#!/usr/bin/env bash
# vim: ft=sh
set -e

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

function binaryExists() {
    ls build/fluffy_${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() {
    # Control number of jobs used to lower impact on running nodes
    export MAKEFLAGS="-j{{ nimbus_fluffy_build_jobs | int }}"

    make update OVERRIDE=1
    make fluffy \
        LOG_LEVEL="{{ nimbus_fluffy_build_log_level }}" \
        NIMFLAGS="{{ nimbus_fluffy_build_nim_flags | join(' ') }}"

    # Rename binaries to match commit they were built from.
    mv "build/fluffy" "build/fluffy_${COMMIT}"

    # Create a symbolic link to the latest version
    ln -frs build/fluffy_${COMMIT} build/fluffy

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

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

BRANCH="{{ nimbus_fluffy_repo_branch }}"
SERVICE="{{ nimbus_fluffy_build_restart_service }}"

echo " >>> Build Start: $(date -u +"%Y-%m-%dT%H:%M:%SZ")"

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

# 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"
    exit 0
else
    echo " >>> Building binaries..."
    buildBinaries
fi

{% if nimbus_fluffy_build_restarts_service %}
# Avoid faiure on first Ansible run due to missing service.
if [[ $(systemctl is-active "${SERVICE}" || true) == "inactive" ]]; then
    echo " !!! No service to restart!"
    exit
else
    echo " >>> Restarting service..."
    sudo systemctl restart "${SERVICE}"
fi

{% endif %}
echo " >>> SUCCESS"