#!/bin/bash
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#

function usage(){
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo -e "usage: $0 [OPTIONS]"
    echo -e "Install OSM"
    echo -e "  OPTIONS"
    echo -e "     -h / --help:    print this help"
    echo -e "     -y:             do not prompt for confirmation, assumes yes"
    echo -e "     -r <repo>:      use specified repository name for osm packages"
    echo -e "     -R <release>:   use specified release for osm binaries (deb packages, ...)"
    echo -e "     -u <repo base>: use specified repository url for osm packages"
    echo -e "     -k <repo key>:  use specified repository public key url"
    echo -e "     -a <apt proxy url>: use this apt proxy url when downloading apt packages (air-gapped installation)"
    echo -e "     -c <kubernetes engine>: use a specific kubernetes engine (options: kubeadm, k3s), default is kubeadm"
    echo -e "     -t <docker tag> specify osm docker tag (default is latest)"
    echo -e "     -M <KUBECONFIG_FILE>: Kubeconfig of an existing cluster to be used as mgmt cluster instead of OSM cluster"
    echo -e "     -G <KUBECONFIG_FILE>: Kubeconfig of an existing cluster to be used as auxiliary cluster instead of OSM cluster"
    echo -e "     --no-mgmt-cluster: Do not provision a mgmt cluster for cloud-native gitops operations in OSM (NEW in Release SIXTEEN) (by default, it is installed)"
    echo -e "     --no-aux-cluster: Do not provision an auxiliary cluster for cloud-native gitops operations in OSM (NEW in Release SIXTEEN) (by default, it is installed)"
    echo -e "     -D <devops path>:   use local devops installation path"
    echo -e "     -s <namespace>  namespace when installed using k8s, default is osm"
    echo -e "     -w <work dir>:   Location to store runtime installation"
    echo -e "     -K:             Specifies the name of the controller to use - The controller must be already bootstrapped"
    echo -e "     -d <docker registry URL> use docker registry URL instead of dockerhub"
    echo -e "     -p <docker proxy URL> set docker proxy URL as part of docker CE configuration"
    echo -e "     -T <docker tag> specify docker tag for the modules specified with option -m"
    echo -e "     --debug:        debug mode"
    echo -e "     --nodocker:     do not install docker, do not initialize a swarm (assumes docker is already installed and a swarm has been initialized)"
    echo -e "     --nohostclient: do not install the osmclient"
    echo -e "     --uninstall:    uninstall OSM: remove the containers and delete NAT rules"
    echo -e "     --k8s_monitor:  install the OSM kubernetes monitoring with prometheus and grafana"
    echo -e "     --showopts:     print chosen options and exit (only for debugging)"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function generate_secret() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    head /dev/urandom | tr -dc A-Za-z0-9 | head -c 32
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function check_packages() {
    NEEDED_PACKAGES="$1"
    echo -e "Checking required packages: ${NEEDED_PACKAGES}"
    for PACKAGE in ${NEEDED_PACKAGES} ; do
        dpkg -L ${PACKAGE}
        if [ $? -ne 0 ]; then
            echo -e "Package ${PACKAGE} is not installed."
            echo -e "Updating apt-cache ..."
            sudo apt-get update
            echo -e "Installing ${PACKAGE} ..."
            sudo apt-get install -y ${PACKAGE} || FATAL "failed to install ${PACKAGE}"
        fi
    done
    echo -e "Required packages are present: ${NEEDED_PACKAGES}"
}

