package df

import (
	"b612.me/starlog"
	"b612.me/staros"
	"b612.me/wincmd/ntfs/mft"
	"fmt"
	"github.com/spf13/cobra"
	"io/ioutil"
	"math"
	"os"
	"path/filepath"
	"sort"
	"strings"
)

var Cmd = &cobra.Command{
	Use:   "df",
	Short: "分析nfts磁盘文件占用",
	Long:  "分析nfts磁盘文件占用",
	Run: func(cmd *cobra.Command, args []string) {
		if !staros.IsRoot() {
			starlog.Criticalln("need administator permission to run this command")
			os.Exit(1)
		}
		if len(args) == 0 {
			os.Exit(folderSize("./"))
		}
		os.Exit(folderSize(args[0]))
	},
}

func folderSize(path string) int {
	fullPath, err := filepath.Abs(path)
	if err != nil {
		starlog.Criticalln("filepath not a vaild path", path, err)
		return 1
	}
	vol := filepath.VolumeName(fullPath) + `\`
	fmt.Println(vol)
	if staros.IsFile(fullPath) {
		fullPath = filepath.Dir(fullPath)
	}
	fmt.Println("consider folder is", fullPath)
	folderLists, err := ioutil.ReadDir(fullPath)
	if err != nil {
		starlog.Criticalln("read folder failed", err)
		return 2
	}
	targetFolders := make(map[string]uint64)
	for _, v := range folderLists {
		if v.IsDir() {
			//fmt.Println(filepath.Join(fullPath, v.Name()))
			targetFolders[filepath.Join(fullPath, v.Name())] = 0
		}
	}
	fileLists, err := mft.GetFileListsByMft(vol)
	if err != nil {
		starlog.Errorln("read mft failed", err)
		return 3
	}
	var totalSize uint64
	var fc1, fc2 int
	for _, v := range fileLists {
		if strings.Contains(v.Path, fullPath) {
			if v.IsDir {
				fc2++
			} else {
				fc1++
			}
			totalSize += v.Aszie
		}
		for k, _ := range targetFolders {
			if strings.Contains(v.Path, k) {
				targetFolders[k] += v.Aszie
			}
		}
	}
	getSize := func(size uint64) string {
		floatSize := float64(size)
		var sizeC = []string{"byte", "KB", "MB", "GB", "TB"}
		if floatSize < 1024 {
			return ""
		}
		for i := 0; i < 4; i++ {
			if floatSize/math.Pow(1024, float64(i+1)) < 1024 {
				return fmt.Sprintf("%.4f%s", floatSize/math.Pow(1024, float64(i+1)), sizeC[i+1])
			}
		}
		return ""
	}
	target := sortMapByValue(targetFolders)
	for _, v := range target {
		fmt.Printf("%-20s   %-10d   %s\n", v.Key, v.Value, getSize(v.Value))
	}
	fmt.Printf("%-20s   %-10d   %s\n", fullPath, totalSize, getSize(totalSize))
	fmt.Println("file count:", fc1, "folder count:", fc2)
	return 0
}

type Pair struct {
	Key   string
	Value uint64
}
type PairList []Pair

func (p PairList) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
func (p PairList) Len() int           { return len(p) }
func (p PairList) Less(i, j int) bool { return p[i].Value < p[j].Value }

func sortMapByValue(m map[string]uint64) PairList {
	p := make(PairList, len(m))
	i := 0
	for k, v := range m {
		p[i] = Pair{k, v}
		i++
	}
	sort.Sort(p)
	return p
}