<?php

require_once './composer/vendor/autoload.php';
$_SERVER['DOCUMENT_ROOT'] = "..";

$app = json_decode(file_get_contents("./app.json"), true);
@mkdir("./data");

file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/includes/data/calendar.ics", file_get_contents($app["calendar"]));

$version = json_decode(file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/includes/data/version.json"), true);

$ignore = [
    $_SERVER['DOCUMENT_ROOT'] . "/Data",
    $_SERVER['DOCUMENT_ROOT'] . "/bits/Data",
    $_SERVER['DOCUMENT_ROOT'] . "/Private/Data",
    $_SERVER['DOCUMENT_ROOT'] . "/bits/Data",
    $_SERVER['DOCUMENT_ROOT'] . "/bits/Private/Data",
    $_SERVER['DOCUMENT_ROOT'] . "/includes/data",
    $_SERVER['DOCUMENT_ROOT'] . "/includes/tokens",
    $_SERVER['DOCUMENT_ROOT'] . "/app",
    $_SERVER['DOCUMENT_ROOT'] . "/assets",
];

$screens = array_values(array_filter(scandir($_SERVER['DOCUMENT_ROOT'] . "/includes/data/computers/screens"), function ($i) {
    return !str_starts_with($i, ".");
}));

$computers = array_values(array_filter(scandir($_SERVER['DOCUMENT_ROOT'] . "/includes/data/computers/metadata"), function ($i) {
    return !str_starts_with($i, ".");
}));

foreach ($screens as $screen) {
    $delete = true;
    $id = explode(".", explode("-", $screen)[2])[0];

    foreach ($computers as $file) {
        $computer = json_decode(file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/includes/data/computers/metadata/" . $file), true);

        foreach ($computer["screens"] as $sel) {
            if ($sel["id"] === $id) $delete = false;
        }
    }

    if ($delete) unlink($_SERVER['DOCUMENT_ROOT'] . "/includes/data/computers/screens/" . $screen);
}

function rscandir($dir) {
    global $ignore;
    $files = [];

    foreach (array_filter(scandir($dir), function ($i) {
        return !str_starts_with($i, ".");
    }) as $file) {
        if (in_array($dir . "/" . $file, $ignore)) continue;

        if (is_dir($dir . "/" . $file)) {
            array_push($files, ...rscandir($dir . "/" . $file));
        } else {
            $files[] = $dir . "/" . $file;
        }
    }

    return array_unique($files);
}

function calculateVersionNumber() {
    $files = rscandir($_SERVER['DOCUMENT_ROOT']);
    $hashes = [];

    foreach ($files as $file) {
        $hashes[] = md5_file($file);
    }

    $hash = md5(implode("", $hashes));
    return [$hash, $hashes];
}

$versionHash = calculateVersionNumber();

if ($versionHash[0] !== $version["hash"]) {
    $version["hash"] = $versionHash[0];
    $version["timestamp"] = time();
    $version["revision"] = 0;
    $version["list"] = [
        "current" => $versionHash[1],
        "old" => isset($version["list"]) ? $version["list"]["current"] ?? null : null
    ];
    $version["build"]++;
} else {
    $version["revision"]++;
}

file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/includes/data/version.json", json_encode($version));

if (!is_link($_SERVER['DOCUMENT_ROOT'] . "/includes/data/" . $app["other"]["id"])) {
    link($_SERVER['DOCUMENT_ROOT'] . "/includes/data/other", $_SERVER['DOCUMENT_ROOT'] . "/includes/data/" . $app["other"]["id"]);
}

echo("Backing up...\n");

$lastBackup = (int)trim(file_get_contents($_SERVER['DOCUMENT_ROOT'] . "/includes/data/backup.txt"));

if (time() - $lastBackup >= 3600) {
    require_once "./refresh/backup.inc";
    file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/includes/data/backup.txt", time());
    echo("Backup completed\n");
} else {
    echo("Backup skipped\n");
}

echo("Fetching school information...\n");
file_put_contents($_SERVER['DOCUMENT_ROOT'] . "/includes/data/school.json", "{}");

chdir("./external/school");
exec("node index.js");
chdir("../..");

echo("Fetched school information\n");

echo("Completed.\n");