<?php
namespace Jiaruan;

class Jytgps {
			

	public static function str2bin( $text ){
		if (!is_string($text)) 
			return null;
		$arr = explode(' ',$text);
		$bin = '';
		foreach($arr as $hex){
			if(strlen($hex) == 2){
				$bin .= chr( hexdec($hex) );
			}
		}
		return $bin;
	}
	
 
	public static function input( $buffer, $connection ){
		$end = substr($buffer,-1);
		if($end != '#'){
			return 0;
		}
		return strlen($buffer);
	}
	
 
	public static function encode( $value ){
		echo 'encode:'.PHP_EOL;
		var_dump($value);
		
		return $value['head_char'].$value['identify'].$value['version'].'Y'.$value['function_code'].$value['function_keyword'].$value['end_char'];
		
	}
	
 
	public static function decode( $buffer ){
		$length = strlen($buffer);
		$data = array();
		$data['head_char'] = substr($buffer,0,1);
		$data['identify'] = substr($buffer,1,2);
		$data['version'] = substr($buffer,3,2);
		$data['replay'] = substr($buffer,5,1);
		$index = strpos($buffer,',')+1;
		$data['device_id'] = substr($buffer,6,$index-1-6);
		$re = substr($buffer,$index,1);
		if($re == 'Y'){
			$data['function_code'] = substr($buffer,$index+1,1);
			$data['function_keyword'] = substr($buffer,$index+2,1);
			$data['end_char'] = substr($buffer,$index+3,1);
		}else{
			$data['function_code'] = substr($buffer,$index,1);
			$data['function_keyword'] = substr($buffer,$index+1,1);
			$order_data = substr($buffer,$index+2,$length-1);
			$data['order_data'] = $order_data;
			$data['end_char'] = substr($buffer,-1);
			//解析指令数据
			/*
			function_code(终端--功能类指令): A-上传状态类信息  B-上传定位类信息
			function_keyword(功能项):
			*/
			$data['method'] = 'method000'.$data['function_code'];
			$data['packet'] = $buffer;
			if($data['function_code'] == 'B'&& $data['function_keyword'] == 'A'){
				
				$orders = explode('&',$order_data);
				foreach ($orders as $order) {
					if($order){
						$code = substr($order,0,1);
						//解析定位数据
						if($code=='A'){
							//A0732142233550011405829060520190600
							//时分秒
							$times = substr($order,1,2).':'.substr($order,3,2).':'.substr($order,5,2); 
							//定位纠偏  纠偏公式   abcde.fghi    abc+de/60+fghi/600000
							$lat1 = substr($order,7,4);
							$lat2 = substr($order,11,4);
							$lat_a = floor($lat1/100);
							$lat_b = (($lat1 - $lat_a*100).'.'.$lat2 )/60;
							$lat = $lat_a + $lat_b;
		
							$lng1 = substr($order,15,5);
							$lng2 = substr($order,20,4);
							$lng_a = floor($lng1/100);
							$lng_b = (($lng1 - $lng_a*100).'.'.$lng2 )/60;
							$lng = $lng_a + $lng_b;
							$data['lat'] = $lat;
							$data['lng'] = $lng;
							/*
								$lat_0 =  substr($order,7,4).'.'.substr($order,11,4);
								$lng_0 =  substr($order,15,5).'.'.substr($order,20,4);
								$data['lat_0'] = $lat_0;
								$data['lng_0'] = $lng_0;
								*/
							$f = ord(substr($order,24,1));
							$data['f'] = $f;
							$data['type'] = 1;//1-表示取GPS坐标数据,2-表示取基站坐标
							switch ($f) {
								case 48://0x0011 0000 西经、南纬、定位
								$data['ew']='W';
								$data['ns']='S';
								$data['location']=true;
								break;
								case 49://0x0011 0001 西经、南纬、非定位
								$data['ew']='W';
								$data['ns']='S';
								$data['location']=false;
								break;
								case 50://0x0011 0010 西经、北纬、定位
								$data['ew']='W';
								$data['ns']='N';
								$data['location']=true;
								break;
								case 51://0x0011 0011 西经、北纬、非定位
								$data['ew']='W';
								$data['ns']='N';
								$data['location']=false;
								break;
								case 52://0x0011 0100 东经、南纬、定位
								$data['ew']='E';
								$data['ns']='S';
								$data['location']=true;
								break;
								case 53://0x0011 0101东经、南纬、非定位
								$data['ew']='E';
								$data['ns']='S';
								$data['location']=false;
								break;
								case 54://0x0011 0110东经、北纬、定位
								$data['ew']='E';
								$data['ns']='N';
								$data['location']=true;
								break;
								case 55://0x0011 0111 东经、北纬、非定位
								$data['ew']='E';
								$data['ns']='N';
								$data['location']=false;
								break;
								case 63://0x0011 1111 表示设备直接调用第三方的基站位置解析接口成经纬度信息上传，该标志位用来区分正常的GPS 定位经纬度信息
								$data['ew']=null;
								$data['ns']=null;
								$data['type']=2;
								break;
		
								default:
								break;
							}
		
							$data['speed'] = substr($order,25,2);
							$data['direction'] = substr($order,27,2);
							$dates = '20'.substr($order,33,2).'-'.substr($order,31,2).'-'.substr($order,29,2); //年月日
							$data['device_time'] = $dates.' '.$times;
						}
					}
				}
				
		
			}
		}
		
		return $data;
	}
	
 
	public static function bin2str( $hex, $space ){
		$data = unpack("C*chars",$hex);
		$bin = '';
		foreach($data as $key=>$value){
			$bin .= sprintf('%02X',$value);
			if($space)
				$bin .= ' ';
		}
		return trim($bin);
	}
	

}