// Init initializes a new swarm cluster.
func (d *SwarmDaemon) Init(autoAccept map[string]bool, secret string) error {
	req := swarm.InitRequest{
		ListenAddr: d.listenAddr,
	}
	for _, role := range []swarm.NodeRole{swarm.NodeRoleManager, swarm.NodeRoleWorker} {
		policy := swarm.Policy{
			Role:       role,
			Autoaccept: autoAccept[strings.ToLower(string(role))],
		}

		if secret != "" {
			policy.Secret = &secret
		}

		req.Spec.AcceptancePolicy.Policies = append(req.Spec.AcceptancePolicy.Policies, policy)
	}
	status, out, err := d.SockRequest("POST", "/swarm/init", req)
	if status != http.StatusOK {
		return fmt.Errorf("initializing swarm: invalid statuscode %v, %q", status, out)
	}
	if err != nil {
		return fmt.Errorf("initializing swarm: %v", err)
	}
	info, err := d.info()
	if err != nil {
		return err
	}
	d.Info = info
	return nil
}

// SwarmFromGRPC converts a grpc Cluster to a Swarm.
func SwarmFromGRPC(c swarmapi.Cluster) types.Swarm {
	swarm := types.Swarm{
		ID: c.ID,
		Spec: types.Spec{
			Orchestration: types.OrchestrationConfig{
				TaskHistoryRetentionLimit: c.Spec.Orchestration.TaskHistoryRetentionLimit,
			},
			Raft: types.RaftConfig{
				SnapshotInterval:           c.Spec.Raft.SnapshotInterval,
				KeepOldSnapshots:           c.Spec.Raft.KeepOldSnapshots,
				LogEntriesForSlowFollowers: c.Spec.Raft.LogEntriesForSlowFollowers,
				HeartbeatTick:              c.Spec.Raft.HeartbeatTick,
				ElectionTick:               c.Spec.Raft.ElectionTick,
			},
		},
	}

	heartbeatPeriod, _ := ptypes.Duration(c.Spec.Dispatcher.HeartbeatPeriod)
	swarm.Spec.Dispatcher.HeartbeatPeriod = uint64(heartbeatPeriod)

	swarm.Spec.CAConfig.NodeCertExpiry, _ = ptypes.Duration(c.Spec.CAConfig.NodeCertExpiry)

	for _, ca := range c.Spec.CAConfig.ExternalCAs {
		swarm.Spec.CAConfig.ExternalCAs = append(swarm.Spec.CAConfig.ExternalCAs, &types.ExternalCA{
			Protocol: types.ExternalCAProtocol(strings.ToLower(ca.Protocol.String())),
			URL:      ca.URL,
			Options:  ca.Options,
		})
	}

	// Meta
	swarm.Version.Index = c.Meta.Version.Index
	swarm.CreatedAt, _ = ptypes.Timestamp(c.Meta.CreatedAt)
	swarm.UpdatedAt, _ = ptypes.Timestamp(c.Meta.UpdatedAt)

	// Annotations
	swarm.Spec.Name = c.Spec.Annotations.Name
	swarm.Spec.Labels = c.Spec.Annotations.Labels

	for _, policy := range c.Spec.AcceptancePolicy.Policies {
		p := types.Policy{
			Role:       types.NodeRole(strings.ToLower(policy.Role.String())),
			Autoaccept: policy.Autoaccept,
		}
		if policy.Secret != nil {
			secret := string(policy.Secret.Data)
			p.Secret = &secret
		}
		swarm.Spec.AcceptancePolicy.Policies = append(swarm.Spec.AcceptancePolicy.Policies, p)
	}

	return swarm
}