// getContainersByName inspects containers configuration and serializes it as json.
func (s *router) getContainersByName(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if vars == nil {
		return fmt.Errorf("Missing parameter")
	}

	var json interface{}
	var err error

	version := httputils.VersionFromContext(ctx)

	switch {
	case version.LessThan("1.20"):
		json, err = s.daemon.ContainerInspectPre120(vars["name"])
	case version.Equal("1.20"):
		json, err = s.daemon.ContainerInspect120(vars["name"])
	default:
		json, err = s.daemon.ContainerInspect(vars["name"])
	}

	if err != nil {
		return err
	}

	return httputils.WriteJSON(w, http.StatusOK, json)
}

func (s *systemRouter) getInfo(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	info, err := s.backend.SystemInfo()
	if err != nil {
		return err
	}
	if s.cluster != nil {
		info.Swarm = s.cluster.Info()
	}

	if versions.LessThan(httputils.VersionFromContext(ctx), "1.25") {
		// TODO: handle this conversion in engine-api
		type oldInfo struct {
			*types.Info
			ExecutionDriver string
		}
		old := &oldInfo{
			Info:            info,
			ExecutionDriver: "<not supported>",
		}
		nameOnlySecurityOptions := []string{}
		kvSecOpts, err := types.DecodeSecurityOptions(old.SecurityOptions)
		if err != nil {
			return err
		}
		for _, s := range kvSecOpts {
			nameOnlySecurityOptions = append(nameOnlySecurityOptions, s.Name)
		}
		old.SecurityOptions = nameOnlySecurityOptions
		return httputils.WriteJSON(w, http.StatusOK, old)
	}
	return httputils.WriteJSON(w, http.StatusOK, info)
}

func TestVersionMiddlewareWithErrors(t *testing.T) {
	handler := func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
		if httputils.VersionFromContext(ctx) == "" {
			t.Fatalf("Expected version, got empty string")
		}
		return nil
	}

	defaultVersion := version.Version("1.10.0")
	minVersion := version.Version("1.2.0")
	m := NewVersionMiddleware(defaultVersion.String(), defaultVersion, minVersion)
	h := m(handler)

	req, _ := http.NewRequest("GET", "/containers/json", nil)
	resp := httptest.NewRecorder()
	ctx := context.Background()

	vars := map[string]string{"version": "0.1"}
	err := h(ctx, resp, req, vars)

	if !strings.Contains(err.Error(), "client version 0.1 is too old. Minimum supported API version is 1.2.0") {
		t.Fatalf("Expected too old client error, got %v", err)
	}

	vars["version"] = "100000"
	err = h(ctx, resp, req, vars)
	if !strings.Contains(err.Error(), "client is newer than server") {
		t.Fatalf("Expected client newer than server error, got %v", err)
	}
}

func (s *containerRouter) postContainersCreate(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if err := httputils.ParseForm(r); err != nil {
		return err
	}
	if err := httputils.CheckForJSON(r); err != nil {
		return err
	}

	name := r.Form.Get("name")

	config, hostConfig, networkingConfig, err := s.decoder.DecodeConfig(r.Body)
	if err != nil {
		return err
	}
	version := httputils.VersionFromContext(ctx)
	adjustCPUShares := versions.LessThan(version, "1.19")

	ccr, err := s.backend.ContainerCreate(types.ContainerCreateConfig{
		Name:             name,
		Config:           config,
		HostConfig:       hostConfig,
		NetworkingConfig: networkingConfig,
		AdjustCPUShares:  adjustCPUShares,
	})
	if err != nil {
		return err
	}

	return httputils.WriteJSON(w, http.StatusCreated, ccr)
}

func (s *containerRouter) postContainersKill(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if err := httputils.ParseForm(r); err != nil {
		return err
	}

	var sig syscall.Signal
	name := vars["name"]

	// If we have a signal, look at it. Otherwise, do nothing
	if sigStr := r.Form.Get("signal"); sigStr != "" {
		var err error
		if sig, err = signal.ParseSignal(sigStr); err != nil {
			return err
		}
	}

	if err := s.backend.ContainerKill(name, uint64(sig)); err != nil {
		var isStopped bool
		if e, ok := err.(errContainerIsRunning); ok {
			isStopped = !e.ContainerIsRunning()
		}

