<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Core;

use LIT\MCP\Integrations\Core\EnvironmentComponent;
use LIT\MCP\Integrations\Core\EnvironmentProbe;
use LIT\MCP\Tests\Unit\TestCase;

final class EnvironmentProbeTest extends TestCase
{
    private function component(string $id, array $problems = []): EnvironmentComponent
    {
        return new class ($id, $problems) implements EnvironmentComponent {
            public function __construct(private string $id, private array $problems)
            {
            }

            public function describe(): array
            {
                return [
                    'id' => $this->id,
                    'active' => true,
                    'version' => '1.2.3',
                    'problems' => $this->problems,
                    'release' => ['state' => 'released'],
                ];
            }
        };
    }

    public function testGivenComponentsComeFirstInTheOrderGivenFollowedByTheEventsCalendar(): void
    {
        $probe = new EnvironmentProbe(fn (): array => [$this->component('builder', ['Etwas fehlt']), $this->component('shop')]);

        $components = $probe->components();

        self::assertSame(['builder', 'shop', 'the-events-calendar'], array_column($components, 'id'));
        self::assertSame(['Etwas fehlt'], $components[0]['problems']);
        self::assertSame(['state' => 'released'], $components[1]['release']);
    }

    public function testComponentsMayBeGivenLazilyAndAreAskedPerCall(): void
    {
        $asked = 0;
        $probe = new EnvironmentProbe(function () use (&$asked): array {
            $asked++;

            return [$this->component('lazy')];
        });

        self::assertSame(0, $asked);
        self::assertSame(['lazy', 'the-events-calendar'], array_column($probe->components(), 'id'));
        $probe->components();
        self::assertSame(2, $asked, 'asked per call, never cached: the state may change within a request');
    }

    public function testWithoutComponentsOnlyTheEventsCalendarIsReported(): void
    {
        $components = array_column((new EnvironmentProbe())->components(), null, 'id');

        self::assertSame(['the-events-calendar'], array_keys($components));
        self::assertNull($components['the-events-calendar']['version']);
        self::assertNull($components['the-events-calendar']['release']);
    }
}