package client

import (
	"errors"
	"fmt"
)

// ErrConnectionFailed is an error raised when the connection between the client and the server failed.
var ErrConnectionFailed = errors.New("Cannot connect to the Docker daemon. Is the docker daemon running on this host?")

type notFound interface {
	error
	NotFound() bool // Is the error a NotFound error
}

// IsErrNotFound returns true if the error is caused with an
// object (image, container, network, volume, …) is not found in the docker host.
func IsErrNotFound(err error) bool {
	te, ok := err.(notFound)
	return ok && te.NotFound()
}

// imageNotFoundError implements an error returned when an image is not in the docker host.
type imageNotFoundError struct {
	imageID string
}

// NoFound indicates that this error type is of NotFound
func (e imageNotFoundError) NotFound() bool {
	return true
}

// Error returns a string representation of an imageNotFoundError
func (e imageNotFoundError) Error() string {
	return fmt.Sprintf("Error: No such image: %s", e.imageID)
}

// IsErrImageNotFound returns true if the error is caused
// when an image is not found in the docker host.
func IsErrImageNotFound(err error) bool {
	return IsErrNotFound(err)
}

// containerNotFoundError implements an error returned when a container is not in the docker host.
type containerNotFoundError struct {
	containerID string
}

// NoFound indicates that this error type is of NotFound
func (e containerNotFoundError) NotFound() bool {
	return true
}

// Error returns a string representation of a containerNotFoundError
func (e containerNotFoundError) Error() string {
	return fmt.Sprintf("Error: No such container: %s", e.containerID)
}

// IsErrContainerNotFound returns true if the error is caused
// when a container is not found in the docker host.
func IsErrContainerNotFound(err error) bool {
	return IsErrNotFound(err)
}

// networkNotFoundError implements an error returned when a network is not in the docker host.
type networkNotFoundError struct {
	networkID string
}

// NoFound indicates that this error type is of NotFound
func (e networkNotFoundError) NotFound() bool {
	return true
}

// Error returns a string representation of a networkNotFoundError
func (e networkNotFoundError) Error() string {
	return fmt.Sprintf("Error: No such network: %s", e.networkID)
}

// IsErrNetworkNotFound returns true if the error is caused
// when a network is not found in the docker host.
func IsErrNetworkNotFound(err error) bool {
	return IsErrNotFound(err)
}

// volumeNotFoundError implements an error returned when a volume is not in the docker host.
type volumeNotFoundError struct {
	volumeID string
}

// NoFound indicates that this error type is of NotFound
func (e volumeNotFoundError) NotFound() bool {
	return true
}

// Error returns a string representation of a networkNotFoundError
func (e volumeNotFoundError) Error() string {
	return fmt.Sprintf("Error: No such volume: %s", e.volumeID)
}

// IsErrVolumeNotFound returns true if the error is caused
// when a volume is not found in the docker host.
func IsErrVolumeNotFound(err error) bool {
	return IsErrNotFound(err)
}

// unauthorizedError represents an authorization error in a remote registry.
type unauthorizedError struct {
	cause error
}

// Error returns a string representation of an unauthorizedError
func (u unauthorizedError) Error() string {
	return u.cause.Error()
}

// IsErrUnauthorized returns true if the error is caused
// when a remote registry authentication fails
func IsErrUnauthorized(err error) bool {
	_, ok := err.(unauthorizedError)
	return ok
}