// Copyright 2010-2015, Google Inc.
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//
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// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
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// this software without specific prior written permission.
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#include "ipc/ipc.h"

#ifdef OS_WIN
#include <windows.h>
#else
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#endif

#include <cstdlib>

#include "base/logging.h"
#include "base/port.h"
#include "base/singleton.h"
#include "base/thread.h"
#include "ipc/ipc_path_manager.h"

namespace mozc {

namespace {

class IPCServerThread : public Thread {
 public:
  explicit IPCServerThread(IPCServer *server)
      : server_(server) {}
  virtual ~IPCServerThread() {}
  virtual void Run() {
    if (server_ != NULL) {
      server_->Loop();
    }
  }

 private:
  IPCServer *server_;

  DISALLOW_COPY_AND_ASSIGN(IPCServerThread);
};

}  // namespace

void IPCServer::LoopAndReturn() {
  if (server_thread_.get() == NULL) {
    server_thread_.reset(new IPCServerThread(this));
    server_thread_->SetJoinable(true);
    server_thread_->Start();
  } else {
    LOG(WARNING) << "Another thead is already running";
  }
}

void IPCServer::Wait() {
  if (server_thread_.get() != NULL) {
    server_thread_->Join();
    server_thread_.reset(NULL);
  }
}

IPCClientInterface::~IPCClientInterface() {
}

IPCClientFactoryInterface::~IPCClientFactoryInterface() {
}

IPCClientFactory::~IPCClientFactory() {
}

IPCClientInterface *IPCClientFactory::NewClient(const string &name,
                                                const string &path_name) {
  return new IPCClient(name, path_name);
}

IPCClientInterface *IPCClientFactory::NewClient(const string &name) {
  return new IPCClient(name);
}

// static
IPCClientFactory *IPCClientFactory::GetIPCClientFactory() {
  return Singleton<IPCClientFactory>::get();
}

uint32 IPCClient::GetServerProtocolVersion() const {
  DCHECK(ipc_path_manager_);
  return ipc_path_manager_->GetServerProtocolVersion();
}

const string &IPCClient::GetServerProductVersion() const {
  DCHECK(ipc_path_manager_);
  return ipc_path_manager_->GetServerProductVersion();
}

uint32 IPCClient::GetServerProcessId() const {
  DCHECK(ipc_path_manager_);
  return ipc_path_manager_->GetServerProcessId();
}

// static
bool IPCClient::TerminateServer(const string &name) {
  IPCClient client(name);

  if (!client.Connected()) {
    LOG(ERROR) << "Server " << name << " is not running";
    return true;
  }

  const uint32 pid = client.GetServerProcessId();
  if (pid == 0) {
    LOG(ERROR) << "pid is not a valid value: " << pid;
    return false;
  }

#ifdef OS_WIN
  HANDLE handle = ::OpenProcess(PROCESS_TERMINATE,
                                false, static_cast<DWORD>(pid));
  if (NULL == handle) {
    LOG(ERROR) << "OpenProcess failed: " << ::GetLastError();
    return false;
  }

  if (!::TerminateProcess(handle, 0)) {
    LOG(ERROR) << "TerminateProcess failed: " << ::GetLastError();
    ::CloseHandle(handle);
    return false;
  }

  VLOG(1) << "Success to terminate the server: " << name << " " << pid;

  ::CloseHandle(handle);

  return true;
#else
  if (-1 == ::kill(static_cast<pid_t>(pid), 9)) {
    LOG(ERROR) << "kill failed: " << errno;
    return false;
  }

  return true;
#endif
}
}  // namespace mozc