// Tmux interaction: pane detection and prompt injection.

use std::process::Command;
use std::thread;
use std::time::Duration;
use tracing::info;

/// Find Claude Code's tmux pane by scanning for the "claude" process.
pub fn find_claude_pane() -> Option<String> {
    let out = Command::new("tmux")
        .args([
            "list-panes",
            "-a",
            "-F",
            "#{session_name}:#{window_index}.#{pane_index}\t#{pane_current_command}",
        ])
        .output()
        .ok()?;

    let stdout = String::from_utf8_lossy(&out.stdout);
    for line in stdout.lines() {
        if let Some((pane, cmd)) = line.split_once('\t') {
            if cmd == "claude" {
                return Some(pane.to_string());
            }
        }
    }
    None
}

/// Send a prompt to a tmux pane. Returns true on success.
///
/// Sequence: Escape q C-c C-u (clear input), wait, type message, Enter.
pub fn send_prompt(pane: &str, msg: &str) -> bool {
    let preview: String = msg.chars().take(100).collect();
    info!("SEND [{pane}]: {preview}...");

    let send = |keys: &[&str]| {
        Command::new("tmux")
            .arg("send-keys")
            .arg("-t")
            .arg(pane)
            .args(keys)
            .output()
            .is_ok()
    };

    // Clear any partial input
    if !send(&["Escape", "q", "C-c", "C-u"]) {
        return false;
    }
    thread::sleep(Duration::from_secs(1));

    // Type the message (literal mode so spaces aren't key separators)
    let ok = Command::new("tmux")
        .args(["send-keys", "-t", pane, "-l", msg])
        .output()
        .is_ok();
    if !ok {
        return false;
    }
    thread::sleep(Duration::from_millis(500));

    // Submit
    send(&["Enter"])
}