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namespace Illuminate\JsonSchema;

use RuntimeException;

class Serializer
{
    /**
     * The properties to ignore when serializing.
     *
     * @var array&lt;int, string&gt;
     */
    protected static array $ignore = [&#039;required&#039;, &#039;nullable&#039;];

    /**
     * Serialize the given property to an array.
     *
     * @return array&lt;string, mixed&gt;
     */
    public static function serialize(Types\Type $type): array
    {
        /** @var array&lt;string, mixed&gt; $attributes */
        $attributes = (fn () =&gt; get_object_vars($type))-&gt;call($type);

        $attributes[&#039;type&#039;] = match (get_class($type)) {
            Types\ArrayType::class =&gt; &#039;array&#039;,
            Types\BooleanType::class =&gt; &#039;boolean&#039;,
            Types\IntegerType::class =&gt; &#039;integer&#039;,
            Types\NumberType::class =&gt; &#039;number&#039;,
            Types\ObjectType::class =&gt; &#039;object&#039;,
            Types\StringType::class =&gt; &#039;string&#039;,
            default =&gt; throw new RuntimeException(&#039;Unsupported [&#039;.get_class($type).&#039;] type.&#039;),
        };

        $nullable = static::isNullable($type);

        if ($nullable) {
            $attributes[&#039;type&#039;] = [$attributes[&#039;type&#039;], &#039;null&#039;];
        }

        $attributes = array_filter($attributes, static function (mixed $value, string $key) {
            if (in_array($key, static::$ignore, true)) {
                return false;
            }

            return $value !== null;
        }, ARRAY_FILTER_USE_BOTH);

        if ($type instanceof Types\ObjectType) {
            if (count($attributes[&#039;properties&#039;]) === 0) {
                unset($attributes[&#039;properties&#039;]);
            } else {
                $required = array_keys(array_filter(
                    $attributes[&#039;properties&#039;],
                    static fn (Types\Type $property) =&gt; static::isRequired($property),
                ));

                if (count($required) &gt; 0) {
                    $attributes[&#039;required&#039;] = $required;
                }

                $attributes[&#039;properties&#039;] = array_map(
                    static fn (Types\Type $property) =&gt; static::serialize($property),
                    $attributes[&#039;properties&#039;],
                );
            }
        }

        if ($type instanceof Types\ArrayType) {
            if (isset($attributes[&#039;items&#039;]) &amp;&amp; $attributes[&#039;items&#039;] instanceof Types\Type) {
                $attributes[&#039;items&#039;] = static::serialize($attributes[&#039;items&#039;]);
            }
        }

        return $attributes;
    }

    /**
     * Determine if the given type is required.
     */
    protected static function isRequired(Types\Type $type): bool
    {
        $attributes = (fn () =&gt; get_object_vars($type))-&gt;call($type);

        return isset($attributes[&#039;required&#039;]) &amp;&amp; $attributes[&#039;required&#039;] === true;
    }

    /**
     * Determine if the given type is nullable.
     */
    protected static function isNullable(Types\Type $type): bool
    {
        $attributes = (fn () =&gt; get_object_vars($type))-&gt;call($type);

        return isset($attributes[&#039;nullable&#039;]) &amp;&amp; $attributes[&#039;nullable&#039;] === true;
    }
}
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