#!/bin/bash

if [[ "$0" != "${BASH_SOURCE[0]}" ]] ; then
    echo >&2 "Don't source this file, execute it instead, eg: ${BASH_SOURCE[0]} --help"
    return 1
fi

usage() {
    cat <<END
Usage: $0 OPTIONS
Initialize StarlingX build environment & (re-)start builder pods

     --nuke       delete minikube cluster and exit

  -R,--restart-minikube
                  restart minikube cluster before starting pods

     --rebuild    build pod images instead of downloading them

END
}

notice() {
    local tty_on tty_off
    if [[ -t 2 ]] ; then
        tty_on=$'\033[1;36m'
        tty_off=$'\033[0m'
    fi
    echo >&2 "${tty_on}$*${tty_off}"
}


PROGNAME=$(basename "$0")
MINIKUBE=minikube
HELM=helm
DOCKER=docker
PYTHON3=python3
DOCKER_PREFIX="starlingx/"
DOCKER_IMAGES="stx-builder stx-pkgbuilder stx-lat-tool stx-aptly"
DOCKER_TAG="master-debian-latest"
DOCKER_TAG_LOCAL="v0.1.0"

BUILD_DOCKER=0
DELETE_MINIKUBE=0
RESTART_MINIKUBE=0
CLEAN_CONFIG=0

minikube_started() {
    docker ps | grep kicbase | grep -q $MINIKUBENAME
}

minikube_exists() {
    local script=$(cat <<'END'
import json,sys
data = json.load (sys.stdin)
for x in data['valid']+data['invalid']:
    if x['Name'] == sys.argv[1]:
        sys.exit(0)
sys.exit(1)
END
)
    $MINIKUBE profile list -l -o json | $PYTHON3 -c "$script" "$MINIKUBENAME"
}

helm_started() {
    helm ls | grep -q stx
}

cmdline_error() {
    if [[ -n "$1" ]] ; then
        echo "error: $1" >&2
    fi
    echo "Type \`$0 --help' for more info." >&2
    exit 1
}

# process command line
temp=$(getopt -o hR --long help,clean,restart-minikube,rebuild,nuke -n "$PROGNAME" -- "$@") || cmdline_error
eval set -- "$temp"
while true ; do
    case "$1" in
        -h|--help)
            usage
            exit 0
            ;;
        -R|--restart-minikube)
            RESTART_MINIKUBE=1
            shift
            ;;
        --clean)
            CLEAN_CONFIG=1
            shift
            ;;
        --rebuild)
            BUILD_DOCKER=1
            shift
            ;;
        --nuke)
            DELETE_MINIKUBE=1
            shift
            ;;
        --)
            shift
            break
            ;;
        -?*)
            cmdline_error
            ;;
        *)
            break
            ;;
    esac
done
[[ "$#" -le 0 ]] || cmdline_error "too many arguments"

# make sure required programs are installed
if ! command -v $MINIKUBE &> /dev/null; then
    echo >&2 "Command $MINIKUBE could not be found."
    echo >&2 "Please install it as https://minikube.sigs.k8s.io/docs/start/"
    echo ""
    exit 1
fi
if ! command -v $HELM &> /dev/null; then
    echo >&2 "Command $HELM could not be found."
    echo >&2 "Please install it as https://helm.sh/"
    echo ""
    exit 1
fi
if ! command -v $DOCKER &> /dev/null; then
    echo >&2 "Command $DOCKER could not be found. Please install it."
    echo >&2 ""
    exit 1
fi

# clean the configuration and configmap data
if [[ $CLEAN_CONFIG -eq 1 ]] ; then
    if helm_started ; then
        notice "Please firstly stop the helm project with 'stx control stop' command."
        notice "Then execute this cleanup operation again."
        exit 1
    fi
    notice "Clean the config file and configmap data for builder|pkgbuilder container."
    # copy a fresh config file
    rm -f stx.conf
    cp stx.conf.sample stx.conf

    rm -f stx/lib/stx/__pycache__/*
    rm -f stx/stx-build-tools-chart/stx-builder/Chart.lock
    rm -f stx/stx-build-tools-chart/stx-builder/charts/*
    rm -f stx/stx-build-tools-chart/stx-builder/configmap/stx-localrc
    rm -f stx/stx-build-tools-chart/stx-builder/dependency_chart/stx-pkgbuilder/configmap/stx-localrc
    exit 0
fi

