chinh sua theo tieu chuan phan mem BDS_1

app/Models/Product.php

@@ -42,4 +42,25 @@ class Product extends Model
     {
         return $this->hasMany(Appendix::class);
     }
+
+    public function salesPhases()
+    {
+        return $this->belongsToMany(SalesPhase::class, 'sales_phase_products')
+                    ->using(SalesPhaseProduct::class)
+                    ->withPivot('id', 'sale_price', 'land_value', 'foundation_value', 'discount_details', 'status')
+                    ->withTimestamps();
+    }
+
+    public function activeSalesPhase()
+    {
+        return $this->salesPhases()
+                    ->wherePivot('status', 'Còn hàng')
+                    ->where('sales_phases.status', 'Đang mở bán')
+                    ->whereDate('sales_phases.start_date', '<=', now())
+                    ->where(function ($q) {
+                        $q->whereNull('sales_phases.end_date')
+                          ->orWhereDate('sales_phases.end_date', '>=', now());
+                    })
+                    ->first();
+    }
 }