#!/bin/bash
# -*- makefile -*-
# -----------------------------------------------------------------------
# Copyright 2023 Open Networking Foundation (ONF) and the ONF Contributors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------
# SPDX-FileCopyrightText: 2023 Open Networking Foundation (ONF) and the ONF Contributors
# SPDX-License-Identifier: Apache-2.0
# -----------------------------------------------------------------------
## Intent: This script will update a repository makefiles/ directory
##   by creating a hierarchy that will allow using library makefiles
##   and per-repository makefiles.
## -----------------------------------------------------------------------

##-------------------##
##---]  GLOBALS  [---##
##-------------------##
set -euo pipefail
# declare -g -i debug=1

## -----------------------------------------------------------------------
## Intent: Display a message with formatting
## -----------------------------------------------------------------------
function banner()
{
    cat <<EOM

** -----------------------------------------------------------------------
** $*
** -----------------------------------------------------------------------
EOM
    return
}

## -----------------------------------------------------------------------
## Intent: Display an error mesage then exit with status
## -----------------------------------------------------------------------
function error()
{
    echo "ERROR: $*"
    exit 1
}

## -----------------------------------------------------------------------
## Intent: Archive current directory before we begin
## -----------------------------------------------------------------------
function archive_sandbox()
{
	local abs="$(realpath --canonicalize-existing '.')"
	local dir="${abs##*/}"
	local ts="$(date '+%Y%m%d%H%M%S')"
	local prefix="../${dir}-all/backups"

	banner "Archive current directory ($dir)"

#	make sterile >/dev/null # nuke lingering .venv/ installs
#	make clean-all >/dev/null # nuke lingering .venv/ installs

	declare -a targs=()
	targs+=('--create')

    ## Set archive compression level
	local compress='bzip2'
	local ext
	case "$compress" in
	  bzip2) targs+=('--bzip2'); ext='bz2' ;;
	  gzip) targs+=('--gzip'); ext='tgz' ;;
	  zstd) targs+=('--zstd'); ext='zst' ;;
	*) error "Detected invalid compression [$compress]" ;;
	esac

	local out="${prefix}/${ts}.${ext}"

	targs+=('--file' "$out")

	mkdir -p "$prefix"
	tar "${targs[@]}" '.'
	/bin/ls -l "$out"
	return
}	

## -----------------------------------------------------------------------
## Intent: Install feature enabling makefile.
## -----------------------------------------------------------------------
function install_config_mk
{
	local dst='makefiles/config.mk'
	if [[ -f "$dst" ]]; then
		:
	elif [[ -f 'config.mk' ]]; then
		git mv config.mk "$dst"
	else
		rsync -v --checksum makefiles/onf-lib/config.mk "$dst"
	fi

	return
}

## -----------------------------------------------------------------------
## Intent: Re-home existing local makefiles/ into makefiles/local
## -----------------------------------------------------------------------
function patch_detection()
{
	[[ ! -d makefiles ]] && return

    ## Migration patches should be simple and plentiful.
	if [[ ! -d makefiles-orig ]]; then
	    cat <<EOM

* -----------------------------------------------------------------------
* Replacing a repository makefile directory is deployed
* by creating a few independent patches.
* -----------------------------------------------------------------------
  1) Rename the repository-specific makefiles directory.
  1a) git mv makefiles makefiles-orig
  1b) Update Makefile to "include makefiles-orig"

  2) Create makefiles/
  2a) add repo:onf-make as a submodule.
  2b) create makefiles/local/
  2c) relocate config files

  3) Update Makefile to include makefiles/include.mk

EOM
		exit 1
	fi
	return
}

##----------------##
##---]  MAIN  [---##
##----------------##
while [[ $# -gt 0 ]]; do
	arg=$1; shift
	case "$arg" in
	  debug) declare -g -i debug=1 ;;
	  *) error "Detected invalid switch [$arg]" ;;
	esac
done

## Avoid trashing a work-in-progress
path='makefiles/local/include.mk'
[[ -e "$path" ]] && { error "Detected upgrade path: $path"; }

archive_sandbox
patch_detection

mkdir -p makefiles
pushd makefiles || { error 'pushd makefiles failed'; }

banner 'Adding repo:onf-make (library makefiles) as a submodule'
git submodule add 'https://github.com/opencord/onf-make.git' onf-lib

banner 'Install library/local loader include.mk'
rsync -v --checksum onf-lib/makefiles_include_mk.ex include.mk

banner 'Create project specific directory makefiles/local'
mkdir -p local
touch local/include.mk

popd || { error 'popd makefiles failed'; }

banner 'Prep work for pending checkin'
git add makefiles/include.mk
git add makefiles/local/include.mk
install_config_mk
git add makefiles
git status

# [EOF]