<?php

namespace Epages\Modules\Google;

class XmlNode
{

    private $selectedNode = null;

    private $nodesArray = [
        'title' => [
            'representation' => '<title>#VALUE#</title>',
            'value_type' => 'string',
        ],
        'link' => [
            'representation' => '<link>#VALUE#</link>',
            'value_type' => 'url',
        ],
        'description' => [
            'representation' => '<description>#VALUE#</description>',
            'value_type' => 'text',
        ],
        'item' => [
            'representation' => '<item>#VALUE#</item>',
            'value_type' => 'string',
        ],
        'id' => [
            'representation' => '<g:id>#VALUE#</g:id>',
            'value_type' => 'int',
        ],
        'item_group_id' => [
            'representation' => '<g:item_group_id>#VALUE#</g:item_group_id>',
            'value_type' => 'int',
        ],
        'availability' => [
            'representation' => '<g:availability>#VALUE#</g:availability>',
            'value_type' => 'list',
            'values_list' => [
                'Y' => 'in stock',
                'N' => 'out of stock',
                'P' => 'preorder',
            ],
        ],
        'price' => [
            'representation' => '<g:price>#VALUE#</g:price>',
            'value_type' => 'price',
        ],
        'product_type' => [
            'representation' => '<g:product_type>#VALUE#</g:product_type>',
            'value_type' => 'string',
        ],
        'image' => [
            'representation' => '<g:image_link>#VALUE#</g:image_link>',
            'value_type' => 'url',
        ],
        'additional_image' => [
            'representation' => '<g:additional_image_link>#VALUE#</g:additional_image_link>',
            'value_type' => 'url',
        ],
        'condition' => [
            'representation' => '<g:condition>#VALUE#</g:condition>',
            'value_type' => 'list',
            'values_list' => [
                'N' => 'new',
                'U' => 'used',
                'R' => 'refurbished',
            ],
        ],
        'brand' => [
            'representation' => '<g:brand>#VALUE#</g:brand>',
            'value_type' => 'string',
        ],
        'gtin' => [
            'representation' => '<g:gtin>#VALUE#</g:gtin>',
            'value_type' => 'string',
        ],
        'color' => [
            'representation' => '<g:color>#VALUE#</g:color>',
            'value_type' => 'string',
        ],
        'gender' => [
            'representation' => '<g:gender>#VALUE#</g:gender>',
            'value_type' => 'list',
            'values_list' => [
                'M' => 'male',
                'F' => 'female',
                'U' => 'unisex',
            ],
        ],
        'material' => [
            'representation' => '<g:material>#VALUE#</g:material>',
            'value_type' => 'string',
        ],
        'weight' => [
            'representation' => '<g:shipping_weight>#VALUE#</g:shipping_weight>',
            'value_type' => 'string',
        ],
        'width' => [
            'representation' => '<g:shipping_width>#VALUE#</g:shipping_width>',
            'value_type' => 'string',
        ],
        'length' => [
            'representation' => '<g:shipping_length>#VALUE#</g:shipping_length>',
            'value_type' => 'string',
        ],
        'height' => [
            'representation' => '<g:shipping_height>#VALUE#</g:shipping_height>',
            'value_type' => 'string',
        ],
        'google_category' => [
            'representation' => '<g:google_product_category>#VALUE#</g:google_product_category>',
            'value_type' => 'int',
        ],
        'age' => [
            'representation' => '<g:age_group>#VALUE#</g:age_group>',
            'value_type' => 'list',
            'values_list' => [
                'newborn' => 'newborn',
                'infant' => 'infant',
                'toddler' => 'toddler',
                'kids' => 'kids',
                'adult' => 'adult',
            ],
        ],
    ];

    public function getNode($nodeName) {
        return ($this->setSelectedNode($nodeName)) ? $this->getCurrentNode() : false;
    }

    public function setValue($value) {

        if (!empty($value)) {
            if (!is_array($value)) {
                $value = $this->format($value);
                if ($this->validate($value)) {
                    return $this->setValueToTag($this->selectedNode, $value);
                }
            } else {
                foreach ($value as $key => $val) {
                    $val = $this->format($val);
                    if ($this->validate($val)) {
                        return $this->setValueToTag($this->selectedNode, $val);
                    }
                }
                unset($key, $val);
            }
        } else {
            return false;
        }
    }
    
    protected function format($value) {
        switch ($this->selectedNode['value_type']) {
            case 'int':
                return $this->xmlFormat(floatval($value));
                break;
            case 'string':
                return $this->xmlFormat($value);
                break;
            case 'list':
                return $this->selectedNode['values_list'][$value];
                break;
            case 'price':
                preg_match_all('#(\d{1,7}\.\d{2})+\s+([A-Z]{3})#', $value, $matches);
                return $this->xmlFormat(floatval($matches[1][0]).' '.$matches[2][0]);
                break;
            case 'url':
                return $this->xmlFormat($value);
                break;
            case 'text':
                return $this->cData(mb_substr($this->xmlFormat(strip_tags($value)), 0, 5000));
                break;
            default:
                return $value;
                break;

        }
    }

    protected function validate($value) {
        switch ($this->selectedNode['value_type']) {
            case 'int':
                return is_numeric($value);
                break;
            case 'string':
            case 'text':
                return is_string($value);
                break;
            case 'list':
                return in_array($value, $this->selectedNode['values_list']);
                break;
            case 'price':
                preg_match_all('#(\d{1,7}\.{0,1}\d{2})+\s+([A-Z]{3})#', $value, $matches);
                return is_numeric($matches[1][0]) && is_string($matches[2][0]);
                break;
            case 'url':
                return true;//filter_var($value, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED | FILTER_FLAG_HOST_REQUIRED | FILTER_FLAG_PATH_REQUIRED);
                break;
            default:
                return true;
                break;
        }
    }

    protected function xmlFormat($value) {
        $value = preg_replace('/&(?!#?[a-z0-9]+;)/', '&amp;', $value);
        return $value;
    }

    protected function cData($text) {
        $text = str_replace(
            ['<![CDATA[', ']]>'],
            ['&lt;![CDATA[', ']]&gt;'],
            $text
        );

        return '<![CDATA[' . PHP_EOL . $text . PHP_EOL . ']]>';
    }

    protected function setSelectedNode($nodeName) {
        return $this->selectedNode = (array_key_exists($nodeName, $this->nodesArray)) ? $this->nodesArray[$nodeName] : false;
    }

    protected function getCurrentNode() {
        return $this;
    }

    protected function getCurrentNodeField($field) {
        return $this->selectedNode[$field];
    }

    protected function setValueToTag($tag, $value) {
        return str_replace('#VALUE#', $value, $tag['representation']);
    }

}