/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package pvecloud

import (
	"context"
	"net"
	"strings"

	cloudprovider "k8s.io/cloud-provider"

	pve "git.giftfish.de/ston1th/pve-go"
	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/types"
)

// InstanceType is not implemented
const InstanceType = "pveServer"

type instances struct {
	client *pve.Client
}

func newInstances(client *pve.Client) *instances {
	return &instances{client}
}

func (i *instances) NodeAddressesByProviderID(ctx context.Context, providerID string) ([]v1.NodeAddress, error) {
	server, err := getServerByProviderID(ctx, i.client, providerID)
	if err != nil {
		return nil, err
	}
	return i.nodeAddresses(ctx, server), nil
}

func (i *instances) NodeAddresses(ctx context.Context, nodeName types.NodeName) ([]v1.NodeAddress, error) {
	server, err := getServerByName(ctx, i.client, string(nodeName))
	if err != nil {
		return nil, err
	}
	server, err = getServerByProviderID(ctx, i.client, server.K8sID())
	if err != nil {
		return nil, err
	}
	return i.nodeAddresses(ctx, server), nil
}

func (i *instances) InstanceID(ctx context.Context, nodeName types.NodeName) (string, error) {
	server, err := getServerByName(ctx, i.client, string(nodeName))
	if err != nil {
		return "", err
	}
	return strings.TrimPrefix(server.K8sID(), scheme), nil
}

func (i *instances) InstanceType(ctx context.Context, nodeName types.NodeName) (string, error) {
	/*
		server, err := getServerByName(ctx, i.client, string(nodeName))
		if err != nil {
			return "", err
		}
		return server.ServerType.Name, nil
	*/
	return InstanceType, nil
}

func (i *instances) InstanceTypeByProviderID(ctx context.Context, providerID string) (string, error) {
	/*
		id, err := providerIDToServerID(providerID)
		if err != nil {
			return "", err
		}

		server, err := getServerByID(ctx, i.client, id)
		if err != nil {
			return "", err
		}
		return server.ServerType.Name, nil
	*/
	return InstanceType, nil
}

func (i *instances) AddSSHKeyToAllInstances(ctx context.Context, user string, keyData []byte) error {
	return cloudprovider.NotImplemented
}

func (i *instances) CurrentNodeName(ctx context.Context, hostname string) (types.NodeName, error) {
	return types.NodeName(hostname), nil
}

func (i *instances) InstanceExistsByProviderID(ctx context.Context, providerID string) (exists bool, err error) {
	server, err := getServerByProviderID(ctx, i.client, providerID)
	if err != nil && err != cloudprovider.InstanceNotFound {
		return
	}
	err = nil
	exists = server != nil
	return
}

func (i *instances) InstanceShutdownByProviderID(ctx context.Context, providerID string) (isOff bool, err error) {
	server, err := getServerByProviderID(ctx, i.client, providerID)
	if err != nil && err != cloudprovider.InstanceNotFound {
		return
	}
	err = nil
	isOff = server != nil && server.Status == pve.ServerStatusStopped
	return
}

/*
// TODO
func (i *instances) InstanceMetadataByProviderID(ctx context.Context, providerID string) (*cloudprovider.InstanceMetadata, error) {
	addrs, err := i.NodeAddressesByProviderID(ctx, providerID)
	if err != nil {
		return nil, err
	}
	return &cloudprovider.InstanceMetadata{
		ProviderID:    providerID,
		NodeAddresses: addrs,
	}, nil
}
*/

func (i *instances) nodeAddresses(ctx context.Context, server *pve.Server) []v1.NodeAddress {
	var internalIP string
	ipc := server.IPConfig.Get(0)
	if ipc != nil {
		ip, _, err := net.ParseCIDR(ipc.IPv4CIDR)
		if err == nil {
			internalIP = ip.String()
		}
	}
	addrs := []v1.NodeAddress{
		{Type: v1.NodeHostName, Address: server.Name},
		{Type: v1.NodeInternalIP, Address: internalIP},
	}
	return addrs
}