/*
    Copyright (C) 2008 Hans Baier

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id$
*/

#include <sigc++/sigc++.h>
#include <boost/shared_ptr.hpp>

#include "pbd/compose.h"
#include "pbd/file_utils.h"
#include "pbd/error.h"

#include "ardour/session.h"
#include "ardour/session_directory.h"
#include "ardour/midi_patch_manager.h"

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace MIDI;
using namespace MIDI::Name;
using namespace PBD;
using namespace PBD::sys;

MidiPatchManager* MidiPatchManager::_manager = 0;

void
MidiPatchManager::set_session (Session& s)
{
	_session = &s;
	_session->GoingAway.connect (sigc::mem_fun (*this, &MidiPatchManager::drop_session));

	refresh();
}

void
MidiPatchManager::refresh()
{
	_documents.clear();
	_master_devices_by_model.clear();
	_all_models.clear();

	path path_to_patches = _session->session_directory().midi_patch_path();

	if (!exists(path_to_patches)) {
		return;
	}

	assert(is_directory(path_to_patches));

	Glib::PatternSpec pattern(Glib::ustring("*.midnam"));
	vector<path> result;

	find_matching_files_in_directory(path_to_patches, pattern, result);

	info << "Loading " << result.size() << " MIDI patches from " << path_to_patches.to_string() << endl;

	for (vector<path>::iterator i = result.begin(); i != result.end(); ++i) {
		boost::shared_ptr<MIDINameDocument> document(new MIDINameDocument(i->to_string()));
		for (MIDINameDocument::MasterDeviceNamesList::const_iterator device =
					document->master_device_names_by_model().begin();
				device != document->master_device_names_by_model().end();
				++device) {
			//cerr << "got model " << device->first << endl;
			// have access to the documents by model name
			_documents[device->first] = document;
			// build a list of all master devices from all documents
			_master_devices_by_model[device->first] = device->second;
			_all_models.push_back(device->first);

			// make sure there are no double model names
			// TODO: handle this gracefully.
			assert(_documents.count(device->first) == 1);
			assert(_master_devices_by_model.count(device->first) == 1);
		}
	}
}

void
MidiPatchManager::drop_session ()
{
	_session = 0;
	_documents.clear();
	_master_devices_by_model.clear();
	_all_models.clear();
}