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<?php
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declare(strict_types=1);
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namespace ZipStream;
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use RuntimeException;
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/**
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 * @internal
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 * TODO: Make class readonly when requiring PHP 8.2 exclusively
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 */
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class PackField
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{
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    public const MAX_V = 0xFFFFFFFF;
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    public const MAX_v = 0xFFFF;
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    public function __construct(
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        public readonly string $format,
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        public readonly int|string $value
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    ) {}
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    /**
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     * Create a format string and argument list for pack(), then call
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     * pack() and return the result.
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     */
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    public static function pack(self ...$fields): string
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    {
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        $fmt = array_reduce($fields, function (string $acc, self $field) {
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            return $acc . $field->format;
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        }, '');
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        $args = array_map(function (self $field) {
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            switch ($field->format) {
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                case 'V':
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                    if ($field->value > self::MAX_V) {
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                        throw new RuntimeException(print_r($field->value, true) . ' is larger than 32 bits');
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                    }
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                    break;
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                case 'v':
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                    if ($field->value > self::MAX_v) {
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                        throw new RuntimeException(print_r($field->value, true) . ' is larger than 16 bits');
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                    }
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                    break;
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                case 'P': break;
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                default:
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                    break;
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            }
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            return $field->value;
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        }, $fields);
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        return pack($fmt, ...$args);
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    }
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}