func (a *androidSymbolUploader) getBuildVersionFromAPK() (int, error) {
	if a.Apk == "" {
		return 0, stackerr.New("Please provide apk file path.")
	}
	if a.AAPT == "" {
		androidHome := os.Getenv("ANDROID_HOME")
		if androidHome == "" {
			androidHome = os.Getenv("ANDROID_SDK")
		}
		if androidHome == "" {
			return 0, stackerr.New("Cannot find aapt, you might need to set ANDROID_HOME.")
		}

		aapt, err := a.getAAPT(androidHome)
		if err != nil {
			return 0, err
		}
		a.AAPT = aapt
	}

	bytes, err := exec.Command(a.AAPT, "dump", "badging", a.Apk).Output()
	if err != nil {
		return 0, stackerr.Wrap(err)
	}
	return parseVersionFromBytes(bytes)
}

func NewDaemon(options ...DaemonOption) (*daemon, error) {
	d := &daemon{}
	for _, option := range options {
		option(d)
	}

	if d.log == nil {
		return nil, stackerr.New("A logger must be provided")
	}

	if d.host == "" {
		return nil, stackerr.New("Host name/IP must be provided")
	}

	if d.port == "" {
		return nil, stackerr.New("Host port must be provided")
	}

	if err := d.validateFile(); err != nil {
		return nil, err
	}

	cm, err := dyconf.NewManager(d.fileName)
	if err != nil {
		return nil, err
	}
	d.confManager = cm

	return d, nil
}

func AddSelectedParseApp(
	appName string,
	appConfig *parsecli.ParseAppConfig,
	args []string,
	makeDefault, verbose bool,
	e *parsecli.Env,
) error {
	config, err := parsecli.ConfigFromDir(e.Root)
	if err != nil {
		return err
	}
	parseConfig, ok := config.(*parsecli.ParseConfig)
	if !ok {
		return stackerr.New("Invalid Cloud Code config.")
	}

	// add app to config
	if _, ok := parseConfig.Applications[appName]; ok {
		return stackerr.Newf("App %s has already been added", appName)
	}

	parseConfig.Applications[appName] = appConfig

	if len(args) > 0 && args[0] != "" {
		alias := args[0]
		aliasConfig, ok := parseConfig.Applications[alias]
		if !ok {
			parseConfig.Applications[alias] = &parsecli.ParseAppConfig{Link: appName}
		}
		if ok && aliasConfig.GetLink() != "" {
			fmt.Fprintf(e.Out, "Overwriting alias: %q to point to %q\n", alias, appName)
			parseConfig.Applications[alias] = &parsecli.ParseAppConfig{Link: appName}
		}
	}

	if makeDefault {
		if _, ok := parseConfig.Applications[parsecli.DefaultKey]; ok {
			return stackerr.New(`Default key already set. To override default, use command "parse default"`)
		}
		parseConfig.Applications[parsecli.DefaultKey] = &parsecli.ParseAppConfig{Link: appName}
	}

	if err := parsecli.StoreConfig(e, parseConfig); err != nil {
		return err
	}
	if verbose {
		fmt.Fprintf(e.Out, "Written config for %q\n", appName)
		if makeDefault {
			fmt.Fprintf(e.Out, "Set %q as default\n", appName)
		}
	}

	return nil
}

func TestStackErrorString(t *testing.T) {
	t.Parallel()

	h := newHarness(t)
	defer h.Stop()

	err := stackerr.New("error")

	h.env.ErrorStack = false
	errStr := errorString(h.env, err)

	ensure.DeepEqual(t, errStr, "error")

	h.env.ErrorStack = true
	errStr = errorString(h.env, err)

	ensure.StringContains(t, errStr, "error")
	ensure.StringContains(t, errStr, ".go")

	err = stackerr.Wrap(&parse.Error{Message: "message", Code: 1})
	h.env.ErrorStack = false
	errStr = errorString(h.env, err)

	ensure.DeepEqual(t, errStr, "message")

	h.env.ErrorStack = true
	errStr = errorString(h.env, err)

	ensure.StringContains(t, errStr, `parse: api error with code=1 and message="message`)
	ensure.StringContains(t, errStr, ".go")
}

