/*
Copyright 2017 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 nfs

import (
	"runtime"
	"strings"

	"github.com/container-storage-interface/spec/lib/go/csi"
	"k8s.io/klog/v2"
	mount "k8s.io/mount-utils"
)

// DriverOptions defines driver parameters specified in driver deployment
type DriverOptions struct {
	NodeID                string
	DriverName            string
	Endpoint              string
	MountPermissions      uint64
	WorkingMountDir       string
	DefaultOnDeletePolicy string
}

type Driver struct {
	name                  string
	nodeID                string
	version               string
	endpoint              string
	mountPermissions      uint64
	workingMountDir       string
	defaultOnDeletePolicy string

	//ids *identityServer
	ns          *NodeServer
	cscap       []*csi.ControllerServiceCapability
	nscap       []*csi.NodeServiceCapability
	volumeLocks *VolumeLocks
}

const (
	DefaultDriverName = "nfs.csi.k8s.io"
	// Address of the NFS server
	paramServer = "server"
	// Base directory of the NFS server to create volumes under.
	// The base directory must be a direct child of the root directory.
	// The root directory is omitted from the string, for example:
	//     "base" instead of "/base"
	paramShare            = "share"
	paramSubDir           = "subdir"
	paramOnDelete         = "ondelete"
	mountOptionsField     = "mountoptions"
	mountPermissionsField = "mountpermissions"
	pvcNameKey            = "csi.storage.k8s.io/pvc/name"
	pvcNamespaceKey       = "csi.storage.k8s.io/pvc/namespace"
	pvNameKey             = "csi.storage.k8s.io/pv/name"
	pvcNameMetadata       = "${pvc.metadata.name}"
	pvcNamespaceMetadata  = "${pvc.metadata.namespace}"
	pvNameMetadata        = "${pv.metadata.name}"
)

func NewDriver(options *DriverOptions) *Driver {
	klog.V(2).Infof("Driver: %v version: %v", options.DriverName, driverVersion)

	n := &Driver{
		name:             options.DriverName,
		version:          driverVersion,
		nodeID:           options.NodeID,
		endpoint:         options.Endpoint,
		mountPermissions: options.MountPermissions,
		workingMountDir:  options.WorkingMountDir,
	}

	n.AddControllerServiceCapabilities([]csi.ControllerServiceCapability_RPC_Type{
		csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
		csi.ControllerServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER,
		csi.ControllerServiceCapability_RPC_CLONE_VOLUME,
		csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT,
	})

	n.AddNodeServiceCapabilities([]csi.NodeServiceCapability_RPC_Type{
		csi.NodeServiceCapability_RPC_GET_VOLUME_STATS,
		csi.NodeServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER,
		csi.NodeServiceCapability_RPC_UNKNOWN,
	})
	n.volumeLocks = NewVolumeLocks()
	return n
}

func NewNodeServer(n *Driver, mounter mount.Interface) *NodeServer {
	return &NodeServer{
		Driver:  n,
		mounter: mounter,
	}
}

func (n *Driver) Run(testMode bool) {
	versionMeta, err := GetVersionYAML(n.name)
	if err != nil {
		klog.Fatalf("%v", err)
	}
	klog.V(2).Infof("\nDRIVER INFORMATION:\n-------------------\n%s\n\nStreaming logs below:", versionMeta)

	mounter := mount.New("")
	if runtime.GOOS == "linux" {
		// MounterForceUnmounter is only implemented on Linux now
		mounter = mounter.(mount.MounterForceUnmounter)
	}
	n.ns = NewNodeServer(n, mounter)
	s := NewNonBlockingGRPCServer()
	s.Start(n.endpoint,
		NewDefaultIdentityServer(n),
		// NFS plugin has not implemented ControllerServer
		// using default controllerserver.
		NewControllerServer(n),
		n.ns,
		testMode)
	s.Wait()
}

func (n *Driver) AddControllerServiceCapabilities(cl []csi.ControllerServiceCapability_RPC_Type) {
	var csc []*csi.ControllerServiceCapability
	for _, c := range cl {
		csc = append(csc, NewControllerServiceCapability(c))
	}
	n.cscap = csc
}

func (n *Driver) AddNodeServiceCapabilities(nl []csi.NodeServiceCapability_RPC_Type) {
	var nsc []*csi.NodeServiceCapability
	for _, n := range nl {
		nsc = append(nsc, NewNodeServiceCapability(n))
	}
	n.nscap = nsc
}

func IsCorruptedDir(dir string) bool {
	_, pathErr := mount.PathExists(dir)
	return pathErr != nil && mount.IsCorruptedMnt(pathErr)
}

// replaceWithMap replace key with value for str
func replaceWithMap(str string, m map[string]string) string {
	for k, v := range m {
		if k != "" {
			str = strings.ReplaceAll(str, k, v)
		}
	}
	return str
}