#!/bin/bash
#
# Copyright (c) 2020 Bubble, Inc.  All rights reserved. For personal (non-commercial) use, see license: https://getbubblenow.com/bubble-license/
#
# Build and push a docker image to docker hub, if needed.
# Run by jenkins after a successful build of the main Bubble repository.
#
# If an image has already been pushed with the current version, we do nothing.
# If no image has been pushed with the current version, we build it and push it.
#
# Environment Variables:
#
#    BUBBLE_DOCKER_USER   - dockerhub username for "docker login"
#    BUBBLE_DOCKER_PASS   - dockerhub password for "docker login"
#

function die {
  echo 1>&2 "${1}"
  exit 1
}

function ensure_docker_experimental_enabled() {
  DOCKER_DIR=${HOME}/.docker
  mkdir -p "${DOCKER_DIR}" || die "Error creating ${DOCKER_DIR}"
  if [[ -f ${DOCKER_DIR}/config.json ]] ; then
    TMP_CONFIG=$(mktemp /tmp/config.json.XXXX) &&
    jq '. + {"experimental": "enabled"}' < "${DOCKER_DIR}/config.json" > "${TMP_CONFIG}" &&
    mv "${TMP_CONFIG}" "${DOCKER_DIR}/config.json" || ( rm -f "${TMP_CONFIG}" ; die "Error adding experimental flag to ${DOCKER_DIR}/config.json" )
    if [[ -f ${TMP_CONFIG} ]] ; then rm -f "${TMP_CONFIG}" ; fi
    echo "ensure_docker_experimental_enabled: updated ${DOCKER_DIR}/config.json --> "
    cat "${DOCKER_DIR}/config.json"
  else
    echo '{"experimental": "enabled"}' > ~/.docker/config.json
    echo "ensure_docker_experimental_enabled: created ${DOCKER_DIR}/config.json --> "
    cat "${DOCKER_DIR}/config.json"
  fi
}

if [[ -z "${BUBBLE_DOCKER_USER}" ]] ; then
  die "No BUBBLE_DOCKER_USER env var found"
fi
if [[ -z "${BUBBLE_DOCKER_PASS}" ]] ; then
  die "No BUBBLE_DOCKER_PASS env var found"
fi

set +x

THISDIR="$(cd "$(dirname "${0}")" && pwd)"
BUBBLE_DIR="$(cd "${THISDIR}/../.." && pwd)"

echo "Logging in to docker ..."
echo -n "${BUBBLE_DOCKER_PASS}" | docker login -u "${BUBBLE_DOCKER_USER}" --password-stdin || die "Error logging in to docker"

echo "Determining Bubble version ..."
META_FILE="${BUBBLE_DIR}/bubble-server/src/main/resources/META-INF/bubble/bubble.properties"
VERSION="$(cat "${META_FILE}" | grep bubble.version | awk -F '=' '{print $2}' | awk -F ' ' '{print $NF}' | awk '{$1=$1};1')"
if [[ -z "${VERSION}" ]] ; then
  die "Error determining version from: ${META_FILE}"
fi
echo "Found Bubble version ${VERSION}"

echo "Building docker bubble version ${VERSION} ..."
BUBBLE_DOCKER="${BUBBLE_DIR}/docker/bubble.sh"
${BUBBLE_DOCKER} build || die "Error building docker image"

echo "Checking to see if version ${VERSION} already exists on dockerhub..."
ensure_docker_experimental_enabled
if docker manifest inspect "getbubble/launcher:${VERSION}" > /dev/null 2> /dev/null ; then
  echo "Version ${VERSION} already exists on dockerhub, not re-publishing"
  exit 0
fi

echo "Version ${VERSION} does not exist on dockerhub, pushing it ..."

${BUBBLE_DOCKER} push || die "Error pushing docker image"

echo "Successfully pushed to dockerhub: ${VERSION}"