<?php

class ZipalNewbuildingsLoaderNew
{

    const SECTION_ITEM = 'item';

    private $currentPath = [];

    private function getNextSection(\XmlReader $reader)
    {
        if ($reader->nodeType == \XmlReader::END_ELEMENT) {
            $this->closeElement($reader->localName);
        }

        while ($reader->read()) {
            switch ($reader->nodeType) {

                case \XMLReader::ELEMENT:
                    $this->currentPath[] = $reader->localName;
                    if ($reader->localName === $this::SECTION_ITEM) {
                        return 1;
                    }
                    break;

                case \XMLReader::END_ELEMENT:
                    $this->closeElement($reader->localName);
                    break;

            }
        }

        return 0;
    }

    private function closeElement($elementName)
    {
        while ($this->currentPath && array_pop($this->currentPath) !== $elementName) ;
    }

    private function getItemFieldsArray(\XmlReader $reader)
    {
        $attrs = [];
        while($reader->read() && !$this->isItemEnd($reader)) {
            switch ($reader->nodeType) {
                case XMLReader::END_ELEMENT:
                    continue;
                    break;
                case XMLReader::ELEMENT:
                    $attrs[$reader->name] = $reader->isEmptyElement ? '' : $this->getItemFieldsArray($reader);

                    break;
                case XMLReader::TEXT:
                case XMLReader::CDATA:
                    return $reader->value;
            }
        }

        return $attrs;
    }

    private function isItemEnd(\XmlReader $reader) {
        return $reader->nodeType == \XmlReader::END_ELEMENT && $reader->localName === 'item';
    }

    private function getElements(\XmlReader $reader, ModelBuilder $builder)
    {
        $newElementsCount = 0;
        $count = 0;

        $model = $builder->getModel($data = $this->getItemFieldsArray($reader));
        assert('$model instanceof ImportRecord');

        $isNew = $model->getIsNewRecord();

        if ($model instanceof ZipalNewbuildingItemNew) {
            if ($model->save()) {
                if ($isNew) {
                    ++$newElementsCount;
                }
                ++$count;
            } else {
                echo 'Cannt save model!';
            }
        }

        return [$newElementsCount, $count];
    }

    public function load()
    {

        $reader = new \XmlReader();
        $reader->open('https://zipal.ru/import/buildings.xml');

        $startTime = time();

        try {
            $builder = new ZipalNewbuildingItemBuilderNew();

            while ($sectionId = $this->getNextSection($reader)) {
                if ($sectionId != 1) {
                    continue;
                }

                $this->getElements($reader, $builder);
            }
            $wastedTime = time() - $startTime;
            echo $wastedTime;
        } catch (\Exception $e) {
            var_dump($e);
        } finally {
            $reader->close();
        }
    }

}