<?php

class Qs_Form_Element_Numeric extends Zend_Form_Element_Xhtml
{
    public $helper = 'formText';
    protected $_locale;
    protected $_precision;
    protected $_group;
    protected $_decimal;
    protected $_negative;

    // TODO: Currency symbol support
    // TODO: Validate element according to $_precision and $_negative

    public function init()
    {
        $this->_initDefaults();
        $this->addValidator('Float', false, ['locale' => $this->getLocale()]);

        $class = (array) $this->getAttrib('class');
        $class[] = 'autoNumeric';
        $this->setAttrib('class', $class);
    }

    protected function _initDefaults()
    {
        $_locale = 'en_US';
        $_precision = 2;
        $_group = ',';
        $_decimal = '.';
        $_negative = true;

        if (null === $this->_locale) {
            if (Zend_Registry::isRegistered('Zend_Locale')) {
                $this->_locale = Zend_Registry::get('Zend_Locale');
            } else {
                $this->_locale = $_locale;
            }
        }
        if (null === $this->_precision || null === $this->_group) {
            $_localeInfo = Zend_Locale_Data::getList($this->_locale, 'symbols');
            if (null === $this->_group) {
                $this->_group = (empty($_localeInfo['group'])) ? $_group : $_localeInfo['group'];
            }
            if (null === $this->_decimal) {
                $this->_decimal = (empty($_localeInfo['decimal'])) ? $_decimal : $_localeInfo['decimal'];
            }
        }
        if (null === $this->_precision) {
            $this->_precision = $_precision;
        }
        if (null === $this->_negative) {
            $this->_negative = $_negative;
        }

        return $this;
    }

    protected function _filterValue(&$value, &$key)
    {
        parent::_filterValue($value, $key);
        if (!empty($value)) {
            $value = (string) $value;
            $value = str_replace($this->getGroup(), '', $value);
            $value = str_replace($this->getDecimal(), '.', $value);
        }
    }

    public function getValue()
    {
        $value = parent::getValue();
        if ('' === $value) {
            $value = null;
        }
        return $value;
    }

    public function loadDefaultDecorators()
    {
        if ($this->loadDefaultDecoratorsIsDisabled()) {
            return;
        }

        $decorators = $this->getDecorators();
        if (empty($decorators)) {
            $this->addDecorator('Numeric')
                ->addDecorator('Errors')
                ->addDecorator('Description', ['tag' => 'p', 'class' => 'description'])
                ->addDecorator('HtmlTag', ['tag' => 'dd', 'id' => $this->getName() . '-element'])
                ->addDecorator('Label', ['tag' => 'dt']);
        }
    }

    public function getLocale()
    {
        return $this->_locale;
    }

    /**
     * Sets the locale
     *
     * @param string|Zend_Locale $locale
     * @return Qs_Form_Element_Numeric
     */
    public function setLocale($locale = null)
    {
        $this->_locale = Zend_Locale::findLocale($locale);
        return $this;
    }

    public function getPrecision()
    {
        return $this->_precision;
    }

    /**
     * Set precision
     * @param int $precision
     * @return Qs_Form_Element_Numeric
     */
    public function setPrecision($precision)
    {
        $this->_precision = (int) $precision;
        return $this;
    }

    /**
     * Set thousand separator
     * @param $separator
     * @return Qs_Form_Element_Numeric
     */
    public function setGroup($separator)
    {
        $this->_group = (string) $separator;
        return $this;
    }

    public function getGroup()
    {
        return $this->_group;
    }

    /**
     * Set decimal separator
     * @param string $decimalPoint
     * @return Qs_Form_Element_Numeric
     */
    public function setDecimal($decimalPoint)
    {
        $this->_decimal = (string) $decimalPoint;
        return $this;
    }

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

    /**
     * Set flag allow or disallow negative values
     * @param bool $flag
     * @return Qs_Form_Element_Numeric
     */
    public function setNegative($flag)
    {
        $this->_negative = (bool) $flag;
        return $this;
    }

    public function getNegative()
    {
        return $this->_negative;
    }

}