/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "GetFilesTask.h"

#include "HTMLSplitOnSpacesTokenizer.h"
#include "js/Value.h"
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FileSystemBase.h"
#include "mozilla/dom/FileSystemUtils.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/dom/PFileSystemParams.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/ipc/BackgroundParent.h"
#include "nsIFile.h"
#include "nsString.h"

namespace mozilla::dom {

/**
 * GetFilesTaskChild
 */

/* static */
already_AddRefed<GetFilesTaskChild> GetFilesTaskChild::Create(
    FileSystemBase* aFileSystem, Directory* aDirectory, nsIFile* aTargetPath,
    bool aRecursiveFlag, ErrorResult& aRv) {
  MOZ_ASSERT(aFileSystem);
  MOZ_ASSERT(aDirectory);
  aFileSystem->AssertIsOnOwningThread();

  nsCOMPtr<nsIGlobalObject> globalObject = aFileSystem->GetParentObject();
  if (NS_WARN_IF(!globalObject)) {
    aRv.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  RefPtr<GetFilesTaskChild> task = new GetFilesTaskChild(
      globalObject, aFileSystem, aDirectory, aTargetPath, aRecursiveFlag);

  // aTargetPath can be null. In this case SetError will be called.

  task->mPromise = Promise::Create(globalObject, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  return task.forget();
}

GetFilesTaskChild::GetFilesTaskChild(nsIGlobalObject* aGlobalObject,
                                     FileSystemBase* aFileSystem,
                                     Directory* aDirectory,
                                     nsIFile* aTargetPath, bool aRecursiveFlag)
    : FileSystemTaskChildBase(aGlobalObject, aFileSystem),
      mDirectory(aDirectory),
      mTargetPath(aTargetPath),
      mRecursiveFlag(aRecursiveFlag) {
  MOZ_ASSERT(aFileSystem);
  MOZ_ASSERT(aDirectory);
  aFileSystem->AssertIsOnOwningThread();
}

GetFilesTaskChild::~GetFilesTaskChild() {
  mFileSystem->AssertIsOnOwningThread();
}

already_AddRefed<Promise> GetFilesTaskChild::GetPromise() {
  mFileSystem->AssertIsOnOwningThread();
  return RefPtr<Promise>(mPromise).forget();
}

FileSystemParams GetFilesTaskChild::GetRequestParams(
    const nsString& aSerializedDOMPath, ErrorResult& aRv) const {
  mFileSystem->AssertIsOnOwningThread();

  nsAutoString path;
  aRv = mTargetPath->GetPath(path);
  if (NS_WARN_IF(aRv.Failed())) {
    return FileSystemGetFilesParams();
  }

  nsAutoString domPath;
  mDirectory->GetPath(domPath, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return FileSystemGetFilesParams();
  }

  return FileSystemGetFilesParams(aSerializedDOMPath, path, domPath,
                                  mRecursiveFlag);
}

void GetFilesTaskChild::SetSuccessRequestResult(
    const FileSystemResponseValue& aValue, ErrorResult& aRv) {
  mFileSystem->AssertIsOnOwningThread();
  MOZ_ASSERT(aValue.type() ==
             FileSystemResponseValue::TFileSystemFilesResponse);

  FileSystemFilesResponse r = aValue;

  if (!mTargetData.SetLength(r.data().Length(), mozilla::fallible_t())) {
    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
    return;
  }

  nsCOMPtr<nsIGlobalObject> globalObject = mFileSystem->GetParentObject();
  MOZ_ASSERT(globalObject);

  for (uint32_t i = 0; i < r.data().Length(); ++i) {
    const FileSystemFileResponse& data = r.data()[i];
    RefPtr<BlobImpl> blobImpl = IPCBlobUtils::Deserialize(data.blob());
    MOZ_ASSERT(blobImpl);

    mTargetData[i] = File::Create(globalObject, blobImpl);
    if (NS_WARN_IF(!mTargetData[i])) {
      aRv.Throw(NS_ERROR_FAILURE);
      return;
    }
  }
}

