#!/usr/bin/env bash
# -----------------------------------------------------------------------
# Copyright 2018-2023 Open Networking Foundation (ONF) and the ONF Contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------
# helmlint.sh
# run `helm lint` on all helm charts that are found
# -----------------------------------------------------------------------

# [TODO] use set -e else errors can fly under the radar
set +e -o pipefail

declare -g iam="${0##*/}"

# verify that we have helm installed
command -v helm >/dev/null 2>&1 || { echo "helm not found, please install it" >&2; exit 1; }

echo "# helmlint.sh, using helm version: $(helm version -c --short) #"

# Collect success/failure, and list/types of failures
fail_lint=0
declare -a failed_deps=()
declare -a failed_lint=()
declare -a failed_reqs=()

# when not running under Jenkins, use current dir as workspace
WORKSPACE=${WORKSPACE:-.}

# cleanup repos if `clean` option passed as parameter
# update then move set -u to set [+-]e -o pipefail above
# if [[ $# -gt 0 ]] && [[ "$1" = 'clean' ]]; then <--- allow set -u
if [ "$1" = "clean" ]
then
  echo "Removing any downloaded charts"
  find "${WORKSPACE}" -type d -name 'charts' -exec rm -rf {} \;
fi

# now that $1 is checked, error on undefined vars
set -u

# loop on result of 'find -name Chart.yaml'
while IFS= read -r -d '' chart
do
  chartdir=$(dirname "${chart}")

  echo "Checking chart: $chartdir"

  # update dependencies (if any)
  if ! helm dependency update "${chartdir}";
  then
      fail_lint=1
      failed_deps+=("${chartdir}")
  fi

  # lint the chart (with values.yaml if it exists)
  if [ -f "${chartdir}/values.yaml" ]; then
    helm lint --strict --values "${chartdir}/values.yaml" "${chartdir}"
  else
    helm lint --strict "${chartdir}"
  fi

  rc=$?
  if [[ $rc != 0 ]]; then
    fail_lint=1
    failed_lint+=("${chartdir}")
  fi

  # -----------------------------------------------------------------------
  # check that requirements are available if they're specified
  # how is this check different than helm dep up above ?
  # -----------------------------------------------------------------------
  # later helm versions allow requirements.yaml to be defined directly in
  # Chart.yaml so an explicit check may no longer be needed.
  # 
  # Should we err when requirements.yaml detected to cleanup old code ?
  # -----------------------------------------------------------------------
  if [ -f "${chartdir}/requirements.yaml" ];
  then
    echo "Chart has requirements.yaml, checking availability"
    if ! helm dependency update "${chartdir}"; then
       fail_lint=1
       failed_reqs+=("${chartdir}")
    fi

    # remove charts dir after checking for availability, as this chart might be
    # required by other charts in the next loop
    rm -rf "${chartdir}/charts"
  fi

done < <(find "${WORKSPACE}" -name Chart.yaml -print0)

if [[ $fail_lint != 0 ]]; then
    cat <<EOM

** -----------------------------------------------------------------------
** ${iam}: Errors Detected
** -----------------------------------------------------------------------
EOM

    #   echo "Charts that failed to lint: $failed_lint"
  if [ ${#failed_lint[@]} -gt 0 ]; then
      echo "Charts that failed to lint:"
      for chart in "${failed_lint[@]}";
      do
	  echo "    $chart"
      done
  fi

  if [ ${#failed_deps[@]} -gt 0 ]; then
      echo "Charts that failed helm dependency update:"
      for chart in "${failed_deps[@]}";
      do
	  echo "    $chart"
      done
  fi

  if [ ${#failed_reqs[@]} -gt 0 ]; then
      echo "Charts with failures in requirements.yaml:"
      for chart in "${failed_reqs[@]}";
      do
	  echo "    $chart"
      done
  fi

  echo
  echo "See Also:"
  echo "  o https://wiki.opennetworking.org/display/VOLTHA/make+lint-helm"
  
  echo
  exit 1
fi

echo "# helmlint.sh Success! - all charts linted and have valid requirements.yaml #"

exit 0