#!/usr/bin/env bash

# exit when any command fails
set -e

ARCH=${ARCH:-$(uname -m)}

# https://stackoverflow.com/a/246128
SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)
ROOT_DIR=$(realpath $SCRIPT_DIR/..)
VULKAN_DIR=$ROOT_DIR/vulkan
UI_DIR=$ROOT_DIR/ui
XR_DRIVER_DIR=$ROOT_DIR/modules/XRLinuxDriver

if [ -z "$GNOME_BACKPORT" ]; then
  # standard build for GNOME 45 and up
  echo "Building Breezy GNOME for $ARCH, GNOME versions 45 and up"
  GNOME_DIR=$ROOT_DIR/gnome
  BUILD_FILE_NAME=breezyGNOME-$ARCH.tar.gz
else
  # special build process for backports
  echo "Building Breezy GNOME backport \"$GNOME_BACKPORT\" for $ARCH"

  # strip the prefix "gnome-" from the backport name, if it's there
  GNOME_BACKPORT_NAME=${GNOME_BACKPORT#gnome-}

  GNOME_DIR=$ROOT_DIR/gnome/backports/$GNOME_BACKPORT/gnome
  UI_DIR=$ROOT_DIR/gnome/backports/$GNOME_BACKPORT/ui
  BUILD_FILE_NAME=breezyGNOME-$GNOME_BACKPORT_NAME-$ARCH.tar.gz
  rm -rf $GNOME_DIR/build

  pushd $GNOME_DIR
  git submodule update --init
  popd
fi
GNOME_BUILD_DIR=$GNOME_DIR/build

mkdir -p $GNOME_BUILD_DIR
if [ -e "$GNOME_BUILD_DIR/$BUILD_FILE_NAME" ]; then
  rm $GNOME_BUILD_DIR/$BUILD_FILE_NAME
fi

PACKAGE_DIR=$GNOME_BUILD_DIR/breezy_gnome
rm -rf $PACKAGE_DIR
mkdir -p $PACKAGE_DIR

source $XR_DRIVER_DIR/bin/inject_ua

# if a custom_banner image exists, copy it over the sombrero one
if [ -e "$VULKAN_DIR/custom_banner.png" ]; then
  cp $VULKAN_DIR/custom_banner.png $PACKAGE_DIR
fi

# copy vulkan setup scripts and configs
mkdir -p $PACKAGE_DIR/bin
copy_and_inject_ua "$XR_DRIVER_DIR/bin/ua.sh" "$PACKAGE_DIR/bin" "$GNOME_DIR/bin/setup" "$GNOME_DIR/bin/breezy_gnome_verify" "$GNOME_DIR/bin/breezy_gnome_uninstall"

XR_DRIVER_BINARY_NAME=xrDriver-$ARCH.tar.gz
XR_DRIVER_BINARY="$XR_DRIVER_DIR/out/$XR_DRIVER_BINARY_NAME"

if [ ! -e "$XR_DRIVER_BINARY" ] || [ "$1" == "--rebuild-driver" ] || [ "$1" == "--rebuild-all" ]; then
  # if a file exists at custom_banner_config.yml, copy it to the xrealAirLinuxDriver directory
  if [ -e "$VULKAN_DIR/custom_banner_config.yml" ]; then
    cp $VULKAN_DIR/custom_banner_config.yml $XR_DRIVER_DIR
  fi

  pushd $XR_DRIVER_DIR

  # strange issue where the base library produces a .so file if the build is not cleaned
  rm -rf build/

  docker-build/init.sh
  docker-build/run-build.sh $ARCH
  popd
fi

TMP_DIR=$(mktemp -d -t breezy-gnome-XXXXXXXXXX)
pushd $TMP_DIR
cp "$XR_DRIVER_BINARY" "$TMP_DIR/$XR_DRIVER_BINARY_NAME"
tar -xf "$TMP_DIR/$XR_DRIVER_BINARY_NAME"

XR_DRIVER_MANIFEST_LINE=$(sha256sum xr_driver/manifest)
popd
rm -rf $TMP_DIR

cp $XR_DRIVER_BINARY $PACKAGE_DIR/$XR_DRIVER_BINARY_NAME
cp $XR_DRIVER_DIR/bin/xr_driver_setup $PACKAGE_DIR/bin

$GNOME_DIR/bin/package_extension
cp $GNOME_DIR/out/breezydesktop@xronlinux.com.shell-extension.zip $PACKAGE_DIR

# create a checksum that combines the checksums of all files in the directory
pushd $GNOME_DIR/src
GNOME_MANIFEST_LINE=$(find -L . -type f ! -name "*.compiled" -exec sha256sum {} \; | sort | sha256sum | sed 's/ .*//')
popd

UI_BUILD_ARTIFACT=$UI_DIR/out/breezyUI-$ARCH.tar.gz
if [ ! -e "$UI_BUILD_ARTIFACT" ] || [ "$1" == "--rebuild-ui" ] || [ "$1" == "--rebuild-all" ]; then
  pushd $UI_DIR
  bin/package $ARCH
  popd
fi
tar -xf $UI_BUILD_ARTIFACT -C $PACKAGE_DIR

# create manifest file for verifying installed file checksums against the originally packaged versions
# include any file that doesn't get modified during setup (e.g. vkBasalt.json files)
pushd $PACKAGE_DIR
echo $XR_DRIVER_MANIFEST_LINE > manifest
echo -e "$GNOME_MANIFEST_LINE breezydesktop@xronlinux.com" >> manifest
popd

# bundle everything up
pushd $GNOME_BUILD_DIR
tar -zcvf $BUILD_FILE_NAME breezy_gnome
popd

mkdir -p out
if [ -e "out/$BUILD_FILE_NAME" ]; then
  rm out/$BUILD_FILE_NAME
fi
cp $GNOME_BUILD_DIR/$BUILD_FILE_NAME out