#!/usr/bin/env bash
# Detect available agents, prompt with fzf, run the selected one.
# Detaches the client if all panes in the window are dead afterwards.

agents=()
command -v claude &>/dev/null && agents+=(claude)
command -v opencode &>/dev/null && agents+=(opencode)
command -v gemini &>/dev/null && agents+=(gemini)
command -v codex &>/dev/null && agents+=(codex)

if [ ${#agents[@]} -eq 0 ]; then
  echo "No agent commands found (claude, opencode, gemini)"
  exit 1
fi

# Minimize fzf prompt size while centering it.
width=24
height=$((${#agents[@]} + 6))
hmargin=$((($(tput cols) - width) / 2))
vpad=$((($(tput lines) - height) / 2))
[ $hmargin -lt 0 ] && hmargin=0
[ $vpad -lt 0 ] && vpad=0
tput cup "$vpad" 0

agent=$(printf '%s\n' "${agents[@]}" | fzf \
  --prompt='agent> ' \
  --reverse \
  --border=rounded \
  --height="$height" \
  --margin="0,$hmargin" \
  --padding=1)

if [ -n "$agent" ]; then
  "$agent" || true
fi

# Brief delay to let tmux update pane status
sleep 0.1

window_id=$(tmux display-message -p '#{window_id}')
my_pane=$(tmux display-message -p '#{pane_id}')

# Count live sibling panes (not us, not dead)
other_live=$(tmux list-panes -t "$window_id" -F '#{pane_id} #{pane_dead}' \
  | awk -v me="$my_pane" '$1 != me && $2 == "0"' | wc -l | tr -d ' ')

if [ "$other_live" -eq 0 ]; then
  # No live siblings — close the popup and kill the window
  # (also cleans up any dead siblings).
  tmux detach-client
  tmux kill-window -t "$window_id" 2>/dev/null || true
else
  # User has split off other live panes — only kill ours, keep popup open.
  tmux kill-pane 2>/dev/null || true
fi