/*
Copyright 2016 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 azure_dd

import (
	"fmt"
	"os"
	"testing"
	"time"

	"k8s.io/kubernetes/pkg/util/exec"
)

type fakeFileInfo struct {
	name string
}

func (fi *fakeFileInfo) Name() string {
	return fi.name
}

func (fi *fakeFileInfo) Size() int64 {
	return 0
}

func (fi *fakeFileInfo) Mode() os.FileMode {
	return 777
}

func (fi *fakeFileInfo) ModTime() time.Time {
	return time.Now()
}
func (fi *fakeFileInfo) IsDir() bool {
	return false
}

func (fi *fakeFileInfo) Sys() interface{} {
	return nil
}

var (
	lun       = 1
	lunStr    = "1"
	diskPath  = "4:0:0:" + lunStr
	devName   = "sdd"
	lun1      = 2
	lunStr1   = "2"
	diskPath1 = "3:0:0:" + lunStr1
	devName1  = "sde"
)

type fakeIOHandler struct{}

func (handler *fakeIOHandler) ReadDir(dirname string) ([]os.FileInfo, error) {
	switch dirname {
	case "/sys/bus/scsi/devices":
		f1 := &fakeFileInfo{
			name: "3:0:0:1",
		}
		f2 := &fakeFileInfo{
			name: "4:0:0:0",
		}
		f3 := &fakeFileInfo{
			name: diskPath,
		}
		f4 := &fakeFileInfo{
			name: "host1",
		}
		f5 := &fakeFileInfo{
			name: "target2:0:0",
		}
		return []os.FileInfo{f1, f2, f3, f4, f5}, nil
	case "/sys/bus/scsi/devices/" + diskPath + "/block":
		n := &fakeFileInfo{
			name: devName,
		}
		return []os.FileInfo{n}, nil
	case "/sys/bus/scsi/devices/" + diskPath1 + "/block":
		n := &fakeFileInfo{
			name: devName1,
		}
		return []os.FileInfo{n}, nil
	}
	return nil, fmt.Errorf("bad dir")
}

func (handler *fakeIOHandler) WriteFile(filename string, data []byte, perm os.FileMode) error {
	return nil
}

func (handler *fakeIOHandler) Readlink(name string) (string, error) {
	return "/dev/azure/disk/sda", nil
}

func TestIoHandler(t *testing.T) {
	var fcmd exec.FakeCmd
	fcmd = exec.FakeCmd{
		CombinedOutputScript: []exec.FakeCombinedOutputAction{
			// cat
			func() ([]byte, error) {
				return []byte("Msft    \nVirtual Disk \n"), nil
			},
			// cat
			func() ([]byte, error) {
				return []byte("Msft    \nVirtual Disk \n"), nil
			},
		},
	}
	fake := exec.FakeExec{
		CommandScript: []exec.FakeCommandAction{
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
			func(cmd string, args ...string) exec.Cmd { return exec.InitFakeCmd(&fcmd, cmd, args...) },
		},
	}
	disk, err := findDiskByLun(lun, &fakeIOHandler{}, &fake)
	// if no disk matches lun, exit
	if disk != "/dev/"+devName || err != nil {
		t.Errorf("no data disk found: disk %v err %v", disk, err)
	}
}