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 InitProcessName = "init"

type Backend interface {
	ProcessEvent(containerID string, event EventType, ei EventInfo) error
}

type Checkpoint struct {
	Name string
}

type Checkpoints struct {
	Checkpoints []*Checkpoint
}

type Client interface {
	Version(ctx context.Context) (containerd.Version, error)

	Restore(ctx context.Context, containerID string, attachStdio StdioCallback) (alive bool, pid int, err error)

	Create(ctx context.Context, containerID string, spec *specs.Spec, runtimeOptions interface{}) error
	Start(ctx context.Context, containerID, checkpointDir string, withStdin bool, attachStdio StdioCallback) (pid int, err error)
	SignalProcess(ctx context.Context, containerID, processID string, signal int) error
	Exec(ctx context.Context, containerID, processID string, spec *specs.Process, withStdin bool, attachStdio StdioCallback) (int, error)
	ResizeTerminal(ctx context.Context, containerID, processID string, width, height int) error
	CloseStdin(ctx context.Context, containerID, processID string) error
	Pause(ctx context.Context, containerID string) error
	Resume(ctx context.Context, containerID string) error
	Stats(ctx context.Context, containerID string) (*Stats, error)
	ListPids(ctx context.Context, containerID string) ([]uint32, error)
	Summary(ctx context.Context, containerID string) ([]Summary, error)
	DeleteTask(ctx context.Context, containerID string) (uint32, time.Time, error)
	Delete(ctx context.Context, containerID string) error
	Status(ctx context.Context, containerID string) (Status, error)

	UpdateResources(ctx context.Context, containerID string, resources *Resources) error
	CreateCheckpoint(ctx context.Context, containerID, checkpointDir string, exit bool) error
}

type EventInfo struct {
	ContainerID string
	ProcessID   string
	Pid         uint32
	ExitCode    uint32
	ExitedAt    time.Time
	OOMKilled   bool
	// Windows Only field
	UpdatePending bool
}

type EventType string

const (
	EventUnknown     EventType = "unknown"
	EventExit        EventType = "exit"
	EventOOM         EventType = "oom"
	EventCreate      EventType = "create"
	EventStart       EventType = "start"
	EventExecAdded   EventType = "exec-added"
	EventExecStarted EventType = "exec-started"
	EventPaused      EventType = "paused"
	EventResumed     EventType = "resumed"
)

type IOPipe struct {
	Stdin    io.WriteCloser
	Stdout   io.ReadCloser
	Stderr   io.ReadCloser
	Terminal bool // Whether stderr is connected on Windows
	// contains filtered or unexported fields
}

type LCOWOption struct {
	Config *opengcs.Config
}

type Remote interface {
	// Client returns a new Client instance connected with given Backend.
	NewClient(namespace string, backend 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 ServerVersion struct {
}

type Stats struct {
	Read     time.Time
	HCSStats *hcsshim.Statistics
}

type Status string

const (
	// Running indicates the process is currently executing
	StatusRunning Status = "running"
	// Created indicates the process has been created within containerd but the
	// user's defined process has not started
	StatusCreated Status = "created"
	// Stopped indicates that the process has ran and exited
	StatusStopped Status = "stopped"
	// Paused indicates that the process is currently paused
	StatusPaused Status = "paused"
	// Pausing indicates that the process is currently switching from a
	// running state into a paused state
	StatusPausing Status = "pausing"
	// Unknown indicates that we could not determine the status from the runtime
	StatusUnknown Status = "unknown"
)

type StdioCallback func(*IOPipe) (cio.IO, error)

type Summary hcsshim.ProcessListItem