use crate::{db::db, gui::question, space_repetition, util::event::Events};
use anyhow::Result;
use rusqlite::Connection;
use std::io;
use termion::{raw::IntoRawMode, screen::AlternateScreen};
use tui::{backend::TermionBackend, Terminal};

pub fn start(conn: &Connection) -> Result<()> {
    let stdout = io::stdout().into_raw_mode()?;
    let stdout = AlternateScreen::from(stdout);
    let backend = TermionBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    let events = Events::new();

    loop {
        match db::pick_ready(&conn) {
            Some(card) => {
                let difficulty =
                    question::ask(&mut terminal, &events, &card, "German".to_string())?;
                db::update(
                    &conn,
                    &card.question,
                    &space_repetition::update(card.state, difficulty),
                )?;
            }
            None => {
                break;
            }
        }
    }

    Ok(())
}