#!/bin/bash

echo -e "\n==> EXECUTING @$(date -u +'%Y-%m-%d_%H-%M-%S'): ${0} $@\n"

declare _mydir=$(dirname $0)
source "${_mydir}"/env.rc
source "${_mydir}"/util.rc

main() {
    local params=$@
    local helper_suffix="_helper"
    local now
    local version_sticker
    local -i exit_code=0

    local should_build=${FORCE_BUILDING}
    local build_prohibited=${PROHIBIT_BUILDING}
    local cache_script="cache"

    ### refresh local cache
    "${_mydir}/${cache_script}" "${_branch}" "${_blend}"
    exit_code=$?
    if [[ ${exit_code} -ne 0 ]] ; then die "Script '${cache_script}' failed with code ${exit_code}." ${exit_code} ; fi

    ### debugging support
    # dump_environment

    echo -e "\nRemoving helper files\n"
    cleanup_scrap_files

    ### check for the '--target' parameter
    if [[ $# -gt 0 ]] ; then

        ### no quotes around 'params'
        for i in ${params} ; do
            if [[ "${i}" == "--target" ]] ; then

                target_stage="${i}"

            elif [[ -n "${target_stage}" ]] ; then

                ### only if '--target' is followed by a value
                if [[ ! "${i}" =~ ^- ]] ; then

                    ### remove the '--target' with its value
                    params="${params/--target ${i}/}"
                fi
                break
            fi
        done

        ### remove the orphaned '--target' (missing value)
        if [[ "${target_stage}" == "--target" ]] ; then
            params="${params/--target/}"
            target_stage=""
        fi
    fi

    ### build a temporary helper image for getting the current version sticker values
    set -x
    ### no quotes around 'params'
    docker build ${params} \
        -f "${DOCKERFILE_PATH}" \
            --build-arg BASEIMAGE="${BASEIMAGE}" \
            --build-arg BASETAG="${BASETAG}" \
            \
            ${FEATURES_BUILD_SLIM:+--build-arg ARG_APT_NO_RECOMMENDS=1} \
            ${FEATURES_SCREENSHOOTING:+--build-arg ARG_FEATURES_SCREENSHOOTING=1} \
            ${FEATURES_THUMBNAILING:+--build-arg ARG_FEATURES_THUMBNAILING=1} \
            \
            ${FEATURES_VNC:+--build-arg ARG_TIGERVNC_DISTRO=${TIGERVNC_DISTRO}} \
            ${FEATURES_VNC:+--build-arg ARG_TIGERVNC_VERSION=${TIGERVNC_VERSION}} \
            \
            ${FEATURES_NOVNC:+--build-arg ARG_NOVNC_VERSION=${NOVNC_VERSION}} \
            ${FEATURES_NOVNC:+--build-arg ARG_WEBSOCKIFY_VERSION=${WEBSOCKIFY_VERSION}} \
            ${FEATURES_NOVNC:+--build-arg ARG_MERGE_STAGE_VNC_BASE="stage_novnc"} \
            \
            ${FEATURES_CHROMIUM:+--build-arg ARG_MERGE_STAGE_BROWSER_BASE="stage_chromium"} \
            \
            ${FEATURES_FIREFOX:+--build-arg ARG_MERGE_STAGE_BROWSER_BASE="stage_firefox"} \
            ${FEATURES_FIREFOX_PLUS:+--build-arg ARG_MERGE_STAGE_BROWSER_BASE="stage_firefox_plus"} \
            \
        -t "${DOCKER_REPO}":"${DOCKER_TAG}${helper_suffix}" "${_build_context}"
    set +x

    ### get the actual verbose version sticker value from the helper image and store it as the current one
    ### note that some apps require display to report their versions correctly (e.g. Ristretto or Screenshooter)
    # version_sticker="$( docker run --rm ${DOCKER_REPO}:${DOCKER_TAG}${helper_suffix} --skip-vnc --version-sticker-verbose )"
    version_sticker="$( docker run --rm ${DOCKER_REPO}:${DOCKER_TAG}${helper_suffix} --version-sticker-verbose )"
    echo "${version_sticker}" > "${_build_context}/${_scrap_version_sticker_verbose_current}"
    echo -e "Current verbose version sticker:\n$( cat ${_build_context}/${_scrap_version_sticker_verbose_current} )"

    if [[ "${should_build}" == "1" ]] ; then

        echo ; echo "Building of new image has been forced."
    else
        echo; echo "Building of new image has not been forced."

        echo "Getting the previous verbose version sticker value from the builder gist '${GIST_ID}'"
        if [[ -n "${GIST_ID}" ]] ; then

            get_gist_file "${GIST_ID}" "${DOCKER_REPO}" "${DOCKER_TAG}" "version-sticker-verbose.txt" "${_build_context}/${_scrap_version_sticker_verbose_previous}"
        else
            ### create an empty file instead
            echo -n "" > "${_build_context}/${_scrap_version_sticker_verbose_previous}"
        fi

        echo "Comparing verbose version stickers"
        if cmp -s "${_build_context}/${_scrap_version_sticker_verbose_current}" "${_build_context}/${_scrap_version_sticker_verbose_previous}" ; then

            ### verbose version sticker hasn't changed since the last build - stop building
            echo "Verbose version sticker has not changed since the last build, no need for building a new image." ; echo

            ### if this file is present, the building will not continue
            echo "Demanding building stop"
            touch "${_build_context}/${_scrap_demand_stop_building}"
        else
            ### verbose version sticker has changed since the last build - a new image should be built
            echo "Verbose version sticker has changed, a new image should be built."
            should_build="1"
        fi
    fi

    ### get also the actual short version sticker value from the helper image and store it as the current one
    ### note that some apps require display to report their versions correctly (e.g. Ristretto or Screenshooter)
    # version_sticker="$( docker run --rm ${DOCKER_REPO}:${DOCKER_TAG}${helper_suffix} --skip-vnc --version-sticker )"
    version_sticker="$( docker run --rm ${DOCKER_REPO}:${DOCKER_TAG}${helper_suffix} --version-sticker )"

    ### save the current short version sticker in any case
    ### this allows to delete the blocking file manually and continue building
    ### metadata label value 'any.accetto.version-sticker' is filled from this file
    echo -n "${VERSION_STICKER_PREFIX}${version_sticker}${VERSION_STICKER_SUFFIX}" > "${_build_context}/${_scrap_version_sticker_current}"

    ### building prohibitdd by environment variable
    ### useful for testing the autobuilding on DockerHub before release
    if [[ "${should_build}" == "1" && "${build_prohibited}" == "1" ]] ; then
        ### if this file is present, the building will not continue
        echo "Building has been prohibited. Demanding building stop"
        echo
        touch "${_build_context}/${_scrap_demand_stop_building}"
    fi

    ### display the actual short version sticker
    echo "Current version sticker of '${DOCKER_REPO}:${DOCKER_TAG}${helper_suffix}': ${VERSION_STICKER_PREFIX}${version_sticker}${VERSION_STICKER_SUFFIX}"

    ### delete the helper image in any case
    echo; echo "Removing helper image"
    docker rmi "${DOCKER_REPO}":"${DOCKER_TAG}${helper_suffix}"
}

main $@

echo -e "\n==> FINISHED  @$(date -u +'%Y-%m-%d_%H-%M-%S'): ${0} $@\n"