#!/usr/bin/env bash

function installFavApps() {
  sudo apt update
  # Install my favorite applications and required packages
  sudo apt install htop tmux docker.io conntrack haproxy kubectl
  # Install helm
  curl https://baltocdn.com/helm/signing.asc | sudo apt-key add -
  sudo apt-get install apt-transport-https --yes
  echo "deb https://baltocdn.com/helm/stable/debian/ all main" | sudo tee /etc/apt/sources.list.d/helm-stable-debian.list
  sudo apt-get update
  sudo apt-get install helm
  sudo usermod -aG docker $USER
  echo "Please log out and log back in"
}

function installMinikube() {
  # Download and install minikube
  curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube_latest_amd64.deb
  sudo dpkg -i minikube_latest_amd64.deb
}

function startMinikube() {
  # Start minikube with Docker driver
  minikube start --driver=docker
}

function stopMinikube() {
  minikube tunnel --cleanup
  minikube stop
}

function installHelmApps() {
  helm repo add nginx-stable https://helm.nginx.com/stable
  helm repo add jetstack https://charts.jetstack.io
  helm repo update
  # Install ingress-nginx See: https://artifacthub.io/packages/helm/ingress-nginx/ingress-nginx
  helm install ingress-nginx nginx-stable/nginx-ingress --namespace ingress-nginx --create-namespace -f nginx-values.yml
  # Install cert-manager See: https://artifacthub.io/packages/helm/cert-manager/cert-manager
  helm install ert-manager jetstack/cert-manager --namespace cert-manager --create-namespace --set installCRDs=true
}

function configureHaproxy(){
  # This is required to emulate a LoadBalancer..
  minikube service -n=ingress-nginx ingress-nginx-nginx-ingress
  # Get ip of loadbalancer
  # This is a Go template that extracts the ports corresponding to the nginx controller service's 80 and 443 ports
  # For more information see: https://stackoverflow.com/questions/37648553/is-there-anyway-to-get-the-external-ports-of-the-kubernetes-cluster
  # This is then passed to the prepared template haproxy configuration and the service is restarted
  NGINXPORTS=( $(kubectl get svc -n=ingress-nginx -o go-template='{{range .items}}{{range.spec.ports}}{{if .nodePort}}{{.nodePort}}{{"\n"}}{{end}}{{end}}{{end}}') )
  echo "${NGINXPORTS[0]}"
  sed -i "s|##INSECSERVERPORT##|${NGINXPORTS[0]}|" haproxy-template.cfg
  echo "${NGINXPORTS[1]}"
  sed -i "s|##SERVERPORT##|${NGINXPORTS[1]}|" haproxy-template.cfg
  sudo cp haproxy-template.cfg /etc/haproxy/haproxy.cfg
  sudo systemctl restart haproxy
}

function applyyaml(){
  kubectl apply -f 000-namespace.yml
  kubectl apply -f 001-configmap.yml
  kubectl apply -f 002-deployment.yml
  kubectl apply -f 003-service.yml
  kubectl apply -f 004-cluserissuer.yml
  kubectl apply -f 005-ingress.yml
}

function listCommands() {
cat << EOT
Available commands:

prepare
install
start
stop
reconfigurehaproxy
reapplyyaml
help


EOT
}

# Commands

case $1 in
    "prepare")
        installFavApps
        ;;
    "install")
        installMinikube
        startMinikube
        installHelmApps
        configureHaproxy
        applyyaml
        ;;
    "start")
        startMinikube
        ;;
    "stop")
        stopMinikube
        ;;
    "reconfigurehaproxy")
        configureHaproxy
        ;;
    "reapplyyaml")
        applyyaml
        ;;
    "help")
        listCommands
        ;;
    *)
        echo "No command found."
        echo
        listCommands
esac