<?php
include '../../connect.php';

error_reporting(E_ALL);
ini_set('display_errors', 0);
header('Content-Type: application/json');

$driverID = filterRequest('driverID');
$amount = floatval(filterRequest('amount'));

if (empty($driverID) || empty($amount) || $amount <= 0) {
    echo json_encode(['status' => 'error', 'message' => 'Missing required fields or invalid amount']);
    exit;
}

try {
    $con->beginTransaction();

    // 1. Fetch current budget
    $stmt = $con->prepare("SELECT SUM(amount) as diff FROM payments WHERE captain_id = :driverID FOR UPDATE");
    $stmt->execute([':driverID' => $driverID]);
    $sumRow = $stmt->fetch(PDO::FETCH_ASSOC);
    $totalBudget = floatval($sumRow['diff']);

    if ($totalBudget < $amount) {
        $con->rollBack();
        echo json_encode(['status' => 'error', 'message' => 'Insufficient budget']);
        exit;
    }

    // 2. Generate unique tokens
    $paymentID1 = "budget2pt_" . time() . rand(1000, 9999);
    $paymentID2 = "pt2budget_" . time() . rand(1000, 9999);
    $token1 = md5(uniqid("b1", true));
    $token2 = md5(uniqid("b2", true));

    // 3. Deduct from budget (payments)
    $deductAmount = -$amount;
    $stmt = $con->prepare("INSERT INTO payments (captain_id, amount, rideId, payment_method, passengerID, token) 
                           VALUES (:driverID, :amount, :rideId, 'myBudget', 'myBudgetToPoint', :token)");
    $stmt->execute([
        ':driverID' => $driverID,
        ':amount' => $deductAmount,
        ':rideId' => $paymentID1,
        ':token' => $token1
    ]);

    // 4. Add to points (paymentsDriverPoints)
    $stmt = $con->prepare("INSERT INTO paymentsDriverPoints (captain_id, paymentID, amount, token, paymentMethod) 
                           VALUES (:driverID, :paymentID, :amount, :token, 'fromBudget')");
    $stmt->execute([
        ':driverID' => $driverID,
        ':paymentID' => $paymentID2,
        ':amount' => $amount,
        ':token' => $token2
    ]);

    // Commit Transaction
    $con->commit();

    echo json_encode(['status' => 'success', 'message' => 'Budget converted to points successfully']);

} catch (Exception $e) {
    $con->rollBack();
    echo json_encode(['status' => 'error', 'message' => 'Database transaction failed: ' . $e->getMessage()]);
}
?>