# test if git completion is missing, but loader exists, attempt to load
if ! declare -F _git >/dev/null && ! declare -F __git_wrap__git_main >/dev/null; then
  if declare -F _completion_loader >/dev/null; then
    _completion_loader git
  fi
fi

# only operate if git completion is present
if declare -F _git >/dev/null || declare -F __git_wrap__git_main >/dev/null; then

  _yadm() {

    local current=${COMP_WORDS[COMP_CWORD]}
    local penultimate
    if ((COMP_CWORD >= 1)); then
      penultimate=${COMP_WORDS[COMP_CWORD - 1]}
    fi
    local antepenultimate
    if ((COMP_CWORD >= 2)); then
      antepenultimate=${COMP_WORDS[COMP_CWORD - 2]}
    fi

    local -x GIT_DIR
    GIT_DIR="$(yadm introspect repo 2>/dev/null)"

    case "$penultimate" in
      bootstrap)
        COMPREPLY=()
        return 0
        ;;
      config)
        COMPREPLY=($(compgen -W "$(yadm introspect configs 2>/dev/null)"))
        return 0
        ;;
      decrypt)
        COMPREPLY=($(compgen -W "-l" -- "$current"))
        return 0
        ;;
      init)
        COMPREPLY=($(compgen -W "-f -w" -- "$current"))
        return 0
        ;;
      introspect)
        COMPREPLY=($(compgen -W "commands configs repo switches" -- "$current"))
        return 0
        ;;
      help)
        COMPREPLY=() # no specific help yet
        return 0
        ;;
      list)
        COMPREPLY=($(compgen -W "-a" -- "$current"))
        return 0
        ;;
    esac

    case "$antepenultimate" in
      clone)
        COMPREPLY=($(compgen -W "-f -w -b --bootstrap --no-bootstrap" -- "$current"))
        return 0
        ;;
    esac

    local yadm_switches=($(yadm introspect switches 2>/dev/null))

    # this condition is so files are completed properly for --yadm-xxx options
    if [[ " ${yadm_switches[*]} " != *" $penultimate "* ]]; then
      # TODO: somehow solve the problem with [--yadm-xxx option] being
      #       incompatible with what git expects, namely [--arg=option]
      if declare -F _git >/dev/null; then
        _git
      else
        __git_wrap__git_main
      fi
    fi
    if [[ "$current" =~ ^- ]]; then
      __gitcompappend "${yadm_switches[*]}" "" "$current" " "
    fi

    # Find the index of where the sub-command argument should go.
    local command_idx
    for ((command_idx = 1; command_idx < ${#COMP_WORDS[@]}; command_idx++)); do
      local command_idx_arg="${COMP_WORDS[$command_idx]}"
      if [[ " ${yadm_switches[*]} " = *" $command_idx_arg "* ]]; then
        let command_idx++
      elif [[ "$command_idx_arg" = -* ]]; then
        :
      else
        break
      fi
    done
    if [[ "$COMP_CWORD" = "$command_idx" ]]; then
      __gitcompappend "$(yadm introspect commands 2>/dev/null)" "" "$current" " "
    fi
  }

  complete -o bashdefault -o default -o nospace -F _yadm yadm 2>/dev/null ||
    complete -o default -o nospace -F _yadm yadm

fi