#!/bin/bash
# constants
code_clear=$'\x05\x15'
code_send=$'\r'

die () {
	echo "$@"
	exit 1
}

# directories
mcserver_root="${XDG_DATA_HOME:-${HOME}/.local/share}/mcserver"
instances_dir="$mcserver_root/instances"

mkdir -p "$instances_dir"

cmd="$1"
shift

instance="$1"
shift

instance_dir="$instances_dir/$instance"


# input checks
if [[ -z "${cmd:+x}" ]] ; then
	die "Please specify one of start, stop, or command."
fi

if [[ -z "${instance:+x}" ]] ; then
	die "Please specify an instance."
fi

if ! [[ -d "$instance_dir" ]] ; then
	die "Instance \`$instance\` does not exist. Please create it first."
fi

cd "$instance_dir"

if ! [[ -e ./vars ]] ; then
	die 'Please create a "vars" file using "vars.example" as a template.'
fi
source ./vars

case "$cmd" in
	stop) tmux send-keys -t "$TMUX_SESSION" -l "$code_clear" 'stop' "$code_send" ;;
	command) tmux send-keys -t "$TMUX_SESSION" -l "$code_clear" "$*" "$code_send" ;;
	start|*) tmux new-window -t $TMUX_SESSION: "./start.sh" || tmux new-session -s $TMUX_SESSION "./start.sh";;
esac