import express from "express";
import path from "path";
import { fileURLToPath } from "url";
import { sessionsRouter } from "./routes/sessions.js";
import { exportRouter } from "./routes/export.js";

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

export function createApp() {
  const app = express();

  app.use(express.json({ limit: "50mb" }));

  app.get("/api/health", (_req, res) => {
    res.json({ status: "ok" });
  });

  app.use("/api/sessions", sessionsRouter);
  app.use("/api/export", exportRouter);

  // Serve static client files in production
  const clientDist = path.resolve(__dirname, "../../dist/client");
  app.use(express.static(clientDist));
  app.get("*", (_req, res) => {
    res.sendFile(path.join(clientDist, "index.html"));
  });

  return app;
}

export function startServer() {
  const PORT = parseInt(process.env.PORT || "3848", 10);
  const app = createApp();

  const server = app.listen(PORT, "127.0.0.1", async () => {
    console.log(`Session Viewer API running on http://localhost:${PORT}`);
    if (process.env.SESSION_VIEWER_OPEN_BROWSER === "1") {
      const { default: open } = await import("open");
      open(`http://localhost:${PORT}`);
    }
  });

  // Graceful shutdown so tsx watch can restart cleanly
  function shutdown() {
    server.close();
  }
  process.on("SIGINT", shutdown);
  process.on("SIGTERM", shutdown);

  return server;
}

// Only auto-start when run directly (not imported by tests)
const thisFile = fileURLToPath(import.meta.url);
const entryFile = process.argv[1];
if (entryFile && path.resolve(entryFile) === path.resolve(thisFile)) {
  startServer();
}