#!/bin/sh

main() {
  if [ $# -lt 1 ]; then
    usage
  fi

  DO_CMD=$1
  shift 1
  WD=$(pwd)

  case $DO_CMD in

    git_sparse_checkout)
      git_sparse_checkout $@
      ;;

    user_git_pull)
      user_git_pull $@
      ;;

    *)
      usage
      ;;

  esac
}

# ----------- End Of Main Switch / Start Of Modular Code -----------

usage() {

  cat<<ENDOFUSAGE

  Subcommands:
  - git_sparse_checkout
  - user_git_pull

ENDOFUSAGE

exit 1
}

git_sparse_checkout() {

  if [ "$#" -lt 3 ]; then
    echo "Usage: git_sparse_checkout <git-remote> <private-key> <local-path> <repo-path-0> [<repo-path-N>]"
  fi

  exit 0

  rurl="$1"
  privkey="$(realpath $2)"
  localdir="$3"
  shift 3

  export GIT_SSH_COMMAND="ssh -i ${privkey} -o IdentitiesOnly=yes"

  sudo mkdir -p "$localdir"
  sudo chown $USER "$localdir"
  cd "$localdir"

  git init
  git remote add -f origin "$rurl"

  git config core.sparseCheckout true

  # Loops over remaining args
  for i; do
    echo "$i" >> .git/info/sparse-checkout
  done

  git pull origin main

  exit $?
}

user_git_pull() {

  if [ "$#" -lt 4 ]; then
    echo "Usage: user_git_pull <user> <folder> <privkey> <repo>"
  fi

  user="$1"
  folder="$2"
  privkey="$3"
  repo="$4"
  shift 4

  export GIT_SSH_COMMAND="ssh -i ${privkey} -o IdentitiesOnly=yes"

  sudo mkdir -p ${folder}
  sudo chown ${user} ${folder}
  sudo -u ${user} git clone ${repo} ${folder}

  exit $?
}


main $@