<?php

use Random\RandomException;

function isLoggedIn(): bool
{
    global $routerConfig;
    return $_SESSION["ID"] > 0 && !empty($_SESSION["email"]) && $_SESSION["privilegelevel"] >= $routerConfig["logged_in_default_permission_level"];
}

function generateActivationToken(): string
{
    try {
        return bin2hex(random_bytes(16));
    } catch (RandomException $e) {
        return "error_generating_code_because_of_$e";
    } // Adjust the length of the token as needed
}
function verifyPassword($userID, $password): bool
{
    global $mysqli;
    $stmt = $mysqli->prepare("SELECT PasswordHash FROM Users WHERE ID = ?");
    $stmt->bind_param("i", $userID);
    $stmt->execute();
    $pwdhash = "";
    $stmt->bind_result($pwdhash);
    $stmt->fetch();
    $stmt->close();

    return !empty($pwdhash) && password_verify($password, $pwdhash);
}

function doLogin($email, $password): array
{
    global $mysqli, $routerConfig;
    $found = false;
    if(!empty($email) && !empty($password)){
        $stmt = $mysqli->prepare("SELECT ID, FirstName, LastName, Nickname, PasswordHash, MinecraftNick, privilegeLevel FROM Users WHERE EMAIL = ? AND isActive = 1");
        $stmt->bind_param("s", $email);
        $stmt->execute();

        $idcko = 0;
        $fname = "";
        $lname = "";
        $nickname = "";
        $pwdhash = "";
        $mcnick = "";
        $privilegelevel = 0;
        $stmt->bind_result($idcko, $fname, $lname, $nickname, $pwdhash, $mcnick, $privilegelevel);

        if($stmt->num_rows() > 0){
            $stmt->fetch();
            if (password_verify($password, $pwdhash) && $privilegelevel >= $routerConfig["logged_in_default_permission_level"]){
                $found = true;
            }
        }
        $_SESSION["ID"] = $idcko;
        $_SESSION["first_name"] = $fname;
        $_SESSION["last_name"] = $lname;
        $_SESSION["nickname"] = $nickname;
        $_SESSION["email"] = $email;
        $_SESSION["mcnick"] = $mcnick;
        $_SESSION["privilegelevel"] = $privilegelevel;
        $stmt->close();
    }
    return $found ? ["status" => "success"] : ["status" => "fail"];
}

function doLogout(): array
{
    if(isLoggedIn()){
        session_destroy();
        return ["status" => "success"];
    } else {
        return ["status" => "fail"];
    }
}

function doRegister($firstname, $lastname, $nickname, $email, $password, $minecraftnick, $activationtoken): array
{
    global $mysqli;
    $status = ["status" => "fail"];
    if (!empty($activationtoken)){
        $passwordHash = password_hash($password, PASSWORD_DEFAULT);
        $stmt = $mysqli->prepare("UPDATE Users SET FirstName = ?, LastName = ?, Nickname = ?, Email = ?, PasswordHash = ?, MinecraftNick = ?, isAdmin = 0, isActivated = 1 WHERE isActivated = 0 AND ActivationToken = ?");
        $stmt->bind_param("sssssss", $firstname, $lastname, $nickname, $email, $passwordHash, $minecraftnick, $activationtoken);
        $stmt->execute();
        if ($stmt->affected_rows > 0) {
            $status["status"] = "success";
        }
        $stmt->close();
    }
    return $status;
}

function changePassword($userID, $newPassword): array
{
    global $mysqli, $routerConfig;
    $status = ["status" => "fail"];
    if(!empty($userID) && !empty($newPassword) && verifyPassword($userID, $newPassword) && $_SESSION["privilegelevel"] >= $routerConfig["logged_in_default_permission_level"]){
        $passwordHash = password_hash($newPassword, PASSWORD_DEFAULT);
        $stmt = $mysqli->prepare("UPDATE Users SET PasswordHash = ? WHERE ID = ?");
        $stmt->bind_param("si", $passwordHash, $userID);
        $stmt->execute();
        if ($stmt->affected_rows > 0) {
            $status["status"] = "success";
        }
        $stmt->close();
    }
    return $status;
}


function updateUserProfile($userID, $firstName, $lastName, $nickname, $minecraftNick): array
{
    global $mysqli;
    $status = ["status" => "fail"];
    if (!empty($userID)) {
        $stmt = $mysqli->prepare("UPDATE Users SET FirstName = ?, LastName = ?, Nickname = ?, MinecraftNick = ? WHERE ID = ?");
        $stmt->bind_param("ssssi", $firstName, $lastName, $nickname, $minecraftNick, $userID);
        $stmt->execute();
        if ($stmt->affected_rows > 0) {
            $status["status"] = "success";
        }
        $stmt->close();
    }
    return $status;
}

function getUserInfo($userID): array
{
    global $mysqli;
    $userInfo = [];
    if (!empty($userID)) {
        $stmt = $mysqli->prepare("SELECT ID, FirstName, LastName, Nickname, Email, MinecraftNick, privilegeLevel FROM Users WHERE ID = ?");
        $stmt->bind_param("i", $userID);
        $stmt->execute();
        $id = 0;
        $firstName = "";
        $lastName = "";
        $nickname = "";
        $email = "";
        $minecraftNick = "";
        $privilegeLevel = 0;

        $stmt->bind_result($id, $firstName, $lastName, $nickname, $email, $minecraftNick, $privilegeLevel);
        $stmt->fetch();
        $stmt->close();

        $userInfo = [
            "ID" => $id,
            "FirstName" => $firstName,
            "LastName" => $lastName,
            "Nickname" => $nickname,
            "Email" => $email,
            "MinecraftNick" => $minecraftNick,
            "PrivilegeLevel" => $privilegeLevel
        ];
    }
    return $userInfo;
}

function isEmailAvailable($email): bool
{
    global $mysqli;
    $stmt = $mysqli->prepare("SELECT COUNT(*) FROM Users WHERE Email = ?");
    $stmt->bind_param("s", $email);
    $stmt->execute();
    $count = -1;
    $stmt->bind_result($count);
    $stmt->fetch();
    $stmt->close();

    return $count === 0;
}


function addActivationCodes($adminID, $count): array
{
    global $mysqli;
    $activationCodes = [];
    if (!empty($adminID) && is_numeric($count) && $count > 0) {
        $stmt = $mysqli->prepare("INSERT INTO ActivationCodes (AdminID, Code) VALUES (?, ?)");
        for ($i = 0; $i < $count; $i++) {
            $activationCode = generateActivationToken();
            $stmt->bind_param("is", $adminID, $activationCode);
            $stmt->execute();
            if ($stmt->affected_rows > 0) {
                $activationCodes[] = $activationCode;
            }
        }
        $stmt->close();
    }
    return $activationCodes;
}

function listUsers(): array
{
    global $mysqli;
    $users = [];
    $result = $mysqli->query("SELECT ID, FirstName, LastName, Nickname, Email, MinecraftNick, privilegeLevel FROM Users");
    while ($row = $result->fetch_assoc()) {
        $users[] = $row;
    }
    return $users;
}

function listActivationCodes(): array
{
    global $mysqli;
    $activationCodes = [];
    $result = $mysqli->query("SELECT Code FROM ActivationCodes");
    while ($row = $result->fetch_assoc()) {
        $activationCodes[] = $row['Code'];
    }
    return $activationCodes;
}