src/Controller/CommunityController.php

@@ -59,32 +59,21 @@ class CommunityController implements IAuthenticationRequired
 
         \Container::$persistentDataManager->loadRelationsFromDb($community, false, ['main_currency']);
 
-        $balanceCalculator = new BalanceCalculator($community);
-        $debts = $balanceCalculator->calculate();
-        $debtItems = [];
-        $debtBalance = 0.0;
-        $outstandingItems = [];
-        $outstandingBalance = 0.0;
-        foreach ($debts as $debt) {
-            if ($debt['payer']->getId() === \Container::$request->user()->getUniqueId()) {
-                $debtBalance += $debt['amount'];
-                $debtItems[] = $debt;
-            }
-            if ($debt['payee']->getId() === \Container::$request->user()->getUniqueId()) {
-                $outstandingBalance += $debt['amount'];
-                $outstandingItems[] = $debt;
-            }
-        }
-        $balance = $outstandingBalance - $debtBalance;
+        /**
+        * @var User $user
+        */
+        $user = \Container::$request->user();
+        $balanceCalculator = new BalanceCalculator($community, $user);
+        $balance = $balanceCalculator->calculate();
 
         return new HtmlContent('communities/community', [
             'community' => $community,
             'upcomingAndRecentEvents' => iterator_to_array($this->eventRepository->getUpcomingAndRecentByCommunity($community, new DateTime(), 30, 3)),
-            'debtItems' => $debtItems,
-            'debtBalance' => $debtBalance,
-            'outstandingItems' => $outstandingItems,
-            'outstandingBalance' => $outstandingBalance,
-            'balance' => $balance,
+            'debtItems' => $balance['debtItems'],
+            'debtBalance' => $balance['debtBalance'],
+            'outstandingItems' => $balance['outstandingItems'],
+            'outstandingBalance' => $balance['outstandingBalance'],
+            'balance' => $balance['absoluteBalance'],
             'editPermission' => $ownCommunityMember->getOwner()
         ]);
     }

src/Controller/EventController.php

@@ -2,6 +2,7 @@
 
 use Container;
 use DateTime;
+use RVR\Finance\BalanceCalculator;
 use RVR\Finance\ExchangeRateCalculator;
 use RVR\PersistentData\Model\Community;
 use RVR\PersistentData\Model\CommunityMember;
@@ -105,10 +106,22 @@ class EventController implements IAuthenticationRequired, ISecured
         }
         Container::$persistentDataManager->loadRelationsFromDb($this->community, true, ['main_currency']);
 
+        /**
+        * @var User $user
+        */
+        $user = \Container::$request->user();
+        $balanceCalculator = new BalanceCalculator($this->community, $user, $event);
+        $balance = $balanceCalculator->calculate();
+
         return new HtmlContent('events/event', [
             'community' => $this->community,
             'event' => $event,
-            'totalCost' => $this->sumTransactions($event)
+            'totalCost' => $this->sumTransactions($event),
+            'debtItems' => $balance['debtItems'],
+            'debtBalance' => $balance['debtBalance'],
+            'outstandingItems' => $balance['outstandingItems'],
+            'outstandingBalance' => $balance['outstandingBalance'],
+            'balance' => $balance['absoluteBalance'],
         ]);
     }
 

src/Finance/BalanceCalculator.php

@@ -2,6 +2,8 @@
 
 use Container;
 use RVR\PersistentData\Model\Community;
+use RVR\PersistentData\Model\Event;
+use RVR\PersistentData\Model\User;
 use RVR\Repository\CommunityMemberRepository;
 use RVR\Repository\TransactionRepository;
 
@@ -9,6 +11,10 @@ class BalanceCalculator
 {
     private Community $community;
 
+    private User $user;
+
+    private ?Event $event;
+
     private TransactionRepository $transactionRepository;
 
     private CommunityMemberRepository $communityMemberRepository;
@@ -19,9 +25,13 @@ class BalanceCalculator
 
     private array $payments;
 
