<?php
	set_time_limit(0);
	error_reporting(-1);
	ini_set("display_errors",'On');
	ini_set('error_log','/tmp/wsn.log');
	$db = new PDO('pgsql:host=210.77.68.40;dbname=observation', "gis", "gispassword");

	$file=array();
	$basepath='/disk1/WestDC/wsndata/';

	//接收uuid，只生成这个对应的数据
	if($argc==2)
	{
		$uuid = $argv[1];
	}else{
		die("Error in parameter.");
	}

	$sql = "SELECT distinct ys.fld_site_id as site,si.fld_name from tbl_yuan_site ys left join tbl_site_info si on ys.fld_site_id=si.fld_site_id where ys.uuid='$uuid'";
	$rs = $db->query($sql);
	$sites = $rs->fetchAll();

	//先为该数据创建一个文件夹
	$datapath=$basepath.$uuid;
	if (!file_exists($datapath)) 
	{
		$result = mkdir($datapath);
	}

	
	//有需要生成的数据
	if($sites)
	{
		foreach($sites as $k=>$v )
		{
			//逐个site生成
			$site = $v['site'];
			//获取观测点的名称
			$sitename= $v['fld_name'];

			//在该文件夹下面再建立一个观测点文件夹
			$sitepath=$datapath.DIRECTORY_SEPARATOR.$sitename;
			if (!file_exists($sitepath)) 
			{
				$result = mkdir($sitepath);
			}				

			//获取变量名称
			$sql="select distinct va.fld_name from tbl_site_sensor_variable ssv left join tbl_variable_info va on ssv.fld_variable_id=va.fld_variable_id 
					WHERE ssv.fld_site_id=$site	order by va.fld_name";
			$sth=$db->query($sql);
			$rs=$sth->fetchAll();
			if (!$rs) continue;

			$head = "Time";
			$sql2= "select * from crosstab('SELECT v.fld_time as time,va.fld_name as variablename,v.fld_value as value
					FROM tbl_value v left join tbl_variable_info va on v.fld_variable_id=va.fld_variable_id
					WHERE v.fld_site_id=$site ORDER BY time',
					'select distinct va.fld_name from  tbl_variable_info va left join tbl_site_sensor_variable v on v.fld_variable_id=va.fld_variable_id
					WHERE v.fld_site_id=$site  order by va.fld_name')
					as ct(time timestamp without time zone";
			foreach($rs as $k=>$var)
			{
				$head.=", ".$var['fld_name'];
				$sql2.=",v".$k." real";
			}
			$head.="\n";
			$sql2.=")";
			
			//获取数据
			$sth2 = $db->query($sql2);
			$html="";
			$datastart=true;
			$start="";
			while ($v=$sth2->fetch())
			{
				//组装数据
				if ($datastart)
				{
					$start=$v['time'];
					$endtime=date("Y-m-d",strtotime($start)+24*3600);
					$datastart=false;
					$html="";
				}
				if ($v['time']>=$start && $v['time']<$endtime)
				{
					$html.=$v['time'];
					foreach ($rs as $k=>$var)
						$html.=",".$v['v'.$k];
					$html.="\n";
				} elseif ($v['time']>=$endtime) {
					//写入文件
					$resulttime=date("Ymd",strtotime($start));
					$fp = fopen($sitepath.DIRECTORY_SEPARATOR.$sitename.$resulttime.".CSV","w+"); 
					fwrite($fp,$head.$html); //写入数据
					fclose($fp); //关闭文件句柄
					$datastart=true;
				}					 
			}
			if (!$datastart)
			{
				//写入最后的文件
				$resulttime=date("Ymd",strtotime($start));
				$fp = fopen($sitepath.DIRECTORY_SEPARATOR.$sitename.$resulttime.".CSV","w+"); 
				fwrite($fp,$head.$html); //写入数据
				fclose($fp); //关闭文件句柄					
			}
			print $sitename."\r\n";
		}
	}