<?php

if(isset($_GET['hash']))
    die(getHash($_GET['hash']));

//define("DEBUG", $_SERVER["HTTP_HOST"] == "localhost");
define("DEBUG", false);
define("SHORT", "short");
define("LONG", "long");
define("AJAX", false);

$CURRENT_URI = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

function tryPOSTGET($index) {
	if(isset($_POST[$index])) return $_POST[$index];
	if(isset($_GET[$index]))  return $_GET[$index];
	else return "";
}

$year = getSchoolYear();
$school   = tryPOSTGET('school');
$election = tryPOSTGET('election'); // superlatives, council, homecoming
$action   = tryPOSTGET('action'); // admin, cast_votes, login, restart, view, vote
$detail   = tryPOSTGET('detail'); // status

$VOTABLES = array('superlatives', 'homecoming', 'council');

// Since we use the $election to do things like select which SQL table to use,
// we MUST ensure that we not allow the variable to be any random garbage string!
if(!(empty($election) || in_array($election, $VOTABLES))) {
    var_dump($election);
    exit;
    redirect_to(dirname($CURRENT_URI));
    exit;
}

// $prefix most likely to be directory corresponding to school name,
// e.g. "brandywine" or "concord" (in which data files are stored)
function getSchoolYear() {
    $year =tryPOSTGET('year');
    if($year != '') return $year;

    if(!isset($prefix)) $prefix = "."; // current directory

    $fall_year = $spring_year = intval(date("Y"));

    if( intval(date("n")) < 6 ) { // month is between jan. and may
        $fall_year = ($spring_year - 1);
    } else { // from june to december,
        $spring_year = ($fall_year + 1);
    }

    return "$fall_year-$spring_year";
}

if(!empty($school)) {
	$schoolYear = "$school/$year"; // $school comes from dispatch.php
	$config_file = "schools/$schoolYear/config.ini";
	if(!is_readable($config_file))
		die("no data for year $year, email < web a t eschew.org > if this is wrong");

	require_once("schools/$schoolYear/config.php"); // exports $elections
}
//
// A hash is used to keep the student_id itself secret and ensure that
//	the student_id is not used directly for the vote booths
function getHash($student_id) {
	return sprintf("%u", crc32($student_id));
}

// Fetches a short or long human-friendly school name from per-year config file
// If the given school does not have anything set up for the current $year,
// then this returns $schoolNameDefault.
function schoolName($form = SHORT, $school = false) {
        $file = null;
	if($school) { global $year;
		$file = "schools/$school/$year/config.ini";
	}
	return config("{$form}name", "", $file);
}

// config("superlatives/votes"); attempts to get config_ini()['superlatives']['votes'];
// If there is no configuration file for the current school, $default is returned.
$configs = array();
function config($path, $default = "", $filename = null) { global $configs;
	// Cache per-filename configuration so we don't hit the disk time after time.
        if(!array_key_exists($filename, $configs)) {
		$configs[$filename] = config_ini(null, $filename);
	}
	$config = $configs[$filename];

	$parts = explode('/', $path);

	foreach($parts as $part) {
		@$config = $config[ $part ];
	}

	if($config == NULL) return $default;
	else return $config;
}

// Dual-use function:
//	1) config() fetches configuration from ini file,
//	2) config(array, filename?) writes out array to ini file.
function config_ini( $array = null, $filename = null) {
	global $config_file;
	if(!$filename) $filename = $config_file;
        if(!is_readable($filename)) {
            //$filename = "schools/default.ini";
            return NULL;
        }
	if(!$array)
		return parse_ini_file($filename, true); 
	else	file_put_contents($filename, ini_stringify($array));
}

// Helper function for config(), takes a possibly-nested array and flattens it
function ini_stringify($array) {
	$rv = '';
	foreach($array as $key => $value) {
		if(gettype($value) == 'array') {
			$rv .= "\n[$key]\n";
			$rv .= ini_stringify($value);
		} else if(preg_match('/[{}|&~!\[()"]/', $value))
			$rv .= "$key = \"$value\"\n"; // add quotes if special chars
		else	$rv .= "$key = $value\n"; // most strings don't need quotes
	}
	return $rv;
}

function redirect_to($url) {
    
    header("Location: ".$url); exit; }
function last_char_of($str) { return $str[strlen($str)-1]; }

// URI = http://v.e.o/dir/action
//	link_to('action2') returns http://v.e.o/dir/action2
//	link_to('/detail') returns http://v.e.o/dir/action/detail
function link_to($path) { global $CURRENT_URI;
	return path_swap($CURRENT_URI, $path);
}
// for $dir = "/append"
// converts "http://vote.eschew.org/brandywine"
//       to "http://vote.eschew.org/brandywine/append"
function path_swap($path, $dir) {
	$path_parts = explode("?", $path, 2);

	$path = $path_parts[0];
	if(last_char_of($path) != '/')
		$path = "$path/";

	if($dir[0] == '/') {
		$path .= substr($dir, 1);
	} else {
		$path = dirname($path) . '/' . $dir;
	}
	$path_parts[0] = $path;
	return implode('?', $path_parts);
}


function ulist($callback, $array) {
	$str = '<ul>';
	foreach($array as $key => $value)
		$str .= " 
		<li><a href=\"".$callback($value)."\">".$value."</a></li>";
	$str .= "\n</ul>";
	return $str;
}

?>