Build an AI chatbot

// Run as soon as the SDK is ready. If window.vos already
// exists, start now; otherwise wait for the one-shot event.
window.addEventListener("vos-ready", loadHistory);
if (window.vos) loadHistory();

const HISTORY_FILE = "history.json";
let sandboxPath = "home/.apps"; // replaced by getInfo()
let messages = [];              // user/assistant turns only

async function loadHistory() {
  try {
    // getInfo() returns the private sandbox path — no prompt.
    const info = await window.vos.app.getInfo();
    if (info && info.sandboxPath) sandboxPath = info.sandboxPath;

    const raw = await window.vos.fs.readFile(sandboxPath, HISTORY_FILE);
    if (raw) {
      const parsed = JSON.parse(raw);
      if (Array.isArray(parsed)) {
        messages = parsed.filter(
          (m) => m && (m.role === "user" || m.role === "assistant")
            && typeof m.content === "string"
        );
      }
    }
  } catch (e) {
    /* first run — no file yet, start empty */
  }
  renderAll();
}

// The system prompt steers tone; it is NEVER persisted.
const SYSTEM = {
  role: "system",
  content: "You are Simple AI Chatbot, a thoughtful, concise assistant.",
};

async function send(text) {
  messages.push({ role: "user", content: text });

  // Show a typing indicator while the model thinks.
  const typingBubble = bubble("assistant");
  typingBubble.innerHTML = '<div class="typing"><span></span><span></span><span></span></div>';

  try {
    // window.vos.ai.chat() takes the full message array and
    // returns the assistant's reply. No API key, no endpoint —
    // the host routes it through the VibeOS AI gateway.
    const payload = [SYSTEM, ...messages];
    const reply = await window.vos.ai.chat(payload);
    const out = (typeof reply === "string" ? reply : JSON.stringify(reply)).trim();

    messages.push({ role: "assistant", content: out || "(no response)" });
    typingBubble.innerHTML = renderMarkdown(out);
    persist();
  } catch (err) {
    typingBubble.innerHTML =
      '<span style="color:#FCA5A5">Something went wrong: ' + err.message + "</span>";
  }
}

let saveTimer = null;

// Debounce writes so each reply doesn't block on the filesystem.
function persist() {
  clearTimeout(saveTimer);
  saveTimer = setTimeout(async () => {
    try {
      await window.vos.fs.writeFile(
        sandboxPath,
        HISTORY_FILE,
        JSON.stringify(messages)
      );
    } catch (e) { /* ignore transient write errors */ }
  }, 250);
}