Kalkulator spalania paliwa

{
  "records": [
    {
      "id": 1,
      "date": "2026-02-10",
      "distance": 450,
      "liters": 36.5,
      "price_per_liter": 6.25,
      "consumption": 8.11,
      "total_cost": 228.13,
      "notes": "Trasa A4 Kraków-Wrocław",
      "created_at": "2026-02-10 18:30:00"
    },
    {
      "id": 2,
      "date": "2026-02-15",
      "distance": 120,
      "liters": 12.8,
      "price_per_liter": 6.30,
      "consumption": 10.67,
      "total_cost": 80.64,
      "notes": "Jazda miejska",
      "created_at": "2026-02-15 14:20:00"
    },
    {
      "id": 3,
      "date": "2026-02-18",
      "distance": 380,
      "liters": 28.5,
      "price_per_liter": 6.18,
      "consumption": 7.50,
      "total_cost": 176.13,
      "notes": "",
      "created_at": "2026-02-18 20:00:00"
    }
  ]
}

$distance = filter_var($_POST['distance'] ?? '', FILTER_VALIDATE_FLOAT);
$liters = filter_var($_POST['liters'] ?? '', FILTER_VALIDATE_FLOAT);

if ($distance === false || $distance <= 0) {
    $errors[] = "Dystans musi być liczbą dodatnią";
}

if ($liters === false || $liters <= 0) {
    $errors[] = "Ilość paliwa musi być liczbą dodatnią";
}

if ($liters > 500) {
    $errors[] = "Ilość paliwa wydaje się nieprawidłowa (max 500 l)";
}

if ($distance > 0 && $liters > 0 && ($liters / $distance) * 100 > 50) {
    $errors[] = "Spalanie wydaje się nierealistycznie wysokie";
}

function calculateConsumption(float $distance, float $liters): float {
    if ($distance <= 0) {
        return 0;
    }
    return round(($liters / $distance) * 100, 2);
}

function calculateTotalCost(float $liters, float $pricePerLiter): float {
    return round($liters * $pricePerLiter, 2);
}

function calculateCostPer100km(float $consumption, float $pricePerLiter): float {
    return round($consumption * $pricePerLiter, 2);
}

function formatConsumption(float $consumption): string {
    return number_format($consumption, 2, ',', ' ') . ' l/100km';
}

function formatCurrency(float $amount): string {
    return number_format($amount, 2, ',', ' ') . ' zł';
}

function formatDistance(float $km): string {
    return number_format($km, 0, ',', ' ') . ' km';
}

function calculateAverageConsumption(array $records): float {
    if (empty($records)) {
        return 0;
    }

    $totalDistance = 0;
    $totalLiters = 0;

    foreach ($records as $record) {
        $totalDistance += $record['distance'];
        $totalLiters += $record['liters'];
    }

    if ($totalDistance <= 0) {
        return 0;
    }

    return round(($totalLiters / $totalDistance) * 100, 2);
}

function getMonthlyReport(array $records, int $year, int $month): array {
    $monthRecords = array_filter($records, function($r) use ($year, $month) {
        $recordDate = strtotime($r['date']);
        return date('Y', $recordDate) == $year && date('n', $recordDate) == $month;
    });

    if (empty($monthRecords)) {
        return [
            'distance' => 0,
            'liters' => 0,
            'cost' => 0,
            'consumption' => 0,
            'trips' => 0,
        ];
    }

    $totalDistance = array_sum(array_column($monthRecords, 'distance'));
    $totalLiters = array_sum(array_column($monthRecords, 'liters'));
    $totalCost = array_sum(array_column($monthRecords, 'total_cost'));

    return [
        'distance' => $totalDistance,
        'liters' => round($totalLiters, 2),
        'cost' => round($totalCost, 2),
        'consumption' => calculateConsumption($totalDistance, $totalLiters),
        'trips' => count($monthRecords),
    ];
}