#!/usr/bin/env bash
set -eo pipefail
[[ $TRACE ]] && set -x

readonly TMP_WORK_DIR="$(mktemp -d "/tmp/dokku-plugin-release.XXXXXX")"

trap "rm -rf '$TMP_WORK_DIR' >/dev/null" RETURN INT TERM EXIT

log-info() {
  declare desc="Log info formatter"
  echo "$*"
}

log-error() {
  declare desc="Log error formatter"
  echo "!   $*" 1>&2
}

log-fail() {
  declare desc="Log fail formatter"
  log-error "$*"
  exit 1
}

fn-github-download-release() {
  declare REPO_NAME="$1" VERSION="$2"

  if [[ -n "$DOKKU_PLUGIN_GITHUB_ACCESS_TOKEN" ]]; then
    curl -L "https://api.github.com/repos/${REPO_NAME}/tarball/${VERSION}?access_token=${DOKKU_PLUGIN_GITHUB_ACCESS_TOKEN}"
  else
    curl -L "https://api.github.com/repos/${REPO_NAME}/tarball/${VERSION}"
  fi
}

fn-replace-version() {
  declare desc="Replaces the version within a file"
  local CURRENT_VERSION="$1"
  local NEXT_VERSION="$2"
  local FILENAME="$3"
  sed -i.bak "s/${CURRENT_VERSION//./\.}/$NEXT_VERSION/g" "$FILENAME" && rm "$FILENAME.bak"
  git add "$FILENAME"
}

fn-require-bin() {
  declare desc="Checks that a binary exists"
  declare BINARY="$1"
  if ! command -v "$BINARY" &>/dev/null; then
    log-fail "Missing ${BINARY}, please install it"
  fi
}

main() {
  local RELEASE="$1" AWS_RELEASE="$2"
  local CURRENT_VERSION FILENAME NEXT_VERSION ORG_REPO_NAME REPO_NAME major minor patch

  if [[ -z "$RELEASE" ]]; then
    cat <<'EOF'
requirements:

- this is run in a plugin folder
- a `plugin.toml` exists
- the plugin is versioned via git

usage:

    # the following commands make these assumptions
    # - the plugin's folder name is dokku-example, as is the remote repository
    # - the current version is `0.0.1` in the `plugin.toml`

    # create the alias
    alias release-dokku-plugin="path/to/dokku/contrib/release-plugin"

    # make a specific kind of release
    release-dokku-plugin patch # creates a 0.0.2 release
    release-dokku-plugin minor # creates a 0.1.0 release
    release-dokku-plugin major # creates a 1.0.0 release

    # release private plugins as tarballs to S3
    # note that the plugin *must* exist on github for this to work
    export DOKKU_PLUGIN_GITHUB_ACCESS_TOKEN="some-github-token"
    export DOKKU_PLUGIN_S3_BUCKET="example"
    export DOKKU_PLUGIN_S3_PATH="some/path"
    # will upload the versioned tarball url to s3://example/some/path/dokku-plugin-name-0.0.1.tar.gz
    release-dokku-plugin patch
EOF
    return
  fi

  fn-require-bin "git"

  if [[ "$AWS_RELEASE" != "true" ]] && [[ "$AWS_RELEASE" != "false" ]]; then
    local AWS_RELEASE=true
  fi

  if [[ "$AWS_RELEASE" == "true" ]] && [[ -z "$DOKKU_PLUGIN_GITHUB_ACCESS_TOKEN" ]]; then
    log-info "You are running this without a DOKKU_PLUGIN_GITHUB_ACCESS_TOKEN environment variable."
    log-info "Doing so disables uploading releases to S3, which may be necessary for installing private plugins."
    while true; do
      read -rp "Do you wish to continue? " yn
      case $yn in
        [Yy]*) break ;;
        [Nn]*) exit ;;
        *) echo "Please answer yes or no." ;;
      esac
    done
  fi

  if [[ "$AWS_RELEASE" == "true" ]]; then
    fn-require-bin "aws"
    fn-require-bin "curl"
    if [[ -z "$DOKKU_PLUGIN_S3_BUCKET" ]]; then
      log-fail "No DOKKU_PLUGIN_S3_BUCKET environment variable set"
    fi
    if [[ -z "$DOKKU_PLUGIN_S3_PATH" ]]; then
      log-fail "No DOKKU_PLUGIN_S3_PATH environment variable set"
    fi
  fi

  if [[ ! -f plugin.toml ]]; then
    log-error "No plugin.toml found"
    return 1
  fi

  if [[ ! -d .git ]]; then
    log-error "No git repository found"
    return 1
  fi

  CURRENT_VERSION=$(grep version plugin.toml | cut -d '"' -f2)
  major=$(echo "$CURRENT_VERSION" | awk '{split($0,a,"."); print a[1]}')
  minor=$(echo "$CURRENT_VERSION" | awk '{split($0,a,"."); print a[2]}')
  patch=$(echo "$CURRENT_VERSION" | awk '{split($0,a,"."); print a[3]}')

  if [[ "$RELEASE" == "major" ]]; then
    major=$((major + 1))
    minor="0"
    patch="0"
  elif [[ "$RELEASE" == "minor" ]]; then
    minor=$((minor + 1))
    patch="0"
  elif [[ "$RELEASE" == "patch" ]]; then
    patch=$((patch + 1))
  else
    log-error "Invalid release type specified"
    return 1
  fi
  NEXT_VERSION="${major}.${minor}.${patch}"

  fn-replace-version "$CURRENT_VERSION" "$NEXT_VERSION" plugin.toml
  git add plugin.toml
  git commit -m "Release ${NEXT_VERSION}"
  git tag "${NEXT_VERSION}"
  git push --tags origin master
  git fetch

  ORG_REPO_NAME="$(git remote -v | grep origin | HEAD -n1 | cut -d':' -f2 | cut -d'.' -f1)"
  REPO_NAME="$(echo "$ORG_REPO_NAME" | cut -d'/' -f2)"
  FILENAME="${REPO_NAME}-${NEXT_VERSION}.tar.gz"

  if [[ "$AWS_RELEASE" == "true" ]]; then
    DOKKU_PLUGIN_S3_BUCKET="${DOKKU_PLUGIN_S3_BUCKET%/}"
    DOKKU_PLUGIN_S3_PATH="${DOKKU_PLUGIN_S3_PATH%/}"
    if [[ "$DOKKU_PLUGIN_S3_PATH" != "/" ]]; then
      DOKKU_PLUGIN_S3_PATH="${DOKKU_PLUGIN_S3_PATH}/"
    fi

    fn-github-download-release "$ORG_REPO_NAME" "$NEXT_VERSION" >"${TMP_WORK_DIR}/${FILENAME}"
    aws s3 cp "${TMP_WORK_DIR}/${FILENAME}" "s3://${DOKKU_PLUGIN_S3_BUCKET}/${DOKKU_PLUGIN_S3_PATH}${FILENAME}" --acl public-read
  fi
}

main "$@"