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functions.php
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functions.php
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<?php
//converts CSV to JSON and adds headers as keys
function add_headers_to_json($filename) {
$file = fopen($filename, 'r');
$headers = fgetcsv($file, ',');
$csv_array = array();
while ($row = fgetcsv($file, ',')) {
$csv_array[] = array_combine($headers, $row);
}
fclose($file);
$json = json_encode($csv_array);
return $json;
}
//Locates user in the csv file
function find_user($userfile, $user) {
$user_sought = $user;
$users = json_decode(add_headers_to_json($userfile));
foreach ($users as $user) {
$userid = $user->id;
if ($user_sought == $userid) {
$current_user = $user;
}
}
if (isset($current_user)) {
return $current_user;
} else {
echo 'This user does not exist in our system, please try again.';
}
}
// Locates city by name and state in the csv file
function find_city_by_name($cityfile, $city_sought, $state_sought) {
$city_sought = str_replace("-", " ", $city_sought);
$cities = json_decode(add_headers_to_json($cityfile));
foreach ($cities as $city) {
$cityname = $city->name;
$statename = $city->state;
if (strtolower($city_sought) == strtolower($cityname) && strtoupper($state_sought) == $statename) {
$current_city = $city;
}
}
if (isset($current_city)) {
return $current_city;
} else {
echo '<strong>This city does not exist in our system, please try again.<br></strong>';
}
}
// Locates city by id
function find_city_by_id($cityfile, $city_sought_id) {
$cities = json_decode(add_headers_to_json($cityfile));
foreach ($cities as $city) {
$city_id = $city->id;
if ($city_sought_id == $city_id) {
$current_city = $city;
}
}
if (isset($current_city)) {
return $current_city;
} else {
echo '<strong>That city does not exist in our system, please try again. <br><a href="/flight_challenge/v1/users/'.$user.'/visits">Back</a></strong>';
}
}
// Locates all cities within a certain state
function get_states($file, $state_sought) {
if (isset($state_sought)) {
$cities = json_decode(add_headers_to_json($file));
$cities_in_states = array();
foreach($cities as $city) {
$state = $city->state;
if( strtoupper($state) == strtoupper($state_sought) ) {
array_push($cities_in_states, $city);
}
}
if (count($cities_in_states) > 0) {
//// For UI
// echo '<h1>Cities in '.$state_sought.':</h1>';
// foreach ($cities_in_states as $city) {
// echo '<h3>'.$city->id.'. '.$city->name.', '.$city->state.'</h3>';
// echo '<p>Location: '.$city->latitude.', '.$city->longitude.'</p><hr>';
// }
return $cities_in_states;
} else {
echo 'Please try again. Did you enter a US state abbreviation?';
}
} else {
echo 'Please try again. Did you enter a US state abbreviation?';
}
}
//finds cities within a certain distance of a start city
function find_distance($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 $nearby_cities;
}
// CURL to POST as JSON
function curl_post_json($user, $city, $state){
$city = str_replace("-", " ", $city);
if (isset($user) && isset($city) && isset($state)) {
$city_data = array(
'name' => $city,
'state' => strtoupper($state)
);
$ch = curl_init('http://localhost:8888/flight_challenge/v1/users/'.$user.'/visits');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($city_data));
$result = curl_exec($ch);
if($result === FALSE){
die(curl_error($curl_setup));
}
$response_city_data = json_decode($result, TRUE);
return $response_city_data;
}
}
//Adds new visit to CSV file
function write_to_visits($city_id, $user_id) {
//TODO: filter duplicate visits
$visit_id = count(file("visits.csv"));
$visited = $visit_id.",".$city_id.",".$user_id;
$file = fopen("visits.csv","a");
fputcsv($file, explode(',', $visited));
fclose($file);
}
// Reports back which cities the user has visited
function visited_cities($visitfile, $cityfile, $user_id) {
$visits = json_decode(add_headers_to_json($visitfile));
$visited_cities = array();
foreach ($visits as $visit) {
$visit_user_id = $visit->user_id;
if ($visit_user_id == $user_id) {
$visited_city_id = $visit->city_id;
$visited_city = find_city_by_id($cityfile, $visited_city_id);
$visited_cities[] = $visited_city;
}
}
if(count($visited_cities) > 0) {
echo '<h3>Your Visited Cities:</h3>';
foreach ($visited_cities as $visited_city) {
echo $visited_city->name.", ".$visited_city->state."<br>";
}
return $visited_cities;
} else {
echo 'It looks like you haven\'t visited any cities yet!';
}
}