// Mgmt
// Copyright (C) James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
// Additional permission under GNU GPL version 3 section 7
//
// If you modify this program, or any covered work, by linking or combining it
// with embedded mcl code and modules (and that the embedded mcl code and
// modules which link with this program, contain a copy of their source code in
// the authoritative form) containing parts covered by the terms of any other
// license, the licensors of this program grant you additional permission to
// convey the resulting work. Furthermore, the licensors of this program grant
// the original author, James Shubin, additional permission to update this
// additional permission if he deems it necessary to achieve the goals of this
// additional permission.

package integration

import (
	"fmt"
	"net"
	"net/url"
	"os"
	"path/filepath"
	"runtime"
	"strconv"

	"github.com/purpleidea/mgmt/util/errwrap"
)

const (
	binaryName = "mgmt"
)

// BinaryPath returns the full path to an mgmt binary. It expects that someone
// will run `make build` or something equivalent to produce a binary before this
// function runs.
func BinaryPath() (string, error) {
	_, file, _, ok := runtime.Caller(0)
	if !ok {
		return "", fmt.Errorf("can't determine binary path")
	}
	dir := filepath.Dir(file) // dir that this file is contained in
	root := filepath.Dir(dir) // we're in the parent dir to that

	return binaryPath(root, binaryName)
}

func binaryPath(root, name string) (string, error) {
	p := filepath.Join(root, name)
	fi, err := os.Stat(p)
	if err != nil {
		if os.IsNotExist(err) {
			return "", fmt.Errorf("mgmt binary is not built at `%s`; run `make build`", p)
		}
		return "", errwrap.Wrapf(err, "could not stat binary path `%s`", p)
	}
	if fi.IsDir() {
		return "", fmt.Errorf("binary path `%s` is a directory", p)
	}
	if fi.Mode()&0111 == 0 {
		return "", fmt.Errorf("binary path `%s` is not executable", p)
	}
	return p, nil
}

// ParsePort parses a URL and returns the port that was found.
func ParsePort(input string) (int, error) {
	u, err := url.Parse(input)
	if err != nil {
		return 0, errwrap.Wrapf(err, "could not parse URL")
	}
	_, sport, err := net.SplitHostPort(u.Host)
	if err != nil {
		return 0, errwrap.Wrapf(err, "could not get port")
	}
	port, err := strconv.Atoi(sport)
	if err != nil {
		return 0, errwrap.Wrapf(err, "could not parse port")
	}
	return port, nil
}
