const conversation = document.querySelector("#conversation");
const statusDot = document.querySelector("#statusDot");
const statusText = document.querySelector("#statusText");
const textInput = document.querySelector("#textInput");
const sendButton = document.querySelector("#sendButton");
const voiceButton = document.querySelector("#voiceButton");
const voiceLabel = document.querySelector("#voiceLabel");
const resetButton = document.querySelector("#resetButton");
const audioToggle = document.querySelector("#audioToggle");

const sessionId = getSessionId();
let recorder = null;
let chunks = [];
let isRecording = false;
let audioUnlocked = false;

if ("serviceWorker" in navigator) {
  navigator.serviceWorker.register("/sw.js").catch(() => {});
}

sendButton.addEventListener("click", sendText);
voiceButton.addEventListener("click", toggleVoice);
resetButton.addEventListener("click", resetConversation);
textInput.addEventListener("keydown", (event) => {
  if (event.key === "Enter" && !event.shiftKey) {
    event.preventDefault();
    sendText();
  }
});

function getSessionId() {
  const key = "opensquared_assistant_session";
  let value = localStorage.getItem(key);
  if (!value) {
    if (window.crypto && typeof window.crypto.randomUUID === "function") {
      value = window.crypto.randomUUID();
    } else {
      value = `session-${Date.now()}-${Math.random().toString(16).slice(2)}`;
    }
    localStorage.setItem(key, value);
  }
  return value;
}

function setStatus(text, mode = "idle") {
  statusText.textContent = text;
  statusDot.classList.toggle("live", mode === "live");
  statusDot.classList.toggle("error", mode === "error");
}

function addBubble(text, role = "assistant") {
  const bubble = document.createElement("article");
  bubble.className = `bubble ${role}`;
  bubble.textContent = text;
  conversation.appendChild(bubble);
  conversation.scrollTop = conversation.scrollHeight;
  return bubble;
}

async function unlockAudio() {
  if (audioUnlocked) return;
  try {
    const AudioContext = window.AudioContext || window.webkitAudioContext;
    if (AudioContext) {
      const context = new AudioContext();
      if (context.state === "suspended") {
        await context.resume();
      }
      await context.close();
    }
  } catch {
    // The click itself is enough to authorize later playback in most browsers.
  }
  audioUnlocked = true;
}

async function sendText() {
  const text = textInput.value.trim();
  if (!text) return;

  textInput.value = "";
  addBubble(text, "user");
  setStatus("Analyse en cours", "live");

  try {
    const response = await fetch("/api/chat", {
      method: "POST",
      headers: {"Content-Type": "application/json"},
      body: JSON.stringify({
        sessionId,
        text,
        withAudio: audioToggle.checked,
      }),
    });
    const data = await response.json();
    if (!response.ok) throw new Error(data.error || "Erreur serveur");
    await handleAssistantResponse(data);
  } catch (error) {
    addBubble(error.message, "error");
    setStatus("Erreur", "error");
  }
}

async function toggleVoice() {
  setStatus("Activation du micro", "live");
  await unlockAudio();

  if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
    addBubble("Le micro n'est pas disponible dans ce navigateur. Ouvre l'app en HTTPS avec Chrome.", "error");
    setStatus("Micro indisponible", "error");
    return;
  }

  if (typeof MediaRecorder === "undefined") {
    addBubble("L'enregistrement audio n'est pas supporte par ce navigateur.", "error");
    setStatus("Enregistrement indisponible", "error");
    return;
  }

  if (isRecording) {
    recorder.stop();
    return;
  }

  try {
    const stream = await navigator.mediaDevices.getUserMedia({audio: true});
    const mimeType = pickMimeType();
    recorder = new MediaRecorder(stream, mimeType ? {mimeType} : undefined);
    chunks = [];

    recorder.ondataavailable = (event) => {
      if (event.data.size) chunks.push(event.data);
    };

    recorder.onstop = async () => {
      stream.getTracks().forEach((track) => track.stop());
      isRecording = false;
      voiceButton.classList.remove("recording");
      voiceLabel.textContent = "Demarrer";
      await sendVoiceBlob(new Blob(chunks, {type: recorder.mimeType || "audio/webm"}));
    };

    recorder.start();
    isRecording = true;
    voiceButton.classList.add("recording");
    voiceLabel.textContent = "Stop";
    setStatus("Je t'ecoute", "live");
  } catch (error) {
    addBubble("Micro indisponible : " + error.message, "error");
    setStatus("Micro indisponible", "error");
  }
}

function pickMimeType() {
  const types = ["audio/webm;codecs=opus", "audio/webm", "audio/ogg;codecs=opus"];
  return types.find((type) => MediaRecorder.isTypeSupported(type)) || "";
}

async function sendVoiceBlob(blob) {
  addBubble("Message vocal envoye", "user");
  setStatus("Transcription", "live");

  const form = new FormData();
  const extension = blob.type.includes("ogg") ? "ogg" : "webm";
  form.append("sessionId", sessionId);
  form.append("audio", blob, `voice.${extension}`);

  try {
    const response = await fetch("/api/voice", {method: "POST", body: form});
    const data = await response.json();
    if (!response.ok) throw new Error(data.error || "Erreur serveur");
    if (data.transcript) addBubble(data.transcript, "user");
    await handleAssistantResponse(data);
  } catch (error) {
    addBubble(error.message, "error");
    setStatus("Erreur", "error");
  }
}

async function handleAssistantResponse(data) {
  addBubble(data.reply || "", "assistant");
  setStatus(data.emailSent ? "Email envoye" : "Pret", data.emailSent ? "live" : "idle");

  if (audioToggle.checked && data.audioUrl) {
    try {
      const audio = new Audio(data.audioUrl);
      await audio.play();
    } catch {
      addBubble("Audio pret, mais le navigateur a bloque la lecture automatique.", "error");
    }
  }
}

async function resetConversation() {
  await fetch("/api/reset", {
    method: "POST",
    headers: {"Content-Type": "application/json"},
    body: JSON.stringify({sessionId}),
  }).catch(() => {});
  conversation.innerHTML = "";
  addBubble("Nouvelle conversation. Je t'ecoute.", "assistant");
  setStatus("Conversation reinitialisee", "live");
}