#!/bin/bash
#################
# Launcher init #
#################

START=$(date +%s.%N)

# On Fedora $SNAP is under /var and there is some magic to map it to /snap.
# # We need to handle that case and reset $SNAP
SNAP=`echo $SNAP | sed -e "s|/var/lib/snapd||g"`

needs_update=true

. $SNAP_USER_DATA/.last_revision 2>/dev/null || true
if [ "$SNAP_DESKTOP_LAST_REVISION" = "$SNAP_REVISION" ]; then
  needs_update=false
fi

# Set $REALHOME to the users real home directory
REALHOME=`getent passwd $UID | cut -d ':' -f 6`

# If the user has modified their user-dirs settings, force an update
if [[ -f $HOME/.config/user-dirs.dirs.md5sum && -f $HOME/.config/user-dirs.locale.md5sum ]]; then
  if [[ "$(md5sum < $REALHOME/.config/user-dirs.dirs)" != "$(cat $HOME/.config/user-dirs.dirs.md5sum)" ||
        "$(md5sum < $REALHOME/.config/user-dirs.locale)" != "$(cat $HOME/.config/user-dirs.locale.md5sum)" ]]; then
    needs_update=true
  fi
fi

if [ "$SNAP_ARCH" == "amd64" ]; then
  ARCH="x86_64-linux-gnu"
elif [ "$SNAP_ARCH" == "armhf" ]; then
  ARCH="arm-linux-gnueabihf"
elif [ "$SNAP_ARCH" == "arm64" ]; then
  ARCH="aarch64-linux-gnu"
else
  ARCH="$SNAP_ARCH-linux-gnu"
fi

export SNAP_LAUNCHER_ARCH_TRIPLET=$ARCH

# Don't LD_PRELOAD bindtextdomain for classic snaps
if ! grep -qs "^\s*confinement:\s*classic\s*" $SNAP/meta/snap.yaml; then
  if [ -f $SNAP/lib/bindtextdomain.so ]; then
    export LD_PRELOAD=$LD_PRELOAD:$SNAP/lib/bindtextdomain.so
  fi
fi
###############################################
# Launcher common exports for any desktop app #
###############################################

function prepend_dir() {
  local var="$1"
  local dir="$2"
  if [ -d "$dir" ]; then
    eval "export $var=\"\$dir\${$var:+:\$$var}\""
  fi
}

function append_dir() {
  local var="$1"
  local dir="$2"
  if [ -d "$dir" ]; then
    eval "export $var=\"\${$var:+\$$var:}\$dir\""
  fi
}

function can_open_file() {
  return `head -c0 "$1" &> /dev/null`;
}

WITH_RUNTIME=no
if [ -z "$RUNTIME" ]; then
  RUNTIME=$SNAP
else
  # add general paths not added by snapcraft due to runtime snap
  append_dir LD_LIBRARY_PATH $RUNTIME/lib/$ARCH
  append_dir LD_LIBRARY_PATH $RUNTIME/usr/lib/$ARCH
  append_dir PATH $RUNTIME/usr/bin
  WITH_RUNTIME=yes
fi

# XKB config
export XKB_CONFIG_ROOT=$RUNTIME/usr/share/X11/xkb

# Give XOpenIM a chance to locate locale data.
# This is required for text input to work in SDL2 games.
export XLOCALEDIR=$RUNTIME/usr/share/X11/locale

# Set XCursors path
export XCURSOR_PATH=$RUNTIME/usr/share/icons

# Mesa Libs for OpenGL support
append_dir LD_LIBRARY_PATH $RUNTIME/usr/lib/$ARCH/mesa
append_dir LD_LIBRARY_PATH $RUNTIME/usr/lib/$ARCH/mesa-egl

# Tell libGL where to find the drivers
export LIBGL_DRIVERS_PATH=$RUNTIME/usr/lib/$ARCH/dri
append_dir LD_LIBRARY_PATH $LIBGL_DRIVERS_PATH

# Workaround in snapd for proprietary nVidia drivers mounts the drivers in
# /var/lib/snapd/lib/gl that needs to be in LD_LIBRARY_PATH
# Without that OpenGL using apps do not work with the nVidia drivers.
# Ref.: https://bugs.launchpad.net/snappy/+bug/1588192
append_dir LD_LIBRARY_PATH /var/lib/snapd/lib/gl

