<?php
/**
 * get_surge_heatmap.php
 * يزود تطبيق الكابتن بأماكن الذروة وفرص الطلب الحالية
 */

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

// Authentication happens in connect.php (JWT check)
if (!isset($user_id) || $role !== 'driver') {
    http_response_code(403);
    echo json_encode(['status' => 'failure', 'message' => 'Unauthorized']);
    exit;
}

try {
    $countryCode = filterRequest('country_code');
    if (!$countryCode) {
        $countryCode = 'SY'; // Fallback
    }

    $surgeKey = "surge:opportunities:{$countryCode}";
    $hotspotsJson = $redis->get($surgeKey);
    $hotspots = $hotspotsJson ? json_decode($hotspotsJson, true) : [];
    
    $driverHeatmap = [];
    
    if (!empty($hotspots)) {
        foreach ($hotspots as $grid => $multiplier) {
            // Only show grids with a meaningful multiplier > 1.05
            if ($multiplier > 1.05) {
                list($lat, $lng) = explode('_', $grid);
                $driverHeatmap[] = [
                    'lat' => (float)$lat,
                    'lng' => (float)$lng,
                    'surge_multiplier' => (float)$multiplier,
                    'radius_meters' => 1500 // 1.5km grid box
                ];
            }
        }
    }

    jsonSuccess([
        'status' => 'success',
        'message' => 'Surge heatmap data fetched',
        'hotspots' => $driverHeatmap
    ]);

} catch (Exception $e) {
    error_log("[get_surge_heatmap] Error: " . $e->getMessage());
    jsonError("Failed to fetch heatmap");
}