%%%-------------------------------------------------------------------
%%% @author Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% @copyright (C) 2016, Evgeny Khramtsov
%%% @doc
%%%
%%% @end
%%% Created : 14 Apr 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%-------------------------------------------------------------------
-module(mod_privacy_riak).

-behaviour(mod_privacy).

%% API
-export([init/2, process_lists_get/2, process_list_get/3,
	 process_default_set/3, process_active_set/3,
	 remove_privacy_list/3, set_privacy_list/1,
	 set_privacy_list/4, get_user_list/2, get_user_lists/2,
	 remove_user/2, import/2]).

-export([privacy_schema/0]).

-include("jlib.hrl").
-include("mod_privacy.hrl").

%%%===================================================================
%%% API
%%%===================================================================
init(_Host, _Opts) ->
    ok.

process_lists_get(LUser, LServer) ->
    case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
        {ok, #privacy{default = Default, lists = Lists}} ->
            LItems = lists:map(fun ({N, _}) ->
                                       #xmlel{name = <<"list">>,
                                              attrs = [{<<"name">>, N}],
                                              children = []}
                               end,
                               Lists),
            {Default, LItems};
        {error, notfound} ->
            {none, []};
        {error, _} ->
            error
    end.

process_list_get(LUser, LServer, Name) ->
    case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
        {ok, #privacy{lists = Lists}} ->
            case lists:keysearch(Name, 1, Lists) of
                {value, {_, List}} -> List;
                _ -> not_found
            end;
        {error, notfound} ->
            not_found;
        {error, _} ->
            error
    end.

process_default_set(LUser, LServer, {value, Name}) ->
    {atomic,
     case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
         {ok, #privacy{lists = Lists} = P} ->
             case lists:keymember(Name, 1, Lists) of
                 true ->
                     ejabberd_riak:put(P#privacy{default = Name,
                                                 lists = Lists},
				       privacy_schema());
                 false ->
                     not_found
             end;
         {error, _} ->
             not_found
     end};
process_default_set(LUser, LServer, false) ->
    {atomic,
     case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
         {ok, R} ->
             ejabberd_riak:put(R#privacy{default = none}, privacy_schema());
         {error, _} ->
             ok
     end}.

process_active_set(LUser, LServer, Name) ->
    case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
        {ok, #privacy{lists = Lists}} ->
            case lists:keysearch(Name, 1, Lists) of
                {value, {_, List}} -> List;
                false -> error
            end;
        {error, _} ->
            error
    end.

remove_privacy_list(LUser, LServer, Name) ->
    {atomic,
     case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
         {ok, #privacy{default = Default, lists = Lists} = P} ->
             if Name == Default ->
                     conflict;
                true ->
                     NewLists = lists:keydelete(Name, 1, Lists),
                     ejabberd_riak:put(P#privacy{lists = NewLists},
				       privacy_schema())
             end;
         {error, _} ->
             ok
     end}.

set_privacy_list(Privacy) ->
    ejabberd_riak:put(Privacy, privacy_schema()).

set_privacy_list(LUser, LServer, Name, List) ->
    {atomic,
     case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
         {ok, #privacy{lists = Lists} = P} ->
             NewLists1 = lists:keydelete(Name, 1, Lists),
             NewLists = [{Name, List} | NewLists1],
             ejabberd_riak:put(P#privacy{lists = NewLists}, privacy_schema());
         {error, _} ->
             NewLists = [{Name, List}],
             ejabberd_riak:put(#privacy{us = {LUser, LServer},
                                        lists = NewLists},
			       privacy_schema())
     end}.

get_user_list(LUser, LServer) ->
    case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
        {ok, #privacy{default = Default, lists = Lists}} ->
            case Default of
                none -> {none, []};
                _ ->
                    case lists:keysearch(Default, 1, Lists) of
                        {value, {_, List}} -> {Default, List};
                        _ -> {none, []}
                    end
            end;
        {error, _} ->
            {none, []}
    end.

get_user_lists(LUser, LServer) ->
    case ejabberd_riak:get(privacy, privacy_schema(), {LUser, LServer}) of
        {ok, #privacy{} = P} ->
            {ok, P};
        {error, _} ->
            error
    end.

remove_user(LUser, LServer) ->
    {atomic, ejabberd_riak:delete(privacy, {LUser, LServer})}.

import(_LServer, #privacy{} = P) ->
    ejabberd_riak:put(P, privacy_schema()).

%%%===================================================================
%%% Internal functions
%%%===================================================================
privacy_schema() ->
    {record_info(fields, privacy), #privacy{}}.