<?php
require_once __DIR__ . '/../../connect.php'; 

try {
    $con_ride = Database::get('ride');
} catch (Exception $e) {
    error_log("[finish_ride_updates] Failed to connect to Ride Database: " . $e->getMessage());
}

// ============================================================
// finish_ride_updates.php — Atomic Server-to-Server
// ============================================================
// Driver App calls this ONCE with raw ride data (NOT the price).
// Server calculates price securely, processes payment via S2S,
// and atomically updates all databases within a transaction.
//
// Flow:
//   1. Receive raw params from driver app
//   2. Calculate price server-side (from DB + actual distance)
//   3. BEGIN TRANSACTION (local DB)
//   4. Update ride on local DB + remote DB (con_ride)
//   5. Update driver_orders
//   6. S2S cURL → Wallet Payment Server (process_ride_payments.php)
//   7. If payment OK → COMMIT, notify passenger (Socket + FCM)
//   8. If payment FAIL → ROLLBACK, ride stays 'Begin', safe retry
// ============================================================

// --- Secure S2S Configuration ---
define('S2S_SHARED_KEY', getenv('S2S_SHARED_KEY') );
define('WALLET_PAYMENT_URL', 'https://walletintaleq.intaleq.xyz/v1/main/ride/payment/process_ride_payments.php');

// ============================================================
// 1. Receive Raw Parameters (NO price from client)
// ============================================================
$rideId         = filterRequest("rideId");
$driver_id      = filterRequest("driver_id");
$passengerId    = filterRequest("passengerId");
$newStatus      = filterRequest("status");   // Expected: "Finished"
$actualDistance = filterRequest("actualDistance");
$actualDuration = filterRequest("actualDuration");
$passengerToken = filterRequest("passengerToken");
$driver_token   = filterRequest("driver_token");
$walletChecked  = filterRequest("walletChecked");
$passengerWalletBurc = filterRequest("passengerWalletBurc");

if (empty($rideId) || empty($newStatus) || empty($driver_id) || empty($passengerId)) {
    jsonError("Missing required parameters: rideId, driver_id, passengerId, status");
    exit;
}

if ($newStatus !== 'Finished') {
    jsonError("Invalid status. Expected: Finished");
    exit;
}

// ============================================================
// 2. Server-Side Price Calculation (Secure — NOT from client)
// ============================================================
try {
    // Fetch ride data from remote/local DB for server-side calculation
    $stmtRideData = $con->prepare("
        SELECT id, price AS quoted_price, car_type, 
               distance AS planned_distance, passenger_id, driver_id
        FROM ride WHERE id = ? AND driver_id = ?
        LIMIT 1
    ");
    $stmtRideData->execute([$rideId, $driver_id]);
    $rideData = $stmtRideData->fetch(PDO::FETCH_ASSOC);

    if (!$rideData) {
        jsonError("Ride not found or driver mismatch.");
        exit;
    }

    $quotedPrice    = floatval($rideData['quoted_price'] ?? 0);
    $kazanPercent   = 10;
    $carType        = $rideData['car_type'] ?? 'Fixed Price';

    // Fixed-price types: use quoted price as-is
    $fixedPriceTypes = ['Speed', 'Fixed Price', 'Awfar Car'];
    if (in_array($carType, $fixedPriceTypes)) {
        $finalPrice = $quotedPrice;
    } else {
        // Variable pricing: calculate from actual distance
        $cleanDist = preg_replace('/[^0-9.]/', '', $actualDistance);
        $distanceKm = floatval($cleanDist);

        if ($distanceKm <= 0) {
            $finalPrice = $quotedPrice; // fallback
        } else {
            $perKmRate  = getPerKmRate($carType);
            $perMinRate = getPerMinRate();
            $durationMin = intval(preg_replace('/[^0-9]/', '', $actualDuration));

            $calculated = ($distanceKm * $perKmRate) + ($durationMin * $perMinRate);
            $calculated *= (1 + ($kazanPercent / 100));

            $finalPrice = max($quotedPrice, round($calculated, 2));
        }
    }
} catch (PDOException $e) {
    jsonError("Error calculating price: " . $e->getMessage());
    exit;
}

// ============================================================
// 3. Atomic Transaction: Update DBs + Process Payment
// ============================================================
try {
    // --- Update Remote DB (con_ride) FIRST ---
    // (Not in transaction — remote DB doesn't support cross-DB rollback,
    //  but we keep it minimal as a "best-effort" update)
    if (isset($con_ride)) {
        $stmtRemote = $con_ride->prepare(
            "UPDATE ride SET status = ?, rideTimeFinish = NOW(), price = ? WHERE id = ? AND status = 'Begin'"
        );
        $stmtRemote->execute([$newStatus, $finalPrice, $rideId]);
    }

    // --- BEGIN Local DB Transaction ---
    $con->beginTransaction();

    // 3a. Update ride (local DB)
    $stmtLocal = $con->prepare(
        "UPDATE ride SET status = ?, rideTimeFinish = NOW(), price = ? WHERE id = ? AND status = 'Begin'"
    );
    $stmtLocal->execute([$newStatus, $finalPrice, $rideId]);

    if ($stmtLocal->rowCount() == 0) {
        throw new Exception("Ride already finished or not found in local DB.");
    }

