package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {

	ch1 := make(chan string)
	ch2 := make(chan string)

	go func() {
		time.Sleep(time.Duration(rand.Intn(5)+1) * time.Second)
		ch1 <- "Message from channel 1"
	}()

	go func() {
		time.Sleep(time.Duration(rand.Intn(5)+1) * time.Second)
		ch2 <- "Message from channel 2"
	}()

	count := 10
	var channels []chan string
	for i := range count {
		ch := make(chan string)
		channels = append(channels, ch)
		go func() {
			time.Sleep(time.Duration(rand.Intn(5)+1) * time.Second)
			ch <- fmt.Sprintf("Message from dynamic channel %d", i)
		}()
	}

	fanIn := make(chan string)
	for _, ch := range channels {
		go func(c chan string) {
			fanIn <- <-c
		}(ch)
	}

	select {
	case msg1 := <-ch1:
		println("Received:", msg1)
	case msg2 := <-ch2:
		println("Received:", msg2)
	case msg := <-fanIn:
		println("Received:", msg)
	case <-time.After(3 * time.Second):
		println("Timeout occurred")
	default:
		println("Nothing")
	}
}