/*
Copyright 2018 The Kubernetes Authors.

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 cephfs

import (
	"fmt"

	"github.com/golang/glog"
	"golang.org/x/net/context"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"

	"github.com/container-storage-interface/spec/lib/go/csi"
	"github.com/kubernetes-csi/drivers/pkg/csi-common"
)

type controllerServer struct {
	*csicommon.DefaultControllerServer
}

const (
	oneGB = 1073741824
)

func GetVersionString(v *csi.Version) string {
	return fmt.Sprintf("%d.%d.%d", v.GetMajor(), v.GetMinor(), v.GetPatch())
}

func (cs *controllerServer) validateRequest(v *csi.Version) error {
	if v == nil {
		return status.Error(codes.InvalidArgument, "Version missing in request")
	}

	return cs.Driver.ValidateControllerServiceRequest(v, csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME)
}

func (cs *controllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error) {
	if err := cs.validateRequest(req.Version); err != nil {
		glog.Warningf("invalid create volume request: %v", req)
		return nil, err
	}

	volOptions, err := newVolumeOptions(req.GetParameters())
	if err != nil {
		return nil, err
	}

	volId := newVolumeIdentifier(volOptions, req)
	volSz := int64(oneGB)

	if req.GetCapacityRange() != nil {
		volSz = int64(req.GetCapacityRange().GetRequiredBytes())
	}

	vol, err := newVolume(volId, volOptions)
	if err != nil {
		glog.Errorf("failed to create a volume: %v", err)
		return nil, status.Error(codes.Internal, err.Error())
	}

	glog.V(4).Infof("cephfs: volume created at %s", vol.Root)

	return &csi.CreateVolumeResponse{
		Volume: &csi.Volume{
			Id:            volId.id,
			CapacityBytes: volSz,
			Attributes:    vol.makeMap(),
		},
	}, nil
}

func (cs *controllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVolumeRequest) (*csi.DeleteVolumeResponse, error) {
	if err := cs.validateRequest(req.Version); err != nil {
		glog.Warningf("invalid delete volume request: %v", req)
		return nil, err
	}

	// TODO

	return &csi.DeleteVolumeResponse{}, nil
}

func (cs *controllerServer) ValidateVolumeCapabilities(ctx context.Context, req *csi.ValidateVolumeCapabilitiesRequest) (*csi.ValidateVolumeCapabilitiesResponse, error) {
	return &csi.ValidateVolumeCapabilitiesResponse{Supported: true}, nil
}