# Unity7 export (workaround for https://launchpad.net/bugs/1638405)
append_dir LD_LIBRARY_PATH $RUNTIME/usr/lib/$ARCH/libunity

# Pulseaudio export
append_dir LD_LIBRARY_PATH $RUNTIME/usr/lib/$ARCH/pulseaudio

# EGL vendor files on glvnd enabled systems
[ -d /var/lib/snapd/lib/glvnd/egl_vendor.d ] && \
    append_dir __EGL_VENDOR_LIBRARY_DIRS /var/lib/snapd/lib/glvnd/egl_vendor.d

# Tell GStreamer where to find its plugins
export GST_PLUGIN_PATH=$SNAP/usr/lib/$ARCH/gstreamer-1.0
export GST_PLUGIN_SYSTEM_PATH=$RUNTIME/usr/lib/$ARCH/gstreamer-1.0
# gst plugin scanner doesn't install in the correct path: https://github.com/ubuntu/snapcraft-desktop-helpers/issues/43
export GST_PLUGIN_SCANNER=$RUNTIME/usr/lib/$ARCH/gstreamer1.0/gstreamer-1.0/gst-plugin-scanner

# XDG Config
[ "$WITH_RUNTIME" = yes ] && prepend_dir XDG_CONFIG_DIRS $RUNTIME/etc/xdg
prepend_dir XDG_CONFIG_DIRS $SNAP/etc/xdg

# Define snaps' own data dir
[ "$WITH_RUNTIME" = yes ] && prepend_dir XDG_DATA_DIRS $RUNTIME/usr/share
prepend_dir XDG_DATA_DIRS $SNAP/usr/share
prepend_dir XDG_DATA_DIRS $SNAP/share
prepend_dir XDG_DATA_DIRS $SNAP/data-dir
prepend_dir XDG_DATA_DIRS $SNAP_USER_DATA

# Set XDG_DATA_HOME to local path
export XDG_DATA_HOME=$SNAP_USER_DATA/.local/share
mkdir -p $XDG_DATA_HOME

# Workaround for GLib < 2.53.2 not searching for schemas in $XDG_DATA_HOME:
#   https://bugzilla.gnome.org/show_bug.cgi?id=741335
prepend_dir XDG_DATA_DIRS $XDG_DATA_HOME

# Set cache folder to local path
export XDG_CACHE_HOME=$SNAP_USER_COMMON/.cache
if [[ -d $SNAP_USER_DATA/.cache && ! -e $XDG_CACHE_HOME ]]; then
  # the .cache directory used to be stored under $SNAP_USER_DATA, migrate it
  mv $SNAP_USER_DATA/.cache $SNAP_USER_COMMON/
fi
mkdir -p $XDG_CACHE_HOME

# Set config folder to local path
export XDG_CONFIG_HOME=$SNAP_USER_DATA/.config
mkdir -p $XDG_CONFIG_HOME

# Create $XDG_RUNTIME_DIR if not exists (to be removed when LP: #1656340 is fixed)
[ -n "$XDG_RUNTIME_DIR" ] && mkdir -p $XDG_RUNTIME_DIR -m 700

# Ensure the app finds locale definitions (requires locales-all to be installed)
append_dir LOCPATH $RUNTIME/usr/lib/locale

# If any, keep track of where XDG dirs were so we can potentially migrate the content later
test -f ${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs && . ${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs
for d in DOCUMENTS DESKTOP DOWNLOAD MUSIC PICTURES VIDEOS PUBLICSHARE TEMPLATES; do
  eval $(echo "OLD_XDG_${d}_DIR")=`eval "$(echo "echo \\$XDG_${d}_DIR")"`
done

# Setup user-dirs.* or run xdg-user-dirs-update if needed
needs_xdg_update=false
needs_xdg_links=false
if can_open_file "$REALHOME/.config/user-dirs.dirs" && can_open_file "$REALHOME/.config/user-dirs.locale"; then
   mkdir -p $HOME/.config -m 700
   sed /^#/!s#\$HOME#${REALHOME}#g $REALHOME/.config/user-dirs.dirs > $HOME/.config/user-dirs.dirs
   cp -a $REALHOME/.config/user-dirs.locale $HOME/.config/
   for f in user-dirs.dirs user-dirs.locale; do
     md5sum < $REALHOME/.config/$f > $HOME/.config/$f.md5sum
   done
else
   needs_xdg_update=true
   needs_xdg_links=true
fi

