity;

            const sw = W / buf;
            for (let i = 0; i < buf; i++) {
                const y = ((data[i] / 128) * H) / 2;
                i === 0 ? ctx2d.moveTo(0, y) : ctx2d.lineTo(i * sw, y);
            }
            ctx2d.stroke();
            ctx2d.shadowBlur = 0;
        }

        function drawFlatLine() {
            ctx2d.clearRect(0, 0, canvas.width, canvas.height);
            ctx2d.beginPath();
            ctx2d.moveTo(0, canvas.height / 2);
            ctx2d.lineTo(canvas.width, canvas.height / 2);
            ctx2d.strokeStyle = 'rgba(124,111,247,0.18)';
            ctx2d.lineWidth   = 1.5;
            ctx2d.stroke();
        }

        drawFlatLine(); // init
        return true;
    }

    /* ========================
       ĐỢI DOM SẴN SÀNG
       Thử init ngay, nếu chưa được thì
       MutationObserver sẽ thử lại mỗi khi DOM thay đổi
    ======================== */
    if (!init()) {
        const observer = new MutationObserver(() => {
            if (init()) observer.disconnect();
        });
        observer.observe(document.body, { childList: true, subtree: true });
    }
})();