<?php
/*
 * Project wind_display
 * Description: An ambient display project. Displays the wind speed and
 * direction for cities reperesented by RFID tags
 * Authors: Matt Arlauckas and Trinh Le
 * RIT FETLAB (http://fetlab.rit.edu/)
 * Date: 2017-11-19
 */

// Core ID: use Photon core_id as unique ID
$core_id = $_REQUEST['coreid'];

// RFID Token ID:
$token_id = $_REQUEST['data'];

//  Add the core_id for Photons you'd like to allow to use this API
$allowedCores = array(
	'Your CoreID goes here'
);

// Locations Array
// Replace "TokenID n" with scanned token ID
// Replace "Cityn" with city associated with token ID
// Replace "Sn" with two-char state associated with city
$locations = array(
	"TokenID 1" => array("city" => "City1", "state" => "S1"),
	"TokenID 2" => array("city" => "City2", "state" => "S2"),
	"TokenID 3" => array("city" => "City3", "state" => "S3")
);

//  WeatherUnderground API Key
$wu_apikey = "Your WU API Key";

// check if core is allowed
if (in_array($core_id,$allowedCores)){
	echo getWindData($wu_apikey, $token_id, $locations);
} else {
	echo "API Key unknown. Access denied.";
}

function getWindData($apiKey, $tokenId, $location_array) {
	// get location city,state from locations array using token_id
	$state = $location_array[$tokenId]['state'];
	$city = $location_array[$tokenId]['city'];
	$wind_deg = 0;

	// query api using city, state, API key
	$postURL = "http://api.wunderground.com/api/".$apiKey."/conditions/q/".$state."/".$city.".json";
	$json = file_get_contents($postURL);
	$data = json_decode($json,true);

	// pull wind info from json response
	$wind_mph = $data['current_observation']['wind_mph'];
	$wind_dir = $data['current_observation']['wind_dir'];

	switch($wind_dir) {
		case 'North':
			$wind_deg = 0;
			break;
		case 'NNE':
			$wind_deg = 22;
			break;
		case 'NE':
			$wind_deg = 45;
			break;
		case 'ENE':
			$wind_deg = 67;
			break;
		case 'East':
			$wind_deg = 90;
			break;
		case 'ESE':
			$wind_deg = 112;
			break;
		case 'SE':
			$wind_deg = 135;
			break;
		case 'SSE':
			$wind_deg = 157;
			break;
		case 'South':
			$wind_deg = 180;
			break;
		case 'SSW':
			$wind_deg = 202;
			break;
		case 'SW':
			$wind_deg = 225;
			break;
		case 'WSW':
			$wind_deg = 247;
			break;
		case 'West':
			$wind_deg = 270;
			break;
		case 'WNW':
			$wind_deg = 292;
			break;
		case 'NW':
			$wind_deg = 315;
			break;
		case 'NNW':
			$wind_deg = 337;
			break;
	}

	$wind_data = array('wind_dir' => $wind_deg, 'wind_mph' => $wind_mph);

	// return wind array
	return json_encode($wind_data);
}
?>