#!/bin/bash -e


#
# Kangaroo Punch Toolchains
# Copyright 2023-2024 Scott Duensing  <scott@kangaroopunch.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#


TC_G_SCRIPT_PATH="${BASH_SOURCE}"
while [ -L "${TC_G_SCRIPT_PATH}" ]; do
	TC_G_SCRIPT_DIR="$(cd -P "$(dirname "${TC_G_SCRIPT_PATH}")" >/dev/null 2>&1 && pwd)"
	TC_G_SCRIPT_PATH="$(readlink "${TC_G_SCRIPT_PATH}")"
	[[ ${TC_G_SCRIPT_PATH} != /* ]] && TC_G_SCRIPT_PATH="${TC_G_SCRIPT_DIR}/${TC_G_SCRIPT_PATH}"
done
TC_G_SCRIPT_PATH="$(readlink -f "${TC_G_SCRIPT_PATH}")"
TC_G_SCRIPT_DIR="$(cd -P "$(dirname -- "${TC_G_SCRIPT_PATH}")" >/dev/null 2>&1 && pwd)"
TC_G_SCRIPT=$(basename ${TC_G_SCRIPT_PATH})


TC_G_PIURL=https://github.com/tttapa/docker-arm-cross-toolchain/releases/latest/download/x-tools-


function buildMacOSXToolchain() {
	local SDK=$1
	local XCODE=$2
	local PLATFORM=$3
	local CLANG=
	local RTPATH=
	local CROSSTOOLS="${TC_G_SCRIPT_DIR}/x-tools/${PLATFORM}"

	mkdir -p work

	if [[ ! -d work/osxcross ]]; then
		git clone https://github.com/tpoechtrager/osxcross.git work/osxcross
		sudo work/osxcross/tools/get_dependencies.sh
	fi

	if [[ ! -f x-tools/${PLATFORM}/toolchain.cmake ]]; then
		pushd work/osxcross
			# Have we built Apple's clang?
			if [[ ! -d "${TC_G_SCRIPT_DIR}/clang" ]]; then
				UNATTENDED=1 INSTALLPREFIX=${TC_G_SCRIPT_DIR}/clang ./build_apple_clang.sh
				pushd build/clang*/build_stage2
					make install
				popd
			fi
			# Use our fresh new clang.
			source <("${CROSSTOOLS}/bin/osxcross-conf" 2>/dev/null)
			export PATH="${TC_G_SCRIPT_DIR}/clang/bin:${CROSSTOOLS}/bin:${PATH}"
			export CC="${TC_G_SCRIPT_DIR}/clang/bin/clang"
			export CXX="${TC_G_SCRIPT_DIR}/clang/bin/clang++"
			# Do we have an existing SDK tarball?
			if [[ ! -f "${TC_G_SCRIPT_DIR}/${SDK}" ]]; then
				# Nope.  Build tarball and keep for later.
				./tools/gen_sdk_package_pbzx.sh "${TC_G_SCRIPT_DIR}/${XCODE}"
				mv -f MacOSX* "${TC_G_SCRIPT_DIR}/."
			fi
			# Put tarball in place.
			cp -f "${TC_G_SCRIPT_DIR}/${SDK}" tarballs/.
			# Build SDK.
			UNATTENDED=1 TARGET_DIR="${CROSSTOOLS}" ./build.sh
			# Fix fubar in osxcross.
			[[ -d target ]] && rm -rf target
			ln -sf "${CROSSTOOLS}" target
:<<NO_GCC
			# Build GCC
			# Fix another fubar in osxcross.
			if [[ ! -f build_gcc-fixed.sh ]]; then
				sed '/^pushd gcc.*/a \.\/contrib\/download_prerequisites' build_gcc.sh > build_gcc-fixed.sh
				chmod +x build_gcc-fixed.sh
			fi
			TARGET_DIR="${CROSSTOOLS}" ./build_gcc-fixed.sh
NO_GCC
			# Build compiler runtime.
			#***TODO*** This fails to find <optional> for x86.
			RTPATH="${TC_G_SCRIPT_DIR}/clang/lib/clang"
			CLANG=$(ls -1 "${RTPATH}" | grep -F . | sort | tail -n1)
			if [[ "${CLANG}" == "" ]]; then
				CLANG=$(ls -1 "${RTPATH}" | sort | tail -n1)
			fi
			RTPATH="${RTPATH}/${CLANG}/lib/darwin"
			if [[ -d "${RTPATH}" ]]; then
				rm -rf "${RTPATH}"
			fi
			CXX_FLAGS="-std=c++17" ENABLE_COMPILER_RT_INSTALL=1 ./build_compiler_rt.sh
			if [[ -d "${RTPATH}" ]]; then
				mv -f "${RTPATH}" "${CROSSTOOLS}/."
				echo "RTPATH=\"${RTPATH}\"" > ${CROSSTOOLS}/rtpath.inc
			fi
			# Tidy up for next build.
			./cleanup.sh
		popd
	fi
}


