<?php

// todo: unsure if can handle filenames that are URLs?
// handy constant to compute file size in megabytes

function fileSizeInMegs($filename) {
	$onemeg=1024*1024;
	$zipfilesize=filesize($filename);
	$zipfilesize=round($zipfilesize/$onemeg, 0);
	return $zipfilesize;
}

function fileSizeForDisplay($filename) {
	$onekilo=1024;
	$onemeg=$onekilo * $onekilo;
	$criteria = 10 * $onemeg;
	$scaleChar = "M";
	if (file_exists($filename)) {
      	$zipfilesize=filesize($filename);
      	if ($zipfilesize > $criteria) {
      		$zipfilesize=round($zipfilesize/$onemeg, 0);
      		$scaleChar = "M";
      	}
      	else {
      		$zipfilesize=round($zipfilesize/$onekilo, 0);
      		$scaleChar = "K";
      	}
  	} 
  	else {
  	   $zipfilesize = 0;
  	}
	$result =  "(" . $zipfilesize . $scaleChar . ")";
	return $result;
}


function displayFileLine($downloadprefix, $filename, $zipfilesize, $fileShortDescription) {
	echo "<td align=\"right\" valign=\"top\" width=\"30%\">";
	echo "<a href=\"$downloadprefix$filename\">" . $fileShortDescription . "</a>";
	echo "</td><td align=\"right\" valign=\"top\" width=\"3%\">";
	echo $zipfilesize;
	echo "</td>";
	echo "<td align=\"right\" valign=\"top\" width=\"2%\">";
	echo "[<a href=\"checksum/$filename.md5\">md5</a>]";
	echo "</td>";
}

function resourceExist($url, $mirrorPrefixuri, $prereqfilename, $eclipseFSpathPrefix)
{
	$result = false;

	$allowURLopen = ini_get('allow_url_fopen');

	if ($allowURLopen && stream_last_modified($url)) {
		$result = true;
	}
	else {
		// TODO: for now, we'll do a raw check on the whole file name, since enable_url_open
		// is off. better would be to check if we are on build.eclipse.org or download.eclipse.org?
    $wholePath = trim($eclipseFSpathPrefix) . "/" . trim($mirrorPrefixuri) . "/" . trim($prereqfilename);
    if (file_exists($wholePath)) {
    	$result = true;
    }
	}
	return $result;
}

function stream_last_modified($url)
{
	if (function_exists('version_compare') && version_compare(phpversion(), '4.3.0') > 0)
	{
		if (!($fp = @fopen($url, 'r')))
		return NULL;

		$meta = stream_get_meta_data($fp);
		for ($j = 0; isset($meta['wrapper_data'][$j]); $j++)
		{
			if (strstr(strtolower($meta['wrapper_data'][$j]), 'last-modified'))
			{
				$modtime = substr($meta['wrapper_data'][$j], 15);
				break;
			}
		}
		fclose($fp);
	}
	else
	{
		$parts = parse_url($url);
		$host  = $parts['host'];
		$path  = $parts['path'];

		if (!($fp = @fsockopen($host, 80)))
		return NULL;

		$req = "HEAD $path HTTP/1.0\r\nUser-Agent: PHP/".phpversion()."\r\nHost: $host:80\r\nAccept: */*\r\n\r\n";
		fputs($fp, $req);

		while (!feof($fp))
		{
			$str = fgets($fp, 4096);
			if (strstr(strtolower($str), 'last-modified'))
			{
				$modtime = substr($str, 15);
				break;
			}
		}
		fclose($fp);
	}
	return isset($modtime) ? strtotime($modtime) : time();
}

function isMirrored($uriToCheck) {
	global $debugScript;
	global $debugFunctions;
	$localuri = $uriToCheck;

	$debugMirrorList = false;
	if ($debugScript) {
		echo "uriToCheck: " . $localuri . "<br />";
	}

	$xmlcount = 0;

	/* This method true and accurate method of parsing mirror results
	 * may be expensive, and would
	 * likely cause artificially high counts of "downloads".
	 * Could maybe use if somehow only checked once ever 5 minutes or something.


	 // turn off warnings, as sometimes HTML is returned, which causes lots of warnings
	 $holdLevel = error_reporting(E_ERROR);
	 $mirrorsxml=simplexml_load_file(rawurlencode($localuri) . urlencode("&format=xml"));
	 error_reporting($holdLevel);


	 if ($mirrorsxml) {
	 if ($debugFunctions) {
	 echo "root node: " . $mirrorsxml->getName() . "<br />";
	 }
	 if (strcmp($mirrorsxml->getName(), "mirrors") == 0) {
	 foreach ($mirrorsxml->children() as $mirror) {
	 if (strcmp($mirror->getName(),"mirror") == 0) {
	 $xmlcount=$xmlcount+1;
	 }
	 if ($debugMirrorList) {
	 print_r($mirror);
	 echo "<br />";
	 }
	 }
	 }
	 if ($debugFunctions) {
	 echo "Mirror count: " . $xmlcount . "<br />";
	 }
	 }
	 */
	/*
	 * Use simple heuristic based on pattern
	 * in the URI ... if it contains "/downloads/" then assume it's mirrored
	 */
	if (strpos($uriToCheck, "webtools/downloads/") > 0) {
		$xmlcount = 1;
	}
	return ($xmlcount > 0);

}

// TODO: replace with Phoenix variables
function getPlatform () {
	global $debugScript;
	global $debugFunctions;
	// getBrowser is expensive, so cache the data
	static $browser;
	$platform = "unknown";


	if(ini_get("browscap")) {
		if(!isset($browser)){
			$browser = get_browser(null, true);
		}

		if ($browser) {
			$rawPlatform = $browser['platform'];
			if ($debugFunctions) {
				echo "browser platfrom: " . $rawPlatform . "<br />" ;
			}

			if ($debugFunctions) {
				$browserKeys = array_keys($browser);
				foreach ($browserKeys as $key) {
					echo $key . ": " . $browser[$key] . "<br />";
				}
			}
		}
		if (strpos($rawPlatform, "Win") === 0) {
			$platform="windows";
		} else if (strpos($rawPlatform, "Linux") === 0) {
			$platform="linux";
		} else if (strpos($rawPlatform, "Mac") === 0) {
			$platform="mac";
		}
	}
	return $platform;
}


function getPrereqReferenceOrName($eclipseMirrorScript, $mirrorPrefixuri, $prerequrl, $prereqfilename, $eclipseFSpathPrefix) {
	// todo: we really only need "if exists" so could make a bit more efficient
	// I tried "file_exists" but is didn't seem to work on my test server
	// For these pre-reqs, we assume if they exist, they are mirrored. This is true
	// 99% of the time.

	if (resourceExist($prerequrl, $mirrorPrefixuri, $prereqfilename, $eclipseFSpathPrefix)) {
		$reflink="<a href=\"" . $eclipseMirrorScript . $mirrorPrefixuri . "/" . $prereqfilename . "\">" . $prereqfilename . "</a>";
	} else {
		$reflink=$prereqfilename;
	}
	return $reflink;
}
?>