feat: implement pagination and enhance UI with modern design

app/Providers/AppServiceProvider.php

@@ -3,11 +3,13 @@
 namespace App\Providers;
 
 use Carbon\CarbonImmutable;
+use Illuminate\Contracts\Pagination\LengthAwarePaginator;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Facades\Date;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\URL;
 use Illuminate\Support\ServiceProvider;
+use Illuminate\Pagination\Paginator;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -31,5 +33,7 @@ class AppServiceProvider extends ServiceProvider
         Model::shouldBeStrict(! app()->isProduction());
 
         Date::use(CarbonImmutable::class);
+
+        Paginator::defaultSimpleView('vendor/pagination/simple-default');
     }
 }

app/Services/RateService.php

@@ -7,45 +7,56 @@ use App\Models\Rate;
 
 class RateService
 {
-    public function getFormattedRates(): array
+    public function getFormattedRates()
     {
         $supportedCities = City::query()
             ->whereIn('name', City::supportedCities()) // Filter only supported cities
             ->get()
             ->sortByDesc(fn($city) => $city->name === 'sanaa') // Sort to put 'sanaa' first
             ->values();  // Reset array keys to be sequential
-
-        // Get the latest exchange rates for each currency in each city
+        
         $latestRates = Rate::query()
+            ->whereIn('city_id', $supportedCities->pluck('id'))
             ->with('currency', 'city')
-            ->orderBy('city_id', 'asc')
-            ->orderBy('currency_id', 'asc')
-            ->orderBy('date', 'desc')
-            ->get()
-            ->groupBy(fn($rate) => $rate->city_id . '-' . $rate->currency_id)
-            ->map(fn($group) => $group->first())
-            ->groupBy('city_id');
+            ->orderBy('date', 'desc') // first sort by latest date
+            ->orderBy('city_id', 'asc') // then sort by city_id
+            ->orderBy('currency_id', 'asc') // then sort by currency_id
+            ->simplePaginate(4);
 
-
-        // Format the rates
-        $rates = $supportedCities->map(function ($city) use ($latestRates) {
-            $cityRates = $latestRates->get($city->id, collect())->map(function ($rate) {
+            $transformedRates = $latestRates->getCollection()
+                ->map(function($rate) {
+                    return [
+                        'city_name' => $rate->city->label,
+                        'currency_name' => $rate->currency->name,
+                        'buy_price' => $rate->buy_price,
+                        'sell_price' => $rate->sell_price,
+                        'date' => $rate->date->toDateString(),
+                        'day' => $rate->date->locale('ar')->isoFormat('dddd'),
+                        'is_today' => $rate->date->isToday(),
+                        'last_update' => $rate->updated_at->diffForHumans(),
+                    ];
+                })
+            ->groupBy('city_name')
+            ->map(function($cityRates, $cityName) {
                 return [
-                    'currency'    => $rate->currency->name,
-                    'buy_price'   => $rate->buy_price,
-                    'sell_price'  => $rate->sell_price,
-                    'date'        => $rate->date->toDateString(),
-                    'day'         => $rate->date->locale('ar')->isoFormat('dddd'),
-                    'last_update' => $rate->updated_at->diffForHumans(),
+                    'city' => $cityName,
+                    'rates' => $cityRates->map(function($rate) {
+                        return [
+                            'currency' => $rate['currency_name'],
+                            'buy_price' => $rate['buy_price'],
+                            'sell_price' => $rate['sell_price'],
+                            'date' => $rate['date'],
+                            'day' => $rate['day'],
+                            'is_today' => $rate['is_today'],
+                            'last_update' => $rate['last_update'],
+                        ];
+                    })->values()->toArray()
                 ];
-            })->values()->toArray();
+            })
+            ->values(); // Reset keys to be sequential
 
-            return [
-                'city'  => $city->label ,
-                'rates' => $cityRates,
-            ];
-        })->toArray();
+            $latestRates->setCollection($transformedRates);
 
-        return $rates;
+        return $latestRates;
     }
 }