<?php

namespace App\Http\Requests;

use App\Models\StudentContract;
use Carbon\CarbonImmutable;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Validator;

class StudentContractRequest extends FormRequest
{
    public function rules(): array
    {
        // aluno e pacote sao obrigatorios apenas no cadastro

        $required = $this->isMethod('POST') ? 'required' : 'sometimes';

        return [
            'student_id'             => "$required|exists:students,id",
            'protocol'               => 'sometimes|nullable|string|max:255',
            'signature_date'         => 'sometimes|nullable|date_format:Y-m-d',
            'end_date'               => 'sometimes|nullable|date_format:Y-m-d',
            'class_package_unit_id'  => "$required|exists:class_package_units,id",
            'class_quantity'         => 'sometimes|nullable|integer|min:1',
            'weekday'                => 'sometimes|nullable|integer|min:0|max:6',
            'start_time'             => 'sometimes|nullable|date_format:H:i',
            'end_time'               => 'sometimes|nullable|date_format:H:i',
            'second_weekday'         => 'sometimes|nullable|integer|min:0|max:6',
            'second_start_time'      => 'sometimes|nullable|date_format:H:i',
            'second_end_time'        => 'sometimes|nullable|date_format:H:i',
            'due_day'                => 'sometimes|nullable|integer|min:1|max:31',
            'tax_register'           => 'sometimes|nullable|numeric|min:0',
            'installments'           => 'sometimes|nullable|integer|min:1|max:12',
            'enrollment_due_date'    => 'sometimes|nullable|date_format:Y-m-d',
            'package_value'          => 'sometimes|nullable|numeric|min:0',
            'package_installments'   => 'sometimes|nullable|integer|min:1|max:13',
            'package_due_date'       => 'sometimes|nullable|date_format:Y-m-d',
            'early_payment_discount' => 'sometimes|nullable|numeric|min:0|max:100',
            'interest_rate'          => 'sometimes|nullable|numeric|min:0',
            'payment_method'         => 'sometimes|nullable|string|in:pix,credit_card,debit_card',
            'fine_cancelled'         => 'sometimes|nullable|numeric|min:0|max:100',
        ];
    }

    public function after(): array
    {
        return [
            function (Validator $validator): void {
                // o cadastro e a renovacao possuem limites de periodo diferentes

                if ($this->isMethod('POST')) {
                    $this->validateCreationPeriod($validator);

                    return;
                }

                $this->validateRenewalPeriod($validator);
            },
        ];
    }

    private function validateCreationPeriod(Validator $validator): void
    {
        // na criacao o contrato pode durar no maximo um ano desde a assinatura

        if (
            ! $this->filled(['signature_date', 'end_date'])
            || $validator->errors()->hasAny(['signature_date', 'end_date'])
        ) {
            return;
        }

        $signatureDate = CarbonImmutable::createFromFormat('!Y-m-d', $this->string('signature_date')->toString());

        $endDate = CarbonImmutable::createFromFormat('!Y-m-d', $this->string('end_date')->toString());

        if ($endDate->greaterThan($signatureDate->addYearNoOverflow())) {
            $validator->errors()->add(
                'end_date',
                __('validation.student_contract_max_duration'),
            );
        }
    }

    private function validateRenewalPeriod(Validator $validator): void
    {
        // a renovacao sempre considera os dados da versao atual do contrato

        $contract = $this->contractBeingUpdated();

        if (!$contract) {
            return;
        }

        // a data inicial fica imutavel depois que o contrato e criado

        if (
            $this->exists('signature_date')
            && !$validator->errors()->has('signature_date')
            && $this->input('signature_date') !== $contract->signature_date?->format('Y-m-d')
        ) {
            $validator->errors()->add(
                'signature_date',
                __('validation.student_contract_signature_date_immutable'),
            );
        }

        // sem uma nova data final valida nao existe periodo para conferir

        if (!$this->exists('end_date') || $validator->errors()->has('end_date')) {
            return;
        }

        $currentEndDate = $contract->end_date?->toImmutable();

        $newEndDate = $this->filled('end_date')
            ? CarbonImmutable::createFromFormat('!Y-m-d', $this->string('end_date')->toString())
            : null;

        // a data final nunca pode diminuir nem ser removida

        if ($currentEndDate && (!$newEndDate || $newEndDate->lessThan($currentEndDate))) {
            $validator->errors()->add(
                'end_date',
                __('validation.student_contract_end_date_cannot_decrease'),
            );

            return;
        }

        // reenviar a mesma data nao caracteriza uma renovacao

        if (
            (!$currentEndDate && !$newEndDate)
            || ($currentEndDate && $newEndDate && $newEndDate->equalTo($currentEndDate))
        ) {
            return;
        }

        // a renovacao pode avancar no maximo um ano a partir da data atual

        $maximumEndDate = CarbonImmutable::today()->addYearNoOverflow();

        if ($newEndDate?->greaterThan($maximumEndDate)) {
            $validator->errors()->add(
                'end_date',
                __('validation.student_contract_renewal_max_end_date', [
                    'date' => $maximumEndDate->format('d/m/Y'),
                ]),
            );
        }
    }

    protected function contractBeingUpdated(): ?StudentContract
    {
        // o id da rota identifica a versao usada como base para a edicao

        $contractId = $this->route('id');

        return is_numeric($contractId) ? StudentContract::find((int) $contractId) : null;
    }
}