import { MongoClient } from "mongodb";

// MongoDB connection from environment or fallback
const uri =
  process.env.MONGODB_URI ||
  "mongodb://mo1124_ai_web:~4nfR5EA)3%C2%A3%40@mongo76.mydevil.net:27017/mo1124_ai_web?authSource=mo1124_ai_web";

console.log("[MongoDB] 🔧 Initializing connection...");
console.log(
  "[MongoDB] 📍 URI:",
  uri.replace(/:\/\/([^:]+):([^@]+)@/, "://<username>:<password>@"),
);
console.log("[MongoDB] 🌍 Environment:", process.env.NODE_ENV);

// Use global variable to preserve connection across HMR in development
let globalWithMongo = global as typeof globalThis & {
  _mongoClientPromise?: Promise<MongoClient>;
};

let clientPromise: Promise<MongoClient>;

if (!globalWithMongo._mongoClientPromise) {
  console.log("[MongoDB] 🔌 Creating new connection...");
  const client = new MongoClient(uri);
  globalWithMongo._mongoClientPromise = client
    .connect()
    .then((client) => {
      console.log("[MongoDB] ✅ Connected successfully");
      return client;
    })
    .catch((error) => {
      console.error("[MongoDB] ❌ Connection failed:", error.message);
      throw error;
    });
} else {
  console.log("[MongoDB] ♻️ Reusing existing connection");
}

clientPromise = globalWithMongo._mongoClientPromise;

export default clientPromise;