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#!/bin/bash
# GPLv3

addScreenshotsDir() (

[[ ! -d "$XDG_CONFIG_HOME" ]] && XDG_CONFIG_HOME="$HOME/.config"
[[ -f "$XDG_CONFIG_HOME/user-dirs.dirs" ]] && source "$XDG_CONFIG_HOME/user-dirs.dirs"

if [[ -d "$XDG_PICTURES_DIR" ]]; then
	ln -s "$XDG_PICTURES_DIR" "$POKEMMO/screenshots"
else
	[[ -L "$POKEMMO/screenshots" ]] && unlink "$POKEMMO/screenshots"
	mkdir -p "$POKEMMO/screenshots"
fi

)

getLauncherConfig() {

while read i; do
    case $i in
        installed=1) PKMO_IS_INSTALLED=1 ;;
        debugs=1) PKMO_CREATE_DEBUGS=1 ;;
        swr=1) export LIBGL_ALWAYS_SOFTWARE=1 ;;
        *) continue ;;
    esac
done <"$PKMOCONFIGDIR/pokemmo"

}

getJavaOpts() {

JAVA_OPTS=()

case "$1" in
    client)
        if [[ ! $SKIPJAVARAMOPTS ]]; then
            JAVA_OPTS=(-Xms128M)

            if [ -f "$POKEMMO/PokeMMO.l4j.ini" ]; then
                JAVA_OPTS+=($(grep -oE "\-Xmx[0-9]{1,4}(M|G)" "$POKEMMO/PokeMMO.l4j.ini" || echo -- "-Xmx384M"))
            else
                JAVA_OPTS+=(-Xmx384M)
            fi
        fi

        [[ $PKMO_CREATE_DEBUGS ]] && JAVA_OPTS+=(-XX:+UnlockDiagnosticVMOptions -XX:+LogVMOutput -XX:LogFile=client_jvm.log)
        [[ $LIBGL_ALWAYS_SOFTWARE ]] && JAVA_OPTS+=(-Dorg.lwjgl.opengl.Display.allowSoftwareOpenGL=true)
    ;;
    updater)
        [[ ! $SKIPJAVARAMOPTS ]] && JAVA_OPTS=(-Xms64M -Xmx128M)
        [[ $PKMO_CREATE_DEBUGS ]] && JAVA_OPTS+=(-XX:+UnlockDiagnosticVMOptions -XX:+LogVMOutput -XX:LogFile=updater_jvm.log)
    ;;
esac

echo "Java options were ${JAVA_OPTS[*]}"
}

showMessage() {
  if [ "$(command -v zenity)" ]; then
    case "$1" in
      --info) zenity --notification --window-icon=/usr/share/pixmaps/pokemmo-launcher.png --text="$2" ; echo "INFO: $2" ;;
      --error) zenity --error --width="250" --text="$2" ; echo "ERROR: $2" ; exit 1 ;;
      --warn) zenity --warning --width="250" --text="$2" ; echo "WARNING: $2" ;;
    esac
  elif [ "$(command -v kdialog)" ]; then
    case "$1" in
      --info) kdialog --icon /usr/share/pixmaps/pokemmo-launcher.png --passivepopup "$2" ; echo "INFO: $2" ;;
      --error) kdialog --error "$2" ; echo "ERROR: $2" ; exit 1 ;;
      --warn) kdialog --sorry "$2" ; echo "WARNING: $2" ;;
    esac
  else
    case "$1" in
      --info) echo "INFO: $2" ;;
      --error) echo "ERROR: $2" ; exit 1 ;;
      --warn) echo "WARNING: $2" ;;
    esac
  fi
}

downloadPokemmo() {

  [[ $(which openssl) ]] || showMessage --error "The openssl binary was not found. Please check your PATH is set correctly and restart the program."
  
  unset DL_MIRRORS PKMO_PUBKEY MIRROR_STATUS VALIDATION_STATUS
  
  DL_MIRRORS=(https://dl.pokemmo.eu https://files.pokemmo.eu https://dl.pokemmo.download https://dl.pokemmo.com)
  # This keyfile is provided by the PokeMMO developers. Do not alter/remove it, it is used to confirm the source of the downloaded files!
  PKMO_PUBKEY="-----BEGIN PUBLIC KEY-----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\na7ruRNgFlA2ciGUIIke2Ev2cYzyBA4LLARky2FZiEM0VAgMBAAE=\n-----END PUBLIC KEY-----"

  for (( i=0; i<"${#DL_MIRRORS[@]}"; i++ )); do
    echo "Trying mirror ${DL_MIRRORS[$i]}"

