#!/usr/bin/env bash
set -e
# This file will need to be run in bash, for now.


# === CONFIGURATION AND SETUP ===

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

echo "$DIR"

ARCH=${ARCH:-"i686"}
TARGET="$ARCH-pc-serenity"
PREFIX="$DIR/Local/$ARCH"
BUILD=$(realpath "$DIR/../Build")
SYSROOT="$BUILD/Root"

MAKE="make"
MD5SUM="md5sum"
NPROC="nproc"

if command -v ginstall &>/dev/null; then
    INSTALL=ginstall
else
    INSTALL=install
fi

if [ "$(uname -s)" = "OpenBSD" ]; then
    MAKE=gmake
    MD5SUM="md5 -q"
    NPROC="sysctl -n hw.ncpuonline"
    export CC=egcc
    export CXX=eg++
    export with_gmp=/usr/local
    export LDFLAGS=-Wl,-z,notext
elif [ "$(uname -s)" = "FreeBSD" ]; then
    MAKE=gmake
    MD5SUM="md5 -q"
    NPROC="sysctl -n hw.ncpu"
    export with_gmp=/usr/local
    export with_mpfr=/usr/local
fi

git_patch=
while [ "$1" != "" ]; do
    case $1 in
        --dev )           git_patch=1
                          ;;
    esac
    shift
done

echo PREFIX is "$PREFIX"
echo SYSROOT is "$SYSROOT"

mkdir -p "$DIR/Tarballs"

BINUTILS_VERSION="2.35.1"
BINUTILS_MD5SUM="bca600eea3b8fc33ad3265c9c1eee8d4"
BINUTILS_NAME="binutils-$BINUTILS_VERSION"
BINUTILS_PKG="${BINUTILS_NAME}.tar.gz"
BINUTILS_BASE_URL="http://ftp.gnu.org/gnu/binutils"

GCC_VERSION="10.2.0"
GCC_MD5SUM="941a8674ea2eeb33f5c30ecf08124874"
GCC_NAME="gcc-$GCC_VERSION"
GCC_PKG="${GCC_NAME}.tar.gz"
GCC_BASE_URL="http://ftp.gnu.org/gnu/gcc"


# === CHECK CACHE AND REUSE ===

pushd "$DIR"
    if [ "${TRY_USE_LOCAL_TOOLCHAIN}" = "y" ] ; then
        # The actual logic had to be moved to .github/workflows/cmake.yml.
        # Github Actions guarantees that Toolchain/Cache/ is empty on a cache
        # miss, and non-empty on a cache hit.
        # The following logic is correct *only* because of that.

        mkdir -p Cache
        echo "Cache (before):"
        ls -l Cache
        CACHED_TOOLCHAIN_ARCHIVE="Cache/ToolchainBinariesGithubActions.tar.gz"
        if [ -r "${CACHED_TOOLCHAIN_ARCHIVE}" ] ; then
            echo "Cache at ${CACHED_TOOLCHAIN_ARCHIVE} exists!"
            echo "Extracting toolchain from cache:"
            if tar xzf "${CACHED_TOOLCHAIN_ARCHIVE}" ; then
                echo "Done 'building' the toolchain."
                echo "Cache unchanged."
                exit 0
            else
                echo
                echo
                echo
                echo "Could not extract cached toolchain archive."
                echo "This means the cache is broken and *should be removed*!"
                echo "As Github Actions cannot update a cache, this will unnecessarily"
                echo "slow down all future builds for this hash, until someone"
                echo "resets the cache."
                echo
                echo
                echo
                rm -f "${CACHED_TOOLCHAIN_ARCHIVE}"
            fi
        else
            echo "Cache at ${CACHED_TOOLCHAIN_ARCHIVE} does not exist."
            echo "Will rebuild toolchain from scratch, and save the result."
        fi
        echo "::group::Actually building Toolchain"
    fi
popd


# === DOWNLOAD AND PATCH ===

pushd "$DIR/Tarballs"
    md5="$($MD5SUM $BINUTILS_PKG | cut -f1 -d' ')"
    echo "bu md5='$md5'"
    if [ ! -e $BINUTILS_PKG ] || [ "$md5" != ${BINUTILS_MD5SUM} ] ; then
        rm -f $BINUTILS_PKG
        curl -LO "$BINUTILS_BASE_URL/$BINUTILS_PKG"
    else
        echo "Skipped downloading binutils"
    fi

    md5="$($MD5SUM ${GCC_PKG} | cut -f1 -d' ')"
    echo "gc md5='$md5'"
    if [ ! -e $GCC_PKG ] || [ "$md5" != ${GCC_MD5SUM} ] ; then
        rm -f $GCC_PKG
        curl -LO "$GCC_BASE_URL/$GCC_NAME/$GCC_PKG"
    else
        echo "Skipped downloading gcc"
    fi

    if [ ! -d ${BINUTILS_NAME} ]; then
        echo "Extracting binutils..."
        tar -xzf ${BINUTILS_PKG}

        pushd ${BINUTILS_NAME}
            if [ "$git_patch" = "1" ]; then
                git init > /dev/null
                git add . > /dev/null
                git commit -am "BASE" > /dev/null
                git apply "$DIR"/Patches/binutils.patch > /dev/null
            else
                patch -p1 < "$DIR"/Patches/binutils.patch > /dev/null
            fi
        popd
    else
        echo "Skipped extracting binutils"
    fi

