<?php

declare(strict_types=1);

namespace App\Http\Requests\Api\V1;

use App\Models\FestivalSection;
use Illuminate\Foundation\Http\FormRequest;

final class ReplacePersonSectionPreferencesRequest extends FormRequest
{
    public function authorize(): bool
    {
        return true;
    }

    /** @return array<string, mixed> */
    public function rules(): array
    {
        return [
            'preferences' => ['required', 'array', 'min:1', 'max:5'],
            'preferences.*.festival_section_id' => ['required', 'ulid'],
            'preferences.*.priority' => ['required', 'integer', 'min:1', 'max:5'],
        ];
    }

    public function withValidator($validator): void
    {
        $validator->after(function ($validator) {
            $preferences = $this->input('preferences', []);

            if (!is_array($preferences)) {
                return;
            }

            // Priorities must be unique
            $priorities = array_column($preferences, 'priority');
            if (count($priorities) !== count(array_unique($priorities))) {
                $validator->errors()->add('preferences', 'Priorities must be unique within the request.');
            }

            // Validate section IDs belong to the event
            $event = $this->route('event');
            $person = $this->route('person');

            if (!$event || !$person) {
                return;
            }

            // Valid sections: own event's sections + parent festival's cross_event sections
            $validSectionIds = FestivalSection::where('event_id', $event->id)
                ->pluck('id');

            if ($event->parent_event_id) {
                $parentCrossEventSections = FestivalSection::where('event_id', $event->parent_event_id)
                    ->where('type', 'cross_event')
                    ->pluck('id');
                $validSectionIds = $validSectionIds->merge($parentCrossEventSections);
            }

            foreach ($preferences as $index => $pref) {
                $sectionId = $pref['festival_section_id'] ?? null;
                if ($sectionId && !$validSectionIds->contains($sectionId)) {
                    $validator->errors()->add(
                        "preferences.{$index}.festival_section_id",
                        'Section does not belong to this event.'
                    );
                }
            }
        });
    }
}