commands

var FilesCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Manipulate unixfs files.",
		ShortDescription: `
Files is an API for manipulating IPFS objects as if they were a unix
filesystem.

NOTE:
Most of the subcommands of 'ipfs files' accept the '--flush' flag. It defaults
to true. Use caution when setting this flag to false. It will improve
performance for large numbers of file operations, but it does so at the cost
of consistency guarantees. If the daemon is unexpectedly killed before running
'ipfs files flush' on the files in question, then data may be lost. This also
applies to running 'ipfs repo gc' concurrently with '--flush=false'
operations.
`,
	},
	Options: []cmds.Option{
		cmds.BoolOption("flush", "f", "Flush target and ancestors after write. Default: true."),
	},
	Subcommands: map[string]*cmds.Command{
		"read":  FilesReadCmd,
		"write": FilesWriteCmd,
		"mv":    FilesMvCmd,
		"cp":    FilesCpCmd,
		"ls":    FilesLsCmd,
		"mkdir": FilesMkdirCmd,
		"stat":  FilesStatCmd,
		"rm":    FilesRmCmd,
		"flush": FilesFlushCmd,
	},
}

var FilesCpCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Copy files into mfs.",
	},
	Arguments: []cmds.Argument{
		cmds.StringArg("source", true, false, "Source object to copy."),
		cmds.StringArg("dest", true, false, "Destination to copy object to."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		node, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		flush, found, _ := req.Option("flush").Bool()
		if !found {
			flush = true
		}

		src, err := checkPath(req.Arguments()[0])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
		src = strings.TrimRight(src, "/")

		dst, err := checkPath(req.Arguments()[1])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		if dst[len(dst)-1] == '/' {
			dst += gopath.Base(src)
		}

		nd, err := getNodeFromPath(req.Context(), node, src)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		err = mfs.PutNode(node.FilesRoot, dst, nd)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		if flush {
			err := mfs.FlushPath(node.FilesRoot, dst)
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}
		}
	},
}

var FilesFlushCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Flush a given path's data to disk.",
		ShortDescription: `
Flush a given path to disk. This is only useful when other commands
are run with the '--flush=false'.
`,
	},
	Arguments: []cmds.Argument{
		cmds.StringArg("path", false, false, "Path to flush. Default: '/'."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		nd, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		path := "/"
		if len(req.Arguments()) > 0 {
			path = req.Arguments()[0]
		}

		err = mfs.FlushPath(nd.FilesRoot, path)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
	},
}

var FilesLsCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "List directories.",
		ShortDescription: `
List directories.

Examples:

    $ ipfs files ls /welcome/docs/
    about
    contact
    help
    quick-start
    readme
    security-notes

    $ ipfs files ls /myfiles/a/b/c/d
    foo
    bar
`,
	},
	Arguments: []cmds.Argument{
		cmds.StringArg("path", false, false, "Path to show listing for. Defaults to '/'."),
	},
	Options: []cmds.Option{
		cmds.BoolOption("l", "Use long listing format."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		var arg string

		if len(req.Arguments()) == 0 {
			arg = "/"
		} else {
			arg = req.Arguments()[0]
		}

		path, err := checkPath(arg)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		nd, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		fsn, err := mfs.Lookup(nd.FilesRoot, path)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		long, _, _ := req.Option("l").Bool()

		switch fsn := fsn.(type) {
		case *mfs.Directory:
			if !long {
				var output []mfs.NodeListing
				for _, name := range fsn.ListNames() {
					output = append(output, mfs.NodeListing{
						Name: name,
					})
				}
				res.SetOutput(&FilesLsOutput{output})
			} else {
				listing, err := fsn.List()
				if err != nil {
					res.SetError(err, cmds.ErrNormal)
					return
				}
				res.SetOutput(&FilesLsOutput{listing})
			}
			return
		case *mfs.File:
			_, name := gopath.Split(path)
			out := &FilesLsOutput{[]mfs.NodeListing{mfs.NodeListing{Name: name, Type: 1}}}
			res.SetOutput(out)
			return
		default:
			res.SetError(errors.New("unrecognized type"), cmds.ErrNormal)
		}
	},
	Marshalers: cmds.MarshalerMap{
		cmds.Text: func(res cmds.Response) (io.Reader, error) {
			out := res.Output().(*FilesLsOutput)
			buf := new(bytes.Buffer)
			long, _, _ := res.Request().Option("l").Bool()

			for _, o := range out.Entries {
				if long {
					fmt.Fprintf(buf, "%s\t%s\t%d\n", o.Name, o.Hash, o.Size)
				} else {
					fmt.Fprintf(buf, "%s\n", o.Name)
				}
			}
			return buf, nil
		},
	},
	Type: FilesLsOutput{},
}

var FilesMkdirCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Make directories.",
		ShortDescription: `
Create the directory if it does not already exist.

NOTE: All paths must be absolute.

