#!/bin/sh

: ${UCX_PATH:=$(pwd)/std}
export UCX_PATH

case "$1" in
	(help)
		echo "UniConfX.sh ACTION FILE"
		exit 0
esac

UCX_FILE="$(realpath $2)"

# 0) Prepare work directory
WORKDIR="/tmp/ucx_$$"
mkdir -p "$WORKDIR/execution/usr/share/bin"
cp Xpath "$WORKDIR/execution/usr/share/bin"
export PATH="$PATH:$WORKDIR/execution/usr/share/bin"
cd "$WORKDIR/execution"

# cp -L /bin/sh /usr/bin/env $(command -v find) $(command -v awk) ./bin
# cp -L $(command -v git) $(command -v git-receive-pack) $(command -v git-shell) $(command -v git-upload-archive) $(command -v git-upload-pack) $(command -v git-http-backend) ./bin
# cp -rL /lib /lib64 .
#
# if command -v ldd >/dev/null 2>&1
# then
# 	while read -r f
# 	do
# 		deps="$(ldd "./$f" 2>/dev/null | awk '$3~/\/lib\//{print$3}')"
# 		[ -n "$deps" ] && cp -Lf $deps ./lib
# 		deps="$(ldd "./$f" 2>/dev/null | awk '$3~/\/lib64\//{print$3}')"
# 		[ -n "$deps" ] && cp -Lf $deps ./lib64
# 	done <<LIBS
# $(find . -type f)
# LIBS
# fi
# if command -v patchelf >/dev/null 2>&1
# then
# 	while read -r f
# 	do
# 		chmod +w $f
# 		patchelf --set-interpreter /lib64/ld-linux-x86-64.so.2 "$f" 2>/dev/null || continue
# 		patchelf --set-rpath /lib:/lib64 "$f" 2>/dev/null || continue
# 	done <<LIBS
# $(find ./bin ./lib -type f)
# LIBS
# fi
if command -v mount >/dev/null 2>&1
then
	mkdir bin
	sudo mount --bind /run/current-system/sw/bin ./bin
	mkdir lib
	sudo mount --bind /lib ./lib
	mkdir lib64
	sudo mount --bind /lib64 ./lib64
	mkdir dev
	sudo mount --bind /dev ./dev
fi

cd "$WORKDIR"
echo $WORKDIR

safe_exit() {
	chmod -R +w ./execution/bin
	rm -rf "$WORKDIR"
	exit "$1"
}

REG_NAME='/^[ \t\v]*name[ \t\v]*:=[ \t\v]*/'
REG_IMPORT='/^[ \t\v]*import[ \t\v]*:=[ \t\v]*/'

# 0) Get name
export SELF=$(awk '
	match($0, '"$REG_NAME"') {
		name = substr($0, RSTART + RLENGTH)
	}
	END {
		print name
	}
' "$UCX_FILE")

# 1) Emplace includes
cp "$UCX_FILE" "$SELF.ucx"
until awk '
		BEGIN {
			status = 0
			while ((getline < ARGV[1]) > 0) {
				if (match($0, '"$REG_IMPORT"')) {
					status = 1
					"Xpath " substr($0, RSTART + RLENGTH) | getline imf
					while ((getline < imf) > 0) {
						if ($0 !~ '"$REG_NAME"')
							print
					}
					close(imf)
				}
				else
					print
			}
			close(ARGV[1])
			exit status
		}
	' "$SELF.ucx" > temp.ucx
do
	mv temp.ucx "$SELF.ucx"
done
rm temp.ucx

# 3) Hash
UCX_HASH="$(cksum "$SELF.ucx" | awk '{print$1}')"

case "$1" in
	(hash)
		echo "$UCX_HASH"
		safe_exit 0
		;;
esac

# 3) Split into components
mkdir -p ./execution/sections/
awk '
	/^#-- / {
		section = substr($0, 5)
		if (outf != "")
			close(outf)
		outf = "./execution/sections/" ENVIRON["SELF"] "_" section ".ucxs"
		next
	}
	outf != "" {
		print > outf
	}
' "$SELF.ucx"

# 4) Execute
sudo chroot ./execution /bin/env -i PATH="$PATH:/usr/share/bin" SELF="$SELF" /bin/sh "/sections/${SELF}_do.ucxs" || exit 1
echo $?

# 5) Install

safe_exit 0