void GetFilesTaskChild::HandlerCallback() {
  mFileSystem->AssertIsOnOwningThread();
  if (mFileSystem->IsShutdown()) {
    mPromise = nullptr;
    return;
  }

  if (HasError()) {
    mPromise->MaybeReject(NS_ERROR_DOM_INVALID_STATE_ERR);
    mPromise = nullptr;
    return;
  }

  mPromise->MaybeResolve(mTargetData);
  mPromise = nullptr;
}

/**
 * GetFilesTaskParent
 */

/* static */
already_AddRefed<GetFilesTaskParent> GetFilesTaskParent::Create(
    FileSystemBase* aFileSystem, const FileSystemGetFilesParams& aParam,
    FileSystemRequestParent* aParent, ErrorResult& aRv) {
  MOZ_ASSERT(XRE_IsParentProcess(), "Only call from parent process!");
  mozilla::ipc::AssertIsOnBackgroundThread();
  MOZ_ASSERT(aFileSystem);

  RefPtr<GetFilesTaskParent> task =
      new GetFilesTaskParent(aFileSystem, aParam, aParent);

  aRv = NS_NewLocalFile(aParam.realPath(), true,
                        getter_AddRefs(task->mTargetPath));
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  return task.forget();
}

GetFilesTaskParent::GetFilesTaskParent(FileSystemBase* aFileSystem,
                                       const FileSystemGetFilesParams& aParam,
                                       FileSystemRequestParent* aParent)
    : FileSystemTaskParentBase(aFileSystem, aParam, aParent),
      GetFilesHelperBase(aParam.recursiveFlag()),
      mDirectoryDOMPath(aParam.domPath()) {
  MOZ_ASSERT(XRE_IsParentProcess(), "Only call from parent process!");
  mozilla::ipc::AssertIsOnBackgroundThread();
  MOZ_ASSERT(aFileSystem);
}

FileSystemResponseValue GetFilesTaskParent::GetSuccessRequestResult(
    ErrorResult& aRv) const {
  mozilla::ipc::AssertIsOnBackgroundThread();

  FallibleTArray<FileSystemFileResponse> inputs;
  if (!inputs.SetLength(mTargetBlobImplArray.Length(), mozilla::fallible_t())) {
    FileSystemFilesResponse response;
    aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
    return response;
  }

  for (unsigned i = 0; i < mTargetBlobImplArray.Length(); i++) {
    IPCBlob ipcBlob;
    aRv = IPCBlobUtils::Serialize(mTargetBlobImplArray[i], ipcBlob);
    if (NS_WARN_IF(aRv.Failed())) {
      FileSystemFilesResponse response;
      return response;
    }

    inputs[i] = FileSystemFileResponse(ipcBlob);
  }

  FileSystemFilesResponse response;
  response.data() = std::move(inputs);
  return response;
}

nsresult GetFilesTaskParent::IOWork() {
  MOZ_ASSERT(XRE_IsParentProcess(), "Only call from parent process!");
  MOZ_ASSERT(!NS_IsMainThread(), "Only call on I/O thread!");

  if (mFileSystem->IsShutdown()) {
    return NS_ERROR_FAILURE;
  }

  bool exists;
  nsresult rv = mTargetPath->Exists(&exists);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!exists) {
    return NS_OK;
  }

  bool isDir;
  rv = mTargetPath->IsDirectory(&isDir);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!isDir) {
    return NS_ERROR_DOM_FILESYSTEM_TYPE_MISMATCH_ERR;
  }

  // Get isDirectory.
  rv = ExploreDirectory(mDirectoryDOMPath, mTargetPath);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  return NS_OK;
}

nsresult GetFilesTaskParent::GetTargetPath(nsAString& aPath) const {
  return mTargetPath->GetPath(aPath);
}

}  // namespace mozilla::dom
