// 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/shell/external_application_registrar_connection.h"

#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "mojo/edk/embedder/channel_init.h"
#include "mojo/public/cpp/bindings/error_handler.h"
#include "mojo/public/interfaces/application/application.mojom.h"
#include "mojo/public/interfaces/application/shell.mojom.h"
#include "mojo/shell/domain_socket/net_errors.h"
#include "mojo/shell/domain_socket/socket_descriptor.h"
#include "mojo/shell/domain_socket/unix_domain_client_socket_posix.h"
#include "mojo/shell/external_application_registrar.mojom.h"
#include "url/gurl.h"

namespace mojo {
namespace shell {

ExternalApplicationRegistrarConnection::ExternalApplicationRegistrarConnection(
    const base::FilePath& socket_path)
    : client_socket_(new UnixDomainClientSocket(socket_path.value(), false)) {
}

ExternalApplicationRegistrarConnection::
    ~ExternalApplicationRegistrarConnection() {
  channel_init_.WillDestroySoon();
}

void ExternalApplicationRegistrarConnection::OnConnectionError() {
  channel_init_.WillDestroySoon();
}

void ExternalApplicationRegistrarConnection::Connect(
    const CompletionCallback& callback) {
  DCHECK(client_socket_) << "Single use only.";
  int rv = client_socket_->Connect(
      base::Bind(&ExternalApplicationRegistrarConnection::OnConnect,
                 base::Unretained(this),
                 callback));
  if (rv != net::ERR_IO_PENDING) {
    DVLOG(1) << "Connect returning immediately: " << net::ErrorToString(rv);
    OnConnect(callback, rv);
    return;
  }
  DVLOG(1) << "Waiting for connection.";
}

void ExternalApplicationRegistrarConnection::Register(
    const GURL& app_url,
    base::Callback<void(ShellPtr)> register_complete_callback) {
  DCHECK(!client_socket_);
  registrar_->Register(String::From(app_url), register_complete_callback);
}

void ExternalApplicationRegistrarConnection::OnConnect(
    CompletionCallback callback,
    int rv) {
  DVLOG(1) << "OnConnect called: " << net::ErrorToString(rv);
  if (rv != net::OK) {
    callback.Run(rv);
    return;
  }

  mojo::ScopedMessagePipeHandle ptr_message_pipe_handle =
      channel_init_.Init(client_socket_->ReleaseConnectedSocket(),
                         base::MessageLoopProxy::current());
  CHECK(ptr_message_pipe_handle.is_valid());
  client_socket_.reset();  // This is dead now, ensure it can't be reused.

  registrar_.Bind(ptr_message_pipe_handle.Pass());
  callback.Run(rv);
}

}  // namespace shell
}  // namespace mojo