const express = require("express");
const cors = require("cors");
require("dotenv").config();

const { log } = require("./lib/log");
const { friendlyErrorMessage } = require("./lib/errors");
const { reportError, reportUnhandled } = require("./lib/report-error");
const { ensureScheduleStopProgressTable } = require("./lib/schema");

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

process.on("uncaughtException", (err) => reportUnhandled("uncaughtException", err));
process.on("unhandledRejection", (reason) => reportUnhandled("unhandledRejection", reason));

app.use((req, res, next) => {
  const originalJson = res.json.bind(res);
  res.json = (body) => {
    if (res.statusCode >= 400 && body && typeof body === "object") {
      const rawError =
        [body.error, body.message, body.details]
          .filter((v) => v !== undefined && v !== null && v !== "")
          .join(" - ") || `HTTP ${res.statusCode}`;
      log("warn", `HTTP ${res.statusCode}`, { path: req.originalUrl, method: req.method, error: rawError });
      void reportError({
        partofservice: `${req.method} ${req.originalUrl}`,
        error: rawError,
      });
      return originalJson({ error: friendlyErrorMessage(res.statusCode) });
    }
    return originalJson(body);
  };

  next();
});

// Canonical router for all bus endpoints. Mounted twice: under /bus (canonical)
// and under / (deprecated legacy alias for old clients such as the Windows XP
// driver UI). /health stays on `app` and is never registered on this router.
const busRouter = express.Router();

busRouter.use(require("./routes/stops"));
busRouter.use(require("./routes/lines"));
busRouter.use(require("./routes/fleet"));
busRouter.use(require("./routes/drivers"));
busRouter.use(require("./routes/navigation"));
busRouter.use(require("./routes/gps"));
busRouter.use(require("./routes/routes"));
busRouter.use(require("./routes/daily"));
busRouter.use(require("./routes/weekly"));
busRouter.use(require("./routes/adminSchedules"));
busRouter.use(require("./routes/schedules"));

app.use("/health", require("./routes/health"));

// Canonical bus routes.
app.use("/bus", busRouter);

// Legacy aliases for old clients (Windows XP driver). Deprecated: remove only
// after the driver is retired.
app.use(
  "/",
  (req, res, next) => {
    res.set("Deprecation", 'true; date="2030-01-01"');
    next();
  },
  busRouter,
);

const PORT = process.env.PORT || 5001;

// Initialize database tables on startup
(async () => {
  try {
    await ensureScheduleStopProgressTable();
    console.log("✓ Database tables initialized");
  } catch (err) {
    console.error("⚠ Error initializing tables:", err.message);
    reportError({ partofservice: "startup: table init", error: err.stack || err.message });
  }

  app.listen(PORT, () => console.log(`Transit API listening on ${PORT}`));
})();

module.exports = app;