feat: Enhance Cost Calculator with StayType integration and cost management features

Modules/CostCalculator/app/Models/CostCalculator.php

@@ -7,6 +7,7 @@ use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Modules\CCMS\Models\Country;
 use Modules\CourseFinder\Models\Program;
 use Modules\CourseFinder\Models\ProgramLevel;
+use Modules\CostCalculator\Models\StayType;
 
 // use Modules\CostCalculator\Database\Factories\CostCalculatorFactory;
 
@@ -15,19 +16,16 @@ class CostCalculator extends Model
     use HasFactory;
     use \Staudenmeir\EloquentJsonRelations\HasJsonRelationships;
 
-    /**
-     * The attributes that are mass assignable.
-     */
     protected $guarded = [];
 
     protected $casts = [
         'living_cost' => 'object',
         'accomodation_cost' => 'object',
         'onetime_cost' => 'object',
-        'other_services' => 'object',
+        'service_cost' => 'object'
     ];
 
-    public function institution()
+    public function country()
     {
         return $this->belongsTo(Country::class, 'country_id');
     }
@@ -41,4 +39,24 @@ class CostCalculator extends Model
     {
         return $this->belongsTo(Program::class, 'program_id');
     }
+
+    public function stayTypeLiving(): BelongsToMany
+    {
+        return $this->belongsToMany(StayType::class, 'living_costs', 'cost_calculator_id', 'stay_type_id')->withPivot('id', 'monthly', 'yearly')->withTimestamps();
+    }
+
+    public function stayTypeAccomodation(): BelongsToMany
+    {
+        return $this->belongsToMany(StayType::class, 'accomodation_costs', 'cost_calculator_id', 'stay_type_id')->withPivot('id', 'monthly', 'yearly')->withTimestamps();
+    }
+
+    public function stayTypeOnetime(): BelongsToMany
+    {
+        return $this->belongsToMany(StayType::class, 'onetime_costs', 'cost_calculator_id', 'stay_type_id')->withPivot('id', 'visa', 'biometrics', 'sevis', 'application')->withTimestamps();
+    }
+
+    public function stayTypeService(): BelongsToMany
+    {
+        return $this->belongsToMany(StayType::class, 'service_costs', 'cost_calculator_id', 'stay_type_id')->withPivot('id', 'flight_ticket', 'insurance', 'extra')->withTimestamps();
+    }
 }