<?php

namespace MyProject\Tests;

use InvalidArgumentException;
use PHPUnit\Framework\TestCase;
use Symfony\Component\ObjectMapper\ObjectMapper;

final class MapMultipleTest extends TestCase
{
    public function testMapCollection(): void
    {
        $source = [
            new MyUserSource(
                firstName: 'foo',
                lastName: 'bar',
                email: 'foo@bar.com'
            ),
            new MyUserSource(
                firstName: 'abc',
                lastName: 'xyz',
                email: 'abc@xyz.com'
            ),
        ];

        $target = self::mapCollection($source, MyUserTarget::class);

        self::assertIsArray($target);
        self::assertSameObjectType($target);
        self::assertCount(2, $target);
        self::assertInstanceOf(MyUserTarget::class, $target[0]);
    }

    private static function mapCollection(array $collection, string $targetType): array
    {
        self::assertSameObjectType($collection);

        $mapper = new ObjectMapper();

        return array_map(
            static fn (object $src) => $mapper->map($src, $targetType),
            $collection
        );
    }

    /**
     * Asserts that all elements in the array are objects of the same class.
     *
     * @param object[] $objects
     * @throws InvalidArgumentException if not all objects are of the same class
     */
    private static function assertSameObjectType(array $objects): void
    {
        if (empty($objects)) {
            throw new InvalidArgumentException("Array is empty.");
        }

        $firstClass = get_class(reset($objects));

        foreach ($objects as $index => $object) {
            if (!is_object($object)) {
                throw new InvalidArgumentException(sprintf('Element at index %d is not an object.', $index));
            }

            if (get_class($object) !== $firstClass) {
                throw new InvalidArgumentException(sprintf(
                    'Type mismatch at index %d: expected instance of %s, got %s.',
                    $index,
                    $firstClass,
                    get_class($object)
                ));
            }
        }
    }
}

final readonly class MyUserSource {
    public function __construct(
        public string $firstName,
        public string $lastName,
        public string $email,
    ) {  
    }
}

final readonly class MyUserTarget {
    public function __construct(
        public string $firstName,
        public string $lastName,
        public string $email,
    ) {  
    }
}