#!/bin/sh

# Discourage Ubuntu users from using this script, since they can (and should) install chromium-codecs-ffmpeg-extra directly
if [ -r /etc/os-release ] && grep -qx 'ID=ubuntu' /etc/os-release; then
  echo "You should not use this script on Ubuntu, install chromium-codecs-ffmpeg-extra via apt instead." >&2
  read -p "Do you wish to continue anyway? [y/N]: " YN
  case "$YN" in
    [Yy]*) : ;;
    [Nn]*) echo "Exiting." ; exit ;;
        *) echo 'Answer not recognised, assuming "No". Exiting.'; exit ;;
  esac
fi

# Make sure the user is not runing as superuser
if [ "$UID" = "0" ]; then
  echo 'Do not run this script as root or via sudo. Run it as your normal user.' >&2
  exit 1
fi

available () {
  command -v "$1" >/dev/null 2>&1
}

# Make sure we have wget or curl
if available wget; then
  SILENT_DL="wget -qO-"
  LOUD_DL="wget"
elif available curl; then
  SILENT_DL="curl -sL"
  LOUD_DL="curl -O"
else
  echo "Install Wget or cURL" >&2
  exit 1
fi

# Set temp dir
TMP="${TMP:-/tmp}"

# Set staging dir
STAGINGDIR="$TMP/chromium-codecs-ffmpeg-extra-staging"

# Setup Arch
case `uname -m` in
   x86_64) DEB_ARCH=amd64; REPO=http://security.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/ ;;
     i?86) DEB_ARCH=i386; REPO=http://security.ubuntu.com/ubuntu/pool/universe/c/chromium-browser/ ;;
     arm*) DEB_ARCH=armhf; REPO=http://ports.ubuntu.com/ubuntu-ports/pool/universe/c/chromium-browser/ ;;
  aarch64) DEB_ARCH=arm64; REPO=http://ports.ubuntu.com/ubuntu-ports/pool/universe/c/chromium-browser/ ;;
esac

# Work out the VERSION
# Limit the UBUNTU version to 16.04 to avoid the glibc bump in 18.04, so that this works for older distros
UBUNTU_PACKAGE=`${SILENT_DL} "$REPO" | sed -rn "s/.*(chromium-codecs-ffmpeg-extra_([0-9]+\.){3}[0-9]+-[0-9]ubuntu[0-9]\.16\.04\.[1-9]_$DEB_ARCH.deb).*/\1/p" | sort | tail -n 1`
## The original match was
## UBUNTU_PACKAGE=`${SILENT_DL} "$REPO" | sed -rn "s/.*(chromium-codecs-ffmpeg-extra_([0-9]+\.){3}[0-9]+-[0-9]ubuntu[0-9]\.([0-9]{2}\.){2}[0-9\.]*_$DEB_ARCH.deb).*/\1/p" | sort | tail -n 1`
VERSION=`echo "$UBUNTU_PACKAGE" | sed -rn "s/.*_(([0-9]+\.){3}[0-9]+)-.*/\1/p"`

# Error out if $VERISON is unset, e.g. because previous command failed
if [ -z "$VERSION" ]; then
  echo "Could not work out the latest version; exiting" >&2
  exit 1
fi

# Don't start repackaging if the same version is already installed
if [ -r "$HOME/.local/lib/vivaldi/chromium-codecs-ffmpeg-extra-version.txt" ]; then
  . "$HOME/.local/lib/vivaldi/chromium-codecs-ffmpeg-extra-version.txt"
  if [ "$INSTALLED_VERSION" = "$VERSION" ]; then
    echo "The latest chromium-codecs-ffmpeg-extra ($VERSION) is already installed"
    exit 0
  fi
fi

# Now we could screw things up so exit on first error
set -e

# If the staging directory is already present from the past, clear it down
# and re-create it.
if [ -d "$STAGINGDIR" ]; then
  rm -fr "$STAGINGDIR"
fi

mkdir "$STAGINGDIR"
cd "$STAGINGDIR"

# Now get the deb package
$LOUD_DL "$REPO$UBUNTU_PACKAGE"


# Extract the contents of the chromium-codecs-ffmpeg-extra package
if available bsdtar; then
  DEB_EXTRACT_COMMAND='bsdtar xOf'
elif available ar; then
  DEB_EXTRACT_COMMAND='ar p'
else
  fallback_data_extract () {
    dd status=none iflag=skip_bytes if="$1" skip=`grep -Fabom1 "\`printf \"\\\\\3757zXZ\"\`" "$1" | cut -d: -f1`
  }
  DEB_EXTRACT_COMMAND=fallback_data_extract
fi
$DEB_EXTRACT_COMMAND "$UBUNTU_PACKAGE" data.tar.xz | tar xJf - ./usr/lib/chromium-browser/libffmpeg.so --strip 4

# Check the libffmpeg.so dependencies are resolved
if LANGUAGE=en ldd libffmpeg.so 2>&1 | grep -qm1 'not \(a dynamic executable\|found\)'; then
cat <<EOF >&2

It is not possible to use this alternative libffmpeg on your system.

Let us know via a post in our forums, mentioning your distro and distro
version:

  https://forum.vivaldi.net/category/35/vivaldi-browser-for-linux

EOF
  exit 1
fi

# Note the version number for future reference, during upgrades
echo "INSTALLED_VERSION=$VERSION" > chromium-codecs-ffmpeg-extra-version.txt

# Install the files
install -Dm644 libffmpeg.so "$HOME/.local/lib/vivaldi/libffmpeg.so"
install -Dm644 chromium-codecs-ffmpeg-extra-version.txt "$HOME/.local/lib/vivaldi/chromium-codecs-ffmpeg-extra-version.txt"

# Tell the user we are done
cat <<EOF

The following files were installed onto your system:

  $HOME/.local/lib/vivaldi/libffmpeg.so
  $HOME/.local/lib/vivaldi/chromium-codecs-ffmpeg-extra-version.txt

Restart Vivaldi and test H.264/MP4 support via this page:

  http://www.quirksmode.org/html5/tests/video.html

EOF