<?php
	$months = array(
		'January' =>	'01',
		'February' =>	'02',
		'March' =>		'03',
		'April' =>		'04',
		'May' =>		'05',
		'June' =>		'06',
		'July' =>		'07',
		'August' =>		'08',
		'September' =>	'09',
		'October' =>	'10',
		'November' =>	'11',
		'December' =>	'12');
	
	$os_groups = array('Windows', 'Mac', 'Linux', 'Other device',
		'iPhone/iPod', 'Windows CE', 'Symbian', 'Android', 'BlackBerry', 'Other handheld');
	
	$os_list = array(
		'Windows' =>						'Windows',
		'Windows Vista'	=>					'Windows',
		'Windows XP' =>						'Windows',
		'Windows XP 64-bit Edition' =>		'Windows',
		'Windows 2000' =>					'Windows',
		'Windows ME' =>						'Windows',
		'Windows 98' =>						'Windows',
		'Windows 95' =>						'Windows',
		'Windows NT' =>						'Windows',
		'Windows 7' =>						'Windows',
		'Win64' =>							'Windows',
		'MacIntel' =>						'Mac',
		'Mac OS' =>							'Mac',
		'Mac OS X 10.4' =>					'Mac',
		'Mac OS X 10.5' =>					'Mac',
		'Mac OS X Mach-O' =>				'Mac',
		'Mac OS X (no version reported)' =>	'Mac',
		'MacPPC=/conditioning_book.html' =>	'Mac',
		'Linux' =>							'Linux',
		'Web TV' =>							'Other device',
		'SunOS sun4u' =>					'Other device',
		'FreeBSD' =>						'Other device',
		'FreeBSD i386' =>					'Other device',
		'OS/2' =>							'Other device',
		'SunOS' =>							'Other device',
		'SunOS5.5.1' =>						'Other device',
		'FreeBSD i386 X11' =>				'Other device',
		'Nintendo Wii' =>					'Other device',
		'PLAYSTATION 3' =>					'Other device',
		'Pike' =>							'Other device',
		'Pike v7.6 release 92' =>			'Other device',
		'Java ME' =>						'Other device',
		'Unknown' =>						'Other device',
		'iPhone' =>							'iPhone/iPod',
		'iPod' =>							'iPhone/iPod',
		'Windows CE' =>						'Windows CE',
		'Symbian' =>						'Symbian',
		'Symbian OS' =>						'Symbian',
		'Series60' =>						'Symbian',
		'Android 1.0' =>					'Android',
		'Android 1.1' =>					'Android',
		'Android 1.5' =>					'Android',
		'PSP' =>							'Other handheld',
		'Hiptop' =>							'Other handheld',
		'PalmOS' =>							'Other handheld',
		'BlackBerry' =>						'BlackBerry');
	
	echo 'Downloading and grouping market share data...';
	for ($i=72; $i<144; $i++) { // from January 2005 to December 2010
		$xml = new DOMDocument();
		$xml->load("http://marketshare.hitslink.com/report.aspx?qprid=10&qptimeframe=M&qpsp=$i&qpmr=30&qpdt=1&qpct=3&qpf=13");
		$date = explode(', ', $xml->getElementsByTagName('timeframe')->item(0)->nodeValue);
		$month = $date[1] . '-' . $months[$date[0]];
		$rows = $xml->getElementsByTagName('row');
		if ($rows->length == 0) break;
		for ($j=0; $j<$rows->length; $j++) {
			$os = $rows->item($j)->getElementsByTagName('value1')->item(0)->nodeValue;
			$share = trim($rows->item($j)->getElementsByTagName('value2')->item(0)->nodeValue, '%');
			if ($share == 0)
				continue;
			if (!isset($os_list[$os]))
				exit("Unknown operating system: $os\n");
			if (isset($ms[$month][$os_list[$os]]))
				$ms[$month][$os_list[$os]] += $share;
			else
				$ms[$month][$os_list[$os]] = $share;
		}
	}
	$fp = fopen('market-shares.txt', 'w');
	fwrite($fp, "Month\t" . implode("\t", $os_groups) . "\n");
	foreach ($ms as $month => $values) {
		fwrite($fp, $month);
		foreach ($os_groups as $os)
			if (isset($values[$os]))
				fwrite($fp, "\t" . sprintf("%.2f", $values[$os]));
			else
				fwrite($fp, "\t0.00");
		fwrite($fp, "\n");
	}
	fclose($fp);
	echo "\nDone.\n";
?>