    // 3b. Update driver_orders
    $checkStmt = $con->prepare("SELECT order_id FROM driver_orders WHERE order_id = ?");
    $checkStmt->execute([$rideId]);

    if ($checkStmt->rowCount() > 0) {
        $con->prepare("UPDATE driver_orders SET driver_id = ?, status = ?, created_at = NOW() WHERE order_id = ?")
            ->execute([$driver_id, $newStatus, $rideId]);
    } else {
        $con->prepare("INSERT INTO driver_orders (driver_id, order_id, created_at, status) VALUES (?, ?, NOW(), ?)")
            ->execute([$driver_id, $rideId, $newStatus]);
    }

    // ============================================================
    // 3c. Server-to-Server Payment Processing (S2S)
    // ============================================================
    $paymentPayload = [
        'rideId'              => $rideId,
        'driverId'            => $driver_id,
        'passengerId'         => $passengerId,
        'paymentAmount'       => $finalPrice,
        'paymentMethod'       => ($walletChecked === 'true') ? 'wallet' : 'cash',
        'walletChecked'       => $walletChecked,
        'passengerWalletBurc' => $passengerWalletBurc,
        'authToken'           => $driver_token,
    ];

    $ch = curl_init(WALLET_PAYMENT_URL);
    curl_setopt_array($ch, [
        CURLOPT_POST           => true,
        CURLOPT_POSTFIELDS     => http_build_query($paymentPayload),
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_TIMEOUT        => 15,
        CURLOPT_HTTPHEADER     => [
            'Content-Type: application/x-www-form-urlencoded',
            'X-S2S-Api-Key: ' . S2S_SHARED_KEY,
        ],
    ]);

    $paymentResponse = curl_exec($ch);
    $httpStatusCode  = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $curlError       = curl_error($ch);
    curl_close($ch);

    // Validate payment response
    $paymentSuccess = false;
    $paymentError   = '';

    if ($curlError) {
        $paymentError = "S2S connection error: " . $curlError;
    } elseif ($httpStatusCode !== 200) {
        $paymentError = "Payment server returned HTTP $httpStatusCode";
    } else {
        $paymentResult = json_decode($paymentResponse, true);
        if ($paymentResult && isset($paymentResult['status']) && $paymentResult['status'] === 'success') {
            $paymentSuccess = true;
        } else {
            $paymentError = $paymentResult['error'] ?? 'Payment server returned failure';
        }
    }

    if (!$paymentSuccess) {
        // ❌ Payment failed — ROLLBACK everything
        $con->rollBack();
        error_log("[finish_ride_updates] Payment FAILED for ride $rideId: $paymentError");
        jsonError("Payment processing failed: $paymentError");
        exit;
    }

    // ✅ Payment succeeded — COMMIT
    $con->commit();

    // ============================================================
    // 4. Notifications (After successful commit)
    // ============================================================
    $passenger_id = $passengerId; // alias for legacy code

    if (!empty($passenger_id)) {
        // Legacy list for backward compatibility
        $legacyList = [
            (string)$driver_id,
            (string)$rideId,
            (string)$driver_token,
            (string)$finalPrice
        ];

        // a) Socket notification
        $socketPayload = [
            'ride_id'    => $rideId,
            'status'     => 'finished',
            'price'      => $finalPrice,
            'DriverList' => $legacyList
        ];

        if (function_exists('notifyPassengerOnRideServer')) {
            notifyPassengerOnRideServer($passenger_id, $socketPayload);
        }

        // b) FCM notification
        if (!empty($passengerToken)) {
            $fcmData = [
                'ride_id'    => (string)$rideId,
                'price'      => (string)$finalPrice,
                'DriverList' => $legacyList
            ];

            sendFCM_Internal(
                $passengerToken,
                "تم إنهاء الرحلة 🏁",
                "المبلغ المطلوب: " . $finalPrice . " ل.س",
                $fcmData,
                'Driver Finish Trip',
                false
            );
        }
    }

    // ============================================================
    // 5. Return Success with server-calculated price
    // ============================================================
    jsonSuccess([
        'price'  => $finalPrice,
        'rideId' => $rideId
    ], "Ride finished and payment processed successfully.");

} catch (Exception $e) {
    if (isset($con) && $con->inTransaction()) {
        $con->rollBack();
    }
    error_log("[finish_ride_updates] Error for ride $rideId: " . $e->getMessage());
    jsonError("Transaction failed: " . $e->getMessage());
}

// ============================================================
// Helper Functions
// ============================================================

function getPerKmRate(string $carType): float {
    $rates = [
        'Comfort'     => 44,
        'Lady'        => 44,
        'Mishwar Vip' => 50,
        'Electric'    => 45,
        'Van'         => 63,
        'Delivery'    => 25,
        'Speed'       => 36,
        'Fixed Price' => 36,
        'Awfar Car'   => 36,
    ];
    return $rates[$carType] ?? 36;
}

function getPerMinRate(): float {
    $hour = (int)date('H');
    if ($hour >= 21 || $hour < 1) return 11;   // Late
    if ($hour >= 14 && $hour <= 17) return 10;  // Peak
    return 9;                                    // Normal
}
?>