//本程式 主要功能是把A資料夾下的檔案與B目錄下檔案對比，如果找到就覆蓋到B相應的目錄下。
// 用法： merge A目錄 B目錄
// merge.go

package main

import (
    "flag"
    "fmt"
    "os"
    "path/filepath"
    "strings"
    "time"
        "github.com/Unknwon/com"
)

const (
    IsDirectory = iota
    IsRegular
    IsSymlink
)

type sysFile struct {
    fType  int
 

    fName  string
    fLink  string
    fSize  int64
    fMtime time.Time
    fPerm  os.FileMode
}

type F struct {
    files []*sysFile
}

func (self *F) visit(path string, f os.FileInfo, err error) error {
    if f == nil {
        return err
    }
    var tp int
    if f.IsDir() {
        tp = IsDirectory
    } else
 
 if (f.Mode() & os.ModeSymlink) > 0 {
        tp = IsSymlink
    } else {
        tp = IsRegular
    }
    inoFile := &sysFile{
        fName:  path,
        fType:  tp,
        fPerm:  f.Mode(),
        fMtime: f.ModTime(),
        fSize:  f.Size(),
    }
    self.files = append(self.files, inoFile)
    return
 
 nil
}

func main() {
    flag.Parse()
    sourcedir := flag.Arg(0)
    decdir := flag.Arg(1)

    source := F{
        files: make([]*sysFile, 0),
    }
    err := filepath.Walk(sourcedir, func(path string, f os.FileInfo, err error) error {
        return source.visit(path, f, err)
    })

    if err != nil {
        fmt.Printf("filepath.Walk() returned %v\n", err)
    }

    dec := F{
        files: make([]*sysFile, 0),
    }
    err = filepath.Walk(decdir, func(path string, f os.FileInfo, err error) error {
        return dec.visit(path, f, err)
    })

    if err != nil {
        fmt.Printf("filepath.Walk() returned %v\n", err)
    }

    for _, v := range source.files {

        if com.IsFile(v.fName) == true {

            tmp1 := strings.Split(v.fName, "\\")
            sourcename := tmp1[len(tmp1)-1]

            for _, r := range dec.files {
                if com.IsFile(r.fName) == true {

                    tmp2 := strings.Split(r.fName, "\\")
                    decname := tmp2[len(tmp2)-1]

                    if sourcename == decname {
                        fmt.Printf("the same file: %s\n", sourcename)
                        com.Copy(v.fName, r.fName)
                    }
                }
            }

        }
    }

}