import express, { type Express } from "express";
import cors from "cors";
import pinoHttp from "pino-http";
import { rateLimit } from "express-rate-limit";
import router from "./routes";
import { logger } from "./lib/logger";

const app: Express = express();

app.use(
  pinoHttp({
    logger,
    serializers: {
      req(req) {
        return {
          id: req.id,
          method: req.method,
          url: req.url?.split("?")[0],
        };
      },
      res(res) {
        return {
          statusCode: res.statusCode,
        };
      },
    },
  }),
);
const allowedOrigins = process.env.ALLOWED_ORIGINS
  ? process.env.ALLOWED_ORIGINS.split(",")
  : ["http://localhost:5173", "http://localhost:3000"];

app.use(cors({
  origin: (origin, callback) => {
    if (!origin || allowedOrigins.includes(origin)) {
      callback(null, true);
    } else {
      callback(new Error("Not allowed by CORS"));
    }
  },
  credentials: true,
}));
app.use(express.json());
app.use(express.urlencoded({ extended: true }));

// A) General API limiter for all /api routes: window 15 mins, max 500 requests per IP
const generalApiLimiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 500,
  message: "طلبات كثيرة جداً، حاول مجدداً بعد قليل",
  standardHeaders: true,
  legacyHeaders: false,
  skip: (req) => process.env.NODE_ENV === "test" || req.headers["x-bypass-rate-limit"] === "true",
});

// B) Auth limiter strictly on /api/auth/login: window 15 mins, max 10 attempts per IP
const authLimiter = rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 10,
  message: "محاولات تسجيل دخول كثيرة، انتظر 15 دقيقة",
  standardHeaders: true,
  legacyHeaders: false,
  skip: (req) => process.env.NODE_ENV === "test" || req.headers["x-bypass-rate-limit"] === "true",
});

// C) Upload limiter for attachments/upload routes: window 1 hour, max 50 uploads per IP
const uploadLimiter = rateLimit({
  windowMs: 60 * 60 * 1000,
  max: 50,
  message: "تجاوزت حد الرفع المسموح به",
  standardHeaders: true,
  legacyHeaders: false,
  skip: (req) => process.env.NODE_ENV === "test" || req.headers["x-bypass-rate-limit"] === "true",
});

// Apply Rate Limiters before the router middleware
app.use("/api/auth/login", authLimiter);
app.use("/api/attachments", uploadLimiter);
app.use("/api/upload", uploadLimiter);
app.use("/api/tasks/:id/attachments", uploadLimiter);
app.use("/api", generalApiLimiter);

app.use("/api", router);

export default app;