<?php

namespace App\Jobs;

use App\Models\Territorio;
use App\Models\User;
use App\Services\TerritorioPdfImportState;
use App\Services\TerritorioThumbnailService;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class ImportTerritoryPdfFolder implements ShouldQueue
{
    use Dispatchable;
    use InteractsWithQueue;
    use Queueable;
    use SerializesModels;

    public int $tries = 1;
    public int $timeout = 0;

    public function __construct(
        public string $importId,
        public array $files,
        public int $actorId,
    ) {
    }

    public function handle(TerritorioPdfImportState $stateService, TerritorioThumbnailService $thumbnailService): void
    {
        $stateService->markRunning($this->importId);
        $stateService->appendLog($this->importId, 'Worker avviato. Inizio elaborazione dei PDF.');

        $territoriMap = [];
        foreach (Territorio::withTrashed()->get() as $territorio) {
            $territoriMap[$this->normalizeTerritoryNumber($territorio->numero)] = $territorio;
        }

        $actor = User::find($this->actorId);
        $seenNumbers = [];

        try {
            foreach ($this->files as $file) {
                $originalName = $file['original_name'] ?? 'file-sconosciuto.pdf';
                $stateService->increment($this->importId, 'processed');

                $territoryMatch = $this->resolveTerritoryFromFilename($originalName, $territoriMap);

                if ($territoryMatch === null) {
                    $stateService->increment($this->importId, 'skipped');
                    $stateService->appendLog($this->importId, '[SKIP] ' . $originalName . ' - nessun numero territorio riconosciuto nel nome file.');
                    $stateService->addIssue($this->importId, [
                        'file' => $originalName,
                        'type' => 'no-match',
                        'message' => 'Nessun numero territorio riconosciuto nel nome file.',
                    ]);
                    continue;
                }

                if (($territoryMatch['type'] ?? 'single') === 'ambiguous') {
                    $stateService->increment($this->importId, 'skipped');
                    $stateService->appendLog($this->importId, '[SKIP] ' . $originalName . ' - nome ambiguo, possibili territori: ' . implode(', ', $territoryMatch['matched_numbers']) . '.');
                    $stateService->addIssue($this->importId, [
                        'file' => $originalName,
                        'type' => 'ambiguous',
                        'message' => 'Nome ambiguo.',
                        'matched_numbers' => $territoryMatch['matched_numbers'],
                    ]);
                    continue;
                }

                $normalizedNumber = $territoryMatch['normalized_number'];
                $matchedNumber = $territoryMatch['matched_number'];
                $territorio = $territoryMatch['territorio'];

                if (isset($seenNumbers[$normalizedNumber])) {
                    $stateService->increment($this->importId, 'skipped');
                    $stateService->appendLog($this->importId, '[SKIP] ' . $originalName . ' - territorio ' . $matchedNumber . ' presente piu volte nella stessa importazione.');
                    $stateService->addIssue($this->importId, [
                        'file' => $originalName,
                        'type' => 'duplicate-in-batch',
                        'message' => 'Territorio presente piu volte nella stessa importazione.',
                        'matched_numbers' => [$matchedNumber],
                    ]);
                    continue;
                }

                $seenNumbers[$normalizedNumber] = true;

                $sourcePath = Storage::disk('local')->path($file['stored_path']);

                if (! is_file($sourcePath)) {
                    $stateService->increment($this->importId, 'errors');
                    $stateService->appendLog($this->importId, '[ERR] ' . $originalName . ' - file temporaneo non trovato.');
                    $stateService->addIssue($this->importId, [
                        'file' => $originalName,
                        'type' => 'missing-temp-file',
                        'message' => 'File temporaneo non trovato.',
                        'matched_numbers' => [$matchedNumber],
                    ]);
                    continue;
                }

                try {
                    if ($territorio->pdf_path) {
                        Storage::disk('public')->delete($territorio->pdf_path);
                    }

                    if ($territorio->thumbnail_path) {
                        $thumbnailService->delete($territorio->thumbnail_path);
                    }

                    $storedFilename = Str::slug('territorio-' . $territorio->numero) . '.pdf';
                    $publicPath = 'territori-pdf/' . $storedFilename;
                    Storage::disk('public')->put($publicPath, file_get_contents($sourcePath));
                    $thumbnailPath = $thumbnailService->generate($publicPath);

