package email

import (
	"os"
	"path/filepath"
	"testing"
)

// "An existing connection was forcibly closed" during DATA reads the same
// whether the server refused the SIZE, hit a quota, or just dropped the socket
// — and only the first is something the operator can act on. Naming the size in
// the error rules it in or out without a second attempt.
func TestDescribeSize(t *testing.T) {
	dir := t.TempDir()
	a := filepath.Join(dir, "card.jpg")
	if err := os.WriteFile(a, make([]byte, 2048), 0o644); err != nil {
		t.Fatal(err)
	}

	if got := describeSize(nil); got != "no attachment" {
		t.Errorf("no attachment = %q", got)
	}
	if got := describeSize([]string{""}); got != "no attachment" {
		t.Errorf("blank path = %q, want it ignored", got)
	}
	if got := describeSize([]string{a}); got != "1 attachment(s), 2 KB" {
		t.Errorf("one file = %q", got)
	}
	// A path that does not exist must not be counted — the mail library skips it,
	// so reporting it would describe a message that was never sent.
	if got := describeSize([]string{a, filepath.Join(dir, "gone.jpg")}); got != "1 attachment(s), 2 KB" {
		t.Errorf("missing file counted: %q", got)
	}
}