type BaseContainer interface {
	// Returns the ID of the container
	ID() string

	// Returns the current status of the container.
	//
	// errors:
	// ContainerDestroyed - Container no longer exists,
	// Systemerror - System error.
	Status() (Status, error)

	// State returns the current container's state information.
	//
	// errors:
	// Systemerror - System error.
	State() (*State, error)

	// Returns the current config of the container.
	Config() configs.Config

	// Returns the PIDs inside this container. The PIDs are in the namespace of the calling process.
	//
	// errors:
	// ContainerDestroyed - Container no longer exists,
	// Systemerror - System error.
	//
	// Some of the returned PIDs may no longer refer to processes in the Container, unless
	// the Container state is PAUSED in which case every PID in the slice is valid.
	Processes() ([]int, error)

	// Returns statistics for the container.
	//
	// errors:
	// ContainerDestroyed - Container no longer exists,
	// Systemerror - System error.
	Stats() (*Stats, error)

	// Set resources of container as configured
	//
	// We can use this to change resources when containers are running.
	//
	// errors:
	// Systemerror - System error.
	Set(config configs.Config) error

	// Start a process inside the container. Returns error if process fails to
	// start. You can track process lifecycle with passed Process structure.
	//
	// errors:
	// ContainerDestroyed - Container no longer exists,
	// ConfigInvalid - config is invalid,
	// ContainerPaused - Container is paused,
	// Systemerror - System error.
	Start(process *Process) (err error)

	// Destroys the container after killing all running processes.
	//
	// Any event registrations are removed before the container is destroyed.
	// No error is returned if the container is already destroyed.
	//
	// errors:
	// Systemerror - System error.
	Destroy() error

	// Signal sends the provided signal code to the container's initial process.
	//
	// errors:
	// Systemerror - System error.
	Signal(s os.Signal) error
}

type BaseState struct {
	// ID is the container ID.
	ID string `json:"id"`

	// InitProcessPid is the init process id in the parent namespace.
	InitProcessPid int `json:"init_process_pid"`

	// InitProcessStartTime is the init process start time.
	InitProcessStartTime string `json:"init_process_start"`

	// Config is the container's configuration.
	Config configs.Config `json:"config"`
}

type Console interface {
	io.ReadWriter
	io.Closer

	// Path returns the filesystem path to the slave side of the pty.
	Path() string

	// Fd returns the fd for the master of the pty.
	Fd() uintptr
}

type Error interface {
	error

	// Returns a verbose string including the error message
	// and a representation of the stack trace suitable for
	// printing.
	Detail(w io.Writer) error

	// Returns the error code for this error.
	Code() ErrorCode
}

type ErrorCode int

const (
	// Factory errors
	IdInUse ErrorCode = iota
	InvalidIdFormat

	// Container errors
	ContainerNotExists
	ContainerPaused
	ContainerNotStopped
	ContainerNotRunning

	// Process errors
	ProcessNotExecuted

	// Common errors
	ConfigInvalid
	ConsoleExists
	SystemError
)

type Factory interface {
	// Creates a new container with the given id and starts the initial process inside it.
	// id must be a string containing only letters, digits and underscores and must contain
	// between 1 and 1024 characters, inclusive.
	//
	// The id must not already be in use by an existing container. Containers created using
	// a factory with the same path (and file system) must have distinct ids.
	//
	// Returns the new container with a running process.
	//
	// errors:
	// IdInUse - id is already in use by a container
	// InvalidIdFormat - id has incorrect format
	// ConfigInvalid - config is invalid
	// Systemerror - System error
	//
	// On error, any partially created container parts are cleaned up (the operation is atomic).
	Create(id string, config *configs.Config) (Container, error)

	// Load takes an ID for an existing container and returns the container information
	// from the state.  This presents a read only view of the container.
	//
	// errors:
	// Path does not exist
	// Container is stopped
	// System error
	Load(id string) (Container, error)

	// StartInitialization is an internal API to libcontainer used during the reexec of the
	// container.
	//
	// Errors:
	// Pipe connection error
	// System error
	StartInitialization() error

	// Type returns info string about factory type (e.g. lxc, libcontainer...)
	Type() string
}

type NetworkInterface struct {
	// Name is the name of the network interface.
	Name string

	RxBytes   uint64
	RxPackets uint64
	RxErrors  uint64
	RxDropped uint64
	TxBytes   uint64
	TxPackets uint64
	TxErrors  uint64
	TxDropped uint64
}

type Process struct {
	// The command to be run followed by any arguments.
	Args []string

	// Env specifies the environment variables for the process.
	Env []string

	// User will set the uid and gid of the executing process running inside the container
	// local to the container's user and group configuration.
	User string

	// Cwd will change the processes current working directory inside the container's rootfs.
	Cwd string

	// Stdin is a pointer to a reader which provides the standard input stream.
	Stdin io.Reader

	// Stdout is a pointer to a writer which receives the standard output stream.
	Stdout io.Writer

	// Stderr is a pointer to a writer which receives the standard error stream.
	Stderr io.Writer

	// ExtraFiles specifies additional open files to be inherited by the container
	ExtraFiles []*os.File

	// Capabilities specify the capabilities to keep when executing the process inside the container
	// All capabilities not specified will be dropped from the processes capability mask
	Capabilities []string
	// contains filtered or unexported fields
}

type Status int

const (
	// The container exists and is running.
	Running Status = iota + 1

	// The container exists, it is in the process of being paused.
	Pausing

	// The container exists, but all its processes are paused.
	Paused

	// The container exists, but its state is saved on disk
	Checkpointed

	// The container does not exist.
	Destroyed
)