<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Compatibility;

use LIT\MCP\Compatibility\Call;
use PHPUnit\Framework\TestCase;

final class CallTest extends TestCase
{
    public static function sample(int $a, int $b = 0): void
    {
    }

    private static function method(): string
    {
        return self::class . '::sample';
    }

    public function testAcceptsAnExistingFunctionWithAMatchingArgumentCount(): void
    {
        self::assertTrue((new Call('strlen', 1))->accepts());
        self::assertTrue((new Call('sprintf', 5))->accepts(), 'variadic');
    }

    public function testRejectsAnArgumentCountThePlatformFunctionDoesNotTake(): void
    {
        self::assertFalse((new Call('strlen', 2))->accepts(), 'strlen takes one argument');
        self::assertFalse((new Call('str_replace', 2))->accepts(), 'str_replace needs three');
    }

    public function testNullArgumentCountOnlyChecksExistence(): void
    {
        self::assertTrue((new Call('str_replace'))->accepts());
    }

    public function testMissingFunctionOrMethodIsRejected(): void
    {
        self::assertFalse((new Call('lit_mcp_missing_function'))->accepts());
        self::assertFalse((new Call(self::class . '::missing'))->accepts());
        self::assertFalse((new Call('Lit\Missing\Klass::method'))->accepts());
    }

    public function testChecksTheArgumentCountOfAMethod(): void
    {
        self::assertTrue((new Call(self::method(), 1))->accepts());
        self::assertTrue((new Call(self::method(), 2))->accepts());
        self::assertFalse((new Call(self::method(), 0))->accepts(), 'one required');
        self::assertFalse((new Call(self::method(), 3))->accepts(), 'at most two');
    }
}