use crate::prelude::*;
use base64::{engine::general_purpose::STANDARD_NO_PAD as B64_ENGINE, Engine as _};
use itertools::Itertools;
use sha2::{Digest, Sha256};
use teloxide::types::{InlineKeyboardButton, InlineKeyboardMarkup, KeyboardButton, KeyboardMarkup};
use tokio::task::spawn_blocking;

/// Creates a markup of all user's account names
#[inline]
pub async fn account_list_markup(
    user_id: u64,
    db: &DatabaseConnection,
) -> crate::Result<KeyboardMarkup> {
    let account_names: Vec<Vec<KeyboardButton>> = Account::get_names(user_id, db)
        .await?
        .map_ok(KeyboardButton::new)
        .try_chunks(3)
        .map_err(|err| err.1)
        .try_collect()
        .await?;
    let markup = KeyboardMarkup::new(account_names)
        .resize_keyboard(true)
        .one_time_keyboard(true);
    Ok(markup)
}

#[inline]
pub fn menu_markup_sync(names: impl IntoIterator<Item = String>) -> InlineKeyboardMarkup {
    let names = names
        .into_iter()
        .map(|name| {
            let hash = <Sha256 as Digest>::digest(name.as_bytes());
            let mut data = "get ".to_owned();
            data.reserve(43);
            B64_ENGINE.encode_string(hash, &mut data);
            InlineKeyboardButton::callback(name, data)
        })
        .chunks(3);

    InlineKeyboardMarkup::new(&names)
}

#[inline]
pub async fn menu_markup(
    user_id: u64,
    db: &DatabaseConnection,
) -> crate::Result<InlineKeyboardMarkup> {
    let names: Vec<String> = Account::get_names(user_id, db).await?.try_collect().await?;

    spawn_blocking(|| menu_markup_sync(names))
        .await
        .map_err(Into::into)
}

#[inline]
fn make_button(text: &str, command: &str, hash: &str) -> InlineKeyboardButton {
    let mut data = command.to_owned();
    data.reserve(44);
    data.push(' ');
    data.push_str(hash);
    InlineKeyboardButton::callback(text, data)
}

#[inline]
pub fn account_markup(name: &str, is_encrypted: bool) -> InlineKeyboardMarkup {
    let mut hash = [0; 43];
    B64_ENGINE
        .encode_slice(<Sha256 as Digest>::digest(name), &mut hash)
        .unwrap();
    let hash = std::str::from_utf8(&hash).unwrap();

    let alter_buttons = [
        ("Alter name", "an"),
        ("Alter login", "al"),
        ("Alter password", "ap"),
    ]
    .map(|(text, command)| make_button(text, command, hash));

    let mut second_raw = Vec::new();
    if is_encrypted {
        second_raw.push(make_button("Decrypt", "decrypt", hash))
    } else {
        second_raw.push(make_button("Hide", "hide", hash));
    }
    second_raw.push(make_button("Delete account", "delete", hash));

    let menu_button = InlineKeyboardButton::callback("Back to the menu", "get_menu");

    InlineKeyboardMarkup::new([alter_buttons])
        .append_row(second_raw)
        .append_row([menu_button])
}

/// Creates a markup with a "Delete message" button.
/// This markup should be added for all messages that won't be deleted afterwards
#[inline]
pub fn deletion_markup() -> InlineKeyboardMarkup {
    let button = InlineKeyboardButton::callback("Delete message", "delete_message");
    InlineKeyboardMarkup::new([[button]])
}