// Recap Relay — operator-side credit-metered proxy in front of Gemini
// (and optionally a co-located Parakeet+Gemma setup).
//
// Two public endpoints:
//   POST /relay/transcribe   — audio → text (Gemini File API)
//   POST /relay/analyze      — text → topic sections JSON (Gemini Pro)
// Plus admin endpoints under /admin/* gated by an HTTP session cookie.

import express from "express";
import cors from "cors";
import cookieParser from "cookie-parser";
import path from "path";
import { fileURLToPath } from "url";

import { initConfig } from "./config.js";
import { initCredits } from "./credits.js";
import { initAuditLog } from "./audit-log.js";
import { initJobCredits } from "./job-credits.js";
import { initOutputStore } from "./output-store.js";
import {
  setupAdminAuthMiddleware,
  setupAdminAuthRoutes,
} from "./admin-auth.js";
import { transcribeRouter } from "./routes/transcribe.js";
import { transcribeUrlRouter } from "./routes/transcribe-url.js";
import { summarizeUrlRouter } from "./routes/summarize-url.js";
import { analyzeRouter } from "./routes/analyze.js";
import { ttsRouter } from "./routes/tts.js";
import { userTierRouter } from "./routes/user-tier.js";
import { healthRouter } from "./routes/health.js";
import { balanceRouter } from "./routes/balance.js";
import { policyRouter } from "./routes/policy.js";
import { capabilitiesRouter } from "./routes/capabilities.js";
import { creditsRouter } from "./routes/credits.js";
import { zapriteWebhookRouter } from "./routes/zaprite-webhook.js";
import { adminRouter } from "./routes/admin.js";
import { internalMeetingsRouter } from "./routes/internal-meetings.js";
import { adminTestRunRouter } from "./routes/admin-test-run.js";
import { btcpaySetupRouter } from "./routes/btcpay-setup.js";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

// DATA_DIR is /data on StartOS, project root in dev.
const DATA_DIR = process.env.DATA_DIR || path.join(__dirname, "..");
const PORT = parseInt(process.env.PORT || "3002", 10);

await initConfig({ dataDir: DATA_DIR });
await initCredits({ dataDir: DATA_DIR });
await initJobCredits({ dataDir: DATA_DIR });
await initAuditLog({ dataDir: DATA_DIR });
await initOutputStore({ dataDir: DATA_DIR });

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

// Admin auth must run BEFORE the admin routes register so the cookie
// check applies to /admin/usage, /admin/config, etc. /admin/login and
// /admin/status are explicitly exempted inside the middleware.
setupAdminAuthMiddleware(app);
setupAdminAuthRoutes(app);

// Public relay endpoints. No app-level auth — each route handler
// authenticates per-call via headers (X-Recap-Install-Id required,
// Authorization optional).
app.use("/relay", healthRouter());
app.use("/relay", policyRouter());
app.use("/relay", capabilitiesRouter());
app.use("/relay", balanceRouter());
app.use("/relay", transcribeRouter());
app.use("/relay", transcribeUrlRouter());
app.use("/relay", summarizeUrlRouter());
app.use("/relay", analyzeRouter());
app.use("/relay", ttsRouter());
app.use("/relay", userTierRouter());
app.use("/relay", creditsRouter());
app.use("/relay", zapriteWebhookRouter());

// Admin dashboard endpoints (cookie-gated).
app.use("/admin", adminRouter({ dataDir: DATA_DIR }));
app.use("/admin", adminTestRunRouter());
// One-click BTCPay setup wizard (uses admin auth for the start +
// stores + finalize endpoints; callback is admin-exempt and uses a
// state token instead — see btcpay-setup.js for the design notes).
app.use("/admin/btcpay", btcpaySetupRouter({ dataDir: DATA_DIR }));
// Internal team meeting upload + analysis (Path 2A — operator-only,
// admin-auth gated by the parent /admin prefix's middleware).
app.use(
  "/admin/internal-meetings",
  internalMeetingsRouter({ dataDir: DATA_DIR })
);

// Static admin UI (v0.2 will flesh out public/admin.html). For v0.1
// the dashboard is JSON-only; serve any static assets dropped into
// public/ but don't error if the directory is empty.
app.use(express.static(path.join(__dirname, "..", "public")));

// Root: send operators straight to the dashboard so the StartOS
// "Launch UI" button (which points at `/`) lands on something useful.
// The dashboard's JS handles the admin-auth gate — first hit shows the
// login form when an admin password is configured, then the dashboard
// itself. Recap clients only ever hit /relay/* paths, so this redirect
// doesn't affect them.
app.get("/", (_req, res) => {
  res.redirect("/dashboard.html");
});

// Error handler (must be last). Without it, body-parser parse failures
// and any other propagated error fall through to Express's default
// handler, which renders an HTML page including the local-filesystem
// stack trace — an info leak. Return clean JSON instead.
app.use((err, _req, res, next) => {
  if (res.headersSent) return next(err); // mid-stream (SSE) — can't rewrite
  if (err?.type === "entity.parse.failed") {
    return res.status(400).json({ error: "invalid JSON body" });
  }
  if (err?.type === "entity.too.large") {
    return res.status(413).json({ error: "request body too large" });
  }
  console.error("[relay] unhandled error:", err?.message || err);
  return res.status(500).json({ error: "internal error" });
});

const HOSTNAME = process.env.HOSTNAME || "0.0.0.0";
app.listen(PORT, HOSTNAME, () => {
  console.log(`[relay] listening on http://${HOSTNAME}:${PORT}`);
  console.log(`[relay] data directory: ${DATA_DIR}`);
});