package main

import (
	"fmt"
	"io"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"strings"
	"time"
)

func main() {
	start := time.Now()
	ch := make(chan string)
	if len(os.Args[1:]) < 1 {
		log.Fatal("needs args")
	}
	for _, url := range os.Args[1:] {
		if !strings.HasPrefix(url, "http://") {
			url = "http://" + url
		}
		go fetch(url, ch)
	}
	longest := time.After(time.Duration(time.Second))
	for range os.Args[1:] {
		select {
		case s := <-ch:
			fmt.Println(s)
		case <-longest:
			fmt.Println("took too long")
			break
		}
	}
	fmt.Printf("%.2fs\n", time.Since(start).Seconds())
}

func fetch(url string, ch chan string) {
	start := time.Now()
	resp, err := http.Get(url)
	if err != nil {
		ch <- fmt.Sprint(err)
		return
	}
	defer resp.Body.Close()
	nbytes, err := io.Copy(ioutil.Discard, resp.Body)
	if err != nil {
		ch <- fmt.Sprint(err)
		return
	}
	elapsed := time.Since(start).Seconds()
	ch <- fmt.Sprintf("%.2fs %7d %s", elapsed, nbytes, url)
}