package wsclient

import (
	"context"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"github.com/coder/websocket"
)

func TestConnectOnceCleanDisconnectDoesNotPanic(t *testing.T) {
	serverErr := make(chan error, 1)
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		conn, err := websocket.Accept(w, r, nil)
		if err != nil {
			serverErr <- err
			return
		}
		defer conn.CloseNow() //nolint:errcheck

		// Wait for the agent hello so Dial and the first client write have both
		// completed before ending the connection normally.
		if _, _, err := conn.Read(r.Context()); err != nil {
			serverErr <- err
			return
		}
		serverErr <- conn.Close(websocket.StatusNormalClosure, "test complete")
	}))
	defer srv.Close()

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	err := connectOnce(ctx, Config{
		ServerURL:       srv.URL,
		AgentToken:      "test-token",
		HeartbeatPeriod: time.Hour,
	}, nil)
	if err == nil {
		t.Fatal("connectOnce returned nil after server disconnected")
	}
	if err := <-serverErr; err != nil {
		t.Fatalf("server websocket: %v", err)
	}
}