<?php

if(count($action)<2) {
    gen_error_400("missing argument action[1]");
    exit;
}

//change $action[1](cid) based on $alias2cid_l

if(count($action)>1&&strlen($action[1])>0) {
    require(__DIR__."/phplib/libvar_alias2cid.php");
    $alias2cid=[];
    if(array_key_exists($game, $alias2cid_l)) {
        $alias2cid=$alias2cid_l[$game];
    }
    unset($alias2cid_l);
    if(array_key_exists($action[1], $alias2cid)) {
        $action[1]=$alias2cid[$action[1]];
    }
    unset($alias2cid);
}

$cid=$action[1];

require(__DIR__."/phplib/libvar_cid2tid.php");

if(!array_key_exists($game, $cid2tid_l)) {
    gen_error_404("the game ".$game." does not exist");
    exit;
}
$gtid_l=$cid2tid_l[$game];
unset($cid2tid_l);

if(!array_key_exists($cid, $gtid_l)) {
    gen_error_404("the cid ".$cid." in game ".$game." does not exist");
    exit;
}

$tid=$gtid_l[$cid];

require(__DIR__."/phplib/libvar_tid2proj.php");

if(!array_key_exists($tid, $tid2proj_l)) {
    gen_error_500("the tid ".$tid." does not exist");
    exit;
}

$proj=$tid2proj_l[$tid];

require(__DIR__."/phplib/libvar_gsec.php");

if(!array_key_exists($game, $gsecret_l)) {
    gen_error_400("game '".$game."' is not found in config file.");
    exit;
}

$ginfo=$gsecret_l[$game];
unset($gsecret_l);

/*
    $GLOBALS["game"]=$game;
    $GLOBALS["action"]=$action;
    $GLOBALS["cid"]=$cid;
    $GLOBALS["tid"]=$tid;
    $GLOBALS["proj"]=$proj;
    $GLOBALS["ginfo"]=$ginfo;
*/

$pf=realpath(__DIR__."/".$proj["path"]."/handle_external_flag.php");

if(!is_readable($pf)) {
    $pf1=realpath(__DIR__."/".$proj["path"]."/automake_attachment.php");
    if(is_readable($pf1)) {
        gen_error_404("challange ".$proj["name"]." has been found, but the entry handle_external_flag.php does not exist. However, the entry automake_attachment.php was found. ARE YOU SURE this challenge is EXTERNAL?");
        exit;
    }
    gen_error_500("challange ".$proj["name"]." has been found, but the entry handle_external_flag.php does not exist.");
    exit;
}

//the included script should handle the rest of the request
require($pf);

exit;