function install_x86_64_linux() {
	# Required tools for Linux x86_64.  These should always be installed.
	sudo apt-get install -y \
		autoconf \
		binutils \
		bison \
		build-essential \
		clang \
		cmake \
		cmake-curses-gui \
		curl \
		flex \
		git \
		git-lfs \
		liblzma-dev \
		libtool \
		nasm \
		texinfo \
		unzip \
		zlib1g-dev
}


function install_x86_linux() {
	# x86 Linux support.
	sudo dpkg --add-architecture i386
	sudo apt-get install -y \
		gcc-i686-linux-gnu \
		g++-i686-linux-gnu
}


function install_x86_64_windows() {
	# x86 and x86_64 Windows.
	sudo apt-get install -y mingw-w64
}


function install_x86_windows() {
	# x86 Windows.
	install_x86_64_windows
}


function install_aarch64_pi() {
	# Raspberry Pi, aarch64.
	wget -O- ${TC_G_PIURL}aarch64-rpi3-linux-gnu.tar.xz | tar xJ
	#***TODO*** sysroot
}


function install_armv6_pi() {
	# Raspberry Pi, armv6.
	wget -O- ${TC_G_PIURL}armv6-rpi-linux-gnueabihf.tar.xz | tar xJ
	#***TODO*** sysroot
}


function install_armv8_pi() {
	# Raspberry Pi, armv8.
	wget -O- ${TC_G_PIURL}armv8-rpi3-linux-gnueabihf.tar.xz | tar xJ
	#***TODO*** sysroot
}



function install_x86_64_macos() {
	# MacOS x86_64.
	#***TODO***  https://stackoverflow.com/questions/67712376/after-updating-gcc-clang-cant-find-libstdc-anymore
	buildMacOSXToolchain MacOSX10.13.sdk.tar.xz Xcode_9.4.1.xip x86_64-macos-apple
}


function install_x86_macos() {
	# MacOS x86.
	install_x86_64_macos
}


function install_aarch64_macos() {
	# MacOS aarch64.
	#***TODO***  https://stackoverflow.com/questions/67712376/after-updating-gcc-clang-cant-find-libstdc-anymore
	buildMacOSXToolchain MacOSX13.3.sdk.tar.xz Xcode_14.3.1.xip aarch64-macos-apple
}


function install_x86_dos() {
	# DJGPP for DOS.
	export DJGPP_PREFIX=$(pwd)/x-tools/djgpp

	mkdir -p work

	if [[ ! -d work/build-djgpp ]]; then
		git clone https://github.com/andrewwutw/build-djgpp.git work/build-djgpp
	fi

	if [[ ! -f x-tools/djgpp/setenv ]]; then
		pushd work/build-djgpp
			./build-djgpp.sh 12.2.0
		popd
	fi
}


function use_toolchain() {
	local ARCH=$1
	local PLAT=$2

	case "${PLAT}" in

		linux)
			case "${ARCH}" in
				x86)
					TRIPLE="i686-linux-gnu"
					;;
				x86_64)
					TRIPLE="x86_64-linux-gnu"
					;;
			esac
			CROSS_OS="linux"
			CC="${TRIPLE}-gcc"
			CXX="${TRIPLE}-g++"
			RANLIB="${TRIPLE}-ranlib"
			;;

		macos)
			case "${ARCH}" in
				aarch64)
					TRIPLE="aarch64-apple-darwin22.4"
					OSXCROSS_LOCATION=${TC_G_SCRIPT_DIR}/x-tools/aarch64-macos-apple
					;;
				x86)
					TRIPLE="i386-apple-darwin17"
					OSXCROSS_LOCATION=${TC_G_SCRIPT_DIR}/x-tools/x86_64-macos-apple
					;;
				x86_64)
					TRIPLE="x86_64-apple-darwin17"
					OSXCROSS_LOCATION=${TC_G_SCRIPT_DIR}/x-tools/x86_64-macos-apple
					;;
			esac
			CROSS_OS="darwin"
			CC="${OSXCROSS_LOCATION}/bin/${TRIPLE}-clang"
			CXX="${OSXCROSS_LOCATION}/bin/${TRIPLE}-clang++"
			RANLIB="${OSXCROSS_LOCATION}/bin/${TRIPLE}-ranlib"
			"${OSXCROSS_LOCATION}/bin/osxcross-conf" 2>/dev/null
			echo "export OSXCROSS_LOCATION=\"${OSXCROSS_LOCATION}\""
			echo "export LDFLAGS=\"-fuse-ld=${OSXCROSS_LOCATION}/bin/${TRIPLE}-ld\""
			echo "export PATH=\"${OSXCROSS_LOCATION}/bin:${PATH}\""
			echo "export OSXCROSS_PKG_CONFIG_USE_NATIVE_VARIABLES=1"
			;;

		pi)
			case "${ARCH}" in
				aarch64)
					TRIPLE="aarch64-rpi3-linux-gnu"
					;;
				armv6)
					TRIPLE="armv6-rpi-linux-gnueabihf"
					;;
				armv8)
					TRIPLE="armv8-rpi3-linux-gnueabihf"
					;;
			esac
			CROSS_OS="linux"
			CC="${TRIPLE}-gcc"
			CXX="${TRIPLE}-g++"
			RANLIB="${TRIPLE}-ranlib"
			;;

