<?php

namespace App\Http\Requests\Concerns;

use Illuminate\Validation\Validator;

trait ValidatesProposalPricing
{
    /**
     * Validation rules for an optional Pavão/Irrecusável pricing block
     * (Matrícula, Aulas, Materiais, Valor Total do Curso), nested under
     * $prefix ("pavao"/"irrecusavel"). The block itself is optional — a
     * proposal can have Pavão, Irrecusável, both, or neither yet. Sending it
     * as `null` means "this proposal doesn't have this modality" (removes an
     * existing one); sending an object requires every sub-field.
     */
    protected function proposalPricingRules(string $prefix, bool $withCondition = false): array
    {
        $rules = [
            $prefix => 'sometimes|nullable|array',

            "$prefix.registration_value"                => 'nullable|numeric|min:0',
            "$prefix.registration_included_in_course"   => "required_with:$prefix|boolean",
            "$prefix.registration_installments_allowed" => "required_with:$prefix|boolean",
            "$prefix.registration_max_installments"     => 'nullable|integer|min:1',

            "$prefix.classes_value"                => 'nullable|numeric|min:0',
            "$prefix.classes_included_in_course"   => "required_with:$prefix|boolean",
            "$prefix.classes_installments_allowed" => "required_with:$prefix|boolean",
            "$prefix.classes_max_installments"     => 'nullable|integer|min:1',
            "$prefix.classes_discount_percentage"  => 'nullable|numeric|min:0|max:100',

            "$prefix.materials"              => 'nullable|array',
            "$prefix.materials.*.product_id" => "required_with:$prefix.materials|integer|exists:products,id",
            "$prefix.materials.*.quantity"   => "required_with:$prefix.materials|integer|min:1",
            "$prefix.materials.*.price"      => "required_with:$prefix.materials|numeric|min:0",
            "$prefix.materials_included_in_course"   => "required_with:$prefix|boolean",
            "$prefix.materials_installments_allowed" => "required_with:$prefix|boolean",
            "$prefix.materials_max_installments"     => 'nullable|integer|min:1',

            "$prefix.total_value"            => 'nullable|numeric|min:0',
            "$prefix.total_max_installments" => 'nullable|integer|min:1',
        ];

        if ($withCondition) {
            $rules["$prefix.condition"] = 'nullable|string';
        }

        return $rules;
    }

    /**
     * For each pricing block actually sent (present and not null), enforce
     * that exactly one of "included in course" / "allows installments" is
     * selected per section.
     */
    protected function validateProposalPricingSections(Validator $validator, array $prefixes): void
    {
        $validator->after(function (Validator $validator) use ($prefixes) {
            foreach ($prefixes as $prefix) {
                if (!$this->has($prefix) || $this->input($prefix) === null) continue;

                foreach (['registration', 'classes', 'materials'] as $section) {
                    $includedKey     = "$prefix.{$section}_included_in_course";
                    $installmentsKey = "$prefix.{$section}_installments_allowed";

                    if (!$this->has($includedKey) && !$this->has($installmentsKey)) continue;

                    $included     = $this->boolean($includedKey);
                    $installments = $this->boolean($installmentsKey);

                    if ($included === $installments) {
                        $validator->errors()->add(
                            $includedKey,
                            'Selecione exatamente uma opção: incluso no valor do curso ou permite parcelar.'
                        );
                    }
                }
            }
        });
    }
}