RVRNEXT-7 show balances on community home page

public/static/css/rvr.css

@@ -31,7 +31,7 @@ main {
     color: #ffffff;
 }
 
-::placeholder, select > option[value=""] {
+::placeholder, select > option[value=""], .gray {
     color: #8e8e8e;
 }
 
@@ -67,7 +67,7 @@ p, h2, h3 {
     line-height: 150%;
 }
 
-p {
+p, th, td {
     font-weight: 400;
     font-size: 16px;
 }
@@ -104,10 +104,23 @@ hr {
     font-weight: 700;
 }
 
-p.small, span.small {
+p.small, span.small, td.small {
     font-size: 14px;
 }
 
+.red {
+    color: #a80908;
+}
+
+.green {
+    color: #008000;
+}
+
+.mono {
+    font-family: 'Oxygen Mono', mono;
+    font-weight: 400;
+}
+
 .justify {
     text-align: justify;
 }

src/Controller/CommunityController.php

@@ -1,6 +1,7 @@
 <?php namespace RVR\Controller;
 
 use DateTime;
+use RVR\Finance\BalanceCalculator;
 use RVR\PersistentData\Model\Community;
 use RVR\PersistentData\Model\CommunityMember;
 use RVR\PersistentData\Model\Currency;
@@ -50,11 +51,34 @@ class CommunityController implements IAuthenticationRequired
 
         \Container::$persistentDataManager->loadRelationsFromDb($community, false, ['main_currency']);
 
+        $balanceCalculator = new BalanceCalculator($community);
+        $debts = $balanceCalculator->calculate();
+        $debtUsers = [];
+        $debtBalance = 0.0;
+        $outstandingUsers = [];
+        $outstandingBalance = 0.0;
+        foreach ($debts as $debt) {
+            if ($debt['payer']->getId() === \Container::$request->user()->getUniqueId()) {
+                $debtBalance += $debt['amount'];
+                $debtUsers[] = $debt;
+            }
+            if ($debt['payee']->getId() === \Container::$request->user()->getUniqueId()) {
+                $outstandingBalance += $debt['amount'];
+                $outstandingUsers[] = $debt;
+            }
+        }
+        $balance = $outstandingBalance - $debtBalance;
+
         return new HtmlContent('communities/community', [
             'community' => $community,
             'members' => $this->getMembers($community),
             'currencies' => $this->getCurrencies($community),
             'upcomingEvents' => [],
+            'debtUsers' => $debtUsers,
+            'debtBalance' => $debtBalance,
+            'outstandingUsers' => $outstandingUsers,
+            'outstandingBalance' => $outstandingBalance,
+            'balance' => $balance,
             'editPermission' => $ownCommunityMember->getOwner()
         ]);
     }

src/Finance/BalanceCalculator.php

@@ -0,0 +1,90 @@
+<?php namespace RVR\Finance;
+
+use RVR\PersistentData\Model\Community;
+use RVR\Repository\CommunityMemberRepository;
+use RVR\Repository\TransactionRepository;
+
+class BalanceCalculator
+{
+    private Community $community;
+
+    private TransactionRepository $transactionRepository;
+
+    private CommunityMemberRepository $communityMemberRepository;
+
+    private ExchangeRateCalculator $exchangeRateCalculator;
+
+    private array $members;
+
+    private array $payments;
+
+    public function __construct(Community $community)
+    {
+        $this->community = $community;
+        $this->transactionRepository = new TransactionRepository();
+        $this->communityMemberRepository = new CommunityMemberRepository();
+        $this->exchangeRateCalculator = new ExchangeRateCalculator($this->community->getMainCurrency());
+    }
+
+    public function calculate(): array
+    {
+        $this->collectMembers();
+        $this->createPaymentsMatrix();
+        $this->sumTransactions();
+        return $this->calculateActualDebts();
+    }
+
+    private function collectMembers(): void
+    {
+        $this->members = [];
+        foreach ($this->communityMemberRepository->getAllByCommunity($this->community, true, ['user']) as $member) {
+            $this->members[$member->getUserId()] = $member;
+        }
+    }
+
+    private function createPaymentsMatrix(): void
+    {
+        $this->payments = [];
+        foreach ($this->members as $payerUserId => $member) {
+            $this->payments[$payerUserId] = [];
+            foreach ($this->members as $payeeUserId => $member) {
+                $this->payments[$payerUserId][$payeeUserId] = 0;
+            }
+        }
+    }
+
+    private function sumTransactions(): void
+    {
+        $membersCount = count($this->members);
+        $transactions = $this->transactionRepository->getAllByCommunity($this->community, true, ['currency']);
+
+        foreach ($transactions as $transaction) {
+            $sum = $this->exchangeRateCalculator->calculate($transaction->getSum(), $transaction->getCurrency(), $transaction->getTimeDate());
+
+            if ($transaction->getPayeeUserId()) {
+                $this->payments[$transaction->getPayerUserId()][$transaction->getPayeeUserId()] += $sum;
+            } else {
+                foreach ($this->members as $payeeUserId => $member) {
+                    $this->payments[$transaction->getPayerUserId()][$payeeUserId] += $sum / $membersCount;
+                }
+            }
+        }
+    }
+
+    private function calculateActualDebts(): array
+    {
+        $actualDebts = [];
+
+        foreach ($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];
+                }
+            }
+        }
+
+        return $actualDebts;
+    }
+}