function ask_user(){
    # ask to the user and parse a response among 'y', 'yes', 'n' or 'no'. Case insensitive
    # Params: $1 text to ask;   $2 Action by default, can be 'y' for yes, 'n' for no, other or empty for not allowed
    # Return: true(0) if user type 'yes'; false (1) if user type 'no'
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    read -e -p "$1" USER_CONFIRMATION
    while true ; do
        [ -z "$USER_CONFIRMATION" ] && [ "$2" == 'y' ] && return 0
        [ -z "$USER_CONFIRMATION" ] && [ "$2" == 'n' ] && return 1
        [ "${USER_CONFIRMATION,,}" == "yes" ] || [ "${USER_CONFIRMATION,,}" == "y" ] && return 0
        [ "${USER_CONFIRMATION,,}" == "no" ]  || [ "${USER_CONFIRMATION,,}" == "n" ] && return 1
        read -e -p "Please type 'yes' or 'no': " USER_CONFIRMATION
    done
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function install_osmclient(){
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    CLIENT_RELEASE=${RELEASE#"-R "}
    CLIENT_REPOSITORY_KEY="OSM%20ETSI%20Release%20Key.gpg"
    CLIENT_REPOSITORY=${REPOSITORY#"-r "}
    CLIENT_REPOSITORY_BASE=${REPOSITORY_BASE#"-u "}
    key_location=$CLIENT_REPOSITORY_BASE/$CLIENT_RELEASE/$CLIENT_REPOSITORY_KEY
    curl $key_location | sudo APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1 apt-key add -
    sudo add-apt-repository -y "deb [arch=amd64] $CLIENT_REPOSITORY_BASE/$CLIENT_RELEASE $CLIENT_REPOSITORY osmclient IM"
    sudo apt-get -y update
    sudo DEBIAN_FRONTEND=noninteractive apt-get install -y python3-pip
    sudo -H LC_ALL=C python3 -m pip install -U pip
    sudo DEBIAN_FRONTEND=noninteractive apt-get install -y python3-osm-im python3-osmclient
    if [ -f /usr/lib/python3/dist-packages/osm_im/requirements.txt ]; then
        python3 -m pip install -r /usr/lib/python3/dist-packages/osm_im/requirements.txt
    fi
    if [ -f /usr/lib/python3/dist-packages/osmclient/requirements.txt ]; then
        sudo DEBIAN_FRONTEND=noninteractive apt-get install -y libmagic1
        python3 -m pip install -r /usr/lib/python3/dist-packages/osmclient/requirements.txt
    fi
    echo -e "\nOSM client installed"
    echo "You can get the OSM NBI endpoint using the following command"
    echo '     kubectl -n osm get ingress nbi-ingress -o jsonpath="{.spec.rules[0].host}"'
    echo "You will have to configure this env variable in your .bashrc file:"
    echo "     export OSM_HOSTNAME=nbi.${OSM_K8S_EXTERNAL_IP}.nip.io"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
    return 0
}

function docker_login() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "Docker login"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG "Docker registry user: ${DOCKER_REGISTRY_USER}"
    sg docker -c "docker login -u ${DOCKER_REGISTRY_USER} -p ${DOCKER_REGISTRY_PASSWORD} --password-stdin"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

#deploys osm pods and services
function deploy_osm_helm_chart() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    # Generate helm values to be passed with -f osm-values.yaml
    sudo mkdir -p ${OSM_HELM_WORK_DIR}

    # Generate helm values to be passed with --set
    OSM_HELM_OPTS=""
    # OSM_HELM_OPTS="${OSM_HELM_OPTS} --set nbi.useOsmSecret=false"

    OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.image.repositoryBase=${DOCKER_REGISTRY_URL}${DOCKER_USER}"
    [ ! "$OSM_DOCKER_TAG" == "testing-daily" ] && OSM_HELM_OPTS="${OSM_HELM_OPTS} --set-string global.image.tag=${OSM_DOCKER_TAG}"
    [ ! "$OSM_DOCKER_TAG" == "testing-daily" ] && OSM_HELM_OPTS="${OSM_HELM_OPTS} --set prometheus.server.sidecarContainers.prometheus-config-sidecar.image=${DOCKER_REGISTRY_URL}${DOCKER_USER}/prometheus:${OSM_DOCKER_TAG}"

    OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.hostname=${OSM_K8S_EXTERNAL_IP}.nip.io"
    OSM_HELM_OPTS="${OSM_HELM_OPTS} --set grafana.ingress.hosts={grafana.${OSM_K8S_EXTERNAL_IP}.nip.io}"
    OSM_HELM_OPTS="${OSM_HELM_OPTS} --set prometheus.server.ingress.hosts={prometheus.${OSM_K8S_EXTERNAL_IP}.nip.io}"
    # OSM_HELM_OPTS="${OSM_HELM_OPTS} --set prometheus.alertmanager.ingress.hosts={alertmanager.${OSM_K8S_EXTERNAL_IP}.nip.io}"
    if [ -z "${INSTALL_MGMT_CLUSTER}" ]; then
        OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.gitops.enabled=false"
    else
        source "${HOME}/.osm/.credentials/gitea_environment.rc"
        OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.gitops.gitBaseUrl=${GITEA_HTTP_URL}"
        OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.gitops.gitUser=${GITEA_STD_USERNAME}"
        AGE_MGMT_PUBKEY=$(tr -d '\n' < ${HOME}/.osm/.credentials/age.mgmt.pub)
        OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.gitops.pubkey=${AGE_MGMT_PUBKEY}"
    fi

