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

trigger-docker-options-docker-args() {
  declare desc="docker args plugin trigger"
  declare trigger="$0"
  declare APP="$1" IMAGE_SOURCE_TYPE="$2"
  local STDIN=$(cat)

  case "$0" in
    *docker-args-build)
      local PHASE=BUILD
      ;;
    *docker-args-deploy)
      local PHASE=DEPLOY
      ;;
    *docker-args-run)
      local PHASE=RUN
      ;;
  esac

  local FILE_PREFIX="DOCKER_OPTIONS_"
  local PHASE_FILE_PATH="${DOKKU_ROOT}/${APP}/${FILE_PREFIX}${PHASE}"

  local output=""

  if [[ -f "$PHASE_FILE_PATH" ]]; then
    local DONE=false
    until $DONE; do
      local line
      read -r line || local DONE=true

      [[ -z "$line" ]] && continue

      case "$line" in
        \#*)
          continue
          ;;
        *)
          case "$IMAGE_SOURCE_TYPE" in
            dockerfile)
              case "$line" in
                --link* | -v* | --volume*)
                  continue
                  ;;

                *)
                  local output="$output $line"
                  ;;
              esac
              ;;

            herokuish)
              case "$line" in
                --file* | --build-args*)
                  continue
                  ;;

                *)
                  local output="$output $line"
                  ;;
              esac
              ;;

            *)
              local output="$output $line"
              ;;
          esac
          ;;
      esac
    done <"$PHASE_FILE_PATH"
  fi

  echo -n "$STDIN$output"
}

trigger-docker-options-docker-args "$@"
