metricLabel="[Metric]"

# Copies vmagent config file to the configured metric path.
function cmdMetricPreparation() {
    printInfo "$metricLabel Preparation..."

    mkdir -p -- "$(dirname -- "$metricVmagentPath")" || return 1
    cp -f -- "$appAssetsPath/metric/vmagent.yml" "$metricVmagentPath/vmagent.yml"

    printSuccess "$metricLabel Preparatory completed"
}

# Renders the Metric Kubernetes YAML manifest via Helm.
function cmdMetricYamlRender() {
    printInfo "$metricLabel Render YAML | Helm"

    local templateFile="templates/$metricKube.yaml"
    [[ -f "$appAssetsPath/k3s/$templateFile" ]] || {
        printDanger "$metricLabel Template YAML  : File not found | $appAssetsPath/k3s/$templateFile"
        return 1
    }
    printInfo "$metricLabel Template YAML  : $appAssetsPath/k3s/$templateFile"

    local varsFile
    varsFile=$(mktemp "/tmp/$metricKube.vars.XXXXXX.yaml") || return 1
    printInfo "$metricLabel Variables      : $varsFile"
    trap 'rm -f -- "$varsFile"' RETURN
    cat > "$varsFile" <<EOF
metricHelm: true
namespace: $k3sNamespace
metric: $metricKube
metricApiUrl: $metricApiUrl
metricPromPath: $metricPromPath
metricVmagentPath: $metricVmagentPath
EOF

    printInfo "$metricLabel Render file    : $metricYaml"
    mkdir -p -- "$(dirname -- "$metricYaml")" || return 1
    fileBackup "$metricYaml"
    helm template stack "$appAssetsPath/k3s" -f "$varsFile" --show-only "$templateFile" > "$metricYaml" || {
        printDanger "$metricLabel Render failed"
        return 1
    }

    printSuccess "$metricLabel Render completed"
}

# Installs Metric components into Kubernetes.
function cmdMetricInstall() {
    cmdMetricPreparation || return 1
    cmdMetricYamlRender || return 1
    cmdK3sYamlApplyEx "$metricYaml"
}

# Uninstalls Metric Kubernetes resources.
function cmdMetricUninstall() {
    "$k3sCmd" kubectl delete -f "$metricYaml"
}