<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Divi\Compose;

use LIT\MCP\Tests\Support\DiviFixtures;
use LIT\MCP\Integrations\Divi\Compose\StructureRules;
use LIT\MCP\Integrations\Divi\BlockTree\Block;
use LIT\MCP\Tests\Support\ComposeFixture;
use PHPUnit\Framework\TestCase;

final class StructureRulesTest extends TestCase
{
    /** @return array<string, array{?Block, string, ?string}> Parent, child, part of the reason (null = allowed). */
    public static function placements(): array
    {
        $section = static fn (string $type): Block => Block::create(
            'divi/section',
            ['module' => ['advanced' => ['type' => ['desktop' => ['value' => $type]]]]]
        );

        return [
            'section on top' => [null, 'divi/section', null],
            'module on top' => [null, 'divi/text', 'oberster Ebene'],
            'unknown module' => [Block::create('divi/column'), 'divi/slider-pro', 'unbekanntes Modul'],
            'row in a section' => [Block::create('divi/section'), 'divi/row', null],
            'module in a section' => [Block::create('divi/section'), 'divi/text', 'Zeilen'],
            'fullwidth module in a fullwidth section' => [$section('fullwidth'), 'divi/fullwidth-header', null],
            'row in a fullwidth section' => [$section('fullwidth'), 'divi/row', 'fullwidth-Module'],
            'anything in a specialty section' => [$section('specialty'), 'divi/row', 'Spezialabschnitte'],
            'column in a row' => [Block::create('divi/row'), 'divi/column', 'Spalten entstehen mit der Zeile'],
            'module in a column' => [Block::create('divi/column'), 'divi/button', null],
            'row in a column (nestable)' => [Block::create('divi/column'), 'divi/row', null],
            'row in a group' => [Block::create('divi/group'), 'divi/row', 'passt nicht'],
            'module in a specialty column' => [
                Block::create('divi/column', ['module' => ['advanced' => ['specialtyColumns' => ['desktop' => ['value' => '2']]]]]),
                'divi/text',
                'Spezial',
            ],
            'module in a column holding inner rows' => [
                Block::create('divi/column', [], [Block::create('divi/row-inner')]),
                'divi/text',
                'Spezial',
            ],
            'group in a column' => [Block::create('divi/column'), 'divi/group', null],
            'module in a group' => [Block::create('divi/group'), 'divi/text', null],
            'fullwidth module in a column' => [Block::create('divi/column'), 'divi/fullwidth-header', 'passt nicht'],
            'child module in a column' => [Block::create('divi/column'), 'divi/accordion-item', 'passt nicht'],
            'section in a column' => [Block::create('divi/column'), 'divi/section', 'passt nicht'],
            'item in its parent' => [Block::create('divi/accordion'), 'divi/accordion-item', null],
            'other module in a parent' => [Block::create('divi/accordion'), 'divi/text', 'erlaubt nur divi/accordion-item'],
            'child in a plain module' => [Block::create('divi/text'), 'divi/button', 'keine Kind-Module'],
            'opaque parent' => [Block::parsed('divi/column', [], '<!-- wp:divi/column -->', false, true), 'divi/text', 'nur lesbar'],
            'foreign parent' => [Block::create('core/group'), 'divi/text', 'nur lesbar'],
        ];
    }

    /** @dataProvider placements */
    public function testWhatGoesWhere(?Block $parent, string $child, ?string $reason): void
    {
        $violation = ComposeFixture::rules()->violation($parent, $child);

        if ($reason === null) {
            self::assertNull($violation);
        } else {
            self::assertIsString($violation);
            self::assertStringContainsString($reason, $violation);
        }
    }

    public function testPlainModules(): void
    {
        $rules = ComposeFixture::rules();

        self::assertTrue($rules->isPlainModule('divi/button'));
        self::assertFalse($rules->isPlainModule('divi/fullwidth-header'));
        self::assertFalse($rules->isPlainModule('divi/accordion-item'));
        self::assertFalse($rules->isPlainModule('divi/row'));
    }

    /** F22: Divi renders divi/post-content only in body layouts (appearance.themeBuilderLayouts). */
    public function testModulesLimitedToThemeBuilderAreas(): void
    {
        $catalog = DiviFixtures::catalog();
        $column = Block::create('divi/column');

        self::assertNull((new StructureRules($catalog, 'body'))->violation($column, 'divi/post-content'));
        self::assertSame(
            'divi/post-content zeigt Divi im Bereich „header“ nicht (nur body)',
            (new StructureRules($catalog, 'header'))->violation($column, 'divi/post-content')
        );
        self::assertNull((new StructureRules($catalog))->violation($column, 'divi/post-content'), 'pages: Divi decides');
        self::assertNull((new StructureRules($catalog, 'footer'))->violation($column, 'divi/text'));
    }
}