<?php
/**
 * The largest new upload WordPress keeps as the main picture (1.9.0, D-500 gap 12). WordPress makes a smaller copy of
 * a new upload wider or taller than 2,560 pixels, adds "-scaled" to its name and uses it on pages; the original stays in
 * the uploads folder. Settings > "Largest new upload WordPress uses on pages" chooses that size or keeps the full
 * picture, through WordPress's own filter big_image_size_threshold. Only new uploads; nothing in the library changes.
 *
 * @package AffStackDevImageManager
 */

namespace AffStackDev\ImageManager;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/** WordPress's big-upload threshold as a setting. */
final class Upload_Limit {
	/** The choices: WordPress's own value (2,560 or what another plugin sets), off (no scaled copy), or a size in pixels. */
	const CHOICES = array( 'wordpress', 'off', '1920', '2048', '3200', '3840', '5120' );

	/**
	 * The threshold for this upload.
	 *
	 * @param int|false $threshold WordPress's value so far.
	 * @return int|false
	 */
	public static function threshold( $threshold ) {
		$choice = (string) ( Settings::get()['upload_limit'] ?? '' );
		if ( 'off' === $choice ) {
			return false;
		}
		// A size in pixels; the first choice (WordPress's own value) and anything unknown leave WordPress's value.
		return ctype_digit( $choice ) && in_array( $choice, self::CHOICES, true ) ? (int) $choice : $threshold;
	}
}