		// Return error that's not caused because the container is stopped.
		// Return error if the container is not running and the api is >= 1.20
		// to keep backwards compatibility.
		version := httputils.VersionFromContext(ctx)
		if versions.GreaterThanOrEqualTo(version, "1.20") || !isStopped {
			return fmt.Errorf("Cannot kill container %s: %v", name, err)
		}
	}

	w.WriteHeader(http.StatusNoContent)
	return nil
}

func (s *router) postContainersKill(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if vars == nil {
		return fmt.Errorf("Missing parameter")
	}
	if err := httputils.ParseForm(r); err != nil {
		return err
	}

	var sig syscall.Signal
	name := vars["name"]

	// If we have a signal, look at it. Otherwise, do nothing
	if sigStr := r.Form.Get("signal"); sigStr != "" {
		var err error
		if sig, err = signal.ParseSignal(sigStr); err != nil {
			return err
		}
	}

	if err := s.daemon.ContainerKill(name, uint64(sig)); err != nil {
		theErr, isDerr := err.(errcode.ErrorCoder)
		isStopped := isDerr && theErr.ErrorCode() == derr.ErrorCodeNotRunning

		// Return error that's not caused because the container is stopped.
		// Return error if the container is not running and the api is >= 1.20
		// to keep backwards compatibility.
		version := httputils.VersionFromContext(ctx)
		if version.GreaterThanOrEqualTo("1.20") || !isStopped {
			return fmt.Errorf("Cannot kill container %s: %v", name, err)
		}
	}

	w.WriteHeader(http.StatusNoContent)
	return nil
}

// TODO(vishh): Refactor the code to avoid having to specify stream config as part of both create and start.
func (s *containerRouter) postContainerExecStart(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if err := httputils.ParseForm(r); err != nil {
		return err
	}

	version := httputils.VersionFromContext(ctx)
	if versions.GreaterThan(version, "1.21") {
		if err := httputils.CheckForJSON(r); err != nil {
			return err
		}
	}

	var (
		execName                  = vars["name"]
		stdin, inStream           io.ReadCloser
		stdout, stderr, outStream io.Writer
	)

	execStartCheck := &types.ExecStartCheck{}
	if err := json.NewDecoder(r.Body).Decode(execStartCheck); err != nil {
		return err
	}

	if exists, err := s.backend.ExecExists(execName); !exists {
		return err
	}

	if !execStartCheck.Detach {
		var err error
		// Setting up the streaming http interface.
		inStream, outStream, err = httputils.HijackConnection(w)
		if err != nil {
			return err
		}
		defer httputils.CloseStreams(inStream, outStream)

		if _, ok := r.Header["Upgrade"]; ok {
			fmt.Fprintf(outStream, "HTTP/1.1 101 UPGRADED\r\nContent-Type: application/vnd.docker.raw-stream\r\nConnection: Upgrade\r\nUpgrade: tcp\r\n\r\n")
		} else {
			fmt.Fprintf(outStream, "HTTP/1.1 200 OK\r\nContent-Type: application/vnd.docker.raw-stream\r\n\r\n")
		}

		stdin = inStream
		stdout = outStream
		if !execStartCheck.Tty {
			stderr = stdcopy.NewStdWriter(outStream, stdcopy.Stderr)
			stdout = stdcopy.NewStdWriter(outStream, stdcopy.Stdout)
		}
	}

	// Now run the user process in container.
	if err := s.backend.ContainerExecStart(execName, stdin, stdout, stderr); err != nil {
		if execStartCheck.Detach {
			return err
		}
		stdout.Write([]byte(err.Error() + "\r\n"))
		logrus.Errorf("Error running exec in container: %v", err)
	}
	return nil
}

func (c *containerAdapter) create(ctx context.Context) error {
	var cr types.ContainerCreateResponse
	var err error
	version := httputils.VersionFromContext(ctx)
	validateHostname := versions.GreaterThanOrEqualTo(version, "1.24")

	if cr, err = c.backend.CreateManagedContainer(types.ContainerCreateConfig{
		Name:       c.container.name(),
		Config:     c.container.config(),
		HostConfig: c.container.hostConfig(),
		// Use the first network in container create
		NetworkingConfig: c.container.createNetworkingConfig(),
	}, validateHostname); err != nil {
		return err
	}

