//Author Site：http://www.inote.tw/
//Author：海芋
var satelliteArrayCount = 0;
var showSatelliteImglength;
var satellite = new Array();
var satelliteCache = new Array(200);
var satelliteCacheNumber = 0;
var satelliteId;

function getSatelliteURL(picNumber, map)
{
	if(date) delete date;
	var date = new Date();
	var dYear = date.getFullYear();
	var dMonth = date.getMonth();
	var dDay = date.getDate();
	var dHour = date.getHours();
	var dMin = date.getMinutes();
	var picURL;
	var PostfixURL = ".jpg";
	var delayTime = 30;

	if (satelliteCacheNumber > 200)
		satelliteCacheNumber = 0;
		
	//依地區調整前置值與後置值
	if(map == 1)
	{
		picURL = "http://www.cma.gov.cn/tqyb/images/forecast/products/yuntu/l/sevp_nsmc_wxcl_asc_fff_achn_ffff_py_";
		PostfixURL = "fffff.jpg";
		document.getElementById("satellite").href="http://www.cma.gov.cn/tqyb/nephogram.html";
	}
	else if(map == 2)
	{
		picURL = "http://www.hko.gov.hk/wxinfo/intersat/mtsat_400/";
		PostfixURL = "30mtsat_7_36Ne.png";
		document.getElementById("satellite").href="http://www.hko.gov.hk/wxinfo/intersat/satpicc_s.shtml";
	}
	else
		document.getElementById("satellite").href="http://www.cwb.gov.tw/V6/observe/satellite/sat.htm#top";

	//依地區調整時間值
	if (map != 1)
	{
		date.setMinutes(date.getMinutes()- delayTime);
		delayTime = 60;
	}
	else
	{
		date.setMinutes(date.getMinutes()- 480);
		delayTime = 30;
		date.setMinutes(date.getMinutes()- delayTime);
	}
	
	//建構圖像陣列
	for(var i=0;i<picNumber;i++)
	{
		if (map == 1)
		{
			for (var j=0;j<2;j++)
			{
				picURL = "http://www.cma.gov.cn/tqyb/images/forecast/products/yuntu/l/sevp_nsmc_wxcl_asc_fff_achn_ffff_py_";
				dYear = date.getFullYear();
				dMonth = date.getMonth();
				dHour = date.getHours();
				dMin= date.getMinutes();
				dDay = date.getDate();
				// 修正時間
				if(dMin >= 30)
					dMin = "30";
				else
					dMin = "00"
				
				if (++dMonth < 10) dMonth = '0' + dMonth;
				if (dHour < 10) dHour = '0' + dHour;
				if (dDay < 10) dDay = '0' + dDay;
				picURL = picURL + dYear+ dMonth+ dDay+ dHour+ dMin + PostfixURL;
				
				satelliteCache[satelliteCacheNumber]= new Image();
				satelliteCache[satelliteCacheNumber++].src = picURL;
				satellite.push(picURL);
				date.setMinutes(date.getMinutes()- delayTime);
			}
		}
		else
		{
			dYear = date.getFullYear();
			dMonth = date.getMonth();
			dHour = date.getHours();
			dDay = date.getDate();
			
			//修正時間
			if (++dMonth < 10) dMonth = '0' + dMonth;
			if (dHour < 10) dHour = '0' + dHour;
			if (dDay < 10) dDay = '0' + dDay;
			
			//日期
			if (map == 2)
			{
				picURL = "http://www.hko.gov.hk/wxinfo/intersat/mtsat_400/";
				dMin="01";
				picURL += "" + dYear + dMonth + dDay + dHour + dMin + "+";
				date.setMinutes(date.getMinutes()- 540);
				
				//再次取得時間
				dHour = date.getHours();
				dDay = date.getDate();
				
				//再次修正時間
				if (dHour < 10) dHour = '0' + dHour;
				if (dDay < 10) dDay = '0' + dDay;
				
				//最終網址
				picURL += "" + dDay + dHour + PostfixURL;
				
				//加回時間
				date.setMinutes(date.getMinutes()+ 540);
			}
			else
			{
				//http://www.cwb.gov.tw/V5/observe/satellite/Data/s1p/s1p-2008-10-15-18-00.jpg
				picURL = "http://www.cwb.gov.tw/V6/observe/satellite/Data/";
				
				if(map == 0)
					picURL += "s3p/s3p-";
				else if(map == 3)
					picURL += "s1p/s1p-";
				else
					picURL += "s0p/s0p-";
				picURL += "" + dYear + "-" + dMonth + "-" + dDay + "-" + dHour + "-00"+PostfixURL;
			}
			satelliteCache[satelliteCacheNumber] = new Image();
			satelliteCache[satelliteCacheNumber++].src = picURL;
			satellite.push(picURL);
			
			//更改時間
			date.setMinutes(date.getMinutes()- delayTime);
		}
	}

	//秀衛星圖
	if (picNumber == 1)
		document.images.picSatellite.src = satellite.pop();
	else
	{
		satelliteArrayCount = 0;
		satelliteId = setTimeout("showSatelliteImg()",1000);
	}
}
function showSatelliteImg()
{
	showSatelliteImglength = satellite.length-1;
	satelliteArrayCount--;
	if (!(satelliteArrayCount+1)) 
		satelliteArrayCount = showSatelliteImglength;
	document.images.picSatellite.src=satellite[satelliteArrayCount];
	satelliteId = setTimeout("showSatelliteImg()",1000);
}

function StopSatellite(picNumber,map)
{
	//清除之前衛星的資料
	var satelliteChoice;
	for (var i = 0; i <satelliteCacheNumber; i++)
	{
		if(satelliteCache[satelliteCacheNumber])
		delete satelliteCache[satelliteCacheNumber];
	}
	while (satellite.pop());
	
	if (isNaN(map))
	{
		satelliteChoice = document.getElementsByName(map);
		for(var i=0;i<satelliteChoice.length;i++)
		{
			if(satelliteChoice[i].checked)
				map = satelliteChoice[i].value;
		}
	}
	
	if(satelliteId)
		clearTimeout(satelliteId);
	
	if(isNaN(picNumber))
		picNumber = 12;
	else
	{
		if (picNumber > 48) picNumber = 48;
		else if(picNumber <=0) picNumber = 12;
	}
	getSatelliteURL(picNumber,map);
}