sibedas/app/Models/RetributionFormula.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

class RetributionFormula extends Model
{
    protected $fillable = [
        'building_function_id',
        'name',
        'floor_number',
        'formula_expression'
    ];

    protected $casts = [
        'floor_number' => 'integer'
    ];

    /**
     * Building function relationship (n:1)
     */
    public function buildingFunction(): BelongsTo
    {
        return $this->belongsTo(BuildingFunction::class);
    }

    /**
     * Retribution proposals relationship (1:n)
     */
    public function retributionProposals(): HasMany
    {
        return $this->hasMany(RetributionProposal::class);
    }

    /**
     * Scope: By floor number
     */
    public function scopeByFloor($query, int $floorNumber)
    {
        return $query->where('floor_number', $floorNumber);
    }

    /**
     * Execute formula calculation with parameters and IP ketinggian
     */
    public function calculate(float $luasBangunan, array $parameters, float $ipKetinggian): float
    {
        // Extract parameters
        $fungsi_bangunan = $parameters['fungsi_bangunan'] ?? 0;
        $ip_permanen = $parameters['ip_permanen'] ?? 0;
        $ip_kompleksitas = $parameters['ip_kompleksitas'] ?? 0;
        $indeks_lokalitas = $parameters['indeks_lokalitas'] ?? 0;

        // Calculate H13 (floor coefficient) using Excel formula
        $h13 = $fungsi_bangunan * ($ip_permanen + $ip_kompleksitas + (0.5 * $ipKetinggian));

        // Calculate full retribution using Excel formula
        $baseValue = 70350;
        $additionalFactor = 0.5;
        
        // Main calculation: (1*D13*(N13*70350*H13*1))
        $mainCalculation = 1 * $luasBangunan * ($indeks_lokalitas * $baseValue * $h13 * 1);
        
        // Additional calculation: ($O$3*(1*D13*(N13*70350*H13*1)))
        $additionalCalculation = $additionalFactor * $mainCalculation;
        
        // Total: main + additional
        return $mainCalculation + $additionalCalculation;
    }

    /**
     * Get formula with parameter placeholders replaced for display
     */
    public function getDisplayFormula(array $parameters = []): string
    {
        $formula = $this->formula_expression;
        
        if (!empty($parameters)) {
            foreach ($parameters as $key => $value) {
                $formula = str_replace($key, "({$key}={$value})", $formula);
            }
        }
        
        return $formula;
    }

    /**
     * Check if this formula applies to given floor number
     */
    public function appliesTo(int $floorNumber): bool
    {
        // If floor_number is 0, formula applies to all floors
        if ($this->floor_number === 0) {
            return true;
        }
        
        // Otherwise, exact match required
        return $this->floor_number == $floorNumber;
    }

    /**
     * Get human readable floor description
     */
    public function getFloorDescription(): string
    {
        if ($this->floor_number === 0) {
            return 'Semua lantai';
        }
        
        return "Lantai {$this->floor_number}";
    }

    /**
     * Get default formula expression
     */
    public static function getDefaultFormula(): string
    {
        return '(fungsi_bangunan * (ip_permanen + ip_kompleksitas + (0.5 * ip_ketinggian)))';
    }

    /**
     * Validate formula expression syntax
     */
    public function validateFormula(): bool
    {
        // Basic validation - check if formula contains required variables
        $requiredVariables = ['fungsi_bangunan', 'ip_permanen', 'ip_kompleksitas', 'ip_ketinggian'];
        
        foreach ($requiredVariables as $variable) {
            if (strpos($this->formula_expression, $variable) === false) {
                return false;
            }
        }
        
        return true;
    }

    /**
     * Get calculation breakdown for debugging
     */
    public function getCalculationBreakdown(float $luasBangunan, array $parameters, float $ipKetinggian): array
    {
        // Extract parameters
        $fungsi_bangunan = $parameters['fungsi_bangunan'] ?? 0;
        $ip_permanen = $parameters['ip_permanen'] ?? 0;
        $ip_kompleksitas = $parameters['ip_kompleksitas'] ?? 0;
        $indeks_lokalitas = $parameters['indeks_lokalitas'] ?? 0;

        // Calculate H13 (floor coefficient)
        $h13 = $fungsi_bangunan * ($ip_permanen + $ip_kompleksitas + (0.5 * $ipKetinggian));

        // Calculate components
                    $baseValue = 70350;
        $additionalFactor = 0.5;
        $mainCalculation = 1 * $luasBangunan * ($indeks_lokalitas * $baseValue * $h13 * 1);
        $additionalCalculation = $additionalFactor * $mainCalculation;
        $totalCalculation = $mainCalculation + $additionalCalculation;

        return [
            'input_parameters' => [
                'luas_bangunan' => $luasBangunan,
                'fungsi_bangunan' => $fungsi_bangunan,
                'ip_permanen' => $ip_permanen,
                'ip_kompleksitas' => $ip_kompleksitas,
                'ip_ketinggian' => $ipKetinggian,
                'indeks_lokalitas' => $indeks_lokalitas,
                'base_value' => $baseValue,
                'additional_factor' => $additionalFactor
            ],
            'calculation_steps' => [
                'h13_calculation' => [
                    'formula' => 'fungsi_bangunan * (ip_permanen + ip_kompleksitas + (0.5 * ip_ketinggian))',
                    'calculation' => "{$fungsi_bangunan} * ({$ip_permanen} + {$ip_kompleksitas} + (0.5 * {$ipKetinggian}))",
                    'result' => $h13
                ],
                'main_calculation' => [
                    'formula' => '1 * luas_bangunan * (indeks_lokalitas * base_value * h13 * 1)',
                    'calculation' => "1 * {$luasBangunan} * ({$indeks_lokalitas} * {$baseValue} * {$h13} * 1)",
                    'result' => $mainCalculation
                ],
                'additional_calculation' => [
                    'formula' => 'additional_factor * main_calculation',
                    'calculation' => "{$additionalFactor} * {$mainCalculation}",
                    'result' => $additionalCalculation
                ],
                'total_calculation' => [
                    'formula' => 'main_calculation + additional_calculation',
                    'calculation' => "{$mainCalculation} + {$additionalCalculation}",
                    'result' => $totalCalculation
                ]
            ],
            'formatted_results' => [
                'h13' => number_format($h13, 6),
                'main_calculation' => 'Rp ' . number_format($mainCalculation, 2),
                'additional_calculation' => 'Rp ' . number_format($additionalCalculation, 2),
                'total_calculation' => 'Rp ' . number_format($totalCalculation, 2)
            ]
        ];
    }

    /**
     * Check if this formula has been used in any proposals
     */
    public function hasProposals(): bool
    {
        return $this->retributionProposals()->exists();
    }

    /**
     * Get total amount calculated using this formula
     */
    public function getTotalCalculatedAmount(): float
    {
        return $this->retributionProposals()->sum('total_retribution_amount');
    }

    /**
     * Get count of proposals using this formula
     */
    public function getProposalCount(): int
    {
        return $this->retributionProposals()->count();
    }
}