Examples:

    $ ipfs mfs mkdir /test/newdir
    $ ipfs mfs mkdir -p /test/does/not/exist/yet
`,
	},

	Arguments: []cmds.Argument{
		cmds.StringArg("path", true, false, "Path to dir to make."),
	},
	Options: []cmds.Option{
		cmds.BoolOption("parents", "p", "No error if existing, make parent directories as needed."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		n, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		dashp, _, _ := req.Option("parents").Bool()
		dirtomake, err := checkPath(req.Arguments()[0])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		flush, found, _ := req.Option("flush").Bool()
		if !found {
			flush = true
		}

		err = mfs.Mkdir(n.FilesRoot, dirtomake, dashp, flush)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

	},
}

var FilesMvCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Move files.",
		ShortDescription: `
Move files around. Just like traditional unix mv.

Example:

    $ ipfs files mv /myfs/a/b/c /myfs/foo/newc

`,
	},

	Arguments: []cmds.Argument{
		cmds.StringArg("source", true, false, "Source file to move."),
		cmds.StringArg("dest", true, false, "Destination path for file to be moved to."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		n, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		src, err := checkPath(req.Arguments()[0])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
		dst, err := checkPath(req.Arguments()[1])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		err = mfs.Mv(n.FilesRoot, src, dst)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
	},
}

var FilesReadCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Read a file in a given mfs.",
		ShortDescription: `
Read a specified number of bytes from a file at a given offset. By default,
will read the entire file similar to unix cat.

Examples:

    $ ipfs files read /test/hello
    hello
        `,
	},

	Arguments: []cmds.Argument{
		cmds.StringArg("path", true, false, "Path to file to be read."),
	},
	Options: []cmds.Option{
		cmds.IntOption("offset", "o", "Byte offset to begin reading from."),
		cmds.IntOption("count", "n", "Maximum number of bytes to read."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		n, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		path, err := checkPath(req.Arguments()[0])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		fsn, err := mfs.Lookup(n.FilesRoot, path)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		fi, ok := fsn.(*mfs.File)
		if !ok {
			res.SetError(fmt.Errorf("%s was not a file.", path), cmds.ErrNormal)
			return
		}

		rfd, err := fi.Open(mfs.OpenReadOnly, false)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		defer rfd.Close()

		offset, _, err := req.Option("offset").Int()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
		if offset < 0 {
			res.SetError(fmt.Errorf("Cannot specify negative offset."), cmds.ErrNormal)
			return
		}

		filen, err := rfd.Size()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		if int64(offset) > filen {
			res.SetError(fmt.Errorf("Offset was past end of file (%d > %d).", offset, filen), cmds.ErrNormal)
			return
		}

		_, err = rfd.Seek(int64(offset), os.SEEK_SET)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		var r io.Reader = &contextReaderWrapper{R: rfd, ctx: req.Context()}
		count, found, err := req.Option("count").Int()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
		if found {
			if count < 0 {
				res.SetError(fmt.Errorf("Cannot specify negative 'count'."), cmds.ErrNormal)
				return
			}
			r = io.LimitReader(r, int64(count))
		}

		res.SetOutput(r)
	},
}

var FilesRmCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Remove a file.",
		ShortDescription: `
Remove files or directories.

    $ ipfs files rm /foo
    $ ipfs files ls /bar
    cat
    dog
    fish
    $ ipfs files rm -r /bar
`,
	},

	Arguments: []cmds.Argument{
		cmds.StringArg("path", true, true, "File to remove."),
	},
	Options: []cmds.Option{
		cmds.BoolOption("recursive", "r", "Recursively remove directories."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		nd, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		path, err := checkPath(req.Arguments()[0])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		if path == "/" {
			res.SetError(fmt.Errorf("cannot delete root"), cmds.ErrNormal)
			return
		}

		if path[len(path)-1] == '/' {
			path = path[:len(path)-1]
		}

		dir, name := gopath.Split(path)
		parent, err := mfs.Lookup(nd.FilesRoot, dir)
		if err != nil {
			res.SetError(fmt.Errorf("parent lookup: %s", err), cmds.ErrNormal)
			return
		}

		pdir, ok := parent.(*mfs.Directory)
		if !ok {
			res.SetError(fmt.Errorf("No such file or directory: %s", path), cmds.ErrNormal)
			return
		}

		dashr, _, _ := req.Option("r").Bool()

		var success bool
		defer func() {
			if success {
				err := pdir.Flush()
				if err != nil {
					res.SetError(err, cmds.ErrNormal)
					return
				}
			}
		}()

		if dashr {
			err := pdir.Unlink(name)
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}

			success = true
			return
		}

		childi, err := pdir.Child(name)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		switch childi.(type) {
		case *mfs.Directory:
			res.SetError(fmt.Errorf("%s is a directory, use -r to remove directories", path), cmds.ErrNormal)
			return
		default:
			err := pdir.Unlink(name)
			if err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}

			success = true
		}
	},
}

var FilesStatCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Display file status.",
	},

