/* 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 "GetFileOrDirectoryTask.h"

#include "js/Value.h"
#include "mozilla/dom/FileBlobImpl.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 {

/**
 * GetFileOrDirectoryTaskChild
 */

/* static */
already_AddRefed<GetFileOrDirectoryTaskChild>
GetFileOrDirectoryTaskChild::Create(FileSystemBase* aFileSystem,
                                    nsIFile* aTargetPath, ErrorResult& aRv) {
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  MOZ_ASSERT(aFileSystem);

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

  RefPtr<GetFileOrDirectoryTaskChild> task =
      new GetFileOrDirectoryTaskChild(globalObject, aFileSystem, aTargetPath);

  // 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();
}

GetFileOrDirectoryTaskChild::GetFileOrDirectoryTaskChild(
    nsIGlobalObject* aGlobalObject, FileSystemBase* aFileSystem,
    nsIFile* aTargetPath)
    : FileSystemTaskChildBase(aGlobalObject, aFileSystem),
      mTargetPath(aTargetPath) {
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  MOZ_ASSERT(aFileSystem);
}

GetFileOrDirectoryTaskChild::~GetFileOrDirectoryTaskChild() {
  MOZ_ASSERT(NS_IsMainThread());
}

already_AddRefed<Promise> GetFileOrDirectoryTaskChild::GetPromise() {
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  return RefPtr<Promise>(mPromise).forget();
}

FileSystemParams GetFileOrDirectoryTaskChild::GetRequestParams(
    const nsString& aSerializedDOMPath, ErrorResult& aRv) const {
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");

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

  return FileSystemGetFileOrDirectoryParams(aSerializedDOMPath, path);
}

void GetFileOrDirectoryTaskChild::SetSuccessRequestResult(
    const FileSystemResponseValue& aValue, ErrorResult& aRv) {
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  switch (aValue.type()) {
    case FileSystemResponseValue::TFileSystemFileResponse: {
      FileSystemFileResponse r = aValue;

      RefPtr<BlobImpl> blobImpl = IPCBlobUtils::Deserialize(r.blob());
      MOZ_ASSERT(blobImpl);

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

      mResultFile = File::Create(globalObject, blobImpl);
      if (NS_WARN_IF(!mResultFile)) {
        aRv.Throw(NS_ERROR_FAILURE);
      }
      break;
    }
    case FileSystemResponseValue::TFileSystemDirectoryResponse: {
      FileSystemDirectoryResponse r = aValue;

      nsCOMPtr<nsIFile> file;
      aRv = NS_NewLocalFile(r.realPath(), getter_AddRefs(file));
      if (NS_WARN_IF(aRv.Failed())) {
        return;
      }

      mResultDirectory =
          Directory::Create(mFileSystem->GetParentObject(), file, mFileSystem);
      MOZ_ASSERT(mResultDirectory);
      break;
    }
    default: {
      MOZ_CRASH("not reached");
      break;
    }
  }
}

void GetFileOrDirectoryTaskChild::HandlerCallback() {
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  if (mFileSystem->IsShutdown()) {
    mPromise = nullptr;
    return;
  }

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

  if (mResultDirectory) {
    mPromise->MaybeResolve(mResultDirectory);
    mResultDirectory = nullptr;
    mPromise = nullptr;
    return;
  }

  MOZ_ASSERT(mResultFile);
  mPromise->MaybeResolve(mResultFile);
  mResultFile = nullptr;
  mPromise = nullptr;
}

/**
 * GetFileOrDirectoryTaskParent
 */

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

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

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

  return task.forget();
}

GetFileOrDirectoryTaskParent::GetFileOrDirectoryTaskParent(
    FileSystemBase* aFileSystem,
    const FileSystemGetFileOrDirectoryParams& aParam,
    FileSystemRequestParent* aParent)
    : FileSystemTaskParentBase(aFileSystem, aParam, aParent),
      mIsDirectory(false) {
  MOZ_ASSERT(XRE_IsParentProcess(), "Only call from parent process!");
  mozilla::ipc::AssertIsOnBackgroundThread();
  MOZ_ASSERT(aFileSystem);
}

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

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

  if (mIsDirectory) {
    return FileSystemDirectoryResponse(path);
  }

  RefPtr<BlobImpl> blobImpl = new FileBlobImpl(mTargetPath);

  IPCBlob ipcBlob;
  aRv = IPCBlobUtils::Serialize(blobImpl, ipcBlob);
  if (NS_WARN_IF(aRv.Failed())) {
    return FileSystemDirectoryResponse();
  }

  return FileSystemFileResponse(ipcBlob);
}

nsresult GetFileOrDirectoryTaskParent::IOWork() {
  MOZ_ASSERT(XRE_IsParentProcess(), "Only call from parent process!");
  MOZ_ASSERT(!NS_IsMainThread(), "Only call on worker thread!");

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

  // Whether we want to get the root directory.
  bool exists;
  nsresult rv = mTargetPath->Exists(&exists);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!exists) {
    if (!mFileSystem->ShouldCreateDirectory()) {
      return NS_ERROR_DOM_FILE_NOT_FOUND_ERR;
    }

    rv = mTargetPath->Create(nsIFile::DIRECTORY_TYPE, 0777);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
  }

  // Get isDirectory.
  rv = mTargetPath->IsDirectory(&mIsDirectory);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (mIsDirectory) {
    return NS_OK;
  }

  bool isFile;
  // Get isFile
  rv = mTargetPath->IsFile(&isFile);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!isFile) {
    // Neither directory or file.
    return NS_ERROR_DOM_FILESYSTEM_TYPE_MISMATCH_ERR;
  }

  if (!mFileSystem->IsSafeFile(mTargetPath)) {
    return NS_ERROR_DOM_SECURITY_ERR;
  }

  return NS_OK;
}

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

}  // namespace mozilla::dom