# import environment
source import-stx  || return 1

# Make sure $STX_BUILD_HOME exists
if [[ ! -d "$STX_BUILD_HOME" ]] ; then
    echo >&2 "The directory $STX_BUILD_HOME doesn't exist, please create it with the command:"
    echo >&2 ""
    echo >&2 "  mkdir -p $STX_BUILD_HOME"
    echo >&2 ""
    echo >&2 "Then execute this script again!"
    exit 1
fi

# Make sure mirror directory exists. If this directory doesn't exist,
# it will be automatically created with root permission.
if [[ ! -d "$STX_BUILD_HOME/mirrors/starlingx" ]] ; then
    mkdir -p $STX_BUILD_HOME/mirrors/starlingx || exit 1
fi

# --nuke: just delete the cluster and exit
if [[ $DELETE_MINIKUBE -eq 1 ]] ; then
    if minikube_exists ; then
        notice "Deleting minikube cluster \`$MINIKUBENAME'"
        $MINIKUBE delete -p "$MINIKUBENAME" || exit 1
    fi
    exit 0
fi

# Stop minikube if necessary
WANT_START_MINIKUBE=0
if [[ $RESTART_MINIKUBE -eq 1 ]] ; then
    if minikube_started ; then
        notice "Stopping minikube cluster \`$MINIKUBENAME'"
        $MINIKUBE stop -p $MINIKUBENAME
        if minikube_started ; then
            echo >&2 "minikube container $MINIKUBENAME exist!"
            echo >&2 "And the command 'minikube -p $MINIKUBENAME stop' failed. The reason may be"
            echo >&2 "the current MINIKUBE_HOME/HOME is not the same as the $MINIKUBENAME"
            echo >&2 "Please change the MINIKUBE_HOME/HOME directory to the previous value"
            echo >&2 "then re-execute this script"
            exit 1
        fi
    fi
    WANT_START_MINIKUBE=1
elif ! minikube_started ; then
    WANT_START_MINIKUBE=1
fi

# Start minikube
if [[ $WANT_START_MINIKUBE -eq 1 ]] ; then
    notice "Starting minikube cluster \`$MINIKUBENAME'"
    $MINIKUBE start --driver=docker -p $MINIKUBENAME \
        --cpus=$MINIKUBECPUS \
        --memory=$MINIKUBEMEMORY \
        --mount=true \
        --mount-string="$STX_BUILD_HOME:/workspace" \
        || exit 1
fi

# Record the project environment variables
echo "The last minikube cluster startup date: `date`" > minikube_history.log
echo "MINIKUBE_HOME: $MINIKUBE_HOME" >> minikube_history.log
echo "MINIKUBENAME: $MINIKUBENAME" >> minikube_history.log
echo "STX_BUILD_HOME: $STX_BUILD_HOME" >> minikube_history.log

# Import minikube's docker environment
eval $(minikube -p $MINIKUBENAME docker-env)

# Build container images
if [[ $BUILD_DOCKER -eq 1 ]] ; then
    notice "Building docker images"
    for img in $DOCKER_IMAGES; do
        docker build --no-cache -t $img:$DOCKER_TAG_LOCAL -f stx/dockerfiles/$img.Dockerfile . || exit 1
    done
# else: download and retag
else
    notice "Pulling docker images"
    for img in $DOCKER_IMAGES; do
        docker pull ${DOCKER_PREFIX}${img}:${DOCKER_TAG} || exit 1
        docker tag ${DOCKER_PREFIX}${img}:${DOCKER_TAG} ${img}:${DOCKER_TAG_LOCAL} || exit 1
    done
fi

# Restart pods
notice "Restarting pods"
stx control stop || exit 1
stx control start || exit 1