%%% ====================================================================
%%% ``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_pep_odbc).
-behaviour(gen_pubsub_node).
-author('christophe.romain@process-one.net').

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

%%% @doc The module <strong>{@module}</strong> is the pep PubSub plugin.
%%% <p>PubSub plugin nodes are using the {@link gen_pubsub_node} behaviour.</p>

-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,
    get_entity_subscriptions_for_send_last/2, get_last_items/3]).

init(Host, ServerHost, Opts) ->
    node_flat_odbc:init(Host, ServerHost, Opts),
    complain_if_modcaps_disabled(ServerHost),
    ok.

terminate(Host, ServerHost) ->
    node_flat_odbc:terminate(Host, ServerHost),
    ok.

options() ->
    [{odbc, true}, {rsm, true} | node_pep:options()].

features() ->
    [<<"rsm">> | node_pep:features()].

create_node_permission(Host, ServerHost, Node, ParentNode, Owner, Access) ->
    node_pep:create_node_permission(Host, ServerHost, Node, ParentNode, Owner, Access).

create_node(Nidx, Owner) ->
    node_flat_odbc:create_node(Nidx, Owner),
    {result, {default, broadcast}}.

delete_node(Nodes) ->
    {result, {_, _, Result}} = node_flat_odbc:delete_node(Nodes),
    {result, {[], Result}}.

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


unsubscribe_node(Nidx, Sender, Subscriber, SubId) ->
    case node_flat_odbc:unsubscribe_node(Nidx, Sender, Subscriber, SubId) of
	{error, Error} -> {error, Error};
	{result, _} -> {result, []}
    end.

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

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

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

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

get_entity_affiliations(_Host, Owner) ->
    OwnerKey = jlib:jid_tolower(jlib:jid_remove_resource(Owner)),
    node_flat_odbc:get_entity_affiliations(OwnerKey, Owner).

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

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

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

get_entity_subscriptions(_Host, Owner) ->
    SubKey = jlib:jid_tolower(Owner),
    GenKey = jlib:jid_remove_resource(SubKey),
    Host = node_flat_odbc:encode_host(element(2, SubKey)),
    SJ = node_flat_odbc:encode_jid(SubKey),
    GJ = node_flat_odbc:encode_jid(GenKey),
    Query = case SubKey of
	GenKey ->
	    [<<"select host, node, type, i.nodeid, jid, "
		    "subscriptions from pubsub_state i, pubsub_node n "
		    "where i.nodeid = n.nodeid and jid "
		    "like '">>, GJ, <<"%' and host like '%@">>, Host, <<"';">>];
	_ ->
	    [<<"select host, node, type, i.nodeid, jid, "
		    "subscriptions from pubsub_state i, pubsub_node n "
		    "where i.nodeid = n.nodeid and jid "
		    "in ('">>, SJ, <<"', '">>, GJ, <<"') and host like '%@">>, Host, <<"';">>]
    end,
    Reply = case catch ejabberd_odbc:sql_query_t(Query) of
	{selected,
		    [<<"host">>, <<"node">>, <<"type">>, <<"nodeid">>, <<"jid">>, <<"subscriptions">>],
		    RItems} ->
	    lists:map(fun ([H, N, T, I, J, S]) ->
			O = node_flat_odbc:decode_jid(H),
			Node = nodetree_tree_odbc:raw_to_node(O, [N, <<"">>, T, I]),
			{Node,
			    node_flat_odbc:decode_subscriptions(S),
			    node_flat_odbc:decode_jid(J)}
		end,
		RItems);
	_ ->
	    []
    end,
    {result, Reply}.

get_entity_subscriptions_for_send_last(_Host, Owner) ->
    SubKey = jlib:jid_tolower(Owner),
    GenKey = jlib:jid_remove_resource(SubKey),
    Host = node_flat_odbc:encode_host(element(2, SubKey)),
    SJ = node_flat_odbc:encode_jid(SubKey),
    GJ = node_flat_odbc:encode_jid(GenKey),
    Query = case SubKey of
	GenKey ->
	    [<<"select host, node, type, i.nodeid, jid, "
		    "subscriptions from pubsub_state i, pubsub_node n, "
		    "pubsub_node_option o where i.nodeid = n.nodeid "
		    "and n.nodeid = o.nodeid and name='send_last_published_item' and "
		    "val='on_sub_and_presence' and jid like '">>,
		GJ, <<"%' and host like '%@">>, Host, <<"';">>];
	_ ->
	    [<<"select host, node, type, i.nodeid, jid, "
		    "subscriptions from pubsub_state i, pubsub_node n, "
		    "pubsub_node_option o where i.nodeid = n.nodeid "
		    "and n.nodeid = o.nodeid and name='send_last_published_item' and "
		    "val='on_sub_and_presence' and jid in ",
		    "('">>, SJ, <<"', '">>, GJ, <<"') and host like '%@">>, Host, <<"';">>]
    end,
    Reply = case catch ejabberd_odbc:sql_query_t(Query) of
	{selected,
		    [<<"host">>, <<"node">>, <<"type">>, <<"nodeid">>, <<"jid">>, <<"subscriptions">>],
		    RItems} ->
	    lists:map(fun ([H, N, T, I, J, S]) ->
			O = node_flat_odbc:decode_jid(H),
			Node = nodetree_tree_odbc:raw_to_node(O, [N, <<"">>, T, I]),
			{Node,
			    node_flat_odbc:decode_subscriptions(S),
			    node_flat_odbc:decode_jid(J)}
		end,
		RItems);
	_ ->
	    []
    end,
    {result, Reply}.

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

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

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

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

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

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

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

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

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

get_last_items(Nidx, JID, Count) ->
    node_flat_odbc:get_last_items(Nidx, JID, Count).

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

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

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

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

node_to_path(Node) ->
    node_flat_odbc:node_to_path(Node).

path_to_node(Path) ->
    node_flat_odbc:path_to_node(Path).

%%%
%%% Internal
%%%

%% @doc Check mod_caps is enabled, otherwise show warning.
%% The PEP plugin for mod_pubsub requires mod_caps to be enabled in the host.
%% Check that the mod_caps module is enabled in that Jabber Host
%% If not, show a warning message in the ejabberd log file.
complain_if_modcaps_disabled(ServerHost) ->
    case gen_mod:is_loaded(ServerHost, mod_caps) of
	false ->
	    ?WARNING_MSG("The PEP plugin is enabled in mod_pubsub "
		"of host ~p. This plugin requires mod_caps "
		"to be enabled, but it isn't.",
		[ServerHost]);
	true -> ok
    end.