<?php

namespace Tests\Unit;

use App\Services\LlmJsonDecoder;
use PHPUnit\Framework\TestCase;

class LlmJsonDecoderTest extends TestCase
{
    public function test_it_decodes_plain_json(): void
    {
        $decoder = new LlmJsonDecoder;
        $decoded = $decoder->decode('{"a":1}');

        $this->assertSame(['a' => 1], $decoded);
    }

    public function test_it_decodes_fenced_json(): void
    {
        $decoder = new LlmJsonDecoder;
        $decoded = $decoder->decode("```json\n{\"a\":2}\n```");

        $this->assertSame(['a' => 2], $decoded);
    }

    public function test_it_extracts_json_from_mixed_text(): void
    {
        $decoder = new LlmJsonDecoder;
        $decoded = $decoder->decode("noise before {\"a\":3} noise after");

        $this->assertSame(['a' => 3], $decoded);
    }

    public function test_it_returns_null_on_invalid_json(): void
    {
        $decoder = new LlmJsonDecoder;

        $this->assertNull($decoder->decode('no json here'));
    }
}