CONFIG_PATH="$HOME/.config/EnlivenMinetest"
if [ ! -d "$CONFIG_PATH" ]; then
  mkdir -p "$CONFIG_PATH"
fi
RELEASES_PATH="$CONFIG_PATH/cache/releases"
if [ ! -d "$RELEASES_PATH" ]; then
  mkdir -p "$RELEASES_PATH"
fi
GIT_REPOS_PATH="$CONFIG_PATH/cache/git"
if [ ! -d "$GIT_REPOS_PATH" ]; then
  mkdir -p "$GIT_REPOS_PATH"
fi
GIT_BRANCHES_PATH="$CONFIG_PATH/cache/git-branches"
if [ ! -d "$GIT_BRANCHES_PATH" ]; then
  mkdir -p "$GIT_BRANCHES_PATH"
fi

MOD_LIST="$CONFIG_PATH/mod_list.txt"

# * Git version uses /home/*/minetest/games and /usr/local/share/minetest/games but the latter is used for minetestserver (minetest-server package)
# * Arch stable version uses /usr/share/minetest/
if [ "$1" = "--help" ]; then
  echo "This script installs ENLIVEN subgame for minetest. It uses individual git repositories, so please only run this once so as not to exceed their bandwidth."
  echo "Usage:"
  echo
  #echo "version_0_5_enable=<value> (where value is true or false): forces 0.5 (if not specified, this script uses 0.5 versions of mods if minetest is at /usr/local/share/minetest)"
  #echo
  echo "local_enable=<value> (where value is true or false): forces /usr/local/share/minetest (if not specified, script detects minetest but if exists both in /usr/share/ and /usr/local/share, prefers /usr/local/share/minetest)"
  echo
  exit 0
fi

#NOTE: version_0_5_enable is now detected further down instead of being specified
#if [ "$1" = "version_0_5_enable=true" ]; then
#  version_0_5_enable="true"
#elif [ "$2" = "version_0_5_enable=true" ]; then
#  version_0_5_enable="true"
#elif [ "$1" = "version_0_5_enable=false" ]; then
#  version_0_5_enable="false"
#elif [ "$2" = "version_0_5_enable=false" ]; then
#  version_0_5_enable="false"
#fi

if [ "$1" = "local_enable=true" ]; then
  local_enable="true"
#elif [ "$2" = "local_enable=true" ]; then
#  local_enable="true"
elif [ "$1" = "local_enable=false" ]; then
#  local_enable="false"
#elif [ "$2" = "local_enable=false" ]; then
  local_enable="false"
fi
#echo "3..."
#sleep 1
#echo "2..."
#sleep 1
#echo "1..."
#sleep 1
update_enable="true"
shell_name="bash"
err_txt=$HOME/err-enliven.txt
# doesn't work if equal: [ $0 = *"$shell_name"* ]
# could be -bash or bash
#if [ "$0" = "-bash" ]; then
#'[[' doesn't work in debian
show_changes="true"
#[[ doesn't work in debian:
#if [[ $0 == *"$shell_name"* ]]; then
#doesn't work on Fedora since shell_name is blank even when in shell and not pasting:
#if [ "$shell_name" != "" ]; then
  #REPO_PATH="$HOME/GitHub/EnlivenMinetest"
  #echo "You must have pasted this into terminal, so assuming REPO_PATH:"
  #echo "  $REPO_PATH"
#else
  SCRIPT=$(readlink -f "$0")
  if [ "$SCRIPT" = "/bin/bash" ]; then
    SCRIPT=minetestenv.rc
    if [ ! -f "$SCRIPT" ]; then
      echo "ERROR: could not find self (need location of self in order to get SCRIPTPATH and then REPO_PATH in order for patches directory to be found."
      echo "  press Ctrl C to cancel ENLIVEN install or this terminal will close..."
      sleep 1
      echo " 3..."
      sleep 1
      echo " 2..."
      sleep 1
      echo " 1..."
      sleep 1
      exit 1
    fi
  fi
  # Absolute path this script is in, thus /home/user/bin
  SCRIPTPATH=$(dirname "$SCRIPT")
  REPO_PATH="$SCRIPTPATH"
  #formerly, this script was in a subdir:
  #REPO_PATH=$(dirname "$SCRIPTPATH")
#fi

