#!/usr/bin/env bash
# -----------------------------------------------------------------------
# Copyright 2018-2023 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.
#
# github-release.sh
# builds (with make) and uploads release artifacts (binaries, etc.) to github
# given a tag also create checksums files and release notes from the commit
# message
# -----------------------------------------------------------------------
# 1) Staging to replace command github-release with gh.
# 2) gh auth / GIT_TOKEN handling may be needed
# -----------------------------------------------------------------------
# gh release create abc/1.2.3-rc2 --discussion-category "Announcements" --generate-notes hello.txt
# https://github.com/cli/cli/issues/4993
# -----------------------------------------------------------------------

##-------------------##
##---]  GLOBALS  [---##
##-------------------##
set -euo pipefail

declare -g scratch              # temp workspace for downloads
declare -g gh_cmd               # path to gh command

declare -g ARGV="$*"            # archive for display
declare -g SCRIPT_VERSION='1.0' # git changeset needed
declare -g TRACE=0              # uncomment to set -x

declare -g RELEASE_TEMP

##--------------------##
##---]  INCLUDES  [---##
##--------------------#
# shellcheck disable=SC1091
# source "${pgmdir}/common/common.sh" "${common_args[@]}"

## -----------------------------------------------------------------------
## Intent: Cleanup scratch area on exit
## -----------------------------------------------------------------------
function sigtrap()
{
    ## Prevent mishaps
    local is_read_only
    is_read_only="$(declare -p scratch)"
    if [[ $is_read_only != *"declare -r scratch="* ]]; then
	echo "ERROR: variable scratch is not read-only, cleanup skipped"
	exit 1
    fi

    if [ -d "$scratch" ]; then
	/bin/rm -fr "$scratch"
    fi

    return
}
trap sigtrap EXIT

## -----------------------------------------------------------------------
## Intent: Create a scratch area for downloads and transient tools
## -----------------------------------------------------------------------
function init()
{
    declare -g scratch

    local pkgbase="${0##*/}" # basename
    local pkgname="${pkgbase%.*}"

    scratch="$(mktemp -d -t "${pkgname}.XXXXXXXXXX")"
    readonly scratch 
   return
}

## -----------------------------------------------------------------------
## Intent: Output a log banner to identify the running script/version.
## -----------------------------------------------------------------------
## TODO:
##   o SCRIPT_VERSION => git changeset for repo:ci-managment
##   o echo "library version: ${env."library.libName.version"}"
# -----------------------------------------------------------------------
# 14:18:38   > git fetch --no-tags --progress -- https://gerrit.opencord.org/ci-management.git +refs/heads/*:refs/remotes/origin/* # timeout=10
# 14:18:39  Checking out Revision 50f6e0b97f449b32d32ec0e02d59642000351847 (master)
# -----------------------------------------------------------------------
function banner()
{
    local iam="${0##*/}"

cat <<EOH

** -----------------------------------------------------------------------
** IAM: ${iam} :: ${FUNCNAME[0]}
** ARGV: ${ARGV}
** PWD: $(/bin/pwd)
** NOW: $(date '+%Y/%m/%d %H:%M:%S')
** VER: ${SCRIPT_VERSION:-'unknown'}
** -----------------------------------------------------------------------
EOH

    return
}

## -----------------------------------------------------------------------
## Intent:
##   Display available command versions
##   A github release job is failing due to a command being mia.
## -----------------------------------------------------------------------
function displayCommands()
{
    # which git || /bin/true
    # git --version || /bin/true
    # go version    || /bin/true
    # helm version  || /bin/true
    return
}

## -----------------------------------------------------------------------
## Intent: Display filesystem with a banner for logging
## -----------------------------------------------------------------------
function displayPwd()
{
    local iam="${0##*/}"
    echo "** ${iam}: ENTER"

cat <<EOM

** -----------------------------------------------------------------------
** IAM: $iam :: ${FUNCNAME[0]}
** PWD: $(/bin/pwd)
** -----------------------------------------------------------------------
EOM
    find . -maxdepth 1 -ls
    echo "** ${iam}: LEAVE"
    return
}

## -----------------------------------------------------------------------
## Intent: Copy files from the build directory into the release staging directory.
## -----------------------------------------------------------------------
function copyToRelease()
{
    local iam="${FUNCNAME[0]}"
    echo "** ${iam}: ENTER"
 
    local artifact_glob="${ARTIFACT_GLOB%/*}"
    echo "** ${iam}: $(declare -p ARTIFACT_GLOB) $(declare -p artifact_glob)"

