<?php

namespace Blog\Model;

use DateTime;
use PDO;
use PDOException;

class AuthModel extends Database
{
    public function login($email, $password){
        $params = [":email" => $email];
        $sql = "SELECT email, password, validUntil FROM user WHERE email = :email";

        $pdo = $this->linkDB();

        try {
            $sth = $pdo->prepare($sql);
            $sth->execute($params);
            $user = $sth->fetch(PDO::FETCH_ASSOC);
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler beim Abrufen der Daten.", $e);
            die;
        }


        if (!$user) {
            return false;
        }

        if (!password_verify($password, $user['password'])) {
            return false;
        }

        $now = new DateTime();
        $validUntil = new DateTime($user['validUntil']);

        if ($now > $validUntil) {
            return "Ihr Passwort ist abgelaufen. Bitte setzen Sie ein neues über: \"Passwort vergessen\".";
        }

        return true;
    }

    public function register($email, $password, $street, $houseNumber, $city, $postalCode, $country, $firstName, $lastName, $phone, $isAdmin) {
        $rtn = $this->pwRequirementCheck($password);
        if($rtn !== true){
            return $rtn;
        }

        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            return "Bitte geben Sie eine gültige E-Mail ein.";
        }

        $requiredFields = [$email, $password, $street, $houseNumber, $city, $postalCode, $country, $firstName, $lastName, $phone];
        foreach ($requiredFields as $field) {
            if (empty($field)) {
                return "Bitte füllen Sie alle Felder aus";
            }
        }

        try {
            $pdo = $this->linkDB();
            $stmt = $pdo->prepare("SELECT userid FROM user WHERE email = :email");
            $stmt->execute([':email' => $email]);
            if($stmt-> fetch()){
                return "Der Account mit der Email, existiert bereits.";
            }
        } catch (PDOException $e){
            new \Blog\Library\ErrorMsg("Fehler beim Abrufen der Daten", $e);
            die;
        }

        $hashedPassword = password_hash($password, PASSWORD_DEFAULT);

        $sql = "INSERT INTO user (email, password, straße, hausnr, ort, postleitzahl,land, vorname, nachname, tel, isAdmin) 
                VALUES (:email, :password, :straße, :hausnr, :ort, :postleitzahl, :land, :vorname, :nachname, :tel, :isAdmin)";

        try{
            $pdo = $this->linkDB();
            $stmt = $pdo->prepare($sql);
            $stmt->execute([
                ':email' => $email,
                ':password' => $hashedPassword,
                ':straße' => $street,
                ':hausnr' => $houseNumber,
                ':ort' => $city,
                ':postleitzahl' => $postalCode,
                ':land' => $country,
                ':vorname' => $firstName,
                ':nachname' => $lastName,
                ':tel' => $phone,
                ':isAdmin' => $isAdmin
            ]);
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler beim Schreiben der Daten.", $e);
            die;
        }

    }

    private function pwRequirementCheck($password){
        $error = [];

        if(strlen($password) <= 8)
            $error[] = "min 8 Charackter";
        if(!preg_match("/[A-Z]/", $password))
            $error[] = "min one large Character";
        if(!preg_match("/[a-z]/", $password))
            $error[] = "min one small charakter";
        if(!preg_match("/[0-9]/", $password))
            $error[] = "min one number";
        if(!preg_match("[^a-zA-Z0-9\s]", $password));
            $error[] = "min one special character";

        if(empty($error))
            return true;
        else
            return $error;
    }

    public function pwForgot($email){
        $randomPw = bin2hex(random_bytes(12 / 2));
        $hashedPassword = password_hash($randomPw, PASSWORD_DEFAULT);

        $this->forgottenPwUpdate($email, $hashedPassword);

        $betreff = "Passwort zurücksetzen bei bibArts";
        $nachricht = "Hallo,\n\nhier ihr temporäres Passwort:\n\n $randomPw \n\n Bitte beachten Sie, dass das Passwort nur 2 stunden Gülltig ist. \nViele Grüße,\nbibArts Team";

        $header = "From: noreply@edu.bib.de\r\n";
        $header .= "Content-Type: text/plain; charset=UTF-8\r\n";

        $maxTries = 5;
        $try = 0;
        $success = false;

        while ($try < $maxTries && !$success) {
            $erfolg = mail($email, $betreff, $nachricht, $header);
            $try++;
            if (!$erfolg) {
                error_log("Mailversuch $try an $email fehlgeschlagen.");
                sleep(1);
            }
        }
    }

    private function forgottenPwUpdate($email, $hashedPassword)
    {
        try{
            $pdo = $this->linkDB();

            $sqlCheck = "SELECT COUNT(*) FROM user WHERE email = :email";
            $stmt = $pdo->prepare($sqlCheck);
            $stmt->execute([':email' => $email]);
            if ($stmt->fetchColumn() == 0) {
                return false;
            }

            $validUntil = (new DateTime())->add(new DateInterval('PT2H'))->format('Y-m-d H:i:s');


            $sql = "UPDATE user 
                    SET password = :password, validUntil = :validUntil
                    WHERE email = :email";

            $stmt = $pdo->prepare($sql);
            return $stmt->execute([
                ':email' => $email,
                ':password' => $hashedPassword,
                ':validUntil' => $validUntil
            ]);
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler beim Aktualisieren der Daten.", $e);
            die;
            return false;
        }
    }

    public function updatePassword($email, $oldpw, $newpw){
        if(!$this->login($email, $oldpw)) {
            return false;
        }

        $requiredFields = [$email, $oldpw, $newpw];
        foreach ($requiredFields as $field) {
            if (empty($field)) {
                return "Bitte füllen Sie alle Felder aus";
            }
        }
        $hashedPassword = password_hash($newpw, PASSWORD_DEFAULT);

        $sql = "INSERT INTO user (email, password) 
                    VALUES (:email, :password)";

        try{
            $pdo = $this->linkDB();
            $stmt = $pdo->prepare($sql);
            return $stmt->execute([
                ':email' => $email,
                ':password' => $hashedPassword,
            ]);
        } catch (PDOException $e) {
            new \Blog\Library\ErrorMsg("Fehler beim Schreiben der Daten.", $e);
            die;
        }
    }

    public function checkDoublePw($password1, $password2){
        if($password1 === $password2){
            return true;
        }
        else
            return false;
    }
}