PATCHES_PATH="$REPO_PATH/patches"
echo "PATCHES_PATH: $PATCHES_PATH"
sleep 10

if [ ! -d "$PATCHES_PATH" ]; then
  # maybe moved somewhere or this code was pasted
  PATCHES_PATH=$HOME/GitHub/EnlivenMinetest/patches
fi
if [ ! -d "$PATCHES_PATH" ]; then
  # maybe running from root of repo
  PATCHES_PATH="patches"
fi
if [ ! -d "$PATCHES_PATH" ]; then
  # should work if ran from folder where exists
  PATCHES_PATH="../patches"
fi
if [ ! -d "$PATCHES_PATH" ]; then
  echo
  echo
  echo "ERROR: could not find patches such as in $PATCHES_PATH"
  echo "  press Ctrl C to cancel ENLIVEN install or this terminal will close..."
  sleep 1
  echo " 3..."
  sleep 1
  echo " 2..."
  sleep 1
  echo " 1..."
  sleep 1
  exit 1
fi
# NOTE: minetest mods (other than 0.4.16 client-side mods) are ALWAYS ONLY installed on server, unless you need them for singleplayer
USR_SHARE_MINETEST=/usr/share/games/minetest
try_path="/usr/share/minetest"
if [ -d "$try_path" ]; then
  # Arch linux
  USR_SHARE_MINETEST="$try_path"
fi
if [ "$local_enable" != "false" ]; then
  # IF git version is installed
  try_path="/usr/local/share/minetest"
  if [ -d "$try_path" ]; then
    #if [ -z "$version_0_5_enable" ]; then
    #  version_0_5_enable="true"
    #fi
    USR_SHARE_MINETEST="$try_path"
  fi
fi
version_0_5_enable="false"
if [ -d "$USR_SHARE_MINETEST/games/minetest_game/mods/player_api" ]; then
  version_0_5_enable="true"
fi
if [ -f "$CONFIG_PATH/local_enable" ]; then
  local_enable=$(head -n 1 $CONFIG_PATH/local_enable)
fi
#if [ -f "$CONFIG_PATH/version_0_5_enable" ]; then
#  version_0_5_enable=$(head -n 1 $CONFIG_PATH/version_0_5_enable)
#fi
if [ -z "$local_enable" ]; then
  echo "$local_enable" > "$CONFIG_PATH/local_enable"
fi
#if [ -z "$version_0_5_enable" ]; then
#  echo "$version_0_5_enable" > "$CONFIG_PATH/version_0_5_enable"
#fi