    # Copy artifacts into the release temp dir
    # shellcheck disable=SC2086
    # cp -v "$ARTIFACT_GLOB" "$RELEASE_TEMP"
    echo "rsync -rv --checksum \"$artifact_glob/.\" \"$RELEASE_TEMP/.\""
    rsync -rv --checksum "$artifact_glob/." "$RELEASE_TEMP/."

    echo "** ${iam}: RELEASE_TEMP=${RELEASE_TEMP}"
    find "$RELEASE_TEMP" -print

    echo "** ${iam}: LEAVE"
    echo
    return
}

## -----------------------------------------------------------------------
## Intent: 
## -----------------------------------------------------------------------
function github_release_pre()
{
    local what="$1"    ; shift
    local user="$1"    ; shift
    local repo="$1"    ; shift
    local tag="$1"     ; shift
    local name="$1"    ; shift
    local descr="$1"   ; shift

    local iam="${FUNCNAME[0]}"
    echo "** ${iam}: ENTER"

    case "$what" in
	gh)
	    declare -a cmd=()

	    ## [TODO] Refactor into a function accepting:
	    ##   --create
	    ##   --info
	    ##   --upload
	    cmd+=("$gh_cmd")
	    # cmd+=('--verbose')
	    cmd+=('release' 'create')	
	    # cmd+=('--latest')
	    cmd+=('--repo' "$repo")
	    cmd+=('--title'  "$name")
	    # cmd+=('--descripton'  "$descr") # not supported
	    cmd+=('--discussion-category' "Announcements")
	    # cmd+=('--latest') - auto based on date & ver
	    cmd+=('--verify-tag')

	    # --branch exists, omit switch for tag
	    cmd+=("$tag")

	    echo "** ${iam}: RUNNING " "${cmd[@]}"
	    "${cmd[@]}"
	    ;;

	*)
	    declare -a cmd=()

	    cmd+=('github-release')
	    # cmd+=('--verbose')
	    cmd+=('release')
	    cmd+=('--user' "$user")
	    cmd+=('--repo' "$repo")
	    cmd+=('--tag'  "$tag")
	    cmd+=('--name'  "$name")
	    cmd+=('--descripton'  "$descr")

	    echo "** ${iam}: RUNNING " "${cmd[@]}"
	    "${cmd[@]}"
	    ;;
    esac

    echo "** ${iam}: ENTER"
    return
}

## -----------------------------------------------------------------------
## Intent:
## -----------------------------------------------------------------------
function install_gh_binary()
{
    local iam="${FUNCNAME[0]}"
    echo "** $iam: ENTER"

    pushd "$scratch"
    echo -e "\n** ${iam}: Retrieve latest gh download URLs"

    local latest="https://github.com/cli/cli/releases/latest"
    local tarball="gh.tar.tgz" 
   
    local VER
    VER=$(curl --silent -qI "$latest" \
	      | awk -F '/' '/^location/ {print  substr($NF, 1, length($NF)-1)}')
    # echo "VER=[$VER]"
 
    echo "** ${iam}: Download latest gh binary"
    local url="https://github.com/cli/cli/releases/download/${VER}/gh_${VER#v}_linux_amd64.tar.gz"
    wget --quiet --output-document="$tarball" "$url"
    
    echo "** ${iam}: Unpack tarball"
    tar zxf "$tarball"

    gh_cmd="$(find "${scratch}" -name 'gh' -print)"
    readonly gh_cmd

    echo "** ${iam} Command: ${gh_cmd}"
    echo "** ${iam} Version: $("$gh_cmd" --version)"
    popd

    echo "** $iam: LEAVE"
    return
}

##----------------##
##---]  MAIN  [---##
##----------------##
iam="${0##*/}"

banner
init
install_gh_binary

echo "==========================================================================="
set
echo "==========================================================================="


# when not running under Jenkins, use current dir as workspace and a blank
# project name
WORKSPACE=${WORKSPACE:-.}
GERRIT_PROJECT=${GERRIT_PROJECT:-}

# Github organization (or user) this project is published on.  Project name should
# be the same on both Gerrit and GitHub
GITHUB_ORGANIZATION=${GITHUB_ORGANIZATION:-}

# glob pattern relative to project dir matching release artifacts
# ARTIFACT_GLOB=${ARTIFACT_GLOB:-"release/*"} # stat -- release/* not found, literal string (?)
ARTIFACT_GLOB=${ARTIFACT_GLOB:-"release/."}

# Temporary staging directory to copy artifacts to
RELEASE_TEMP="$WORKSPACE/release"
mkdir -p "$RELEASE_TEMP"

# Use "release" as the default makefile target, can be a space separated list
RELEASE_TARGETS=${RELEASE_TARGETS:-release}


# check that we're on a semver released version, or exit
pushd "$GERRIT_PROJECT"
  GIT_VERSION=$(git tag -l --points-at HEAD)

