/*
Copyright 2020 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 (
	"os"
	"path/filepath"
	"reflect"
	"testing"

	"fmt"

	"github.com/container-storage-interface/spec/lib/go/csi"
	"golang.org/x/net/context"
	"k8s.io/utils/mount"
)

const (
	testServer    = "test-server"
	testBaseDir   = "test-base-dir"
	testCSIVolume = "test-csi"
	testVolumeID  = "test-server/test-base-dir/test-csi"
)

// for Windows support in the future
var (
	testShare = filepath.Join(string(filepath.Separator), testBaseDir, string(filepath.Separator), testCSIVolume)
)

func initTestController(t *testing.T) *ControllerServer {
	var perm *uint32
	mounter := &mount.FakeMounter{MountPoints: []mount.MountPoint{}}
	driver := NewNFSdriver("", "", perm)
	driver.ns = NewNodeServer(driver, mounter)
	return NewControllerServer(driver)
}

func teardown() {
	err := os.RemoveAll("/tmp/" + testCSIVolume)

	if err != nil {
		fmt.Print(err.Error())
		fmt.Printf("\n")
		fmt.Printf("\033[1;91m%s\033[0m\n", "> Teardown failed")
	} else {
		fmt.Printf("\033[1;36m%s\033[0m\n", "> Teardown completed")
	}
}

func TestMain(m *testing.M) {
	code := m.Run()
	teardown()
	os.Exit(code)
}

func TestCreateVolume(t *testing.T) {
	cases := []struct {
		name      string
		req       *csi.CreateVolumeRequest
		resp      *csi.CreateVolumeResponse
		expectErr bool
	}{
		{
			name: "valid defaults",
			req: &csi.CreateVolumeRequest{
				Name: testCSIVolume,
				VolumeCapabilities: []*csi.VolumeCapability{
					{
						AccessType: &csi.VolumeCapability_Mount{
							Mount: &csi.VolumeCapability_MountVolume{},
						},
						AccessMode: &csi.VolumeCapability_AccessMode{
							Mode: csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
						},
					},
				},
				Parameters: map[string]string{
					paramServer: testServer,
					paramShare:  testBaseDir,
				},
			},
			resp: &csi.CreateVolumeResponse{
				Volume: &csi.Volume{
					VolumeId: testVolumeID,
					VolumeContext: map[string]string{
						paramServer: testServer,
						paramShare:  testShare,
					},
				},
			},
		},
		{
			name: "name empty",
			req: &csi.CreateVolumeRequest{
				VolumeCapabilities: []*csi.VolumeCapability{
					{
						AccessType: &csi.VolumeCapability_Mount{
							Mount: &csi.VolumeCapability_MountVolume{},
						},
						AccessMode: &csi.VolumeCapability_AccessMode{
							Mode: csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
						},
					},
				},
				Parameters: map[string]string{
					paramServer: testServer,
					paramShare:  testBaseDir,
				},
			},
			expectErr: true,
		},
		{
			name: "invalid volume capability",
			req: &csi.CreateVolumeRequest{
				Name: testCSIVolume,
				VolumeCapabilities: []*csi.VolumeCapability{
					{
						AccessMode: &csi.VolumeCapability_AccessMode{
							Mode: csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
						},
					},
				},
				Parameters: map[string]string{
					paramServer: testServer,
					paramShare:  testBaseDir,
				},
			},
			expectErr: true,
		},
		{
			name: "invalid create context",
			req: &csi.CreateVolumeRequest{
				Name: testCSIVolume,
				VolumeCapabilities: []*csi.VolumeCapability{
					{
						AccessType: &csi.VolumeCapability_Mount{
							Mount: &csi.VolumeCapability_MountVolume{},
						},
						AccessMode: &csi.VolumeCapability_AccessMode{
							Mode: csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
						},
					},
				},
				Parameters: map[string]string{
					"unknown-parameter": "foo",
				},
			},
			expectErr: true,
		},
	}

	for _, test := range cases {
		test := test //pin
		t.Run(test.name, func(t *testing.T) {
			// Setup
			cs := initTestController(t)
			// Run
			resp, err := cs.CreateVolume(context.TODO(), test.req)

			// Verify
			if !test.expectErr && err != nil {
				t.Errorf("test %q failed: %v", test.name, err)
			}
			if test.expectErr && err == nil {
				t.Errorf("test %q failed; got success", test.name)
			}
			if !reflect.DeepEqual(resp, test.resp) {
				t.Errorf("test %q failed: got resp %+v, expected %+v", test.name, resp, test.resp)
			}
			if !test.expectErr {
				info, err := os.Stat(filepath.Join(cs.workingMountDir, test.req.Name, test.req.Name))
				if err != nil {
					t.Errorf("test %q failed: couldn't find volume subdirectory: %v", test.name, err)
				}
				if !info.IsDir() {
					t.Errorf("test %q failed: subfile not a directory", test.name)
				}
			}
		})
	}
}