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// Matrix Plan Commission Calculation
<?php

class MatrixCommissionCalculator {
    private $matrixWidth = 3;
    private $matrixDepth = 5;
    private $levelPercentages = [20, 10, 5, 3, 2];
    
    public function calculateMatrixCommission(User $user) {
        $totalCommission = 0;
        
        for ($level = 0; $level < $this->matrixDepth; $level++) {
            $downlineUsers = $this->getLevelDownline($user, $level);
            $levelSales = $this->calculateLevelSales($downlineUsers);
            
            $levelCommission = $levelSales * ($this->levelPercentages[$level] / 100);
            $totalCommission += $levelCommission;
        }
        
        return $totalCommission;
    }
    
    private function getLevelDownline(User $user, $level) {
        if ($level === 0) {
            return $user->getDirectReferrals();
        }
        
        $downline = [];
        $previousLevel = $this->getLevelDownline($user, $level - 1);
        
        foreach ($previousLevel as $downlineUser) {
            $downline = array_merge($downline, $downlineUser->getDirectReferrals());
        }
        
        return $downline;
    }
}