mtgame_name="minetest_game"
MT_MINETEST_GAME_PATH=$USR_SHARE_MINETEST/games/$mtgame_name
#echo "3..."
#sleep 1
#echo "2..."
#sleep 1
#echo "1..."
#sleep 1
# UNUSED (unknown use): MT_GAMES_DIR=$HOME/.minetest/mods
# intentionally skip the slash in the following line since $USR_SHARE_MINETEST already starts with one:
MT_BACKUP_GAMES_DIR=$HOME/Backup$USR_SHARE_MINETEST/games
MT_GAMES_DIR=$USR_SHARE_MINETEST/games
MT_MYGAME_BAK=$USR_SHARE_MINETEST/ENLIVEN_BAK
MT_MYGAME_NAME=ENLIVEN
#$PREFIX/minetest/games/ENLIVEN:
MT_MYGAME_DIR="$MT_GAMES_DIR/$MT_MYGAME_NAME"
# formerly MT_MYGAME_MODDIR:
MT_MYGAME_MODS_PATH="$MT_MYGAME_DIR/mods"
MT_WORLDS_DIR="$HOME/.minetest/worlds"
MT_DEFAULT_WORLD_NAME="`ls $MT_WORLDS_DIR | grep -v tar.gz | grep --max-count=1 -v world`"  # aka -m 1 (no '=' sign in that case)
MT_MYWORLD_NAME="$MT_DEFAULT_WORLD_NAME"
if [ -z "$MT_DEFAULT_WORLD_NAME" ]; then
  #if [ -z "`ls $MT_WORLDS_DIR | grep --max-count=1 -v world`" ]; then
  new_worlds="`ls $MT_WORLDS_DIR | grep --max-count=1 -v '^world$'`"
  if [ ! -z "$new_worlds" ]; then
  # anchors (`^` and `$`) ensure only exact match, so name containing world is not counted as a match
  # see also <https://stackoverflow.com/questions/4709912/how-to-make-grep-only-match-if-the-entire-line-matches>
    MT_MYWORLD_NAME="$new_worlds"
  else
    if [ -d "$MT_WORLDS_DIR/world" ]; then
      echo "Could not find any new worlds in $MT_WORLDS_DIR so using '$MT_MYWORLD_NAME'"
    else
      echo "Could not find any worlds in $MT_WORLDS_DIR"
    fi
  fi
  #if [ "$0" = "-bash" ]; then
#'[[' doesn't work in debian:
  #if [[ $0 == *"$shell_name"* ]]; then
  #doesn't work on Fedora since shell_name is blank even when in shell and not pasting:
  #if [ "$shell_name" != "" ]; then
  #  REPO_PATH="$HOME/GitHub/EnlivenMinetest"
  #  MT_MYWORLD_NAME="world"
  #  echo "You must have pasted this into terminal, so assuming MT_MYWORLD_NAME:"
  #  echo "  $MT_MYWORLD_NAME"
  #  echo "Press Ctrl C to cancel, otherwise $MT_MYWORLD_NAME will be used..."
  #  #sleep 1
  #  #echo " 3..."
  #  #sleep 1
  #  #echo " 2..."
  #  sleep 1
  #  echo " 1..."
  #  sleep 1
  #else
    read -e -p "Please enter a world (name only--must be in $MT_WORLDS_DIR): " -i "$MT_MYWORLD_NAME" MT_MYWORLD_NAME
    #$MT_DEFAULT_WORLD_NAME
    echo using "$MT_MYWORLD_NAME"
    #echo " 3..."
    #sleep 1
    #echo " 2..."
    sleep 1
    echo " 1..."
    sleep 1
  #fi
else
  #NOTE: $0 doesn't work because gives actual command (such as `./filename.sh`--gives filename only if command was `bash filename.sh`)
  #'[[' doesn't work in debian:
  #if [[ $0 == *"$shell_name"* ]]; then
  #if [ "$shell_name" = "" ]; then echo "running normally (not pasted)"
  #doesn't work on Fedora since shell_name is blank even when in shell and not pasting:
  #if [ "$shell_name" != "" ]; then
  #  REPO_PATH="$HOME/GitHub/EnlivenMinetest"
  #  MT_MYWORLD_NAME="$MT_DEFAULT_WORLD_NAME"
  #  echo "You must have pasted this into terminal, so assuming MT_MYWORLD_NAME:"
  #  echo "  $MT_MYWORLD_NAME"
  #else
    ls $MT_WORLDS_DIR
    read -p "Please enter a world [blank for $MT_DEFAULT_WORLD_NAME]: " MT_MYWORLD_NAME
    #$MT_DEFAULT_WORLD_NAME
    if [ -z "$MT_MYWORLD_NAME" ]; then
      MT_MYWORLD_NAME=$MT_DEFAULT_WORLD_NAME
    fi
    echo using "$MT_MYWORLD_NAME"
    echo " 3..."
    sleep 1
    echo " 2..."
    sleep 1
    echo " 1..."
    if [ -z "$MT_MYWORLD_NAME" ]; then
      MT_MYWORLD_NAME="$MT_DEFAULT_WORLD_NAME"
    fi
  #fi
fi
if [ ! -d "$MT_WORLDS_DIR/$MT_MYWORLD_NAME" ]; then
    echo "  ERROR: failed to find world path, so cannot continue." > $err_txt
    cat $err_txt
    echo "  press Ctrl C to cancel ENLIVEN install or this terminal will close..."
    sleep 1
    echo " 3..."
    sleep 1
    echo " 2..."
    sleep 1
    echo " 1..."
    sleep 1
    exit 1
fi
MT_MYWORLD_DIR=$MT_WORLDS_DIR/$MT_MYWORLD_NAME
echo "Using world at $MT_MYWORLD_DIR"
WORLD_MT_PATH=$MT_MYWORLD_DIR/world.mt
# see also https://www.shellscript.sh/functions.html

