<?php

namespace Modules\Accounting\Services;

use App\Transaction;
use Modules\Accounting\Utils\AccountingUtil;

class PayrollTaxBridgeService
{
    public function __construct(
        protected AccountingUtil $accountingUtil,
        protected PayrollTaxTableService $taxTableService
    ) {}

    public function isEnabled(int $businessId): bool
    {
        $settings = $this->accountingUtil->getAccountingSettings($businessId);

        return ! empty($settings['payroll_tax_auto_apply']);
    }

    public function applyToPayroll(Transaction $transaction, int $businessId): Transaction
    {
        if ($transaction->type !== 'payroll' || ! $this->isEnabled($businessId)) {
            return $transaction;
        }

        $taxableIncome = (float) ($transaction->total_before_tax ?: $transaction->final_total);
        $taxAmount = $this->taxTableService->calculateTax($businessId, $taxableIncome);

        if ($taxAmount <= 0) {
            return $transaction;
        }

        $deductions = json_decode($transaction->essentials_deductions ?? '[]', true);
        if (! is_array($deductions)) {
            $deductions = [];
        }

        $alreadyApplied = collect($deductions)->contains(function ($row) {
            return is_array($row) && ($row['name'] ?? '') === 'Income Tax (GL)';
        });

        if ($alreadyApplied) {
            return $transaction;
        }

        $deductions[] = [
            'name' => 'Income Tax (GL)',
            'amount' => $taxAmount,
            'type' => 'fixed',
            'percent' => 0,
        ];

        $transaction->essentials_deductions = json_encode($deductions);
        $transaction->final_total = max(0, (float) $transaction->final_total - $taxAmount);
        $transaction->save();

        return $transaction;
    }
}