sibedas/app/Services/DynamicRetributionCalculationService.php

<?php

namespace App\Services;

use App\Models\BuildingFunction;
use App\Models\MasterParameter;

/**
 * Retribution Calculation Service - Rundown 4 Implementation
 * 
 * Implementasi rumus Excel Rundown 4:
 * =ROUNDDOWN(($E13*($F13+$G13+(0.5*I$3))),4)
 * Retribusi = (1*D5*(N5*7035000*H5*1))+($O$3*(1*D5*(N5*7035000*H5*1)))
 */
class DynamicRetributionCalculationService
{
    /**
     * Calculate retribution using Rundown 4 formula
     */
    public function calculateRetribution($buildingFunctionId, $floorLevel, $luasBangunan, $indeksLokasi = 'sedang', $includeInfrastructure = true)
    {
        try {
            // Get parameters for this building function
            $parameters = $this->getParameterValues($buildingFunctionId, $floorLevel, $indeksLokasi);
            
            // Step 1: Calculate Rundown 4 per floor value
            $h5 = $this->calculateRundown4($parameters);
            
            // Step 2: Calculate basic retribution
            $basicRetribution = $parameters['koefisien_dasar'] * $luasBangunan * 
                               ($parameters['indeks_lokalitas'] * $parameters['tarif_dasar'] * $h5 * $parameters['koefisien_dasar']);
            
            // Step 3: Calculate infrastructure (optional)
            $infrastructureAmount = 0;
            $totalRetribution = $basicRetribution;
            
            if ($includeInfrastructure) {
                $infrastructureAmount = $parameters['asumsi_prasarana'] * $basicRetribution;
                $totalRetribution = $basicRetribution + $infrastructureAmount;
            }

            return [
                'success' => true,
                'building_function_id' => $buildingFunctionId,
                'floor_level' => $floorLevel,
                'luas_bangunan' => $luasBangunan,
                'indeks_lokalitas_type' => $indeksLokasi,
                'calculation_breakdown' => [
                    'rundown_4_calculation' => [
                        'excel_formula' => '=ROUNDDOWN(($E13*($F13+$G13+(0.5*I$3))),4)',
                        'fungsi_bangunan' => $parameters['fungsi'],
                        'ip_permanen' => $parameters['ip_permanen'],
                        'ip_kompleksitas' => $parameters['ip_kompleksitas'],
                        'multiplier_ketinggian' => $parameters['multiplier_ketinggian'],
                        'ip_ketinggian' => $parameters['ip_ketinggian'],
                        'before_rounddown' => $parameters['fungsi'] * ($parameters['ip_permanen'] + $parameters['ip_kompleksitas'] + ($parameters['multiplier_ketinggian'] * $parameters['ip_ketinggian'])),
                        'after_rounddown' => $h5,
                        'precision' => 4
                    ],
                    'retribution_calculation' => [
                        'basic_formula' => '1 * D5 * (N5 * 7035000 * H5 * 1)',
                        'infrastructure_formula' => 'O3 * basic_retribution',
                        'basic_amount' => $basicRetribution,
                        'infrastructure_amount' => $infrastructureAmount,
                        'total_amount' => $totalRetribution
                    ]
                ],
                'results' => [
                    'h5_rundown4' => $h5,
                    'basic_retribution' => $basicRetribution,
                    'infrastructure_amount' => $infrastructureAmount,
                    'total_retribution' => $totalRetribution
                ]
            ];

        } catch (\Exception $e) {
            return [
                'success' => false,
                'error' => $e->getMessage(),
                'building_function_id' => $buildingFunctionId,
                'floor_level' => $floorLevel
            ];
        }
    }

    /**
     * Calculate multiple floors retribution
     */
    public function calculateMultiFloorRetribution($buildingFunctionId, array $floors, $luasBangunan, $indeksLokasi = 'sedang')
    {
        $floorDetails = [];
        $totalRetribution = 0;

        foreach ($floors as $floor) {
            $result = $this->calculateRetribution($buildingFunctionId, $floor, $luasBangunan, $indeksLokasi, true);
            
            if ($result['success']) {
                $floorDetails[$floor] = $result['results'];
                $totalRetribution += $result['results']['total_retribution'];
            }
        }

        return [
            'success' => true,
            'building_function_id' => $buildingFunctionId,
            'floors' => $floors,
            'luas_bangunan' => $luasBangunan,
            'indeks_lokalitas_type' => $indeksLokasi,
            'floor_details' => $floorDetails,
            'total_retribution' => $totalRetribution,
            'average_per_floor' => count($floors) > 0 ? $totalRetribution / count($floors) : 0
        ];
    }

    /**
     * Calculate Rundown 4 per-floor value with ROUNDDOWN
     * Formula: =ROUNDDOWN(($E13*($F13+$G13+(0.5*I$3))),4)
     */
    private function calculateRundown4($parameters)
    {
        $calculation = $parameters['fungsi'] * 
                      ($parameters['ip_permanen'] + $parameters['ip_kompleksitas'] + 
                       ($parameters['multiplier_ketinggian'] * $parameters['ip_ketinggian']));
        
        // Apply ROUNDDOWN with 4 decimal places
        return floor($calculation * 10000) / 10000;
    }

    /**
     * Get parameter values for calculation
     */
    private function getParameterValues($buildingFunctionId, $floorLevel, $indeksLokasi)
    {
        $buildingFunction = BuildingFunction::find($buildingFunctionId);
        if (!$buildingFunction) {
            throw new \Exception("Building function not found: {$buildingFunctionId}");
        }

        $functionCode = strtolower($buildingFunction->code);
        
        $lokalitasMapping = [
            'rendah' => 'indeks_lokalitas_rendah',
            'sedang' => 'indeks_lokalitas_sedang', 
            'tinggi' => 'indeks_lokalitas_tinggi'
        ];
        
        $lokalitasParamCode = $lokalitasMapping[$indeksLokasi] ?? 'indeks_lokalitas_sedang';
        
        $parameterCodes = [
            'tarif_dasar',
            'koefisien_dasar',
            'multiplier_ketinggian',
            'asumsi_prasarana',
            $lokalitasParamCode,
            "ip_ketinggian_{$floorLevel}",
            "fungsi_{$functionCode}",
            "ip_permanen_{$functionCode}",
            "ip_kompleksitas_{$functionCode}"
        ];
        
        $parameters = MasterParameter::whereIn('parameter_code', $parameterCodes)->get();
        
        $values = [];
        foreach ($parameters as $param) {
            $values[$param->parameter_code] = $param->default_value;
        }
        
        return [
            'tarif_dasar' => $values['tarif_dasar'] ?? 7035000,
            'koefisien_dasar' => $values['koefisien_dasar'] ?? 1,
            'multiplier_ketinggian' => $values['multiplier_ketinggian'] ?? 0.5,
            'asumsi_prasarana' => $values['asumsi_prasarana'] ?? 0.5,
            'indeks_lokalitas' => $values[$lokalitasParamCode] ?? 0.004,
            'ip_ketinggian' => $values["ip_ketinggian_{$floorLevel}"] ?? 1.0,
            'fungsi' => $values["fungsi_{$functionCode}"] ?? 0,
            'ip_permanen' => $values["ip_permanen_{$functionCode}"] ?? 0,
            'ip_kompleksitas' => $values["ip_kompleksitas_{$functionCode}"] ?? 0
        ];
    }
}