reinstall_mt_game() {
  if [ "$MT_MINETEST_GAME_PATH" = "/usr/local/share/minetest/games/minetest_game" ]; then
    SRC_MT="$HOME/minetest"
    if [ -d "$HOME/Downloads/minetest/games/minetest_game" ]; then
      SRC_MT="$HOME/Downloads/minetest"
    fi
    if [ -d "$SRC_MT" ]; then
      SRC_MT_GAME="$SRC_MT/games/minetest_game"
      cd $SRC_MT_GAME
      echo "updating $SRC_MT_GAME..."
      git pull
      cd
      sudo rm -Rf "$MT_MINETEST_GAME_PATH"
      sudo cp -R "$SRC_MT_GAME" "$USR_SHARE_MINETEST/games/"
      if [ -d "$USR_SHARE_MINETEST/games/minetest_game" ]; then
        echo "successfully recreated $USR_SHARE_MINETEST/games/minetest_game"
      else
        echo "  ERROR: failed to create $USR_SHARE_MINETEST/games/minetest_game, so cannot continue." > $err_txt
        cat $err_txt
        echo "  press Ctrl C to cancel ENLIVEN install or this terminal will close..."
        sleep 1
        echo " 3..."
        sleep 1
        echo " 2..."
        sleep 1
        echo " 1..."
        sleep 1
        exit 1
      fi
    else
      echo "ERROR: refusing to reinstall minetest_game since missing sources (not at $HOME/minetest/games/minetest_game nor $HOME/Downloads/minetest/games/minetest_game"
    fi
  else
    echo "ERROR: refusing to reinstall minetest_game to packaged dir: $MT_MINETEST_GAME_PATH"
  fi
}

add_zip_mod()
{
  cd $RELEASES_PATH
  MTMOD_DEST_NAME=$1
  MTMOD_GOT_NAME=$2
  URL=$3
  MTMOD_SRC_ZIP=$MTMOD_DEST_NAME.zip
  if [ ! -z "`ls | grep $MTMOD_GOT_NAME`" ]; then  # works with wildcard in variable
    rm -Rf $MTMOD_GOT_NAME
  fi
  if [ -f $MTMOD_SRC_ZIP ]; then
    rm -f $MTMOD_SRC_ZIP
  fi
  wget -O $MTMOD_SRC_ZIP $URL
  unzip -q "$MTMOD_SRC_ZIP"
  add_mod_from_here $MTMOD_DEST_NAME $MTMOD_GOT_NAME
}

add_git_mod()
{
  cd $GIT_REPOS_PATH
  MTMOD_DEST_NAME=$1
  MTMOD_GOT_NAME=$2
  URL=$3
  BRANCH=$4
  if [ ! -z "$BRANCH" ]; then
    cd $GIT_BRANCHES_PATH
    if [ ! -d "$BRANCH" ]; then
      mkdir "$BRANCH"
    fi
    cd "$BRANCH"
  fi
  if [ ! -d "$MTMOD_GOT_NAME" ]; then
    if [ ! -z "$BRANCH" ]; then
      echo "BRANCH: Cloning $BRANCH branch..."
      echo "git clone -b $BRANCH --single-branch $URL"
      git clone -b $BRANCH --single-branch $URL
    else
      #echo "Cloning main branch since no branch specified: $BRANCH"
      echo "git clone $URL"
      git clone $URL
    fi
  else
    cd $MTMOD_GOT_NAME
    git pull
    cd ..
  fi
  add_mod_from_here $MTMOD_DEST_NAME $MTMOD_GOT_NAME
}

