Add observers for amounts.

app/Handlers/Observer/AutoBudgetObserver.php

@@ -0,0 +1,58 @@
+<?php
+/*
+ * AutoBudgetObserver.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\AutoBudget;
+use FireflyIII\Support\Http\Api\ExchangeRateConverter;
+use Illuminate\Support\Facades\Log;
+
+class AutoBudgetObserver
+{
+    public function updated(AutoBudget $autoBudget): void
+    {
+        Log::debug('Observe "updated" of an auto budget.');
+        $this->updateNativeAmount($autoBudget);
+    }
+
+    public function created(AutoBudget $autoBudget): void
+    {
+        Log::debug('Observe "created" of an auto budget.');
+        $this->updateNativeAmount($autoBudget);
+    }
+
+    private function updateNativeAmount(AutoBudget $autoBudget): void
+    {
+        $userCurrency = app('amount')->getDefaultCurrencyByUserGroup($autoBudget->budget->user->userGroup);
+        $autoBudget->native_amount =null;
+        if ($autoBudget->transactionCurrency->id !== $userCurrency->id) {
+            $converter = new ExchangeRateConverter();
+            $converter->setIgnoreSettings(true);
+            $autoBudget->native_amount = $converter->convert($autoBudget->transactionCurrency, $userCurrency, today(), $autoBudget->amount);
+        }
+        $autoBudget->saveQuietly();
+        Log::debug('Auto budget native amount is updated.');
+    }
+
+
+}