    [[ -f "$POKEMMO/pokemmo_updater.jar" || -f "$POKEMMO/pokemmo_updater.sig256" ]] && rm -f "$POKEMMO/pokemmo_updater.jar" "$POKEMMO/pokemmo_updater.sig256"
    MIRROR_STATUS=$( ( cd "$POKEMMO" && wget --https-only -U pokemmo_debian_setup --retry-connrefused --tries=3 --timeout=5 --waitretry=1 "${DL_MIRRORS[$i]}"/download/updater/pokemmo_updater.jar "${DL_MIRRORS[$i]}"/download/updater/pokemmo_updater.sig256 ) 2>&1)
    r=$?

    if [[ "$r" == "0" ]]; then
        echo "Got updater from ${DL_MIRRORS[$i]}"

        # `openssl` requires a filesystem to be inplace in order to read the checked key, but we don't really want to hit the disk due to security concerns
        # so, instead, we'll abuse procfs a bit
        exec {pkmo_fd}<<< "$(printf -- "$PKMO_PUBKEY")"
        VALIDATION_STATUS=$(openssl dgst -sha256 -verify /proc/$$/fd/$pkmo_fd -signature "$POKEMMO"/pokemmo_updater.sig256 "$POKEMMO"/pokemmo_updater.jar)
        exec {pkmo_fd}>&-

        # Older versions of openssl could throw ambiguous exit codes depending on the type of failure (e.g. if files were missing, returned 0).
        # This doesn't seem to be an issue now, but we'll prefer to parse the stdout instead of the exit codes for now
        if [[ "$VALIDATION_STATUS" = "Verified OK" ]]; then
            echo "Updater Verified OK!"
            break
        else
            echo "WARNING: Downloaded jar failed validation! Jumping to next mirror"
        fi
    elif [[ "$r" != "0" && "${DL_MIRRORS[$i]}" = "${DL_MIRRORS[-1]}" ]]; then
        rm -f "$POKEMMO/pokemmo_updater.jar" "$POKEMMO/pokemmo_updater.sig256"
        showMessage --error "Failed to download the updater:\n\n$MIRROR_STATUS"
    else
        echo "WARNING: Failed to download updater from mirror ${DL_MIRRORS[$i]}. Jumping to next.."
    fi
  done

  rm -f "$PKMOCONFIGDIR/pokemmo" "$POKEMMO/pokemmo_updater.sig256"
  find "$POKEMMO" -type f -name "*.TEMPORARY" -exec rm -f {} +

  # Updater exits with 1 on successful update
  getJavaOpts "updater"
  (cd "$POKEMMO" && java ${JAVA_OPTS[*]} -cp ./pokemmo_updater.jar com.pokeemu.updater.ClientUpdater -install -quick) && exit 1 || echo "installed=1" > "$PKMOCONFIGDIR/pokemmo"
  rm -f "$POKEMMO/pokemmo_updater.jar"
  
  # Post-update tasks
  [[ ! -d "$POKEMMO/screenshots" ]] && addScreenshotsDir
}

verifyInstallation() {
if [ ! -d "$POKEMMO" ]; then
  if [[ -e "$POKEMMO" || -L "$POKEMMO" ]]; then
    # Could also be a broken symlink
    showMessage --error "(Error 3) Could not install to $POKEMMO\n\n$POKEMMO already exists,\nbut is not a directory.\n\nMove or delete this file and try again."
  else
    mkdir -p "$POKEMMO"
    showMessage --info "PokeMMO is being installed to $POKEMMO"
    downloadPokemmo
    return
  fi
fi

if [[ ! -r "$POKEMMO" || ! -w "$POKEMMO" || ! -x "$POKEMMO" || ! "$PKMO_IS_INSTALLED" || ! -f "$POKEMMO/PokeMMO.exe" || ! -d "$POKEMMO/data" || ! -d "$POKEMMO/lib" ]]; then
    showMessage --warn "(Error 1) The installation is in a corrupt state.\n\nReverifying the game files."
    # Try to fix permissions before erroring out
    (chmod u+rwx "$POKEMMO" && find "$POKEMMO" -type d -exec chmod u+rwx {} + && find "$POKEMMO" -type f -exec chmod u+rw {} +) || showMessage --error "(Error 4) Could not fix permissions of $POKEMMO.\n\nContact PokeMMO support."
    downloadPokemmo
    return
fi

