// commandShouldRunOnDaemon determines, from commmand details, whether a
// command ought to be executed on an IPFS daemon.
//
// It returns a client if the command should be executed on a daemon and nil if
// it should be executed on a client. It returns an error if the command must
// NOT be executed on either.
func commandShouldRunOnDaemon(details cmdDetails, req cmds.Request, root *cmds.Command) (cmdsHttp.Client, error) {
	path := req.Path()
	// root command.
	if len(path) < 1 {
		return nil, nil
	}

	if details.cannotRunOnClient && details.cannotRunOnDaemon {
		return nil, fmt.Errorf("command disabled: %s", path[0])
	}

	if details.doesNotUseRepo && details.canRunOnClient() {
		return nil, nil
	}

	// at this point need to know whether api is running. we defer
	// to this point so that we dont check unnecessarily

	// did user specify an api to use for this command?
	apiAddrStr, _, err := req.Option(coreCmds.ApiOption).String()
	if err != nil {
		return nil, err
	}

	client, err := getApiClient(req.InvocContext().ConfigRoot, apiAddrStr)
	if err == repo.ErrApiNotRunning {
		if apiAddrStr != "" && req.Command() != daemonCmd {
			// if user SPECIFIED an api, and this cmd is not daemon
			// we MUST use it. so error out.
			return nil, err
		}

		// ok for api not to be running
	} else if err != nil { // some other api error
		return nil, err
	}

	if client != nil { // daemon is running
		if details.cannotRunOnDaemon {
			e := "cannot use API with this command."

			// check if daemon locked. legacy error text, for now.
			daemonLocked, _ := fsrepo.LockedByOtherProcess(req.InvocContext().ConfigRoot)
			if daemonLocked {
				e = "ipfs daemon is running. please stop it to run this command"
			}

			return nil, cmds.ClientError(e)
		}

		return client, nil
	}

	if details.cannotRunOnClient {
		return nil, cmds.ClientError("must run on the ipfs daemon")
	}

	return nil, nil
}

func doMount(node *core.IpfsNode, fsdir, nsdir string) error {
	fmtFuseErr := func(err error, mountpoint string) error {
		s := err.Error()
		if strings.Contains(s, fuseNoDirectory) {
			s = strings.Replace(s, `fusermount: "fusermount:`, "", -1)
			s = strings.Replace(s, `\n", exit status 1`, "", -1)
			return cmds.ClientError(s)
		}
		if s == fuseExitStatus1 {
			s = fmt.Sprintf("fuse failed to access mountpoint %s", mountpoint)
			return cmds.ClientError(s)
		}
		return err
	}

	// this sync stuff is so that both can be mounted simultaneously.
	var fsmount mount.Mount
	var nsmount mount.Mount
	var err1 error
	var err2 error

	done := make(chan struct{})

	go func() {
		fsmount, err1 = rofs.Mount(node, fsdir)
		done <- struct{}{}
	}()

	go func() {
		nsmount, err2 = ipns.Mount(node, nsdir, fsdir)
		done <- struct{}{}
	}()

	<-done
	<-done

	if err1 != nil || err2 != nil {
		log.Infof("error mounting: %s %s", err1, err2)
		if fsmount != nil {
			fsmount.Unmount()
		}
		if nsmount != nil {
			nsmount.Unmount()
		}

		if err1 != nil {
			return fmtFuseErr(err1, fsdir)
		}
		return fmtFuseErr(err2, nsdir)
	}

	// setup node state, so that it can be cancelled
	node.Mounts.Ipfs = fsmount
	node.Mounts.Ipns = nsmount
	return nil
}

// parseAddresses is a function that takes in a slice of string peer addresses
// (multiaddr + peerid) and returns slices of multiaddrs and peerids.
func parseAddresses(addrs []string) (iaddrs []iaddr.IPFSAddr, err error) {
	iaddrs = make([]iaddr.IPFSAddr, len(addrs))
	for i, saddr := range addrs {
		iaddrs[i], err = iaddr.ParseString(saddr)
		if err != nil {
			return nil, cmds.ClientError("invalid peer address: " + err.Error())
		}
	}
	return
}

// commandShouldRunOnDaemon determines, from commmand details, whether a
// command ought to be executed on an IPFS daemon.
//
// It returns true if the command should be executed on a daemon and false if
// it should be executed on a client. It returns an error if the command must
// NOT be executed on either.
func commandShouldRunOnDaemon(details cmdDetails, req cmds.Request, root *cmds.Command) (bool, error) {
	path := req.Path()
	// root command.
	if len(path) < 1 {
		return false, nil
	}

	if details.cannotRunOnClient && details.cannotRunOnDaemon {
		return false, fmt.Errorf("command disabled: %s", path[0])
	}

	if details.doesNotUseRepo && details.canRunOnClient() {
		return false, nil
	}

	// at this point need to know whether daemon is running. we defer
	// to this point so that some commands dont open files unnecessarily.
	daemonLocked, err := fsrepo.LockedByOtherProcess(req.InvocContext().ConfigRoot)
	if err != nil {
		return false, err
	}

	if daemonLocked {

		log.Info("a daemon is running...")

		if details.cannotRunOnDaemon {
			e := "ipfs daemon is running. please stop it to run this command"
			return false, cmds.ClientError(e)
		}

		return true, nil
	}

	if details.cannotRunOnClient {
		return false, cmds.ClientError("must run on the ipfs daemon")
	}

	return false, nil
}

		// TODO need to decide whether to expose the override as a file or a
		// directory. That is: should we allow the user to also specify the
		// name of the file?
		// TODO cmds.StringOption("event-logs", "l", "Location for machine-readable event logs."),
	},
	PreRun: func(req cmds.Request) error {
		daemonLocked, err := fsrepo.LockedByOtherProcess(req.InvocContext().ConfigRoot)
		if err != nil {
			return err
		}

		log.Info("checking if daemon is running...")
		if daemonLocked {
			log.Debug("Ipfs daemon is running.")
			e := "ipfs daemon is running. please stop it to run this command"
			return cmds.ClientError(e)
		}

		return nil
	},
	Run: func(req cmds.Request, res cmds.Response) {
		if req.InvocContext().Online {
			res.SetError(errors.New("init must be run offline only!"), cmds.ErrNormal)
			return
		}

		empty, _, err := req.Option("e").Bool() // if !empty, it's okay empty == false
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

	},
	Options: []cmds.Option{
		cmds.StringOption("format", "f", "optional output format"),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		node, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		var id peer.ID
		if len(req.Arguments()) > 0 {
			id = peer.ID(b58.Decode(req.Arguments()[0]))
			if len(id) == 0 {
				res.SetError(cmds.ClientError("Invalid peer id"), cmds.ErrClient)
				return
			}
		} else {
			id = node.Identity
		}

		if id == node.Identity {
			output, err := printSelf(node)
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}
			res.SetOutput(output)
			return
		}