package main

import (
	"bytes"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"testing"
	"testing/fstest"
)

var fs = http.FileServer(http.Dir("./testdata"))

var srv = httptest.NewServer(fs)

func TestDownload(t *testing.T) {
	var (
		b bytes.Buffer
		c = make(chan request)
	)

	url := srv.URL + "/somefile"
	t.Logf("file URL: %s", url)

	go func() { c <- request{&b, url}; close(c) }()
	Download(c)

	want := "somefile inner data"
	if got := b.String(); got != want {
		t.Errorf("file buffer received unexpected value\nGot:\n%s\nWant:\n%s", got, want)
	}
}

func TestRead(t *testing.T) {
	input := `boston
http://localhost/someboston.jpg
http://localhost/anotherboston.mp4

orlando
http://localhost/someorlando.jpg
`
	dir := t.TempDir()
	t.Logf("root directory: %s", dir)

	c := Read(dir, strings.NewReader(input))
	for range c {
	} // drain the channel

	err := fstest.TestFS(
		os.DirFS(dir),
		"boston0.jpg",
		"boston1.mp4",
		"orlando0.jpg",
	)

	if err != nil {
		t.Fatal(err)
	}
}