# Check if we can actually read the contents of each xdg dir
test -f ${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs && . ${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs
XDG_SPECIAL_DIRS=($XDG_DOCUMENTS_DIR $XDG_DESKTOP_DIR $XDG_DOWNLOAD_DIR $XDG_MUSIC_DIR $XDG_PICTURES_DIR $XDG_VIDEOS_DIR $XDG_PUBLIC_DIR $XDG_TEMPLATES_DIR)
for d in ${XDG_SPECIAL_DIRS[@]}; do
  if ! can_open_file $d; then
    needs_xdg_update=true
  fi
done

# If needs XDG update and xdg-user-dirs-update exists in $PATH, run it
if [ $needs_xdg_update = true ] && command -v xdg-user-dirs-update >/dev/null; then
   xdg-user-dirs-update
fi
    
# Create links for user-dirs.dirs
if [ $needs_xdg_links = true ]; then
  test -f ${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs && . ${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs
  XDG_SPECIAL_DIRS=($XDG_DOCUMENTS_DIR $XDG_DESKTOP_DIR $XDG_DOWNLOAD_DIR $XDG_MUSIC_DIR $XDG_PICTURES_DIR $XDG_VIDEOS_DIR $XDG_PUBLIC_DIR $XDG_TEMPLATES_DIR)
  for d in ${XDG_SPECIAL_DIRS[@]}; do
    b=$(realpath "$d" --relative-to="$REALHOME")
    if [ -e $REALHOME/$b ] && [ ! -e $HOME/$b ]; then
      ln -s $REALHOME/$b $HOME/$b
    fi
  done
else
  # If we aren't creating new links, check if we have content saved in old locations and move it
  for d in DOCUMENTS DESKTOP DOWNLOAD MUSIC PICTURES VIDEOS PUBLICSHARE TEMPLATES; do
    old=`eval "$(echo "echo \\$OLD_XDG_${d}_DIR")"`
    new=`eval "$(echo "echo \\$XDG_${d}_DIR")"`
    if [ -L "$old" ] && [ -d "$new" ] && [ `readlink "$old"` != "$new" ]; then
      mv "$old"/* "$new"/ 2>/dev/null
    elif [ -d "$old" ] && [ -d "$new" ] && [ "$old" != "$new" ]; then
      mv "$old"/* "$new"/ 2>/dev/null
    fi
  done
fi

# If detect wayland server socket, then set environment so applications prefer
# wayland, and setup compat symlink (until we use user mounts. Remember,
# XDG_RUNTIME_DIR is /run/user/<uid>/snap.$SNAP so look in the parent directory
# for the socket. For details:
# https://forum.snapcraft.io/t/wayland-dconf-and-xdg-runtime-dir/186/10
# Applications that don't support wayland natively may define DISABLE_WAYLAND
# (to any non-empty value) to skip that logic entirely.
wayland_available=false
if [[ -n "$XDG_RUNTIME_DIR" && -z "$DISABLE_WAYLAND" ]]; then
    wdisplay="wayland-0"
    if [ -n "$WAYLAND_DISPLAY" ]; then
        wdisplay="$WAYLAND_DISPLAY"
    fi
    wayland_sockpath="$XDG_RUNTIME_DIR/../$wdisplay"
    wayland_snappath="$XDG_RUNTIME_DIR/$wdisplay"
    if [ -S "$wayland_sockpath" ]; then
        # if running under wayland, use it
        #export WAYLAND_DEBUG=1
        wayland_available=true
        # create the compat symlink for now
        if [ ! -e "$wayland_snappath" ]; then
            ln -s "$wayland_sockpath" "$wayland_snappath"
        fi
    fi
fi

# Make PulseAudio socket available inside the snap-specific $XDG_RUNTIME_DIR
if [ -n "$XDG_RUNTIME_DIR" ]; then
    pulsenative="pulse/native"
    pulseaudio_sockpath="$XDG_RUNTIME_DIR/../$pulsenative"
    if [ -S "$pulseaudio_sockpath" ]; then
        export PULSE_SERVER="unix:${pulseaudio_sockpath}"
    fi
fi

# GI repository
[ "$WITH_RUNTIME" = yes ] && prepend_dir GI_TYPELIB_PATH $RUNTIME/usr/lib/$ARCH/girepository-1.0
[ "$WITH_RUNTIME" = yes ] && prepend_dir GI_TYPELIB_PATH $RUNTIME/usr/lib/girepository-1.0
prepend_dir GI_TYPELIB_PATH $SNAP/usr/lib/$ARCH/girepository-1.0
prepend_dir GI_TYPELIB_PATH $SNAP/usr/lib/girepository-1.0
prepend_dir GI_TYPELIB_PATH $SNAP/usr/lib/gjs/girepository-1.0

