#!/bin/bash
set -euo pipefail

SCRIPTPATH="$( cd "$(dirname "$0")" ; pwd -P )"

PLATFORM=$(uname | tr '[:upper:]' '[:lower:]')
HELM_VERSION="3.2.0"
NAMESPACE="default"

MAKEFILEPATH=$SCRIPTPATH/../Makefile
VERSION=$(make -s -f $MAKEFILEPATH version)
BUILD_DIR=$SCRIPTPATH/../build/k8s-resources/$VERSION
INDV_RESOURCES_DIR=$BUILD_DIR/individual-resources
TAR_RESOURCES_FILE=$BUILD_DIR/individual-resources.tar
AGG_RESOURCES_YAML=$BUILD_DIR/all-resources.yaml
mkdir -p $INDV_RESOURCES_DIR

USAGE=$(cat << 'EOM'
  Usage: generate-k8s-yaml  [-n <K8s_NAMESPACE>]
  Generates the kubernetes yaml resource files from the helm chart
  and places them into the build dir.
  Example: generate-k8s-yaml -n kube-system
          Optional:
            -n          Kubernetes namespace
EOM
)

# Process our input arguments
while getopts "n:" opt; do
  case ${opt} in
    n ) # K8s namespace
        NAMESPACE=$OPTARG
      ;;
    \? )
        echoerr "$USAGE" 1>&2
        exit
      ;;
  esac
done

curl -L https://get.helm.sh/helm-v$HELM_VERSION-$PLATFORM-amd64.tar.gz | tar zxf - -C $BUILD_DIR
mv $BUILD_DIR/$PLATFORM-amd64/helm $BUILD_DIR/.
rm -rf $BUILD_DIR/$PLATFORM-amd64
chmod +x $BUILD_DIR/helm

$BUILD_DIR/helm template amazon-ec2-metadata-mock \
    --no-hooks \
    --namespace $NAMESPACE \
    $SCRIPTPATH/../helm/amazon-ec2-metadata-mock/ > $AGG_RESOURCES_YAML

# remove helm annotations from template
cat $AGG_RESOURCES_YAML | grep -v 'helm.sh\|app.kubernetes.io/managed-by: Helm' > $BUILD_DIR/helm_annotations_removed.yaml
mv $BUILD_DIR/helm_annotations_removed.yaml $AGG_RESOURCES_YAML

$BUILD_DIR/helm template amazon-ec2-metadata-mock \
    --no-hooks \
    --namespace $NAMESPACE \
    --set targetNodeOs="linux windows" \
    --output-dir $INDV_RESOURCES_DIR/ \
    $SCRIPTPATH/../helm/amazon-ec2-metadata-mock/

# remove helm annotations from template
for i in $INDV_RESOURCES_DIR/amazon-ec2-metadata-mock/templates/*; do
    if [ -f $i ]; then # ignore helm tests
        cat $i | grep -v 'helm.sh\|app.kubernetes.io/managed-by: Helm' > $BUILD_DIR/helm_annotations_removed.yaml
        mv $BUILD_DIR/helm_annotations_removed.yaml $i
    fi
done

cd $INDV_RESOURCES_DIR/amazon-ec2-metadata-mock/ && tar cvf $TAR_RESOURCES_FILE templates/*
cd $SCRIPTPATH

echo "Generated amazon-ec2-metadata-mock kubernetes yaml resources files in:"
echo "    - $AGG_RESOURCES_YAML"
echo "    - $TAR_RESOURCES_FILE"