add_mod_from_here()
{
  MTMOD_DEST_NAME=$1
  MTMOD_GOT_NAME=$2
  if [ ! -f "$MOD_LIST" ]; then touch "$MOD_LIST"; fi
  echo "$MTMOD_DEST_NAME" >> "$MOD_LIST"
  MTMOD_DEST_PATH=$MT_MYGAME_MODS_PATH/$MTMOD_DEST_NAME
  if [ -z "$MTMOD_DEST_NAME" ]; then
    echo "ERROR: nothing done since add_mod_from_here FAILED to receive 'MTMOD_DEST_NAME' (1st param)--this session will exit unless you press Ctrl-C to cancel script..."
    sleep 1
    echo "4..."
    sleep 1
    echo "3..."
    sleep 1
    echo "2..."
    sleep 1
    echo "1..."
    sleep 1
    exit 1
  fi
  if [ -z "$MTMOD_GOT_NAME" ]; then
    echo "ERROR: nothing done since add_mod_from_here FAILED to receive 'MTMOD_GOT_NAME' which is the exact downloaded or unzipped folder name (2nd param)--this session will exit unless you press Ctrl-C to cancel script..."
    sleep 1
    echo "4..."
    sleep 1
    echo "3..."
    sleep 1
    echo "2..."
    sleep 1
    echo "1..."
    sleep 1
    exit 1
  fi
if [ ! -d "$MTMOD_DEST_PATH" ] || [ "$update_enable" = "true" ]; then
  if [ ! -d "$MTMOD_GOT_NAME" ]; then
    echo "ERROR: nothing done since add_mod_from_here FAILED to find '$MTMOD_GOT_NAME'--this session will exit unless you press Ctrl-C to cancel script..."
    sleep 1
    echo "4..."
    sleep 1
    echo "3..."
    sleep 1
    echo "2..."
    sleep 1
    echo "1..."
    sleep 1
    exit 1
  fi
  if [ -d "$MTMOD_DEST_PATH" ]; then
    if [ ! -f "`command -v rsync`" ]; then
      echo "removing old $MTMOD_DEST_PATH"
      sudo rm -Rf "$MTMOD_DEST_PATH"
      if [ -d "$MTMOD_DEST_PATH" ]; then
        echo "FAILED to remove '$MTMOD_DEST_PATH'--this session will exit unless you press Ctrl-C to cancel script..."
        sleep 1
        echo "4..."
        sleep 1
        echo "3..."
        sleep 1
        echo "2..."
        sleep 1
        echo "1..."
        sleep 1
        exit 1
      fi
    fi
  fi
  if [ -d "$MTMOD_GOT_NAME" ]; then
    # outer case is for safety in case variable is blank or something
    if [ ! -f "`command -v rsync`" ]; then
      sudo cp -R $MTMOD_GOT_NAME "$MTMOD_DEST_PATH"
      if [ "$show_changes" != "false" ]; then
        echo "$MTMOD_DEST_PATH"
      fi
    else
      if [ ! -d "$MTMOD_DEST_PATH" ]; then
        sudo mkdir -p "$MTMOD_DEST_PATH"
      fi
      if [ "$show_changes" != "false" ]; then
        #sudo rsync -rtv "$MTMOD_GOT_NAME/" "$MTMOD_DEST_PATH"
        echo "  * preview of changes (before actual sync):"
        sudo rsync -zvc "$MTMOD_GOT_NAME/" "$MTMOD_DEST_PATH" --dry-run | grep -v '\.git' | grep -v '\./' | grep -v 'screenshot\.png' | grep -v received | grep -v 'DRY RUN'
      fi
      echo "  * synchronizing..."
      sudo rsync -rt "$MTMOD_GOT_NAME/" "$MTMOD_DEST_PATH"
    fi
    if [ -d "$MTMOD_DEST_PATH/.git" ]; then
      sudo rm -Rf "$MTMOD_DEST_PATH/.git"
    fi
    if [ -f "$MTMOD_DEST_PATH/.gitignore" ]; then
      sudo rm -Rf "$MTMOD_DEST_PATH/.gitignore"
    fi
    # remove etc to make users downloading mods faster:
    if [ -d "$MTMOD_DEST_PATH/etc" ]; then
      sudo rm -Rf "$MTMOD_DEST_PATH/etc"
    fi
    if [ -f "$MTMOD_DEST_PATH/screenshot.png" ]; then
      sudo rm -f "$MTMOD_DEST_PATH/screenshot.png"
    fi
  fi
  if [ ! -d "$MTMOD_DEST_PATH" ]; then
    echo "  ERROR: failed to get $MTMOD_DEST_PATH, so cannot continue." > $err_txt
    cat $err_txt
    echo "  press Ctrl C to cancel ENLIVEN install or this terminal will close..."
    sleep 1
    echo " 3..."
    sleep 1
    echo " 2..."
    sleep 1
    echo " 1..."
    sleep 1
    exit 1
  else
    echo "  [ + ] added as $MTMOD_DEST_PATH"
  fi
  cd
  #if [ -d GitHub/EnlivenMinetest ]; then
  #  cd GitHub/EnlivenMinetest
  #fi
else
  echo " [ ~ ] skipped existing $MTMOD_DEST_PATH"
fi
}

