package providers

import (
	"context"
	"io"

	"github.com/virtual-kubelet/virtual-kubelet/vkubelet"
	"github.com/virtual-kubelet/virtual-kubelet/vkubelet/api"
	v1 "k8s.io/api/core/v1"
	stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
)

// Provider contains the methods required to implement a virtual-kubelet provider.
type Provider interface {
	vkubelet.PodLifecycleHandler

	// GetContainerLogs retrieves the logs of a container by name from the provider.
	GetContainerLogs(ctx context.Context, namespace, podName, containerName string, opts api.ContainerLogOpts) (io.ReadCloser, error)

	// RunInContainer executes a command in a container in the pod, copying data
	// between in/out/err and the container's stdin/stdout/stderr.
	RunInContainer(ctx context.Context, namespace, podName, containerName string, cmd []string, attach api.AttachIO) error

	// Capacity returns a resource list with the capacity constraints of the provider.
	Capacity(context.Context) v1.ResourceList

	// NodeConditions returns a list of conditions (Ready, OutOfDisk, etc), which is
	// polled periodically to update the node status within Kubernetes.
	NodeConditions(context.Context) []v1.NodeCondition

	// NodeAddresses returns a list of addresses for the node status
	// within Kubernetes.
	NodeAddresses(context.Context) []v1.NodeAddress

	// NodeDaemonEndpoints returns NodeDaemonEndpoints for the node status
	// within Kubernetes.
	NodeDaemonEndpoints(context.Context) *v1.NodeDaemonEndpoints

	// OperatingSystem returns the operating system the provider is for.
	OperatingSystem() string
}

// PodMetricsProvider is an optional interface that providers can implement to expose pod stats
type PodMetricsProvider interface {
	GetStatsSummary(context.Context) (*stats.Summary, error)
}