Add observers for amounts.

app/Handlers/Observer/BudgetLimitObserver.php

@@ -0,0 +1,56 @@
+<?php
+/*
+ * BudgetLimitObserver.php
+ * Copyright (c) 2024 james@firefly-iii.org.
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see https://www.gnu.org/licenses/.
+ */
+
+declare(strict_types=1);
+
+namespace FireflyIII\Handlers\Observer;
+
+use FireflyIII\Models\BudgetLimit;
+use FireflyIII\Support\Http\Api\ExchangeRateConverter;
+use Illuminate\Support\Facades\Log;
+
+class BudgetLimitObserver
+{
+    public function updated(BudgetLimit $budgetLimit): void
+    {
+        Log::debug('Observe "updated" of a budget limit.');
+        $this->updateNativeAmount($budgetLimit);
+    }
+
+    public function created(BudgetLimit $budgetLimit): void
+    {
+        Log::debug('Observe "created" of a budget limit.');
+        $this->updateNativeAmount($budgetLimit);
+    }
+
+    private function updateNativeAmount(BudgetLimit $budgetLimit): void
+    {
+        $userCurrency = app('amount')->getDefaultCurrencyByUserGroup($budgetLimit->budget->user->userGroup);
+        $budgetLimit->native_amount = null;
+        if ($budgetLimit->transactionCurrency->id !== $userCurrency->id) {
+            $converter = new ExchangeRateConverter();
+            $converter->setIgnoreSettings(true);
+            $budgetLimit->native_amount = $converter->convert($budgetLimit->transactionCurrency, $userCurrency, today(), $budgetLimit->amount);
+        }
+        $budgetLimit->saveQuietly();
+        Log::debug('Bill native amounts are updated.');
+    }
+}