#!/bin/bash
set -o errexit \
    -o nounset \
    -o pipefail

PKG_BIN_PATH="${1}"
PKG_OUT_PATH="${2}"

# Determine if "${CIRCLE_TAG}" matches the semantic version regex. Otherwise,
# assume that "${CIRCLE_TAG}" is not intended to tag a release. The regex is
# permissive of what occurs after the semantic version. This allows for
# alphas, betas, and release candidates.
if [[ "${CIRCLE_TAG:-}" =~ ^v[0-9]+.[0-9]+.[0-9]+ ]]
then
  VERSION="${CIRCLE_TAG/#v/}"
  RELEASE=1
else
  # When "${CIRCLE_TAG}" cannot be used to construct the package version,
  # use "${CIRCLE_SHA1}". Since "${CIRCLE_SHA1}" can start with an alpha
  # (non-numeric) character, prefix it with "2.x-".
  VERSION="2.x-${CIRCLE_SHA1:0:8}"
fi

build_archive()
{
  local workspace="$(mktemp -d)"

  cp LICENSE README.md "${PKG_BIN_PATH}" "${workspace}"

  pushd "${workspace}"

  if [[ ${OS} != windows ]]
  then
    local target="${PKG_OUT_PATH}/influxdb2-client-${VERSION}-${OS}-${ARCH}.tar.gz"

    tar -czf "${target}" .
  else
    local target="${PKG_OUT_PATH}/influxdb2-client-${VERSION}-${OS}-${ARCH}.zip"
    zip -r "${target}" .
  fi

  generate_checksums "${target}"

  popd
}

build_package_linux()
{
  local workspace="$(mktemp -d)"

  pushd "${workspace}"

  mkdir -p fs/usr/bin

  # copies binaries into package file system
  cp "${PKG_BIN_PATH}" fs/usr/bin

  fpm_wrapper deb
  fpm_wrapper rpm

  popd
}

fpm_wrapper()
{
  # "${ARCH}" matches Debian architecture names. Therefore, when building an
  # RPM, it needs to be converted into a Redhat architecture name. Currently,
  # influxdb-cli only supports "x86_64" and "aarch64".
  if [[ "${1}" == rpm ]]
  then
    case ${ARCH} in
      amd64)
        ARCH=x86_64
        ;;
      arm64)
        ARCH=aarch64
    esac
  fi

  fpm                                                            \
    --log error                                                  \
    `# package description`                                      \
    --name           influxdb2-cli                               \
    --vendor         InfluxData                                  \
    --description    'CLI for managing resources in InfluxDB v2' \
    --url            https://influxdata.com                      \
    --maintainer     support@influxdb.com                        \
    --license        MIT                                         \
    `# package configuration`                                    \
    --input-type     dir                                         \
    --output-type    "${1}"                                      \
    --architecture   "${ARCH}"                                   \
    --version        "${VERSION}"                                \
    --iteration      1                                           \
    `# package options`                                          \
    --chdir          fs/                                         \
    --package        "${PKG_OUT_PATH}/"

    # `goreleaser` removed the "package revision" from the package filename.
    # Since the automation is based on the packages created by `goreleaser`,
    # this will also remove the "package revision" to
    # maintain compatibility.
    case ${1} in
      deb)
        mv "${PKG_OUT_PATH}/influxdb2-cli_${VERSION}-1_${ARCH}.deb" \
           "${PKG_OUT_PATH}/influxdb2-client-${VERSION}-${ARCH}.deb"

        generate_checksums "${PKG_OUT_PATH}/influxdb2-client-${VERSION}-${ARCH}.deb"
        ;;
      rpm)
        mv "${PKG_OUT_PATH}/influxdb2-cli-${VERSION//-/_}-1.${ARCH}.rpm" \
           "${PKG_OUT_PATH}/influxdb2-client-${VERSION//-/_}.${ARCH}.rpm"

        generate_checksums "${PKG_OUT_PATH}/influxdb2-client-${VERSION//-/_}.${ARCH}.rpm"
        ;;
    esac
}

generate_checksums()
{
  md5sum    "${1}" >"${1}.md5"
  sha256sum "${1}" >"${1}.sha256"
}

case ${OS} in
  linux)
    build_archive
    build_package_linux
    ;;
  darwin)
    build_archive
    ;;
  windows)
    build_archive
    ;;
esac