create service count floor level and retributions

app/Models/MasterFormula.php

@@ -0,0 +1,81 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class MasterFormula extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'formula_code',
+        'formula_name',
+        'formula_expression',
+        'formula_category',
+        'description',
+        'usage_notes',
+    ];
+
+    /**
+     * Relationship to FormulaParameter (Many-to-Many dengan MasterParameter)
+     */
+    public function formulaParameters()
+    {
+        return $this->hasMany(FormulaParameter::class, 'formula_id');
+    }
+
+    /**
+     * Relationship to MasterParameter through FormulaParameter
+     */
+    public function parameters()
+    {
+        return $this->belongsToMany(MasterParameter::class, 'formula_parameters', 'formula_id', 'parameter_id');
+    }
+
+    /**
+     * Relationship to BuildingFunctionFormulaConfig
+     */
+    public function buildingConfigs()
+    {
+        return $this->hasMany(BuildingFunctionFormulaConfig::class, 'formula_id');
+    }
+
+    /**
+     * Scope untuk mencari berdasarkan kategori
+     */
+    public function scopeByCategory($query, $category)
+    {
+        return $query->where('formula_category', $category);
+    }
+
+    /**
+     * Method untuk mendapatkan parameter yang diperlukan formula ini
+     */
+    public function getRequiredParameters()
+    {
+        return $this->parameters()->get();
+    }
+
+    /**
+     * Method untuk evaluate formula dengan parameter values
+     */
+    public function evaluateFormula($parameterValues = [])
+    {
+        $expression = $this->formula_expression;
+        
+        // Replace parameter codes dengan nilai actual
+        foreach ($parameterValues as $parameterCode => $value) {
+            $expression = str_replace('{' . $parameterCode . '}', $value, $expression);
+        }
+        
+        // Evaluasi mathematical expression (hati-hati dengan security!)
+        // Untuk production, gunakan library yang aman seperti SymfonyExpressionLanguage
+        try {
+            return eval("return $expression;");
+        } catch (Exception $e) {
+            throw new \Exception("Error evaluating formula: " . $e->getMessage());
+        }
+    }
+}