#!/bin/bash

#
#  Singe 2
#  Copyright (C) 2006-2024 Scott Duensing <scott@kangaroopunch.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public Licens
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#


G_BUILDROOT=${PWD}
G_BUILDDIR=.builddir
G_TARGET=
G_GENERATED=


function buildAll() {
	local OS=$1
	local ARCH=$2
	local COMMON=
	local OPT1=

	# Activate toolchain for this platform.
	source <(../toolchains/toolchains.sh use ${ARCH} ${OS})

	G_TARGET=${G_BUILDROOT}/${G_BUILDDIR}/${OS}/${ARCH}
	G_GENERATED=${G_TARGET}/generated
	COMMON="-DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${G_TARGET} -DCMAKE_TOOLCHAIN_FILE=${TOOLCHAIN_FILE}"

	export LDFLAGS="-L${G_TARGET}/lib ${LDFLAGS:-}"
	export CFLAGS="-I${G_TARGET}/include ${CFLAGS:-}"
	export CXXFLAGS="-I${G_TARGET}/include ${CXXFLAGS:-}"
	export LD_LIBRARY_PATH="${G_TARGET}/lib"
	# Our own libraries first, then the platform's (FFmpeg's hardware decoders need libva and libdrm).
	export PKG_CONFIG_LIBDIR="${G_TARGET}/lib/pkgconfig"
	if [[ "${OS}" == "linux" ]]; then
		export PKG_CONFIG_LIBDIR="${PKG_CONFIG_LIBDIR}:/usr/lib/${TRIPLE}/pkgconfig:/usr/lib/pkgconfig:/usr/share/pkgconfig"
	elif [[ "${OS}" == "pi" ]]; then
		export PKG_CONFIG_LIBDIR="${PKG_CONFIG_LIBDIR}:${SYSROOT}/usr/lib/${TRIPLE}/pkgconfig:${SYSROOT}/usr/lib/pkgconfig:${SYSROOT}/usr/share/pkgconfig"
		export PKG_CONFIG_SYSROOT_DIR="${SYSROOT}"
	fi

	mkdir -p ${G_GENERATED}

	# Needed for Pi sysroot.
	if [[ "${OS}" == "pi" ]]; then
		export CFLAGS="--sysroot=${SYSROOT} ${CFLAGS}"
		export CXXFLAGS="--sysroot=${SYSROOT} ${CXXFLAGS}"
		sudo chroot ${SYSROOT} apt-get -y install libasound-dev libxi-dev libvdpau-dev libdrm-dev
	fi

	pushd thirdparty/zlib
	clearAndEnterBuild
	CFLAGS="-I${PWD}" ../configure \
		--prefix=${G_TARGET} \
		--static
	make install
	popd

	pushd thirdparty/zstd
	clearAndEnterBuild
	cmake ${COMMON} \
		-DZSTD_BUILD_SHARED=off \
		-DZSTD_BUILD_STATIC=on \
		-DZSTD_BUILD_PROGRAMS=off \
		../build/cmake
	make install
	popd

	pushd thirdparty/SDL3
	clearAndEnterBuild
	cmake ${COMMON} \
		-DSDL_SHARED=off \
		-DSDL_STATIC=on \
		-DSDL_TESTS=off \
		-DSDL_EXAMPLES=off \
		..
	make install
	popd

