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#compdef qdbus
#
# Copyright (C) 2015 Thomas Mitterfellner <thomas.mitterfellner@gmail.com>
#
# This file is released under the GPLv2.
#
#  version 0.1

# get the type of a method: 1 means function, 2 means property
getType () {
  case "$1" in
    "method"*) echo 1 ;;
    "property"*) echo 2 ;;
    *) echo 0 ;;
  esac
}

# get the index of a method in an array of methods
getIndex () {
  local e
  local index
  local type_
  index=0
  for e in "${@:2}"; do 
    index=$(( index + 1 ))
    type_=$(getType "$e")
    if [[ $type_ == 1 ]] ; then
      if [[ "$e" == *"$1("* ]] ; then
        echo $index
        return 0
      fi
    elif [[ $type_ == 2 ]] ; then
      if [[ "$e" == *"$1" ]] ; then
        echo $index
        return 0
      fi
    fi
  done
  echo 0
}

_qdbus() {
  local curcontext="$curcontext" state line
  local services
  local path_
  local methods
  local names
  local types
  local properties
  local index
  typeset -A opt_args
 
  _arguments "--system[connect to system bus]"\
             "--literal[print literal replies]"\
             "1:service name:->service"\
             "2:path:->path"\
             "3:method:->method"\
             "*:arguments:->arguments"
  
  case $state in 
    service)
      services=( $(qdbus ${words[@]:1:-1} | grep -E '^([^:])') )
      compadd "$@" $services
    ;;

    path)
      path_=( $(qdbus ${words[@]:1:-1} 2>/dev/null) )
      
      compadd "$@" $path_
    ;;

    method)
      IFS=$'\n' 
      methods=( $(qdbus ${words[@]:1:-1} | \
          grep -e "^method" | \
          sed -r 's/method (.+) (.+)\((.*)\)/\2:\1(\3)/g' 2>/dev/null) )
      properties=( $(qdbus ${words[@]:1:-1} | \
          grep -e "^property" | \
          sed -r 's/property (.+) (.+) (.+)/\3:\1 \2/g' 2>/dev/null) )

      _describe properties properties -J properties
      _describe methods methods -J methods
    ;;

    arguments)
      IFS=$'\n' 
     
      path_pos=$(( ${(M)#words:#--*} + 2))
      method_pos=$(( $path_pos + 2))
      names=( $(qdbus ${words[@]:1:$path_pos} | grep -e '^[mp]' 2>/dev/null) )
      index=$(getIndex "${words[$method_pos]}" $names[@])
      method=$names[$index]

      arg_pos=$(( ${#words} - $method_pos ))
      if [[ $(getType "$method") -eq 1 ]] ; then
        method_args="$(echo $method | sed -r 's/(.+) (.+) (.+)\((.*)\)/\4/g')"
        IFS=$',' method_args_=(${=method_args})
        num_args=${#method_args_}
        if [[ $arg_pos -le $num_args ]] ; then
          _message "${method_args_[$arg_pos]}"
        fi
      else
        property_=$(echo "$method" |\
            sed -r 's/property (.+) (.+) (.+)/\1 \2/g')
        if [[ $arg_pos -eq 1 ]] ; then 

          _message ${property_}
        fi
      fi
    ;;
  esac
}

_qdbus "$@"