List

'use strict';

function List(integer, symbols) {

	var defaults = {
		integer: 0,
		symbols: 'abcdefghiklmnopqrstvxyz0123456789'.split('')
	}

	// integer which used for + - / * ++ --
	this.integer = integer || defaults.integer

	// string of chars
	this.chars   = ''

	// array of symbols
	this.symbols = symbols
			? symbols.split('')
			: defaults.symbols

	this.update()

}

List.prototype.toString = function() {

	return this.chars;

}

List.prototype.valueOf = function() {

	return this.integer;

}

List.prototype.update = function() {

	var integer = this.integer,
			notation = this.symbols.length,
			arr = [],
			val = '';

	// check for empty
	if (notation < 1)
		return console.error(`Error: { Class List }: symbols are empty: [ ${ this.symbols } ]`)


	while (integer >= 0) {

		arr.push( integer % notation )

		if (integer < notation) {
			arr.push( integer )
			break
		}

		integer = Math.floor( integer / notation )

	}

	// remove last and reverse
	arr.pop()
	arr.reverse()

	arr.forEach( (v) => val += this.symbols[v] )

	this.chars = val

}


List.prototype.set = function(int) {

	if (typeof int === 'number') {
		this.integer = int
		this.update()
	}

	return this

}

List.prototype.get = function() {

	return this.chars

}

List.prototype.inc = function() {

	this.integer++
	this.update()

	return this

}

List.prototype.dec = function() {

	this.integer = Math.max(0, this.integer - 1)
	this.update()

	return this

}

List.prototype.minus = function(int) {

	this.integer = Math.max(0, this.integer - int)
	this.update()

	return this

}

List.prototype.plus = function(int) {

	this.integer += int
	this.update()

	return this

}

List.prototype.div = function(int) {

	this.integer = Math.max( 0, Math.floor( this.integer / int ) )
	this.update()

	return this

}

List.prototype.mult = function(int) {

	this.integer *= int
	this.update()

	return this

}