#!/bin/bash
#
# backup all tracked files
#
# @params
# Globals
#   ${mydir}: current dir of the script
#   ${individual_file}: allow selection of files to backup
#   ${selected_files}: selected files to backup
#   ${action_command}: actions to run, cp|mv
# Arguments
#   -h: show help message and exit
#   -s: select individual files through fzf and backup
#   -p: pass in path and backup
#   -m: use mv to backup instead of cp

set -e
set -f

mydir="${0%/*}"
source "${mydir}"/../helper/set_variable.sh
source "${mydir}"/../helper/git_query.sh

function usage() {
  echo -e "Usage: dotbare fbackup [-h] ...\n"
  echo -e "Backup files to ${DOTBARE_BACKUP}"
  echo -e "This is useful when untracking files or migrating on new machines\n"
  echo -e "optional arguments:"
  echo -e "  -h\t\tshow this help message and exit"
  echo -e "  -s\t\tselect individual file through fzf and backup"
  echo -e "  -p PATH\tsepcify path to backup"
}

#######################################
# backup passed in files while preserving directory info
# Arguments:
#   $1: files to backup, seperate by \n
#   $2: action command (cp|mv)
#######################################
function dotbare_backup() {
  local selected_files="$1"
  local action_command="${2:-cp}"
  while IFS= read -r line; do
    dir_name=$(dirname "${line}")
    [[ ! -d "${DOTBARE_BACKUP}/${dir_name}" ]] && mkdir -p "${DOTBARE_BACKUP}/${dir_name}"
    command "${action_command}" -v "${line}" "${DOTBARE_BACKUP}/${line}"
  done <<< "${selected_files}"
  exit 0
}

individual_file=""
action_command='cp'
while getopts ":hsp:m" opt; do
  case "$opt" in
    s)
      individual_file='true'
      ;;
    p)
      selected_files="${OPTARG}"
      ;;
    m)
      action_command="mv"
      ;;
    h)
      usage
      exit 0
      ;;
    *)
      echo "Invalid option: ${OPTARG}" >&2
      usage
      exit 0
      ;;
  esac
done


[[ -n "${selected_files}" ]] && dotbare_backup "${selected_files}" "${action_command}"

cd "${DOTBARE_TREE}"
if [[ -n "${individual_file}" ]]; then
  selected_files=$(get_git_file "select files to backup" "raw")
else
  selected_files=$(/usr/bin/git --git-dir="${DOTBARE_DIR}" --work-tree="${DOTBARE_TREE}" \
    ls-files --full-name --directory "${DOTBARE_TREE}")
fi

dotbare_backup "${selected_files}" "${action_command}"