<?php

namespace Lucent\Account;

use Carbon\Carbon;
use Illuminate\Contracts\Session\Session;
use Illuminate\Support\Facades\Mail;
use Illuminate\Support\Str;
use Lucent\Channel\ChannelService;
use Lucent\LucentException;
use Lucent\Mail\LoginMail;

readonly class AuthService
{

    public function __construct(
        private ChannelService $channelService,
        private UserRepo       $userRepo,
        public Session         $session,
    )
    {

    }


    public function currentUserId(): ?string
    {
        if(app()->runningInConsole()){
            return config("lucent.systemUserId");
        }else{
            return $this->session->get("user.id");
        }

    }

    public function isLoggedIn(): bool
    {
        return !empty($this->currentUserId());
    }

    /**
     * @throws LucentException
     */
    public function login(string $email, string $token): void
    {

        $user = $this->userRepo->findByEmail(new Email($email));

        if ($user->isEmpty()) {
            throw new LucentException("You account was not found");
        }

        if ($user->get()->role === Role::REMOVED) {
            throw new LucentException("Your account is not active");
        }

        if ($user->get()->mailToken !== $token) {
            throw new LucentException("Token has expired or is invalid");
        }

        if (Carbon::parse($user->get()->loggedInAt)->lte(Carbon::now()->subHours(1))) {
            throw new LucentException("Token has expired.");
        }

        $newUser = $user->get();
        $newUser->updatedAt = Carbon::now()->toJson();
        $newUser->mailToken = null;
        $this->userRepo->update($newUser);

        $this->session->put(["user" => $user->get()->safe()]);
    }


    public function create(string $name, string $email, string $role): User
    {
        $user = new User(
            id: (string)Str::uuid(),
            name: new Name($name),
            email: new Email($email),
            role: Role::from($role),
            createdAt: Carbon::now()->toJson(),
            updatedAt: Carbon::now()->toJson(),
            loggedInAt: Carbon::now()->toJson(),
            mailToken: Token::new(32),
        );

        $this->userRepo->insert($user);
        return $user;
    }


    /**
     * @throws LucentException
     */
    public function sendLoginEmail(string $email): void
    {
        $emailAddress = (new Email($email));
        $user = $this->userRepo->findByEmail($emailAddress);

        if ($user->isEmpty()) {
            throw new LucentException("User not found");
        }

        if ($user->get()->role === Role::REMOVED) {
            throw new LucentException("Cannot reset email if the user is not active");
        }


        $newToken = $this->userRepo->updateLoginToken($user->get()->id);

        Mail::to($email)->send(
            new LoginMail(
                $email,
                $newToken,
                $this->channelService->channel->lucentUrl
            )
        );
    }


    /**
     * @throws LucentException
     */
    public function changeRole(string $userId, string $newRole): void
    {
        $user = $this->userRepo->findById($userId);

        if ($user->isEmpty()) {
            throw new LucentException("User not found");
        }

        $newUser = $user->get();
        $newUser->role = Role::from($newRole);
        $newUser->updatedAt = Carbon::now()->toJson();
        $this->userRepo->update($newUser);
    }

    /**
     * @throws LucentException
     */
    public function updateName( string $name): void
    {
        $name = (new Name($name));
        $this->userRepo->updateName($this->currentUserId(), $name);
        $user = $this->userRepo->findById($this->currentUserId());
        $this->session->put(["user" => $user->get()->safe()]);
    }

    /**
     * @throws LucentException
     */
    public function updateEmail(string $email): void
    {
        $email = (new Email($email));
        $user = $this->userRepo->findByEmail($email);
        if($user->isDefined()){
            throw new LucentException("Email already assigned to user");
        }

        $this->userRepo->updateEmail($this->currentUserId(), $email);
        $user = $this->userRepo->findById($this->currentUserId());
        $this->session->put(["user" => $user->get()->safe()]);
    }


    /**
     * @throws LucentException
     */
    public function invite(
        string $name,
        string $email,
        string $role
    ): User
    {
        $user = $this->create($name, $email, $role);
        $this->sendLoginEmail($user->email);
        return $user;
    }

    /**
     * @throws LucentException
     */
    public function registerAdmin(
        string $name,
        string $email
    ): User
    {
        $user = $this->invite($name, $email, "admin");
        $this->sendLoginEmail($user->email);
        return $user;
    }


}