###############################################
# 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`;
}

function update_xdg_dirs_values() {
  local save_initial_values=false
  local XDG_DIRS="DOCUMENTS DESKTOP DOWNLOAD MUSIC PICTURES VIDEOS PUBLICSHARE TEMPLATES"
  unset XDG_SPECIAL_DIRS_PATHS

  if [ -f "${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs" ]; then
    source "${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs"
  fi

  if [ -z ${XDG_SPECIAL_DIRS+x} ]; then
    save_initial_values=true
  fi

  for d in $XDG_DIRS; do
    var="XDG_${d}_DIR"
    value="$(eval echo $(echo \$${var}))"

    if [ "$save_initial_values" = true ]; then
      XDG_SPECIAL_DIRS+=("$var")
      XDG_SPECIAL_DIRS_INITIAL_PATHS+=("$value")
    fi

    XDG_SPECIAL_DIRS_PATHS+=("$value")
  done
}

function is_subpath() {
  dir=$(realpath $1)
  parent=$(realpath $2)
  [ "${dir##$parent/}" != "$dir" ] && return 0 || return 1
}

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
  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
prepend_dir XCURSOR_PATH $SNAP/data-dir/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 and libva where to find the drivers
export LIBGL_DRIVERS_PATH=$RUNTIME/usr/lib/$ARCH/dri
append_dir LD_LIBRARY_PATH $LIBGL_DRIVERS_PATH
export LIBVA_DRIVERS_PATH=$RUNTIME/usr/lib/$ARCH/dri

# 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 ] && \
    prepend_dir __EGL_VENDOR_LIBRARY_DIRS /var/lib/snapd/lib/glvnd/egl_vendor.d

# EGL vendor files
append_dir __EGL_VENDOR_LIBRARY_DIRS $RUNTIME/etc/glvnd/egl_vendor.d
append_dir __EGL_VENDOR_LIBRARY_DIRS $RUNTIME/usr/share/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
ensure_dir_exists $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
ensure_dir_exists $XDG_CACHE_HOME

# Create $XDG_RUNTIME_DIR if not exists (to be removed when LP: #1656340 is fixed)
ensure_dir_exists $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
update_xdg_dirs_values

# Setup user-dirs.* or run xdg-user-dirs-update if needed
needs_xdg_update=false
needs_xdg_reload=false
needs_xdg_links=false

if [ "$HOME" != "$SNAP_USER_DATA" ] && ! is_subpath "$XDG_CONFIG_HOME" "$HOME"; then
  for f in user-dirs.dirs user-dirs.locale; do
    if [ -f "$HOME/.config/$f" ]; then
      mv "$HOME/.config/$f" "$XDG_CONFIG_HOME"
      needs_xdg_reload=true
    fi
  done
fi

if can_open_file "$REALHOME/.config/user-dirs.dirs"; then
  # shellcheck disable=SC2154
  if [ "$needs_update" = true ] || [ "$needs_xdg_reload" = true ]; then
    sed "/^#/!s#\$HOME#${REALHOME}#g" "$REALHOME/.config/user-dirs.dirs" > "$XDG_CONFIG_HOME/user-dirs.dirs"
    md5sum < "$REALHOME/.config/user-dirs.dirs" > "$XDG_CONFIG_HOME/user-dirs.dirs.md5sum"
    # It's possible user-dirs.dirs exists when user-dirs.locale doesn't. This
    # simply means the user opted to never ask to translate their user dirs
    if can_open_file "$REALHOME/.config/user-dirs.locale"; then
      cp -a "$REALHOME/.config/user-dirs.locale" "$XDG_CONFIG_HOME"
      md5sum < "$REALHOME/.config/user-dirs.locale" > "$XDG_CONFIG_HOME/user-dirs.locale.md5sum"
    elif [ -f "$XDG_CONFIG_HOME/user-dirs.locale.md5sum" ]; then
      rm "$XDG_CONFIG_HOME/user-dirs.locale.md5sum"
    fi
    needs_xdg_reload=true
  fi
else
  needs_xdg_update=true
  needs_xdg_links=true
fi

if [ $needs_xdg_reload = true ]; then
  update_xdg_dirs_values
  needs_xdg_reload=false
fi

# Check if we can actually read the contents of each xdg dir
for ((i = 0; i < ${#XDG_SPECIAL_DIRS_PATHS[@]}; i++)); do
  if ! can_open_file "${XDG_SPECIAL_DIRS_PATHS[$i]}"; then
    needs_xdg_update=true
    needs_xdg_links=true
    break
  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
  update_xdg_dirs_values
fi

