#!/bin/sh

set -e

SCRIPT_DIR="$(dirname "$0")"
CUSTOM_DIR="$SCRIPT_DIR/gluon/tmp/custom/"

cd "$SCRIPT_DIR"

BOARD="$(grep -e '^CONFIG_TARGET_BOARD=' .config | cut -d '=' -f 2 | tr -d '"')"
SUBTARGET="$(grep -e '^CONFIG_TARGET_SUBTARGET=' .config | cut -d '=' -f 2 | tr -d '"')"

config2profiles() {
	# Using .profiles.mk is not an option, because we disable a lot of devices
	# in gluon and we do not want them to be built.
	grep -e "^CONFIG_TARGET_DEVICE_${BOARD}_${SUBTARGET}_DEVICE.*=y\$" "$1" | \
		cut -d '=' -f 1 | cut -d '_' -f 7-
}

config2packages() {
	# some CONFIG_PACKAGE_* symbols appear, which are not a package, therefore
	# strip everything that begins with uppercase characters.
	grep -e '^CONFIG_PACKAGE_[[:lower:]].*=y' "$1" | \
		cut -d '_' -f 3- | cut -d '=' -f 1 | \
		tr -s '\n' ' '

	# Per device packages
	if grep -qe '^CONFIG_TARGET_PER_DEVICE_ROOTFS=y$' "$1"; then
		grep -e "^CONFIG_TARGET_DEVICE_PACKAGES_${BOARD}_${SUBTARGET}_DEVICE_$2=" "$1" | \
			cut -d '=' -f 2 | tr -d '"'
	fi

	# Disable default packages (if necessary)
	default_packages="$(
		grep -e '^CONFIG_DEFAULT_[[:lower:]].*=y$' "$1" | \
			sed 's/^CONFIG_DEFAULT_\(.*\)=y$/\1/'
	)"
	for default_package in $default_packages; do
		if ! grep -q "^CONFIG_PACKAGE_${default_package}=y$" "$1"; then
			echo "-${default_package}"
		fi
	done | tr -s '\n' ' '
}

if [ -z "$INCLUDE_ONLY" ] && [ "$#" -lt 1 ]; then
	echo 'This is the gluon imagebuilder. You can use this to build a '
	echo 'customized gluon:'
	echo
	echo '- Note, that we do not fully support the imagebuilder.'
	echo '- Adding additional packages or removing them is not supported.'
	echo '- Adding arbitrary files is not supported.'
	echo '- The imagebuilder is only used to to add a custom config custom.json'
	echo '  with chosen configuration options to gluon. Please refer to'
	echo '  https://gluon.readthedocs.io/ to see the available options.'
	echo '- Place your custom.json in this directory.'
	echo
	echo 'To continue, run this script with'
	echo
	echo "#> $0 PROFILE"
	echo
	echo 'where PROFILE may be one of the following:'
	config2profiles .config | sed 's/^/- /'
	exit 0
fi


if [ -z "$INCLUDE_ONLY" ]; then
	rm -rf "$CUSTOM_DIR"
	mkdir -p "$CUSTOM_DIR/lib/gluon/"
	cp "custom.json" "$CUSTOM_DIR/lib/gluon/"

	if ! config2profiles .config | grep -e "^$1\$"; then
		echo "Profile $1 not available. Call without argument to see available profiles."
		exit 1
	fi

	make -n -C \"$SCRIPT_DIR\" image \
		FILES=\"$CUSTOM_DIR\" PACKAGES=\"$(config2packages .config "$1")\" PROFILE=\"$1\"
fi