package transport

import (
	"context"
	"os"
	"testing"
)

func TestMemoryTransport(t *testing.T) {
	tr := NewTransport()
	ctx := context.Background()
	// bind / listen
	l, err := tr.Listen(ctx, "127.0.0.1:8080")
	if err != nil {
		t.Fatalf("Unexpected error listening %v", err)
	}
	defer l.Close()

	cherr := make(chan error, 1)
	// accept
	go func() {
		if nerr := l.Accept(func(sock Socket) {
			for {
				var m Message
				if rerr := sock.Recv(&m); rerr != nil {
					cherr <- rerr
					return
				}
				if len(os.Getenv("INTEGRATION_TESTS")) == 0 {
					t.Logf("Server Received %s", string(m.Body))
				}
				if cerr := sock.Send(&Message{
					Body: []byte(`pong`),
				}); cerr != nil {
					cherr <- cerr
					return
				}
			}
		}); nerr != nil {
			cherr <- err
		}
	}()

	// dial
	c, err := tr.Dial(ctx, "127.0.0.1:8080")
	if err != nil {
		t.Fatalf("Unexpected error dialing %v", err)
	}
	defer c.Close()

	select {
	case err := <-cherr:
		t.Fatal(err)
	default:
		// send <=> receive
		for i := 0; i < 3; i++ {
			if err := c.Send(&Message{
				Body: []byte(`ping`),
			}); err != nil {
				return
			}
			var m Message
			if err := c.Recv(&m); err != nil {
				return
			}
			if len(os.Getenv("INTEGRATION_TESTS")) == 0 {
				t.Logf("Client Received %s", string(m.Body))
			}
		}
	}
}

func TestListener(t *testing.T) {
	tr := NewTransport()
	ctx := context.Background()
	// bind / listen on random port
	l, err := tr.Listen(ctx, ":0")
	if err != nil {
		t.Fatalf("Unexpected error listening %v", err)
	}
	defer l.Close()

	// try again
	l2, err := tr.Listen(ctx, ":0")
	if err != nil {
		t.Fatalf("Unexpected error listening %v", err)
	}
	defer l2.Close()

	// now make sure it still fails
	l3, err := tr.Listen(ctx, ":8080")
	if err != nil {
		t.Fatalf("Unexpected error listening %v", err)
	}
	defer l3.Close()

	if _, err := tr.Listen(ctx, ":8080"); err == nil {
		t.Fatal("Expected error binding to :8080 got nil")
	}
}