<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Support;

use LIT\MCP\Abilities\Errors;
use LIT\MCP\Tests\Unit\TestCase;
use PHPUnit\Framework\AssertionFailedError;
use WP_Error;

final class AssertsToolErrorsTest extends TestCase
{
    public function testReturnsTheClientPayloadOfAMatchingError(): void
    {
        $payload = self::assertToolError(Errors::invalidInput('Titel fehlt.', ['title' => 'Pflichtfeld']), 'validation_failed');

        self::assertSame('Titel fehlt.', $payload['message']);
        self::assertSame(['title' => 'Pflichtfeld'], self::errorFields(Errors::invalidInput('x', ['title' => 'Pflichtfeld'])));
    }

    /** @return array<string, array{callable(): mixed}> Built in the test: Errors needs the stubs of setUp(). */
    public static function notTheError(): array
    {
        return [
            'another code' => [static fn () => Errors::notFound('weg')],
            'no JSON payload' => [static fn () => new WP_Error('lit_validation_failed', 'kein JSON')],
            'no error at all' => [static fn () => ['ok' => true]],
        ];
    }

    /** @dataProvider notTheError */
    public function testFailsForAnythingElse(callable $result): void
    {
        $this->expectException(AssertionFailedError::class);
        self::assertToolError($result(), 'validation_failed');
    }

    public function testErrorFieldsFailsWithoutFields(): void
    {
        $this->expectException(AssertionFailedError::class);
        self::errorFields(Errors::invalidInput('x'));
    }
}