		windows)
			case "${ARCH}" in
				x86)
					TRIPLE="i686-w64-mingw32"
					;;
				x86_64)
					TRIPLE="x86_64-w64-mingw32"
					;;
			esac
			CC="${TRIPLE}-gcc-posix"
			CXX="${TRIPLE}-g++-posix"
			RANLIB="${TRIPLE}-ranlib"
			SUFFIX=".exe"
			CROSS_OS="mingw32"
			;;

	esac

	echo "export TOOLCHAIN_FILE=\"${TC_G_SCRIPT_DIR}/cmake/${TRIPLE}.cmake\""
	echo "export CC=\"${CC}\""
	echo "export CXX=\"${CXX}\""
	echo "export RANLIB=\"${RANLIB}\""
	echo "export SUFFIX=\"${SUFFIX}\""
	echo "export CROSS_OS=\"${CROSS_OS}\""
	echo "export TRIPLE=\"${TRIPLE}\""
}


MODE=$1
ARCH=$2
PLAT=$3

HELP=1

COLS=2
ROWS=11
row=0
declare -A PLATFORMS=()
PLATFORMS[0]="x86_64";   PLATFORMS[1]="linux"
PLATFORMS[2]="x86";      PLATFORMS[3]="linux"
PLATFORMS[4]="x86_64";   PLATFORMS[5]="windows"
PLATFORMS[6]="x86";      PLATFORMS[7]="windows"
PLATFORMS[8]="aarch64";  PLATFORMS[9]="pi"
PLATFORMS[10]="armv6";   PLATFORMS[11]="pi"
PLATFORMS[12]="armv8";   PLATFORMS[13]="pi"
PLATFORMS[14]="x86_64";  PLATFORMS[15]="macos"
PLATFORMS[16]="x86";     PLATFORMS[17]="macos"
PLATFORMS[18]="aarch64"; PLATFORMS[19]="macos"
PLATFORMS[20]="x86";     PLATFORMS[21]="dos"

if [[ "${MODE}" == "install" ]]; then
	# Install all toolchains.
	if [[ "${ARCH}" == "all" && "${PLAT}" == "all" ]]; then
		HELP=0
		for (( row=0; row<ROWS; row++ )); do
			set -x
			install_${PLATFORMS[$((${COLS}*${row}))]}_${PLATFORMS[$((${COLS}*${row}+1))]}
			set +x
		done
	fi

	# Install all toolchains for a specific platform.
	if [[ "${ARCH}" == "all" && "${PLAT}" != "all" ]]; then
		HELP=0
		for (( row=0; row<ROWS; row++ )); do
			if [[ "${PLAT}" == "${PLATFORMS[$((${COLS}*${row}+1))]}" ]]; then
				set -x
				install_${PLATFORMS[$((${COLS}*${row}))]}_${PLAT}
				set +x
			fi
		done
	fi

	# Install a single toolchain.
	if [[ "${ARCH}" != "all" && "${PLAT}" != "all" ]]; then
		for (( row=0; row<ROWS; row++ )); do
			if [[ "${ARCH}" == "${PLATFORMS[$((${COLS}*${row}))]}" && "${PLAT}" == "${PLATFORMS[$((${COLS}*${row}+1))]}" ]]; then
				HELP=0
				set -x
				install_${ARCH}_${PLAT}
				set +x
			fi
		done
	fi
fi

if [[ "${MODE}" == "use" ]]; then
	for (( row=0; row<ROWS; row++ )); do
		if [[ "${ARCH}" == "${PLATFORMS[$((${COLS}*${row}))]}" && "${PLAT}" == "${PLATFORMS[$((${COLS}*${row}+1))]}" ]]; then
			HELP=0
			use_toolchain ${ARCH} ${PLAT}
		fi
	done
fi

# Do they need help?
if [[ ${HELP} -eq 1 ]]; then
	cat <<-HELP

		Kangaroo Punch Toolchain Installer
		http://skunkworks.kangaroopunch.com

		Usage:  ${TC_G_SCRIPT} [install|use] [architecture] [platform]

		Where [architecture] and [platform] are one of:

	HELP
	for (( row=0; row<ROWS; row++ )); do
		printf '   %-10s %s\n' "${PLATFORMS[$((${COLS}*${row}))]}" "${PLATFORMS[$((${COLS}*${row}+1))]}"
	done
	cat <<-HELP

		For "install" mode:

		    If [architecture] and [platform] are both "all",
		    everything will be installed.

		    if [architecture] is "all", then all available
		    architectures for the specified [platform] will
		    be installed.

		    NOTE:  You should always install x86_64 linux
		           before attempting to install other
		           toolchains.

		For "use" mode:

		    Souce the output of this script to set the environment
		    to use the appropriate toolchain for [architecture] and
		    [platform].

	HELP
fi