#!/bin/bash

set -e

cd $(dirname $0)/..

. ./scripts/version.sh

TRAEFIK_CHART_VERSION=$(yq e '.spec.chart' manifests/traefik.yaml | awk 'match($0, /([0-9.]+)([0-9]{2})/, m) { print m[1]; exit; }')
TRAEFIK_PACKAGE_VERSION=$(yq e '.spec.chart' manifests/traefik.yaml | awk 'match($0, /([0-9.]+)([0-9]{2})/, m) { print m[2]; exit; }')
TRAEFIK_FILE=traefik-${TRAEFIK_CHART_VERSION}${TRAEFIK_PACKAGE_VERSION}.tgz
TRAEFIK_CRD_FILE=traefik-crd-${TRAEFIK_CHART_VERSION}${TRAEFIK_PACKAGE_VERSION}.tgz
TRAEFIK_URL=https://helm.traefik.io/traefik/traefik-${TRAEFIK_CHART_VERSION}.tgz
CHARTS_DIR=build/static/charts
RUNC_DIR=build/src/github.com/opencontainers/runc
DATA_DIR=build/data
export TZ=UTC

umask 022
rm -rf ${CHARTS_DIR}
rm -rf ${RUNC_DIR}
mkdir -p ${CHARTS_DIR}
mkdir -p ${DATA_DIR}

curl --compressed -sfL https://github.com/k3s-io/k3s-root/releases/download/${VERSION_ROOT}/k3s-root-${ARCH}.tar | tar xf - --exclude=bin/socat

git clone --single-branch --branch=${VERSION_RUNC} --depth=1 https://github.com/opencontainers/runc ${RUNC_DIR}

setup_tmp() {
    TMP_DIR=$(mktemp -d --tmpdir=${CHARTS_DIR})
    cleanup() {
        code=$?
        set +e
        trap - EXIT
        rm -rf ${TMP_DIR}
        exit $code
    }
    trap cleanup INT EXIT
}

download_and_package_traefik () {
  echo "Downloading Traefik Helm chart from ${TRAEFIK_URL}"
  curl -sfL ${TRAEFIK_URL} -o ${TMP_DIR}/${TRAEFIK_FILE}
  code=$?

  if [ $code -ne 0 ]; then
    echo "Error: Failed to download Traefik Helm chart!"
    exit $code
  fi

  echo "Uncompress ${TMP_DIR}/${TRAEFIK_FILE}"
  tar xf ${TMP_DIR}/${TRAEFIK_FILE} -C ${TMP_DIR}

  echo "Prepare traefik CRD"
  TRAEFIK_TMP_CHART=${TMP_DIR}/traefik
  TRAEFIK_TMP_CRD=${TRAEFIK_TMP_CHART}-crd

  # Collect information on chart
  name=$(yq e '.name' ${TRAEFIK_TMP_CHART}/Chart.yaml)
  api_version=$(yq e '.apiVersion' ${TRAEFIK_TMP_CHART}/Chart.yaml)
  chart_version=${TRAEFIK_CHART_VERSION}
  package_version=${TRAEFIK_PACKAGE_VERSION}

  # Collect information on CRDs
  crd_apis=()
  for crd_yaml in $(find ${TRAEFIK_TMP_CHART}/crds -type f | sort); do
    echo "Processing CRD at ${crd_yaml}"
    crd_group=$(yq e '.spec.group' ${crd_yaml})
    crd_kind=$(yq e '.spec.names.kind' ${crd_yaml})
    crd_version=$(yq e '.spec.version' ${crd_yaml})
    if [[ -z "$crd_version" ]] || [[ "$crd_version" == "null" ]]; then
      crd_version=$(yq e '.spec.versions[0].name' ${crd_yaml})
    fi
    echo "Found CRD with GVK ${crd_group}/${crd_version}/${crd_kind}"
    crd_apis+=("${crd_group}/${crd_version}/${crd_kind}")
  done

  set_found_crd=$(
  for crd in ${crd_apis[@]}; do
    echo "# {{- set \$found \"${crd}\" false -}}"
  done
  )

  # Copy base template and apply variables to the template
  mkdir -p ${TRAEFIK_TMP_CRD}
  cp -R ./scripts/chart-templates/crd-base/* ${TRAEFIK_TMP_CRD}
  for template_file in $(find ${TRAEFIK_TMP_CRD} -type f | sort); do
    # Applies any environment variables currently set onto your template file
    echo "Templating ${template_file}"
    eval "echo \"$(sed 's/"/\\"/g' ${template_file})\"" > ${template_file}
  done

  # Move anything from ${f}/charts-crd/overlay-upstream to the main chart
  cp -R ${TRAEFIK_TMP_CRD}/overlay-upstream/* ${TRAEFIK_TMP_CHART}
  rm -rf ${TRAEFIK_TMP_CRD}/overlay-upstream

  # Modify charts to support system-default-registry
  echo -e 'global:\n  systemDefaultRegistry: ""' >> ${TRAEFIK_TMP_CHART}/values.yaml
  find ${TRAEFIK_TMP_CHART} -type f | xargs sed -i 's/{{ .Values.image.name }}/{{ template "system_default_registry" .}}&/g'

  # Modify chart version to append package version
  # If we alter our repackaging of the helm chart without also bumping the version of the
  # chart, the package version portion (final two digits) of the version string in the
  # traefik HelmChart manifest should be bumped accordingly.
  sed -i "s/version: .*/&${TRAEFIK_PACKAGE_VERSION}/" ${TRAEFIK_TMP_CHART}/Chart.yaml

  # Add dashboard annotations to main chart
  cat <<EOF >>${TRAEFIK_TMP_CHART}/Chart.yaml
annotations:
  fleet.cattle.io/bundle-id: k3s
EOF

  # Move CRDs from main chart to CRD chart
  mkdir -p ${TRAEFIK_TMP_CRD}/templates
  mv ${TRAEFIK_TMP_CHART}/crds/* ${TRAEFIK_TMP_CRD}/templates
  rm -rf ${TRAEFIK_TMP_CHART}/crds

  # Package charts
  OPTS="--format=gnu --sort=name --owner=0 --group=0 --mode=gou-s --numeric-owner --no-acls --no-selinux --no-xattrs"
  tar ${OPTS} --mtime='2021-01-01 00:00:00Z' -cf - -C ${TMP_DIR} $(basename ${TRAEFIK_TMP_CHART}) | gzip -n > ${CHARTS_DIR}/${TRAEFIK_FILE}
  tar ${OPTS} --mtime='2021-01-01 00:00:00Z' -cf - -C ${TMP_DIR} $(basename ${TRAEFIK_TMP_CRD}) | gzip -n > ${CHARTS_DIR}/${TRAEFIK_CRD_FILE}
  for TAR in ${CHARTS_DIR}/${TRAEFIK_FILE} ${CHARTS_DIR}/${TRAEFIK_CRD_FILE}; do
    sha256sum ${TAR}
    stat ${TAR}
    tar -vtf ${TAR}
  done
}

setup_tmp
download_and_package_traefik

cp scripts/wg-add.sh bin/aux/