use tui::widgets::{Block, Borders, Paragraph};

use crate::pane::prelude::*;

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct Command {
    buf: String
}
impl Command {
    pub const fn new() -> Self {
        Self { buf: String::new() }
    }

    pub fn buf(&self) -> &str { &self.buf }
}
impl Pane for Command {
    fn cursor_position(&self) -> Option<(u16, u16)> {
        let x = u16::try_from(self.buf.len())
            .expect("too big to display");
        let y = 0;
        Some((x, y))
    }

    fn lines_hint(&self) -> usize {
        1
    }

    fn display(&self, output: OutputSink, area: Rect) {
        let widget = Paragraph::new(self.buf.as_str())
            .block(Block::default().title("Command").borders(Borders::all()));
        
        output.render_widget(widget, area);
    }

    fn update(&mut self, key: KeyCode) -> Message {
        match key {
            KeyCode::Char(c) => { self.buf.push(c); Message::Nothing },
            KeyCode::Backspace => { self.buf.pop(); Message::Nothing },
            KeyCode::Esc => Message::CancelCommand,
            KeyCode::Enter => Message::ExecuteCommand,
            _ => Message::Nothing,
        }
    }
}