use anki_bridge::{AnkiClient, AnkiRequestable, prelude::*};
use crossterm::{
    cursor::*,
    event::{self, Event, KeyCode},
    execute,
    style::*,
    terminal::*,
};
use nanohtml2text::html2text;
use std::io::stdout;

const GOOD: char = '3';
const AGAIN: char = '1';

fn main() {
    let anki = AnkiClient::default();
    init(&anki);
    loop {
        prompt(&anki);
    }
}

fn init(anki: &AnkiClient) {
    clear_screen();
    display_prompt_text("Name des Stapels: ");
    let mut input = "".to_string();
    loop {
        match event::read().unwrap() {
            Event::Key(e) => match e.code {
                KeyCode::Char(c) => input = input + &c.to_string(),
                KeyCode::Enter => break,
                _ => (),
            },
            _ => (),
        }
    }
    anki.request(GuiDeckReviewRequest { name: input }).unwrap();
}

fn prompt(anki: &AnkiClient) {
    let card = anki.request(GuiCurrentCardRequest {}).unwrap();
    clear_screen();
    display_html(&card.question);
    loop {
        match event::read().unwrap() {
            Event::Key(e) => match e.code {
                KeyCode::Enter => break,
                _ => (),
            },
            e => (),
        };
    }
    anki.request(GuiShowAnswerRequest {}).unwrap();
    clear_screen();
    {
        let length = html2text(&card.question).len();
        let text = &html2text(&card.answer)[(2 + length)..];
        display_text(&text);
    }
    display_prompt_text(":");
    let ease = loop {
        let ease = match event::read().unwrap() {
            Event::Key(e) => match e.code {
                KeyCode::Char(AGAIN) => break Ease::Again,
                KeyCode::Char(GOOD) => break Ease::Good,
                _ => (),
            },
            e => (),
        };
    };
    anki.request(GuiAnswerCardRequest { ease: ease }).unwrap();
    event::read().unwrap();
}

fn clear_screen() {
    execute!(stdout(), Clear(ClearType::All), MoveTo(0, 0));
}

fn display_prompt_text(text: &str) {
    execute!(
        stdout(),
        SetForegroundColor(Color::Blue),
        Print(text),
        ResetColor
    );
}

fn display_html(html: &str) {
    let text = html2text(html);
    display_text(&text);
}

fn display_text(text: &str) {
    execute!(
        stdout(),
        SetForegroundColor(Color::DarkYellow),
        Print(text),
        ResetColor
    );
}