package kubernetes

import (
	"context"
	"errors"
	nomadApi "github.com/hashicorp/nomad/api"
	"io"
	appv1 "k8s.io/api/apps/v1"
	"k8s.io/client-go/kubernetes"
	"k8s.io/client-go/rest"
)

var (
	ErrorNoAllocationFound = errors.New("no allocation found")
)

// apiQuerier provides access to the Nomad functionality.
type apiQuerier interface {
	// init prepares an apiClient to be able to communicate to a provided Nomad API.
	init(nomadConfig *rest.Config) (err error)

	// LoadJobList loads the list of jobs from the Nomad API.
	LoadJobList() (list []*appv1.DeploymentList, err error)

	// JobScale returns the scale of the passed job.
	JobScale(jobID string) (jobScale uint, err error)

	// SetJobScale sets the scaling count of the passed job to Nomad.
	SetJobScale(jobID string, count uint, reason string) (err error)

	// DeleteJob deletes the Job with the given ID.
	DeleteDeployment(name string) (err error)

	// Execute runs a command in the passed job.
	Execute(jobID string, ctx context.Context, command string, tty bool,
		stdin io.Reader, stdout, stderr io.Writer) (int, error)

	// listJobs loads all jobs with the specified prefix.
	listDeployments(namespace string) (jobListStub []*appv1.DeploymentList, err error)

	// job returns the job of the given jobID.
	deployment(name string) (deployment appv1.Deployment, err error)

	// listAllocations loads all allocations.
	listAllocations() (allocationListStub []*nomadApi.AllocationListStub, err error)

	// allocation returns the first allocation of the given job.
	allocation(jobID string) (*nomadApi.Allocation, error)

	// RegisterKubernetesDeployment registers a deployment with Kubernetes.
	// It returns the deployment ID that can be used when listening to the Kubernetes event stream.
	RegisterKubernetesDeployment(deployment appv1.Deployment) (string, error)

	// EventStream returns a Nomad event stream filtered to return only allocation and evaluation events.
	EventStream(ctx context.Context) (<-chan *nomadApi.Events, error)
}

// nomadAPIClient implements the nomadApiQuerier interface and provides access to a real Nomad API.
type kubernetesAPIClient struct {
	client    *kubernetes.Clientset
	namespace string
}

func (k kubernetesAPIClient) init(nomadConfig *rest.Config) (err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) LoadJobList() (list []*appv1.DeploymentList, err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) JobScale(jobID string) (jobScale uint, err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) SetJobScale(jobID string, count uint, reason string) (err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) DeleteDeployment(name string) (err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) Execute(jobID string, ctx context.Context, command string, tty bool, stdin io.Reader, stdout, stderr io.Writer) (int, error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) listDeployments(namespace string) (jobListStub []*appv1.DeploymentList, err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) deployment(name string) (deployment appv1.Deployment, err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) listAllocations() (allocationListStub []*nomadApi.AllocationListStub, err error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) allocation(jobID string) (*nomadApi.Allocation, error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) RegisterKubernetesDeployment(deployment appv1.Deployment) (string, error) {
	//TODO implement me
	panic("implement me")
}

func (k kubernetesAPIClient) EventStream(ctx context.Context) (<-chan *nomadApi.Events, error) {
	//TODO implement me
	panic("implement me")
}