//! Overlay: inline editor mode — shows the current input buffer with cursor
//! position and save/dismiss key hints.
//!
//! Flow: reads `state.input.buffer` and `state.input.cursor` every frame to
//! display a live preview of what the user is editing.

use ratatui::style::{Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Paragraph};
use ratatui::Frame;
use crate::view::theme::Theme;
use tracing;

/// Render the Editor overlay — buffer preview with cursor position.
pub fn render(
    frame: &mut Frame,
    area: ratatui::layout::Rect,
    block: Block<'static>,
    state: &crate::app::state::rest::AppStateRest,
) {
    tracing::debug!("overlay: Editor (buffer_len={}, cursor={})", state.input.buffer.len(), state.input.cursor);
    let block = block
        .title(Span::styled(
            " Editor ",
            Style::default()
                .fg(Theme::PRIMARY)
                .add_modifier(Modifier::BOLD),
        ))
        .border_style(Style::default().fg(Theme::PRIMARY));
    let lines = vec![
        Line::from(Span::styled(
            "  Editor Mode — Ctrl+S save, Esc dismiss",
            Style::default()
                .fg(Theme::TEXT_MUTED)
                .add_modifier(Modifier::ITALIC),
        )),
        Line::from(Span::raw("")),
        Line::from(Span::styled(
            "  Buffer:",
            Style::default().fg(Theme::TEXT_DIM),
        )),
        Line::from(Span::styled(
            format!("  {}", state.input.buffer),
            Style::default().fg(Theme::TEXT),
        )),
        Line::from(Span::raw("")),
        Line::from(Span::styled(
            format!(
                "  Cursor: pos {} / {}",
                state.input.cursor,
                state.input.buffer.len()
            ),
            Style::default().fg(Theme::TEXT_DIM),
        )),
    ];
    let paragraph = Paragraph::new(lines).block(block);
    frame.render_widget(paragraph, area);
}