#!/usr/bin/env bash

set -euo pipefail

cd "$(dirname "${BASH_SOURCE[0]}")/../.."

source Packaging/OpenDingux/targets.sh
source Packaging/OpenDingux/package-opk.sh

usage() {
  echo "Usage: build.sh [target]"
  usage_target
}

if ! check_target "$@"; then
  usage
  exit 64
fi

declare -r TARGET="$1"
declare -r BUILD_DIR="build-${TARGET}"
declare -rA BUILDROOT_REPOS=(
	[lepus]=https://github.com/OpenDingux/buildroot.git
	[retrofw]=https://github.com/retrofw/buildroot.git
	[rg350]=https://github.com/OpenDingux/buildroot.git
	[gkd350h]=https://github.com/tonyjih/RG350_buildroot.git
)
declare -rA BUILDROOT_DEFCONFIGS=(
	[lepus]='od_lepus_defconfig BR2_EXTERNAL=board/opendingux'
	[retrofw]='RetroFW_defconfig BR2_EXTERNAL=retrofw'
	[rg350]='od_gcw0_defconfig BR2_EXTERNAL=board/opendingux'
	[gkd350h]='rg350_defconfig BR2_EXTERNAL=board/opendingux'
)

declare BUILDROOT_TARGET="$TARGET"

# If a TOOLCHAIN environment variable is set, just use that.
if [[ -z ${TOOLCHAIN:-} ]]; then
	BUILDROOT="${BUILDROOT:-$HOME/devilutionx-buildroots/$BUILDROOT_TARGET}"
	TOOLCHAIN="${BUILDROOT}/output/host"
fi

main() {
	>&2 echo "Building for target ${TARGET} in ${BUILD_DIR}"
	set -x
	if [[ -n ${BUILDROOT:-} ]]; then
		prepare_buildroot
		make_buildroot
	fi
	build
	package_opk
}

prepare_buildroot() {
	if [[ -d $BUILDROOT ]]; then
		return
	fi
	git clone --depth=1 "${BUILDROOT_REPOS[$BUILDROOT_TARGET]}" "$BUILDROOT"
	cd "$BUILDROOT"
	ln -s ../shared-dl dl

	# Work around a BR2_EXTERNAL initialization bug in older buildroots.
	mkdir -p output
	touch output/.br-external.mk

	make ${BUILDROOT_DEFCONFIGS[$BUILDROOT_TARGET]}
	cd -
}

make_buildroot() {
	cd "$BUILDROOT"
	BR2_JLEVEL=0 make toolchain sdl
	cd -
}

cmake_configure() {
	# libzt uses `-fstack-protector` GCC flag by default.
	# We disable `-fstack-protector` because it isn't supported by target libc.
	cmake -S. -B"$BUILD_DIR" \
		"-DTARGET_PLATFORM=$TARGET" \
		-DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN}/usr/share/buildroot/toolchainfile.cmake" \
		-DBUILD_TESTING=OFF \
		-DDEVILUTIONX_SYSTEM_LIBSODIUM=OFF \
		-DDEVILUTIONX_SYSTEM_BZIP2=OFF \
		-DSTACK_PROTECTOR=OFF \
		"$@"
}

cmake_build() {
	cmake --build "$BUILD_DIR" -j "$(getconf _NPROCESSORS_ONLN)"
}

strip_bin() {
	"${TOOLCHAIN}/usr/bin/"*-linux-strip -s -R .comment -R .gnu.version "${BUILD_DIR}/devilutionx"
}

build_debug() {
	cmake_configure -DCMAKE_BUILD_TYPE=Debug -DASAN=OFF -DUBSAN=OFF -DCMAKE_CXX_FLAGS_DEBUG="-g -fno-omit-frame-pointer"
	cmake_build
}

build_relwithdebinfo() {
	cmake_configure -DCMAKE_BUILD_TYPE=RelWithDebInfo
	cmake_build
}

build_release() {
	cmake_configure -DCMAKE_BUILD_TYPE=Release
	cmake_build
	strip_bin
}

build() {
	rm -f "${BUILD_DIR}/CMakeCache.txt"
	build_release
}

main