	Arguments: []cmds.Argument{
		cmds.StringArg("path", true, false, "Path to node to stat."),
	},
	Options: []cmds.Option{
		cmds.StringOption("format", "Print statistics in given format. Allowed tokens: "+
			"<hash> <size> <cumulsize> <type> <childs>. Conflicts with other format options.").Default(
			`<hash>
Size: <size>
CumulativeSize: <cumulsize>
ChildBlocks: <childs>
Type: <type>`),
		cmds.BoolOption("hash", "Print only hash. Implies '--format=<hash>'. Conflicts with other format options.").Default(false),
		cmds.BoolOption("size", "Print only size. Implies '--format=<cumulsize>'. Conflicts with other format options.").Default(false),
	},
	Run: func(req cmds.Request, res cmds.Response) {

		_, err := statGetFormatOptions(req)
		if err != nil {
			res.SetError(err, cmds.ErrClient)
		}

		node, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		path, err := checkPath(req.Arguments()[0])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		fsn, err := mfs.Lookup(node.FilesRoot, path)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		o, err := statNode(node.DAG, fsn)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		res.SetOutput(o)
	},
	Marshalers: cmds.MarshalerMap{
		cmds.Text: func(res cmds.Response) (io.Reader, error) {

			out := res.Output().(*Object)
			buf := new(bytes.Buffer)

			s, _ := statGetFormatOptions(res.Request())
			s = strings.Replace(s, "<hash>", out.Hash, -1)
			s = strings.Replace(s, "<size>", fmt.Sprintf("%d", out.Size), -1)
			s = strings.Replace(s, "<cumulsize>", fmt.Sprintf("%d", out.CumulativeSize), -1)
			s = strings.Replace(s, "<childs>", fmt.Sprintf("%d", out.Blocks), -1)
			s = strings.Replace(s, "<type>", out.Type, -1)

			fmt.Fprintln(buf, s)
			return buf, nil
		},
	},
	Type: Object{},
}

var FilesWriteCmd = &cmds.Command{
	Helptext: cmds.HelpText{
		Tagline: "Write to a mutable file in a given filesystem.",
		ShortDescription: `
Write data to a file in a given filesystem. This command allows you to specify
a beginning offset to write to. The entire length of the input will be written.

If the '--create' option is specified, the file will be created if it does not
exist. Nonexistant intermediate directories will not be created.

If the '--flush' option is set to false, changes will not be propogated to the
merkledag root. This can make operations much faster when doing a large number
of writes to a deeper directory structure.

EXAMPLE:

    echo "hello world" | ipfs files write --create /myfs/a/b/file
    echo "hello world" | ipfs files write --truncate /myfs/a/b/file

WARNING:

Usage of the '--flush=false' option does not guarantee data durability until
the tree has been flushed. This can be accomplished by running 'ipfs files
stat' on the file or any of its ancestors.
`,
	},
	Arguments: []cmds.Argument{
		cmds.StringArg("path", true, false, "Path to write to."),
		cmds.FileArg("data", true, false, "Data to write.").EnableStdin(),
	},
	Options: []cmds.Option{
		cmds.IntOption("offset", "o", "Byte offset to begin writing at."),
		cmds.BoolOption("create", "e", "Create the file if it does not exist."),
		cmds.BoolOption("truncate", "t", "Truncate the file to size zero before writing."),
		cmds.IntOption("count", "n", "Maximum number of bytes to read."),
	},
	Run: func(req cmds.Request, res cmds.Response) {
		path, err := checkPath(req.Arguments()[0])
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		create, _, _ := req.Option("create").Bool()
		trunc, _, _ := req.Option("truncate").Bool()
		flush, fset, _ := req.Option("flush").Bool()
		if !fset {
			flush = true
		}

		nd, err := req.InvocContext().GetNode()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		offset, _, err := req.Option("offset").Int()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
		if offset < 0 {
			res.SetError(fmt.Errorf("cannot have negative write offset"), cmds.ErrNormal)
			return
		}

		fi, err := getFileHandle(nd.FilesRoot, path, create)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		wfd, err := fi.Open(mfs.OpenWriteOnly, flush)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		defer wfd.Close()

		if trunc {
			if err := wfd.Truncate(0); err != nil {
				res.SetError(err, cmds.ErrNormal)
				return
			}
		}

		count, countfound, err := req.Option("count").Int()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}
		if countfound && count < 0 {
			res.SetError(fmt.Errorf("cannot have negative byte count"), cmds.ErrNormal)
			return
		}

		_, err = wfd.Seek(int64(offset), os.SEEK_SET)
		if err != nil {
			log.Error("seekfail: ", err)
			res.SetError(err, cmds.ErrNormal)
			return
		}

		input, err := req.Files().NextFile()
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		var r io.Reader = input
		if countfound {
			r = io.LimitReader(r, int64(count))
		}

		n, err := io.Copy(wfd, input)
		if err != nil {
			res.SetError(err, cmds.ErrNormal)
			return
		}

		log.Debugf("wrote %d bytes to %s", n, path)
	},
}