document.addEventListener('DOMContentLoaded', () => {
    const startBtn = document.getElementById('start-mic-btn');
    const stopBtn = document.getElementById('stop-mic-btn');
    const clearBtn = document.getElementById('clear-btn');
    const serviceSelect = document.getElementById('service-select');
    const langSelect = document.getElementById('lang-select');
    const deeplKeyInput = document.getElementById('deepl-key');
    const deeplLabel = document.getElementById('deepl-label');

    const englishOutput = document.getElementById('english-output');
    const realtimeOutput = document.getElementById('realtime-output');
    const detailedOutput = document.getElementById('detailed-output');
    const statusLabel = document.getElementById('status-label');

    let isRecording = false;
    let audioContext;
    let processor;
    let eventSource = null;
    let lastEnglishText = ""; // Tamamlanmış son İngilizce metin
    let lastRealtimeText = ""; // Tamamlanmış son çeviri metni

    // DeepL API key girişini göster/gizle
    serviceSelect.addEventListener('change', (e) => {
        if (e.target.value === 'DeepL') {
            deeplKeyInput.style.display = 'inline-block';
            deeplLabel.style.display = 'inline-block';
        } else {
            deeplKeyInput.style.display = 'none';
            deeplLabel.style.display = 'none';
        }
    });

    // Ses verisini sunucuya gönderme
    function sendAudioToServer(data) {
        if (!isRecording) return;
        fetch('/upload_audio', {
            method: 'POST',
            body: data,
            headers: {
                'Content-Type': 'application/octet-stream'
            }
        }).catch(error => console.error('Error sending audio:', error));
    }
    
    // SSE bağlantısını başlat
    function startEventSource() {
        const params = new URLSearchParams({
            target_lang: langSelect.value,
            service: serviceSelect.value,
            deepl_key: deeplKeyInput.value
        });
        
        eventSource = new EventSource(`/stream_results?${params.toString()}`);
        
        eventSource.onmessage = (event) => {
            const data = JSON.parse(event.data);
            const asrText = data.english;
            const asrType = data.type;
            const translation = data.translation;
            
            if (asrType === "partial") {
                // Anlık İngilizce ve çeviri metnini güncelle
                englishOutput.textContent = lastEnglishText + asrText;
                realtimeOutput.textContent = lastRealtimeText + translation;

            } else if (asrType === "final") {
                // Final cümle geldiğinde alt satıra geç ve metinleri sakla
                lastEnglishText += asrText + "\n";
                lastRealtimeText += translation + "\n";

                // Detaylı çeviriye ekle
                detailedOutput.textContent += asrText + " --> " + translation + "\n";
                
                // Anlık çeviri kutusunu sıfırla
                englishOutput.textContent = lastEnglishText;
                realtimeOutput.textContent = lastRealtimeText;
            }
            englishOutput.scrollTop = englishOutput.scrollHeight;
            realtimeOutput.scrollTop = realtimeOutput.scrollHeight;
            detailedOutput.scrollTop = detailedOutput.scrollHeight;
        };
        
        eventSource.onerror = (err) => {
            console.error("EventSource hatası:", err);
            statusLabel.textContent = "🔴 Hata: Bağlantı kesildi!";
            statusLabel.style.color = "#ff453a";
            if (eventSource) eventSource.close();
            stopRecording();
        };
    }
    
    function stopEventSource() {
        if (eventSource) {
            eventSource.close();
            eventSource = null;
        }
    }

    // Olay Dinleyicileri
    startBtn.addEventListener('click', async () => {
        if (isRecording) return;
        isRecording = true;
        startBtn.style.display = 'none';
        stopBtn.style.display = 'block';
        statusLabel.textContent = "🟢 Kaydediyor...";
        statusLabel.style.color = "#30d158";
        
        // Metin alanlarını temizle
        englishOutput.textContent = "";
        realtimeOutput.textContent = "";
        detailedOutput.textContent = "";
        lastEnglishText = "";
        lastRealtimeText = "";

        try {
            const stream = await navigator.mediaDevices.getUserMedia({ audio: { sampleRate: 16000 } });
            audioContext = new (window.AudioContext || window.webkitAudioContext)({ sampleRate: 16000 });
            const source = audioContext.createMediaStreamSource(stream);
            
            const bufferSize = 4096;
            processor = audioContext.createScriptProcessor(bufferSize, 1, 1);
            
            source.connect(processor);
            processor.connect(audioContext.destination);

            processor.onaudioprocess = (e) => {
                if (!isRecording) return;
                const pcmData = e.inputBuffer.getChannelData(0);
                const pcm16 = new Int16Array(pcmData.length);
                for (let i = 0; i < pcmData.length; i++) {
                    pcm16[i] = Math.max(-1, Math.min(1, pcmData[i])) * 0x7FFF;
                }
                sendAudioToServer(pcm16.buffer);
            };

            await fetch('/start', { method: 'POST' });
            startEventSource();

        } catch (err) {
            console.error('Mikrofon erişimi reddedildi veya hata oluştu:', err);
            statusLabel.textContent = "🔴 Hata: Mikrofon erişimi reddedildi!";
            statusLabel.style.color = "#ff453a";
            isRecording = false;
            startBtn.style.display = 'block';
            stopBtn.style.display = 'none';
        }
    });

    stopBtn.addEventListener('click', () => {
        stopRecording();
    });

    function stopRecording() {
        if (!isRecording) return;
        isRecording = false;
        if (audioContext) {
            audioContext.close();
            audioContext = null;
        }
        
        startBtn.style.display = 'block';
        stopBtn.style.display = 'none';
        statusLabel.textContent = "🔴 Hazır - 'Başlat' butonuna basın";
        statusLabel.style.color = "#30d158";
        
        stopEventSource();
        fetch('/stop', { method: 'POST' });
    }

    clearBtn.addEventListener('click', () => {
        englishOutput.textContent = "";
        realtimeOutput.textContent = "";
        detailedOutput.textContent = "";
        lastEnglishText = "";
        lastRealtimeText = "";
        statusLabel.textContent = "🟢 Tüm veriler temizlendi.";
    });
});