<?php
namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;
use Illuminate\Support\Facades\Storage;
use Illuminate\Http\Resources\MissingValue;

class ArtworkListResource extends JsonResource
{
    /**
     * Transform the resource into an array for listings (browse feed).
     */
    public function toArray($request): array
    {
        if ($this instanceof MissingValue || $this->resource instanceof MissingValue) {
            return [];
        }
        // Safe accessor to avoid magic __get which may trigger MissingValue errors
        $get = function ($key) {
            $r = $this->resource;
            if ($r instanceof MissingValue || $r === null) {
                return null;
            }
            if (method_exists($r, 'getAttribute')) {
                return $r->getAttribute($key);
            }
            if (is_array($r)) {
                return $r[$key] ?? null;
            }
            if (is_object($r)) {
                return $r->{$key} ?? null;
            }
            return null;
        };
        $primaryCategory = $this->whenLoaded('categories', function () {
            return $this->categories->sortBy('sort_order')->first();
        });

        // Normalize MissingValue into null so later checks are straightforward
        if ($primaryCategory instanceof MissingValue) {
            $primaryCategory = null;
        }

        $contentTypeSlug = null;
        $categoryPath = null;
        if ($primaryCategory) {
            $contentTypeSlug = optional($primaryCategory->contentType)->slug ?? null;
            $categoryPath = $primaryCategory->full_slug_path ?? null;
        }
        $slugVal = $get('slug');
        $webUrl = $contentTypeSlug && $categoryPath && $slugVal
            ? '/' . strtolower($contentTypeSlug) . '/' . strtolower($categoryPath) . '/' . $slugVal
            : null;

        return [
            'slug' => $slugVal,
            'title' => $get('title'),
            'description' => $this->when($request->boolean('include_description'), fn() => $get('description')),
            'dimensions' => [
                'width' => $get('width'),
                'height' => $get('height'),
            ],
            'thumbnail_url' => $this->when(! empty($get('file_path')), fn() => Storage::url($get('file_path'))),
            'author' => $this->whenLoaded('user', function () {
                return [
                    'name' => $this->user->name ?? null,
                ];
            }),
            'category' => $primaryCategory ? [
                'slug' => $primaryCategory->slug ?? null,
                'name' => $primaryCategory->name ?? null,
                'content_type' => $contentTypeSlug,
                'url' => $webUrl,
            ] : null,
            'urls' => [
                'web' => $webUrl,
                'canonical' => $webUrl,
            ],
        ];
    }
}