    if [ -n "${OSM_BEHIND_PROXY}" ]; then
        OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.behindHttpProxy=true"
        [ -n "${HTTP_PROXY}" ] && OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.httpProxy.HTTP_PROXY=\"${HTTP_PROXY}\""
        [ -n "${HTTPS_PROXY}" ] && OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.httpProxy.HTTPS_PROXY=\"${HTTPS_PROXY}\""
        if [ -n "${NO_PROXY}" ]; then
            if [[ ! "${NO_PROXY}" =~ .*".svc".* ]]; then
                NO_PROXY="${NO_PROXY},.svc"
            fi
            if [[ ! "${NO_PROXY}" =~ .*".cluster.local".* ]]; then
                NO_PROXY="${NO_PROXY},.cluster.local"
            fi
            OSM_HELM_OPTS="${OSM_HELM_OPTS} --set global.httpProxy.NO_PROXY=\"${NO_PROXY//,/\,}\""
        fi
    fi

    echo "helm upgrade --install -n $OSM_NAMESPACE --create-namespace $OSM_NAMESPACE $OSM_DEVOPS/installers/helm/osm ${OSM_HELM_OPTS}"
    helm upgrade --install -n $OSM_NAMESPACE --create-namespace $OSM_NAMESPACE $OSM_DEVOPS/installers/helm/osm ${OSM_HELM_OPTS}
    # Override existing values.yaml with the final values.yaml used to install OSM
    helm -n $OSM_NAMESPACE get values $OSM_NAMESPACE | sudo tee -a ${OSM_HELM_WORK_DIR}/osm-values.yaml
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function add_local_k8scluster() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    # OSM_HOSTNAME=$(kubectl get --namespace osm -o jsonpath="{.spec.rules[0].host}" ingress nbi-ingress)
    OSM_HOSTNAME="nbi.${OSM_K8S_EXTERNAL_IP}.nip.io:443"
    /usr/bin/osm --hostname ${OSM_HOSTNAME} --all-projects vim-create \
      --name _system-osm-vim \
      --account_type dummy \
      --auth_url http://dummy \
      --user osm --password osm --tenant osm \
      --description "dummy" \
      --config '{management_network_name: mgmt}'
    /usr/bin/osm --hostname ${OSM_HOSTNAME} --all-projects k8scluster-add \
      --creds ${HOME}/.kube/config \
      --vim _system-osm-vim \
      --k8s-nets '{"net1": null}' \
      --version '1.29' \
      --description "OSM Internal Cluster" \
      _system-osm-k8s
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function configure_apt_proxy() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    OSM_APT_PROXY=$1
    OSM_APT_PROXY_FILE="/etc/apt/apt.conf.d/osm-apt"
    echo "Configuring apt proxy in file ${OSM_APT_PROXY_FILE}"
    if [ ! -f ${OSM_APT_PROXY_FILE} ]; then
        sudo bash -c "cat <<EOF > ${OSM_APT_PROXY}
Acquire::http { Proxy \"${OSM_APT_PROXY}\"; }
EOF"
    else
        sudo sed -i "s|Proxy.*|Proxy \"${OSM_APT_PROXY}\"; }|" ${OSM_APT_PROXY_FILE}
    fi
    sudo apt-get update || FATAL "Configured apt proxy, but couldn't run 'apt-get update'. Check ${OSM_APT_PROXY_FILE}"
    track prereq apt_proxy_configured_ok
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function ask_proceed() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function

    [ -z "$ASSUME_YES" ] && ! ask_user "The installation will do the following
    1. Install required packages
    2. Install docker CE
    3. Disable swap space
    4. Install and initialize Kubernetes
    as pre-requirements.
    Do you want to proceed (Y/n)? " y && echo "Cancelled!" && exit 1

    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function check_osm_behind_proxy() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function

    export OSM_BEHIND_PROXY=""
    export OSM_PROXY_ENV_VARIABLES=""
    [ -n "${http_proxy}" ] && OSM_BEHIND_PROXY="y" && echo "http_proxy=${http_proxy}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} http_proxy"
    [ -n "${https_proxy}" ] && OSM_BEHIND_PROXY="y" && echo "https_proxy=${https_proxy}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} https_proxy"
    [ -n "${HTTP_PROXY}" ] && OSM_BEHIND_PROXY="y" && echo "HTTP_PROXY=${HTTP_PROXY}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} HTTP_PROXY"
    [ -n "${HTTPS_PROXY}" ] && OSM_BEHIND_PROXY="y" && echo "https_proxy=${HTTPS_PROXY}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} HTTPS_PROXY"
    [ -n "${no_proxy}" ] && echo "no_proxy=${no_proxy}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} no_proxy"
    [ -n "${NO_PROXY}" ] && echo "NO_PROXY=${NO_PROXY}" && OSM_PROXY_ENV_VARIABLES="${OSM_PROXY_ENV_VARIABLES} NO_PROXY"