[[ $PKMO_REINSTALL && $PKMO_IS_INSTALLED ]] && downloadPokemmo
[[ ! -d "$POKEMMO/screenshots" ]] && addScreenshotsDir
}

######################
# Environment checks #
######################

[[ ! "$(command -v java)" ]] && showMessage --error "(Error 6) Java is not installed or is not executable. Exiting.."

if [[ -d "$XDG_CONFIG_HOME" ]]; then
    PKMOCONFIGDIR="$XDG_CONFIG_HOME/pokemmo"
else
    if [[ ! -e "$XDG_CONFIG_HOME" && -L "$XDG_CONFIG_HOME" ]]; then
        showMessage --error "(Error 10) The configuration directory ($XDG_CONFIG_HOME/pokemmo) is disconnected.\n\nPlease update your symlink and restart the program."
    else
        PKMOCONFIGDIR="$HOME/.config/pokemmo"
    fi
fi

if [ ! -d "$PKMOCONFIGDIR" ]; then
    if [[ -e "$PKMOCONFIGDIR" || -L "$PKMOCONFIGDIR" ]]; then
        showMessage --error "(Error 9) The configuration directory ($PKMOCONFIGDIR) already exists,\nbut is not a directory.\n\nMove or delete this file and try again."
    else
        mkdir -p "$PKMOCONFIGDIR"
    fi
fi

while getopts "vhH:-:" opt; do
    case $opt in
        -) case "$OPTARG" in
               skip-java-ram-opts) SKIPJAVARAMOPTS=1 ;;
               reverify) PKMO_REINSTALL=1 ;;
               debug) PKMO_CREATE_DEBUGS=1 ;;
               swr) export LIBGL_ALWAYS_SOFTWARE=1 ;;
           esac
        ;;
        v) set -x
           PS4='Line ${LINENO}: '
        ;;
        h) printf "\
 PokeMMO Linux Launcher v1.4\n\
 https://pokemmo.eu/\n\n\
 Usage: pokemmo-launcher [option...]\n\n\
 -h                     Display this dialogue\n\
 -H <dir>               Set the PokeMMO directory (Default: $HOME/.local/share/pokemmo).
                        This option is persistent and may be modified in $PKMOCONFIGDIR/pokemmodir \n\
 -v                     Print verbose status to stdout\n
 --debug                Enable java debug logs\n\
 --swr                  Try to fallback to an available software renderer\n\
 --reverify             Reverify the game files\n\
 --skip-java-ram-opts   Use the operating system's default RAM options instead of the suggested values\n"
           exit
        ;;
        H) mkdir -p "$OPTARG" || continue
           echo "$OPTARG" > "$PKMOCONFIGDIR/pokemmodir" ;;
        *) continue ;;
    esac
done

#################
# Start PokeMMO #
#################

[[ -f "$PKMOCONFIGDIR/pokemmo" ]] && getLauncherConfig

POKEMMO="$HOME/.pokemmo"

verifyInstallation

getJavaOpts "client"

if [[ $PKMO_CREATE_DEBUGS ]]; then
	cd "$POKEMMO"
    ( java ${JAVA_OPTS[*]} -cp ./lib/*:PokeMMO.exe com.pokeemu.client.Client ) &

	client_pid=$!
	
	echo "DEBUG: Spawned client_pid $client_pid"
	
    rm -f "$POKEMMO/client_jvm.log"

    while :; do
        sleep 3
        kill -3 "$client_pid" || break
        echo "DEBUG: Threads dumped for Client JVM. Sleeping for 3 seconds.."
    done

	wait
else
	cd "$POKEMMO" && java ${JAVA_OPTS[*]} -cp ./lib/*:PokeMMO.exe com.pokeemu.client.Client > /dev/null
fi