/*
    Copyright (C) 2006 Paul Davis 

    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.
*/

#include <cassert>
#include <iostream>

#include <ardour/midi_port.h>
#include <ardour/data_type.h>

using namespace ARDOUR;
using namespace std;

MidiPort::MidiPort(jack_port_t* p)
	: Port(p)
	, _buffer(4096) // FIXME FIXME FIXME Jack needs to tell us this
	, _nframes_this_cycle(0)
{
	DataType dt(_type);
	assert(dt == DataType::MIDI);

	reset();


}


MidiPort::~MidiPort()
{
}

void
MidiPort::cycle_start (nframes_t nframes)
{
	_buffer.clear();
	assert(_buffer.size() == 0);

	_nframes_this_cycle = nframes;

	if (_flags & JackPortIsOutput) {
		_buffer.silence(nframes);
		assert(_buffer.size() == 0);
		return;
	}

	// We're an input - copy Jack events to internal buffer
	
	void* jack_buffer = jack_port_get_buffer(_port, nframes);

	const nframes_t event_count
		= jack_midi_get_event_count(jack_buffer);

	assert(event_count < _buffer.capacity());

	jack_midi_event_t ev;

	for (nframes_t i=0; i < event_count; ++i) {

		jack_midi_event_get(&ev, jack_buffer, i);

		_buffer.push_back(ev);
	}

	assert(_buffer.size() == event_count);

	//if (_buffer.size() > 0)
	//	cerr << "MIDIPort got " << event_count << " events." << endl;
}

void
MidiPort::cycle_end()
{
	if (_flags & JackPortIsInput) {
		_nframes_this_cycle = 0;
		return;
	}

	// We're an output - copy events from internal buffer to Jack buffer
	
	void* jack_buffer = jack_port_get_buffer(_port, _nframes_this_cycle);

	//const nframes_t event_count = _buffer.size();
	//if (event_count > 0)
	//	cerr << "MIDIPort writing " << event_count << " events." << endl;

	jack_midi_clear_buffer(jack_buffer);

	for (MidiBuffer::iterator i = _buffer.begin(); i != _buffer.end(); ++i) {
		const MidiEvent& ev = *i;
		// event times should be frames, relative to cycle start
		assert(ev.time() >= 0);
		assert(ev.time() < _nframes_this_cycle);
		jack_midi_event_write(jack_buffer, (jack_nframes_t)ev.time(), ev.buffer(), ev.size());
	}
	
	_nframes_this_cycle = 0;
}