#!/usr/bin/env bash
#
# Copyright (C) 2009 Benjamin Drung <bdrung at ubuntu dot com>
# Copyright (C) 2012 Alessio Sergi <al3hex at gmail dot com>
#
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

set -e

# filled by the PKGBUILD
NAME='REPL_NAME'
VERSION='REPL_VERSION'
LANGUAGE="REPL_LANGUAGE"

DIRECTORY=~/.$NAME
INSTALL_DIRECTORY=$DIRECTORY/INSTALL
VERSION_FILE=$DIRECTORY/VERSION
LOG_FILE=$DIRECTORY/LOG
ARCH=$(uname -m)
DOWNLOAD_URL="https://www.torproject.org/dist/torbrowser/linux/tor-browser-gnu-linux-${ARCH}-${VERSION}-${LANGUAGE}.tar.gz"
SIG_URL=$DOWNLOAD_URL.asc

notify() {
  local title="$1"
  local message="$2"

  if [ $(which zenity 2>/dev/null) ]; then
    zenity --info --title "$title" --text "$message"
  elif [ $(which notify-send 2>/dev/null) ]; then
    notify-send "$title" "$message"
  elif [ $(which kdialog 2>/dev/null) ]; then
    kdialog --title "$title" --passivepopup "$message"
  else
    echo -e "$0: [$title] $message" >&2
  fi
}

update() {
    # remove previous installation and archives
    rm -rf $INSTALL_DIRECTORY/* $DIRECTORY/*.tar.gz $DIRECTORY/*.asc

    notify "Info" "Downloading and installing package archive, please be patient.\
        \nTor-Browser will start automatically afterwards." &

    echo "$0: Downloading $DOWNLOAD_URL." >> $LOG_FILE
    wget $DOWNLOAD_URL >> $LOG_FILE 2>&1 || notify "Error" \
        "The tor-browser archive could not be downloaded. \
        \nCheck your Internet connection and try again. \
        \nThe error log can be found in $LOG_FILE."

    echo "$0: Downloading $SIG_URL" >> $LOG_FILE
    wget $SIG_URL >> $LOG_FILE 2>&1 || notify "Error" \
        "The tor-browser archive signature file could not be downloaded. \
        \nCheck your Internet connection and try again. \
        \nThe error log can be found in $LOG_FILE."

#   if [ $(which gpg 2>/dev/null) ]; then
#       gpg --auto-key-locate x-hkp://pool.sks-keyservers.net \
#           --verify tor-browser-gnu-linux-${ARCH}-${VERSION}-${LANGUAGE}.tar.gz.asc \
#           tor-browser-gnu-linux-${ARCH}-${VERSION}-${LANGUAGE}.tar.gz \
#           >> $LOG_FILE 2>&1 || notify "Warning" \
#           "Problems checking the signature of \
#           tor-browser-gnu-linux-${ARCH}-${VERSION}.tar.gz. \
#           \nEither there was an error retrieving the public key or the signature is incorrect!\
#           \nThe log file can be found in $LOG_FILE."
#   fi

    tar -xzf tor-browser-gnu-linux-${ARCH}-${VERSION}-${LANGUAGE}.tar.gz -C $INSTALL_DIRECTORY >> $LOG_FILE 2>&1 || notify "Error" \
        "Error unpacking tor-browser-gnu-linux-${ARCH}-${VERSION}-${LANGUAGE}.tar.gz. \
        \nThe error log can be found in $LOG_FILE."

    mv $INSTALL_DIRECTORY/tor-browser_${LANGUAGE}/* $INSTALL_DIRECTORY >> $LOG_FILE 2>&1
    rm -rf $INSTALL_DIRECTORY/tor-browser_${LANGUAGE}/ tor-browser-gnu-linux-${ARCH}-${VERSION}-${LANGUAGE}.tar.gz tor-browser-gnu-linux-${ARCH}-${VERSION}-${LANGUAGE}.tar.gz.asc >> $LOG_FILE 2>&1
    [[ -f $INSTALL_DIRECTORY/start-tor-browser ]] && echo $VERSION > $VERSION_FILE
}

usage() {
  cat <<EOF
Usage: ${0##*/} [option]

Options:
  -h                Show this help message and exit
  -u                Force update
  -r <directory>    The Tor-Browser directory to use
EOF
}

while getopts ':hr:u' opt; do
    case "$opt" in
        h) usage; exit 0 ;;
        r) DIRECTORY="$OPTARG" ;;
        u) update=1 ;;
        :) echo "$0: Option '-$OPTARG' requires an argument" >&2
            exit 1 ;;
        *) echo "$0: Invalid option '-$OPTARG'" >&2
            usage; exit 1 ;;
    esac
done

# create directory, if it is missing (e.g. first run)
[[ ! -d "$INSTALL_DIRECTORY" ]] && mkdir -p "$INSTALL_DIRECTORY"
cd "$DIRECTORY"

# clear log
> $LOG_FILE

# create version file if missing
[[ ! -f $VERSION_FILE ]] && echo 0 > $VERSION_FILE

#get installed version
while read line
do
    INSTALLED_VERSION=$line
done < $VERSION_FILE

# start update if old or no tor-browser is installed
if [[ "$INSTALLED_VERSION" == "$VERSION" ]] && [[ $update != 1 ]]; then
    cd $INSTALL_DIRECTORY && './start-tor-browser'
else
    echo "$0: Your version in $DIRECTORY is outdated or you do not have installed $NAME yet." >> $LOG_FILE
    update

    # fire up
    $NAME
fi