adds feature to backfill daily change

app/Models/Portfolio.php

@@ -2,7 +2,10 @@
 
 namespace App\Models;
 
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Database\Eloquent\Model;
+use App\Interfaces\MarketData\MarketDataInterface;
 use Illuminate\Database\Eloquent\Concerns\HasUuids;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 
@@ -74,7 +77,8 @@ class Portfolio extends Model
         return $this->users()->firstWhere('owner', 1)?->id;
     }
 
-    public static function syncUsers(self $model) {
+    public static function syncUsers(self $model) 
+    {
         // make sure we don't remove owner access
         $user_id[$model->owner_id ?? auth()->user()->id] = ['owner' => true];
 
@@ -86,4 +90,68 @@ class Portfolio extends Model
         // save
         $model->users()->sync($user_id);
     }
+
+    public function syncDailyChanges(): void
+    {
+        $holdings = $this->holdings()
+                ->join('transactions', function($join) {
+                    $join->on('transactions.symbol', '=', 'holdings.symbol')
+                         ->where('transactions.portfolio_id', '=', $this->id); 
+                })
+                ->select('holdings.*', DB::raw('min(transactions.date) as first_transaction_date')) // get first transaction date
+                ->groupBy('holdings.symbol') 
+                ->get();
+        
+        $total_performance = [];
+
+        $holdings->each(function($holding) use (&$total_performance) {
+
+            $all_history = app(MarketDataInterface::class)->history('ACME', $holding->first_transaction_date, now());
+            $quantity = $holding->dailyPerformance($holding->first_transaction_date, now());
+
+            $dividends = $holding->dividends->keyBy(function ($dividend, $key) {
+                                        return $dividend['date']->format('Y-m-d');
+                                    })->toArray();
+
+            $dividends_earned = 0;
+            $daily_performance = [];
+
+            $all_history->sortBy('date')->each(function ($history, $date) use ($quantity, $dividends, &$daily_performance, &$dividends_earned) {
+
+                $close = Arr::get($history, 'close', 0);
+                $total_market_value = $quantity->get($date)->owned * $close;
+                $dividend = Arr::get($dividends, $date, []);
+                $dividends_earned += $quantity->get($date)->owned * Arr::get($dividend, 'dividend_amount', 0);
+
+                $daily_performance[$date] = [
+                    'date' => $date,
+                    'portfolio_id' => $this->id,
+                    'total_market_value' => $total_market_value, 
+                    'total_cost_basis' => $quantity->get($date)->cost_basis,
+                    'total_gain' => $total_market_value - $quantity->get($date)->cost_basis,
+                    'realized_gains' => $quantity->get($date)->realized_gains,
+                    'total_dividends_earned' => $dividends_earned
+                ];
+            });
+
+            foreach ($daily_performance as $date => $performance) {
+                if (!isset($total_performance[$date])) {
+                    
+                    $total_performance[$date] = $performance;
+
+                } else {
+                    
+                    $total_performance[$date]['total_market_value'] += $performance['total_market_value'];
+                    $total_performance[$date]['total_cost_basis'] += $performance['total_cost_basis'];
+                    $total_performance[$date]['total_gain'] += $performance['total_gain'];
+                    $total_performance[$date]['realized_gains'] += $performance['realized_gains'];
+                    $total_performance[$date]['total_dividends_earned'] += $performance['total_dividends_earned'];
+                }
+            }
+        });
+
+        $this->daily_change()->delete();
+
+        DailyChange::insert($total_performance);
+    }
 }