// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "mojo/system/entrypoints.h"

#include "base/logging.h"
#include "mojo/public/c/system/buffer.h"
#include "mojo/public/c/system/data_pipe.h"
#include "mojo/public/c/system/functions.h"
#include "mojo/public/c/system/message_pipe.h"
#include "mojo/system/core.h"

static mojo::system::Core* g_core = nullptr;

using mojo::system::MakeUserPointer;

namespace mojo {
namespace system {
namespace entrypoints {

void SetCore(Core* core) {
  g_core = core;
}

Core* GetCore() {
  return g_core;
}

}  // namespace entrypoints
}  // namepace system
}  // namespace mojo

// Definitions of the system functions.
extern "C" {
MojoTimeTicks MojoGetTimeTicksNow() {
  return g_core->GetTimeTicksNow();
}

MojoResult MojoClose(MojoHandle handle) {
  return g_core->Close(handle);
}

MojoResult MojoWait(MojoHandle handle,
                    MojoHandleSignals signals,
                    MojoDeadline deadline) {
  return g_core->Wait(
      handle, signals, deadline, mojo::system::NullUserPointer());
}

MojoResult MojoWaitMany(const MojoHandle* handles,
                        const MojoHandleSignals* signals,
                        uint32_t num_handles,
                        MojoDeadline deadline) {
  uint32_t result_index = static_cast<uint32_t>(-1);
  MojoResult result = g_core->WaitMany(MakeUserPointer(handles),
                                       MakeUserPointer(signals),
                                       num_handles,
                                       deadline,
                                       MakeUserPointer(&result_index),
                                       mojo::system::NullUserPointer());
  return (result == MOJO_RESULT_OK) ? static_cast<MojoResult>(result_index)
                                    : result;
}

MojoResult MojoCreateMessagePipe(const MojoCreateMessagePipeOptions* options,
                                 MojoHandle* message_pipe_handle0,
                                 MojoHandle* message_pipe_handle1) {
  return g_core->CreateMessagePipe(MakeUserPointer(options),
                                   MakeUserPointer(message_pipe_handle0),
                                   MakeUserPointer(message_pipe_handle1));
}

MojoResult MojoWriteMessage(MojoHandle message_pipe_handle,
                            const void* bytes,
                            uint32_t num_bytes,
                            const MojoHandle* handles,
                            uint32_t num_handles,
                            MojoWriteMessageFlags flags) {
  return g_core->WriteMessage(message_pipe_handle,
                              MakeUserPointer(bytes),
                              num_bytes,
                              MakeUserPointer(handles),
                              num_handles,
                              flags);
}

MojoResult MojoReadMessage(MojoHandle message_pipe_handle,
                           void* bytes,
                           uint32_t* num_bytes,
                           MojoHandle* handles,
                           uint32_t* num_handles,
                           MojoReadMessageFlags flags) {
  return g_core->ReadMessage(message_pipe_handle,
                             MakeUserPointer(bytes),
                             MakeUserPointer(num_bytes),
                             MakeUserPointer(handles),
                             MakeUserPointer(num_handles),
                             flags);
}

MojoResult MojoCreateDataPipe(const MojoCreateDataPipeOptions* options,
                              MojoHandle* data_pipe_producer_handle,
                              MojoHandle* data_pipe_consumer_handle) {
  return g_core->CreateDataPipe(MakeUserPointer(options),
                                MakeUserPointer(data_pipe_producer_handle),
                                MakeUserPointer(data_pipe_consumer_handle));
}

MojoResult MojoWriteData(MojoHandle data_pipe_producer_handle,
                         const void* elements,
                         uint32_t* num_elements,
                         MojoWriteDataFlags flags) {
  return g_core->WriteData(data_pipe_producer_handle,
                           MakeUserPointer(elements),
                           MakeUserPointer(num_elements),
                           flags);
}

MojoResult MojoBeginWriteData(MojoHandle data_pipe_producer_handle,
                              void** buffer,
                              uint32_t* buffer_num_elements,
                              MojoWriteDataFlags flags) {
  return g_core->BeginWriteData(data_pipe_producer_handle,
                                MakeUserPointer(buffer),
                                MakeUserPointer(buffer_num_elements),
                                flags);
}

MojoResult MojoEndWriteData(MojoHandle data_pipe_producer_handle,
                            uint32_t num_elements_written) {
  return g_core->EndWriteData(data_pipe_producer_handle, num_elements_written);
}

MojoResult MojoReadData(MojoHandle data_pipe_consumer_handle,
                        void* elements,
                        uint32_t* num_elements,
                        MojoReadDataFlags flags) {
  return g_core->ReadData(data_pipe_consumer_handle,
                          MakeUserPointer(elements),
                          MakeUserPointer(num_elements),
                          flags);
}

MojoResult MojoBeginReadData(MojoHandle data_pipe_consumer_handle,
                             const void** buffer,
                             uint32_t* buffer_num_elements,
                             MojoReadDataFlags flags) {
  return g_core->BeginReadData(data_pipe_consumer_handle,
                               MakeUserPointer(buffer),
                               MakeUserPointer(buffer_num_elements),
                               flags);
}

MojoResult MojoEndReadData(MojoHandle data_pipe_consumer_handle,
                           uint32_t num_elements_read) {
  return g_core->EndReadData(data_pipe_consumer_handle, num_elements_read);
}

MojoResult MojoCreateSharedBuffer(
    const struct MojoCreateSharedBufferOptions* options,
    uint64_t num_bytes,
    MojoHandle* shared_buffer_handle) {
  return g_core->CreateSharedBuffer(MakeUserPointer(options),
                                    num_bytes,
                                    MakeUserPointer(shared_buffer_handle));
}

MojoResult MojoDuplicateBufferHandle(
    MojoHandle buffer_handle,
    const struct MojoDuplicateBufferHandleOptions* options,
    MojoHandle* new_buffer_handle) {
  return g_core->DuplicateBufferHandle(buffer_handle,
                                       MakeUserPointer(options),
                                       MakeUserPointer(new_buffer_handle));
}

MojoResult MojoMapBuffer(MojoHandle buffer_handle,
                         uint64_t offset,
                         uint64_t num_bytes,
                         void** buffer,
                         MojoMapBufferFlags flags) {
  return g_core->MapBuffer(
      buffer_handle, offset, num_bytes, MakeUserPointer(buffer), flags);
}

MojoResult MojoUnmapBuffer(void* buffer) {
  return g_core->UnmapBuffer(MakeUserPointer(buffer));
}

}  // extern "C"