package googlecompute

// Driver is the interface that has to be implemented to communicate
// with GCE. The Driver interface exists mostly to allow a mock implementation
// to be used to test the steps.
type Driver interface {
	// ImageExists returns true if the specified image exists. If an error
	// occurs calling the API, this method returns false.
	ImageExists(name string) bool

	// CreateImage creates an image from the given disk in Google Compute
	// Engine.
	CreateImage(name, description, zone, disk string) <-chan error

	// DeleteImage deletes the image with the given name.
	DeleteImage(name string) <-chan error

	// DeleteInstance deletes the given instance, keeping the boot disk.
	DeleteInstance(zone, name string) (<-chan error, error)

	// DeleteDisk deletes the disk with the given name.
	DeleteDisk(zone, name string) (<-chan error, error)

	// GetNatIP gets the NAT IP address for the instance.
	GetNatIP(zone, name string) (string, error)

	// GetInternalIP gets the GCE-internal IP address for the instance.
	GetInternalIP(zone, name string) (string, error)

	// RunInstance takes the given config and launches an instance.
	RunInstance(*InstanceConfig) (<-chan error, error)

	// WaitForInstance waits for an instance to reach the given state.
	WaitForInstance(state, zone, name string) <-chan error
}

type Image struct {
	Name      string
	ProjectId string
}

type InstanceConfig struct {
	Description string
	DiskSizeGb  int64
	Image       Image
	MachineType string
	Metadata    map[string]string
	Name        string
	Network     string
	Address     string
	Preemptible bool
	Tags        []string
	Zone        string
}