<?php

use Qs\Form\Decorator\DecorationTrait;
use Qs\Form\ResourceTrait;

/**
 * @method Qs_Form_Element_Date getElement()
 */
class Qs_Form_Decorator_JQuery_Datepicker extends Zend_Form_Decorator_HtmlTag
{
    use DecorationTrait;
    use ResourceTrait;

    protected $_placement = 'APPEND';
    protected $_options;
    private $_allowedOptions = [
        'altField',
        'altFormat',
        'appendText',
        'buttonImage',
        'buttonImageOnly',
        'buttonText',
        'changeMonth',
        'changeYear',
        'closeText',
        'constrainInput',
        'currentText',
        'dateFormat',
        'dayNames',
        'dayNamesMin',
        'dayNamesShort',
        'defaultDate',
        'duration',
        'firstDay',
        'gotoCurrent',
        'hideIfNoPrevNext',
        'isRTL',
        'maxDate',
        'minDate',
        'monthNames',
        'monthNamesShort',
        'navigationAsDateFormat',
        'nextText',
        'numberOfMonths',
        'prevText',
        'shortYearCutoff',
        'showAnim',
        'showButtonPanel',
        'showCurrentAtPos',
        'showMonthAfterYear',
        'showOn',
        'showOptions',
        'showOtherMonths',
        'stepMonths',
        'yearRange',
    ];

    public function __construct($options = null)
    {
        parent::__construct($options);
        $this->addScript('js/jquery-ui.js');
        $this->addScript('js/lib/form/element/date.js');
        $this->addStylesheet('css/thirdpart/jquery-ui.css');
    }

    public function getOptions()
    {
        if (null === $this->_options) {
            $this->_options = Qs_Array::exclude($this->getElement()->getAttribs(), 'helper', 'options');
        }
        return $this->_options;
    }

    public function setOptions(array $options)
    {
        if (isset($options['options'])) {
            unset($options['options']);
        }
        foreach ($options as $key => $value) {
            $method = 'set' . ucfirst($key);
            if (method_exists($this, $method)) {
                $this->$method($value);
            } else {
                $this->_options[$key] = $value;
            }
        }
        return $this;
    }

    public function getDisplayId()
    {
        $id = $this->getElement()->getId();
        if (false !== strpos($this->getElement()->getFullyQualifiedName(), '[')) {
            $name = $this->getElement()->getName();
            if ('[]' == substr($name, -2)) {
                $name = substr($name, 0, strlen($name) - 2);
            }
            $pos = strrpos($id, $name);
            $id = substr($id, 0, $pos) . '_' . substr($id, $pos);
        } else {
            $id = '_' . $id;
        }
        return $id;
    }

    public function getDisplayName()
    {
        $name = $this->getElement()->getFullyQualifiedName();
        if (false !== ($pos = strrpos($name, '['))) {
            $pos++;
            $name = substr($name, 0, $pos) . '_' . substr($name, $pos);
        } else {
            $name = '_' . $name;
        }
        return $name;
    }

    public function render($content)
    {
        $this->_initScripts();
        // init options
        $this->getOptions();

        $element = $this->getElement();

        /** @var Qs_View $view */
        $view = $element->getView();

        $placement = $this->getPlacement();
        $separator = $this->getSeparator();

        $name = $element->getFullyQualifiedName();
        $id = $element->getId();
        $elementContent = $view->formHidden($name, $element->getValue(), ['id' => $id]);

        $_name = $this->getDisplayName();
        $_id = $this->getDisplayId();
        $attribs = Qs_Array::excludeKey($element->getAttribs(), $this->_allowedOptions);
        $attribs['id'] = $_id;

        $elementContent .= $view->formText($_name, '', $attribs);

        switch ($placement) {
            case self::APPEND:
                $content = $content . $separator
                    . $this->getHtmlBeforeElement() . $elementContent . $this->getHtmlAfterElement();
                break;
            case self::PREPEND:
                $content = $this->getHtmlBeforeElement() . $elementContent . $this->getHtmlAfterElement()
                    . $separator . $content;
                break;
        }

        return $content;
    }

    protected function _renderScriptOptions()
    {
        $options = $this->_getScriptOptions();
        return json_encode($options);
    }

    protected function _getScriptOptions()
    {
        $options = [
            'altField'        => '#' . $this->getElement()->getId(),
            'altFormat'       => 'yy-mm-dd',
            'dateFormat'      => $this->getElement()->getFormat(),
            'duration'        => 0,
            'changeMonth'     => true,
            'changeYear'      => true,
            'showOn'          => 'button',
            'buttonImage'     => 'images/calendar.svg',
            'buttonText'      => 'Click to open/close Calendar',
            'buttonImageOnly' => true,
        ];

        foreach ($this->getOptions() as $name => $value) {
            if (false !== array_search($name, $this->_allowedOptions)) {
                $options[$name] = $value;
            }
        }

        return $options;
    }

    private function _initScripts()
    {
        /** @var $doc Qs_Doc */
        $doc = Zend_Registry::get('doc');
        $doc->addResources($this->getResources());
        $id = $this->getElement()->getId();
        $displayId = $this->getDisplayId();
        $options = $this->_getScriptOptions();
        $doc->addInitObject('lib.form.element.Date', [$id, $displayId, $options]);
        return $this;
    }
}