#!/usr/bin/env bash
set -e

function headIsDetached() {
    [[ $(git rev-parse --abbrev-ref --symbolic-full-name HEAD) == "HEAD" ]];
}

function dockerImageExists() {
    docker image inspect "${IMAGE}:${COMMIT}" 2>&1 1>/dev/null;
}

function binaryExists() {
    ls -l build/{{ item.targets | first }}_${COMMIT} 2>&1 1>/dev/null
}

function fetchChanges() {
    # We cannot use "git pull" in here, because history may be changed upstream
    git fetch
    git reset --hard "origin/${BRANCH}"
}

function buildBinaries() {
    # Lower CPU and I/O priority so it doesn't affect the running beacon node
    NICE="nice -n 19 ionice -c2 -n7"

    ${NICE} make -j1 update
    ${NICE} make -j1 {{ item.targets | join(" ") }} \
        LOG_LEVEL="TRACE" NIMFLAGS="-d:testnet_servers_image -d:noSignalHandler"

    # Rename binaries to match commit the were built from.
{% for target in item.targets %}
    mv "build/{{ target }}" "build/{{ target }}_${COMMIT}"
{% endfor %}

    # Delete copies that are older than 7 days
    find build -mtime +7 -exec rm '{}' \+
}

# Adds binary into a simple Alpine image
function buildDockerImage() {
    docker build -t "${IMAGE}:${COMMIT}" \
        --build-arg=COMMIT=${COMMIT} \
        --label "commit=${COMMIT}" .
}

function pushImageTag() {
    docker tag "${IMAGE}:${COMMIT}" "${IMAGE}:${TAG}"
    docker push "${IMAGE}:${TAG}"
}

#-------------------------------------------------------------------------------

BRANCH="{{ item.version }}"
IMAGE="{{ beacon_node_builds_image_name }}"
TAG="{{ item.name }}"

if [[ "${USER}" != "{{ beacon_node_builds_user }}" ]]; then
    echo "Incorrect user: ${USER}" >&2
    echo "Expected: {{ beacon_node_builds_user }}" >&2
    exit 1
fi

# Build the Beacon node binaries
pushd repo >/dev/null

# Detached HEAD means we're probably on a tag
if headIsDetached; then
    echo " >>> Deatached HEAD, nothing to fetch."
else
    echo " >>> Fetching changes..."
    fetchChanges
fi

COMMIT=$(git rev-parse --short=8 HEAD)

if binaryExists && [[ "$1" != "--force" ]]; then
    echo " >>> Binary already built"
else
    echo " >>> Building binaries..."
    buildBinaries
fi

popd >/dev/null

if dockerImageExists && [[ "$1" != "--force" ]]; then
    echo " >>> Image already built: ${IMAGE}:${COMMIT}"
else
    echo " >>> Building Docker image..."
    buildDockerImage
fi

echo " >>> Pushing Docker image..."
pushImageTag

echo " >>> SUCCESS - Pushed: ${IMAGE}:${TAG}"