#!/bin/bash
# Installation Script
#
# Install dependencies
dpkg --add-architecture i386
apt update
apt -y --no-install-recommends install curl jq unzip libstdc++6 ca-certificates libsdl2-2.0-0:i386

## Get latest Nitrox-Mod build
## get release info and download links
GITHUB_PACKAGE="SubnauticaNitrox/Nitrox"
VERSION=${NITROX_VERSION}
MATCH="Nitrox"

LATEST_JSON=$(curl --silent "https://api.github.com/repos/${GITHUB_PACKAGE}/releases/latest")
RELEASES=$(curl --silent "https://api.github.com/repos/${GITHUB_PACKAGE}/releases")

# arch detection
_arch=$(uname -m)
case "${_arch}" in
  x86_64|amd64) ARCH_TAG="linux_x64" ;;
  aarch64|arm64) ARCH_TAG="linux_arm64" ;;
  *) ARCH_TAG="linux_x64" ;;
esac

select_asset_url() {
  local json="$1"
  local arch_tag="$2"
  url=$(echo "$json" | jq -r --arg arch "$arch_tag" '.assets[] | select(.name != null) | select((.name | test($arch; "i"))) | .browser_download_url' | head -n1)
  if [ -z "$url" ]; then
    url=$(echo "$json" | jq -r '.assets[] | select(.name | test("linux"; "i")) | .browser_download_url' | head -n1)
  fi
  if [ -z "$url" ]; then
    url=$(echo "$json" | jq -r '.assets[0].browser_download_url')
  fi
  printf "%s" "$url"
}

if [ -z "${VERSION}" ] || [ "${VERSION}" == "latest" ]; then
  RELEASE_JSON="${LATEST_JSON}"
  DOWNLOAD_URL=$(select_asset_url "$RELEASE_JSON" "$ARCH_TAG")
else
  RELEASE_JSON=$(echo "${RELEASES}" | jq -c --arg VERSION "$VERSION" '.[] | select(.tag_name == $VERSION)' )
  if [ -z "$RELEASE_JSON" ]; then
    echo "Requested Nitrox version ${VERSION} not found, defaulting to latest"
    RELEASE_JSON="${LATEST_JSON}"
  fi
  DOWNLOAD_URL=$(select_asset_url "$RELEASE_JSON" "$ARCH_TAG")
fi

if [ -z "$DOWNLOAD_URL" ] || [ "$DOWNLOAD_URL" == "null" ]; then
  echo "Could not determine Nitrox download URL. Dumping available assets for debugging:"
  echo "${RELEASE_JSON}" | jq '.assets[] | {name: .name, url: .browser_download_url}'
  exit 1
fi

## download and install steamcmd
cd /tmp
mkdir -p /mnt/server/steamcmd
curl -sSL -o steamcmd.tar.gz https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz
tar -xzvf steamcmd.tar.gz -C /mnt/server/steamcmd
cd /mnt/server/steamcmd

chown -R root:root /mnt
export HOME=/mnt/server


## Install game using steamcmd
GUARDCODE="${STEAM_GUARDCODE}"
if [ -z $GUARDCODE ]
then
    echo ""
    echo "### You did not specify a Steam Guardcode"
    echo "### A new one should be send to you shortly"
    echo "### Enter it in the startup-config after this installation is finished and reinstall the Server"
    sleep 10
    timeout 60 ./steamcmd.sh +login ${STEAM_USERNAME} ${STEAM_PASSWORD} +quit
    exit 1
fi

[ ! -d "$HOME/subnautica" ] && mkdir $HOME/subnautica
./steamcmd.sh +set_steam_guard_code ${STEAM_GUARDCODE} +login ${STEAM_USERNAME} ${STEAM_PASSWORD} +@sSteamCmdForcePlatformType windows +force_install_dir $HOME/subnautica +app_update ${APPID} ${EXTRA_FLAGS} validate +quit
status=$?

if [ $status -ne 0 ]
then
    echo ""
    echo "### The Download was not successful"
    echo "### Probably the entered Guardcode was wrong"
    echo "### A new one should be send to you shortly"
    echo "### Enter it in the startup-config after this installation is finished and reinstall the Server"
    sleep 10
    sleep 10
    timeout 30 ./steamcmd.sh +login ${STEAM_USERNAME} ${STEAM_PASSWORD} +quit
    exit 1
fi


## set up 32 bit libraries
mkdir -p $HOME/.steam/sdk32
cp -v linux32/steamclient.so ../.steam/sdk32/steamclient.so

## set up 64 bit libraries
mkdir -p $HOME/.steam/sdk64
cp -v linux64/steamclient.so ../.steam/sdk64/steamclient.so

## Download and extract Nitrox
[ -d "$HOME/nitrox" ] && rm -rf "$HOME/nitrox"
mkdir -p "$HOME/nitrox"
cd "$HOME/nitrox"

curl -sL "$DOWNLOAD_URL" -o Nitrox.zip
unzip -q Nitrox.zip
rm Nitrox.zip

# move contents from the first directory (e.g., linux-x64) to here
FIRST_DIR=$(find . -mindepth 1 -maxdepth 1 -type d | head -n 1)
if [ -n "$FIRST_DIR" ]; then
  mv "$FIRST_DIR"/* "$HOME/nitrox"/
  rm -rf "$FIRST_DIR"
fi

## make everything inside nitrox executable
chmod -R +x "$HOME/nitrox" || true

## create config directory
mkdir $HOME/.config


## Create path files to Subnautica Install-Dir. Needed for versions pre 1.6.0
echo "/home/container/subnautica" > $HOME/path.txt


## Create config
if [ -e $HOME/server.cfg ]; then
    echo "server settings exists"
else
    echo "writing server default settings"
    cat <<EOT > $HOME/server.cfg
    # Server settings can be changed here
    # Set to true to Cache entities for the whole map on next run. 
    # WARNING! Will make server load take longer on the cache run but players will gain a performance boost when entering new areas.
    CreateFullEntityCache=False
    # Leave blank for a random spawn position
    Seed=
    ServerPort=11000
    # Measured in milliseconds
    SaveInterval=120000
    # Command to run following a successful world save (e.g. .exe, .bat, or PowerShell script). 
    PostSaveCommandPath=
    MaxConnections=100
    InitialSyncTimeout=300000
    DisableConsole=False
    DisableAutoSave=False
    SaveName=world
    ServerPassword=
    AdminPassword=PleaseChangeMe
    # Possible values: SURVIVAL, FREEDOM, HARDCORE, CREATIVE
    GameMode=SURVIVAL
    # Possible values: PROTOBUF, JSON
    SerializerMode=JSON
    # Possible values: NONE, PLAYER, MODERATOR, ADMIN, CONSOLE
    DefaultPlayerPerm=PLAYER
    #
    # Default player stats below here
    DefaultOxygenValue=45
    DefaultMaxOxygenValue=45
    DefaultHealthValue=80
    DefaultHungerValue=50.5
    DefaultThirstValue=90.5
    # Recommended to keep at 0.1f which is the default starting value. If set to 0 then new players are cured by default.
    DefaultInfectionValue=0.1
    # If set to true, the server will try to open port on your router via UPnP
    AutoPortForward=False
EOT
fi