<?php

namespace App\Http\Resources;

use App\Exceptions\RuntimeException;
use Illuminate\Database\Eloquent\Relations\Relation;
use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;

class TaskResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @return array<string, mixed>
     */
    public function toArray(Request $request): array
    {
        $resource = $this->mapResource($this->taskable_type);

        return [
            'id' => $this->id,
            'name' => $this->name,
            'taskable_type' => $this->taskable_type,
            'taskable_id' => $this->taskable_id,
            'taskable' => $resource::make($this->whenLoaded('taskable')),
            'start_at' => (int) $this->start_at?->timestamp,
            'start_format' => $this->start_at?->format('Y年m月d日'),
            'end_at' => (int) $this->end_at?->timestamp,
            'end_format' => $this->end_at?->format('Y年m月d日'),
            'created_at' => $this->created_at->timestamp,
            'created_format' => $this->created_at->format('Y-m-d'),
        ];
    }

    protected function mapResource(string $type)
    {
        $model = Relation::getMorphedModel($type);
        $class = match ($model) {
            default => 'App\\Http\\Resources\\'.class_basename($model).'Resource',
        };

        if (! class_exists($class)) {
            throw new RuntimeException('未知的 subject_type');
        }

        return $class;
    }
}