<?php
	/**
	 * RX2 - Main API to process in coming request for closest location.
	 * 2019-09-29
	 * Rick Hays
	 *
	 */

	include_once 'assets/classes/geocode.php';

	// See if we are in test mode //////////////////////////////////////////////////////////////////////////////////////
	$TEST = GetParam('T', 0);
	////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

	// Test Key before allowing access - No encryption, simple key test.
	$key = strtoupper(GetParam('K'));
	if ($key !== 'RLH4321')
	{
		$result['status'] = 'ERROR';
		$result['code'] = '100';
		$result['description'] = 'Bad Key Code.';
		$jsonOut =  json_encode($result);
	}
	else
	{
		$request_method = strtoupper($_SERVER["REQUEST_METHOD"]);
		$command = strtoupper(GetParam('C'));
		$address = rawurldecode(GetParam('address')) . '';
		switch ($request_method)
		{
			case 'GET':
				switch ($command)
				{
					case 'LL':
						if ($address === '')
						{
							$aOutput = array
							(
								'status' => 'ERROR',
								'code' => '101',
								'description' => 'No Address present.',
							);
							$jsonOut = json_encode($aOutput);
							break;
						}   // if ($address === '')
						$geo = new geocode();
						$latlon = $geo->getLatLong($address);
						$jsonOut = json_encode($latlon);
						$geo = NULL;
						break;
					case 'DIST':
						if ($address === '')
						{
							$aOutput = array
							(
								'status' => 'ERROR',
								'code' => '101',
								'description' => 'No Address present.',
							);
							$jsonOut = json_encode($aOutput);
							break;
						}   // if ($address === '')
						$geo = new geocode();
						$db = new PDO('sqlite:assets/db/RX.db');
						$latlon = $geo->getLatLong($address);
						if ($latlon['status'] === 'OK')
						{
							$shortest = 999999.99;                // <-- Sets to a very high value to find shortest distance below.
							$pharmacies = $db->query('SELECT rowid,* FROM pharmacies');
							$SKIP = 0;  // Part of test mode to skip all but one record in DB
							foreach ($pharmacies as $pharmacy)
							{
								$destination = $pharmacy['Address'] . ' ' . $pharmacy['City'] . ' ' . $pharmacy['State'] . ' ' . $pharmacy['Zip'];
								if ($SKIP === 0) $result = $geo->getDistance($address, $destination);
								if ($TEST == 1) $SKIP = 1;
								if ($result['status'] === 'OK')
								{
									$distance = floatval(preg_replace('/[^0-9.]/', '', $result['distance']));
									if ($distance < $shortest)
									{
										$aOutput = array
										(
											'pharmacy' => $pharmacy['Pharmacy'],
											'address' => $pharmacy['Address'],
											'city' => $pharmacy['City'],
											'state' => $pharmacy['State'],
											'zip' => $pharmacy['Zip'],
											'latitude' => $pharmacy['Latitude'],
											'longitude' => $pharmacy['Longitude'],
											'home_lat' => $latlon['lat'],
											'home_lon' => $latlon['lon'],
											'status' => $result['status'],
											'distance' => $result['distance'],
											'duration' => $result['duration'],
										);
										$shortest = $distance;
									}   // if ($result['distance'] < $shortest)
								}   // if ($result['status'] === 'OK')
								else
								{
									$aOutput = array
									(
										'status' => 'ERROR',
										'code' => '104',
										'description' => "Problem returning distance between address and pharmacy.\nAddress: " . $address . "\nPharmacy( ROWID: " . $pharmacy['rowid'] . " Name: " . $pharmacy['Pharmacy'] . ') ',
									);
									$jsonOut = json_encode($aOutput);
									break;
								}   //else  ($result['status'] === 'OK')
							}   // foreach ($pharmacies as $pharmacy)
						}   // if ($latlon['status'] === 'OK')
						else
						{
							$aOutput = array
							(
								'status' => 'ERROR',
								'code' => '103',
								'description' => "Problem returning Lat / Lon.\nAddress: " . $address,
							);
							$jsonOut = json_encode($aOutput);
							break;

						}   // else ($latlon['status'] === 'OK')
						$jsonOut = json_encode($aOutput);
						$db = NULL;
						$geo = NULL;
						break;

					default:
						$aOutput = array
						(
							'status' => 'ERROR',
							'code' => '102',
							'description' => "Invalid Command sent - " . $command,
						);
						$jsonOut = json_encode($aOutput);
						break;

				}   // switch ($command)
				break;

//		case 'POST':
//			break;
//
//		case 'PUT':
//			break;
//
//		case 'DELETE':
//			break;
//
			default:
				// Invalid Request Method
				header("HTTP/1.0 405 Method Not Allowed");
				exit;

		}   // switch ($request_method)
	}   // else ($key !== 'RLH4321')
	echo $jsonOut;

// ##### END OF PROGRAM ################################################################################################

	/**
	 * GetParam - Returns the GET or POST values, and allows for defaults if not present.
	 * @param      $param_name
	 * @param null $default
	 *
	 * @return string|null
	 */
	function GetParam($param_name, $default=NULL)
	{
		global $_POST;
		global $_GET;
		$param_value = "";

		if(isset($_POST[$param_name]))
			$param_value = $_POST[$param_name];
		else if(isset($_GET[$param_name]))
			$param_value = $_GET[$param_name];
		else if($param_value === '')
			$param_value = $default;

		return $param_value;
	}