#!/usr/bin/env bash

set -e

MINIKUBE_VERSION=${MINIKUBE_VERSION:-v1.9.2}

PREFIX_DIR=/usr/local
BIN_DIR=${PREFIX_DIR}/bin

MINIKUBE_PREFIX_DIR=${PREFIX_DIR}/apps/minikube
MINIKUBE_DEST_DIR=${MINIKUBE_PREFIX_DIR}/${MINIKUBE_VERSION}
MINIKUBE_CURRENT=${MINIKUBE_PREFIX_DIR}/current

if [[ $(uname) =~ Linux ]]; then
    OS=linux
elif [[  $(uname) =~ Darwin ]]; then
    OS=darwin
else
    echo unsupported os: $(uname)
    exit 1
fi

ARCH=
if [[ $(uname -m) == x86_64 ]]; then
    ARCH=amd64
else
    echo arch not yet supported: $(uname -m)
    exit 1
fi

TMP_DIR=
if [[ ! -d ${MINIKUBE_DEST_DIR} ]]; then
    sudo mkdir -p ${MINIKUBE_DEST_DIR}
    TMP_DIR=$(mktemp --directory)
    DEST_FILE=${TMP_DIR}/minikube
    URL=https://github.com/kubernetes/minikube/releases/download/${MINIKUBE_VERSION}/minikube-${OS}-${ARCH}
    echo downloading minikube ${MINIKUBE_VERSION} to temp directory ${TMP_DIR}
    curl --silent --location --output ${DEST_FILE} ${URL}

    sudo chmod 755 ${DEST_FILE}
    sudo mv ${DEST_FILE} ${MINIKUBE_DEST_DIR}
    sudo chown --recursive root:root ${MINIKUBE_DEST_DIR}
else
    echo minikube ${MINIKUBE_VERSION} already installed
fi

cd ${MINIKUBE_PREFIX_DIR}
[[ -s current ]] && sudo unlink current
sudo ln --symbolic ${MINIKUBE_VERSION}/ current
echo current version set to ${MINIKUBE_VERSION}
cd ${BIN_DIR}
[[ -L ${BIN_DIR}/minikube ]] || sudo ln --symbolic ${MINIKUBE_CURRENT}/minikube

if [[ $TMP_DIR != "" ]]; then
    rm -rf ${TMP_DIR}
    echo removed up temp directory ${TMP_DIR}
fi