#!/usr/bin/env bash
# share terminal session in read-only mode

# exit if a command fails
set -o errexit

# exit if required variables are not set
set -o nounset

# return the exit status of the final command before a failure
set -o pipefail

# check for dependencies
script_commands="gotty tmux"
missing_counter=0
for needed_command in ${script_commands}; do
  if ! hash "${needed_command}" >/dev/null 2>&1; then
    printf "Command not found in PATH: %s\n" "${needed_command}" >&2
    ((missing_counter++))
  fi
done
if ((missing_counter > 0)); then
  printf "Minimum %d commands are missing in PATH, aborting.\n" "${missing_counter}" >&2
  exit 1
fi

## configure gotty
# listen port
listen_port="${listen_port:-"1338"}"

# tab name
gotty_title="${gotty_title:-"Watch Me!"}"

# kill any existing tmux session, and start a new one
tmux has-session -t watchme && tmux kill-session -t watchme && echo "Killed old tmux session..." >/dev/null 2>&1
tmux -2 new-session -d -s watchme
echo "Created new tmux session..."

# disable automatic renaming
tmux set-option -g allow-rename off

# only resize the pane if a smaller client is actively looking at it
tmux set-option -g aggressive-resize on

# run gotty in window 0
tmux rename-window -t watchme:0 'GoTTY'
tmux select-window -t watchme:0
tmux send-keys "gotty --title-format "${gotty_title}" --port "${listen_port}" -- tmux a -t watchme" C-m
echo "Launched GoTTY..."

# broadcast terminal in window 1
tmux new-window -t watchme:1 -n "${gotty_title}"
tmux select-window -t watchme:1

# connect to the tmux session and show off
tmux a -t watchme