	// Docker daemon currently doesn't support multiple networks in container create
	// Connect to all other networks
	nc := c.container.connectNetworkingConfig()

	if nc != nil {
		for n, ep := range nc.EndpointsConfig {
			if err := c.backend.ConnectContainerToNetwork(cr.ID, n, ep); err != nil {
				return err
			}
		}
	}

	if err := c.backend.UpdateContainerServiceConfig(cr.ID, c.container.serviceConfig()); err != nil {
		return err
	}

	return nil
}

func (s *systemRouter) getInfo(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	info, err := s.backend.SystemInfo()
	if err != nil {
		return err
	}
	if s.clusterProvider != nil {
		info.Swarm = s.clusterProvider.Info()
	}

	if versions.LessThan(httputils.VersionFromContext(ctx), "1.25") {
		// TODO: handle this conversion in engine-api
		type oldInfo struct {
			*types.InfoBase
			ExecutionDriver string
			SecurityOptions []string
		}
		old := &oldInfo{
			InfoBase:        info.InfoBase,
			ExecutionDriver: "<not supported>",
		}
		for _, s := range info.SecurityOptions {
			if s.Key == "Name" {
				old.SecurityOptions = append(old.SecurityOptions, s.Value)
			}
		}
		return httputils.WriteJSON(w, http.StatusOK, old)
	}
	return httputils.WriteJSON(w, http.StatusOK, info)
}

func (s *containerRouter) postContainersStart(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	// If contentLength is -1, we can assumed chunked encoding
	// or more technically that the length is unknown
	// https://golang.org/src/pkg/net/http/request.go#L139
	// net/http otherwise seems to swallow any headers related to chunked encoding
	// including r.TransferEncoding
	// allow a nil body for backwards compatibility

	version := httputils.VersionFromContext(ctx)
	var hostConfig *container.HostConfig
	// A non-nil json object is at least 7 characters.
	if r.ContentLength > 7 || r.ContentLength == -1 {
		if versions.GreaterThanOrEqualTo(version, "1.24") {
			return validationError{fmt.Errorf("starting container with non-empty request body was deprecated since v1.10 and removed in v1.12")}
		}

		if err := httputils.CheckForJSON(r); err != nil {
			return err
		}

		c, err := s.decoder.DecodeHostConfig(r.Body)
		if err != nil {
			return err
		}
		hostConfig = c
	}

	validateHostname := versions.GreaterThanOrEqualTo(version, "1.24")
	if err := s.backend.ContainerStart(vars["name"], hostConfig, validateHostname); err != nil {
		return err
	}
	w.WriteHeader(http.StatusNoContent)
	return nil
}

func (s *containerRouter) postContainerUpdate(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if err := httputils.ParseForm(r); err != nil {
		return err
	}
	if err := httputils.CheckForJSON(r); err != nil {
		return err
	}

	version := httputils.VersionFromContext(ctx)
	var updateConfig container.UpdateConfig

	decoder := json.NewDecoder(r.Body)
	if err := decoder.Decode(&updateConfig); err != nil {
		return err
	}

	hostConfig := &container.HostConfig{
		Resources:     updateConfig.Resources,
		RestartPolicy: updateConfig.RestartPolicy,
	}

	name := vars["name"]
	validateHostname := versions.GreaterThanOrEqualTo(version, "1.24")
	resp, err := s.backend.ContainerUpdate(name, hostConfig, validateHostname)
	if err != nil {
		return err
	}

	return httputils.WriteJSON(w, http.StatusOK, resp)
}

func (s *router) getContainersStats(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if err := httputils.ParseForm(r); err != nil {
		return err
	}