  # match bare versions or v-prefixed golang style version
  if [[ "$GIT_VERSION" =~ ^v?([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]
  then
    echo "git has a SemVer released version tag: '$GIT_VERSION'"
    echo "Building artifacts for GitHub release."
  else
    echo "No SemVer released version tag found, exiting..."
    exit 0
  fi
popd

# Set and handle GOPATH and PATH
export GOPATH=${GOPATH:-$WORKSPACE/go}
export PATH=$PATH:/usr/lib/go-1.12/bin:/usr/local/go/bin:$GOPATH/bin

# To support golang projects that require GOPATH to be set and code checked out there
# If $DEST_GOPATH is not an empty string:
# - create GOPATH within WORKSPACE, and destination directory within
# - set PATH to include $GOPATH/bin and the system go binaries
# - move project from $WORKSPACE/$GERRIT_PROJECT to new location in $GOPATH
# - start release process within that directory

DEST_GOPATH=${DEST_GOPATH:-}
if [ -n "$DEST_GOPATH" ]; then
  mkdir -p "$GOPATH/src/$DEST_GOPATH"
  release_path="$GOPATH/src/$DEST_GOPATH/$GERRIT_PROJECT"
  mv "$WORKSPACE/$GERRIT_PROJECT" "$release_path"
else
  release_path="$WORKSPACE/$GERRIT_PROJECT"
fi

if [ ! -f "$release_path/Makefile" ]; then
  echo "Makefile not found at $release_path!"
  exit 1
else

  # shellcheck disable=SC2015
  [[ -v TRACE ]] && { set -x; } || { set +x; } # SC2015 (shellcheck -x)

  pushd "$release_path"

  # Release description is sanitized version of the log message
  RELEASE_DESCRIPTION="$(git log -1 --pretty=%B | tr -dc "[:alnum:]\n\r\.\[\]\:\-\\\/\`\' ")"

  # build the release, can be multiple space separated targets
  # shellcheck disable=SC2086
  make "$RELEASE_TARGETS"

  # doDebug # deterine why ARTIFACT_GLOB is empty
  copyToRelease

  cat <<EOM

** -----------------------------------------------------------------------
** Create the release:
**  1) Create initial github release with download area.
**  2) Generate checksum.SHA256 for all released files.
**  3) Upload files to complete the release.
**  4) Display released info from github.
** -----------------------------------------------------------------------
EOM

#   git auth login 
#   git auth logout
  
  # Usage: github-release [global options] <verb> [verb options]
  # create release
  echo "** ${iam} Creating Release: $GERRIT_PROJECT - $GIT_VERSION"
  github_release_pre 'gh'\
		     "$GITHUB_ORGANIZATION"\
		     "$GERRIT_PROJECT"\
		     "$GIT_VERSION"\
		     "$GERRIT_PROJECT - $GIT_VERSION"\
		     "$RELEASE_DESCRIPTION"

  echo "** ${iam} Packaging release files"
  pushd "$RELEASE_TEMP"

    echo "** ${iam}: Files to release:"
    readarray -t to_release < <(find . -mindepth 1 -maxdepth 1 -type f -print)
    declare -p to_release

    # Generate and check checksums
    sha256sum -- * > checksum.SHA256
    sha256sum -c < checksum.SHA256

    echo
    echo "** ${iam} Checksums(checksum.SHA256):"
    cat checksum.SHA256
    echo

    echo "** ${iam} Upload files being released"

    # shellcheck disable=SC2194
    case 'gh' in
	gh)
	    declare -a cmd=()
	    cmd+=("$gh_cmd")
	    cmd+=('release' 'upload')
	    cmd+=('--repo' "$GERRIT_PROJECT")
	    cmd+=("${to_release[@]}")
	    "${cmd[@]}"
	    ;;

	*)

	    # upload all files to the release
	    for rel_file in *
	    do
		echo "** ${iam} Uploading file: $rel_file"
		github-release \
		    upload \
		    --user "$GITHUB_ORGANIZATION" \
		    --repo "$GERRIT_PROJECT" \
		    --tag  "$GIT_VERSION" \
		    --name "$rel_file" \
		    --file "$rel_file"
	    done
	    ;;
    esac

  popd
  popd
fi

# [SEE ALSO]
# -----------------------------------------------------------------------
# https://www.shellcheck.net/wiki/SC2236
# https://docs.github.com/en/rest/releases/releases?apiVersion=2022-11-28#create-a-release
# -----------------------------------------------------------------------
# https://cli.github.com/manual/gh_help_reference
# https://cli.github.com/manual/gh_release
# -----------------------------------------------------------------------

# [EOF]