<?php
// ═══════════════════════════════════════════════════════════════
// driver/ride/create_call_session.php
// PURPOSE  : Create a WebRTC call session and notify passenger via FCM
// APP      : driver
// AUTH     : JWT:driver
// ═══════════════════════════════════════════════════════════════

declare(strict_types=1);

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

try {
    if ($role !== 'driver' || empty($user_id)) {
        printFailure('Unauthorized access');
        exit;
    }
    
    $rideId = $_POST['ride_id'] ?? null;
    if (!$rideId) {
        printFailure('Ride ID is required');
        exit;
    }

    // 1. Verify ride details and retrieve associated passenger
    $stmt = $con->prepare("
        SELECT r.id, r.passenger_id, d.name as driver_name 
        FROM ride r
        JOIN driver d ON d.id = r.driver_id
        WHERE r.id = :rid AND r.driver_id = :did AND r.status IN ('accepted', 'arrived', 'started', 'begin')
        LIMIT 1
    ");
    $stmt->execute([':rid' => $rideId, ':did' => $user_id]);
    $ride = $stmt->fetch();

    if (!$ride) {
        printFailure('No active ride found matching request', 404);
        exit;
    }

    $passengerId = $ride['passenger_id'];
    $callerName = trim($ride['driver_name']);

    // 2. Query Node.js signaling server to establish session
    $url = (getenv('VOICE_CALL_SERVER_URL') ?: 'https://calls.intaleqapp.com') . '/sessions';
    $apiKey = getenv('VOICE_CALL_API_KEY') ?: '';

    $ch = curl_init($url);
    $payload = json_encode([
        'ride_id' => (string)$rideId,
        'driver_id' => (string)$user_id,
        'passenger_id' => (string)$passengerId
    ]);

    curl_setopt_array($ch, [
        CURLOPT_POST => true,
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_POSTFIELDS => $payload,
        CURLOPT_HTTPHEADER => [
            "x-api-key: $apiKey",
            "Content-Type: application/json"
        ],
        CURLOPT_TIMEOUT => 5,
        CURLOPT_SSL_VERIFYPEER => false
    ]);

    $result = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    curl_close($ch);

    if ($httpCode !== 200) {
        error_log("[driver_create_call_session.php] Signaling server session mapping failed: $result (HTTP $httpCode)");
        printFailure('Signaling server error', 502);
        exit;
    }

    $sessionData = json_decode($result, true);
    if (!isset($sessionData['session_id'])) {
        printFailure('Invalid response schema from signaling server');
        exit;
    }

    $sessionId = $sessionData['session_id'];

    // 3. Dispatch data-only FCM call trigger to Passenger
    $stmtToken = $con->prepare("
        SELECT token 
        FROM tokens 
        WHERE passengerID = :pid 
        ORDER BY id DESC 
        LIMIT 1
    ");
    $stmtToken->execute([':pid' => $passengerId]);
    $passengerTokenRow = $stmtToken->fetch();

    if ($passengerTokenRow && !empty($passengerTokenRow['token'])) {
        sendFcmNotification(
            $passengerTokenRow['token'],
            'Incoming Call',
            'Incoming WebRTC voice call',
            [
                'type' => 'incoming_call',
                'session_id' => (string)$sessionId,
                'caller_name' => $callerName,
                'caller_avatar' => '',
                'ride_id' => (string)$rideId
            ],
            'Call',
            'ding'
        );
    }

    printSuccess('Call session created successfully', [
        'session_id' => $sessionId,
        'expires_in' => $sessionData['expires_in'] ?? 60
    ]);

} catch (Throwable $e) {
    error_log("[driver_create_call_session.php] Critical exception: " . $e->getMessage());
    printFailure('Server error', 500);
}