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Current File : //proc/self/root/proc/self/root/var/www/html/tien-dien/code/tiendien2/tinh_tiendien.php
<?php
header('Content-Type: application/json');

$electricityTiers = [
    ['from' => 0, 'to' => 50, 'price' => 1984],
    ['from' => 51, 'to' => 100, 'price' => 2050],
    ['from' => 101, 'to' => 200, 'price' => 2380],
    ['from' => 201, 'to' => 300, 'price' => 2998],
    ['from' => 301, 'to' => 400, 'price' => 3350],
    ['from' => 401, 'to' => INF, 'price' => 3460],
];

define('VAT_RATE', 0.08);

function calculateDetailedBill($kwh, $tiers)
{
    $details = [];
    $remainingKwh = $kwh;
    $total = 0;

    foreach ($tiers as $tier) {
        $tierFrom = $tier['from'];
        $tierTo = ($tier['to'] === INF) ? INF : $tier['to'];
        $tierLength = ($tierTo === INF) ? INF : $tierTo - $tierFrom + 1;
        $used = ($tierLength === INF) ? $remainingKwh : min($remainingKwh, $tierLength);

        if ($used <= 0) break;

        $cost = $used * $tier['price'];
        $details[] = [
            'range' => ($tierTo === INF) ? "$tierFrom trở lên" : "$tierFrom - $tierTo",
            'used' => $used,
            'price' => $tier['price'],
            'cost' => $cost
        ];

        $total += $cost;
        $remainingKwh -= $used;
    }

    return ['total' => $total, 'breakdown' => $details];
}

$response = ['room_costs' => []];
$kwhValuesFromPost = [];

if (isset($_POST['so_dien_phong']) && is_array($_POST['so_dien_phong'])) {
    foreach ($_POST['so_dien_phong'] as $val) {
        $kwh = filter_var($val, FILTER_VALIDATE_FLOAT);
        $kwhValuesFromPost[] = ($kwh !== false && $kwh >= 0) ? $kwh : 0;
    }

    $ten_phong_post = isset($_POST['ten_phong']) && is_array($_POST['ten_phong']) ? $_POST['ten_phong'] : [];

    $tien_dong = isset($_POST['tien_dong']) ? floatval($_POST['tien_dong']) : 0;

    if (!empty($kwhValuesFromPost)) {
        $total_cost_vat = 0;
        $room_results = [];

        foreach ($kwhValuesFromPost as $key => $individualKwh) {
            $bill = calculateDetailedBill($individualKwh, $electricityTiers);
            $pre_tax = $bill['total'];
            $vat = $pre_tax * VAT_RATE;
            $post_tax = $pre_tax + $vat;
            $total_cost_vat += $post_tax;

            $room_name = isset($ten_phong_post[$key]) && trim($ten_phong_post[$key]) !== '' ? trim($ten_phong_post[$key]) : 'Phòng ' . ($key + 1);

            $explanation = [];
            $explanation[] = "Giai đoạn 1: Tiền điện thực tế";
            $explanation[] = "Sử dụng: {$individualKwh} kWh";
            $explanation[] = "Tiền điện chưa VAT: " . number_format($pre_tax) . " VNĐ";
            $explanation[] = "VAT 8%: " . number_format($vat) . " VNĐ";
            $explanation[] = "Tổng cộng: " . number_format($post_tax) . " VNĐ";

            $room_results[$key] = [
                'pre_tax' => $pre_tax,
                'post_tax' => $post_tax,
                'explanation' => $explanation,
                'breakdown' => $bill['breakdown'],
                'ten_phong' => $room_name,
            ];
        }

        if ($tien_dong > 0) {
            $chenh_lech = $tien_dong - $total_cost_vat;
            $totalKwhAllRooms = array_sum($kwhValuesFromPost);
            foreach ($kwhValuesFromPost as $key => $kwh) {
                $ti_le = $totalKwhAllRooms > 0 ? $kwh / $totalKwhAllRooms : 0;
                $adjusted = $room_results[$key]['post_tax'] + ($chenh_lech * $ti_le);
                $room_results[$key]['tien_dong_thuc'] = $adjusted;

                $room_results[$key]['explanation'][] = "Giai đoạn 2: Tiền chênh lệch";
                $room_results[$key]['explanation'][] = "Tổng tiền đóng: " . number_format($tien_dong) . " VNĐ";
                $room_results[$key]['explanation'][] = "Chênh lệch toàn hệ thống: " . number_format($chenh_lech) . " VNĐ";
                $room_results[$key]['explanation'][] = "Tỉ lệ của phòng này: " . round($ti_le * 100, 2) . "%";
                $room_results[$key]['explanation'][] = "Tiền chênh lệch phòng: " . number_format($chenh_lech * $ti_le) . " VNĐ";

                $room_results[$key]['explanation'][] = "Giai đoạn 3: Tiền phải đóng";
                $room_results[$key]['explanation'][] = "Tổng cộng phải đóng: " . number_format($adjusted) . " VNĐ";
            }
        }

        $response['room_costs'] = $room_results;
        $response['total_cost_vat'] = $total_cost_vat;
    }
}

echo json_encode($response);
exit;
?>
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