<?php

declare(strict_types=1);

namespace App\Http\Resources\Api\V1;

use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;
use Illuminate\Support\Carbon;

final class TimeSlotResource extends JsonResource
{
    public function toArray(Request $request): array
    {
        return [
            'id' => $this->id,
            'event_id' => $this->event_id,
            'name' => $this->name,
            'person_type' => $this->person_type,
            'date' => $this->date->toDateString(),
            'start_time' => Carbon::parse($this->start_time)->format('H:i'),
            'end_time' => Carbon::parse($this->end_time)->format('H:i'),
            'duration_hours' => $this->duration_hours,
            'source' => $this->resource->getAttribute('source'),
            'event_name' => $this->whenLoaded('event', fn () => $this->event->name),
            'shifts_count' => $this->whenCounted('shifts'),
            // Aggregates computed from eager-loaded shifts with assignment counts.
            // For events with >200 shifts, consider replacing with a raw aggregate query.
            'total_slots' => $this->when(
                $this->relationLoaded('shifts'),
                fn () => (int) $this->shifts->sum('slots_total'),
            ),
            'filled_slots' => $this->when(
                $this->relationLoaded('shifts'),
                fn () => (int) $this->shifts->sum(fn ($shift) => $shift->assignments_count ?? 0),
            ),
            'sections_count' => $this->when(
                $this->relationLoaded('shifts'),
                fn () => $this->shifts->pluck('festival_section_id')->unique()->count(),
            ),
            'created_at' => $this->created_at->toIso8601String(),
        ];
    }
}