package join

import (
	"context"
	"strings"
	"testing"
	"time"
)

func listen(t *testing.T) *Listener {
	t.Helper()
	l, err := Listen("127.0.0.1:0", "", time.Hour)
	if err != nil {
		t.Fatal(err)
	}
	l.addr = l.ln.Addr().String()
	t.Cleanup(func() { _ = l.Close() })
	return l
}

func TestAJoinedMachineRunsWhatTheSetupSendsUntilItIsDone(t *testing.T) {
	l := listen(t)
	code, arrived := l.Code("database")
	parsed, err := Parse(code.String())
	if err != nil || parsed.Role != "database" {
		t.Fatalf("%v %+v", err, parsed)
	}
	var said []string
	served := make(chan error, 1)
	go func() { served <- Serve(context.Background(), parsed, func(s string) { said = append(said, s) }) }()

	var m *Remote
	select {
	case m = <-arrived:
	case err := <-served:
		t.Fatalf("join ended before arriving: %v", err)
	case <-time.After(5 * time.Second):
		t.Fatal("the machine never arrived")
	}
	if m.Hostname == "" || m.Addr != "127.0.0.1" {
		t.Errorf("arrived as %q from %q", m.Hostname, m.Addr)
	}
	out, err := m.Run(context.Background(), "set -e\ntr a-z A-Z", []byte("hello\n"))
	if err != nil || string(out) != "HELLO\n" {
		t.Fatalf("%q, %v", out, err)
	}
	if out, err := m.Run(context.Background(), "echo nope >&2; exit 3", nil); err == nil || !strings.Contains(string(out), "nope") {
		t.Errorf("a failing script: %q, %v", out, err)
	}
	_ = m.Close()
	if err := <-served; err != nil {
		t.Errorf("join did not end cleanly when the setup was done: %v", err)
	}
	if len(said) < 2 || !strings.Contains(strings.Join(said, "\n"), "tr a-z A-Z") {
		t.Errorf("the machine's operator was not told what ran: %q", said)
	}

	// The code was for one machine.
	if err := Serve(context.Background(), parsed, func(string) {}); err == nil || !strings.Contains(err.Error(), "used already") {
		t.Errorf("a code used twice: %v", err)
	}
}

func TestAJoinRefusesAListenerThatIsNotTheOneInTheCode(t *testing.T) {
	l := listen(t)
	code, _ := l.Code("node")
	other := listen(t)
	code.Addr = other.addr // what the code names is elsewhere
	err := Serve(context.Background(), code, func(string) {})
	if err == nil || !strings.Contains(err.Error(), "not the setup") {
		t.Errorf("joined a stranger: %v", err)
	}
}

func TestAnExpiredOrDamagedCodeIsRefusedBeforeDialling(t *testing.T) {
	c := Code{Addr: "10.0.0.5:7444", Role: "node", Expires: time.Now().Add(-time.Minute).Unix()}
	if _, err := Parse(c.String()); err == nil || !strings.Contains(err.Error(), "expired") {
		t.Errorf("expired: %v", err)
	}
	if _, err := Parse(c.String()[:30]); err == nil {
		t.Error("a truncated code was read")
	}
	if _, err := Parse("ssh-rsa AAAA"); err == nil {
		t.Error("something else was read as a code")
	}
	// Short enough to copy from a screen in one line.
	c.Expires = time.Now().Add(time.Hour).Unix()
	if n := len(c.String()); n > 100 {
		t.Errorf("a code is %d characters", n)
	}
	if back, err := Parse(c.String()); err != nil || back.Addr != c.Addr || back.Role != "node" {
		t.Errorf("%+v, %v", back, err)
	}
}