/* This file is part of Ingen.
 * Copyright (C) 2007-2009 Dave Robillard <http://drobilla.net>
 *
 * Ingen 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.
 *
 * 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 General Public License for 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.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "InputPort.hpp"
#include <cstdlib>
#include <cassert>
#include "interface/Patch.hpp"
#include "shared/LV2URIMap.hpp"
#include "AudioBuffer.hpp"
#include "BufferFactory.hpp"
#include "ConnectionImpl.hpp"
#include "EventBuffer.hpp"
#include "NodeImpl.hpp"
#include "OutputPort.hpp"
#include "ProcessContext.hpp"
#include "ThreadManager.hpp"
#include "mix.hpp"
#include "util.hpp"

using namespace std;

namespace Ingen {

namespace Shared { class Patch; }
using namespace Shared;

InputPort::InputPort(BufferFactory&      bufs,
                     NodeImpl*           parent,
                     const Raul::Symbol& symbol,
                     uint32_t            index,
                     uint32_t            poly,
                     PortType            type,
                     const Raul::Atom&   value,
                     size_t              buffer_size)
	: PortImpl(bufs, parent, symbol, index, poly, type, value, buffer_size)
	, _num_connections(0)
{
	const LV2URIMap& uris = Shared::LV2URIMap::instance();

	if (!dynamic_cast<Patch*>(parent))
		add_property(uris.rdf_type, uris.lv2_InputPort);

	// Set default control range
	if (type == PortType::CONTROL) {
		set_property(uris.lv2_minimum, 0.0f);
		set_property(uris.lv2_maximum, 1.0f);
	}
}


bool
InputPort::apply_poly(Maid& maid, uint32_t poly)
{
	bool ret = PortImpl::apply_poly(maid, poly);
	if (!ret)
		poly = 1;

	assert(_buffers->size() >= poly);

	return true;
}


void
InputPort::set_buffer_size(Context& context, BufferFactory& bufs, size_t size)
{
	PortImpl::set_buffer_size(context, bufs, size);

	for (Connections::iterator c = _connections.begin(); c != _connections.end(); ++c)
		((ConnectionImpl*)c->get())->update_buffer_size(context, bufs);
}


/** Set \a buffers appropriately if this port has \a num_connections connections.
 */
void
InputPort::get_buffers(BufferFactory& bufs, Raul::Array<BufferFactory::Ref>* buffers, uint32_t poly)
{
	size_t num_connections = (ThreadManager::current_thread_id() == THREAD_PROCESS)
			? _connections.size() : _num_connections;

	if (_type == PortType::AUDIO && num_connections == 0) {
		// Audio input with no connections, use shared zero buffer
		for (uint32_t v = 0; v < poly; ++v)
			buffers->at(v) = bufs.silent_buffer();

	} else if (num_connections == 1) {
		if (ThreadManager::current_thread_id() == THREAD_PROCESS) {
			// Single connection, use it directly
			for (uint32_t v = 0; v < poly; ++v)
				buffers->at(v) = _connections.front()->buffer(v);
		} else {
			// Not in the process thread, will be set later
			for (uint32_t v = 0; v < poly; ++v)
				buffers->at(v) = NULL;
		}

	} else {
		// Use local buffers
		for (uint32_t v = 0; v < poly; ++v) {
			buffers->at(v) = NULL; // Release first (potential immediate recycling)
			buffers->at(v) = _bufs.get(_type, _buffer_size);
			buffers->at(v)->clear();
		}
	}
}


/** Add a connection.  Realtime safe.
 *
 * The buffer of this port will be set directly to the connection's buffer
 * if there is only one connection, since no copying/mixing needs to take place.
 *
 * Note that setup_buffers must be called after this before the change
 * will audibly take effect.
 */
void
InputPort::add_connection(Connections::Node* const c)
{
	ThreadManager::assert_thread(THREAD_PROCESS);

	_connections.push_back(c);

	// Automatically broadcast connected control inputs
	if (_type == PortType::CONTROL)
		_broadcast = true;
}


/** Remove a connection.  Realtime safe.
 *
 * Note that setup_buffers must be called after this before the change
 * will audibly take effect.
 */
InputPort::Connections::Node*
InputPort::remove_connection(ProcessContext& context, const OutputPort* src_port)
{
	ThreadManager::assert_thread(THREAD_PROCESS);

	Connections::Node* connection = NULL;
	for (Connections::iterator i = _connections.begin(); i != _connections.end();) {
		Connections::iterator next = i;
		++next;

		if ((*i)->src_port() == src_port)
			connection = _connections.erase(i);

		i = next;
	}

	if ( ! connection) {
		error << "[InputPort::remove_connection] Connection not found!" << endl;
		return NULL;
	}

	// Turn off broadcasting if we're no longer connected
	if (_type == PortType::CONTROL && _connections.size() == 0)
		_broadcast = false;

	return connection;
}


/** Prepare buffer for access, mixing if necessary.  Realtime safe.
 */
void
InputPort::pre_process(Context& context)
{
	// If value has been set (e.g. events pushed) by the user, don't smash it
	if (_set_by_user)
		return;

	// Process connections (mix down polyphony, if necessary)
	for (Connections::iterator c = _connections.begin(); c != _connections.end(); ++c)
		(*c)->process(context);

	// Multiple connections, mix them all into our local buffers
	if (_connections.size() > 1) {
		for (uint32_t v = 0; v < _poly; ++v)
			buffer(v)->prepare_write(context);

		for (uint32_t v = 0; v < _poly; ++v) {
			const uint32_t        num_srcs = _connections.size();
			Connections::iterator c        = _connections.begin();
			Buffer* srcs[num_srcs];
			for (uint32_t i = 0; c != _connections.end(); ++c) {
				assert(i < num_srcs);
				srcs[i++] = (*c)->buffer(v).get();
			}

			mix(context, buffer(v).get(), srcs, num_srcs);
		}
	}

	for (uint32_t v = 0; v < _poly; ++v)
		buffer(v)->prepare_read(context);

	if (_broadcast)
		broadcast_value(context, false);
}


void
InputPort::post_process(Context& context)
{
	// Prepare buffers for next cycle
	if (type() != PortType::CONTROL && num_connections() > 1)
		for (uint32_t v = 0; v < _poly; ++v)
			buffer(v)->prepare_write(context);

	_set_by_user = false;
}


} // namespace Ingen