const (
	CoEClassstring     = syscall.Errno(0x800401F3) // Invalid class string
	ErrorNoNetwork     = syscall.Errno(1222)       // The network is not present or not started
	ErrorBadPathname   = syscall.Errno(161)        // The specified path is invalid
	ErrorInvalidObject = syscall.Errno(0x800710D8) // The object identifier does not represent a valid object
)

const (
	StateStart        = "start-container"
	StatePause        = "pause"
	StateResume       = "resume"
	StateExit         = "exit"
	StateRestart      = "restart"
	StateRestore      = "restore"
	StateStartProcess = "start-process"
	StateExitProcess  = "exit-process"
	StateOOM          = "oom" // fake state

)

const (
	// InitFriendlyName is the name given in the lookup map of processes
	// for the first process started in a container.
	InitFriendlyName = "init"
)

type Backend interface {
	StateChanged(containerID string, state StateInfo) error
	AttachStreams(processFriendlyName string, io IOPipe) error
}

type Client interface {
	Create(containerID string, spec Spec, options ...CreateOption) error
	Signal(containerID string, sig int) error
	AddProcess(containerID, processFriendlyName string, process Process) error
	Resize(containerID, processFriendlyName string, width, height int) error
	Pause(containerID string) error
	Resume(containerID string) error
	Restore(containerID string, options ...CreateOption) error
	Stats(containerID string) (*Stats, error)
	GetPidsForContainer(containerID string) ([]int, error)
	Summary(containerID string) ([]Summary, error)
	UpdateResources(containerID string, resources Resources) error
}

type CreateOption interface {
	Apply(interface{}) error
}

type IOPipe struct {
	Stdin    io.WriteCloser
	Stdout   io.Reader
	Stderr   io.Reader
	Terminal bool // Whether stderr is connected on Windows
}

type Process windowsoci.Process

type Remote interface {
	// Client returns a new Client instance connected with given Backend.
	Client(Backend) (Client, error)
	// Cleanup stops containerd if it was started by libcontainerd.
	// Note this is not used on Windows as there is no remote containerd.
	Cleanup()
}

type RemoteOption interface {
	Apply(Remote) error
}

type Resources struct{}

type Spec windowsoci.WindowsSpec

type StateInfo struct {
	State     string
	Pid       uint32
	ExitCode  uint32
	ProcessID string
	OOMKilled bool // TODO Windows containerd factor out
}

type Stats struct{}

type Summary struct {
	Pid     uint32
	Command string
}

type User windowsoci.User