    echo "OSM_BEHIND_PROXY=${OSM_BEHIND_PROXY}"
    echo "OSM_PROXY_ENV_VARIABLES=${OSM_PROXY_ENV_VARIABLES}"

    if [ -n "${OSM_BEHIND_PROXY}" ]; then
        [ -z "$ASSUME_YES" ] && ! ask_user "
The following env variables have been found for the current user:
${OSM_PROXY_ENV_VARIABLES}.

This suggests that this machine is behind a proxy and a special configuration is required.
The installer will install Docker CE and a Kubernetes to work behind a proxy using those
env variables.

Take into account that the installer uses apt, curl, wget and docker.
Depending on the program, the env variables to work behind a proxy might be different
(e.g. http_proxy vs HTTP_PROXY).

For that reason, it is strongly recommended that at least http_proxy, https_proxy, HTTP_PROXY
and HTTPS_PROXY are defined.

Finally, some of the programs (apt) are run as sudoer, requiring that those env variables
are also set for root user. If you are not sure whether those variables are configured for
the root user, you can stop the installation now.

Do you want to proceed with the installation (Y/n)? " y && echo "Cancelled!" && exit 1
    else
        echo "This machine is not behind a proxy"
    fi

    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function find_devops_folder() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    if [ -z "$OSM_DEVOPS" ]; then
        echo -e "\nCreating temporary dir for OSM installation"
        OSM_DEVOPS="$(mktemp -d -q --tmpdir "installosm.XXXXXX")"
        trap 'rm -rf "$OSM_DEVOPS"' EXIT
        git clone https://osm.etsi.org/gerrit/osm/devops.git $OSM_DEVOPS
    fi
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function install_docker_ce() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    DOCKER_CE_OPTS="-D ${OSM_DEVOPS} ${DEBUG_INSTALL}"
    [ -n "${DOCKER_PROXY_URL}" ] && DOCKER_CE_OPTS="${DOCKER_CE_OPTS} -p ${DOCKER_PROXY_URL}"
    [ -n "${OSM_BEHIND_PROXY}" ] && DOCKER_CE_OPTS="${DOCKER_CE_OPTS} -P"
    $OSM_DEVOPS/installers/install_docker_ce.sh ${DOCKER_CE_OPTS} || FATAL_TRACK docker_ce "install_docker_ce.sh failed"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function install_k8s_cluster() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    if [ "${K8S_CLUSTER_ENGINE}" == "kubeadm" ]; then
        KUBEADM_INSTALL_OPTS="-d ${OSM_WORK_DIR} -D ${OSM_DEVOPS} ${DEBUG_INSTALL}"
        $OSM_DEVOPS/installers/install_kubeadm_cluster.sh ${KUBEADM_INSTALL_OPTS} || \
        FATAL_TRACK k8scluster "install_kubeadm_cluster.sh failed"
        K8SCLUSTER_ADDONS_INSTALL_OPTS="-i ${OSM_DEFAULT_IP} -d ${OSM_WORK_DIR} -D ${OSM_DEVOPS} ${DEBUG_INSTALL} --all"
        $OSM_DEVOPS/installers/install_cluster_addons.sh ${K8SCLUSTER_ADDONS_INSTALL_OPTS} || \
        FATAL_TRACK k8scluster "install_cluster_addons.sh failed for kubeadm cluster"
    elif [ "${K8S_CLUSTER_ENGINE}" == "k3s" ]; then
        K3S_INSTALL_OPTS="-i ${OSM_DEFAULT_IP} -D ${OSM_DEVOPS} ${DEBUG_INSTALL}"
        [ "${OSM_K8S_EXTERNAL_IP}" != "${OSM_DEFAULT_IP}" ] && K3S_INSTALL_OPTS="${K3S_INSTALL_OPTS} -e ${OSM_K8S_EXTERNAL_IP}"
        [ -n "${DOCKER_PROXY_URL}" ] && K3S_INSTALL_OPTS="${K3S_INSTALL_OPTS} -p ${DOCKER_PROXY_URL}"
        [ -n "${DOCKER_REGISTRY_URL}" ] && K3S_INSTALL_OPTS="${K3S_INSTALL_OPTS} -d ${DOCKER_REGISTRY_URL}"
        [ -n "${DOCKER_REGISTRY_USER}" ] && K3S_INSTALL_OPTS="${K3S_INSTALL_OPTS} -u ${DOCKER_REGISTRY_USER}"
        [ -n "${DOCKER_REGISTRY_PASSWORD}" ] && K3S_INSTALL_OPTS="${K3S_INSTALL_OPTS} -P ${DOCKER_REGISTRY_PASSWORD}"
        # The K3s installation script will automatically take the HTTP_PROXY, HTTPS_PROXY and NO_PROXY,
