<?php

require_once $_SERVER['DOCUMENT_ROOT'] . "/includes/session.inc"; global $isLoggedIn;
if (!$isLoggedIn) header("Location: /-/login") and die();

$system = $_GET['s'] ?? null;
$member = $_GET['m'] ?? null;
$index = (int)$_GET['i'] ?? null;
$type = $_GET['t'] ?? null;
$date = $_GET['d'] ?? null;

if (!isset($system) || trim($system) === "" || strlen($system) !== 5 || !preg_match("/[a-z]/i", $system) || ($system !== "gdapd" && $system !== "ynmuc"))
    header("Location: /?error=System not found") and die();

if (!isset($type) || trim($type) === "")
    header("Location: /?error=Type not found") and die();

if (!isset($date) || trim($date) === "" || strlen($date) !== 10 || !preg_match("/[\d-]/i", $date))
    header("Location: /?error=Date not found") and die();

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

function moveElement(&$array, $a, $b) {
    $out = array_splice($array, $a, 1);
    array_splice($array, $b, 0, $out);
}

switch ($type) {
    case "add":
        if (!isset($member) || trim($member) === "" || strlen($member) !== 5 || !preg_match("/[a-z]/i", $member))
            if ($member !== null && $member !== "null") header("Location: /?error=System member not found") and die();

        if (!isset($list[$date])) $list[$date] = [];
        $list[$date][] = [$member, null];
        break;

    case "cofront":
        if (!isset($index) || trim($index) === "" || is_integer($index))
            if ($index !== null && $index !== "null") header("Location: /?error=Invalid index") and die();

        $day = $list[$date];

        if (!isset($day[$index]))
            if ($index !== null && $index !== "null") header("Location: /?error=Index not found") and die();

        if (!isset($member) || trim($member) === "" || strlen($member) !== 5 || !preg_match("/[a-z]/i", $member))
            if ($member !== null && $member !== "null") header("Location: /?error=System member not found") and die();

        $list[$date][$index][1] = $member;
        break;

    case "delete":
        if (!isset($index) || trim($index) === "" || is_integer($index))
            if ($index !== null && $index !== "null") header("Location: /?error=Invalid index") and die();

        $day = $list[$date];

        if (!isset($day[$index]))
            if ($index !== null && $index !== "null") header("Location: /?error=Index not found") and die();

        unset($day[$index]);
        $list[$date] = array_values($day);

        break;

    case "codelete":
        if (!isset($index) || trim($index) === "" || is_integer($index))
            if ($index !== null && $index !== "null") header("Location: /?error=Invalid index") and die();

        $day = $list[$date];

        if (!isset($day[$index]))
            if ($index !== null && $index !== "null") header("Location: /?error=Index not found") and die();

        $list[$date][$index][1] = null;

        break;

    case "down":
        if (!isset($index) || trim($index) === "" || is_integer($index))
            if ($index !== null && $index !== "null") header("Location: /?error=Invalid index") and die();

        if (!isset($day[$index]))
            if ($index !== null && $index !== "null") header("Location: /?error=Index not found") and die();

        $day = $list[$date];
        moveElement($list[$date], $index, $index + 1 < count($list[$date]) ? $index + 1 : $index);

        break;

    case "up":
        if (!isset($index) || trim($index) === "" || is_integer($index))
            if ($index !== null && $index !== "null") header("Location: /?error=Invalid index") and die();

        if (!isset($day[$index]))
            if ($index !== null && $index !== "null") header("Location: /?error=Index not found") and die();

        $day = $list[$date];
        moveElement($list[$date], $index, $index - 1 > -1 ? $index - 1 : $index);

        break;

    default:
        header("Location: /?error=Invalid type name") and die();
        break;
}

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

die();