remove_mod()
{
  cd $HOME/Downloads
  MTMOD_DEST_NAME=$1
  MTMOD_DEST_PATH=$MT_MYGAME_MODS_PATH/$MTMOD_DEST_NAME
  if [ -d "$MTMOD_DEST_PATH" ]; then
    sudo rm -Rf "$MTMOD_DEST_PATH"
    if [ -d "$MTMOD_DEST_PATH" ]; then
      echo "  ERROR in remove_mod: failed to remove $MTMOD_DEST_PATH, so cannot continue." > $err_txt
      cat $err_txt
      echo "  press Ctrl C to cancel ENLIVEN install or this terminal will close..."
      sleep 1
      echo " 3..."
      sleep 1
      echo " 2..."
      sleep 1
      echo " 1..."
      sleep 1
      exit 1
    else
      echo "  [ - ] removed $MTMOD_DEST_PATH"
    fi
  else
    echo "  [ - ] already not present: $MTMOD_DEST_PATH"
  fi
  cd
  #if [ -d GitHub/EnlivenMinetest ]; then
  #  cd GitHub/EnlivenMinetest
  #fi
}
#echo "MT_MYGAME_MODS_PATH: $MT_MYGAME_MODS_PATH"
echo
echo
echo "To preconfigure, write true or false to files in $CONFIG_PATH named:"
echo "  local_enable"
#echo "  version_0_5_enable"
echo
echo "Using following configuration:"
#if [ -z "$version_0_5_enable" ]; then
#  echo "  version_0_5_enable: (auto--set this var before pasting region into terminal)"
#else
echo "  version_0_5_enable: $version_0_5_enable"
#fi
if [ -z "$local_enable" ]; then
  echo "  local_enable: (auto--set this var before pasting region into terminal)"
else
  echo "  local_enable: $local_enable"
fi
echo "  USR_SHARE_MINETEST: $USR_SHARE_MINETEST"
echo "  MT_MYGAME_DIR: $MT_MYGAME_DIR"
echo "  MT_WORLDS_DIR: $MT_WORLDS_DIR"
echo "  MT_MYWORLD_NAME: $MT_MYWORLD_NAME"
echo "  MT_MINETEST_GAME_PATH: $MT_MINETEST_GAME_PATH"
if [ ! -f "`command -v rsync`" ]; then
  echo
  echo "The 'rsync' command was not found. Installing rsync will reduce writes to drive if you run install methods (as all use add_mod_from_here) more than once for the same mod."
  echo
fi