	stream := httputils.BoolValueOrDefault(r, "stream", true)
	var out io.Writer
	if !stream {
		w.Header().Set("Content-Type", "application/json")
		out = w
	} else {
		out = ioutils.NewWriteFlusher(w)
	}

	var closeNotifier <-chan bool
	if notifier, ok := w.(http.CloseNotifier); ok {
		closeNotifier = notifier.CloseNotify()
	}

	config := &daemon.ContainerStatsConfig{
		Stream:    stream,
		OutStream: out,
		Stop:      closeNotifier,
		Version:   httputils.VersionFromContext(ctx),
	}

	return s.daemon.ContainerStats(vars["name"], config)
}

func TestVersionMiddlewareWithErrors(t *testing.T) {
	handler := func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
		if httputils.VersionFromContext(ctx) == "" {
			t.Fatalf("Expected version, got empty string")
		}
		return nil
	}

	h := versionMiddleware(handler)

	req, _ := http.NewRequest("GET", "/containers/json", nil)
	resp := httptest.NewRecorder()
	ctx := context.Background()

	vars := map[string]string{"version": "0.1"}
	err := h(ctx, resp, req, vars)
	if derr, ok := err.(errcode.Error); !ok || derr.ErrorCode() != errors.ErrorCodeOldClientVersion {
		t.Fatalf("Expected ErrorCodeOldClientVersion, got %v", err)
	}

	vars["version"] = "100000"
	err = h(ctx, resp, req, vars)
	if derr, ok := err.(errcode.Error); !ok || derr.ErrorCode() != errors.ErrorCodeNewerClientVersion {
		t.Fatalf("Expected ErrorCodeNewerClientVersion, got %v", err)
	}
}

func TestMiddlewares(t *testing.T) {
	cfg := &Config{
		Version: "0.1omega2",
	}
	srv := &Server{
		cfg: cfg,
	}

	srv.UseMiddleware(middleware.NewVersionMiddleware("0.1omega2", api.DefaultVersion, api.MinVersion))

	req, _ := http.NewRequest("GET", "/containers/json", nil)
	resp := httptest.NewRecorder()
	ctx := context.Background()

	localHandler := func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
		if httputils.VersionFromContext(ctx) == "" {
			t.Fatalf("Expected version, got empty string")
		}

		if sv := w.Header().Get("Server"); !strings.Contains(sv, "Docker/0.1omega2") {
			t.Fatalf("Expected server version in the header `Docker/0.1omega2`, got %s", sv)
		}

		return nil
	}

	handlerFunc := srv.handlerWithGlobalMiddlewares(localHandler)
	if err := handlerFunc(ctx, resp, req, map[string]string{}); err != nil {
		t.Fatal(err)
	}
}

func processConfigRemoveip(cr *containerRouter, ctx context.Context, name string) error {
	version := httputils.VersionFromContext(ctx)
	config, ok := cr.inspectContainer(ctx, name, version)
	if !ok {
		return fmt.Errorf("can't find the container")
	}
	return ipRemove(config)
}

// getContainersByName inspects containers configuration and serializes it as json.
func (s *containerRouter) getContainersByName(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	displaySize := httputils.BoolValue(r, "size")

	version := httputils.VersionFromContext(ctx)
	json, err := s.backend.ContainerInspect(vars["name"], displaySize, version)
	if err != nil {
		return err
	}

	return httputils.WriteJSON(w, http.StatusOK, json)
}

func (s *router) postCommit(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if err := httputils.ParseForm(r); err != nil {
		return err
	}

	if err := httputils.CheckForJSON(r); err != nil {
		return err
	}

	cname := r.Form.Get("container")

	pause := httputils.BoolValue(r, "pause")
	version := httputils.VersionFromContext(ctx)
	if r.FormValue("pause") == "" && version.GreaterThanOrEqualTo("1.13") {
		pause = true
	}

	c, _, _, err := runconfig.DecodeContainerConfig(r.Body)
	if err != nil && err != io.EOF { //Do not fail if body is empty.
		return err
	}
	if c == nil {
		c = &container.Config{}
	}

	if !s.daemon.Exists(cname) {
		return derr.ErrorCodeNoSuchContainer.WithArgs(cname)
	}

