/*
DESCRIPTION
  utils.go provides helper functions for functionality found in both gvctrl.go
  request.go.

AUTHORS
  Saxon A. Nelson-Milton <saxon@ausocean.org>

LICENSE
  Copyright (C) 2019 the Australian Ocean Lab (AusOcean)

  It is free software: you can redistribute it and/or modify them
  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.

  It 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
  in gpl.txt.  If not, see http://www.gnu.org/licenses.
*/

package gvctrl

import (
	"crypto/md5"
	"encoding/hex"
	"math"
	"strconv"
	"strings"
)

func md5Hex(s string) string {
	h := md5.New()
	h.Write([]byte(s))
	return strings.ToUpper(hex.EncodeToString(h.Sum(nil)))
}

func closestValIdx(v int, l []int) int {
	var idx int
	for i := range l {
		if math.Abs(float64(l[i]-v)) < math.Abs(float64(l[idx]-v)) {
			idx = i
		}
	}
	return idx
}

func closestValStr(v int, l []int) string {
	return strconv.Itoa(l[closestValIdx(v, l)] * 1000)
}