# Gales Bitcoin Wallet: GPG integration
# J. Welsh, March 2020

gbw-init () {
	if [ -n "$GBW_DIR" ]; then
		echo 'gbw-init: already opened (GBW_DIR set)'
		return 1
	fi

	if [ -z "$1" ]; then
		echo 'gbw-init: missing filename for encrypted archive'
		return 1
	fi

	GBW_DIR=`mktemp -d -p "$GBW_TMPDIR"` || return
	GBW_FILENAME="$1"
	GBW_OLDPWD="$PWD"

	printf 'Entering GBW_DIR %s\n' "$GBW_DIR"
	cd "$GBW_DIR"
	mkdir -p wallet/keys
	cd wallet

	printf 'Transaction fee to pay, in BTC/kB : '
	read GBW_FEE
	printf '%s\n' "$GBW_FEE" > fee
	unset GBW_FEE

	echo 'Generating change address...'
	gbw-signer gen-key > change
}

gbw-open () {
	if [ -n "$GBW_DIR" ]; then
		echo 'gbw-open: already opened (GBW_DIR set)'
		return 1
	fi

	if [ -z "$1" ]; then
		echo 'gbw-open: missing filename'
		return 1
	fi

	if ! [ -e "$1" ]; then
		printf 'gbw-open: not found: %s\n' "$1"
		return 1
	fi

	GBW_DIR=`mktemp -d -p "$GBW_TMPDIR"` || return
	GBW_FILENAME="$1"
	GBW_OLDPWD="$PWD"

	gpg --decrypt "$1" | tar -xf - -C "$GBW_DIR"

	printf 'Entering GBW_DIR %s\n' "$GBW_DIR"
	cd "$GBW_DIR/wallet"
}

gbw-save () {
	if [ -z "$GBW_DIR" ]; then
		echo 'gbw-save: not opened (GBW_DIR unset)'
		return 1
	fi

	(cd "$GBW_OLDPWD" &&
	tar -cf - -C "$GBW_DIR" wallet | gpg --encrypt --armor --recipient "$GBW_RECIPIENT" --output "$GBW_FILENAME{new}" &&
	sync &&
	mv -f "$GBW_FILENAME{new}" "$GBW_FILENAME")
}

gbw-discard () {
	if [ -z "$GBW_DIR" ]; then
		echo 'gbw-discard: not opened (GBW_DIR unset)'
		return 1
	fi

	printf 'Returning to %s\n' "$GBW_OLDPWD"
	cd "$GBW_OLDPWD"
	rm -rf "$GBW_DIR"
	unset GBW_OLDPWD GBW_DIR GBW_FILENAME
}

gbw-close () {
	gbw-save && gbw-discard
}