<?php

namespace PSX\Schema;

use PSX\Schema\Exception\InvalidSchemaException;
use PSX\Schema\Type\AnyType;
use PSX\Schema\Type\BooleanType;
use PSX\Schema\Type\GenericType;
use PSX\Schema\Type\IntersectionType;
use PSX\Schema\Type\NumberType;
use PSX\Schema\Type\ReferenceType;
use PSX\Schema\Type\StringType;
use PSX\Schema\Type\StructType;
use PSX\Schema\Type\UnionType;

/**
 * TypeAssert
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class TypeAssert
{
    /**
     * @param TypeInterface $type
     * @see https://typeschema.org/specification#Properties
     * @throws InvalidSchemaException
     */
    public static function assertProperty(TypeInterface $type)
    {
        if ($type instanceof StructType) {
            throw new InvalidSchemaException('Property must not contain a nested struct, got ' . get_class($type));
        }
    }

    /**
     * @param TypeInterface $type
     * @see https://typeschema.org/specification#ArrayProperties
     * @throws InvalidSchemaException
     */
    public static function assertItem(TypeInterface $type)
    {
        if (!($type instanceof BooleanType
            || $type instanceof NumberType
            || $type instanceof StringType
            || $type instanceof IntersectionType
            || $type instanceof UnionType
            || $type instanceof ReferenceType
            || $type instanceof GenericType
            || $type instanceof AnyType)) {
            throw new InvalidSchemaException('Item must be of type boolean, number, string, intersection, union, reference, generic or any type, got ' . get_class($type));
        }
    }

    /**
     * @param array $items
     * @see https://typeschema.org/specification#AllOfProperties
     * @throws InvalidSchemaException
     */
    public static function assertIntersection(array $items)
    {
        foreach ($items as $index => $item) {
            if (!($item instanceof ReferenceType)) {
                throw new InvalidSchemaException('All of item must be of type reference, at index ' . $index . ' we got ' . get_class($item));
            }
        }
    }

    /**
     * @param array $items
     * @see https://typeschema.org/specification#OneOfProperties
     * @throws InvalidSchemaException
     */
    public static function assertUnion(array $items)
    {
        foreach ($items as $index => $item) {
            if (!($item instanceof NumberType
                || $item instanceof StringType
                || $item instanceof BooleanType
                || $item instanceof ReferenceType)) {
                throw new InvalidSchemaException('One of item must be of type string, number, boolean or reference, at index ' . $index . ' we got ' . get_class($item));
            }
        }
    }
}
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