# shellcheck shell=bash

# Check for bash
[ -z "$BASH_VERSION" ] && return

####################################################################################################

__gsettings() {
  local choices coffset schemadir=""

  if [ "${COMP_CWORD}" -gt 2 ]; then
      if [ "${COMP_WORDS[1]}" = --schemadir ]; then
	  # this complexity is needed to perform correct tilde expansion
	  schemadir=$(eval "echo --schemadir ${COMP_WORDS[2]}")
	  coffset=2
      else
	  coffset=0
      fi
  else
      coffset=0
  fi

  case "$((COMP_CWORD-coffset))" in
    1)
      choices=$'--schemadir\n--version\nhelp \nlist-schemas\nlist-relocatable-schemas\nlist-keys \nlist-children \nlist-recursively \nget \nrange \nset \nreset \nreset-recursively \nwritable \nmonitor \ndescribe '
      ;;

    2)
      case "${COMP_WORDS[$((coffset+1))]}" in
	--schemadir)
	  COMPREPLY=($(compgen -o dirnames -- "${COMP_WORDS[${COMP_CWORD}]}"))
	  return 0
	  ;;

        help)
          choices=$'list-schemas\nlist-relocatable-schemas\nlist-keys\nlist-children\nlist-recursively\nget\nrange\nset\nreset\nreset-recursively\nwritable\nmonitor'
          ;;
        list-keys|list-children|list-recursively|reset-recursively)
          choices="$(gsettings "$schemadir" list-schemas 2> /dev/null)"$'\n'"$(gsettings "$schemadir" list-relocatable-schemas 2> /dev/null | sed -e 's.$.:/.')"
          ;;
        list-schemas)
          COMPREPLY=($(compgen -W "--print-paths" -- "${COMP_WORDS[${COMP_CWORD}]}"))
          return 0
          ;;

        get|range|set|reset|writable|monitor|describe)
          choices="$(gsettings "$schemadir" list-schemas 2> /dev/null | sed -e 's.$. .')"$'\n'"$(gsettings "$schemadir" list-relocatable-schemas 2> /dev/null | sed -e 's.$.:/.')"
          ;;
      esac
      ;;

    3)
      case "${COMP_WORDS[$((coffset+1))]}" in
        set)
          choices="$(gsettings "$schemadir" list-keys "${COMP_WORDS[$((coffset+2))]}" 2> /dev/null | sed -e 's.$. .')"
          ;;

        get|range|reset|writable|monitor|describe)
          choices="$(gsettings "$schemadir" list-keys "${COMP_WORDS[$((coffset+2))]}" 2> /dev/null)"
          ;;
      esac
      ;;

    4)
      case "${COMP_WORDS[$((coffset+2))]}" in
        set)
          range=($(gsettings "$schemadir" range "${COMP_WORDS[$((coffset+2))]}" "${COMP_WORDS[$((coffset+3))]}" 2> /dev/null))
          case "${range[0]}" in
            enum)
              unset range[0]
             ;;
            *)
              unset range
             ;;
          esac
          local IFS=$'\n'
          choices="${range[*]}"
          ;;
      esac
      ;;
  esac

  local IFS=$'\n'
  COMPREPLY=($(compgen -W "${choices}" -- "${COMP_WORDS[${COMP_CWORD}]}"))
}

####################################################################################################

complete -o nospace -F __gsettings gsettings