%%% ====================================================================
%%% ``The contents of this file are subject to the Erlang Public License,
%%% Version 1.1, (the "License"); you may not use this file except in
%%% compliance with the License. You should have received a copy of the
%%% Erlang Public License along with this software. If not, it can be
%%% retrieved via the world wide web at http://www.erlang.org/.
%%%
%%%
%%% Software distributed under the License is distributed on an "AS IS"
%%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%%% the License for the specific language governing rights and limitations
%%% under the License.
%%%
%%%
%%% The Initial Developer of the Original Code is ProcessOne.
%%% Portions created by ProcessOne are Copyright 2006-2015, ProcessOne
%%% All Rights Reserved.''
%%% This software is copyright 2006-2015, ProcessOne.
%%%
%%% @copyright 2006-2015 ProcessOne
%%% @author Christophe Romain <christophe.romain@process-one.net>
%%%   [http://www.process-one.net/]
%%% @version {@vsn}, {@date} {@time}
%%% @end
%%% ====================================================================

-module(node_flat).
-behaviour(gen_pubsub_node).
-author('christophe.romain@process-one.net').

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

-export([init/3, terminate/2, options/0, features/0,
    create_node_permission/6, create_node/2, delete_node/1,
    purge_node/2, subscribe_node/8, unsubscribe_node/4,
    publish_item/6, delete_item/4, remove_extra_items/3,
    get_entity_affiliations/2, get_node_affiliations/1,
    get_affiliation/2, set_affiliation/3,
    get_entity_subscriptions/2, get_node_subscriptions/1,
    get_subscriptions/2, set_subscriptions/4,
    get_pending_nodes/2, get_states/1, get_state/2,
    set_state/1, get_items/7, get_items/3, get_item/7,
    get_item/2, set_item/1, get_item_name/3, node_to_path/1,
    path_to_node/1]).

init(_Host, _ServerHost, _Opts) ->
    pubsub_subscription:init(),
    mnesia:create_table(pubsub_state,
	[{disc_copies, [node()]},
	    {type, ordered_set},
	    {attributes, record_info(fields, pubsub_state)}]),
    mnesia:create_table(pubsub_item,
	[{disc_only_copies, [node()]},
	    {attributes, record_info(fields, pubsub_item)}]),
    ItemsFields = record_info(fields, pubsub_item),
    case mnesia:table_info(pubsub_item, attributes) of
	ItemsFields -> ok;
	_ -> mnesia:transform_table(pubsub_item, ignore, ItemsFields)
    end,
    ok.

terminate(Host, ServerHost) ->
    node_hometree:terminate(Host, ServerHost).

options() ->
    node_hometree:options().

features() ->
    node_hometree:features().

%% use same code as node_hometree, but do not limite node to
%% the home/localhost/user/... hierarchy
%% any node is allowed
create_node_permission(Host, ServerHost, _Node, _ParentNode, Owner, Access) ->
    LOwner = jlib:jid_tolower(Owner),
    Allowed = case LOwner of
	{<<"">>, Host, <<"">>} ->
	    true; % pubsub service always allowed
	_ ->
	    acl:match_rule(ServerHost, Access, LOwner) =:= allow
    end,
    {result, Allowed}.

create_node(Nidx, Owner) ->
    node_hometree:create_node(Nidx, Owner).

delete_node(Removed) ->
    node_hometree:delete_node(Removed).

subscribe_node(Nidx, Sender, Subscriber, AccessModel,
	    SendLast, PresenceSubscription, RosterGroup, Options) ->
    node_hometree:subscribe_node(Nidx, Sender, Subscriber,
	AccessModel, SendLast, PresenceSubscription,
	RosterGroup, Options).

unsubscribe_node(Nidx, Sender, Subscriber, SubId) ->
    node_hometree:unsubscribe_node(Nidx, Sender, Subscriber, SubId).

publish_item(Nidx, Publisher, Model, MaxItems, ItemId, Payload) ->
    node_hometree:publish_item(Nidx, Publisher, Model, MaxItems, ItemId, Payload).

remove_extra_items(Nidx, MaxItems, ItemIds) ->
    node_hometree:remove_extra_items(Nidx, MaxItems, ItemIds).

delete_item(Nidx, Publisher, PublishModel, ItemId) ->
    node_hometree:delete_item(Nidx, Publisher, PublishModel, ItemId).

purge_node(Nidx, Owner) ->
    node_hometree:purge_node(Nidx, Owner).

get_entity_affiliations(Host, Owner) ->
    node_hometree:get_entity_affiliations(Host, Owner).

get_node_affiliations(Nidx) ->
    node_hometree:get_node_affiliations(Nidx).

get_affiliation(Nidx, Owner) ->
    node_hometree:get_affiliation(Nidx, Owner).

set_affiliation(Nidx, Owner, Affiliation) ->
    node_hometree:set_affiliation(Nidx, Owner, Affiliation).

get_entity_subscriptions(Host, Owner) ->
    node_hometree:get_entity_subscriptions(Host, Owner).

get_node_subscriptions(Nidx) ->
    node_hometree:get_node_subscriptions(Nidx).

get_subscriptions(Nidx, Owner) ->
    node_hometree:get_subscriptions(Nidx, Owner).

set_subscriptions(Nidx, Owner, Subscription, SubId) ->
    node_hometree:set_subscriptions(Nidx, Owner, Subscription, SubId).

get_pending_nodes(Host, Owner) ->
    node_hometree:get_pending_nodes(Host, Owner).

get_states(Nidx) ->
    node_hometree:get_states(Nidx).

get_state(Nidx, JID) ->
    node_hometree:get_state(Nidx, JID).

set_state(State) ->
    node_hometree:set_state(State).

get_items(Nidx, From, RSM) ->
    node_hometree:get_items(Nidx, From, RSM).

get_items(Nidx, JID, AccessModel, PresenceSubscription, RosterGroup, SubId, RSM) ->
    node_hometree:get_items(Nidx, JID, AccessModel,
	PresenceSubscription, RosterGroup, SubId, RSM).

get_item(Nidx, ItemId) ->
    node_hometree:get_item(Nidx, ItemId).

get_item(Nidx, ItemId, JID, AccessModel, PresenceSubscription, RosterGroup, SubId) ->
    node_hometree:get_item(Nidx, ItemId, JID, AccessModel,
	PresenceSubscription, RosterGroup, SubId).

set_item(Item) ->
    node_hometree:set_item(Item).

get_item_name(Host, Node, Id) ->
    node_hometree:get_item_name(Host, Node, Id).

node_to_path(Node) ->
    [(Node)].

path_to_node(Path) ->
    case Path of
	% default slot
	[Node] -> iolist_to_binary(Node);
	% handle old possible entries, used when migrating database content to new format
	[Node | _] when is_binary(Node) ->
	    iolist_to_binary(str:join([<<"">> | Path], <<"/">>));
	% default case (used by PEP for example)
	_ -> iolist_to_binary(Path)
    end.