<?php

declare(strict_types=1);

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

use Brain\Monkey\Filters;
use LIT\MCP\Guides\GuideRepository;
use LIT\MCP\Integrations\Core\GuideAbility;
use LIT\MCP\Tests\Unit\TestCase;
use WP_Error;

final class GuideAbilityTest extends TestCase
{
    private GuideAbility $ability;

    protected function setUp(): void
    {
        parent::setUp();
        $this->ability = new GuideAbility(new GuideRepository(dirname(__DIR__, 3) . '/Fixtures/guides'));
    }

    public function testWithoutTopicReturnsOverviewAndTopicList(): void
    {
        $result = $this->ability->execute([]);

        self::assertSame('overview', $result['topic']);
        self::assertSame(['divi-shortform', 'overview'], $result['topics']);
        self::assertStringContainsString('Testinhalt Übersicht', $result['content']);
    }

    public function testReturnsRequestedTopic(): void
    {
        $result = $this->ability->execute(['topic' => 'divi-shortform']);

        self::assertStringContainsString('Testinhalt Kurzform', $result['content']);
    }

    public function testUnknownTopicIsNotFoundErrorListingTopics(): void
    {
        $result = $this->ability->execute(['topic' => '../../wp-config']);

        self::assertInstanceOf(WP_Error::class, $result);
        self::assertToolError($result, 'not_found');
        self::assertStringContainsString('divi-shortform', $result->get_error_message());
    }

    public function testIsDirectReadOnlyTool(): void
    {
        self::assertSame('lit/guide', $this->ability->name());
        self::assertTrue($this->ability->isDirect());
        self::assertTrue($this->ability->annotations()['readonly']);
    }

    public function testAllTopicsInOneCallOverviewFirst(): void
    {
        $result = $this->ability->execute(['topic' => 'all']);

        self::assertSame('all', $result['topic']);
        self::assertSame(['divi-shortform', 'overview'], $result['topics']);
        $overview = strpos($result['content'], 'Thema `overview`');
        $shortform = strpos($result['content'], 'Thema `divi-shortform`');
        self::assertIsInt($overview);
        self::assertIsInt($shortform);
        self::assertLessThan($shortform, $overview);
        self::assertStringNotContainsString('Nicht enthalten', $result['content']);
    }

    public function testAllTopicsStopAtTheSizeLimitAndNameTheRest(): void
    {
        $big = str_repeat('x', GuideAbility::ALL_LIMIT);
        // Brain Monkey owns apply_filters(): answer the guide filter through its hooks API.
        Filters\expectApplied('lit_mcp_guides')->andReturn(['gross' => $big]);
        $ability = new GuideAbility(new GuideRepository(dirname(__DIR__, 3) . '/Fixtures/guides'));

        $content = $ability->execute(['topic' => 'all'])['content'];

        self::assertLessThanOrEqual(GuideAbility::ALL_LIMIT + 200, strlen($content));
        self::assertStringContainsString('Nicht enthalten (Größenlimit): gross', $content);
    }
}