<?php

declare(strict_types=1);

namespace App\Tests\Unit\Mcp;

use App\Mcp\Schema\CoercingSchemaGenerator;
use App\Mcp\Tool\Task\CreateTaskTool;
use App\Mcp\Tool\Task\ListTasksTool;
use PHPUnit\Framework\TestCase;
use ReflectionMethod;

/**
 * @internal
 */
class CoercingSchemaGeneratorTest extends TestCase
{
    private CoercingSchemaGenerator $generator;

    protected function setUp(): void
    {
        $this->generator = new CoercingSchemaGenerator();
    }

    public function testNullableIntegerScalarAlsoAcceptsString(): void
    {
        $schema = $this->generator->generate(new ReflectionMethod(ListTasksTool::class, '__invoke'));

        // ?int $projectId -> ["null","integer"] relaxed with "string".
        self::assertSame(['null', 'integer', 'string'], $schema['properties']['projectId']['type']);
    }

    public function testRequiredIntegerScalarAlsoAcceptsString(): void
    {
        $schema = $this->generator->generate(new ReflectionMethod(ListTasksTool::class, '__invoke'));

        // int $limit = 100 -> "integer" relaxed to ["integer","string"].
        self::assertSame(['integer', 'string'], $schema['properties']['limit']['type']);
    }

    public function testBooleanScalarAlsoAcceptsString(): void
    {
        $schema = $this->generator->generate(new ReflectionMethod(CreateTaskTool::class, '__invoke'));

        // ?bool $syncToCalendar -> ["boolean","null"] relaxed with "string".
        $type = $schema['properties']['syncToCalendar']['type'];
        self::assertContains('boolean', $type);
        self::assertContains('string', $type);
        self::assertContains('null', $type);
    }

    public function testArrayItemTypeAlsoAcceptsString(): void
    {
        $schema = $this->generator->generate(new ReflectionMethod(CreateTaskTool::class, '__invoke'));

        // int[] $tagIds -> items {type: integer} relaxed to {type: [integer, string]}.
        self::assertSame(['integer', 'string'], $schema['properties']['tagIds']['items']['type']);
    }

    public function testStringScalarIsLeftUntouched(): void
    {
        $schema = $this->generator->generate(new ReflectionMethod(CreateTaskTool::class, '__invoke'));

        // string $title stays a plain string (no spurious relaxation).
        self::assertSame('string', $schema['properties']['title']['type']);
    }

    public function testArrayContainerTypeIsNotRelaxed(): void
    {
        $schema = $this->generator->generate(new ReflectionMethod(CreateTaskTool::class, '__invoke'));

        // The array container itself must not gain "string".
        self::assertSame(['array', 'null'], $schema['properties']['tagIds']['type']);
    }
}