#!/bin/bash
#
# Purpose : coredesktop-dev deployed: show the deployed copy of CoreDesktop
#           (~/.local/share/coredesktop), or put back its tracked files so
#           update can pull again

deployed_usage() {
  cat << EOF
Usage: coredesktop-dev deployed [status|restore]

  status    Branch, commit, how far behind upstream, and local changes (default)
  restore   Undo local changes to tracked files, after asking. Untracked files
            are listed and left alone.
EOF
}

cmd_deployed() {
  case "${1:-status}" in
    -h | --help) deployed_usage; return 0 ;;
    status | restore) ;;
    *) deployed_usage >&2; return 1 ;;
  esac
  git -C "$COREDESKTOP" rev-parse --git-dir &> /dev/null \
    || die "CoreDesktop isn't installed in $COREDESKTOP."

  "deployed_${1:-status}"
}

deployed_status() {
  local behind changes
  echo "Deployed copy: $COREDESKTOP"
  echo "Branch:        $(git -C "$COREDESKTOP" rev-parse --abbrev-ref HEAD)"
  echo "Commit:        $(git -C "$COREDESKTOP" log -1 --format='%cd (%h) %s' --date=format:%Y.%m.%d)"

  if GIT_TERMINAL_PROMPT=0 timeout 30 git -C "$COREDESKTOP" fetch --quiet &> /dev/null \
      && behind="$(git -C "$COREDESKTOP" rev-list --count 'HEAD..@{upstream}' 2> /dev/null)"; then
    echo "Behind:        $behind commits (update pulls them)"
  else
    echo "Behind:        unknown (couldn't reach upstream)"
  fi

  changes="$(git -C "$COREDESKTOP" status --porcelain --untracked-files=no)"
  if [ -z "$changes" ]; then
    echo "Changes:       none"
  else
    echo "Changes:       these stop update from pulling (coredesktop-dev deployed restore):"
    echo "$changes" | sed 's/^/  /'
  fi
}

deployed_restore() {
  local untracked
  if [ -z "$(git -C "$COREDESKTOP" status --porcelain --untracked-files=no)" ]; then
    echo "The deployed copy has no local changes."
    return 0
  fi

  git -C "$COREDESKTOP" diff HEAD --stat
  untracked="$(git -C "$COREDESKTOP" ls-files --others --exclude-standard)"
  if [ -n "$untracked" ]; then
    echo
    echo "Untracked files, which are left alone:"
    echo "$untracked" | sed 's/^/  /'
  fi
  echo

  if ! confirm "Undo the changes above in $COREDESKTOP?"; then
    echo "Nothing changed."
    return 1
  fi
  git -C "$COREDESKTOP" checkout HEAD -- . || return 1

  if [ -n "$(git -C "$COREDESKTOP" status --porcelain --untracked-files=no)" ]; then
    echo "Restored, but some changes remain (new files added to git's index?):"
    git -C "$COREDESKTOP" status --short --untracked-files=no
    return 1
  fi
  echo "Restored. update can pull again."
}