<?php

namespace App\Console\Commands;

use App\Models\Document;
use Carbon\Carbon;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Storage;

class PruneDocumentPreviews extends Command
{
    protected $signature = 'documents:prune-previews {--days=90 : Delete previews older than this many days} {--dry-run : Show what would be deleted without deleting}';
    protected $description = 'Deletes generated document preview files older than N days and clears their metadata.';

    public function handle(): int
    {
        $days = (int) $this->option('days');
        if ($days < 1) { $days = 90; }
        $cutoff = Carbon::now()->subDays($days);

        $previewDisk = config('files.preview_disk', 'public');
        $query = Document::query()
            ->whereNotNull('preview_path')
            ->whereNotNull('preview_generated_at')
            ->where('preview_generated_at', '<', $cutoff);

        $count = $query->count();
        if ($count === 0) {
            $this->info('No stale previews found.');
            return self::SUCCESS;
        }

        $this->info("Found {$count} previews older than {$days} days.");
        $dry = (bool) $this->option('dry-run');

        $query->chunkById(200, function ($docs) use ($previewDisk, $dry) {
            foreach ($docs as $doc) {
                $path = $doc->preview_path;
                if (!$path) { continue; }
                if ($dry) {
                    $this->line("Would delete: {$previewDisk}://{$path} (document #{$doc->id})");
                    continue;
                }
                try {
                    Storage::disk($previewDisk)->delete($path);
                } catch (\Throwable $e) {
                    // ignore errors, continue processing
                }
                $doc->preview_path = null;
                $doc->preview_mime = null;
                $doc->preview_generated_at = null;
                $doc->save();
            }
        });

        if ($dry) {
            $this->info('Dry run completed. No files were deleted.');
        } else {
            $this->info('Stale previews deleted and metadata cleared.');
        }

        return self::SUCCESS;
    }
}