-    public function __construct(Community $community)
+    private array $actualDebts;
+
+    public function __construct(Community $community, User $user, ?Event $event = null)
     {
         $this->community = $community;
+        $this->user = $user;
+        $this->event = $event;
         $this->transactionRepository = new TransactionRepository();
         $this->communityMemberRepository = new CommunityMemberRepository();
         $this->exchangeRateCalculator = new ExchangeRateCalculator($this->community->getMainCurrency());
@@ -32,7 +42,8 @@ class BalanceCalculator
         $this->collectMembers();
         $this->createPaymentsMatrix();
         $this->sumTransactions();
-        return $this->calculateActualDebts();
+        $this->calculateActualDebts();
+        return $this->calculateBalanceForUser();
     }
 
     private function collectMembers(): void
@@ -57,7 +68,11 @@ class BalanceCalculator
     private function sumTransactions(): void
     {
         $membersCount = count($this->members);
+        if ($this->event !== null) {
+            $transactions = iterator_to_array($this->transactionRepository->getAllByEvent($this->event, true, ['currency']));
+        } else {
             $transactions = iterator_to_array($this->transactionRepository->getAllByCommunity($this->community, true, ['currency']));
+        }
         Container::$persistentDataManager->loadMultiRelationsFromDb($transactions, 'payees');
 
         foreach ($transactions as $transaction) {
@@ -77,20 +92,45 @@ class BalanceCalculator
         }
     }
 
-    private function calculateActualDebts(): array
+    private function calculateActualDebts(): void
     {
-        $actualDebts = [];
+        $this->actualDebts = [];
 
         foreach ($this->payments as $payerUserId => $paymentsOfPayer) {
             foreach ($paymentsOfPayer as $payeeUserId => $sum) {
                 $actualDebt = $this->payments[$payeeUserId][$payerUserId] - $sum;
 
                 if (round($actualDebt, $this->community->getMainCurrency()->getRoundDigits()) > 0.0) {
-                    $actualDebts[] = ['payer' => $this->members[$payerUserId], 'payee' => $this->members[$payeeUserId], 'amount' => $actualDebt];
+                    $this->actualDebts[] = ['payer' => $this->members[$payerUserId], 'payee' => $this->members[$payeeUserId], 'amount' => $actualDebt];
+                }
             }
         }
     }
 
-        return $actualDebts;
+    private function calculateBalanceForUser(): array
+    {
+        $debtItems = [];
+        $debtBalance = 0.0;
+        $outstandingItems = [];
+        $outstandingBalance = 0.0;
+        foreach ($this->actualDebts as $debt) {
+            if ($debt['payer']->getId() === $this->user->getId()) {
+                $debtBalance += $debt['amount'];
+                $debtItems[] = $debt;
+            }
+            if ($debt['payee']->getId() === $this->user->getId()) {
+                $outstandingBalance += $debt['amount'];
+                $outstandingItems[] = $debt;
+            }
+        }
+        $absoluteBalance = $outstandingBalance - $debtBalance;
+
+        return [
+            'absoluteBalance' => $absoluteBalance,
+            'debtItems' => $debtItems,
+            'debtBalance' => $debtBalance,
+            'outstandingItems' => $outstandingItems,
+            'outstandingBalance' => $outstandingBalance
+        ];
     }
 }

views/events/event.php

@@ -22,6 +22,33 @@
                     <td class="mono" style="text-align: right;"><?= number_format($totalCost, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
                 </tr>
             </table>
+            <table class="fullWidth marginTop">
+                <tr>
+                    <td class="bold">You owe*</td>
+                    <td class="mono red" style="text-align: right;"><?= number_format($debtBalance, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                </tr>
+                <?php foreach ($debtItems as $item): ?>
+                    <tr>
+                        <td class="small"><?= $item['payee']->getUser()->getDisplayName() ?></td>
+                        <td class="small mono red" style="text-align: right;"><?= number_format($item['amount'], $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                    </tr>
+                <?php endforeach; ?>
+                <tr>
+                    <td class="bold">You're owed*</td>
+                    <td class="mono green" style="text-align: right;"><?= number_format($outstandingBalance, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                </tr>
+                <?php foreach ($outstandingItems as $item): ?>
+                    <tr>
+                        <td class="small"><?= $item['payer']->getUser()->getDisplayName() ?></td>
+                        <td class="small mono green" style="text-align: right;"><?= number_format($item['amount'], $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                    </tr>
+                <?php endforeach; ?>
+                <tr>
+                    <td class="bold">Your balance*</td>
+                    <td class="mono <?= $balance < 0 ? 'red' : ($balance > 0 ? 'green' : '') ?>" style="text-align: right;;"><?= number_format($balance, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                </tr>
+            </table>
+            <p class="small right">* Virtual balance only for this event. Check <a href="<?= Container::$routeCollection->getRoute('community')->generateLink(['communitySlug' => $community->getSlug()]) ?>">community</a> finances for your real balance.</p>
         </div>
     </div>
 @endsection