func (s *symbolsCmd) run(e *env, c *context) error {
	android := &androidSymbolUploader{
		Path:     s.path,
		Apk:      s.apk,
		Manifest: s.manifest,
		AAPT:     s.aapt}
	ios := &iosSymbolUploader{
		Path:        s.path,
		SkipOsCheck: s.skipOsCheck}
	switch {
	case android.acceptsPath():
		if err := android.validate(); err != nil {
			return err
		}
		fmt.Fprintln(e.Out, "Uploading Android symbol files...")
		return android.uploadSymbols(e)
	case ios.acceptsPath():
		if err := ios.validate(); err != nil {
			return err
		}
		fmt.Fprintln(e.Out, "Uploading iOS symbol files...")
		return ios.uploadSymbols(e)
	default:
		if s.path == "" {
			return stackerr.New("Please specify path to symbol files")
		}
		return stackerr.Newf("Do not understand symbol files at : %s", s.path)
	}
}

func (l *loginCmd) run(e *env) error {
	fmt.Fprintf(e.Out,
		`Please enter the email id you used to register with Parse
and an account key if you already generated it.
If you do not have an account key or would like to generate a new one,
please type: "y" to open the browser or "n" to continue: `,
	)
	l.helpCreateToken(e)

	var credentials credentials
	fmt.Fprintf(e.Out, "Email: ")
	fmt.Fscanf(e.In, "%s\n", &credentials.email)
	fmt.Fprintf(e.Out, "Account Key: ")
	fmt.Fscanf(e.In, "%s\n", &credentials.token)

	_, err := (&apps{login: loginCmd{credentials: credentials}}).restFetchApps(e)
	if err != nil {
		if err == errAuth {
			fmt.Fprintf(e.Err, `Sorry, we do not have a user with this email and account key.
Please follow instructions at %s to generate a new account key.
`,
				keysURL,
			)
		} else {
			fmt.Fprintf(e.Err, "Unable to validate token with error:\n%s\n", err)
		}
		return stackerr.New("Could not store credentials. Please try again.")
	}

	err = l.storeCredentials(e, &credentials)
	if err == nil {
		fmt.Fprintln(e.Out, "Successfully stored credentials.")
	}
	return stackerr.Wrap(err)
}

func (h *Hooks) deployTriggerHook(e *parsecli.Env, op *hookOperation) error {
	if op.Trigger == nil {
		return stackerr.New("cannot deploy nil trigger hook")
	}

	exists, err := h.triggerHookExists(e, op.Trigger.ClassName, op.Trigger.TriggerName)
	if err != nil {
		return err
	}
	restOp, suppressed, err := h.checkStrictMode(op.Method, exists)
	if err != nil {
		return err
	}

	trigger := &triggerHooksCmd{Trigger: op.Trigger, All: false}
	switch restOp {
	case "POST":
		return trigger.triggerHooksCreate(e, nil)
	case "PUT":
		return trigger.triggerHooksUpdate(e, nil)
	case "DELETE":
		if suppressed {
			return nil
		}
		return trigger.triggerHooksDelete(e, nil)
	}
	return stackerr.Wrap(errInvalidFormat)

}

func (h *Hooks) deployFunctionHook(e *parsecli.Env, op *hookOperation) error {
	if op.Function == nil {
		return stackerr.New("cannot deploy nil function hook")
	}
	exists, err := h.functionHookExists(e, op.Function.FunctionName)
	if err != nil {
		return err
	}

	restOp, suppressed, err := h.checkStrictMode(op.Method, exists)
	if err != nil {
		return err
	}

	function := &functionHooksCmd{Function: op.Function}
	switch restOp {
	case "POST":
		return function.functionHooksCreate(e, nil)
	case "PUT":
		return function.functionHooksUpdate(e, nil)
	case "DELETE":
		if suppressed {
			return nil
		}
		return function.functionHooksDelete(e, nil)
	}
	return stackerr.Wrap(errInvalidFormat)
}

func (c *configureCmd) accountKey(e *env) error {
	token, err := c.login.helpCreateToken(e)
	if err != nil {
		return err
	}

	credentials := credentials{token: token}
	_, err = (&apps{login: login{credentials: credentials}}).restFetchApps(e)
	if err != nil {
		if err == errAuth {
			fmt.Fprintf(e.Err,
				`Sorry, the account key you provided is not valid.
Please follow instructions at %s to generate a new account key.
`,
				keysURL,
			)
		} else {
			fmt.Fprintf(e.Err, "Unable to validate token with error:\n%s\n", err)
		}
		return stackerr.New("Could not store credentials. Please try again.")
	}

	err = c.login.storeCredentials(e, &credentials)
	if err == nil {
		fmt.Fprintln(e.Out, "Successfully stored credentials.")
	}
	return stackerr.Wrap(err)
}

func (j *jsSDKCmd) setVersion(e *env, c *context) error {
	allVersions, err := j.getAllJSSdks(e)
	if err != nil {
		return err
	}
	valid := false
	for _, version := range allVersions {
		if version == j.newVersion {
			valid = true
		}
	}
	if !valid {
		return stackerr.New("Invalid SDK version selected.")
	}

