<?php

declare(strict_types=1);

/*
 * Chill is a software for social workers
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace Chill\DocStoreBundle\Dav\Request;

use Chill\DocStoreBundle\Dav\Exception\ParseRequestException;

/**
 * @phpstan-type davProperties array{resourceType: bool, contentType: bool, lastModified: bool, creationDate: bool, contentLength: bool, etag: bool, supportedLock: bool, unknowns: list<array{xmlns: string, prop: string}>}
 */
class PropfindRequestAnalyzer
{
    private const KNOWN_PROPS = [
        'resourceType',
        'contentType',
        'lastModified',
        'creationDate',
        'contentLength',
        'etag',
        'supportedLock',
    ];

    /**
     * @return davProperties
     */
    public function getRequestedProperties(\DOMDocument $request): array
    {
        $propfinds = $request->getElementsByTagNameNS('DAV:', 'propfind');

        if (0 === $propfinds->count()) {
            throw new ParseRequestException('any propfind element found');
        }

        if (1 < $propfinds->count()) {
            throw new ParseRequestException('too much propfind element found');
        }

        $propfind = $propfinds->item(0);

        if (0 === $propfind->childNodes->count()) {
            throw new ParseRequestException('no element under propfind');
        }

        $unknows = [];
        $props = [];

        foreach ($propfind->childNodes->getIterator() as $prop) {
            /** @var \DOMNode $prop */
            if (XML_ELEMENT_NODE !== $prop->nodeType) {
                continue;
            }

            if ('propname' === $prop->nodeName) {
                return $this->baseProps(true);
            }

            foreach ($prop->childNodes->getIterator() as $getProp) {
                if (XML_ELEMENT_NODE !== $getProp->nodeType) {
                    continue;
                }

                if ('DAV:' !== $getProp->lookupNamespaceURI(null)) {
                    $unknows[] = ['xmlns' => $getProp->lookupNamespaceURI(null), 'prop' => $getProp->nodeName];
                    continue;
                }

                $props[] = match ($getProp->nodeName) {
                    'resourcetype' => 'resourceType',
                    'getcontenttype' => 'contentType',
                    'getlastmodified' => 'lastModified',
                    default => '',
                };
            }
        }

        $props = array_filter(array_values($props), fn (string $item) => '' !== $item);

        return [...$this->baseProps(false), ...array_combine($props, array_fill(0, count($props), true)), 'unknowns' => $unknows];
    }

    /**
     * @return davProperties
     */
    private function baseProps(bool $default = false): array
    {
        return
            [
                ...array_combine(
                    self::KNOWN_PROPS,
                    array_fill(0, count(self::KNOWN_PROPS), $default)
                ),
                'unknowns' => [],
            ];
    }
}