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// shared memory interface to the supercollider server
// Copyright (C) 2011 Tim Blechmann
// Copyright (C) 2011 Jakob Leben
//
// 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; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.

#ifndef SERVER_SHM_HPP
#define SERVER_SHM_HPP

#include "scope_buffer.hpp"

#include <boost/foreach.hpp>
#include <boost/ref.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/vector.hpp>
#include <boost/atomic.hpp>

namespace detail_server_shm {

using std::string; using std::pair;

using boost::ref;

namespace bi = boost::interprocess;
using bi::managed_shared_memory; using bi::shared_memory_object;

static inline string make_shmem_name(uint port_number)
{
return string("SuperColliderServer_") + boost::lexical_cast<string>(port_number);
}

struct server_shared_memory
{
typedef offset_ptr<float> sh_float_ptr;
typedef offset_ptr<scope_buffer> scope_buffer_ptr;

typedef bi::allocator<scope_buffer_ptr, managed_shared_memory::segment_manager> scope_buffer_ptr_allocator;
typedef bi::vector<scope_buffer_ptr, scope_buffer_ptr_allocator> scope_buffer_vector;

server_shared_memory(managed_shared_memory & segment, int control_busses, int num_scope_buffers = 128):
num_control_busses(control_busses),

scope_buffers(scope_buffer_ptr_allocator(segment.get_segment_manager()))
{
control_busses_ = (float*)segment.allocate(control_busses * sizeof(float));
std::fill(control_busses_.get(), control_busses_.get() + control_busses, 0);

for (int i = 0; i != num_scope_buffers; ++i) {
scope_buffer * raw_scope_ptr = (scope_buffer*)segment.allocate(sizeof(scope_buffer));
new(raw_scope_ptr) scope_buffer();
scope_buffer_ptr buf = raw_scope_ptr;
scope_buffers.push_back(buf);
}
}

void destroy(managed_shared_memory & segment)
{
segment.deallocate(control_busses_.get());

for (int i = 0; i != scope_buffers.size(); ++i)
segment.deallocate(scope_buffers[i].get());
}

void set_control_bus(int bus, float value)
{
// TODO: we need to set the control busses via a work queue
}

float * get_control_busses(void)
{
return control_busses_.get();
}

scope_buffer * get_scope_buffer(uint index)
{
if (index < scope_buffers.size())
return scope_buffers[index].get();
else
return 0;
}

private:
string shmem_name;
int num_control_busses;
sh_float_ptr control_busses_; // control busses
scope_buffer_vector scope_buffers;
};

class server_shared_memory_creator
{
public:
server_shared_memory_creator(uint port_number, uint control_busses):
shmem_name(detail_server_shm::make_shmem_name(port_number)),
segment(bi::open_or_create, shmem_name.c_str(), 8192 * 1024)
{
segment.flush();

const int num_scope_buffers = 128;
size_t scope_pool_size = num_scope_buffers * sizeof(float) * 8192; // pessimize, about 4 MB
void * memory_for_scope_pool = segment.allocate(scope_pool_size);
scope_pool.init(memory_for_scope_pool, scope_pool_size);

shm = segment.construct<server_shared_memory>(shmem_name.c_str())(ref(segment), control_busses,
num_scope_buffers);
}

static void cleanup(uint port_number)
{
shared_memory_object::remove(detail_server_shm::make_shmem_name(port_number).c_str());
}

~server_shared_memory_creator(void)
{
shm->destroy(segment);
segment.destroy<server_shared_memory>(shmem_name.c_str());
shared_memory_object::remove(shmem_name.c_str());
}

float * get_control_busses(void)
{
return shm->get_control_busses();
}

scope_buffer_writer get_scope_buffer_writer(uint index, uint channels, uint size)
{
scope_buffer *buf = shm->get_scope_buffer(index);
if (buf)
return scope_buffer_writer(buf, scope_pool, channels, size);
else
return scope_buffer_writer();
}

void release_scope_buffer_writer( scope_buffer_writer & writer )
{
writer.release( scope_pool );
}

private:
string shmem_name;
managed_shared_memory segment;
scope_buffer_pool scope_pool;

protected:
server_shared_memory * shm;
};


class server_shared_memory_client
{
public:
server_shared_memory_client(uint port_number):
shmem_name(detail_server_shm::make_shmem_name(port_number)),
segment(bi::open_only, shmem_name.c_str())
{
pair<server_shared_memory*, size_t> res = segment.find<server_shared_memory> (shmem_name.c_str());
if (res.second != 1)
throw std::runtime_error("Cannot connect to shared memory");
shm = res.first;
}

float * get_control_busses(void)
{
return shm->get_control_busses();
}

scope_buffer_reader get_scope_buffer_reader(uint index)
{
scope_buffer *buf = shm->get_scope_buffer(index);
return scope_buffer_reader(buf);
}

private:
string shmem_name;
managed_shared_memory segment;
server_shared_memory * shm;
};

}

using detail_server_shm::server_shared_memory_client;
using detail_server_shm::server_shared_memory_creator;
using detail_server_shm::scope_buffer_writer;
using detail_server_shm::scope_buffer_reader;
using detail_server_shm::scope_buffer;

#endif /* SERVER_SHM_HPP */
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