done restructure calculation retribution

app/Traits/HasRetributionCalculation.php

@@ -0,0 +1,79 @@
+<?php
+
+namespace App\Traits;
+
+use App\Models\RetributionCalculation;
+use App\Models\CalculableRetribution;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+use Illuminate\Database\Eloquent\Relations\MorphOne;
+
+trait HasRetributionCalculation
+{
+    /**
+     * Get all retribution calculations for this model (polymorphic many-to-many)
+     */
+    public function retributionCalculations(): MorphMany
+    {
+        return $this->morphMany(CalculableRetribution::class, 'calculable');
+    }
+
+    /**
+     * Get active retribution calculation
+     */
+    public function activeRetributionCalculation(): MorphOne
+    {
+        return $this->morphOne(CalculableRetribution::class, 'calculable')
+                    ->where('is_active', true)
+                    ->latest('assigned_at');
+    }
+
+    /**
+     * Assign calculation to this model
+     */
+    public function assignRetributionCalculation(RetributionCalculation $calculation, string $notes = null): CalculableRetribution
+    {
+        // Deactivate previous active calculation
+        $this->retributionCalculations()
+             ->where('is_active', true)
+             ->update(['is_active' => false]);
+
+        // Create new assignment
+        return $this->retributionCalculations()->create([
+            'retribution_calculation_id' => $calculation->id,
+            'is_active' => true,
+            'assigned_at' => now(),
+            'notes' => $notes,
+        ]);
+    }
+
+    /**
+     * Get current retribution amount
+     */
+    public function getCurrentRetributionAmount(): float
+    {
+        $activeCalculation = $this->activeRetributionCalculation;
+        
+        return $activeCalculation 
+            ? $activeCalculation->retributionCalculation->retribution_amount 
+            : 0;
+    }
+
+    /**
+     * Check if has active calculation
+     */
+    public function hasActiveRetributionCalculation(): bool
+    {
+        return $this->activeRetributionCalculation()->exists();
+    }
+
+    /**
+     * Get calculation history
+     */
+    public function getRetributionCalculationHistory()
+    {
+        return $this->retributionCalculations()
+                    ->with('retributionCalculation')
+                    ->orderBy('assigned_at', 'desc')
+                    ->get();
+    }
+}