# Bash completion for Timewarrior
#
# Copyright (C) 2017 - 2020, 2023, Thomas Lauf
#
function __get_commands()
{
  echo "annotate cancel config continue day delete diagnostics export extensions gaps get help join lengthen modify month move report resize retag shorten show split start stop summary tag tags track undo untag week"
}

function __get_subcommands()
{
  case "${1}" in
    modify)
      echo -e "end start"
      ;;
    *)
      echo ""
      ;;
  esac
}

function __get_help_items()
{
  echo -e "$( __get_commands ) interval hints date duration dom"
}

function __get_options()
{
  echo -e "--help --verbose --version"
}

function __get_ids()
{
  local count
  count="$( timew get dom.tracked.count )"
  if [[ "${count}" -eq "0" ]] ; then
    echo ""
  else
    seq -f "@%g" 1 "${count}"
  fi
}

function __get_tags()
{
  tags=$(timew get dom.tracked.tags "${TIMEW_COMPLETION_TAGS_RANGE:-":all"}")
  # return each tag on its own line
  while [[ "${tags}" ]]; do
    if [[ "${tags}" =~ ^\"[^\"]*\" ]]; then
      tag="${BASH_REMATCH[0]:1:-1}"
      tags="${tags#\"${tag}\"}"
    else
      tag="${tags%% *}"
      tags="${tags#$tag}"
    fi
    echo "${tag}"
    tags="${tags# }"
  done
}

function __get_extensions()
{
  timew extensions | awk '{if(NR>6)print $1}'
}

function __has_entered_id()
{
  for word in "${COMP_WORDS[@]}" ; do
    if [[ "${word}" =~ ^@[0-9] ]] ; then
      return 0
    fi
  done

  return 1
}

function __has_entered_subcommand()
{
  local subcommands
  subcommands=$( __get_subcommands "${1}" )

  for word in "${COMP_WORDS[@]}" ; do
    for cmd in ${subcommands} ; do
      if [[ "${word}" == "${cmd}" ]] ; then
        return 0
      fi
    done
  done

  return 1
}

function __has_entered_help_item()
{
  local items
  items=$( __get_help_items )

  for word in "${COMP_WORDS[@]:2}" ; do
    for item in ${items} ; do
      if [[ "${word}" == "${item}" ]] ; then
        return 0
      fi
    done
  done

  return 1
}

function __is_entering_id()
{
  if [[ "${COMP_WORDS[COMP_CWORD]}" =~ @[0-9]* ]] ; then
    return 0
  else
    return 1
  fi
}

function __complete_tag()
{
  COMPREPLY=()
  cur="${COMP_WORDS[COMP_CWORD]}"
  local line wordlist

  declare -a wordlist
  while IFS=$'\n' read -r line ; do
    wordlist+=( "${line}" )
  done <<< "$( __get_tags )"

  declare -a completions
  while read -r line ; do
    completions+=( "${line}" )
  done < <( compgen -W "$(printf '%q ' "${wordlist[@]}")" -- "${cur}" 2>/dev/null )

  for completion in "${completions[@]}" ; do
    COMPREPLY+=( "$(printf "%q" "${completion}")" )
  done
}

function _timew()
{
  local cur first wordlist

  COMPREPLY=()
  cur="${COMP_WORDS[COMP_CWORD]}"
  first="${COMP_WORDS[1]}"

  case "${first}" in
    cancel|config|diagnostics|day|extensions|get|month|show|undo|week)
      wordlist=""
      ;;
    annotate|continue|delete|join|lengthen|move|resize|shorten|split)
      wordlist=$( __get_ids )
      ;;
    export|gaps|start|stop|summary|tags|track)
      __complete_tag
      return
      ;;
    modify)
      if __has_entered_subcommand "${first}" ; then
        wordlist=$( __get_ids )
      else
        wordlist=$( __get_subcommands "${first}" )
      fi
      ;;
    tag|untag)
      if __is_entering_id ; then
        wordlist=$( __get_ids )
      elif __has_entered_id ; then
        __complete_tag
        return
      else
        wordlist=$( __get_ids )
      fi
      ;;
    report)
      wordlist=$( __get_extensions )
      ;;
    help)
      if __has_entered_help_item ; then
        wordlist=""
      else
        wordlist=$( __get_help_items )
      fi
      ;;
    -*)
      wordlist=$( __get_options )
      ;;
    *)
      wordlist=$( __get_commands )
      ;;
  esac

  COMPREPLY=( $( compgen -W "${wordlist}" -- "${cur}" ) )
}

complete -F _timew timew