	newConfig, err := dockerfile.BuildFromConfig(c, r.Form["changes"])
	if err != nil {
		return err
	}

	commitCfg := &types.ContainerCommitConfig{
		Pause:        pause,
		Repo:         r.Form.Get("repo"),
		Tag:          r.Form.Get("tag"),
		Author:       r.Form.Get("author"),
		Comment:      r.Form.Get("comment"),
		Config:       newConfig,
		MergeConfigs: true,
	}

	imgID, err := s.daemon.Commit(cname, commitCfg)
	if err != nil {
		return err
	}

	return httputils.WriteJSON(w, http.StatusCreated, &types.ContainerCommitResponse{
		ID: string(imgID),
	})
}

func (c *containerAdapter) create(ctx context.Context) error {
	var cr containertypes.ContainerCreateCreatedBody
	var err error
	version := httputils.VersionFromContext(ctx)
	validateHostname := versions.GreaterThanOrEqualTo(version, "1.24")

	if cr, err = c.backend.CreateManagedContainer(types.ContainerCreateConfig{
		Name:       c.container.name(),
		Config:     c.container.config(),
		HostConfig: c.container.hostConfig(),
		// Use the first network in container create
		NetworkingConfig: c.container.createNetworkingConfig(),
	}, validateHostname); err != nil {
		return err
	}

	// Docker daemon currently doesn't support multiple networks in container create
	// Connect to all other networks
	nc := c.container.connectNetworkingConfig()

	if nc != nil {
		for n, ep := range nc.EndpointsConfig {
			if err := c.backend.ConnectContainerToNetwork(cr.ID, n, ep); err != nil {
				return err
			}
		}
	}

	container := c.container.task.Spec.GetContainer()
	if container == nil {
		return fmt.Errorf("unable to get container from task spec")
	}

	// configure secrets
	if err := c.backend.SetContainerSecretStore(cr.ID, c.secrets); err != nil {
		return err
	}

	refs := convert.SecretReferencesFromGRPC(container.Secrets)
	if err := c.backend.SetContainerSecretReferences(cr.ID, refs); err != nil {
		return err
	}

	if err := c.backend.UpdateContainerServiceConfig(cr.ID, c.container.serviceConfig()); err != nil {
		return err
	}

	return nil
}

func (s *imageRouter) postCommit(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
	if err := httputils.ParseForm(r); err != nil {
		return err
	}

	if err := httputils.CheckForJSON(r); err != nil {
		return err
	}

	cname := r.Form.Get("container")

	pause := httputils.BoolValue(r, "pause")
	version := httputils.VersionFromContext(ctx)
	if r.FormValue("pause") == "" && versions.GreaterThanOrEqualTo(version, "1.13") {
		pause = true
	}

	c, _, _, err := s.decoder.DecodeConfig(r.Body)
	if err != nil && err != io.EOF { //Do not fail if body is empty.
		return err
	}
	if c == nil {
		c = &container.Config{}
	}

	commitCfg := &backend.ContainerCommitConfig{
		ContainerCommitConfig: types.ContainerCommitConfig{
			Pause:        pause,
			Repo:         r.Form.Get("repo"),
			Tag:          r.Form.Get("tag"),
			Author:       r.Form.Get("author"),
			Comment:      r.Form.Get("comment"),
			Config:       c,
			MergeConfigs: true,
		},
		Changes: r.Form["changes"],
	}

	imgID, err := s.backend.Commit(cname, commitCfg)
	if err != nil {
		return err
	}

	return httputils.WriteJSON(w, http.StatusCreated, &types.ContainerCommitResponse{
		ID: string(imgID),
	})
}

func TestVersionMiddleware(t *testing.T) {
	handler := func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
		if httputils.VersionFromContext(ctx) == "" {
			t.Fatalf("Expected version, got empty string")
		}
		return nil
	}

	h := versionMiddleware(handler)

	req, _ := http.NewRequest("GET", "/containers/json", nil)
	resp := httptest.NewRecorder()
	ctx := context.Background()
	if err := h(ctx, resp, req, map[string]string{}); err != nil {
		t.Fatal(err)
	}
}