use crate::prelude::*;
use arrayvec::ArrayString;
use cryptography::passwords::generate_passwords;
use std::fmt::Write;
use teloxide::types::ParseMode;
use tokio::task::spawn_blocking;

const MESSAGE_HEADER: &str = "Passwords:";
const PASSWORD_LENGTH: usize = 32;
const PASSWORD_PADDING_LENGTH: usize = 3;
const AMOUNT_OF_PASSWORDS: usize = 10;
type PasswordArray = [ArrayString<PASSWORD_LENGTH>; AMOUNT_OF_PASSWORDS];
const BUFFER_LENGTH: usize =
    MESSAGE_HEADER.len() + (PASSWORD_LENGTH + PASSWORD_PADDING_LENGTH) * AMOUNT_OF_PASSWORDS;

/// Handles /`gen_password` command by generating 10 copyable passwords and sending them to the user
#[inline]
pub async fn gen_password(bot: Throttle<Bot>, msg: Message) -> crate::Result<()> {
    let mut message: ArrayString<BUFFER_LENGTH> = MESSAGE_HEADER.try_into().unwrap();
    let passwords: PasswordArray = spawn_blocking(generate_passwords).await?;
    for password in passwords {
        write!(message, "\n`{password}`").unwrap();
    }
    bot.send_message(msg.chat.id, message.as_str())
        .parse_mode(ParseMode::MarkdownV2)
        .reply_markup(deletion_markup())
        .await?;
    Ok(())
}