# Create links for user-dirs.dirs
if [ $needs_xdg_links = true ]; then
  for ((i = 0; i < ${#XDG_SPECIAL_DIRS_PATHS[@]}; i++)); do
    b=$(realpath "${XDG_SPECIAL_DIRS_PATHS[$i]}" --relative-to="$HOME")
    if [[ "$b" != "." && -e $REALHOME/$b ]]; then
      [ -d $HOME/$b ] && rmdir $HOME/$b 2> /dev/null
      [ ! -e $HOME/$b ] && 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 ((i = 0; i < ${#XDG_SPECIAL_DIRS[@]}; i++)); do
    old="${XDG_SPECIAL_DIRS_INITIAL_PATHS[$i]}"
    new="${XDG_SPECIAL_DIRS_PATHS[$i]}"
    if [ -L "$old" ] && [ -d "$new" ] && [ `readlink "$old"` != "$new" ]; then
      mv -vn "$old"/* "$new"/ 2>/dev/null
    elif [ -d "$old" ] && [ -d "$new" ] && [ "$old" != "$new" ] &&
         (is_subpath "$old" "$SNAP_USER_DATA" || is_subpath "$old" "$SNAP_USER_COMMON"); then
      mv -vn "$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 ((i = 0; i < ${#data_dirs_array[@]}; i++)); do
    if [ -d "${data_dirs_array[$i]}/fonts" ]; then
      echo "  <dir>${data_dirs_array[$i]}/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.
  ensure_dir_exists $XDG_CONFIG_HOME/fontconfig
  async_exec 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.
  if [ -d $SNAP/data-dir/themes ]; then
    ln -sf $SNAP/data-dir/themes $XDG_DATA_HOME
    ln -sfn $SNAP/data-dir/themes $SNAP_USER_DATA/.themes
  else
    ln -sf $RUNTIME/usr/share/themes $XDG_DATA_HOME
    ln -sfn $RUNTIME/usr/share/themes $SNAP_USER_DATA/.themes
  fi
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
      async_exec 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
    ensure_dir_exists $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
  async_exec 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
    ensure_dir_exists $GS_SCHEMA_DIR
    for ((i = 0; i < ${#data_dirs_array[@]}; i++)); do
      schema_dir="${data_dirs_array[$i]}/glib-2.0/schemas"
      if [ -f "$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
  async_exec 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
    ensure_dir_exists $DCONF_DEST_USER_DIR
    ln -s $REALHOME/.config/dconf/user $DCONF_DEST_USER_DIR
  fi
fi
# symlink the runtime dconf file as well
if [ -r $XDG_RUNTIME_DIR/../dconf/user ]; then
  ensure_dir_exists $XDG_RUNTIME_DIR/dconf
  ln -sf ../../dconf/user $XDG_RUNTIME_DIR/dconf/user
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 ] || [ ! -f $GDK_PIXBUF_MODULE_FILE ]; then
  rm -f $GDK_PIXBUF_MODULE_FILE
  if [ -f $RUNTIME/usr/lib/$ARCH/gdk-pixbuf-2.0/gdk-pixbuf-query-loaders ]; then
    async_exec $RUNTIME/usr/lib/$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
  ensure_dir_exists $XDG_DATA_HOME/icons
  for ((i = 0; i < ${#data_dirs_array[@]}; i++)); do
    # The runtime and theme content snaps should already contain icon caches
    # so we skip them to optimise app start time.
    if [[ "${data_dirs_array[$i]}" == "$SNAP/data-dir" || "${data_dirs_array[$i]}" == "$RUNTIME/"* ]]; then
      continue
    fi
    for theme in "${data_dirs_array[$i]}/icons/"*; do
      if [ -f "$theme/index.theme" -a ! -f "$theme/icon-theme.cache" ]; then
        theme_dir=$XDG_DATA_HOME/icons/$(basename "$theme")
        if [ ! -d "$theme_dir" ]; then
          ensure_dir_exists "$theme_dir"
          ln -s $theme/* "$theme_dir"
          if [ -f $RUNTIME/usr/sbin/update-icon-caches ]; then
            async_exec $RUNTIME/usr/sbin/update-icon-caches "$theme_dir"
          elif [ -f $RUNTIME/usr/sbin/update-icon-cache.gtk2 ]; then
            async_exec $RUNTIME/usr/sbin/update-icon-cache.gtk2 "$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=(gtk-3.0/settings.ini gtk-3.0/bookmarks gtk-2.0/gtkfilechooser.ini)
for f in ${gtk_configs[@]}; do
  dest="$XDG_CONFIG_HOME/$f"
  if [ ! -L "$dest" ]; then
    ensure_dir_exists `dirname $dest`
    ln -s $REALHOME/.config/$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
ensure_dir_exists $IBUS_CONFIG_PATH
[ -d $IBUS_CONFIG_PATH/bus ] && rm -rf $IBUS_CONFIG_PATH/bus
ln -sfn $REALHOME/.config/ibus/bus $IBUS_CONFIG_PATH