#! /bin/sh

set -ex

srcdir="$(dirname "$0")"
test -z "$srcdir" && srcdir=.

: "${AUTORECONF:=autoreconf}"
: "${AUTOMAKE:=automake}"

cd "$srcdir"

FREESTANDING_TOOLCHAIN_COMMIT_HASH=18a5e52483344e117d45738c9afb2b34792cbced
FREESTANDING_HEADERS_COMMIT_HASH=dd3abd2d7147efc4170dff478d3b7730bed14147
CC_RUNTIME_COMMIT_HASH=38942e9a0d11af77c5d9fb45794850f7a1565d2b
LIMINE_EFI_COMMIT_HASH=c6ae0cb1dfaad810a1406b096fa107f83b4d84be
TINF_COMMIT_HASH=57ffa1f1d5e3dde19011b2127bd26d01689b694b
FLANTERM_COMMIT_HASH=347d9cf1e3fced64aa20ab278e2fdcc834086035
STB_COMMIT_HASH=f4a71b13373436a2866c5d68f8f80ac6f0bc1ffe
DTC_COMMIT_HASH=039a99414e778332d8f9c04cbd3072e1dcc62798

AUXFILES="config.guess config.sub install-sh"

clone_repo_commit() {
    if [ -d $2/.git ]; then
        git -C $2 reset --hard
        git -C $2 clean -fd
        if ! git -C $2 checkout $3; then
            rm -rf $2
        fi
    else
        if [ -d $2 ]; then
            echo "error: '$2' is not a Git repository"
            exit 1
        fi
    fi
    if ! [ -d $2 ]; then
        git clone $1 $2
        git -C $2 checkout $3
    fi
}

if ! [ -f version ]; then
    clone_repo_commit https://github.com/mintsuki/freestanding-toolchain.git build-aux/freestanding-toolchain $FREESTANDING_TOOLCHAIN_COMMIT_HASH
    clone_repo_commit https://github.com/mintsuki/freestanding-headers.git freestanding-headers $FREESTANDING_HEADERS_COMMIT_HASH

    clone_repo_commit https://github.com/mintsuki/cc-runtime.git decompressor/cc-runtime $CC_RUNTIME_COMMIT_HASH
    rm -rf common/cc-runtime
    cp -rp decompressor/cc-runtime common/
    for f in common/cc-runtime/*.c; do
        mv "$f" "$(echo "$f" | sed 's/\.c/.s2.c/g')"
    done

    clone_repo_commit https://github.com/limine-bootloader/limine-efi.git limine-efi $LIMINE_EFI_COMMIT_HASH

    clone_repo_commit https://github.com/jibsen/tinf.git tinf $TINF_COMMIT_HASH
    mkdir -p decompressor/tinf
    cp tinf/src/tinf.h tinf/src/tinflate.c tinf/src/tinfgzip.c decompressor/tinf/
    patch -p0 < decompressor/tinf.patch
    rm -f tinf/src/tinf.h.orig tinf/src/tinflate.c.orig tinf/src/tinfgzip.c.orig

    clone_repo_commit https://github.com/mintsuki/flanterm.git common/flanterm $FLANTERM_COMMIT_HASH

    clone_repo_commit https://github.com/nothings/stb.git stb $STB_COMMIT_HASH
    cp stb/stb_image.h common/lib/
    patch -p0 < common/stb_image.patch
    rm -f common/lib/stb_image.h.orig

    clone_repo_commit https://git.kernel.org/pub/scm/utils/dtc/dtc.git dtc $DTC_COMMIT_HASH
    rm -rf common/libfdt
    cp -rp dtc/libfdt common/
    find common/libfdt/ -type f -not -name '*.c' -not -name '*.h' -delete
    patch -p1 < common/libfdt.patch
fi

# Create timestamps file
if git log -1 >/dev/null 2>&1; then
    cat >timestamps <<EOF
REGEN_DATE="$(git log -1 --pretty=%cd --date='format:%B %Y')"
SOURCE_DATE_EPOCH="$(git log -1 --pretty=%ct)"
SOURCE_DATE_EPOCH_TOUCH="$(git log -1 --pretty=%cI | head -c 16 | sed 's/-//g;s/T//g;s/://g')"
EOF
fi

if ! test -f timestamps; then
    echo "error: Not a Git repository and 'timestamps' file missing."
    exit 1
fi

for auxfile in $AUXFILES; do
    rm -f build-aux/$auxfile
done

$AUTORECONF -fvi -Wall

# Older versions of autoreconf have a bug where they do not
# install auxiliary files, sometimes... Check if that is the
# case and work around...
for auxfile in $AUXFILES; do
    if ! [ -f build-aux/$auxfile ]; then
        if ! $AUTOMAKE --print-libdir >/dev/null 2>&1; then
            echo "error: Broken autoreconf detected, but missing or broken automake."
            echo "       Please make sure automake is installed and working."
            exit 1
        fi
        AUTOMAKE_LIBDIR="$($AUTOMAKE --print-libdir)"
        if [ -z "$AUTOMAKE_LIBDIR" ]; then
            # Assume `true` was passed as $AUTOMAKE
            continue
        fi
        mkdir -p build-aux
        cp -v "$AUTOMAKE_LIBDIR/$auxfile" build-aux/
        chmod +x build-aux/$auxfile
    fi
done