<?php

const NEWS_PNG_DIRECTORY = __DIR__ . '/news/png';

function isValidNewsFileBase(string $fileBase): bool
{
    return preg_match('/^\d{4}-\d{2}-\d{2}-[A-Za-z0-9_-]+$/D', $fileBase) === 1;
}

function deleteNewsFiles(string $fileBase): bool
{
    if (!isValidNewsFileBase($fileBase)) {
        return false;
    }

    $success = true;

    foreach (glob(NEWS_PNG_DIRECTORY . '/' . $fileBase . '_page_*.png') ?: [] as $file) {
        if (!unlink($file)) {
            $success = false;
        }
    }

    return $success;
}

function cleanupExpiredNews(): void
{
    $today = new DateTimeImmutable('today');

    foreach (glob(NEWS_PNG_DIRECTORY . '/*_page_1.png') ?: [] as $file) {
        $fileBase = basename($file, '_page_1.png');

        if (!isValidNewsFileBase($fileBase)) {
            continue;
        }

        $dateString = substr($fileBase, 0, 10);
        $expiryDate = DateTimeImmutable::createFromFormat('!Y-m-d', $dateString);

        if (
            $expiryDate !== false &&
            $expiryDate->format('Y-m-d') === $dateString &&
            $today > $expiryDate
        ) {
            deleteNewsFiles($fileBase);
        }
    }
}