	pushd thirdparty/SDL3_image
	clearAndEnterBuild
	# The vendored libpng must see the vendored zlib, not the one under ${G_TARGET}/include.
	CFLAGS="${CFLAGS#-I${G_TARGET}/include}" \
	cmake ${COMMON} \
		-DBUILD_SHARED_LIBS=off \
		-DSDLIMAGE_DEPS_SHARED=off \
		-DSDLIMAGE_SAMPLES=off \
		-DSDLIMAGE_TESTS=off \
		-DSDLIMAGE_VENDORED=on \
		-DSDLIMAGE_BACKEND_STB=off \
		-DSDLIMAGE_AVIF=off \
		-DSDLIMAGE_JXL=off \
		-DSDLIMAGE_TIF=off \
		-DSDLIMAGE_WEBP=on \
		-DSDL3_DIR=${G_TARGET}/lib/cmake/SDL3 \
		-DWEBP_BUILD_ANIM_UTILS=off \
		-DWEBP_BUILD_CWEBP=off \
		-DWEBP_BUILD_DWEBP=off \
		-DWEBP_BUILD_GIF2WEBP=off \
		-DWEBP_BUILD_IMG2WEBP=off \
		-DWEBP_BUILD_VWEBP=off \
		-DWEBP_BUILD_WEBPINFO=off \
		-DWEBP_BUILD_WEBPMUX=off \
		-DWEBP_BUILD_EXTRAS=off \
		..
	make install
	popd

	pushd thirdparty/SDL3_mixer
	clearAndEnterBuild
	cmake ${COMMON} \
		-DBUILD_SHARED_LIBS=off \
		-DSDLMIXER_DEPS_SHARED=off \
		-DSDLMIXER_VENDORED=on \
		-DSDLMIXER_EXAMPLES=off \
		-DSDLMIXER_TESTS=off \
		-DSDLMIXER_FLAC_LIBFLAC=off \
		-DSDLMIXER_MP3_MPG123=off \
		-DSDLMIXER_VORBIS_STB=on \
		-DSDLMIXER_VORBIS_VORBISFILE=off \
		-DSDLMIXER_VORBIS_TREMOR=off \
		-DSDLMIXER_GME=off \
		-DSDLMIXER_MIDI_FLUIDSYNTH=off \
		-DSDL3_DIR=${G_TARGET}/lib/cmake/SDL3 \
		-DWAVPACK_ENABLE_ASM=no \
		..
	make install
	popd

	pushd thirdparty/SDL3_ttf
	clearAndEnterBuild
	cmake ${COMMON} \
		-DBUILD_SHARED_LIBS=off \
		-DSDLTTF_VENDORED=on \
		-DSDLTTF_HARFBUZZ=off \
		-DSDLTTF_PLUTOSVG=off \
		-DSDLTTF_SAMPLES=off \
		-DSDL3_DIR=${G_TARGET}/lib/cmake/SDL3 \
		..
	make install
	popd

	pushd thirdparty/openssl
	clearAndEnterBuild
	if [[ "${OS}" == "windows" ]]; then
		if [[ "${ARCH}" == "x86" ]]; then
			OPT1="mingw"
		else
			OPT1="mingw64"
		fi
	else
		OPT1=""
	fi
	if [[ "${OS}" == "pi" ]]; then
		if [[ "${ARCH}" == "aarch64" ]]; then
			OPT1="linux-aarch64"
		else
			OPT1="linux-arm4"
		fi
	fi
	if [[ "${OS}" == "macos" ]]; then
		if [[ "${ARCH}" == "aarch64" ]]; then
			OPT1="darwin64-arm64"
		else
			OPT1="darwin64-x86_64"
		fi
	fi
	../Configure ${OPT1} \
		--prefix="${G_TARGET}" \
		--libdir=lib \
		--with-zlib-include="${G_TARGET}/include" \
		--with-zlib-lib="${G_TARGET}/lib" \
		--with-zstd-include="${G_TARGET}/include" \
		--with-zstd-lib="${G_TARGET}/lib" \
		no-apps \
		no-docs \
		no-dso \
		no-dynamic-engine \
		no-module \
		no-shared \
		no-tests \
		zlib \
		enable-zstd
	make build_sw
	make install_sw
	popd

