<?php
/****************************************************
*	Geocode Class - Collection of geocoding Utilities
*
* 	Created By: Rick Hays
* 		  Date: 2011-09-12
*
*	 Revisions:
*	 2011-09-12  RLH  Added "straight_line_distance"
* 	 2011-09-12  RLH  Added "getLatLong"
* 	 2019-09-28  RLH  Added "getDistance"
*
*****************************************************/
require_once 'key.php';

class geocode
{
	/*******************************************************************************************************************
	 * straight_line_distance - Returns Straight Line distance between two sets of (LAT/LONGS)
	 *
	 * @param float  $lat1 - Latitude of Location #1
	 * @param float  $lon1 - Longitude of Location #1
	 * @param float  $lat2 - Latitude of Location #2
	 * @param float  $lon2 - Longitude of Location #2
	 * @param string $unit - Unit of measure [DEFAULT = statute miles] ('K'=kilometers, 'N'=nautical miles)
	 *
	 * @return float - returns the distance in the desired unit of measure.
	 */
	public function straight_line_distance($lat1, $lon1, $lat2, $lon2, $unit='')
	{
		$theta = $lon1 - $lon2;
		$dist = sin(deg2rad($lat1)) * sin(deg2rad($lat2)) +  cos(deg2rad($lat1)) * cos(deg2rad($lat2)) * cos(deg2rad($theta));
		$dist = acos($dist);
		$dist = rad2deg($dist);
		$miles = $dist * 60 * 1.1515;
		$unit = strtoupper($unit);
		if ($unit == "K") { return ($miles * 1.609344); }       // Return in Kilometers
		else if ($unit == "N") { return ($miles * 0.8684); }    // Return in Nautical Miles
		else { return $miles; }                                 // Return in Miles
	}

	/*******************************************************************************************************************
	 * getLatLong - Converts a string with a street address into Lat/Long coordinates using a Google call.
	 *
	 * @param string $address - Text address to convert.
	 *
	 * @return array
	 */
	public function getLatLong($address)
	{
		if (!is_string($address))die("All Addresses must be passed as a string");
		$_url = sprintf('https://maps.googleapis.com/maps/api/geocode/json?address=%s&'.API_KEY,rawurlencode($address));
		if($_result = file_get_contents($_url))
		{
			$decode = json_decode($_result,true);
			$_coords['status'] = $decode['status'];
			$_coords['lat']    = $decode['results'][0]['geometry']['location']['lat'];
			$_coords['lon']    = $decode['results'][0]['geometry']['location']['lng'];
			return $_coords;
		}else die('Nothing was returned');

	}

	/*******************************************************************************************************************
	 * @param        $origin
	 * @param        $destination
	 * @param string $mode  (driving, walking, bicycling)
	 * @param string $units (metric, imperial)
	 *
	 * @return array
	 * @example - https://maps.googleapis.com/maps/api/distancematrix/json?'.$this->api_key.'&origins='.rawurlencode($origin).'&destinations='.rawurlencode($destination).'&mode=driving&units=imperial&sensor=false
	 *
	 */
	public function getDistance($origin, $destination, $mode='driving', $unit='imperial')
	{
		// Set defaults to test for
		$modes = array('driving', 'walking', 'bicycling');
		$units = array('metric', 'imperial');

		// Test that addresses are present
		if (!is_string($origin) || !is_string($destination))die("All Addresses must be passed as a string");

		// Test that Mode is present and of correct value
		$mode = strtolower($mode);
		if (!in_array($mode, $modes))die("Mode not correct");

		// Test that Unit is present and of correct value
		$unit = strtolower($unit);
		if (!in_array($unit, $units))die("Unit not correct");

		// Prep string for send ie(remove spaces and other objects)
		$_origin      = rawurlencode($origin);
		$_destination = rawurlencode($destination);
		$_mode        = rawurlencode($mode);
		$_unit        = rawurlencode($unit);

		$_url = sprintf('https://maps.googleapis.com/maps/api/distancematrix/json?%s&origins=%s&destinations=%s&mode=%s&units=%s&sensor=false',API_KEY, $_origin, $_destination, $_mode, $_unit);
		if($_result = file_get_contents($_url))
		{
			$decode = json_decode($_result,true);
			$_dist['status']   = $decode['status'];
			$_dist['distance'] = $decode['rows'][0]['elements'][0]['distance']['text'];
			$_dist['duration'] = $decode['rows'][0]['elements'][0]['duration']['text'];
			return $_dist;
		}else die('Nothing was returned');
	}

}   // End Class GEOCODE