<?php

class TBit {

    private $error;
    private $arrBit;
    private $strBit;
    private $length;

    public function __construct($val, $int=32) {
        if($int >= 33) {
            $this->error = new Exception("max. 32 Flags allowed");
        } else {
            $this->length = $int - 1;
            $this->setArray($val);
            $this->toBit($val);
        }
    }

    public function setArray($dec=0){
        for($i = 0; $i <= $this->length; $i++) {
            $this->strBit .= Bit::boolInt(false);
        }
        return $this;
    }

    /**
     * toBit
     * @param int $dec
     * @return void
     */
    public function toBit( $dec ) {
        $this->strBit = str_pad((string)decbin($dec),$this->length,"0",STR_PAD_LEFT);
        foreach(str_split($this->strBit, 1) as $key => $val){
            $this->arrBit[$key] = Bit::intBool($val);
        }
        return $this;
    }

    public function set($index, $value) {
        if($index >= $this->length) return false;
        if(!is_bool($value)){
            $this->error = new Exception("expecting a boolean value");
        } else {
            $this->arrBit[$index] = Bit::boolInt($value);
            $this->strBit = str_pad((string)implode("",$this->arrBit),$this->length,"0",STR_PAD_LEFT);
        }
        return $this;
    }

    public function add(array $value) {
        if(!is_bool($value)) {
            $this->error = new Exception("Expecting boolean value");
        } else {
            for($i=0; $i <= $this->length; $i++) {
                $this->arrBit[$i] = Bit::boolInt($value);
            }
            $this->strBit = str_pad((string)implode("",$this->arrBit),$this->length,"0",STR_PAD_LEFT);
        }
        return $this;
    }

    private static function boolInt($value) {
       return (int)($value==true?1:0);
    }
    
    private static function intBool($value) {
       return (bool)($value==1?true:false);
    }

    /**
     * getDecimal
     * @return int
     */
    public function get(){
        return $this->getDecimal();
    }

    public function getDecimal(){
        return bindec($this->strBit);
    }

    public function getBinary(){
        return $this->strBit;
    }

    public function getArray(){
        return $this->arrBit;
    }

    public function __toString() {
        if($this->error instanceof Exception){
            return $this->error;
        }
        return $this->getDecimal();
    }
}