<?php

class Qs_Form_Element_TimeRanges extends Zend_Form_Element_Xhtml
{
    const TIME_FORMAT = 'H:i:s';

    public $helper = 'formTimeRanges';
    protected $_isArray = true;

    public $format = 'g:i a';
    public $count = 1;
    public $required;
    public $emptyOptions;

    /**
     * Valid formats:
     * - [['g' => '', 'i' => '', 'a' => ''], ['g' => '', 'i' => '', 'a' => '']], ...] - array time pairs according to format
     * - ['H:i:s', 'H:i:s'], ...] - [StartTime, EndTime] string time pairs
     * @param mixed $value
     * @return void|Zend_Form_Element
     */
    public function setValue($value)
    {
        $this->_value = array();
        foreach ((array) $value as $row) {
            list($start, $end) = $row;
            if (is_array($start) || is_array($end)) {
                $this->_value[] = array(
                    $this->_extractTime($start),
                    $this->_extractTime($end),
                );
            } else {
                $this->_value[] = array(
                    ($dt = DateTime::createFromFormat(self::TIME_FORMAT, $start)) ? $dt->format(self::TIME_FORMAT) : null,
                    ($dt = DateTime::createFromFormat(self::TIME_FORMAT, $end)) ? $dt->format(self::TIME_FORMAT) : null,
                );
            }
        }
        return $this;
    }

    protected function _filterValue(&$value, &$key)
    {
        if (is_array($value)) {
            $value = $this->_extractTime($value);
        }
        foreach ($this->getFilters() as $filter) {
            $value = $filter->filter($value);
        }
    }

    /**
     * Converts array with time parts to string
     * @param array $time Array containing time parts according to format ['g' => '', 'i' => '', 'a' => '']
     * @return string
     */
    protected function _extractTime(array $time)
    {
        $result = '';
        $format = $this->getFormat();
        for ($i = 0, $length = strlen($format); $i < $length; ++$i) {
            $char = $format[$i];
            $code = ord($char);
            $result .= (65 <= $code && $code <= 122) ? $time[$char] : $char;
        }
        return ($dt = DateTime::createFromFormat($format, $result)) ? $dt->format(self::TIME_FORMAT) : null;
    }

    public function loadDefaultDecorators()
    {
        if (!$this->loadDefaultDecoratorsIsDisabled()) {
            parent::loadDefaultDecorators();
            $this->addDecorator('TimeRanges');
        }
        return $this;
    }

    public function setRequired($flag = true)
    {
        $this->_required = (bool) $flag;
        $this->required = $this->_required;
        return $this;
    }

    public function setFormat($format)
    {
        $this->format = $format;
        return $this;
    }

    public function getFormat()
    {
        return $this->format;
    }

    public function setCount($count)
    {
        $this->count = abs((int) $count);
        return $this;
    }

    public function getCount()
    {
        return $this->count;
    }

}