#!/usr/bin/env php
<?php

// Send all errors to stderr
ini_set('display_errors', 'stderr');

// setup composer autoloading
$composerAutoload = [
	__DIR__ . '/../vendor/autoload.php', // standalone with "composer install" run
	__DIR__ . '/../../../autoload.php', // script is installed as a composer binary
];
foreach ($composerAutoload as $autoload) {
	if (file_exists($autoload)) {
		require($autoload);
		break;
	}
}

if (!class_exists('cebe\jssearch\Indexer')) {
	error('Autoloading does not seem to work. Looks like you should run `composer install` first.');
}

// check arguments
$src = [];
foreach($argv as $k => $arg) {
	if ($k == 0) {
		continue;
	}
	if ($arg[0] == '-') {
		$arg = explode('=', $arg);
		switch($arg[0]) {
			// TODO allow baseUrl to be set via arg
			case '-h':
			case '--help':
				echo "jssearch index builder\n";
				echo "----------------------\n\n";
				echo "by Carsten Brandt <mail@cebe.cc>\n\n";
				usage();
				break;
			default:
				error("Unknown argument " . $arg[0], "usage");
		}
	} else {
		$src[] = $arg;
	}
}

if (empty($src)) {
	error("You have to give an input directory.", "usage");
}

$indexer = new \cebe\jssearch\Indexer();

foreach($src as $dir) {
	echo "Processing $dir\n";
	$files = findFiles($dir);

	if (empty($files)) {
		echo "No files where found in $dir.\n";
	} else {
		$indexer->indexFiles($files, $dir);
	}
}

$js = $indexer->exportJs();
file_put_contents('jssearch.index.js', $js);


// functions

/**
 * Display usage information
 */
function usage() {
	global $argv;
	$cmd = $argv[0];
	echo <<<EOF
Usage:
    $cmd [src-directory]

    --help    shows this usage information.

    creates and jssearch.index.js file in the current directory.

EOF;
	exit(1);
}

/**
 * Send custom error message to stderr
 * @param $message string
 * @param $callback mixed called before script exit
 * @return void
 */
function error($message, $callback = null) {
	$fe = fopen("php://stderr", "w");
	fwrite($fe, "Error: " . $message . "\n");

	if (is_callable($callback)) {
		call_user_func($callback);
	}

	exit(1);
}

function findFiles($dir, $ext = '.html')
{
	if (!is_dir($dir)) {
		error("$dir is not a directory.");
	}
	$dir = rtrim($dir, DIRECTORY_SEPARATOR);
	$list = [];
	$handle = opendir($dir);
	if ($handle === false) {
		error('Unable to open directory: ' . $dir);
	}
	while (($file = readdir($handle)) !== false) {
		if ($file === '.' || $file === '..') {
			continue;
		}
		$path = $dir . DIRECTORY_SEPARATOR . $file;
		if (is_file($path)) {
			if (substr($file, -($l = strlen($ext)), $l) === $ext) {
				$list[] = $path;
			}
		} else {
			$list = array_merge($list, findFiles($path, $ext));
		}
	}
	closedir($handle);

	return $list;
}