        # as well as the CONTAINERD_HTTP_PROXY, CONTAINERD_HTTPS_PROXY and CONTAINERD_NO_PROXY variables
        # from the shell, if they are present, and write them to the environment file of k3s systemd service,
        $OSM_DEVOPS/installers/install_k3s_cluster.sh ${K3S_INSTALL_OPTS} || \
        FATAL_TRACK k8scluster "install_k3s_cluster.sh failed"
        K8SCLUSTER_ADDONS_INSTALL_OPTS="-i ${OSM_DEFAULT_IP} -d ${OSM_WORK_DIR} -D ${OSM_DEVOPS} ${DEBUG_INSTALL} --certmgr --nginx"
        $OSM_DEVOPS/installers/install_cluster_addons.sh ${K8SCLUSTER_ADDONS_INSTALL_OPTS} || \
        FATAL_TRACK k8scluster "install_cluster_addons.sh failed for k3s cluster"
    fi
    echo "Updating fsnotify settings of the system kernel"
    sudo bash -c "sysctl -w fs.inotify.max_user_watches=699050 > /etc/sysctl.d/99-custom-osm-sysctl.conf"
    sudo bash -c "sysctl -w fs.inotify.max_user_instances=10922 >> /etc/sysctl.d/99-custom-osm-sysctl.conf"
    sudo bash -c "sysctl -w fs.inotify.max_queued_events=1398101 >> /etc/sysctl.d/99-custom-osm-sysctl.conf"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function deploy_osm() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    deploy_osm_helm_chart
    track deploy_osm deploy_mongodb_ok
    track deploy_osm deploy_osm_services_k8s_ok
    track deploy_osm install_osm_ngsa_ok
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function setup_external_ip() {
    echo "Determining IP address of the interface with the default route"
    [ -z "$OSM_DEFAULT_IF" ] && OSM_DEFAULT_IF=$(ip route list|awk '$1=="default" {print $5; exit}')
    [ -z "$OSM_DEFAULT_IF" ] && OSM_DEFAULT_IF=$(route -n |awk '$1~/^0.0.0.0/ {print $8; exit}')
    [ -z "$OSM_DEFAULT_IF" ] && FATAL "Not possible to determine the interface with the default route 0.0.0.0"
    OSM_DEFAULT_IP=`ip -o -4 a s ${OSM_DEFAULT_IF} |awk '{split($4,a,"/"); print a[1]; exit}'`
    [ -z "$OSM_DEFAULT_IP" ] && FATAL "Not possible to determine the IP address of the interface with the default route"
    OSM_K8S_EXTERNAL_IP=${OSM_K8S_EXTERNAL_IP:-${OSM_DEFAULT_IP}}
}

function install_osm() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function

    trap ctrl_c INT

    check_osm_behind_proxy
    check_packages "git wget curl tar"
    find_devops_folder

    track start release $RELEASE none none docker_tag $OSM_DOCKER_TAG none none installation_type $OSM_INSTALLATION_TYPE none none os_info $os_info none none

    track checks checkingroot_ok
    [ "$USER" == "root" ] && FATAL "You are running the installer as root. The installer is prepared to be executed as a normal user with sudo privileges."
    track checks noroot_ok
    ask_proceed
    track checks proceed_ok

    echo "Installing OSM"

    [ -n "$DOCKER_REGISTRY_URL" ] && parse_docker_registry_url

    echo "Setting up external IP address"
    setup_external_ip

    # configure apt proxy
    [ -n "$APT_PROXY_URL" ] && configure_apt_proxy $APT_PROXY_URL

    track prereq prereqok_ok

    if [ -n "$INSTALL_DOCKER" ] || [ "${K8S_CLUSTER_ENGINE}" == "kubeadm" ]; then
        if [ "${K8S_CLUSTER_ENGINE}" == "kubeadm" ]; then
            echo "Kubeadm requires docker, so docker will be installed."
        fi
        install_docker_ce
        [ -n "${DOCKER_REGISTRY_URL}" ] && docker_login
    fi
    track docker_ce docker_ce_ok

    echo "Installing helm client ..."
    $OSM_DEVOPS/installers/install_helm_client.sh -D ${OSM_DEVOPS} ${DEBUG_INSTALL} || \
    FATAL_TRACK k8scluster "install_helm_client.sh failed"
    track helm_client install_helm_client_ok

    echo "Installing K8s cluster ..."
    install_k8s_cluster
    kubectl create namespace ${OSM_NAMESPACE}
    track k8scluster k8scluster_ok

