//! The Placeholders window: every `[TODO]`/`[TK]`/`[???]`-style marker left
//! in the manuscript, so a fast first-draft pass doesn't lose track of the
//! gaps it left behind.

use super::*;
use crate::placeholder_scan::find_placeholders;

impl App {
    /// The Placeholders window: one row per marker found, grouped by file in
    /// manuscript order. Clicking a row jumps straight to it.
    pub(super) fn placeholders_window(&mut self, ctx: &egui::Context) {
        let mut open = self.show_placeholders;

        // Collect up front (reads the in-memory buffer for the open file,
        // disk for the rest), so the window closure only reads.
        let selected_name = self.selected.and_then(|i| self.files.get(i)).cloned();
        let rows: Vec<(String, Vec<crate::placeholder_scan::Placeholder>)> = self
            .manuscript_files()
            .into_iter()
            .filter_map(|(_, name)| {
                let raw = if Some(name) == selected_name.as_ref() {
                    self.document().into_owned()
                } else {
                    std::fs::read_to_string(self.path_for(name)).unwrap_or_default()
                };
                let found = find_placeholders(&raw);
                if found.is_empty() {
                    None
                } else {
                    Some((name.clone(), found))
                }
            })
            .collect();
        let total: usize = rows.iter().map(|(_, m)| m.len()).sum();

        let mut jump_to: Option<(String, usize, usize)> = None;

        egui::Window::new("Placeholders")
            .open(&mut open)
            .resizable(true)
            .collapsible(false)
            .default_width(480.0)
            .default_height(420.0)
            .show(ctx, |ui| {
                ui.label(
                    egui::RichText::new(
                        "Bracketed markers like [TODO], [TK], [FIXME] or [???] left in \
                         the draft. Click one to jump to it.",
                    )
                    .small()
                    .weak(),
                );
                ui.separator();
                egui::ScrollArea::vertical()
                    .auto_shrink([false, false])
                    .show(ui, |ui| {
                        if total == 0 {
                            ui.label("No placeholders found — 🎉");
                            return;
                        }
                        for (name, found) in &rows {
                            ui.label(egui::RichText::new(name).strong());
                            for marker in found {
                                if ui
                                    .link(format!("  line {} · [{}]", marker.line, marker.marker))
                                    .clicked()
                                {
                                    jump_to = Some((name.clone(), marker.start, marker.end));
                                }
                            }
                            ui.add_space(4.0);
                        }
                    });
            });

        if let Some((name, start, end)) = jump_to {
            if let Some(idx) = self.files.iter().position(|f| *f == name) {
                self.select(idx);
                self.issue_jump = Some((start, end));
            }
        }
        self.show_placeholders = open;
    }
}