#!/usr/bin/env bash
#
# Setup a local k8s minikube cluster
# with k8s dashboard and flux
#

set -o pipefail

PRJ="flux"
readonly PRJ
USE_TF=0
readonly USE_TF
GITEA_HOSTNAME="git.e2m.io"
readonly GITEA_HOSTNAME
GITEA_USER="obch-flux"
readonly GITEA_USER
FLUX_VERSION="2.2.1"
readonly FLUX_VERSION
FLUX_CHECKSUM="466756ca6b3437d30a6a5fb58e60f3e5a82d8291f3869cfc55b6f041962601b5"
readonly FLUX_CHECKSUM
FLUX_ARCHIVE_LINUX="flux_${FLUX_VERSION}_linux_amd64.tar.gz"
readonly FLUX_ARCHIVE_LINUX
FLUX_ARCHIVE_MACOS="flux_${FLUX_VERSION}_darwin_arm64.tar.gz"
readonly FLUX_ARCHIVE_MACOS
FLUX_URL_LINUX="https://github.com/fluxcd/flux2/releases/download/v${FLUX_VERSION}/${FLUX_ARCHIVE_LINUX}"
readonly FLUX_URL_LINUX
FLUX_URL_MACOS="https://github.com/fluxcd/flux2/releases/download/v${FLUX_VERSION}/${FLUX_ARCHIVE_MACOS}"
readonly FLUX_URL_MACOS
FLUX_FORCE_LOCAL=1
readonly FLUX_FORCE_LOCAL
TF_VERSION="1.6.6"
readonly TF_VERSION
TF_ARCHIVE_LINUX="terraform_${TF_VERSION}_linux_amd64.zip"
readonly TF_ARCHIVE_LINUX
TF_ARCHIVE_MACOS="terraform_${TF_VERSION}_darwin_arm64.zip"
readonly TF_ARCHIVE_MACOS
TF_CHECKSUM=""
readonly TF_CHECKSUM
TF_FORCE_LOCAL=1
readonly TF_FORCE_LOCAL
OS="Linux"
VERBOSE=0
readonly VERBOSE

minikube_driver="podman"

if [[ $(uname) == "Darwin" ]]; then
    OS="macos"
elif [[ $(grep '^ID=' /etc/os-release | awk -F'=' '{print $2}') == "ubuntu" ]]; then
    OS="ubuntu"
fi

printf "Running on ${OS}\n"

if [[ "$OS" = "macos" ]]; then
    FLUX_URL="${FLUX_URL_MACOS}"
    FLUX_ARCHIVE="${FLUX_ARCHIVE_MACOS}"
    TF_ARCHIVE="${TF_ARCHIVE_MACOS}"
    TF_URL="https://releases.hashicorp.com/terraform/${TF_VERSION}/${TF_ARCHIVE}"
else
    FLUX_URL="${FLUX_URL_LINUX}"
    FLUX_ARCHIVE="${FLUX_ARCHIVE_LINUX}"
    TF_ARCHIVE="${TF_ARCHIVE_LINUX}"
    TF_URL="https://releases.hashicorp.com/terraform/${TF_VERSION}/${TF_ARCHIVE}"
fi

# We prefer podman but Ubuntu's podman is too old
if [[ ${OS} = "ubuntu" ]]; then
    minikube_driver="docker"
fi

# Start minikube
if ! $(minikube status | grep Nonexistent\|Stopped); then
    printf 'minikube is not running\nStarting minikube..\n'
    # Increase memory from default 2G
    podman machine set --memory=4096
    podman machine start
    minikube config set memory 3800
    if [[ 0 == "${VERBOSE}" ]]; then
        minikube start --driver="${minikube_driver}"
    else
        minikube start --driver="${minikube_driver}" --alsologtostderr -v=7
    fi
else
    printf 'minikube is already running\n'
fi

# Check cluster availability
# TODO: Check for errors
kubectl cluster-info

# Deploy k8s dashboard
if [[ $(kubectl get pods -A -o wide | grep kubernetes-dashboard | grep Running) ]]; then
    printf "Installing k8s dashboard\n"
    # The metrics server collides with kube-prometheus-stack
    #minikube addons enable metrics-server
    minikube dashboard &
else
    printf 'k8s dashboard is already running\n'
fi

# Install terraform if local version enforced
if [[ "$TF_FORCE_LOCAL" = 1 ]]; then
    if [[ -e "$TF_ARCHIVE}" ]]; then
        printf "terraform binary exists\n"
    else
        printf "Fetching terraform archive..\n"
        curl -LO "${TF_URL}"
        unzip -n "${TF_ARCHIVE}"
    fi
    TF_CMD="./terraform"
else
    TF_CMD="terraform"
fi

# Install flux if local version enforced
if [[ "$FLUX_FORCE_LOCAL" = 1 ]]; then
    printf "Fetching flux archive..\n"
    curl -LO "${FLUX_URL}"
    tar xf "${FLUX_ARCHIVE}"
    FLUX_CMD="./flux"
else
    FLUX_CMD="flux"
fi

# Deploy Flux Controllers
# Needs cluster admin privileges
if [[ $(${FLUX_CMD} get helmreleases --all-namespaces) ]]; then
    printf 'Flux controllers are running\n'
fi

# 'flux bootstrap' is idempotent
# We use the Gitea integration with a PAT
# that needs to be supplied to create and write to
# Gitea fluxcd owned repositories
printf 'Installing Flux controller\n'
${FLUX_CMD} bootstrap gitea \
  --hostname="$GITEA_HOSTNAME" \
  --token-auth \
  --owner="$GITEA_USER" \
  --repository="$PRJ"-deploy \
  --branch=main \
  --path=clusters/dev \
  --personal \
  --read-write-key=true \
  --private=false