<?php
session_start();
require_once '../model/LocalArticleManager.php';
require_once '../model/ArticleManager.php';
require_once '../model/Article.php';
require_once '../validator/article-validator.php';

if ($_SERVER["REQUEST_METHOD"] === "POST") {
    $_SESSION["old_title"]    = $_POST["title"] ?? '';
    $_SESSION["old_content"]  = $_POST["content"] ?? '';
    $_SESSION["old_category"] = $_POST["category"] ?? '';
    $_SESSION["old_tags"]     = $_POST["tags"] ?? '';
    try {
        $id = $_GET["id"];
    } catch (Exception $e){
        $_SESSION["message"] = "missing_id";
    }
    if (!isset($_POST["title"]) ||!isset($_POST["content"]) || !isset($_POST["category"])){
        $_SESSION["message"] = "missing_parameters";
    } elseif(!isset($id)) {
        $_SESSION["message"] = "missing_id";
    }else{
        $title = $_POST["title"];
        $content = $_POST["content"];
        $author = "max.mustermann"; // TODO: später aus Session den angemeldeten Nutzer beziehen.
        $category = $_POST["category"];
        if (isset($_POST['tags'])) {
            $tags = $_POST['tags'];
        } else {
            $tags = '';
        }

        // -------------------------------- Validierung der Daten: -------------------------
        if (!articleAuthorValidator($author)) {
            $_SESSION["message"] = "author_not_valid";
            header("location: ../../index.php?pfad=createArticle");
            exit();
        }

        if (!articleTitleValidator($title)) {
            $_SESSION["message"] = "invalid_title";
            header("location: ../../index.php?pfad=createArticle");
            exit();
        }

        if (!articleContentValidator($content)) {
            $_SESSION["message"] = "invalid_content";
            header("location: ../../index.php?pfad=createArticle");
            exit();
        }

        if (!articleCategoryValidator($category)) {
            $_SESSION["message"] = "invalid_category";
            header("location: ../../index.php?pfad=createArticle");
            exit();
        }

        if (!articleTagValidator($_POST["tags"])) {
            $_SESSION["message"] = "invalid_tags";
            header("location: ../../index.php?pfad=createArticle");
            exit();
        } else {
            $cleanedTags = [];
            $rawTags = explode(',', $tags);
            foreach ($rawTags as $rawTag) {
                // Leerzeichen am Anfang/Ende des einzelnen Tags entfernen:
                $tag = trim($rawTag);
                // Duplikate entfernen:
                $cleanedTags = array_unique($cleanedTags);
                $cleanedTags = implode(',', $cleanedTags);
            }
        }

        // ----------------- Übertragung der validierten Daten in ArticleManager: ---------------------------
        try {
            $articleManager = ArticleManager::getInstance();
            $article = $articleManager->getArticle($id);
            $article->setTitle($title);
            $article->setContent($content);
            $article->setCategory($category);
            $article->setTags($cleanedTags);
            $articleManager->updateArticle($id ,$article, $author);
        } catch (Exception $e){
            $_SESSION["message"] = "internal_error";
            header("location: ../../index.php?pfad=createArticle");
            exit();
        }
        $_SESSION["message"] = "article_updated";
        // Weiterleitung zur Homepage
        header("location: ../../index.php?pfad=showArticle&id=$id");
    }
}

?>