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

pub fn menu_markup_sync(
    command: &str,
    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 = command.to_owned();
            data.reserve(44);
            data.push(' ');
            B64_ENGINE.encode_string(hash, &mut data);
            InlineKeyboardButton::callback(name, data)
        })
        .chunks(3);

    InlineKeyboardMarkup::new(&names)
}

pub async fn menu_markup(
    command: impl Into<String> + Send,
    user_id: u64,
    db: &Pool,
) -> crate::Result<InlineKeyboardMarkup> {
    let command: String = command.into();
    let names: Vec<String> = Account::get_names(user_id, db).try_collect().await?;

    spawn_blocking(move || menu_markup_sync(&command, names))
        .await
        .map_err(Into::into)
}

fn make_button(text: &str, command: &str, param: &str) -> InlineKeyboardButton {
    let mut data = command.to_owned();
    data.reserve(param.len() + 1);
    data.push(' ');
    data.push_str(param);
    InlineKeyboardButton::callback(text, data)
}

pub fn account_markup(name: &str, is_encrypted: bool, locale: LocaleRef) -> 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 encryption_button = if is_encrypted {
        (&locale.decrypt_button, "decrypt")
    } else {
        (&locale.hide_button, "get")
    };

    let main_buttons = [
        (&locale.change_name_button, "an"),
        (&locale.change_login_button, "al"),
        (&locale.change_password_button, "ap"),
        (&locale.delete_account_button, "delete0"),
        encryption_button,
    ]
    .into_iter()
    .map(|(text, command)| make_button(text, command, hash))
    .chunks(2);

    let menu_button = InlineKeyboardButton::callback(&locale.menu_button, "get_menu");

    InlineKeyboardMarkup::new(&main_buttons).append_row([menu_button])
}

pub fn language_markup() -> InlineKeyboardMarkup {
    let languages = [("🇷🇺 Русский", "ru"), ("🇬🇧 English", "en")]
        .into_iter()
        .map(|(text, param)| make_button(text, "change_locale", param))
        .chunks(2);
    InlineKeyboardMarkup::new(&languages)
}

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