package main

import (
	"fmt"
	"log"
	"net/http"
)

func main() {
	ports := []string{"18081", "18082", "18083"}

	for _, port := range ports {
		go startEchoServer(port)
	}

	// Block main goroutine
	select {}
}

func startEchoServer(port string) {
	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		msg := fmt.Sprintf("Response from Backend Server [Port: %s] | Requested Path: %s", port, r.URL.Path)
		// Print to console so we can see which server handled it
		log.Printf("[Port %s] Handled request for %s", port, r.URL.Path)
		
		w.Header().Set("Content-Type", "text/plain")
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(msg + "\n"))
	})

	log.Printf("Starting Echo Server on :%s", port)
	if err := http.ListenAndServe(":"+port, mux); err != nil {
		log.Fatalf("Server on %s failed: %v", port, err)
	}
}