#!/usr/bin/env bash

#
# Copyright (c) 2020 Project CHIP Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# build.sh   - utility for building (and optionally) tagging and pushing
#               the a Docker image
#
# This script expects to find a Dockerfile next to $0, so symlink
#  in an image name directory is the expected use case.

me=$(basename "$0")
cd "$(dirname "$0")"

ORG=${DOCKER_BUILD_ORG:-connectedhomeip}

# directory name is
IMAGE=${DOCKER_BUILD_IMAGE:-$(basename "$(pwd)")}

# version
VERSION=${DOCKER_BUILD_VERSION:-$(sed 's/ .*//' version)}

[[ ${*/--help//} != "${*}" ]] && {
    set +x
    echo "Usage: $me <OPTIONS>

  Build and (optionally tag as latest, push) a docker image from Dockerfile in CWD

  Options:
   --no-cache passed as a docker build argument
   --latest   update latest to the current built version (\"$VERSION\")
   --push     push image(s) to docker.io (requires docker login for \"$ORG\")
   --help     get this message
   --squash   squash docker layers before push them to docker.io (requires docker-squash python module)

"
    exit 0
}

die() {
    echo "$me: *** ERROR: $*"
    exit 1
}

set -ex

[[ -n $VERSION ]] || die "version cannot be empty"

mb_space_before=$(df -m /var/lib/docker/ | awk 'FNR==2{print $3}')

# go find and build any CHIP images this image is "FROM"
awk -F/ '/^FROM connectedhomeip/ {print $2}' Dockerfile | while read -r dep; do
    dep=${dep%:*}
    (cd "../$dep" && ./build.sh "$@")
done

BUILD_ARGS=()
if [[ ${*/--no-cache//} != "${*}" ]]; then
    BUILD_ARGS+=(--no-cache)
fi

docker build "${BUILD_ARGS[@]}" --build-arg VERSION="$VERSION" -t "$ORG/$IMAGE:$VERSION" .
docker image prune --force

[[ ${*/--latest//} != "${*}" ]] && {
    docker tag "$ORG"/"$IMAGE":"$VERSION" "$ORG"/"$IMAGE":latest
}

[[ ${*/--squash//} != "${*}" ]] && {
    command -v docker-squash >/dev/null &&
        docker-squash "$ORG"/"$IMAGE":"$VERSION" -t "$ORG"/"$IMAGE":latest
}

[[ ${*/--push//} != "${*}" ]] && {
    docker push "$ORG"/"$IMAGE":"$VERSION"
    [[ ${*/--latest//} != "${*}" ]] && {
        docker push "$ORG"/"$IMAGE":latest
    }
}

docker images --filter=reference="$ORG/*"
df -h /var/lib/docker/
mb_space_after=$(df -m /var/lib/docker/ | awk 'FNR==2{print $3}')
printf "%'.f MB total used\n" "$((mb_space_before - mb_space_after))"

exit 0