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<?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) ? $kwh : $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;
}
$tien_dong = $_POST['tien_dong'] ?? 0;
if (!empty($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;
$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' => $bill['breakdown']
];
}
// Giai đoạn 2 & 3
if ($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;