<?php
header('Content-Type: application/json; charset=utf-8');
require_once __DIR__ . '/../../connect.php'; 

// Optional filter: days
$days = filterRequest('days') ?? 7; 

try {
    $sql = "SELECT latitude, longitude, source, created_at 
            FROM passenger_opening_locations 
            WHERE created_at >= DATE_SUB(NOW(), INTERVAL :days DAY)
            ORDER BY created_at DESC LIMIT 5000"; // Limit to prevent massive payloads

    $stmt = $con->prepare($sql);
    $stmt->bindValue(':days', (int) $days, PDO::PARAM_INT);
    $stmt->execute();

    $locations = $stmt->fetchAll(PDO::FETCH_ASSOC);

    echo json_encode([
        "status" => "success",
        "data" => $locations
    ]);

} catch (Exception $e) {
    error_log("Error fetching heatmap data: " . $e->getMessage());
    echo json_encode(["status" => "error", "message" => "Server error"]);
}
?>