	if [[ "${OS}" == "pi" ]]; then
		# Hack to make ffmpeg compile.
		mkdir -p "${G_TARGET}/include/sys"
		echo "/* File no longer used */" > "${G_TARGET}/include/sys/sysctl.h"
	fi
	# Hardware decoding:  each platform's native API.  The libraries these pull in are read back
	# from FFmpeg's pkg-config files by CMakeLists.txt, so the link follows this choice.
	case "${OS}" in
		linux)   HWACCEL="--enable-vaapi --enable-vdpau --enable-libdrm" ;;
		pi)      HWACCEL="--enable-v4l2-m2m --enable-libdrm" ;;
		macos)   HWACCEL="--enable-videotoolbox" ;;
		windows) HWACCEL="--enable-d3d11va --enable-dxva2" ;;
		*)       HWACCEL="" ;;
	esac
	pushd thirdparty/ffmpeg
	clearAndEnterBuild
	# https://trac.ffmpeg.org/wiki/CompilationGuide/CrossCompilingForWindows
	../configure \
		--enable-static \
		--disable-shared \
		--disable-debug \
		--disable-muxers \
		${HWACCEL} \
		--disable-encoders \
		--disable-filters \
		--disable-network \
		--disable-devices \
		--disable-bzlib \
		--disable-lzma \
		--disable-doc \
		--disable-programs \
		--enable-gpl \
		--enable-version3 \
		--extra-ldflags="-L${G_TARGET}/lib" \
		--prefix=${G_TARGET} \
		--arch=${ARCH} \
		--target-os=${CROSS_OS} \
		--cross-prefix=${TRIPLE}- \
		--cc="${CC}" \
		--cxx="${CXX}" \
		--ranlib="${RANLIB}"
	make install
	popd

	# Embedded resources, the version header, and the manual are generated by CMake.

	pushd ${G_TARGET}
	clearAndEnterBuild
	cmake ${COMMON} -DKANGAROO_OS=${OS} -DKANGAROO_ARCH=${ARCH} ${G_BUILDROOT}
	make
	# CMake names the binary Singe-v<version>-<Os>-<arch>.
	mv -f Singe-v*${SUFFIX} ${G_BUILDROOT}/${G_BUILDDIR}/.
	popd
}


function clearAndEnterBuild() {
	[[ -d ${G_BUILDDIR} ]] && rm -rf ${G_BUILDDIR}
	mkdir -p ${G_BUILDDIR}
	cd ${G_BUILDDIR}
}


# -e = stop script on errors
# -u = stop script on undefined variable
# -o pipefail = stop pipeline if any step fails
set -euo pipefail
export MAKEFLAGS="${MAKEFLAGS:--j$(nproc)}"

if [[ ! -x ../toolchains/toolchains.sh ]]; then
	echo "error: ../toolchains/toolchains.sh not found (see INSTALL)" >&2
	exit 1
fi


mkdir -p ${G_BUILDDIR}


# These are required for the build.
sudo apt-get install -y \
	imagemagick \
	lua5.4 \
	ffmpeg \
	asciidoctor \
	ruby-asciidoctor-pdf \
	autoconf \
	automake \
	libtool \
	libasound-dev \
	libxi-dev \
	libvdpau-dev \
	libva-dev \
	libdrm-dev


# Usage:  build-all.sh [os arch]   (default:  every supported platform)
if [[ $# -eq 2 ]]; then
	buildAll "$1" "$2" 2>&1 | tee ${G_BUILDDIR}/$1-$2.log
else
	buildAll linux   x86_64  2>&1 | tee ${G_BUILDDIR}/linux-x86_64.log
	buildAll macos   aarch64 2>&1 | tee ${G_BUILDDIR}/macos-aarch64.log
	buildAll pi      aarch64 2>&1 | tee ${G_BUILDDIR}/pi-aarch64.log
	buildAll windows x86_64  2>&1 | tee ${G_BUILDDIR}/windows-x86_64.log
fi


# === UNSUPPORTED ===

#buildAll macos   x86_64  2>&1 | tee ${G_BUILDDIR}/macos-x86_64.log
#buildAll linux x86
#buildAll macos x86   #***TODO*** Needs older SDL2
#buildAll windows x86