package control

import (
	"errors"
	"net"
	"strings"
	"testing"
)

func TestRoundTrip(t *testing.T) {
	server, client := net.Pipe()
	go serveConn(server, func(cmd string) string {
		if cmd != CmdUpdateNow {
			return "ERR unknown command: " + cmd
		}
		return "OK v0.2.2 is up to date"
	})
	reply, err := readReply(client, CmdUpdateNow)
	if err != nil {
		t.Fatal(err)
	}
	if reply != "OK v0.2.2 is up to date" {
		t.Fatalf("reply = %q", reply)
	}

	server2, client2 := net.Pipe()
	go serveConn(server2, func(cmd string) string { return "ERR unknown command: " + cmd })
	reply, err = readReply(client2, "bogus")
	if err != nil {
		t.Fatal(err)
	}
	if !strings.HasPrefix(reply, "ERR ") {
		t.Fatalf("reply = %q, want ERR prefix", reply)
	}
}

func TestEmptyReplyIsUnavailable(t *testing.T) {
	server, client := net.Pipe()
	go serveConn(server, func(cmd string) string {
		server.Close() // hang up without answering
		return ""
	})
	if _, err := readReply(client, CmdUpdateNow); !errors.Is(err, ErrUnavailable) {
		t.Fatalf("err = %v, want ErrUnavailable", err)
	}
}