#!/usr/bin/env bash
# nc-send — send text to a tmux session RELIABLY (bracketed paste), the way a
# raw `send-keys 'msg' Enter` cannot: the Enter is often swallowed by a TUI's
# paste-burst detector and the message just sits in the composer. This uses
# load-buffer + paste-buffer -p, then a burst-flush + Enter to submit.
#
# usage:
#   nc-send <session> "text"              # paste + submit (Enter)
#   nc-send <session> --file PATH         # text from a file
#   nc-send <session> --no-submit "text"  # leave it in the composer, no Enter
set -euo pipefail

# Resolve the real tmux binary (bypass shell aliases/functions).
TMUX_BIN="${TMUX_BIN:-$(command -v tmux || true)}"
[ -n "$TMUX_BIN" ] || { echo "nc-send: tmux not found on PATH (set TMUX_BIN)" >&2; exit 127; }
submit=1; file=""

sess="${1:?usage: nc-send <session> [--file PATH|--no-submit] <text>}"; shift
while [ "$#" -gt 0 ]; do
  case "$1" in
    --no-submit) submit=0; shift ;;
    --file) file="${2:?--file needs a path}"; shift 2 ;;
    --) shift; break ;;
    *) break ;;
  esac
done

if [ -n "$file" ]; then
  [ -f "$file" ] || { echo "nc-send: not a file: $file" >&2; exit 1; }
  src="$file"; cleanup=""
else
  src="$(mktemp)"; cleanup="$src"; printf '%s' "${1:-}" > "$src"
fi
trap '[ -n "$cleanup" ] && rm -f "$cleanup"' EXIT

"$TMUX_BIN" has-session -t "=$sess" 2>/dev/null || { echo "nc-send: no such session: $sess" >&2; exit 1; }

"$TMUX_BIN" load-buffer -b ncsend "$src"
"$TMUX_BIN" paste-buffer -p -t "$sess" -b ncsend   # -p = bracketed paste

if [ "$submit" -eq 1 ]; then
  sleep 0.4
  "$TMUX_BIN" send-keys -t "$sess" C-e             # flush the paste-burst window
  sleep 0.3
  "$TMUX_BIN" send-keys -t "$sess" Enter
fi

echo "nc-send → $sess ($([ "$submit" -eq 1 ] && echo submitted || echo composer))"