use std::io::{Stdout, Write};

use termion::{clear, cursor, raw::RawTerminal};

use super::{
    frame::Frame, theme::ColorSet, Environment, Event, Page,
};

type Result<T> = std::result::Result<T, anyhow::Error>;

#[derive(Debug, Clone)]
pub enum Body {
    Echo,
    Signin(SigninPage),
}

impl Body {
    fn echo(
        env: Environment,
        screen: &mut RawTerminal<Stdout>,
        event: Event,
    ) -> Result<()> {
        let event = format!("{}", event);
        write!(
            screen,
            "{theme}{content}",
            theme = env.theme.primary(),
            content =
                env.frame.writeln(&format!("Event: {}", event), 0, 0),
        )?;
        screen.flush()?;
        Ok(())
    }

    fn echo_init(
        &self,
        env: Environment,
        screen: &mut RawTerminal<Stdout>,
    ) -> Result<()> {
        write!(
            screen,
            "{hide}{clear}{fr}{cursor}",
            clear = clear::All,
            hide = cursor::Hide,
            fr = env.frame.frame_str(env.theme.primary()),
            cursor = env.frame.goto(0, 0),
        )?;
        screen.flush()?;
        Ok(())
    }
}

impl Page for Body {
    fn receive_event(
        &mut self,
        env: Environment,
        screen: &mut RawTerminal<Stdout>,
        event: Event,
    ) -> Result<()> {
        match self {
            Body::Signin(b) => b.receive_event(env, screen, event)?,
            Body::Echo => Body::echo(env, screen, event)?,
        };
        Ok(())
    }

    fn init(
        &mut self,
        env: Environment,
        screen: &mut RawTerminal<Stdout>,
    ) -> Result<()> {
        match self {
            Body::Echo => self.echo_init(env, screen),
            Body::Signin(signin) => signin.init(env, screen),
        }
    }
}

#[derive(Debug, Clone, Default)]
pub struct SigninPage {
    hostname: String,
    username: String,
    cursor: SigninCursorLocation,
    cursor_position: u16,
    frame: Option<Frame>,
}

#[derive(Debug, Clone)]
enum SigninCursorLocation {
    Hostname,
    Username,
    Next,
}

impl Default for SigninCursorLocation {
    fn default() -> Self {
        Self::Hostname
    }
}

impl SigninPage {
    #[inline]
    fn draw(&self) -> String {
        let frame = self.frame.unwrap();
        frame.write_centered("login kk", 1)
    }
}

impl Page for SigninPage {
    fn receive_event(
        &mut self,
        env: Environment,
        screen: &mut RawTerminal<Stdout>,
        event: Event,
    ) -> Result<()> {
        match event {
            Event::Key(key) => match key {
                termion::event::Key::Char(_) => {}
                termion::event::Key::Up => {}
                termion::event::Key::Down => {}
                termion::event::Key::Backspace => {}
                termion::event::Key::Delete => {}
                termion::event::Key::Left => {}
                termion::event::Key::Right => {}
                //
                _ => {}
            },
        }

        Ok(())
    }

    fn init(
        &mut self,
        env: Environment,
        screen: &mut RawTerminal<Stdout>,
    ) -> Result<()> {
        self.frame = Some(env.frame.sub(
            env.theme.colors.subwin,
            super::frame::FrameSize::ByPercent(80, 80),
            2,
        ));
        write!(
            screen,
            "{theme}{clear}{frame}{subframe}{hide_cursor}{content}",
            theme = env.theme.frame(),
            clear = clear::All,
            frame = env.frame.frame_str(env.theme.primary()),
            subframe = self
                .frame
                .unwrap()
                .frame_str(ColorSet::default().to_string()),
            hide_cursor = cursor::Hide,
            content = self.draw(),
        )?;
        screen.flush()?;

        Ok(())
    }
}