#!/bin/bash



go_install () {



local latest_url="https://go.dev/VERSION?m=text"

## START INSTALL
module_load  host-utils

PLATFORM=$(get_platform)
if [ -z "$PLATFORM" ]; then
    echo "Your operating system is not supported by this install script."
    return 1
fi

local goroot
local force

declare OPTION
declare OPTARG
declare OPTIND

while getopts 'fr:' OPTION; do
    # echo $OPTION $OPTARG
  case "$OPTION" in
    f)
     force=true
    ;;
    r)
      goroot=$OPTARG
      ;;
    *)
      echo unknown option $OPTION
      ;;
  esac
done

shift $(( OPTIND - 1 ))

if [[ $GOROOT ]]; then
  goroot=$GOROOT
 else 
 [[ ! $goroot ]] && goroot="$HOME/.go"  
fi

[[ $GOPATH ]] && gopath=$GOROOT || gopath=$goroot/apps

goenv=(
"\n"
 "# ======= GO LANGUAGE ENVIRONMENT ===========\n" 
'export GOROOT='"$goroot"'\n'
'export PATH=$PATH:'"$goroot"'/bin\n'
'export GOPATH='"$gopath"'\n'
'export PATH=$PATH:'"$gopath"'/bin\n'
"# ======= GO LANGUAGE ENVIRONMENT ==========="
"\n")

module_load confirm

echo go install and environment will be
printf "${goenv[*]}\n"
confirm Do you want to continue || return 1

VERSION=$(curl -s $latest_url | sed 's/^go//')
if [[ $(which go) ]]; then
  INSTALLED_VERSION=$(echo $(go version)| awk '{print $3}' | cut -c 3-)
  # INSTALLED_VERSION=1.15.2 # this is for testing upgrade, comment out for production
  echo installed: $INSTALLED_VERSION available: $VERSION
  if [ "$INSTALLED_VERSION" == "$VERSION" ]; then
    if [[ ! $force ]]; then 
    echo Installed Version $INSTALLED_VERSION is current nothing to do, exiting
    echo use -r flag to force reinstall
    return 2
    fi
  fi
  confirm Do you want to upgrade || return 1
fi

echo installing version $VERSION ......

PACKAGE_NAME="go$VERSION.$PLATFORM.tar.gz"
TEMP_DIRECTORY=$(mktemp -d)
URL=https://go.dev/dl/go$VERSION.$PLATFORM.tar.gz 

echo "Downloading $URL ..."
if which wget 2>/dev/null; then
    wget $URL -O "$TEMP_DIRECTORY/go.tar.gz"
else
    curl -o "$TEMP_DIRECTORY/go.tar.gz" $URL
fi

if [ $? -ne 0 ]; then
    echo "Download failed! Exiting."
    return 1
fi

echo "Extracting File..."
if ! mkdir -p "$goroot"; then
echo unable to make directory $goroot with current user $user; aborting
return 3
fi

tar -C "$goroot" --strip-components=1 -xzf "$TEMP_DIRECTORY/go.tar.gz"

echo done installing go binary and support files
rm -rf $TEMP_DIRECTORY
echo making go workspace directories
mkdir -p "${gopath}/"{src,pkg,bin}
# TODO set correct permission if all have access

echo "Setting up GO environment..."

if [[ -d $BASH_SHELL_HOST ]] && [[ ! $goroot == "$HOME/.go" ]]; then 
  echo saving environment to $BASH_SHELL_HOST/load/go.env
  # confirm Do you want to continue || return 1
  printf "${goenv[*]}\n" > $BASH_SHELL_HOST/load/go.env
else 
 if [[ -d $BASH_SHELL_USER_DIR ]] && [[ $goroot == "$HOME/.go" ]]; then 
    echo saving environment to $BASH_SHELL_USER_DIR/load/go.env
    # confirm Do you want to continue || return 1
    printf "${goenv[*]}\n" > $BASH_SHELL_USER_DIR/load/go.env
   else
    echo appending environment block to $HOME/.bashrc
    # confirm Do you want to continue || return 1
    printf "${goenv[*]}\n" >> $HOME/.bashrc
    cat $HOME/.bashrc
  fi
fi

echo -e "\nGo $VERSION was installed into $goroot.\n(re)start a new shell for environment to take effect"
return 0

}

# go_uninstall () {

# }

# go_upgrade () {

# }


(return 0 2>/dev/null) || go_install $@