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

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

use super::{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,
            "{fr}{}",
            env.frame.writeln(&format!("Event: {}", event), 1, 1),
            fr = env.primary_frame(),
        )?;
        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(&self, env: Environment, screen: &mut RawTerminal<Stdout>) -> Result<()> {
        write!(
            screen,
            "{hide}{clear}{fr}{cursor}",
            hide = cursor::Hide,
            fr = env.frame.frame_str(&env.theme, env.theme.primary()),
            cursor = env.frame.goto(0, 0),
            clear = clear::All
        )?;
        screen.flush()?;
        Ok(())
    }
}

#[derive(Debug, Clone, Default)]
struct SigninPage {
    hostname: String,
    username: String,
    cursor: SigninCursorLocation,
}

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

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

impl SigninPage {
    fn frame_string() -> String {
        format!("")
    }
}

impl Page for SigninPage {
    fn receive_event(
        &mut self,
        env: Environment,
        screen: &mut RawTerminal<Stdout>,
        event: Event,
    ) -> Result<()> {
        Ok(())
    }

    fn init(&self, env: Environment, screen: &mut RawTerminal<Stdout>) -> Result<()> {
        write!(
            screen,
            "{frame}{hide_cursor}",
            frame = env.frame.frame_str(&env.theme, env.theme.primary()),
            hide_cursor = cursor::Hide,
        )?;
        screen.flush()?;

        Ok(())
    }
}