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<?php
header('Content-Type: application/json');
// Biểu giá điện bậc thang (giống như trong file HTML/JS)
$electricityTiers = [
['from' => 0,'to' => 50, 'price' => 1984], // Bậc 1
['from' => 51,'to' => 100, 'price' => 2050], // Bậc 2
['from' => 101,'to' => 200, 'price' => 2380], // Bậc 3
['from' => 201,'to' => 300, 'price' => 2998], // Bậc 4
['from' => 301,'to' => 400, 'price' => 3350], // Bậc 5
['from' => 401,'to' => INF, 'price' => 3460] // Bậc 6
];
const VAT_RATE = 0.08; // 8% VAT
/**
* Tính tổng tiền điện dựa trên tổng số kWh và biểu giá bậc thang.
*
* @param float $kwh Tổng số kWh tiêu thụ.
* @param array $tiers Mảng biểu giá điện.
* @return float Tổng tiền điện.
*/
function calculateGrandTotalBillPreTax($kwh, $tiers) {
if (!is_numeric($kwh) || $kwh < 0) {
return 0;
}
$kwh = floatval($kwh);
$totalCost = 0;
$remainingKwh = $kwh;
foreach ($tiers as $tier) {
if ($remainingKwh <= 0) {
break;
}
$kwhInThisTier = min($remainingKwh, $tier['limit']);
$totalCost += $kwhInThisTier * $tier['price'];
$remainingKwh -= $kwhInThisTier;
}
return $totalCost;
}
function tien_dien_moi_phong($so_ky,$mang_so_ky,$mang_bac_tien)
{
if (!is_numeric($so_ky) || $so_ky < 0 || empty($mang_so_ky)) {
return 0;
}
$count_so_ky_input = count($mang_so_ky);
$gia_tien = 0;
$dinh_muc = 0;
$so_ky_new = $so_ky/$count_so_ky_input;
foreach ($mang_bac_tien as $key=>$tier) {
$from_new = $tier['from']/$count_so_ky_input;
$to_new = $tier['to']/$count_so_ky_input;
if($from_new<=$so_ky_new && $to_new>=$so_ky_new){
$dinh_muc = $key;
break;
}
}
//echo $dinh_muc.'<br>';
$tong_gia_tien = 0;
$tong_so_ky_da_dung_trong_moi_bac = 0;
$dinh_muc = $dinh_muc+1;
for($i=0;$i<=$dinh_muc;$i++){
if($i<$dinh_muc) {
if($mang_bac_tien[$i]['to']!='INF') {
$so_ky_da_dung_trong_moi_bac = $mang_bac_tien[$i]['to'] / $count_so_ky_input;
$tong_so_ky_da_dung_trong_moi_bac += $so_ky_da_dung_trong_moi_bac;
if($i<=5) {
$gia_tien = $mang_bac_tien[$i]['price'] * ($so_ky_da_dung_trong_moi_bac);
}else{
$gia_tien = $mang_bac_tien[(count($mang_bac_tien)-1)]['price'] * ($so_ky_da_dung_trong_moi_bac);
}
}else{
$gia_tien = $mang_bac_tien[(count($mang_bac_tien)-1)]['price'] * ($so_ky-$tong_so_ky_da_dung_trong_moi_bac);
}
//echo $gia_tien.'<br>';
}elseif($i==$dinh_muc){
if($i<=5) {
$gia_tien = $mang_bac_tien[$i]['price']*($so_ky-$tong_so_ky_da_dung_trong_moi_bac);
}else{
$gia_tien = $mang_bac_tien[(count($mang_bac_tien)-1)]['price'] * ($so_ky-$tong_so_ky_da_dung_trong_moi_bac);
}
//echo $gia_tien.':2<br>';
}
$tong_gia_tien += $gia_tien;
}
return $tong_gia_tien;
}
$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;
}
$tien_dong = $_POST['tien_dong']??0;
if (!empty($kwhValuesFromPost)) {
$totalKwhAllRooms = array_sum($kwhValuesFromPost);
$calculatedRoomCosts = [];
$total_cost_vat = 0;
foreach ($kwhValuesFromPost as $individualKwh) {
$roomCostPreTax = 0;
$roomCostPostTax = 0;
if ($totalKwhAllRooms > 0) {
// Phân bổ chi phí trước thuế cho từng phòng dựa trên tỷ lệ tiêu thụ
$roomCostPreTax = tien_dien_moi_phong($individualKwh,$kwhValuesFromPost,$electricityTiers);
//echo $roomCostPreTax.'-------';
// Tính VAT cho phòng này
$vatAmountForRoom = $roomCostPreTax * VAT_RATE;
// Tiền phòng sau thuế
$roomCostPostTax = $roomCostPreTax + $vatAmountForRoom;
$arr_result[] = $roomCostPostTax;
$total_cost_vat += $roomCostPostTax;
}
$calculatedRoomCosts[] = [
'pre_tax' => $roomCostPreTax,
'post_tax' => $roomCostPostTax
];
}
$chenh_lech = 0;
$arr_tien_dong_thuc = array();
if($tien_dong>0){
$tong_so_kw = array_sum($kwhValuesFromPost);
$chenh_lech = $tien_dong-$total_cost_vat;
foreach($kwhValuesFromPost as $key=>$kw_tmp){
$tien_dong_thuc = $kw_tmp * $chenh_lech/$tong_so_kw;
/*if($tien_dong_thuc>0) {
$tien_du_or_bu = $arr_result[$key] + $tien_dong_thuc;
}else{
$tien_du_or_bu = $arr_result[$key] + $tien_dong_thuc;
}*/
$tien_du_or_bu = $arr_result[$key] + $tien_dong_thuc;
$arr_tien_dong_thuc[] = [
'tien_dong_thuc' => $tien_du_or_bu
];
}
}
$response['room_costs'] = $calculatedRoomCosts;
$response['total_cost_vat'] = $total_cost_vat;
$response['result_tien'] = $arr_tien_dong_thuc;
}
}
echo json_encode($response);
exit;
?>