	conf, err := configFromDir(e.Root)
	if err != nil {
		return err
	}
	conf.getProjectConfig().Parse.JSSDK = j.newVersion
	if err := storeProjectConfig(e, conf); err != nil {
		return err
	}

	fmt.Fprintf(e.Out, "Current JavaScript SDK version is %s\n", conf.getProjectConfig().Parse.JSSDK)
	return nil
}

func PromptCreateWebhooks(e *parsecli.Env) (string, error) {
	selections := map[int]string{
		1: "Heroku (https://www.heroku.com)",
		2: "Parse  (https://parse.com/docs/cloudcode/guide)",
	}

	msg := "Sorry! CLI supports only Parse Cloud Code and Heroku."

	projectType := 0
	for i := 0; i < 3; i++ {
		fmt.Fprintf(
			e.Out,
			`Which of these providers would you like use for running your server code:
%d) %s
%d) %s
Type 1 or 2 to make a selection: `,
			1, selections[1],
			2, selections[2],
		)
		fmt.Fscanf(e.In, "%d\n", &projectType)
		fmt.Fprintln(e.Out)
		switch projectType {
		case 1:
			recordDecision(e, "heroku")
			return "heroku", nil
		case 2:
			recordDecision(e, "parse")
			return "parse", nil
		}
		fmt.Fprintln(e.Err, msg)
	}
	return "", stackerr.New(msg)
}

// BestEfforDockerClient creates a docker client from one of:
//
// 1. Environment variables as defined in
//    https://docs.docker.com/reference/commandline/cli/. Specifically
//    DOCKER_HOST, DOCKER_TLS_VERIFY & DOCKER_CERT_PATH.
//
// 2. bootdocker, if darwin.
//
// 3. /run/docker.sock, if it exists.
//
// 4. /var/run/docker.sock, if it exists.
func BestEffortDockerClient() (*dockerclient.DockerClient, error) {
	host := os.Getenv("DOCKER_HOST")

	if host == "" {
		if runtime.GOOS == "darwin" {
			return Boot2DockerClient()
		}

		socketLocations := []string{"/run/docker.sock", "/var/run/docker.sock"}
		for _, l := range socketLocations {
			if _, err := os.Stat(l); err == nil {
				c, err := dockerclient.NewDockerClient(fmt.Sprintf("unix://%s", l), nil)
				if err != nil {
					return nil, stackerr.Wrap(err)
				}
				return c, nil
			}
		}

		return nil, stackerr.New("docker not configured")
	}

	if os.Getenv("DOCKER_TLS_VERIFY") != "" {
		return DockerWithTLS(host, os.Getenv("DOCKER_CERT_PATH"))
	}

	c, err := dockerclient.NewDockerClient(host, nil)
	if err != nil {
		return nil, stackerr.Wrap(err)
	}

	return c, nil
}

func TestMultiErrorString(t *testing.T) {
	t.Parallel()

	h := newHarness(t)
	defer h.Stop()

	err := errgroup.MultiError(
		[]error{
			stackerr.New("error"),
			stackerr.Wrap(&parse.Error{Message: "message", Code: 1}),
		},
	)

	h.env.ErrorStack = false
	errStr := errorString(h.env, err)

	ensure.DeepEqual(t, errStr, "multiple errors: error | message")

	h.env.ErrorStack = true
	errStr = errorString(h.env, err)

	ensure.StringContains(t, errStr, "multiple errors")
	ensure.StringContains(t, errStr, `parse: api error with code=1 and message="message"`)
	ensure.StringContains(t, errStr, ".go")
}

func (d *defaultCmd) run(e *env, args []string) error {
	var newDefault string
	if len(args) > 1 {
		return stackerr.Newf("unexpected arguments, only an optional app name is expected: %v", args)
	}
	if len(args) == 1 {
		newDefault = args[0]
	}

	config, err := configFromDir(e.Root)
	if err != nil {
		return err
	}

	if config.getNumApps() == 0 {
		return stackerr.New("No apps are associated with this project. You can add some with parse add")
	}

	defaultApp := config.getDefaultApp()

	switch newDefault {
	case "":
		return d.printDefault(e, defaultApp)
	default:
		return d.setDefault(e, newDefault, defaultApp, config)
	}
}

func (h *logsCmd) run(e *parsecli.Env, ctx *parsecli.Context) error {
	hkConfig, ok := ctx.AppConfig.(*parsecli.HerokuAppConfig)
	if !ok {
		return stackerr.New("Unexpected config format")
	}