    # Install mgmt cluster
    echo "Installing mgmt cluster ..."
    MGMTCLUSTER_INSTALL_OPTS="-D ${OSM_DEVOPS} ${DEBUG_INSTALL}"
    [ -n "${INSTALL_MGMT_CLUSTER}" ] || MGMTCLUSTER_INSTALL_OPTS="${MGMTCLUSTER_INSTALL_OPTS} --no-mgmt-cluster"
    [ -n "${INSTALL_AUX_CLUSTER}" ] || MGMTCLUSTER_INSTALL_OPTS="${MGMTCLUSTER_INSTALL_OPTS} --no-aux-cluster"
    export KUBECONFIG_MGMT_CLUSTER=${KUBECONFIG_MGMT_CLUSTER:-"$HOME/.kube/config"}
    export KUBECONFIG_AUX_CLUSTER=${KUBECONFIG_AUX_CLUSTER:-"$HOME/.kube/config"}
    MGMTCLUSTER_INSTALL_OPTS="${MGMTCLUSTER_INSTALL_OPTS} -M ${KUBECONFIG_MGMT_CLUSTER}"
    MGMTCLUSTER_INSTALL_OPTS="${MGMTCLUSTER_INSTALL_OPTS} -G ${KUBECONFIG_AUX_CLUSTER}"
    echo "Options: ${MGMTCLUSTER_INSTALL_OPTS}"
    $OSM_DEVOPS/installers/mgmt-cluster/install_mgmt_cluster.sh ${MGMTCLUSTER_INSTALL_OPTS} || \
    FATAL_TRACK mgmtcluster "install_mgmt_cluster.sh failed"
    if [ -n "${INSTALL_MGMT_CLUSTER}" ]; then
        echo "Credentials stored under ${HOME}/.osm/.credentials"
        echo "Repos stored under ${HOME}/.osm/repos"
    fi
    track mgmtcluster mgmt_and_aux_cluster_ok

    # Deploy OSM (OSM helm chart)
    echo "Deploying OSM in the K8s cluster ..."
    deploy_osm

    if [ -n "$INSTALL_K8S_MONITOR" ]; then
        # install OSM MONITORING
        install_k8s_monitoring
        track deploy_osm install_k8s_monitoring_ok
    fi

    [ -z "$INSTALL_NOHOSTCLIENT" ] && echo "Installing osmclient ..." && install_osmclient
    track osmclient osmclient_ok

    echo -e "Checking OSM health state..."
    $OSM_DEVOPS/installers/osm_health.sh -s ${OSM_NAMESPACE} -k || \
    (echo -e "OSM is not healthy, but will probably converge to a healthy state soon." && \
    echo -e "Check OSM status with: kubectl -n ${OSM_NAMESPACE} get all" && \
    track healthchecks osm_unhealthy didnotconverge)
    track healthchecks after_healthcheck_ok

    echo -e "Adding local K8s cluster _system-osm-k8s to OSM ..."
    add_local_k8scluster
    track final_ops add_local_k8scluster_ok

    wget -q -O- https://osm-download.etsi.org/ftp/osm-16.0-sixteen/README2.txt &> /dev/null
    track end
    sudo find /etc/osm
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
    return 0
}

