#!/bin/bash --posix

usage() {
  printf "%s\n" \
"Usage: $(basename "${0}") -s <server id> -n | $(basename "${0}") -s <server id> -u <steam username>
  --user <steam username> | -u <steam username>
    The username used to login for steam

    Example:
      --user Sbinalla
    Note:
      Only required when --no-update is not passed
  --server <server number> | -s <server number>
    The server number (the ID of the server within the Arma directory)

    Example:
      --server 0
  --no-update | -n
    Skips the steam update and validation and just starts the server

    Example:
      --no-update"
}

error() {
  printf "\n%s\n" "$1" >&2
  exit 1
}

confirmation() {
  while true; do
    read -p "${1}" -n 1 -r choice
    case "$choice" in
    y | Y) return 1 ;;
    n | N) return 0 ;;
    *) echo -e "\nInput must be either y, Y, n, or N" ;;
    esac
  done
}

servernum=""
steamuser=""
no_update=0
use_checksum=0

while :; do
  case $1 in
  -h | -\? | --help)
    usage # Display a usage synopsis.
    exit
    ;;
  --) # End of all options.
    shift
    break
    ;;
  -s | --server)
    shift
    servernum="${1}"
    ;;
  -u | --user)
    shift
    steamuser="${1}"
    ;;
  -n | --no-update)
    no_update=1
    ;;
  -f | --force-checksum)
    use_checksum=0
    ;;
  -?*)
    printf 'Unknown option: %s\n' "$1" >&2
    usage
    error
    ;;
  *) # Default case: No more options, so break out of the loop.
    break ;;
  esac
  shift
done


[[ "${servernum}" == "" ]] && error "Error: A server number must be provided"
[[ "${servernum}" =~ [^0-9]+. ]] && error "Error: The argument for server must be a number"

[[ "${steamuser}" == "" && ${no_update} == 0 ]] && error "Error: A steam user must be provided"


[[ -d ~/Arma/ ]] || \
  mkdir -p ~/Arma/ && echo "Created the Arma directory..."

if [ ${no_update} == 0 ]; then
  steamcmd +quit
  steamcmd +login "${steamuser}" +force_install_dir ~/Arma/Server-"${servernum}" +app_update 233780 validate +quit
fi

[[ -d ~/Arma/Server-"${servernum}"/mods ]] || \
  mkdir ~/Arma/Server-"${servernum}"/mods && echo "Creating new mods directory"

# These directories are necessary for Arma servers on linux
[[ -d  ~/".local/share/Arma 3" ]] || \
  mkdir -p ~/".local/share/Arma 3" && echo "Created the Arma 3 share"
[[ -d ~/".local/share/Arma 3 - Other Profiles" ]] || \
  mkdir -p ~/".local/share/Arma 3 - Other Profiles" && echo "Created the Arma 3 Other Profiles"


for fd in $(find /home/Arma/Arma/Server-"${servernum}"/mods/); do
  new_name="$(echo "$(basename "${fd}")" | tr '[:upper:]' '[:lower:]')"
  new_name="${new_name//-/$''}"
  new_name="${new_name// /$'_'}"
  dir="$(dirname "${fd}")"
  mv "${fd}" "${dir}/${new_name}" 2>/dev/null
done

MODS=""
MODPATH=~/Arma/Server-"${servernum}"/mods
for mod in $(ls "${MODPATH}")
do
  echo "Adding mod ${mod}"
  MODS="${MODS}mods/${mod};"
  echo "Successfully added mod ${mod}"
done

echo "Mods added to startup: ${MODS}"

SERVERPORT=$(("5" * "${servernum}"))
SERVERPORT=$(("2300" + "${SERVERPORT}"))

cd ~/Arma/Server-"${servernum}"

tmux has-session -t "Arma-Server-${servernum}" 2>/dev/null
if [ ${?} != 0 ]; then
  echo \
"Startup Args:
  -name=Arma-Server-${servernum}
  -config=server.cfg
  -noSound
  -port=${SERVERPORT}
  -mod=\"${MODS}\""
  echo "Starting new session..."

  tmux new-session -d -s \
    "Arma-Server-${servernum}" \
      ~/Arma/Server-"${servernum}"/arma3server_x64 \
        -name=Arma-Server-${servernum} -config=server.cfg -noSound -port=${SERVERPORT} -mod="${MODS}"
else
  echo "The session Arma-Server-${servernum} already exists, please close it before running a new session"
  exit 1
fi