#!/bin/bash

if [ "_$BRANCH" == "_" ]; then
	echo "Please specify BRANCH environment variable." >&2
	exit 1
fi

if [ "_$BASE" == "_" ]; then
	echo "Please specify BASE environment variable (Gluon, i.e. 'v2014.3' or commit-id)." >&2
	exit 1
fi

if [ "_$VERSION" == "_" -a "$BRANCH" != "experimental" ]; then
	echo "Please specify VERSION environment variable (not necessary for experimental branch)." >&2
	exit 1
fi

MY_DIR=$(dirname $0)
MY_DIR=$(readlink -f "$MY_DIR")
CODE_DIR="src"
pushd $MY_DIR > /dev/null

. functions.sh

if [ ! -d "$CODE_DIR" ]; then
	info "Code directory does not exist yet - fetching Gluon ..."
	git clone https://github.com/freifunk-gluon/gluon.git "$CODE_DIR"
fi

if [ ! -d "$CODE_DIR/site" ]; then
        info "Site repository does not exist, fetching it ..."
	git clone https://git.c3pb.de/freifunk-pb/site-ffpb.git "$CODE_DIR/site"
fi

### CHECKOUT GLUON
progress "Checking out GLUON '$BASE' ..."
cd $CODE_DIR
# TODO: check if gluon got modified and bail out if necessary
git fetch ; git checkout -q $BASE
[ "$?" -eq "0" ] || abort "Failed to checkout '$BASE' gluon base version, mimimi." >&2
GLUON_COMMIT=$(git rev-list --max-count=1 HEAD)

### CHECKOUT SITE REPO
progress "Pulling SITE REPO for '$BRANCH' ..."
cd site
# TODO: check if site got modified locally and bail out if necessary
git checkout -q $BRANCH ; git pull
[ "$?" -eq "0" ] || abort "Failed to checkout '$BRANCH' branch in site repository, mimimi."
SITE_COMMIT=$(git rev-list --max-count=1 HEAD)

cd ..

### CLEAN
if [ "$BRANCH" != "experimental" ]; then
	progress "Cleaning your build environment ..."
	make clean
fi

### PREPARE
progress "Preparing the build environment (make update) ..."
make update
[ "$?" -eq "0" ] || abort "Failed to update the build environment, mimimi."

### BUILD TOOLCHAIN
progress "Building toolchain if necessary (this is not possible on a fresh build) ..."
make toolchain -j 1

### BUILD FIRMWARE
progress "Building the firmware - please stand by!"
if [ "$BRANCH" != "experimental" ]; then
	GLUON_BRANCH=$BRANCH GLUON_RELEASE=$VERSION make
else
	GLUON_BRANCH=experimental make -j 4
fi

[ "$?" -eq "0" ] || abort "Failed to build the firmware, mimimi."

cd ..

# write build info
progress "Writing build info ..."
mkdir -p "output/${BRANCH}"
echo -en "" > "output/${BRANCH}/build_info.txt"
echo "VERSION=${VERSION}" >> "output/${BRANCH}/build_info.txt"
echo "GLUON=${GLUON_COMMIT} # ${BASE}" >> "output/${BRANCH}/build_info.txt"
echo "SITE=${SITE_COMMIT} # ${VERSION}" >> "output/${BRANCH}/build_info.txt"

# compress all binaries into 7z archive
progress "Assembling images.7z ..."
[ -e "output/${BRANCH}/images.7z" ] && rm "output/${BRANCH}/images.7z"
7z a "output/${BRANCH}/images.7z" ${CODE_DIR}/images/sysupgrade/*.bin ${CODE_DIR}/images/factory/*.bin || abort "Failed to assemble images (did you install p7zip-full?)."

# generate and copy manifest
progress "Generating and copying manifest ..."
make manifest || abort "Failed to generate the manifest, try running 'make manifest' in '$CODE_DIR' directory manually."
cp "${CODE_DIR}/images/sysupgrade/${BRANCH}.manifest" "output/${BRANCH}/"

success "We're done, go and checkout your new firmware in output/${BRANCH}!"

popd > /dev/null