#!/usr/bin/env bash
#
# init the git bare repo
#
# @params
# Globals
#   ${mydir}: current dir of the script
#   ${confirm}: confirm status of the user
#   ${post_hooks}: post checkout actions to perform
# Arguments
#   -h: show help message and exit
#   -u: specify remote dotfiles url to init
#   -s: clone submodules after checkout
#   -y: confirm action by default and skip confirmation

set -e
set -f

mydir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source "${mydir}"/../helper/set_variable.sh
source "${mydir}"/../helper/get_confirmation.sh

function usage() {
  echo -e "Usage: dotbare finit [-h] [-y] [-s] [-u URL] ...\n"
  echo -e "Init the git bare repository if doesn't exist"
  # shellcheck disable=SC2016
  echo -e 'The bare repository will be initialised under $DOTBARE_DIR, default to $HOME/.cfg if not set'
  # shellcheck disable=SC2016
  echo -e 'It will track $DOTBARE_TREE, default to $HOME if not set\n'
  echo -e "Default: init the bare repository at $DOTBARE_DIR\n"
  echo -e "optional arguments:"
  echo -e "  -h\t\tshow this help message and exit"
  echo -e "  -u URL\tmigrate existing dotfiles from the git URL to current system"
  echo -e "  -s\t\tclone submodules after checkout"
  echo -e "  -y\t\tconfirm action by default and skip confirmation"
}

remote_url=""
post_hooks=()
while getopts ":hu:ys" opt; do
  case "$opt" in
    s)
      [[ ! "${post_hooks[*]}" =~ submodule ]] && \
        post_hooks+=("submodule")
      ;;
    u)
      remote_url="${OPTARG}"
      ;;
    y)
      confirm='y'
      ;;
    h)
      usage
      exit 0
      ;;
    *)
      echo "Invalid option: ${OPTARG}" >&2
      usage
      exit 1
      ;;
  esac
done

if [[ -z "${remote_url}" ]]; then
  echo "modify DOTBARE_DIR and DOTBARE_TREE to customize location, more information run dotbare finit -h"
  echo "git bare repository will be initialised at ${DOTBARE_DIR}"
  echo "git bare repository will be tracking ${DOTBARE_TREE}"
  [[ -z "${confirm}" ]] && confirm=$(get_confirmation)
  [[ "${confirm}" != 'y' ]] && exit 1

  if [[ -d "${DOTBARE_DIR}" ]]; then
    echo "${DOTBARE_DIR} already exist"
    exit 1
  else
    git init --bare "${DOTBARE_DIR}"
    /usr/bin/git --git-dir "${DOTBARE_DIR}" --work-tree "${DOTBARE_TREE}" \
      config --local status.showUntrackedFiles no
  fi
else
  [[ ! -d "${DOTBARE_TREE}" ]] && mkdir -p "${DOTBARE_TREE}"
  cd "${DOTBARE_TREE}"
  git clone --bare "${remote_url}" "${DOTBARE_DIR}"
  if ! /usr/bin/git --git-dir "${DOTBARE_DIR}" --work-tree "${DOTBARE_TREE}" checkout 2> /dev/null; then
    echo "File checkout failed"
    echo "Backing up pre-existing dotfiles ..."
    /usr/bin/git --git-dir "${DOTBARE_DIR}" --work-tree "${DOTBARE_TREE}" checkout 2>&1 \
      | awk '{
          if ($0 ~ /[\t].*/) {
            gsub(/^[\t]/, "", $0)
            print $0
          }
        }' \
      | xargs -I __ "${mydir}"/fbackup -p __ -m
    echo "dotfiles backup succeeded, checkout continue"
    /usr/bin/git --git-dir "${DOTBARE_DIR}" --work-tree "${DOTBARE_TREE}" checkout
  fi
  /usr/bin/git --git-dir "${DOTBARE_DIR}" --work-tree "${DOTBARE_TREE}" \
    config --local status.showUntrackedFiles no
  echo "File checkout succeeded"

  for hook in "${post_hooks[@]}"; do
    case "${hook}" in
      submodule)
        echo "Cloning submodules ..."
        /usr/bin/git --git-dir "${DOTBARE_DIR}" --work-tree "${DOTBARE_TREE}" \
          submodule update --init --recursive
        ;;
    esac
  done

  echo "Migration completed"
  exit 0
fi