<?php

require_once "UserDAOInterface.php";

class LocalUserDAO implements UserDAOInterface {

    private string $file = "data/users.json";

    private function loadUsers() {
        if (!file_exists($this->file)) {
            return [];
        }

        $json = file_get_contents($this->file);
        $users = json_decode($json, true);

        return is_array($users) ? $users : [];
    }

    private function saveUsers($users) {
        file_put_contents(
            $this->file,
            json_encode($users, JSON_PRETTY_PRINT)
        );
    }

    public function findUser($email) {
        $users = $this->loadUsers();

        foreach ($users as $user) {
            if ($user["email"] === $email) {

                if (!isset($user["vorname"]) && isset($user["username"])) {
                    $nameParts = explode(" ", $user["username"], 2);
                    $user["vorname"] = $nameParts[0] ?? "";
                    $user["nachname"] = $nameParts[1] ?? "";
                }

                return $user;
            }
        }

        return null;
    }

    public function addUser($email, $vorname, $nachname, $password) {
        $users = $this->loadUsers();

        $users[] = [
            "email" => $email,
            "vorname" => $vorname,
            "nachname" => $nachname,
            "password" => $password
        ];

        $this->saveUsers($users);
    }

    public function deleteUser($email) {
        $users = $this->loadUsers();

        foreach ($users as $i => $user) {
            if ($user["email"] === $email) {
                unset($users[$i]);
                $users = array_values($users);
                $this->saveUsers($users);
                return true;
            }
        }

        return false;
    }
}