/*
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 (
	"encoding/json"
	"errors"
	"io"
	"io/ioutil"

	lb "git.giftfish.de/ston1th/haproxy-lb/pkg/api/client"
	lbclient "git.giftfish.de/ston1th/haproxy-lb/pkg/api/v1/client"
	pve "git.giftfish.de/ston1th/pve-go"
	cloudprovider "k8s.io/cloud-provider"
)

const (
	ProviderName = pve.PVEScheme
	scheme       = pve.PVESchemeURL
)

type cloud struct {
	pveClient    *pve.Client
	lbClient     *lbclient.Client
	instances    cloudprovider.Instances
	instancesV2  cloudprovider.InstancesV2
	loadbalancer cloudprovider.LoadBalancer
}

type config struct {
	PVE pve.Config `json:"pve"`
	LB  lb.Config  `json:"lb"`
}

func newCloud(cr io.Reader) (c cloudprovider.Interface, err error) {
	var (
		pveOpts []pve.ClientOption
		lbOpts  []lb.ClientOption
	)
	buf, _ := ioutil.ReadAll(cr)
	if len(buf) != 0 {
		var cfg config
		err = json.Unmarshal(buf, &cfg)
		if err != nil {
			return
		}
		pveOpts, err = pve.ClientOptionsFromConfig(cfg.PVE)
		if err != nil {
			return
		}
		lbOpts, err = lb.ClientOptionsFromConfig(cfg.LB)
		if err != nil {
			return
		}
	} else {
		pveOpts, err = pve.ClientOptionsFromEnv()
		if err != nil {
			return
		}
		lbOpts, err = lb.ClientOptionsFromEnv()
		if err != nil {
			return
		}
	}
	if len(pveOpts) == 0 {
		err = errors.New("missing pve config")
		return
	}
	if len(lbOpts) == 0 {
		err = errors.New("missing lb config")
		return
	}

	pveClient := pve.NewClient(pveOpts...)
	lbClient, err := lbclient.NewClient(lb.NewClient(lbOpts...))

	c = &cloud{
		pveClient:    pveClient,
		lbClient:     lbClient,
		instances:    newInstances(pveClient),
		instancesV2:  newInstancesV2(pveClient),
		loadbalancer: newLoadbalancer(lbClient),
		//zones:     newZones(client, nodeName),
		//routes:    nil,
		//network:   network,
	}
	return
}

func (c *cloud) Initialize(clientBuilder cloudprovider.ControllerClientBuilder, stop <-chan struct{}) {
}

func (c *cloud) Instances() (cloudprovider.Instances, bool) {
	return c.instances, true
}

func (c *cloud) InstancesV2() (cloudprovider.InstancesV2, bool) {
	return c.instancesV2, true
}

func (c *cloud) Zones() (cloudprovider.Zones, bool) {
	return nil, false
}

func (c *cloud) LoadBalancer() (cloudprovider.LoadBalancer, bool) {
	return c.loadbalancer, true
}

func (c *cloud) Clusters() (cloudprovider.Clusters, bool) {
	return nil, false
}

func (c *cloud) Routes() (cloudprovider.Routes, bool) {
	return nil, false
}

func (c *cloud) ProviderName() string {
	return ProviderName
}

func (c *cloud) ScrubDNS(nameservers, searches []string) (nsOut, srchOut []string) {
	return nil, nil
}

func (c *cloud) HasClusterID() bool {
	return true
}

func init() {
	cloudprovider.RegisterCloudProvider(ProviderName, func(config io.Reader) (cloudprovider.Interface, error) {
		return newCloud(config)
	})
}