function install_k8s_monitoring() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    # install OSM monitoring
    sudo $OSM_DEVOPS/installers/k8s/install_osm_k8s_monitoring.sh -o ${OSM_NAMESPACE} || FATAL_TRACK install_k8s_monitoring "k8s/install_osm_k8s_monitoring.sh failed"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function dump_vars(){
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "APT_PROXY_URL=$APT_PROXY_URL"
    echo "K8S_CLUSTER_ENGINE=$K8S_CLUSTER_ENGINE"
    echo "DEBUG_INSTALL=$DEBUG_INSTALL"
    echo "DOCKER_PROXY_URL=$DOCKER_PROXY_URL"
    echo "DOCKER_REGISTRY_URL=$DOCKER_REGISTRY_URL"
    echo "DOCKER_USER=$DOCKER_USER"
    echo "INSTALL_K8S_MONITOR=$INSTALL_K8S_MONITOR"
    echo "INSTALL_DOCKER=$INSTALL_DOCKER"
    echo "OSM_DEVOPS=$OSM_DEVOPS"
    echo "OSM_DOCKER_TAG=$OSM_DOCKER_TAG"
    echo "OSM_K8S_EXTERNAL_IP=$OSM_K8S_EXTERNAL_IP"
    echo "OSM_HELM_WORK_DIR=$OSM_HELM_WORK_DIR"
    echo "OSM_NAMESPACE=$OSM_NAMESPACE"
    echo "OSM_WORK_DIR=$OSM_WORK_DIR"
    echo "PULL_IMAGES=$PULL_IMAGES"
    echo "RELEASE=$RELEASE"
    echo "REPOSITORY=$REPOSITORY"
    echo "REPOSITORY_BASE=$REPOSITORY_BASE"
    echo "REPOSITORY_KEY=$REPOSITORY_KEY"
    echo "SHOWOPTS=$SHOWOPTS"
    echo "UNINSTALL=$UNINSTALL"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function parse_docker_registry_url() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    DOCKER_REGISTRY_USER=$(echo "$DOCKER_REGISTRY_URL" | awk '{split($1,a,"@"); split(a[1],b,":"); print b[1]}')
    DOCKER_REGISTRY_PASSWORD=$(echo "$DOCKER_REGISTRY_URL" | awk '{split($1,a,"@"); split(a[1],b,":"); print b[2]}')
    DOCKER_REGISTRY_URL=$(echo "$DOCKER_REGISTRY_URL" | awk '{split($1,a,"@"); print a[2]}')
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function ctrl_c() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "** Trapped CTRL-C"
    FATAL "User stopped the installation"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

UNINSTALL=""
SHOWOPTS=""
ASSUME_YES=""
APT_PROXY_URL=""
K8S_CLUSTER_ENGINE="k3s"
DEBUG_INSTALL=""
RELEASE="testing-daily"
REPOSITORY="testing"
INSTALL_K8S_MONITOR=""
INSTALL_DOCKER=""
INSTALL_NOHOSTCLIENT=""
INSTALL_AUX_CLUSTER="y"
INSTALL_MGMT_CLUSTER="y"
OSM_DEVOPS=
OSM_NAMESPACE=osm
REPOSITORY_KEY="OSM%20ETSI%20Release%20Key.gpg"
REPOSITORY_BASE="https://osm-download.etsi.org/repository/osm/debian"
OSM_WORK_DIR="/etc/osm"
OSM_HELM_WORK_DIR="${OSM_WORK_DIR}/helm"
OSM_HOST_VOL="/var/lib/osm"
OSM_NAMESPACE_VOL="${OSM_HOST_VOL}/${OSM_NAMESPACE}"
OSM_DOCKER_TAG="testing-daily"
DOCKER_USER=opensourcemano
PULL_IMAGES="y"
KAFKA_TAG=2.11-1.0.2
KIWIGRID_K8S_SIDECAR_TAG="1.15.6"
PROMETHEUS_TAG=v2.28.1
GRAFANA_TAG=8.1.1
PROMETHEUS_NODE_EXPORTER_TAG=0.18.1
PROMETHEUS_CADVISOR_TAG=latest
KEYSTONEDB_TAG=10
OSM_DATABASE_COMMONKEY=
ELASTIC_VERSION=6.4.2
ELASTIC_CURATOR_VERSION=5.5.4
POD_NETWORK_CIDR=10.244.0.0/16
K8S_MANIFEST_DIR="/etc/kubernetes/manifests"
RE_CHECK='^[a-z0-9]([-a-z0-9]*[a-z0-9])?$'
DOCKER_REGISTRY_URL=
DOCKER_PROXY_URL=
MODULE_DOCKER_TAG=
OSM_INSTALLATION_TYPE="Default"

