package nostr

import (
	"context"
	"errors"
	"io"
	"net/http"
	"net/http/httptest"
	"sync"
	"testing"
	"time"

	"golang.org/x/net/websocket"
)

func TestConnectContext(t *testing.T) {
	// fake relay server
	var mu sync.Mutex // guards connected to satisfy go test -race
	var connected bool
	ws := newWebsocketServer(func(conn *websocket.Conn) {
		mu.Lock()
		connected = true
		mu.Unlock()
		io.ReadAll(conn) // discard all input
	})
	defer ws.Close()

	// relay client
	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()
	r, err := RelayConnectContext(ctx, ws.URL)
	if err != nil {
		t.Fatalf("RelayConnectContext: %v", err)
	}
	defer r.Close()

	mu.Lock()
	defer mu.Unlock()
	if !connected {
		t.Error("fake relay server saw no client connect")
	}
}

func TestConnectContextCanceled(t *testing.T) {
	// fake relay server
	ws := newWebsocketServer(func(conn *websocket.Conn) {
		io.ReadAll(conn) // discard all input
	})
	defer ws.Close()

	// relay client
	ctx, cancel := context.WithCancel(context.Background())
	cancel() // make ctx expired
	_, err := RelayConnectContext(ctx, ws.URL)
	if !errors.Is(err, context.Canceled) {
		t.Errorf("RelayConnectContext returned %v error; want context.Canceled", err)
	}
}

func newWebsocketServer(handler func(*websocket.Conn)) *httptest.Server {
	return httptest.NewServer(&websocket.Server{
		Handshake: anyOriginHandshake,
		Handler:   handler,
	})
}

// anyOriginHandshake is an alternative to default in golang.org/x/net/websocket
// which checks for origin. nostr client sends no origin and it makes no difference
// for the tests here anyway.
var anyOriginHandshake = func(conf *websocket.Config, r *http.Request) error {
	return nil
}