<?php

namespace com\fwdekker\deathnotifier\user;

use com\fwdekker\deathnotifier\Action;
use com\fwdekker\deathnotifier\ActionException;
use com\fwdekker\deathnotifier\Config;
use com\fwdekker\deathnotifier\Database;
use com\fwdekker\deathnotifier\mailer\Email;
use com\fwdekker\deathnotifier\mailer\MailManager;
use com\fwdekker\deathnotifier\validator\HasLengthRule;
use com\fwdekker\deathnotifier\validator\IsEmailRule;
use com\fwdekker\deathnotifier\validator\InvalidInputException;
use PDO;


/**
 * Registers a new user.
 */
class RegisterAction extends Action
{
    /**
     * @var PDO the connection to register the user with
     */
    private readonly PDO $conn;
    /**
     * @var UserManager the manager to register the user with
     */
    private readonly UserManager $user_manager;
    /**
     * @var MailManager the manager to send emails with
     */
    private readonly MailManager $mail_manager;


    /**
     * Constructs a new `RegisterAction`.
     *
     * @param PDO $conn the connection to register the user with
     * @param UserManager $user_manager the manager to register the user with
     * @param MailManager $mail_manager the manager to send emails with
     */
    public function __construct(PDO $conn, UserManager $user_manager, MailManager $mail_manager)
    {
        parent::__construct(
            require_logged_out: true,
            require_valid_csrf_token: true,
            rule_lists: [
                "email" => [new IsEmailRule()],
                "password" => [new HasLengthRule(UserManager::MIN_PASSWORD_LENGTH, UserManager::MAX_PASSWORD_LENGTH)],
            ],
        );

        $this->conn = $conn;
        $this->user_manager = $user_manager;
        $this->mail_manager = $mail_manager;
    }


    /**
     * Registers a new user.
     *
     * @param array<int|string, mixed> $inputs `"email": string`: the email address to register, `"password": string`:
     * the password to use for the new account
     * @return null
     * @throws InvalidInputException if the email address is already used
     */
    function handle(array $inputs): mixed
    {
        Database::transaction($this->conn, function () use ($inputs) {
            if ($this->user_manager->has_user_with_email($inputs["email"]))
                throw new InvalidInputException("That email address already in use by someone else.", "email");

            $uuid = $this->user_manager->add_user($inputs["email"], $inputs["password"]);
            $user_data = $this->user_manager->get_user_by_uuid($uuid);
            if ($user_data === null)
                throw new ActionException("Failed to retrieve account data. Refresh the page and try again.");
            $token = $user_data["email_verification_token"];

            $this->mail_manager->queue_email(new RegisterEmail($inputs["email"], $token));
        });

        return null;
    }
}


/**
 * An email to be sent to a recently registered user, including instructions for email verification.
 */
class RegisterEmail extends Email
{
    /**
     * A string identifying the type of email.
     */
    public const TYPE = "register";

    /**
     * @var string the token to verify the email address with
     */
    public string $token;


    /**
     * Constructs a new `RegisterEmail`.
     *
     * @param string $recipient the intended recipient of the email
     * @param string $token the token to verify the email address with
     */
    public function __construct(string $recipient, string $token)
    {
        parent::__construct($this::TYPE, $recipient);

        $this->token = $token;
    }

    public function get_subject(): string
    {
        return "Welcome to Death Notifier";
    }

    public function get_body(): string
    {
        $base_path = Config::get()["server"]["base_path"];
        $verify_path = "$base_path?action=verify-email&email=" . rawurlencode($this->recipient) . "&token=$this->token";

        return
            "You have successfully created an account with Death Notifier. " .
            "Welcome!" .
            "\n\n" .
            "Until you verify your email address, you will not receive any notifications. " .
            "You can verify your email address by clicking the link below. " .
            "This link will expire after " . UserManager::MINUTES_VALID_VERIFICATION . " minutes." .
            "\n" .
            "Verify: $verify_path" .
            "\n\n" .
            "If you did not create this account, you can delete the account. " .
            "Go to the Death Notifier website, reset your password, log in, and delete the account." .
            "\n\n" .
            $base_path;
    }
}