<?php

namespace Blog\Controller;

use Blog\Model\UserModel;

class UserController{
    private $view;  
    private $db;
    private $validData = array();
    private $errors = array();

    private $labels = [
    "name" => "Vorname*",
    "lastname" => "Nachname*",
    "email" => "E-Mail*",
    "password" => "Passwort*",
    "role" => "Rolle*"
    ];

    private $validLoginData = array();
    private $loginErrors = array();
    private $loginLabels = [
        "email" => "E-Mail*",
        "password" => "Passwort*",
    ];

    private $changeUserLabels = [
        'name'     => 'Vorname*',
        'lastname' => 'Nachname*',
        'email'    => 'E-Mail*',
        'password' => 'Passwort*',
    ];

    private $kursValidData = array();
    private $kursErrors = array();
    private $kursLabels = array(
    "name" => "Name*", 
    "preis" => "€ Preis*",  
    "dauer" => "Dauer* (Stunden)",
    "rabatt" => "Rabatt", 
    "kategorie" => "Kategorie",
    "1" => "|", 
    "stadt" => "Stadt*", 
    "strasse" => "Straße und Nummer*", 
    "plz" => "PLZ*",
    "2" => "|",
    "beschreibung" => "Beschreibung");	

    public function __construct($view){
        $this->db = new UserModel();
        $this->view = $view;
    }

    public function showUserRegisterForm(){
        if (!isset($this->errors)) {
            $this->errors = [];
        }
        if (!isset($this->validData)) {
            $this->validData = [];
        }

        $this->view->setVars([
            'labels' => $this->labels,
            'errors' => $this->errors,
            'validData' => $this->validData
        ]);
        
    }

    public function showUserRegisterConfirmation(){

    }

    public function showUserLoginForm(){
        $this->view->setVars([
                    'labels' => $this->loginLabels,
                    'errors' => $this->loginErrors,
                    'validData' => $this->validLoginData
                ]);
    }

    private function validateForm() {
        foreach ($this->labels as $key => $label) {
            if (!isset($_POST[$key]) || trim($_POST[$key]) === '') {
                $this->errors[$key] = "Bitte $label angeben";
            } else {
                $this->validData[$key] = trim($_POST[$key]);
            }
        }

        if (isset($this->validData['password'])) {
            if (strlen($this->validData['password']) < 6) {
                $this->errors['password'] = "Das Passwort muss mindestens 6 Zeichen lang sein.";
            }
        }

        if (isset($this->validData['email']) && !filter_var($this->validData['email'], FILTER_VALIDATE_EMAIL)) {
            $this->errors['email'] = "Bitte eine gültige E-Mail-Adresse eingeben.";
        }
    }

    public function validateLoginForm(){
        foreach ($this->loginLabels as $key => $label) {
            if (isset($this->validData['password'])) {
                if (strlen($this->validData['password']) < 6) {
                    $this->errors['password'] = "Das Passwort muss mindestens 6 Zeichen lang sein.";
                }
             }

            if (isset($this->validData['email']) && !filter_var($this->validData['email'], FILTER_VALIDATE_EMAIL)) {
                $this->errors['email'] = "Bitte eine gültige E-Mail-Adresse eingeben.";
            }
        }
    }

    public function validateKursForm(){
        foreach ($this->kursLabels as $index => $value) {
            if($value === "|") continue;
            if (strpos($value, "*") !== false && (!isset($_POST[$index]) || empty($_POST[$index]))) {
                $this->kursErrors[$index] = "Bitte " . $value . " eingeben";
            } else {
                $this->kursValidData[$index] = $_POST[$index] === '' ? null : $_POST[$index];
            }       
        }
        if (count($this->errors) > 0) {
            $this->view->setDoMethodName("showUserAccountPage");
            $this->showUserAccountPage();
        } else {
            if ($this->db->writeNewCourse($this->kursValidData, $_SESSION["user_id"])) {
                $this->view->setDoMethodName("showNewKursConfirmation");
                $this->showConfirmation();
            }
        }
    }

    public function showConfirmation(){}

    public function showUserLoginConfirmation(){
        $userId = $this->getCurrentUserId();
        $user = null;
        if($userId){
            $user = $this->db->getUserById($userId);
        }

        $path = "Views/User/showUserLoginConfirmation.phtml";
            if(file_exists($path)){
            include $path;
       }
    }

    public function register(){
        $this->validateForm();

        if(count($this->errors) > 0){
            $this->view->setDoMethodName("showUserRegisterForm");
            $this->showUserRegisterForm();
        } else{
            $this->db->createUser($_POST);
            $this->login();
        }
    }

    public function login(){
        $user = $this->db->getUserByEmail($_POST["email"]);

        $this->validateLoginForm();

        if(!$user){
            $this->loginErrors['email'] = "Email oder Passwort ist falsch";
            $this->view->setDoMethodName("showUserLoginForm");
            $this->showUserLoginForm();
            return;
        }

