<?php

declare(strict_types=1);

namespace MeshVault\Tests\Integration;

use DomainException;
use MeshVault\Indexer\Contracts\FileEnumeratorInterface;
use MeshVault\Indexer\ImportException;
use MeshVault\Indexer\ImportService;
use MeshVault\Indexer\LegacyGuessedImportGroupingAdapter;
use MeshVault\Indexer\ScannedFile;
use MeshVault\Indexer\ScanResult;
use MeshVault\Indexer\SpaceChecker;
use MeshVault\Repository\PdoCatalogRepository;
use MeshVault\Repository\PdoImportJobRepository;
use PDO;
use PHPUnit\Framework\TestCase;
use RuntimeException;

final class LegacyGroupingAdapterTest extends TestCase
{
    private PDO $pdo;
    private string $database;
    private string $library;
    private string $source;
    private PdoCatalogRepository $catalog;
    private PdoImportJobRepository $jobs;
    private LegacyGuessedImportGroupingAdapter $adapter;

    protected function setUp(): void
    {
        $this->database = tempnam(sys_get_temp_dir(), 'meshvault-grouping-');
        $this->pdo = RepositoryDatabase::migrate($this->database);
        $this->catalog = new PdoCatalogRepository($this->pdo);
        $this->jobs = new PdoImportJobRepository($this->pdo);
        $this->adapter = new LegacyGuessedImportGroupingAdapter($this->catalog);
        $this->library = RepositoryDatabase::directory('library');
        $this->source = RepositoryDatabase::directory('source');
    }

    protected function tearDown(): void
    {
        unset($this->adapter, $this->catalog, $this->jobs, $this->pdo);
        RepositoryDatabase::cleanup($this->database);
        RepositoryDatabase::remove($this->library);
        RepositoryDatabase::remove($this->source);
    }

    public function testSameAdapterResolvesPersistedModelAfterRollback(): void
    {
        $file = $this->file('planes/wing.stl');
        $before = $this->snapshot();
        $failure = new RuntimeException('Force rollback after grouping.');
        try {
            $this->jobs->atomic(function () use ($file, $failure): void {
                $id = $this->adapter->modelFor($this->source, $file);
                self::assertSame($id, (int) $this->pdo->query('SELECT id FROM models')->fetchColumn());
                throw $failure;
            });
            self::fail('The transaction must roll back.');
        } catch (RuntimeException $error) {
            self::assertSame($failure, $error);
        }
        self::assertSame($before, $this->snapshot());

        // SQLite can reuse rolled-back IDs: require an actual persisted row, not a different ID.
        $id = $this->adapter->modelFor($this->source, $file);
        $rows = $this->pdo->query(
            'SELECT m.id, m.name, f.path FROM models m JOIN folders f ON f.id = m.folder_id'
        )->fetchAll(PDO::FETCH_ASSOC);
        self::assertCount(1, $rows);
        self::assertSame($id, (int) $rows[0]['id']);
        self::assertSame('planes', $rows[0]['name']);
        self::assertSame('/planes', $rows[0]['path']);
        self::assertSame($id, $this->adapter->modelFor($this->source, $file));
    }

    public function testSameAdapterRejectsAmbiguityIntroducedBetweenCalls(): void
    {
        $file = $this->file('planes/wing.stl');
        $first = $this->adapter->modelFor($this->source, $file);
        $second = $this->catalog->createModel('/planes', 'planes');
        self::assertNotSame($first, $second);
        $before = $this->snapshot();

        try {
            $this->adapter->modelFor($this->source, $file);
            self::fail('A previously resolved title must not hide new ambiguity.');
        } catch (DomainException $error) {
            self::assertSame('Ambiguous model title in home folder.', $error->getMessage());
        }
        self::assertSame($before, $this->snapshot());
    }

    public function testRepeatedImportsReuseModelsWithTheSameServiceAndAdapter(): void
    {
        $service = $this->service([$this->file('planes/wing.stl'), $this->file('planes/nested/body.stl')]);
        $first = $service->import($this->source);
        $before = $this->snapshot();
        $second = $service->import($this->source);

        self::assertNotSame($first, $second);
        $firstItems = $this->jobs->items($first);
        $secondItems = $this->jobs->items($second);
        self::assertCount(2, $firstItems);
        self::assertCount(2, $secondItems);
        $model = (int) $firstItems[0]['model_id'];
        self::assertGreaterThan(0, $model);
        foreach (array_merge($firstItems, $secondItems) as $item) {
            self::assertSame($model, (int) $item['model_id']);
            self::assertSame('Pending', $item['status']);
        }
        $after = $this->snapshot();
        self::assertSame($before['models'], $after['models']);
        self::assertSame($before['folders'], $after['folders']);
        self::assertCount(1, $after['models']);
        self::assertCount(2, $after['import_jobs']);
        self::assertCount(4, $after['import_items']);
    }


    public function testAmbiguityBetweenImportsRollsBackEarlierManifestModelCreation(): void
    {
        $plane = $this->file('planes/wing.stl');
        $service = $this->service([$plane], [$this->file('new-group/part.stl'), $plane]);
        $firstJob = $service->import($this->source);
        $firstModel = (int) $this->jobs->items($firstJob)[0]['model_id'];
        $duplicate = $this->catalog->createModel('/planes', 'planes');
        self::assertNotSame($firstModel, $duplicate);
        $before = $this->snapshot();

        try {
            // The ordered scan creates /new-group before encountering the now-ambiguous title.
            $service->import($this->source);
            self::fail('An ambiguous title must reject the entire import.');
        } catch (ImportException $error) {
            self::assertSame('DB_ERROR', $error->reason);
            self::assertInstanceOf(DomainException::class, $error->getPrevious());
            self::assertSame('Ambiguous model title in home folder.', $error->getPrevious()->getMessage());
        }

        self::assertFalse($this->pdo->inTransaction());
        self::assertSame($before, $this->snapshot(), 'No model, folder, job or item may survive the failed import.');
        self::assertSame(0, (int) $this->pdo->query(
            "SELECT COUNT(*) FROM folders WHERE path = '/new-group'"
        )->fetchColumn());
    }

    private function file(string $relative): ScannedFile
    {
        return new ScannedFile($this->source . '/' . $relative, $relative, 12, 'model/stl');
    }

    /** @param list<ScannedFile> $files @param list<ScannedFile>|null $nextFiles */
    private function service(array $files, ?array $nextFiles = null): ImportService
    {
        // Control scan order so creation precedes ambiguity. Grouping and persistence remain real.
        $enumerator = new class ($files, $nextFiles) implements FileEnumeratorInterface {
            public function __construct(private array $files, private ?array $nextFiles)
            {
            }

            public function enumerate(string $sourceRoot, array $extensions = self::DEFAULT_EXTENSIONS): ScanResult
            {
                $files = $this->files;
                $this->files = $this->nextFiles ?? $files;
                $bytes = array_sum(array_map(static fn (ScannedFile $file): int => $file->size, $files));
                return new ScanResult($files, $bytes, []);
            }
        };

        return new ImportService(
            $enumerator,
            $this->jobs,
            $this->adapter,
            new SpaceChecker(0.05, static fn (string $path): float => 1000000.0),
            $this->library,
        );
    }

    /** @return array<string, list<array<string, mixed>>> */
    private function snapshot(): array
    {
        $snapshot = [];
        foreach (['folders', 'models', 'import_jobs', 'import_items'] as $table) {
            $snapshot[$table] = $this->pdo->query('SELECT * FROM ' . $table . ' ORDER BY id')
                ->fetchAll(PDO::FETCH_ASSOC);
        }
        return $snapshot;
    }
}