EXEDIR="$(dirname "$0")"
EXEDIR="$(cd "$EXEDIR"; pwd)"

TOOLCHAINS="$EXEDIR/toolchain"
DEPS="$EXEDIR/deps"
STAGE="$EXEDIR/staging"
MINSIZE="-Oz -flto=auto -ffunction-sections -fdata-sections"
LDMINSIZE="-Wl,--gc-sections -flto=auto"
CFLAGS=""
LDFLAGS="-lgcc_eh"
HOSTCC=cc
LUA_VER="5.5"
LUA_RELEASE="5.5.0"
LUAJIT_VER="2.1"
LUAJIT_RELEASE="2.1-20250826"
LUAJIT_LUAVER="5.1"
nproc=$(nproc)

TARGETS="\
aarch64-unknown-linux-musl \
arm-unknown-linux-musleabi \
i586-unknown-linux-musl \
x86_64-unknown-linux-musl \
mips-unknown-linux-muslsf \
mips64-unknown-linux-musl \
mips64el-unknown-linux-musl \
mipsel-unknown-linux-muslsf \
powerpc-unknown-linux-musl \
riscv64-unknown-linux-musl \
"

target_has_luajit()
{
	case "$1" in
		aarch64-unknown-linux-musl| \
		arm-unknown-linux-musleabi| \
		x86_64-unknown-linux-musl| \
		mips-unknown-linux-muslsf| \
		mips64-unknown-linux-musl| \
		mips64el-unknown-linux-musl| \
		mipsel-unknown-linux-muslsf| \
		powerpc-unknown-linux-musl) \
			return 0
			;;
	esac
	return 1
}

bsd_files()
{
	install -Dm644 -t $STAGING_DIR/include/sys /usr/include/x86_64-linux-gnu/sys/queue.h /usr/include/sys/capability.h
}

buildenv()
{
	# $1 = arch

	export TARGET=$1
	export CC=$TARGET-gcc
	export LD=$TARGET-ld
	export AR=$TARGET-ar
	export NM=$TARGET-nm
	export STRIP=$TARGET-strip
	export STAGING_DIR="$EXEDIR/staging/$TARGET"
	[ -d "$STAGING_DIR" ] || {
		mkdir -p "$STAGING_DIR"
		mkdir -p "$STAGING_DIR/lib/pkgconfig"
		mkdir -p "$STAGING_DIR/bin"
		mkdir -p "$STAGING_DIR/include"
	}
	export PKG_CONFIG_PATH=$STAGING_DIR/lib/pkgconfig
	OLDPATH="$PATH"
	export PATH="$PATH:$TOOLCHAINS/$TARGET/bin"
}
buildenv_clear()
{
	export PATH="$OLDPATH" TARGET= CC= LD= AR= NM= STRIP= STAGING_DIR= PKG_CONFIG_PATH=
	OLDPATH=
}


dir_is_not_empty()
{
	# $1 - directory
	local n
	[ -d "$1" ] || return 1
	n=$(ls -A "$1" | wc -c | xargs)
	[ "$n" != 0 ]
}

find_str_in_list()
{
	# $1 - string
	# $2 - space separated values
	local v
	[ -n "$1" ] && {
		for v in $2; do
			[ "$v" = "$1" ] && return 0
		done
	}
	return 1
}

ask_list()
{
	# $1 - mode var
	# $2 - space separated value list
	# $3 - (optional) default value
	local M_DEFAULT
	eval M_DEFAULT="\$$1"
	local M_DEFAULT_VAR="$M_DEFAULT"
	local M="" m

	[ -n "$3" ] && { find_str_in_list "$M_DEFAULT" "$2" || M_DEFAULT="$3" ;}

	n=1
	for m in $2; do
		echo $n : $m
		n=$(($n+1))
	done
	printf "your choice (default : $M_DEFAULT) : "
	read m
	[ -n "$m" ] && M=$(echo $2 | cut -d ' ' -f$m 2>/dev/null)
	[ -z "$M" ] && M="$M_DEFAULT"
	echo selected : $M
	eval $1="\"$M\""

	[ "$M" != "$M_DEFAULT_VAR" ]
}

ask_target()
{
	# $1 = 1 = ask all, otherwise ask only present toolchains

	# already set ?
	[ -n "$TGT" ] && return

	local d ALL_TARGETS
	[ "$1" = 1 ] || {
		if dir_is_not_empty "$TOOLCHAINS"; then
			for d in "$TOOLCHAINS"/*; do
				[ -d "$d" ] && {
					d="$(basename "$d")"
					ALL_TARGETS="$ALL_TARGETS $d"
				}
			done
		fi
	}
	[ -n "$ALL_TARGETS" ] || ALL_TARGETS="$TARGETS"

	echo "select target :"
	ask_list TARGET "ALL $ALL_TARGETS" "ALL"
	echo
	echo selected TARGET : $TARGET
	echo

	if [ $TARGET = ALL ]; then
		TGT="$ALL_TARGETS"
	else
		TGT="$TARGET"
	fi
}

check_toolchains()
{
	dir_is_not_empty "$TOOLCHAINS" || {
		echo DOWNLOAD TOOLCHAINS FIRST
		exit 1
	}
}