	opts := &heroku.LogSessionCreateOpts{}
	if h.num == 0 {
		h.num = 50
	}
	//source := "app"
	//opts.Source = &source
	opts.Lines = &h.num
	opts.Tail = &h.tail

	session, err := e.HerokuAPIClient.LogSessionCreate(
		hkConfig.HerokuAppID,
		opts,
	)
	if err != nil {
		return stackerr.Wrap(err)
	}
	resp, err := http.Get(session.LogplexURL)
	if err != nil {
		return stackerr.Wrap(err)
	}
	_, err = io.Copy(e.Out, resp.Body)
	return stackerr.Wrap(err)
}

func (a *addCmd) run(e *parsecli.Env, args []string) error {

	if err := a.apps.Login.AuthUser(e, false); err != nil {
		return err
	}
	var appName string
	if len(args) > 1 {
		return stackerr.New("Only an optional Parse app name is expected.")
	}
	if len(args) == 1 {
		appName = args[0]
	}

	app, err := a.selectApp(e, appName)
	if err != nil {
		return err
	}

	var appConfig parsecli.AppConfig
	switch e.Type {
	case parsecli.LegacyParseFormat, parsecli.ParseFormat:
		appConfig = parsecmd.GetParseAppConfig(app)

	case parsecli.HerokuFormat:
		_, appConfig, err = herokucmd.GetLinkedHerokuAppConfig(app, e)
		if err != nil {
			return err
		}
	}

	return a.addSelectedApp(app.Name, appConfig, args, e)
}

func (d *defaultCmd) printDefault(e *env, defaultApp string) error {
	if defaultApp == "" {
		return stackerr.New("No app is set as default app")
	}
	fmt.Fprintf(e.Out, "Current default app is %s\n", defaultApp)
	return nil
}

func (r *rollbackCmd) run(e *parsecli.Env, c *parsecli.Context) error {
	appConfig, ok := c.AppConfig.(*parsecli.HerokuAppConfig)
	if !ok {
		return stackerr.New("Invalid Heroku app config")
	}
	releaseName := r.ReleaseName
	if releaseName == "" {
		lastSecond, err := r.getLastSecondVersion(e, appConfig.HerokuAppID)
		if err != nil {
			return err
		}
		releaseName = fmt.Sprintf("%d", lastSecond)
	}
	release, err := e.HerokuAPIClient.ReleaseRollback(appConfig.HerokuAppID, releaseName)
	if err != nil {
		return stackerr.Wrap(err)
	}
	fmt.Fprintf(
		e.Out,
		`%s
Current version: %d
`,
		release.Description,
		release.Version,
	)
	return nil
}

func (n *newCmd) promptCreateNewApp(e *env, nonInteractive bool) (string, error) {
	if nonInteractive {
		if n.createNewApp {
			return "new", nil
		}
		return "existing", nil
	}

	msg := `"new" and "existing" are the only valid options.
Please try again ...`

	var decision string
	for i := 0; i < 3; i++ {
		fmt.Fprintf(e.Out,
			`Would you like to create a new app, or add Cloud Code to an existing app?
Type "(n)ew" or "(e)xisting": `,
		)
		fmt.Fscanf(e.In, "%s\n", &decision)
		decision = strings.ToLower(decision)

		if decision == "new" || decision == "n" || decision == "existing" || decision == "e" {
			return decision, nil
		}
		fmt.Fprintln(e.Err, msg)
	}
	return "", stackerr.New(msg)
}

func (c *configureCmd) accessToken(e *env) error {
	fmt.Fprintf(e.Out,
		`Please enter an access token if you already generated it.

If you do not have an access token or would like to generate a new one,
please type: "y" to open the browser or "n" to continue: `,
	)

	c.login.helpCreateToken(e)

	var credentials credentials
	fmt.Fprintf(e.Out, "Access Token: ")
	fmt.Fscanf(e.In, "%s\n", &credentials.token)

	_, err := (&apps{login: login{credentials: credentials}}).restFetchApps(e)
	if err != nil {
		if err == errAuth {
			fmt.Fprintf(e.Err,
				`Sorry, the access token you provided is not valid.
Please follow instructions at %s to generate a new access token.
`,
				keysURL,
			)
		} else {
			fmt.Fprintf(e.Err, "Unable to validate token with error:\n%s\n", err)
		}
		return stackerr.New("Could not store credentials. Please try again.")
	}

	err = c.login.storeCredentials(e, &credentials)
	if err == nil {
		fmt.Fprintln(e.Out, "Successfully stored credentials.")
	}
	return stackerr.Wrap(err)
}