<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class DoublerRequestsStoreRequest extends FormRequest
{
    public function rules(): array
    {
        return [
            'doubler_requests' => ['required', 'array'],

            // Validate event IDs (first keys)
            'doubler_requests.*' => ['required', 'array'],

            // Validate student IDs (second keys) and their values
            'doubler_requests.*.*' => [
                'nullable',
                'string',
                'max:50',
                // Custom validation rule to check if the student ID exists in DB
                function ($attribute, $value, $fail) {
                    // $attribute will be like "doubler_requests.1.107"
                    // Extract event_id and student_id from attribute
                    preg_match('/doubler_requests\.(\d+)\.(\d+)/', $attribute, $matches);
                    if (! $matches) {
                        $fail('Invalid attribute format.');

                        return;
                    }
                    $eventId = $matches[1];
                    $studentId = $matches[2];

                    // Check event ID exists
                    if (! \App\Models\Event::where('id', $eventId)->exists()) {
                        $fail("Event ID {$eventId} does not exist.");

                        return;
                    }

                    // Check student ID exists
                    if (! \App\Models\Student::where('id', $studentId)->exists()) {
                        $fail("Student ID {$studentId} does not exist.");

                        return;
                    }
                },
            ],
        ];
    }

    public function getDoublerRequests(): array
    {
        $validated = $this->validated()['doubler_requests'] ?? [];
        $result = [];

        foreach ($validated as $eventId => $students) {
            foreach ($students as $studentId => $request) {
                $result[] = [
                    'event_id' => (int) $eventId,
                    'student_id' => (int) $studentId,
                    'request' => $request,
                ];
            }
        }

        return $result;
    }

    public function authorize(): bool
    {
        return true;
    }
}