Fix #4198

app/Providers/EventServiceProvider.php

@@ -39,8 +39,11 @@ use FireflyIII\Events\UpdatedTransactionGroup;
 use FireflyIII\Events\UserChangedEmail;
 use FireflyIII\Events\WarnUserAboutBill;
 use FireflyIII\Mail\OAuthTokenCreatedMail;
+use FireflyIII\Models\BudgetLimit;
 use FireflyIII\Models\PiggyBank;
 use FireflyIII\Models\PiggyBankRepetition;
+use FireflyIII\Repositories\Budget\AvailableBudgetRepositoryInterface;
+use FireflyIII\Repositories\Budget\BudgetLimitRepositoryInterface;
 use FireflyIII\Repositories\User\UserRepositoryInterface;
 use Illuminate\Auth\Events\Login;
 use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
@@ -150,6 +153,54 @@ class EventServiceProvider extends ServiceProvider
     {
         parent::boot();
         $this->registerCreateEvents();
+        $this->registerBudgetEvents();
+    }
+
+    /**
+     *
+     */
+    protected function registerBudgetEvents(): void
+    {
+        $func = static function (BudgetLimit $limit) {
+            Log::debug('Trigger budget limit event.');
+            // find available budget with same period and same currency or create it.
+            // then set it or add money:
+            $user            = $limit->budget->user;
+            $availableBudget = $user
+                ->availableBudgets()
+                ->where('start_date', $limit->start_date->format('Y-m-d'))
+                ->where('end_date', $limit->end_date->format('Y-m-d'))
+                ->where('transaction_currency_id', $limit->transaction_currency_id)
+                ->first();
+            // update!
+            if (null !== $availableBudget) {
+
+                $repository = app(BudgetLimitRepositoryInterface::class);
+                $repository->setUser($user);
+                $set = $repository->getAllBudgetLimitsByCurrency($limit->transactionCurrency, $limit->start_date, $limit->end_date);
+                $sum = (string) $set->sum('amount');
+
+
+                Log::debug(sprintf('Because budget limit #%d had its amount changed to %s, available budget limit #%d will be updated.', $limit->id, $limit->amount, $availableBudget->id));
+                $availableBudget->amount = $sum;
+                $availableBudget->save();
+                return;
+            }
+            Log::debug('Does not exist, create it.');
+            // create it.
+            $data       = [
+                'amount'      => $limit->amount,
+                'start'       => $limit->start_date,
+                'end'         => $limit->end_date,
+                'currency_id' => $limit->transaction_currency_id,
+            ];
+            $repository = app(AvailableBudgetRepositoryInterface::class);
+            $repository->setUser($user);
+            $repository->store($data);
+        };
+
+        BudgetLimit::created($func);
+        BudgetLimit::updated($func);
     }
 
     /**
@@ -157,6 +208,8 @@ class EventServiceProvider extends ServiceProvider
      */
     protected function registerCreateEvents(): void
     {
+
+
         // in case of repeated piggy banks and/or other problems.
         PiggyBank::created(
             static function (PiggyBank $piggyBank) {