<?php

namespace App\Console\Commands;

use App\Http\Controllers\CustomFieldUploadController;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Storage;
use Lunar\Models\CartLine;
use Lunar\Models\OrderLine;

/**
 * Custom-field photos are uploaded the moment a shopper picks them (see
 * CustomFieldUploadController), before add-to-cart — so a shopper who picks a
 * photo and then leaves, or picks a different one, leaves a file nobody
 * references. This deletes those: any upload older than the grace period that
 * no cart line or order line's meta.custom_fields points to.
 *
 * The grace period covers a shopper still on the product page with a picked
 * but not-yet-added photo. A file referenced by a cart line is kept for as
 * long as that cart line exists; once the line (or its cart) is removed, the
 * next run deletes the file. Order line references are kept indefinitely.
 */
class PruneCustomFieldUploads extends Command
{
    protected $signature = 'custom-fields:prune-uploads {--hours=24 : Only delete unreferenced uploads older than this}';

    protected $description = 'Delete custom-field photo uploads not referenced by any cart or order line';

    public function handle(): int
    {
        $disk = Storage::disk(CustomFieldUploadController::DISK);
        $referenced = $this->referencedPaths();
        $cutoff = now()->subHours((int) $this->option('hours'))->getTimestamp();
        $deleted = 0;

        foreach ($disk->files(CustomFieldUploadController::DIRECTORY) as $path) {
            if (isset($referenced[$path]) || $disk->lastModified($path) > $cutoff) {
                continue;
            }

            $disk->delete($path);
            $deleted++;
        }

        $this->info("Deleted {$deleted} unreferenced custom-field upload(s).");

        return self::SUCCESS;
    }

    /**
     * @return array<string, true>
     */
    private function referencedPaths(): array
    {
        $paths = [];

        foreach ([CartLine::class, OrderLine::class] as $model) {
            $model::query()
                ->where('meta', 'like', '%custom_fields%')
                ->select('meta')
                ->cursor()
                ->each(function ($line) use (&$paths) {
                    foreach ($line->meta['custom_fields'] ?? [] as $field) {
                        if (! empty($field['path'])) {
                            $paths[$field['path']] = true;
                        }
                    }
                });
        }

        return $paths;
    }
}