/* 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 "FileSystemRootDirectoryEntry.h"

#include "CallbackRunnables.h"
#include "FileSystemRootDirectoryReader.h"
#include "mozilla/dom/FileSystemUtils.h"
#include "nsReadableUtils.h"

namespace mozilla::dom {

NS_IMPL_CYCLE_COLLECTION_INHERITED(FileSystemRootDirectoryEntry,
                                   FileSystemDirectoryEntry, mEntries)

NS_IMPL_ADDREF_INHERITED(FileSystemRootDirectoryEntry, FileSystemDirectoryEntry)
NS_IMPL_RELEASE_INHERITED(FileSystemRootDirectoryEntry,
                          FileSystemDirectoryEntry)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(FileSystemRootDirectoryEntry)
NS_INTERFACE_MAP_END_INHERITING(FileSystemDirectoryEntry)

FileSystemRootDirectoryEntry::FileSystemRootDirectoryEntry(
    nsIGlobalObject* aGlobal, Sequence<RefPtr<FileSystemEntry>> aEntries,
    FileSystem* aFileSystem)
    : FileSystemDirectoryEntry(aGlobal, nullptr, nullptr, aFileSystem),
      mEntries(std::move(aEntries)) {
  MOZ_ASSERT(aGlobal);
}

FileSystemRootDirectoryEntry::~FileSystemRootDirectoryEntry() = default;

void FileSystemRootDirectoryEntry::GetName(nsAString& aName,
                                           ErrorResult& aRv) const {
  aName.Truncate();
}

void FileSystemRootDirectoryEntry::GetFullPath(nsAString& aPath,
                                               ErrorResult& aRv) const {
  aPath.AssignLiteral(FILESYSTEM_DOM_PATH_SEPARATOR_LITERAL);
}

already_AddRefed<FileSystemDirectoryReader>
FileSystemRootDirectoryEntry::CreateReader() {
  RefPtr<FileSystemDirectoryReader> reader =
      new FileSystemRootDirectoryReader(this, Filesystem(), mEntries);
  return reader.forget();
}

void FileSystemRootDirectoryEntry::GetInternal(
    const nsAString& aPath, const FileSystemFlags& aFlag,
    const Optional<OwningNonNull<FileSystemEntryCallback>>& aSuccessCallback,
    const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
    GetInternalType aType) {
  if (!aSuccessCallback.WasPassed() && !aErrorCallback.WasPassed()) {
    return;
  }

  if (aFlag.mCreate) {
    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
                              NS_ERROR_DOM_SECURITY_ERR);
    return;
  }

  nsTArray<nsString> parts;
  if (!FileSystemUtils::IsValidRelativeDOMPath(aPath, parts)) {
    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
                              NS_ERROR_DOM_NOT_FOUND_ERR);
    return;
  }

  MOZ_ASSERT(!parts.IsEmpty());

  RefPtr<FileSystemEntry> entry;
  for (uint32_t i = 0; i < mEntries.Length(); ++i) {
    ErrorResult rv;
    nsAutoString name;
    mEntries[i]->GetName(name, rv);

    if (NS_WARN_IF(rv.Failed())) {
      ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
                                rv.StealNSResult());
      return;
    }

    if (name == parts[0]) {
      entry = mEntries[i];
      break;
    }
  }

  // Not found.
  if (!entry) {
    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
                              NS_ERROR_DOM_NOT_FOUND_ERR);
    return;
  }

  // No subdirectory in the path.
  if (parts.Length() == 1) {
    if ((entry->IsFile() && aType == eGetDirectory) ||
        (entry->IsDirectory() && aType == eGetFile)) {
      ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
                                NS_ERROR_DOM_TYPE_MISMATCH_ERR);
      return;
    }

    if (aSuccessCallback.WasPassed()) {
      RefPtr<EntryCallbackRunnable> runnable =
          new EntryCallbackRunnable(&aSuccessCallback.Value(), entry);

      FileSystemUtils::DispatchRunnable(GetParentObject(), runnable.forget());
    }
    return;
  }

  // Subdirectories, but this is a file.
  if (entry->IsFile()) {
    ErrorCallbackHelper::Call(GetParentObject(), aErrorCallback,
                              NS_ERROR_DOM_NOT_FOUND_ERR);
    return;
  }

  // Let's recreate a path without the first directory.
  nsAutoString path;
  StringJoinAppend(
      path,
      NS_LITERAL_STRING_FROM_CSTRING(FILESYSTEM_DOM_PATH_SEPARATOR_LITERAL),
      Span{parts}.From(1));

  auto* directoryEntry = static_cast<FileSystemDirectoryEntry*>(entry.get());
  directoryEntry->GetInternal(path, aFlag, aSuccessCallback, aErrorCallback,
                              aType);
}

}  // namespace mozilla::dom