    if [ ! -d $GCC_NAME ]; then
        echo "Extracting gcc..."
        tar -xzf $GCC_PKG
        pushd $GCC_NAME
            if [ "$git_patch" = "1" ]; then
                git init > /dev/null
                git add . > /dev/null
                git commit -am "BASE" > /dev/null
                git apply "$DIR"/Patches/gcc.patch > /dev/null
            else
                patch -p1 < "$DIR/Patches/gcc.patch" > /dev/null
            fi
        popd
    else
        echo "Skipped extracting gcc"
    fi

    if [ "$(uname)" = "Darwin" ]; then
        pushd "gcc-${GCC_VERSION}"
        ./contrib/download_prerequisites
        popd
    fi

popd


# === COMPILE AND INSTALL ===

mkdir -p "$PREFIX"
mkdir -p "$DIR/Build/$ARCH/binutils"
mkdir -p "$DIR/Build/$ARCH/gcc"

if [ -z "$MAKEJOBS" ]; then
    MAKEJOBS=$($NPROC)
fi

pushd "$DIR/Build/$ARCH"
    unset PKG_CONFIG_LIBDIR # Just in case

    pushd binutils
        echo "XXX configure binutils"
        "$DIR"/Tarballs/$BINUTILS_NAME/configure --prefix="$PREFIX" \
                                                 --target="$TARGET" \
                                                 --with-sysroot="$SYSROOT" \
                                                 --enable-shared \
                                                 --disable-nls \
                                                 ${TRY_USE_LOCAL_TOOLCHAIN:+"--quiet"} || exit 1
        if [ "$(uname)" = "Darwin" ]; then
            # under macOS generated makefiles are not resolving the "intl"
            # dependency properly to allow linking its own copy of
            # libintl when building with --enable-shared.
            "$MAKE" -j "$MAKEJOBS" || true
            pushd intl
            "$MAKE" all-yes
            popd
        fi
        echo "XXX build binutils"
        "$MAKE" -j "$MAKEJOBS" || exit 1
        "$MAKE" install || exit 1
    popd

    pushd gcc
        if [ "$(uname -s)" = "OpenBSD" ]; then
            perl -pi -e 's/-no-pie/-nopie/g' "$DIR/Tarballs/gcc-$GCC_VERSION/gcc/configure"
        fi

        echo "XXX configure gcc and libgcc"
        "$DIR/Tarballs/gcc-$GCC_VERSION/configure" --prefix="$PREFIX" \
                                            --target="$TARGET" \
                                            --with-sysroot="$SYSROOT" \
                                            --disable-nls \
                                            --with-newlib \
                                            --enable-shared \
                                            --enable-languages=c,c++ \
                                            --enable-default-pie \
                                            ${TRY_USE_LOCAL_TOOLCHAIN:+"--quiet"} || exit 1

        echo "XXX build gcc and libgcc"
        "$MAKE" -j "$MAKEJOBS" all-gcc all-target-libgcc || exit 1
        echo "XXX install gcc and libgcc"
        "$MAKE" install-gcc install-target-libgcc || exit 1

        echo "XXX serenity libc and libm headers"
        mkdir -p "$BUILD"
        pushd "$BUILD"
            mkdir -p Root/usr/include/
            SRC_ROOT=$(realpath "$DIR"/..)
            FILES=$(find "$SRC_ROOT"/Userland/Libraries/LibC "$SRC_ROOT"/Userland/Libraries/LibM -name '*.h' -print)
            for header in $FILES; do
                target=$(echo "$header" | sed -e "s@$SRC_ROOT/Userland/Libraries/LibC@@" -e "s@$SRC_ROOT/Userland/Libraries/LibM@@")
                $INSTALL -D "$header" "Root/usr/include/$target"
            done
            unset SRC_ROOT
        popd

        echo "XXX build libstdc++"
        "$MAKE" -j "$MAKEJOBS" all-target-libstdc++-v3 || exit 1
        echo "XXX install libstdc++"
        "$MAKE" install-target-libstdc++-v3 || exit 1

        if [ "$(uname -s)" = "OpenBSD" ]; then
            cd "$DIR/Local/libexec/gcc/$TARGET/$GCC_VERSION" && ln -sf liblto_plugin.so.0.0 liblto_plugin.so
        fi

    popd
popd


# == SAVE TO CACHE ==

pushd "$DIR"
    if [ "${TRY_USE_LOCAL_TOOLCHAIN}" = "y" ] ; then
        echo "::endgroup::"
        echo "Building cache tar:"

        rm -f "${CACHED_TOOLCHAIN_ARCHIVE}"  # Just in case

        # Stripping doesn't seem to work on macOS.
        # However, this doesn't seem to be necessary on macOS, the uncompressed size is already about 210 MiB.
        if [ "$(uname)" != "Darwin" ]; then
            # We *most definitely* don't need debug symbols in the linker/compiler.
            # This cuts the uncompressed size from 1.2 GiB per Toolchain down to about 190 MiB.
            echo "Stripping executables ..."
            echo "Before: $(du -sh Local)"
            find Local/ -type f -executable ! -name '*.la' ! -name '*.sh' ! -name 'mk*' -exec strip {} +
            echo "After: $(du -sh Local)"
        fi
        tar czf "${CACHED_TOOLCHAIN_ARCHIVE}" Local/

        echo "Cache (after):"
        ls -l Cache
    fi
popd