# Keep an array of data dirs, for looping through them
IFS=':' read -r -a data_dirs_array <<< "$XDG_DATA_DIRS"

# Font Config and themes
export FONTCONFIG_PATH=$RUNTIME/etc/fonts
export FONTCONFIG_FILE=$RUNTIME/etc/fonts/fonts.conf

function make_user_fontconfig {
  echo "<fontconfig>"
  if [ -d $REALHOME/.local/share/fonts ]; then
    echo "  <dir>$REALHOME/.local/share/fonts</dir>"
  fi
  if [ -d $REALHOME/.fonts ]; then
    echo "  <dir>$REALHOME/.fonts</dir>"
  fi
  for d in "${data_dirs_array[@]}"; do
    if [ -d "$d/fonts" ]; then
      echo "  <dir>$d/fonts</dir>"
    fi
  done
  echo '  <include ignore_missing="yes">conf.d</include>'
  # We need to include this default cachedir first so that caching
  # works: without it, fontconfig will try to write to the real user home
  # cachedir and be blocked by AppArmor.
  echo '  <cachedir prefix="xdg">fontconfig</cachedir>'
  if [ -d $REALHOME/.cache/fontconfig ]; then
    echo "  <cachedir>$REALHOME/.cache/fontconfig</cachedir>"
  fi
  echo "</fontconfig>"
}

if [ $needs_update = true ]; then
  rm -rf $XDG_DATA_HOME/{fontconfig,fonts,fonts-*,themes,.themes}

  # This fontconfig fragment is installed in a location that is
  # included by the system fontconfig configuration: namely the
  # etc/fonts/conf.d/50-user.conf file.
  mkdir -p $XDG_CONFIG_HOME/fontconfig
  make_user_fontconfig > $XDG_CONFIG_HOME/fontconfig/fonts.conf

  # the themes symlink are needed for GTK 3.18 when the prefix isn't changed
  # GTK 3.20 looks into XDG_DATA_DIR which has connected themes.
  ln -sf $RUNTIME/usr/share/themes $XDG_DATA_HOME
  ln -sfn $RUNTIME/usr/share/themes $SNAP_USER_DATA/.themes
fi

# Build mime.cache
# needed for gtk and qt icon
if [ $needs_update = true ]; then
  rm -rf $XDG_DATA_HOME/mime
  if [ ! -f $RUNTIME/usr/share/mime/mime.cache ]; then
    if command -v update-mime-database >/dev/null; then
      cp --preserve=timestamps -dR $RUNTIME/usr/share/mime $XDG_DATA_HOME
      update-mime-database $XDG_DATA_HOME/mime
    fi
  fi
fi

# Gio modules and cache (including gsettings module)
export GIO_MODULE_DIR=$XDG_CACHE_HOME/gio-modules
function compile_giomodules {
  if [ -f $1/glib-2.0/gio-querymodules ]; then
    rm -rf $GIO_MODULE_DIR
    mkdir -p $GIO_MODULE_DIR
    ln -s $1/gio/modules/*.so $GIO_MODULE_DIR
    $1/glib-2.0/gio-querymodules $GIO_MODULE_DIR
  fi
}
if [ $needs_update = true ]; then
  compile_giomodules $RUNTIME/usr/lib/$ARCH
fi

# Setup compiled gsettings schema
GS_SCHEMA_DIR=$XDG_DATA_HOME/glib-2.0/schemas
function compile_schemas {
  if [ -f "$1" ]; then
    rm -rf $GS_SCHEMA_DIR
    mkdir -p $GS_SCHEMA_DIR
    for d in "${data_dirs_array[@]}"; do
      schema_dir=$d/glib-2.0/schemas
      if [ -f "$schema_dir/gschemas.compiled" ]; then
        # This directory already has compiled schemas
        continue
      fi
      if [ -n "$(ls -A $schema_dir/*.xml 2>/dev/null)" ]; then
        ln -s $schema_dir/*.xml $GS_SCHEMA_DIR
      fi
      if [ -n "$(ls -A $schema_dir/*.override 2>/dev/null)" ]; then
        ln -s $schema_dir/*.override $GS_SCHEMA_DIR
      fi
    done
    # Only compile schemas if we copied anyting
    if [ -n "$(ls -A $GS_SCHEMA_DIR/*.xml $GS_SCHEMA_DIR/*.override 2>/dev/null)" ]; then
      "$1" $GS_SCHEMA_DIR
    fi
  fi
}
if [ $needs_update = true ]; then
  compile_schemas $RUNTIME/usr/lib/$ARCH/glib-2.0/glib-compile-schemas
fi

