/**
= Creative Commons Lizenzvertrag =
ebktools von der archium GmbH, Gera ist lizenziert unter einer Creative Commons Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International Lizenz. (http://creativecommons.org/licenses/by-nc-nd/4.0/deed.de)
Individuelle über diese Lizenz hinausgehende Berechtigungen können Sie unter https://archium.org erhalten.

= Creative Commons License =
ebktools by archium GmbH, Gera is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Individual permissions beyond the scope of this license may be available at https://archium.org.
**/
package ebkTools

import (
	"math"
	"strconv"
)

// ShortenString() shortens String in them MIDDLE and inserts a surrogate. It ist possible to prevent shortening, if maximum stringlength is inside a tolerance space
// 	fmt.Println(shortenString("abcdefghi",6,2,"[…]")) //a[…]hi
func ShortenString(input string, lengthmax, tolerance int, surrogate string) (output string) {
	if len(input) > int(lengthmax+tolerance) && lengthmax != 0 {
		if len(surrogate) == 0 {
			surrogate = "[…]" //Set Default
		}

		charstodelete := (float64(lengthmax) / 2) - (float64(len(surrogate)) / 2)
		front := input[0 : int(math.Floor(charstodelete))+1]
		rear := input[len(input)-int(math.Ceil(charstodelete))-1:]
		output = front + surrogate + rear
	} else {
		output = input
	}

	return
}

// Atoi() without Error, returning integer only
func Atoi(s string) int {
	i, err := strconv.Atoi(s)
	if err != nil {
		panic(err)
	}
	return i
}