while getopts ":a:c:e:r:n:k:u:R:D:o:O:N:s:t:U:l:L:K:d:p:T:f:F:G:M:-: hy" o; do
    case "${o}" in
        a)
            APT_PROXY_URL=${OPTARG}
            ;;
        c)
            K8S_CLUSTER_ENGINE=${OPTARG}
            [ "${K8S_CLUSTER_ENGINE}" == "kubeadm" ] && continue
            [ "${K8S_CLUSTER_ENGINE}" == "k3s" ] && continue
            echo -e "Invalid argument for -c : ' ${K8S_CLUSTER_ENGINE}'\n" >&2
            usage && exit 1
            ;;
        e)
            OSM_K8S_EXTERNAL_IP="${OPTARG}"
            ;;
        r)
            REPOSITORY="${OPTARG}"
            REPO_ARGS+=(-r "$REPOSITORY")
            ;;
        k)
            REPOSITORY_KEY="${OPTARG}"
            REPO_ARGS+=(-k "$REPOSITORY_KEY")
            ;;
        u)
            REPOSITORY_BASE="${OPTARG}"
            REPO_ARGS+=(-u "$REPOSITORY_BASE")
            ;;
        R)
            RELEASE="${OPTARG}"
            REPO_ARGS+=(-R "$RELEASE")
            ;;
        D)
            OSM_DEVOPS="${OPTARG}"
            ;;
        s)
            OSM_NAMESPACE="${OPTARG}" && [[ ! "${OPTARG}" =~ $RE_CHECK ]] && echo "Namespace $OPTARG is invalid. Regex used for validation is $RE_CHECK" && exit 0
            ;;
        t)
            OSM_DOCKER_TAG="${OPTARG}"
            REPO_ARGS+=(-t "$OSM_DOCKER_TAG")
            ;;
        U)
            DOCKER_USER="${OPTARG}"
            ;;
        K)
            CONTROLLER_NAME="${OPTARG}"
            ;;
        d)
            DOCKER_REGISTRY_URL="${OPTARG}"
            ;;
        p)
            DOCKER_PROXY_URL="${OPTARG}"
            ;;
        T)
            MODULE_DOCKER_TAG="${OPTARG}"
            ;;
        M)
            KUBECONFIG_MGMT_CLUSTER="${OPTARG}"
            ;;
        G)
            KUBECONFIG_AUX_CLUSTER="${OPTARG}"
            ;;
        -)
            [ "${OPTARG}" == "help" ] && usage && exit 0
            [ "${OPTARG}" == "debug" ] && DEBUG_INSTALL="--debug" && continue
            [ "${OPTARG}" == "uninstall" ] && UNINSTALL="y" && continue
            [ "${OPTARG}" == "no-mgmt-cluster" ] && INSTALL_MGMT_CLUSTER="" && continue
            [ "${OPTARG}" == "no-aux-cluster" ] && INSTALL_AUX_CLUSTER="" && continue
            [ "${OPTARG}" == "docker" ] && INSTALL_DOCKER="y" && continue
            [ "${OPTARG}" == "nodocker" ] && INSTALL_DOCKER="" && continue
            [ "${OPTARG}" == "showopts" ] && SHOWOPTS="y" && continue
            [ "${OPTARG}" == "nohostclient" ] && INSTALL_NOHOSTCLIENT="y" && continue
            [ "${OPTARG}" == "k8s_monitor" ] && INSTALL_K8S_MONITOR="y" && continue
            echo -e "Invalid option: '--$OPTARG'\n" >&2
            usage && exit 1
            ;;
        :)
            echo "Option -$OPTARG requires an argument" >&2
            usage && exit 1
            ;;
        \?)
            echo -e "Invalid option: '-$OPTARG'\n" >&2
            usage && exit 1
            ;;
        h)
            usage && exit 0
            ;;
        y)
            ASSUME_YES="y"
            ;;
        *)
            usage && exit 1
            ;;
    esac
done

source $OSM_DEVOPS/common/all_funcs

[ -z "${DEBUG_INSTALL}" ] || DEBUG Debug is on
[ -n "$SHOWOPTS" ] && dump_vars && exit 0

# Uninstall if "--uninstall"
if [ -n "$UNINSTALL" ]; then
    ${OSM_DEVOPS}/installers/uninstall_osm.sh "$@" || \
    FATAL_TRACK community_uninstall "uninstall_osm.sh failed"
    echo -e "\nDONE"
    exit 0
fi

# Installation starts here

# Get README and create OSM_TRACK_INSTALLATION_ID
wget -q -O- https://osm-download.etsi.org/ftp/osm-16.0-sixteen/README.txt &> /dev/null
export OSM_TRACK_INSTALLATION_ID="$(date +%s)-$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16)"

# Get OS info to be tracked
os_distro=$(lsb_release -i 2>/dev/null | awk '{print $3}')
echo $os_distro
os_release=$(lsb_release -r 2>/dev/null | awk '{print $2}')
echo $os_release
os_info="${os_distro}_${os_release}"
os_info="${os_info// /_}"

# Community_installer
# This is where installation starts
install_osm
echo -e "\nDONE"
exit 0