# Enable gsettings user changes
# symlink the dconf file if home plug is connected for read
DCONF_DEST_USER_DIR=$SNAP_USER_DATA/.config/dconf
if [ ! -f $DCONF_DEST_USER_DIR/user ]; then
  if [ -f $REALHOME/.config/dconf/user ]; then
    mkdir -p $DCONF_DEST_USER_DIR
    ln -s $REALHOME/.config/dconf/user $DCONF_DEST_USER_DIR
  fi
fi

# Testability support
append_dir LD_LIBRARY_PATH $SNAP/testability
append_dir LD_LIBRARY_PATH $SNAP/testability/$ARCH
append_dir LD_LIBRARY_PATH $SNAP/testability/$ARCH/mesa

# Gdk-pixbuf loaders
export GDK_PIXBUF_MODULE_FILE=$XDG_CACHE_HOME/gdk-pixbuf-loaders.cache
export GDK_PIXBUF_MODULEDIR=$RUNTIME/usr/lib/$ARCH/gdk-pixbuf-2.0/2.10.0/loaders
if [ $needs_update = true ]; then
  rm -f $GDK_PIXBUF_MODULE_FILE
  if [ -f $RUNTIME/usr/lib/$ARCH/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders ]; then
    $RUNTIME/usr/lib/$ARCH/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders > $GDK_PIXBUF_MODULE_FILE
  fi
fi

# Icon themes cache
if [ $needs_update = true ]; then
  rm -rf $XDG_DATA_HOME/icons
  mkdir -p $XDG_DATA_HOME/icons
  for d in "${data_dirs_array[@]}"; do
    for i in $d/icons/*; do
      if [ -f "$i/index.theme" -a ! -f "$i/icon-theme.cache" ]; then
        theme_dir=$XDG_DATA_HOME/icons/$(basename "$i")
        if [ ! -d "$theme_dir" ]; then
          mkdir -p "$theme_dir"
          ln -s $i/* "$theme_dir"
          if [ -f $RUNTIME/usr/sbin/update-icon-caches ]; then
            $RUNTIME/usr/sbin/update-icon-caches "$theme_dir"
          elif [ -f $RUNTIME/usr/sbin/update-icon-cache.gtk2 ]; then
            $RUNTIME/usr/sbin/update-icon-cache.gtk2 "$theme_dir"
          fi
        fi
      fi
    done
  done
fi

# GTK theme and behavior modifier
# Those can impact the theme engine used by Qt as well
gtk_configs=(.config/gtk-3.0/settings.ini .config/gtk-3.0/bookmarks .config/gtk-2.0/gtkfilechooser.ini)
for f in ${gtk_configs[@]}; do
  dest="$SNAP_USER_DATA/$f"
  if [ ! -L "$dest" ]
  then
    mkdir -p `dirname $dest`
    ln -s $REALHOME/$f $dest
  fi
done

# create symbolic link to ibus socket path for ibus to look up its socket files
# (see comments #3 and #6 on https://launchpad.net/bugs/1580463)
IBUS_CONFIG_PATH=$XDG_CONFIG_HOME/ibus
mkdir -p $IBUS_CONFIG_PATH
[ -d $IBUS_CONFIG_PATH/bus ] && rm -rf $IBUS_CONFIG_PATH/bus
ln -sfn $REALHOME/.config/ibus/bus $IBUS_CONFIG_PATH

##############################
# Glib minimum specific part #
##############################

###############################
# Mark update and exec binary #
###############################

[ $needs_update = true ] && echo "SNAP_DESKTOP_LAST_REVISION=$SNAP_REVISION" > $SNAP_USER_DATA/.last_revision

if [ -n "$SNAP_DESKTOP_DEBUG" ]; then
  echo "desktop-launch elapsed time: " $(date +%s.%N --date="$START seconds ago") 
  echo "Now running: exec $@"
fi

exec "$@"
