#!/usr/bin/env bash

REQUIRED_CONFIGS+=("APP")
REQUIRED_CONFIGS+=("BUILD_HOST")
REQUIRED_CONFIGS+=("BUILD_USER")
REQUIRED_CONFIGS+=("BUILD_AT")
OPTIONAL_CONFIGS+=("FROM")
OPTIONAL_CONFIGS+=("WITH")
OPTIONAL_CONFIGS+=("TO")
OPTIONAL_CONFIGS+=("REBAR_CONFIG")

TO="${TO:=$(get_latest_commit)}"

set_build_hosts

run() {
  authorize_hosts
  authorize_release_store_on_build_host
  if [[ -n "$WITH" ]]; then
    validate_release_is_in_store "release" $WITH # we can skip init_app_remotely and pushing to remote if release does not exist
    if [[ $? -ne 0 ]]; then
      hint_message "You can build appups also with the --from=<git-tag-or-revision> option\nif the release is not in your release store"; exit 2
    fi
    # push current state
    init_app_remotely
    git_push
    git_reset_remote
    git_clean_remote
  elif [[ -n "$FROM" ]]; then
    # push current state
    init_app_remotely
    git_push
    git_reset_remote
    git_clean_remote
    # checkout old version
    git_checkout_remote $FROM
    # build old release
    erlang_get_and_update_deps
    erlang_clean_compile
    erlang_generate_release
    rename_release_add_version
    OLD_RELEASE_VERSION=$RELEASE_VERSION
  else
    error_message "no old version specified"; exit 2
  fi

  # checkout new version
  git_checkout_remote $TO
  # build new release
  erlang_get_and_update_deps
  erlang_clean_compile
  erlang_generate_release

  if [[ -n "$WITH" ]]; then
    __detect_remote_release_dir
    # backup new release
    rename_release_add_version "new"
    NEW_RELEASE_VERSION=$RELEASE_VERSION;
    OLD_RELEASE_VERSION="$WITH"
    # upload and extract old release
    upload_release_archive "$(dirname $RELEASE_DIR)" "${APP}_${WITH}.release.tar.gz" "$WITH"
    remote_extract_release_archive "$WITH" "$(dirname $RELEASE_DIR)"
    # rename old release
    rename_release_add_version "old" "$WITH"
    # restore new release
    rename_release_remove_version $NEW_RELEASE_VERSION
  fi

  # genrate and copy appups
  rebar_generate_appup $OLD_RELEASE_VERSION
  copy_appups_to_release_store $OLD_RELEASE_VERSION
}