/*
   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 (
	"errors"
	"io"
	"io/ioutil"
	"net/http"
	"net/url"
	"os"
	"strings"

	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/codegangsta/cli"
	"github.com/coreos/etcd/pkg/transport"
)

var (
	ErrNoAvailSrc = errors.New("no available argument and stdin")
)

// trimsplit slices s into all substrings separated by sep and returns a
// slice of the substrings between the separator with all leading and trailing
// white space removed, as defined by Unicode.
func trimsplit(s, sep string) []string {
	raw := strings.Split(s, ",")
	trimmed := make([]string, 0)
	for _, r := range raw {
		trimmed = append(trimmed, strings.TrimSpace(r))
	}
	return trimmed
}

func argOrStdin(args []string, stdin io.Reader, i int) (string, error) {
	if i < len(args) {
		return args[i], nil
	}
	bytes, err := ioutil.ReadAll(stdin)
	if string(bytes) == "" || err != nil {
		return "", ErrNoAvailSrc
	}
	return string(bytes), nil
}

func getPeersFlagValue(c *cli.Context) []string {
	peerstr := c.GlobalString("peers")

	// Use an environment variable if nothing was supplied on the
	// command line
	if peerstr == "" {
		peerstr = os.Getenv("ETCDCTL_PEERS")
	}

	// If we still don't have peers, use a default
	if peerstr == "" {
		peerstr = "127.0.0.1:4001"
	}

	return strings.Split(peerstr, ",")
}

func getEndpoints(c *cli.Context) ([]string, error) {
	eps := getPeersFlagValue(c)
	for i, ep := range eps {
		u, err := url.Parse(ep)
		if err != nil {
			return nil, err
		}

		if u.Scheme == "" {
			u.Scheme = "http"
		}

		eps[i] = u.String()
	}
	return eps, nil
}

func getTransport(c *cli.Context) (*http.Transport, error) {
	tls := transport.TLSInfo{
		CAFile:   c.GlobalString("ca-file"),
		CertFile: c.GlobalString("cert-file"),
		KeyFile:  c.GlobalString("key-file"),
	}
	return transport.NewTransport(tls)

}