// Copyright 2018 The Fuchsia 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 "isolate_configurator.h"

#include "dart-pkg/fuchsia/sdk_ext/fuchsia.h"
#include "dart-pkg/zircon/sdk_ext/handle.h"
#include "src/lib/fxl/logging.h"
#include "third_party/dart/runtime/include/dart_api.h"
#include "third_party/tonic/converter/dart_converter.h"
#include "third_party/tonic/dart_state.h"
#include "third_party/tonic/logging/dart_error.h"

namespace flutter {

IsolateConfigurator::IsolateConfigurator(
    UniqueFDIONS fdio_ns,
    fidl::InterfaceHandle<fuchsia::sys::Environment> environment,
    zx::channel directory_request)
    : fdio_ns_(std::move(fdio_ns)),
      environment_(std::move(environment)),
      directory_request_(std::move(directory_request)) {}

IsolateConfigurator::~IsolateConfigurator() = default;

bool IsolateConfigurator::ConfigureCurrentIsolate() {
  if (used_) {
    return false;
  }
  used_ = true;

  BindFuchsia();
  BindZircon();
  BindDartIO();

  // This is now owned by the Dart bindings. So relinquish our ownership of the
  // handle.
  (void)fdio_ns_.release();

  return true;
}

void IsolateConfigurator::BindFuchsia() {
  fuchsia::dart::Initialize(std::move(environment_),
                            std::move(directory_request_));
}

void IsolateConfigurator::BindZircon() {
  // Tell dart:zircon about the FDIO namespace configured for this instance.
  Dart_Handle zircon_lib = Dart_LookupLibrary(tonic::ToDart("dart:zircon"));
  FXL_CHECK(!tonic::LogIfError(zircon_lib));

  Dart_Handle namespace_type =
      Dart_GetType(zircon_lib, tonic::ToDart("_Namespace"), 0, nullptr);
  FXL_CHECK(!tonic::LogIfError(namespace_type));

  Dart_Handle result =
      Dart_SetField(namespace_type,               //
                    tonic::ToDart("_namespace"),  //
                    tonic::ToDart(reinterpret_cast<intptr_t>(fdio_ns_.get())));
  FXL_CHECK(!tonic::LogIfError(result));
}

void IsolateConfigurator::BindDartIO() {
  // Grab the dart:io lib.
  Dart_Handle io_lib = Dart_LookupLibrary(tonic::ToDart("dart:io"));
  FXL_CHECK(!tonic::LogIfError(io_lib));

  // Disable dart:io exit()
  Dart_Handle embedder_config_type =
      Dart_GetType(io_lib, tonic::ToDart("_EmbedderConfig"), 0, nullptr);
  FXL_CHECK(!tonic::LogIfError(embedder_config_type));

  Dart_Handle result = Dart_SetField(embedder_config_type,
                                     tonic::ToDart("_mayExit"), Dart_False());
  FXL_CHECK(!tonic::LogIfError(result));

  // Tell dart:io about the FDIO namespace configured for this instance.
  Dart_Handle namespace_type =
      Dart_GetType(io_lib, tonic::ToDart("_Namespace"), 0, nullptr);
  FXL_CHECK(!tonic::LogIfError(namespace_type));

  Dart_Handle namespace_args[] = {
      Dart_NewInteger(reinterpret_cast<intptr_t>(fdio_ns_.get())),  //
  };
  result = Dart_Invoke(namespace_type, tonic::ToDart("_setupNamespace"),
                       1, namespace_args);
  FXL_CHECK(!tonic::LogIfError(result));
}

}  // namespace flutter