        $hash = hash('sha256', $_POST["password"] . $user["salt"]);

        if($hash == $user["passwort"]){
            $this->setUserSession($user);
            $this->showUserLoginConfirmation();
        }else{
            echo "Falsches Passwort";
        }
    }

    public function setUserSession(array $user){
        $_SESSION["user_id"] = $user["id"];
        $_SESSION["user_role"] = $user["role"];
        $_SESSION["vorname"] = $user["vorname"];
        $_SESSION["name"] = $user["name"];
    }

    public function clearUserSession(){
        unset($_SESSION["user_id"], $_SESSION["user_role"], $_SESSION["vorname"], $_SESSION["name"]);
    }

    public function logout(){
        $this->clearUserSession();
        header("Location: index.php?controller=user&do=showUserLoginForm");
        exit();
    }

    public function isUserLoggenIn(){
        return isset($_SESSION["user_id"]) && $_SESSION["user_id"] != null;
    }

    public function getCurrentUserId(){
        return $_SESSION["user_id"] ?? null;
    }

    public function showUserAccountPage (){
        $this->view->setVars([
            'labels' => $this->kursLabels,
            'errors' => $this->kursErrors,
            'validData' => $this->kursValidData
        ]);
    }

    public function showUserDeleteConfirmation(){

    }

    public function deleteAccount(){
        $userId = $this->getCurrentUserId();
        if($userId){
            $this->db->deleteUser($userId);
            $this->clearUserSession();
            $this->view->setDoMethodName("showUserDeleteConfirmation");
            $this->showUserDeleteConfirmation();
        }
    }

    public function changeAccountDataRedirect(){
        $userId = $this->getCurrentUserId();
        if($userId){
            $this->view->setDoMethodName("showUserChangeAccountSettings");
            $this->showUserChangeAccountSettings();
        }
    }

    public function showUserChangeAccountSettings(){
        $userId = $this->getCurrentUserId();
        if(!$userId){
            header("Location: index.php?controller=user&do=showUserLoginForm");
            exit();
        }

        $currentUser = $this->db->getUserById($userId);
        if(!$currentUser){
            throw new \Exception("User nicht gefunden");
        }

        $validData = [
            'name' => $currentUser["name"],
            'vorname' => $currentUser["vorname"],
            'email' => $currentUser["email"],
        ];

        $this->view->setVars([
            'labels'    => $this->changeUserLabels,
            'validData' => $validData,
            'errors'    => $this->errors,
            'message'   => $this->message ?? null,
        ]);

        $this->view->render('User/showUserChangeAccountSettings');
    }

    public function updateAccountData()
    {
        $userId = $this->getCurrentUserId();
        if (!$userId) {
            header('Location: index.php?controller=user&do=showUserLoginForm');
            exit;
        }

        $currentUser = $this->db->getUserById($userId);
        if (!$currentUser) {
            throw new \Exception('User nicht gefunden');
        }

        $submitted = [
            'name'     => trim($_POST['name']     ?? ''),
            'lastname' => trim($_POST['lastname'] ?? ''),
            'email'    => trim($_POST['email']    ?? ''),
            'password' => trim($_POST['password'] ?? ''),
        ];

        $this->errors = [];
        if (strlen($submitted['name']) < 2) {
            $this->errors['name'] = 'Vorname muss mindestens 2 Zeichen haben.';
        }
        if (strlen($submitted['lastname']) < 2) {
            $this->errors['lastname'] = 'Nachname muss mindestens 2 Zeichen haben.';
        }
        if (!filter_var($submitted['email'], FILTER_VALIDATE_EMAIL)) {
            $this->errors['email'] = 'Ungültige E-Mail-Adresse.';
        }
        if ($submitted['password'] !== '' && strlen($submitted['password']) < 6) {
            $this->errors['password'] = 'Passwort muss mindestens 6 Zeichen haben.';
        }

        if (count($this->errors) > 0) {
            $this->view->setVars([
                'labels'    => $this->changeUserLabels,
                'validData' => $submitted,
                'errors'    => $this->errors,
            ]);
            return $this->showUserChangeAccountSettings();
        }

        $updateData = [];
        foreach (['name','lastname','email'] as $field) {
            if ($submitted[$field] !== $currentUser[$field]) {
                $updateData[$field] = $submitted[$field];
            }
        }
        if ($submitted['password'] !== '') {
            $salt               = bin2hex(random_bytes(16));
            $hash               = hash('sha256', $submitted['password'] . $salt);
            $updateData['passwort'] = $hash;
            $updateData['salt']     = $salt;
        }

        if (empty($updateData)) {
            $this->message = 'Keine Änderungen festgestellt.';
            return $this->showUserChangeAccountSettings();
        }

        $ok = $this->db->updateUserData($userId, $updateData);

        if ($ok) {
            // Session‑Werte aktualisieren
            $_SESSION['vorname'] = $updateData['name']     ?? $_SESSION['vorname'];
            $_SESSION['name']    = $updateData['lastname'] ?? $_SESSION['name'];
            $_SESSION['email']   = $updateData['email']    ?? $_SESSION['email'];
            $this->message       = 'Änderungen erfolgreich gespeichert.';
        } else {
            $this->errors['general'] = 'Beim Speichern ist ein Fehler aufgetreten.';
        }

        return $this->showUserChangeAccountSettings();
    }


}