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1<?php
2
3namespace FileImporter\Data;
4
5use Wikimedia\Assert\Assert;
6
7/**
8 * @license GPL-2.0-or-later
9 * @author Addshore
10 */
11class TextRevisions {
12
13    /** @var TextRevision[] */
14    private array $textRevisions;
15    /** @var int|null */
16    private $latestKey = null;
17
18    /**
19     * @param TextRevision[] $textRevisions
20     */
21    public function __construct( array $textRevisions ) {
22        Assert::parameter( $textRevisions !== [], '$textRevisions', 'cannot be empty' );
23        Assert::parameterElementType( TextRevision::class, $textRevisions, '$textRevisions' );
24        $this->textRevisions = $textRevisions;
25    }
26
27    /**
28     * @return TextRevision[]
29     */
30    public function toArray(): array {
31        return $this->textRevisions;
32    }
33
34    /**
35     * @return TextRevision|null
36     */
37    public function getLatest() {
38        $this->latestKey ??= $this->calculateLatestKey();
39        return $this->latestKey !== null ? $this->textRevisions[$this->latestKey] : null;
40    }
41
42    private function calculateLatestKey(): ?int {
43        $latestTimestamp = 0;
44        $latestKey = null;
45        foreach ( $this->textRevisions as $key => $revision ) {
46            $timestamp = strtotime( $revision->getField( 'timestamp' ) );
47            if ( $latestTimestamp < $timestamp ) {
48                $latestTimestamp = $timestamp;
49                $latestKey = $key;
50            }
51        }
52        return $latestKey;
53    }
54
55}