<?php

declare(strict_types=1);

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

use LIT\MCP\Integrations\Divi\BlockTree\Block;
use LIT\MCP\Integrations\Divi\BlockTree\Document;
use LIT\MCP\Integrations\Divi\BlockTree\GlobalInstance;
use LIT\MCP\Integrations\Divi\BlockTree\NodeIndex;
use LIT\MCP\Integrations\Divi\BlockTree\Parser;
use LIT\MCP\Integrations\Divi\BlockTree\Serializer;
use LIT\MCP\Integrations\Divi\Design\NodeRewrite;
use LIT\MCP\Integrations\Divi\Design\TreeRewrite;
use LIT\MCP\Integrations\Divi\Design\VariableDetachRewrite;
use LIT\MCP\Tests\Unit\TestCase;

final class TreeRewriteTest extends TestCase
{
    private static function document(string $inner): Document
    {
        return (new Parser())->parse(
            '<!-- wp:divi/section --><!-- wp:divi/row --><!-- wp:divi/column -->' . $inner
            . '<!-- /wp:divi/column --><!-- /wp:divi/row --><!-- /wp:divi/section -->'
        );
    }

    /** Marks every divi/button; refuses opaque blocks, like the real strategies must never be offered one. */
    private static function touchButtons(): NodeRewrite
    {
        return new class implements NodeRewrite {
            public function rewrite(Block $block): ?array
            {
                if ($block->isOpaque()) {
                    throw new \LogicException('An opaque block was offered to rewrite().');
                }

                return $block->name() === 'divi/button' ? $block->attrs() + ['touched' => true] : null;
            }

            public function notes(Block $block, string $nodeId): array
            {
                return ['Hinweis ' . $nodeId];
            }

            public function concernsInstance(Block $instance): bool
            {
                return GlobalInstance::effectiveName($instance) === 'divi/button';
            }
        };
    }

    public function testChangesBlocksAndReportsThem(): void
    {
        $document = self::document(
            '<!-- wp:divi/button {"module":{"meta":{"adminLabel":{"desktop":{"value":"Kaufen"}}}}} /-->'
            . '<!-- wp:divi/text /--><!-- wp:divi/button /-->'
        );

        $result = (new TreeRewrite(self::touchButtons()))->apply(NodeIndex::build($document));

        self::assertSame([
            ['id' => 's0.r0.c0.m0', 'module' => 'divi/button', 'label' => 'Kaufen'],
            ['id' => 's0.r0.c0.m2', 'module' => 'divi/button', 'label' => ''],
        ], $result['changed']);
        self::assertSame(['Hinweis s0.r0.c0.m0', 'Hinweis s0.r0.c0.m2'], $result['warnings']);
        self::assertSame([], $result['skipped']);
        self::assertSame(2, substr_count(Serializer::document($document), '"touched":true'));
    }

    public function testNothingToDoChangesNothing(): void
    {
        $document = self::document('<!-- wp:divi/text {"a":1} /-->');
        $before = Serializer::document($document);

        $result = (new TreeRewrite(self::touchButtons()))->apply(NodeIndex::build($document));

        self::assertSame(['changed' => [], 'warnings' => [], 'skipped' => []], $result);
        self::assertSame($before, Serializer::document($document));
    }

    public function testGlobalInstancesAreSkippedWithTheLibraryEntry(): void
    {
        $document = self::document(
            '<!-- wp:divi/global-layout {"globalModule":"1058","blockName":"divi/button"} /-->'
            . '<!-- wp:divi/global-layout {"globalModule":"1059","blockName":"divi/text"} /-->'
        );
        $before = Serializer::document($document);

        $result = (new TreeRewrite(self::touchButtons(), true))->apply(NodeIndex::build($document));

        self::assertSame([], $result['changed']);
        self::assertSame(
            [['id' => 's0.r0.c0.g0', 'reason' => 'globales Modul – im Bibliothekseintrag 1058 ändern']],
            $result['skipped']
        );
        self::assertSame($before, Serializer::document($document), 'instances are never rewritten');
    }

    /** Ruling P13, fail closed: without $revealLibraryIds the reason names no library ID. */
    public function testGlobalInstanceReasonHidesTheLibraryIdByDefault(): void
    {
        $document = self::document(
            '<!-- wp:divi/global-layout {"globalModule":"1058","blockName":"divi/button"} /-->'
        );

        $result = (new TreeRewrite(self::touchButtons()))->apply(NodeIndex::build($document));

        self::assertSame(
            [['id' => 's0.r0.c0.g0', 'reason' => 'globales Modul – im Divi-Builder ändern']],
            $result['skipped']
        );
    }

    public function testBlocksWithUnreadableAttributesAreSkippedToo(): void
    {
        $document = self::document('<!-- wp:divi/button {"a":1,} /-->');

        $result = (new TreeRewrite(self::touchButtons()))->apply(NodeIndex::build($document));

        self::assertSame(
            [['id' => 's0.r0.c0.m0', 'reason' => 'Attribute nicht lesbar – im Divi-Builder prüfen']],
            $result['skipped']
        );
    }

    public function testAGlobalLayoutWithoutLibraryEntryHasItsOwnReason(): void
    {
        $document = self::document('<!-- wp:divi/global-layout {"blockName":"divi/button"} /-->');

        $result = (new TreeRewrite(self::touchButtons()))->apply(NodeIndex::build($document));

        self::assertSame(
            [['id' => 's0.r0.c0.g0', 'reason' => 'globales Modul ohne Bibliothekseintrag – im Divi-Builder prüfen']],
            $result['skipped']
        );
    }

    public function testAReportsLeftoversStrategyListsUnchangedBlocksAsSkipped(): void
    {
        $embedded = 'Ab ' . VariableDetachRewriteTest::ref('gvid-radius0001') . ' Rundung';
        $text = static fn (string $value): string => '<!-- wp:divi/text ' . \LIT\MCP\Integrations\Divi\BlockTree\Json::encode(
            ['content' => ['innerContent' => ['desktop' => ['value' => $value]]]]
        ) . ' /-->';
        $document = self::document(
            $text($embedded) . $text(VariableDetachRewriteTest::ref('gvid-radius0001')) . '<!-- wp:divi/text /-->'
        );

        $result = (new TreeRewrite(new VariableDetachRewrite('gvid-radius0001', '8px', 'numbers')))
            ->apply(NodeIndex::build($document));

        self::assertSame(['s0.r0.c0.m1'], array_column($result['changed'], 'id'));
        self::assertSame(['s0.r0.c0.m0'], array_column($result['skipped'], 'id'), 'embedded only: reported');
        self::assertSame([], $result['warnings']);
    }
}