/*
   Copyright 2014 CoreOS, Inc.

   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 command

import (
	"fmt"

	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/go-etcd/etcd"
)

func NewLsCommand() cli.Command {
	return cli.Command{
		Name:  "ls",
		Usage: "retrieve a directory",
		Flags: []cli.Flag{
			cli.BoolFlag{Name: "sort", Usage: "returns result in sorted order"},
			cli.BoolFlag{Name: "recursive", Usage: "returns all values for key and child keys"},
			cli.BoolFlag{Name: "p", Usage: "append slash (/) to directories"},
		},
		Action: func(c *cli.Context) {
			handleLs(c, lsCommandFunc)
		},
	}
}

// handleLs handles a request that intends to do ls-like operations.
func handleLs(c *cli.Context, fn handlerFunc) {
	handleContextualPrint(c, fn, printLs)
}

// printLs writes a response out in a manner similar to the `ls` command in unix.
// Non-empty directories list their contents and files list their name.
func printLs(c *cli.Context, resp *etcd.Response, format string) {
	if !resp.Node.Dir {
		fmt.Println(resp.Node.Key)
	}
	for _, node := range resp.Node.Nodes {
		rPrint(c, node)
	}
}

// lsCommandFunc executes the "ls" command.
func lsCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	key := "/"
	if len(c.Args()) != 0 {
		key = c.Args()[0]
	}
	recursive := c.Bool("recursive")
	sort := c.Bool("sort")

	// Retrieve the value from the server.
	return client.Get(key, sort, recursive)
}

// rPrint recursively prints out the nodes in the node structure.
func rPrint(c *cli.Context, n *etcd.Node) {

	if n.Dir && c.Bool("p") {
		fmt.Println(fmt.Sprintf("%v/", n.Key))
	} else {
		fmt.Println(n.Key)
	}

	for _, node := range n.Nodes {
		rPrint(c, node)
	}
}