                    $territorio->update([
                        'pdf_path' => $publicPath,
                        'thumbnail_path' => $thumbnailPath,
                    ]);

                    if ($actor) {
                        activity()->causedBy($actor)
                            ->performedOn($territorio)
                            ->withProperties([
                                'numero' => $territorio->numero,
                                'pdf' => $originalName,
                                'bulk_import' => true,
                            ])
                            ->log('bulk_uploaded_pdf');
                    }

                    $stateService->increment($this->importId, 'updated');
                    $stateService->appendLog(
                        $this->importId,
                        '[OK] ' . $originalName . ' - aggiornato territorio ' . $territorio->numero . ($thumbnailPath ? ' con thumbnail generata.' : ' ma la thumbnail non e stata generata.')
                    );
                } catch (\Throwable $exception) {
                    $stateService->increment($this->importId, 'errors');
                    $stateService->appendLog($this->importId, '[ERR] ' . $originalName . ' - ' . $exception->getMessage());
                    $stateService->addIssue($this->importId, [
                        'file' => $originalName,
                        'type' => 'processing-error',
                        'message' => $exception->getMessage(),
                        'matched_numbers' => [$matchedNumber],
                    ]);
                }
            }

            $stateService->appendLog($this->importId, 'Import completato.');
            $stateService->markCompleted($this->importId);
        } catch (\Throwable $exception) {
            $stateService->increment($this->importId, 'errors');
            $stateService->appendLog($this->importId, '[ERR] Errore fatale del job: ' . $exception->getMessage());
            $stateService->markFailed($this->importId);

            throw $exception;
        } finally {
            Storage::disk('local')->deleteDirectory('bulk-territori-imports/' . $this->importId);
        }
    }

    protected function resolveTerritoryFromFilename(string $filename, array $territoriMap): ?array
    {
        if ($territoriMap === []) {
            return null;
        }

        $basename = pathinfo($filename, PATHINFO_FILENAME);
        $normalizedBasename = mb_strtoupper($basename);
        $normalizedBasename = preg_replace('/[^A-Z0-9]+/u', ' ', $normalizedBasename);
        $normalizedBasename = trim(preg_replace('/\s+/', ' ', $normalizedBasename));

        $territoryKeys = array_keys($territoriMap);
        usort($territoryKeys, function (string $left, string $right) {
            $lengthComparison = mb_strlen($right) <=> mb_strlen($left);

            if ($lengthComparison !== 0) {
                return $lengthComparison;
            }

            return strnatcasecmp($left, $right);
        });

        $matches = [];

        foreach ($territoryKeys as $normalizedNumber) {
            if (! $this->filenameContainsTerritoryNumber($normalizedBasename, $normalizedNumber)) {
                continue;
            }

            $matches[] = [
                'normalized_number' => $normalizedNumber,
                'matched_number' => $territoriMap[$normalizedNumber]->numero,
                'territorio' => $territoriMap[$normalizedNumber],
            ];
        }

        if ($matches === []) {
            return null;
        }

        if (count($matches) > 1) {
            return [
                'type' => 'ambiguous',
                'matched_numbers' => array_values(array_map(fn(array $match) => $match['matched_number'], $matches)),
            ];
        }

        return $matches[0];
    }

    protected function filenameContainsTerritoryNumber(string $normalizedBasename, string $normalizedNumber): bool
    {
        $escapedNumber = preg_quote($normalizedNumber, '/');

        if (preg_match('/^\d+$/', $normalizedNumber)) {
            $escapedNumber = '0*' . preg_quote(ltrim($normalizedNumber, '0') ?: '0', '/');
        }

        return (bool) preg_match('/(^| )' . $escapedNumber . '(?= |$)/', $normalizedBasename);
    }

    protected function normalizeTerritoryNumber(string $number): string
    {
        $normalized = preg_replace('/\s+/', ' ', trim(mb_strtoupper($number)));

        if ($normalized !== '' && preg_match('/^\d+$/', $normalized)) {
            return ltrim($normalized, '0') ?: '0';
        }

        return $normalized;
    }
}