<?php

namespace App\Rules;

use App\Models\ClassPackageUnit;
use App\Models\ClassPackageUnitVariation;
use Closure;

// confere se os valores e parcelas do contrato sao compativeis com a
// proposta (variation) escolhida do pacote da unidade.

// usada no studentcontractrequest e no booted do studentcontract, para que
// nenhum fluxo grave um contrato incongruente com a proposta.

class StudentContractVariationConsistency
{
    // vinculo entre os campos do contrato e as colunas da proposta

    private const ITEMS = [
        [
            'value'          => 'tax_register',
            'installments'   => 'installments',
            'proposal_value' => 'register_value',
            'proposal_min'   => 'register_installments_min',
            'proposal_max'   => 'register_installments_max',
        ],
        [
            'value'          => 'package_value',
            'installments'   => 'package_installments',
            'proposal_value' => 'package_value',
            'proposal_min'   => 'package_installments_min',
            'proposal_max'   => 'package_installments_max',
        ],
        [
            'value'          => 'material_value',
            'installments'   => 'material_installments',
            'proposal_value' => 'material_value',
            'proposal_min'   => 'material_installments_min',
            'proposal_max'   => 'material_installments_max',
        ],
    ];

    public function __construct(
        private readonly ?Closure $packageUnitResolver = null,
    ) {}

    // retorna [campo => [mensagens]]; vazio quando esta tudo consistente.

    public function errors(array $data): array
    {
        if (empty($data['class_package_unit_id'])) {
            return [];
        }

        $packageUnit = $this->packageUnitResolver
            ? ($this->packageUnitResolver)((int) $data['class_package_unit_id'])
            : ClassPackageUnit::with('variations')->find($data['class_package_unit_id']);

        if (! $packageUnit) {
            return [];
        }

        // proposta fixa selecionada: valores e parcelas vem dela

        if (! empty($data['class_package_unit_variation_id'])) {
            $proposal = $packageUnit->variations->firstWhere('id', (int) $data['class_package_unit_variation_id']);

            if (! $proposal) {
                return ['class_package_unit_variation_id' => [__('validation.student_contract_variation_unavailable')]];
            }

            return $this->fixedProposalErrors($data, $proposal);
        }

        // sem proposta o contrato e custom: limites entre irrecusavel e pavao

        return $this->customProposalErrors(
            $data,
            $packageUnit->variations->firstWhere('type', ClassPackageUnitVariation::TYPE_PAVAO),
            $packageUnit->variations->firstWhere('type', ClassPackageUnitVariation::TYPE_IRRECUSAVEL),
        );
    }

    //

    private function fixedProposalErrors(array $data, ClassPackageUnitVariation $proposal): array
    {
        $errors = [];

        // qualquer valor diferente da proposta caracteriza custom

        foreach (self::ITEMS as $item) {
            if (round((float) ($data[$item['value']] ?? 0), 2) !== round((float) $proposal->{$item['proposal_value']}, 2)) {
                $errors[$item['value']][] = __('validation.student_contract_variation_value_mismatch');
            }

            $this->addInstallmentsError($errors, $item, $data, $proposal->{$item['proposal_min']}, $proposal->{$item['proposal_max']});
        }

        return $errors;
    }

    private function customProposalErrors(
        array $data,
        ?ClassPackageUnitVariation $pavao,
        ?ClassPackageUnitVariation $irrecusavel,
    ): array {
        // sem as duas propostas configuradas nao existem limites para conferir

        if (! $pavao || ! $irrecusavel) {
            return [];
        }

        $errors = [];

        // o montante final fica entre o total da irrecusavel e o total da pavao

        $total = round(
            (float) ($data['tax_register'] ?? 0)
            + (float) ($data['package_value'] ?? 0)
            + (float) ($data['material_value'] ?? 0),
            2,
        );

        $min = $irrecusavel->totalValue();
        $max = $pavao->totalValue();

        if ($total < $min || $total > $max) {
            $errors['package_value'][] = __('validation.student_contract_custom_total_range', [
                'min' => number_format($min, 2, ',', '.'),
                'max' => number_format($max, 2, ',', '.'),
            ]);
        }

        // as parcelas ficam entre o minimo da irrecusavel e o maximo da pavao

        foreach (self::ITEMS as $item) {
            $this->addInstallmentsError($errors, $item, $data, $irrecusavel->{$item['proposal_min']}, $pavao->{$item['proposal_max']});
        }

        return $errors;
    }

    //

    private function addInstallmentsError(array &$errors, array $item, array $data, int $min, int $max): void
    {
        $installments = $data[$item['installments']] ?? null;

        if ($installments === null) {
            return;
        }

        if ((int) $installments < $min || (int) $installments > $max) {
            $errors[$item['installments']][] = __('validation.student_contract_installments_range', [
                'min' => $min,
                'max' => $max,
            ]);
        }
    }
}