use std::io::Error;

use crossterm::event::KeyCode;
use tui::layout::Rect;

use crate::pane::{Message, Pane};
use crate::directory::Directory;
use crate::terminal::Terminal;

pub struct State {
    panes: Vec<Box<dyn Pane>>,
    selected: usize,
}
impl State {
    pub fn new() -> Self {
        Self {
            panes: vec![ Box::new( Directory::new("root".into()) ) ],
            selected: 0,
        }
    }

    pub fn render(&self, terminal: &mut Terminal, area: Rect) -> Result<(), Error> {
        terminal.draw(
            |output| 
            self.panes
                .iter()
                .for_each(|p| p.display(output, area))
        )?;

        Ok(())
    }

    pub fn cursor_position(&self) -> Option<(u16, u16)> {
        self.panes[self.selected].cursor_position()
    }

    pub fn update(&mut self, key: KeyCode) -> Message {
        self.panes[self.selected].update(key)
    }
}