views/communities/community.php

@@ -49,16 +49,28 @@
             <a href="<?= Container::$routeCollection->getRoute('community.transactions')->generateLink(['communityId' => $community->getId()]) ?>">Transactions</a>
             <table class="fullWidth marginTop">
                 <tr>
-                    <td>You owe</td>
-                    <td style="text-align: right; color: red;"><?= number_format(0, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                    <td class="bold">You owe</td>
+                    <td class="mono red" style="text-align: right;"><?= number_format($debtBalance, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
                 </tr>
+                <?php foreach ($debtUsers as $owe): ?>
+                    <tr>
+                        <td class="small"><?= $owe['payee']->getUser()->getDisplayName() ?></td>
+                        <td class="small mono red" style="text-align: right;"><?= number_format($owe['amount'], $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                    </tr>
+                <?php endforeach; ?>
                 <tr>
-                    <td>You're owed</td>
-                    <td style="text-align: right; color: green;"><?= number_format(0, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                    <td class="bold">You're owed</td>
+                    <td class="mono green" style="text-align: right;"><?= number_format($outstandingBalance, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
                 </tr>
+                <?php foreach ($outstandingUsers as $owe): ?>
+                    <tr>
+                        <td class="small"><?= $owe['payer']->getUser()->getDisplayName() ?></td>
+                        <td class="small mono green" style="text-align: right;"><?= number_format($owe['amount'], $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                    </tr>
+                <?php endforeach; ?>
                 <tr>
-                    <td>Your balance</td>
-                    <td style="text-align: right;"><?= number_format(0, $mainCurrencyRoundDigits) ?> <?= $mainCurrencyCode ?></td>
+                    <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>
         </div>

views/templates/rvr.php

@@ -9,13 +9,14 @@
     <?php if (preg_match('/^(http(s)?:)?\/\//', $_ENV['STATIC_ROOT']) === 1): ?>
         <link href="<?= $_ENV['STATIC_ROOT'] ?>" rel="preconnect">
     <?php endif; ?>
-    <link href="https://fonts.gstatic.com" rel="preconnect">
+    <link href="https://fonts.googleapis.com" rel="preconnect">
+    <link href="https://fonts.gstatic.com" rel="preconnect" crossorigin>
     <?php if (!empty($_ENV['GOOGLE_ANALITICS_ID'])): ?>
         <link href="https://www.googletagmanager.com" rel="preconnect">
         <link href="https://www.google-analytics.com" rel="preconnect">
     <?php endif; ?>
-    <link href="https://fonts.googleapis.com/css2?family=Oxygen:wght@400;700&amp;display=swap" rel="stylesheet">
-    <link href="https://fonts.googleapis.com/css2?family=Oxygen+Mono:wght@400&amp;display=swap" rel="stylesheet">
+    <link href="https://fonts.googleapis.com/css2?family=Oxygen:wght@400;700&amp;display=block" rel="stylesheet">
+    <link href="https://fonts.googleapis.com/css2?family=Oxygen+Mono:wght@400&amp;display=block" rel="stylesheet">
     <link href="<?= $_ENV['STATIC_ROOT'] ?>/css/rvr.css?rev=<?= REVISION ?>" rel="stylesheet">
     @yields('externalCss')
     @yields('inlineCss')