<?php

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**
 * Make things happen when buttons are pressed and forms submitted.
 */
require_once __DIR__ . "/required.php";

if ($VARS['action'] !== "signout") {
    dieifnotloggedin();
}

/**
 * Redirects back to the page ID in $_POST/$_GET['source'] with the given message ID.
 * The message will be displayed by the app.
 * @param string $msg message ID (see lang/messages.php)
 * @param string $arg If set, replaces "{arg}" in the message string when displayed to the user.
 */
function returnToSender($msg, $arg = "") {
    global $VARS;
    if ($arg == "") {
        header("Location: app.php?page=" . urlencode($VARS['source']) . "&msg=" . $msg);
    } else {
        header("Location: app.php?page=" . urlencode($VARS['source']) . "&msg=$msg&arg=$arg");
    }
    die();
}

switch ($VARS['action']) {
    case "signout":
        session_destroy();
        header('Location: index.php');
        die("Logged out.");
    case "savenote":
        if (!isset($VARS['content']) || empty($VARS['noteid'])) {
            die($Strings->get("invalid parameters", false));
        }
        http_response_code(204);
        $note = Note::loadNote($VARS['noteid']);
        if (!$note->hasWriteAccess(new User($_SESSION['uid']))) {
            die($Strings->get("invalid parameters", false));
        }
        $note->setText($VARS['content']);
        $note->setColor($VARS['color']);
        $note->saveNote();
        break;
    case "deletenote":
        if (empty($VARS['noteid'])) {
            die($Strings->get("invalid parameters"));
        }
        $note = Note::loadNote($VARS['noteid']);
        if (!$note->hasWriteAccess(new User($_SESSION['uid']))) {
            die($Strings->get("invalid parameters"));
        }
        $note->deleteNote();
        returnToSender("note_deleted");
    case "downloadnote":
        if (empty($VARS['noteid'])) {
            die($Strings->get("invalid parameters", false));
        }
        $note = Note::loadNote($VARS['noteid']);
        if (!$note->hasReadAccess(new User($_SESSION['uid']))) {
            die($Strings->get("invalid parameters", false));
        }
        header("Content-Type: text/markdown; charset=UTF-8");
        header("Content-disposition: attachment; filename=\"" . $note->getCleanTitle() . "_" . $note->getModified() . ".md\"");
        echo $note->getText();
}