import express from "express";
import dotenv from "dotenv";
import cors from "cors";

dotenv.config();

const app = express();
app.use(cors());
app.use(express.json());

const PORT = Number(process.env.PORT || 7078);

// core endpoints
const CORTEX_REASON = process.env.CORTEX_REASON_URL || "http://cortex:7081/reason";
const CORTEX_INGEST = process.env.CORTEX_INGEST_URL || "http://cortex:7081/ingest";
const INTAKE_URL    = process.env.INTAKE_URL       || "http://intake:7082/summary";

// -----------------------------------------------------
// Helper request wrapper
// -----------------------------------------------------
async function postJSON(url, data) {
  const resp = await fetch(url, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(data),
  });

  const raw = await resp.text();
  let json;

  try {
    json = raw ? JSON.parse(raw) : null;
  } catch (e) {
    throw new Error(`Non-JSON from ${url}: ${raw}`);
  }

  if (!resp.ok) {
    throw new Error(json?.detail || json?.error || raw);
  }

  return json;
}

// -----------------------------------------------------
// HEALTHCHECK
// -----------------------------------------------------
app.get("/_health", (_, res) => {
  res.json({ ok: true });
});

// -----------------------------------------------------
// MAIN ENDPOINT (new canonical)
// -----------------------------------------------------
app.post("/chat", async (req, res) => {
  try {
    const session_id = req.body.session_id || "default";
    const user_msg   = req.body.message || "";

    console.log(`Relay → received: "${user_msg}"`);

    // 1. → Cortex.reason
    let reason;
    try {
      reason = await postJSON(CORTEX_REASON, {
        session_id,
        user_prompt: user_msg
      });
    } catch (e) {
      console.error("Relay → Cortex.reason error:", e.message);
      return res.status(500).json({ error: "cortex_reason_failed", detail: e.message });
    }

    const persona = reason.final_output || reason.persona || "(no persona text)";

    // 2. → Cortex.ingest
    postJSON(CORTEX_INGEST, {
      session_id,
      user_msg,
      assistant_msg: persona
    }).catch(e => console.warn("Relay → Cortex.ingest failed:", e.message));

    // 3. → Intake summary
    postJSON(INTAKE_URL, {
      session_id,
      user_msg,
      assistant_msg: persona
    }).catch(e => console.warn("Relay → Intake failed:", e.message));

    // 4. → Return to UI
    return res.json({
      session_id,
      reply: persona
    });

  } catch (err) {
    console.error("Relay fatal:", err);
    res.status(500).json({
      error: "relay_failed",
      detail: err.message || String(err)
    });
  }
});

// -----------------------------------------------------
app.listen(PORT, () => {
  console.log(`Relay is online on port ${PORT}`);
});