<?php

$files = explode("\n", `find code/data -type f`);
array_pop($files); //last element is empty

foreach ($files as $file) {
	// skip some bytes in the preamble to save space:
	// ID (4 bytes): skip
	// BC flag (1 byte): keep
	// country code (2 bytes): keep
	// the rest (13 bytes): skip

	$TZ = str_replace('code/data/', '', $file);
	$x = `php create-entry.php $TZ`;
	$y = substr($x, 4, 3) . substr($x, 4+3+13);

	$data[$TZ] = $y;
}

unset($files, $x, $y);

// ordering by size improves chances of getting duplicates
uasort($data, 'sort_by_size');

$file = '';

foreach ($data as $TZ => $entry) {
	$idx = strpos($file, $entry);

	if ($idx === false) {
		$idx  = strlen($file);
		$file .= $entry;
	}

	$offsets[$TZ] = $idx;
}


// now output the result
unset($data, $idx);
uksort($offsets, 'strcasecmp');

echo "/* This is a generated file, do not modify */\n\n";
echo "static const timelib_tzdb_index_entry timezonedb_idx_builtin[".sizeof($offsets)."] = {\n";

foreach ($offsets as $TZ => $offset) {
	echo "\t{ ".sprintf('%-36s, 0x%06X', '"'.$TZ.'"', $offset). " },\n";
}

echo "};\n";

echo "\nstatic const unsigned char timelib_timezone_db_data_builtin[".strlen($file)."] = {\n";

$size = strlen($file);
for ($i = 0; $i < $size; ++$i) {
	printf("0x%02X, ", ord($file[$i]));
	if ($i % 16 == 15) {
		echo "\n";
	}
}

echo "};\n\n";


function sort_by_size($a, $b)
{
	$sa = strlen($a);
	$sb = strlen($b);

	if ($sa > $sb) return -1;
	if ($sa < $sb) return 1;
	return 0;
}