$current_city = find_city_by_id('cities.csv', $city);
} else {
$current_city = find_city_by_name('cities.csv', $city, $state);
}
if (isset($current_city)) {
$cityname = $current_city->name;
$radius = Flight::request()->query->radius;
$nearby = find_distance($state, $cityname, $radius, 'cities.csv');
Flight::json($nearby);
}
});
// Allow users to mark visits to a city
Flight::route('POST /v1/users/@user/visits', function ($user) {
$city = Flight::request()->data->name;
$state = Flight::request()->data->state;
$current_city = find_city_by_name('cities.csv', $city, $state);
if (isset($current_city)) {
$city_id = $current_city->id;
write_to_visits($user, $city_id);
}
});
// Allows users to see visited cities and enter new visited cities as a query
Flight::route('GET /v1/users/@user/visits', function ($user) {
$current_user = find_user('users.csv', $user);
if (isset($current_user)) {
$user_id = $current_user->id;
// While I was developing, I used a form for the ease of UI in order to send to the POST.
// echo '<form action="/flight_challenge/v1/users/'.$user_id.'/visits" method="POST">
// City: <input type="text" name="name"><br>
// State: <input type="text" name="state"><br>
// <input type="submit" value="Submit">
function find_distance($start_state, $start_city, $radius, $cityfile)
{
$cities = json_decode(add_headers_to_json($cityfile));
$start_city = str_replace("-", " ", $start_city);
$start_city = find_city_by_name($cityfile, $start_city, $start_state);
$nearby_cities = array();
$lon1 = deg2rad($start_city->longitude);
// convert from degrees to radians
$lat1 = deg2rad($start_city->latitude);
$earth_radius = 3959;
//in miles
foreach ($cities as $city) {
$lon2 = deg2rad($city->longitude);
$lat2 = deg2rad($city->latitude);
//determine difference
$latDelta = $lat1 - $lat2;
$lonDelta = $lon1 - $lon2;
//Vicenty formula
$lonDelta = $lon1 - $lon2;
$a = pow(cos($lat1) * sin($lonDelta), 2) + pow(cos($lat2) * sin($lat1) - sin($lat2) * cos($lat1) * cos($lonDelta), 2);
$b = sin($lat2) * sin($lat1) + cos($lat2) * cos($lat1) * cos($lonDelta);
$angle = atan2(sqrt($a), $b);
$distance = $angle * $earth_radius;
if ($distance <= $radius && $distance != 0) {
// for UI
// echo $city->name.", ".$city->state.': '.$distance.' miles away<br>';
$nearby_cities[] = $city;
}
}
return $nearby_cities;
}
