mod format;
mod icon;
mod notification;

use std::io::Write;
use std::process::{Command, Stdio};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let notifications = notification::history()?;
    if notifications.is_empty() {
        return Ok(());
    }

    let entries: Vec<String> = notifications
        .iter()
        .map(|n| {
            let app_name = n.app_name.as_deref().unwrap_or("unknown");
            let summary = n.summary.as_deref().unwrap_or("");
            let body = n.body.as_deref().unwrap_or("");
            let text = format::entry_text(app_name, summary, body);

            match icon::resolve(
                n.app_icon.as_deref(),
                n.desktop_entry.as_deref(),
                n.app_name.as_deref(),
            ) {
                Some(path) => format!("img:{}:text:{text}", path.display()),
                None => text,
            }
        })
        .collect();

    let Some(index) = prompt_selection(&entries)? else {
        return Ok(());
    };

    if let Some(notification) = notifications.get(index) {
        notification::invoke(notification.id)?;
    }

    Ok(())
}

/// Run wofi in dmenu mode with the given entries and return the selected
/// index, or `None` if the user cancelled (Escape / clicked outside).
fn prompt_selection(entries: &[String]) -> Result<Option<usize>, Box<dyn std::error::Error>> {
    let mut child = Command::new("wofi")
        .args([
            "--dmenu",
            "-p",
            "Notifications",
            "-D",
            "dmenu-print_line_num=true",
        ])
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .spawn()?;

    let mut stdin = child.stdin.take().expect("stdin was piped");
    stdin.write_all(entries.join("\n").as_bytes())?;
    drop(stdin);

    let output = child.wait_with_output()?;
    if !output.status.success() {
        return Ok(None);
    }

    let selection = String::from_utf8(output.stdout)?;
    let selection = selection.trim();
    if selection.is_empty() {
        return Ok(None);
    }

    Ok(selection.parse::<usize>().ok())
}