/*
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"

	cloudprovider "k8s.io/cloud-provider"

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

type instancesV2 struct {
	client *pve.Client
}

func newInstancesV2(client *pve.Client) *instancesV2 {
	return &instancesV2{client}
}

func (i *instancesV2) InstanceExists(ctx context.Context, node *v1.Node) (exists bool, err error) {
	server, err := i.getServer(ctx, node)
	if err != nil && err != cloudprovider.InstanceNotFound {
		return
	}
	err = nil
	exists = server != nil
	return
}

func (i *instancesV2) InstanceShutdown(ctx context.Context, node *v1.Node) (isOff bool, err error) {
	server, err := i.getServer(ctx, node)
	if err != nil && err != cloudprovider.InstanceNotFound {
		return
	}
	err = nil
	isOff = server != nil && server.Status == pve.ServerStatusStopped
	return
}

func (i *instancesV2) getServer(ctx context.Context, node *v1.Node) (server *pve.Server, err error) {
	if node.Spec.ProviderID != "" {
		server, err = getServerByProviderID(ctx, i.client, node.Spec.ProviderID)
		return
	}
	server, err = getServerByName(ctx, i.client, node.Name)
	if err != nil {
		return
	}
	return getServerByProviderID(ctx, i.client, server.K8sID())
}

func (i *instancesV2) nodeAddresses(ctx context.Context, srv *pve.Server) []v1.NodeAddress {
	var internalIP string
	ipc := srv.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: srv.Name},
		{Type: v1.NodeInternalIP, Address: internalIP},
	}
	return addrs
}

func (i *instancesV2) InstanceMetadata(ctx context.Context, node *v1.Node) (*cloudprovider.InstanceMetadata, error) {
	server, err := i.getServer(ctx, node)
	if err != nil {
		return nil, err
	}
	return &cloudprovider.InstanceMetadata{
		ProviderID:    server.K8sID(),
		InstanceType:  InstanceType,
		NodeAddresses: i.nodeAddresses(ctx, server),
	}, nil
}