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use std::{
    convert::{TryFrom, TryInto},
    fmt,
    io::{self, stdin, Stdin},
};

use termion::{
    event,
    input::{self, TermRead},
};

use super::EventIterator;

/// An iterator over the input keys using the `termion` crate
#[cfg_attr(docsrs, doc(cfg(feature = "termion")))]
pub struct TermionEvents {
    events: input::Keys<Stdin>,
}

struct Dash;

impl fmt::Debug for Dash {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str("_")
    }
}

impl fmt::Debug for TermionEvents {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("TermionEvents")
            .field("events", &Dash)
            .finish()
    }
}

impl TermionEvents {
    /// Creates a new `TermionEvents` using stdin
    pub fn new() -> Self {
        Self {
            events: stdin().keys(),
        }
    }
}

impl Default for TermionEvents {
    fn default() -> Self {
        Self::new()
    }
}

impl EventIterator for TermionEvents {
    fn next_event(&mut self) -> io::Result<super::KeyEvent> {
        let e = self
            .events
            .next()
            .expect("TermionEvents ran out of user input!?")?;
        e.try_into()
    }
}

impl TryFrom<event::Key> for super::KeyEvent {
    type Error = io::Error;

    fn try_from(key: event::Key) -> io::Result<super::KeyEvent> {
        let key = match key {
            event::Key::Backspace => super::KeyCode::Backspace.into(),
            event::Key::Left => super::KeyCode::Left.into(),
            event::Key::Right => super::KeyCode::Right.into(),
            event::Key::Up => super::KeyCode::Up.into(),
            event::Key::Down => super::KeyCode::Down.into(),
            event::Key::Home => super::KeyCode::Home.into(),
            event::Key::End => super::KeyCode::End.into(),
            event::Key::PageUp => super::KeyCode::PageUp.into(),
            event::Key::PageDown => super::KeyCode::PageDown.into(),
            event::Key::BackTab => super::KeyCode::BackTab.into(),
            event::Key::Delete => super::KeyCode::Delete.into(),
            event::Key::Insert => super::KeyCode::Insert.into(),
            event::Key::F(n) => super::KeyCode::F(n).into(),
            event::Key::Char('\n') => super::KeyCode::Enter.into(),
            event::Key::Char('\t') => super::KeyCode::Tab.into(),
            event::Key::Char(c) => super::KeyCode::Char(c).into(),
            event::Key::Alt(c) => parse_char(c, super::KeyModifiers::ALT)?,
            event::Key::Ctrl(c) => parse_char(c, super::KeyModifiers::CONTROL)?,
            event::Key::Null => super::KeyCode::Null.into(),
            event::Key::Esc => super::KeyCode::Esc.into(),
            _ => unreachable!(),
        };

        Ok(key)
    }
}

fn parse_char(mut c: char, mut modifiers: super::KeyModifiers) -> io::Result<super::KeyEvent> {
    let code = loop {
        if c as u32 >= 256 {
            break super::KeyCode::Char(c);
        }

        let k = match event::parse_event(c as u8, &mut std::iter::empty())? {
            event::Event::Key(k) => k,
            _ => match char::try_from(c as u32) {
                Ok(c) => break super::KeyCode::Char(c),
                Err(_) => {
                    return Err(io::Error::new(
                        io::ErrorKind::Other,
                        "Could not parse an event",
                    ))
                }
            },
        };

        match k {
            event::Key::Backspace => break super::KeyCode::Backspace,
            event::Key::Left => break super::KeyCode::Left,
            event::Key::Right => break super::KeyCode::Right,
            event::Key::Up => break super::KeyCode::Up,
            event::Key::Down => break super::KeyCode::Down,
            event::Key::Home => break super::KeyCode::Home,
            event::Key::End => break super::KeyCode::End,
            event::Key::PageUp => break super::KeyCode::PageUp,
            event::Key::PageDown => break super::KeyCode::PageDown,
            event::Key::BackTab => break super::KeyCode::BackTab,
            event::Key::Delete => break super::KeyCode::Delete,
            event::Key::Insert => break super::KeyCode::Insert,
            event::Key::F(n) => break super::KeyCode::F(n),
            event::Key::Char('\n') => break super::KeyCode::Enter,
            event::Key::Char('\t') => break super::KeyCode::Tab,
            event::Key::Char(c @ 'A'..='Z') => {
                modifiers |= super::KeyModifiers::SHIFT;
                break super::KeyCode::Char(c);
            }
            event::Key::Char(c) => break super::KeyCode::Char(c),
            event::Key::Alt(new_c) => {
                modifiers |= super::KeyModifiers::ALT;
                c = new_c
            }
            event::Key::Ctrl(new_c) => {
                modifiers |= super::KeyModifiers::CONTROL;
                c = new_c
            }
            event::Key::Null => break super::KeyCode::Null,
            event::Key::Esc => break super::KeyCode::Esc,
            _ => unreachable!(),
        }
    };

    Ok(super::KeyEvent::new(code, modifiers))
}