/*
  This file is part of Ingen.
  Copyright 2007-2012 David Robillard <http://drobilla.net/>

  Ingen is free software: you can redistribute it and/or modify it under the
  terms of the GNU Affero General Public License as published by the Free
  Software Foundation, either version 3 of the License, or any later version.

  Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  A PARTICULAR PURPOSE.  See the GNU Affero General Public License for details.

  You should have received a copy of the GNU Affero General Public License
  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <string>

#include "raul/log.hpp"

#include "ingen/shared/URIs.hpp"

#include "ClientBroadcaster.hpp"
#include "Driver.hpp"
#include "Engine.hpp"
#include "EventQueue.hpp"
#include "EventWriter.hpp"
#include "events.hpp"

#define LOG(s) s << "[EventWriter] "

using namespace std;
using namespace Raul;

namespace Ingen {
namespace Server {

EventWriter::EventWriter(Engine& engine, EventSink& sink)
	: _request_client(NULL)
	, _sink(sink)
	, _request_id(-1)
	, _engine(engine)
	, _in_bundle(false)
{
}

EventWriter::~EventWriter()
{
}

SampleCount
EventWriter::now() const
{
	// Exactly one cycle latency (some could run ASAP if we get lucky, but not always, and a slight
	// constant latency is far better than jittery lower (average) latency
	if (_engine.driver())
		return _engine.driver()->frame_time() + _engine.driver()->block_length();
	else
		return 0;
}

void
EventWriter::set_response_id(int32_t id)
{
	if (!_request_client) {  // Kludge
		_request_client = _engine.broadcaster()->client(
			"http://drobilla.net/ns/ingen#internal");
	}
	_request_id = id;
}

/* *** ServerInterface implementation below here *** */

// Bundle commands

void
EventWriter::bundle_begin()
{
	_in_bundle = true;
}

void
EventWriter::bundle_end()
{
	_in_bundle = false;
}

// Object commands

void
EventWriter::put(const URI&                  uri,
                 const Resource::Properties& properties,
                 const Resource::Graph       ctx)
{
	_sink.event(new Events::SetMetadata(_engine, _request_client, _request_id, now(), true, ctx, uri, properties));
}

void
EventWriter::delta(const URI&                  uri,
                   const Resource::Properties& remove,
                   const Resource::Properties& add)
{
	_sink.event(new Events::SetMetadata(_engine, _request_client, _request_id, now(), false, Resource::DEFAULT, uri, add, remove));
}

void
EventWriter::move(const Path& old_path,
                  const Path& new_path)
{
	_sink.event(new Events::Move(_engine, _request_client, _request_id, now(), old_path, new_path));
}

void
EventWriter::del(const URI& uri)
{
	if (uri == "ingen:engine") {
		if (_request_client) {
			_request_client->response(_request_id, SUCCESS);
		}
		_engine.quit();
	} else {
		_sink.event(new Events::Delete(_engine, _request_client, _request_id, now(), uri));
	}
}

void
EventWriter::connect(const Path& tail_path,
                     const Path& head_path)
{
	_sink.event(new Events::Connect(_engine, _request_client, _request_id, now(), tail_path, head_path));

}

void
EventWriter::disconnect(const Path& src,
                        const Path& dst)
{
	if (!Path::is_path(src) && !Path::is_path(dst)) {
		LOG(Raul::error) << "Bad disconnect request " << src
		                 << " => " << dst << std::endl;
		return;
	}

	_sink.event(new Events::Disconnect(_engine, _request_client, _request_id, now(),
	                                   Path(src.str()), Path(dst.str())));
}

void
EventWriter::disconnect_all(const Path& patch_path,
                            const Path& path)
{
	_sink.event(new Events::DisconnectAll(_engine, _request_client, _request_id, now(), patch_path, path));
}

void
EventWriter::set_property(const URI&  uri,
                          const URI&  predicate,
                          const Atom& value)
{
	if (uri == "ingen:engine" && predicate == "ingen:enabled"
	    && value.type() == _engine.world()->forge().Bool) {
		if (value.get_bool()) {
			_engine.activate();
			_sink.event(new Events::Ping(_engine, _request_client, _request_id, now()));
		} else {
			_sink.event(new Events::Deactivate(_engine, _request_client, _request_id, now()));
		}
	} else {
		Resource::Properties remove;
		remove.insert(make_pair(predicate, _engine.world()->uris()->wildcard));
		Resource::Properties add;
		add.insert(make_pair(predicate, value));
		_sink.event(new Events::SetMetadata(
			            _engine, _request_client, _request_id, now(), false, Resource::DEFAULT,
			            uri, add, remove));
	}
}

// Requests //

void
EventWriter::get(const URI& uri)
{
	_sink.event(new Events::Get(_engine, _request_client, _request_id, now(), uri));
}

} // namespace Server
} // namespace Ingen