Show bill average.

app/Http/Controllers/BillController.php

@@ -11,6 +11,7 @@ declare(strict_types = 1);
 
 namespace FireflyIII\Http\Controllers;
 
+use Carbon\Carbon;
 use FireflyIII\Http\Requests\BillFormRequest;
 use FireflyIII\Models\Bill;
 use FireflyIII\Models\TransactionJournal;
@@ -190,15 +191,20 @@ class BillController extends Controller
      */
     public function show(BillRepositoryInterface $repository, Bill $bill)
     {
+        /** @var Carbon $date */
+        $date           = session('start');
+        $year           = $date->year;
         $page           = intval(Input::get('page')) == 0 ? 1 : intval(Input::get('page'));
         $pageSize       = Preferences::get('transactionPageSize', 50)->data;
         $journals       = $repository->getJournals($bill, $page, $pageSize);
+        $yearAverage    = $repository->getYearAverage($bill, $date);
+        $overallAverage = $repository->getOverallAverage($bill);
         $journals->setPath('/bills/show/' . $bill->id);
         $bill->nextExpectedMatch = $repository->nextExpectedMatch($bill);
         $hideBill                = true;
         $subTitle                = e($bill->name);
 
-        return view('bills.show', compact('journals', 'hideBill', 'bill', 'subTitle'));
+        return view('bills.show', compact('journals', 'yearAverage', 'overallAverage', 'year', 'hideBill', 'bill', 'subTitle'));
     }
 
     /**

app/Repositories/Bill/BillRepository.php

@@ -557,4 +557,52 @@ class BillRepository implements BillRepositoryInterface
 
         return $wordMatch;
     }
+
+    /**
+     * @param Bill   $bill
+     * @param Carbon $date
+     *
+     * @return string
+     */
+    public function getYearAverage(Bill $bill, Carbon $date): string
+    {
+        $journals = $bill->transactionjournals()
+                         ->where('date', '>=', $date->year . '-01-01')
+                         ->where('date', '<=', $date->year . '-12-31')
+                         ->get();
+        $sum      = '0';
+        $count    = strval($journals->count());
+        /** @var TransactionJournal $journal */
+        foreach ($journals as $journal) {
+            $sum = bcadd($sum, TransactionJournal::amountPositive($journal));
+        }
+        $avg = '0';
+        if ($journals->count() > 0) {
+            $avg = bcdiv($sum, $count);
+        }
+
+        return $avg;
+    }
+
+    /**
+     * @param $bill
+     *
+     * @return string
+     */
+    public function getOverallAverage($bill): string
+    {
+        $journals = $bill->transactionjournals()->get();
+        $sum      = '0';
+        $count    = strval($journals->count());
+        /** @var TransactionJournal $journal */
+        foreach ($journals as $journal) {
+            $sum = bcadd($sum, TransactionJournal::amountPositive($journal));
+        }
+        $avg = '0';
+        if ($journals->count() > 0) {
+            $avg = bcdiv($sum, $count);
+        }
+
+        return $avg;
+    }
 }

app/Repositories/Bill/BillRepositoryInterface.php

@@ -32,6 +32,21 @@ interface BillRepositoryInterface
      */
     public function destroy(Bill $bill): bool;
 
+    /**
+     * @param Bill   $bill
+     * @param Carbon $date
+     *
+     * @return string
+     */
+    public function getYearAverage(Bill $bill, Carbon $date): string;
+
+    /**
+     * @param $bill
+     *
+     * @return string
+     */
+    public function getOverallAverage($bill): string;
+
     /**
      * Find a bill by ID.
      *

resources/lang/en_US/firefly.php

@@ -415,6 +415,8 @@ return [
     'cannot_scan_inactive_bill'                 => 'Inactive bills cannot be scanned.',
     'rescanned_bill'                            => 'Rescanned everything.',
     'bill_date_little_relevance'                => 'The only part of this date used by Firefly is the day. It is only useful when your bill arrives at exactly the same date every month. If the payment date of your bills varies, simply use the first of the month.',
+    'average_bill_amount_year'                  => 'Average bill amount (:year)',
+    'average_bill_amount_overall'               => 'Average bill amount (overall)',
 
     // accounts:
     'details_for_asset'                         => 'Details for asset account ":name"',

resources/views/bills/show.twig

@@ -60,6 +60,14 @@
                                 {% endif %}
                             </td>
                         </tr>
+                        <tr>
+                            <td>{{ trans('firefly.average_bill_amount_year', {year: year}) }}</td>
+                            <td>{{ '0'|formatAmount }}</td>
+                        </tr>
+                        <tr>
+                            <td>{{ 'average_bill_amount_overall'|_ }}</td>
+                            <td>{{ '0'|formatAmount }}</td>
+                        </tr>
                     </table>
                 </div>
             </div>