require("dotenv").config();

const express = require("express");
const cors = require("cors");
const helmet = require("helmet");
const morgan = require("morgan");
const compression = require("compression");
const rateLimit = require("express-rate-limit");
const path = require("path");

const { initDatabase } = require("./database/init");
const authRoutes = require("./routes/auth");
const reportsRoutes = require("./routes/reports");
const usersRoutes = require("./routes/users");
const storesRoutes = require("./routes/stores");

const app = express();
const PORT = process.env.PORT || 5000;

// Security middleware
app.use(helmet());
app.use(
  cors({
    origin: process.env.FRONTEND_URL || "http://localhost:3000",
    credentials: true,
  })
);

console.log("Loaded ENV PORT:", process.env.PORT);
console.log("Loaded ENV FRONTEND_URL:", process.env.FRONTEND_URL);

// Compression
app.use(compression());

// Rate limiting
const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 1000, // limit each IP to 1000 requests per windowMs
  message: "Too many requests from this IP",
});
app.use(limiter);

// Middleware
app.use(morgan("combined"));
app.use(express.json({ limit: "10mb" }));
app.use(express.urlencoded({ extended: true }));

// Routes
app.use("/api/auth", authRoutes);
app.use("/api/reports", reportsRoutes);
app.use("/api/users", usersRoutes);
app.use("/api/stores", storesRoutes);

// Health check
app.get("/health", (req, res) => {
  res.status(200).json({
    status: "OK",
    timestamp: new Date().toISOString(),
    uptime: process.uptime(),
  });
});

// Error handling middleware
app.use((err, req, res, next) => {
  console.error("Error:", err);
  res.status(500).json({
    error: "Internal Server Error",
    message:
      process.env.NODE_ENV === "development"
        ? err.message
        : "Something went wrong",
  });
});

// 404 handler
app.use((req, res) => {
  res.status(404).json({ error: "Route not found" });
});

// Initialize database and start server
async function startServer() {
  try {
    await initDatabase();
    console.log("Database initialized successfully");

    const server = app.listen(PORT, "0.0.0.0", () => {
      console.log(`🚀 Server running on port ${PORT}`);
      console.log(`🔗 API URL: http://localhost:${PORT}/api`);
      console.log(`📊 Health check: http://localhost:${PORT}/health`);
    });

    const shutdown = () => {
      console.log("Shutdown signal received, closing server...");
      server.close(() => {
        console.log("Server closed gracefully");
        process.exit(0);
      });
    };

    process.on("SIGTERM", shutdown);
    process.on("SIGINT", shutdown);
  } catch (error) {
    console.error("Failed to start server:", error);
    process.exit(1);
  }
}

startServer();