/* -*- 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 "CallbackRunnables.h"
#include "mozilla/dom/Directory.h"
#include "mozilla/dom/DirectoryBinding.h"
#include "mozilla/dom/DOMException.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FileBinding.h"
#include "mozilla/dom/FileSystemDirectoryReaderBinding.h"
#include "mozilla/dom/FileSystemFileEntry.h"
#include "mozilla/dom/FileSystemUtils.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/Unused.h"
#include "nsIGlobalObject.h"
#include "nsIFile.h"
#include "nsPIDOMWindow.h"

#include "../GetFileOrDirectoryTask.h"

namespace mozilla {
namespace dom {

EntryCallbackRunnable::EntryCallbackRunnable(FileSystemEntryCallback* aCallback,
                                             FileSystemEntry* aEntry)
  : mCallback(aCallback)
  , mEntry(aEntry)
{
  MOZ_ASSERT(aCallback);
  MOZ_ASSERT(aEntry);
}

NS_IMETHODIMP
EntryCallbackRunnable::Run()
{
  mCallback->HandleEvent(*mEntry);
  return NS_OK;
}

ErrorCallbackRunnable::ErrorCallbackRunnable(nsIGlobalObject* aGlobalObject,
                                             ErrorCallback* aCallback,
                                             nsresult aError)
  : mGlobal(aGlobalObject)
  , mCallback(aCallback)
  , mError(aError)
{
  MOZ_ASSERT(aGlobalObject);
  MOZ_ASSERT(aCallback);
  MOZ_ASSERT(NS_FAILED(aError));
}

NS_IMETHODIMP
ErrorCallbackRunnable::Run()
{
  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(mGlobal);
  if (NS_WARN_IF(!window)) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<DOMException> exception = DOMException::Create(mError);
  mCallback->HandleEvent(*exception);
  return NS_OK;
}

EmptyEntriesCallbackRunnable::EmptyEntriesCallbackRunnable(FileSystemEntriesCallback* aCallback)
  : mCallback(aCallback)
{
  MOZ_ASSERT(aCallback);
}

NS_IMETHODIMP
EmptyEntriesCallbackRunnable::Run()
{
  Sequence<OwningNonNull<FileSystemEntry>> sequence;
  mCallback->HandleEvent(sequence);
  return NS_OK;
}

GetEntryHelper::GetEntryHelper(FileSystemDirectoryEntry* aParentEntry,
                               Directory* aDirectory,
                               nsTArray<nsString>& aParts,
                               FileSystem* aFileSystem,
                               FileSystemEntryCallback* aSuccessCallback,
                               ErrorCallback* aErrorCallback,
                               FileSystemDirectoryEntry::GetInternalType aType)
  : mParentEntry(aParentEntry)
  , mDirectory(aDirectory)
  , mParts(aParts)
  , mFileSystem(aFileSystem)
  , mSuccessCallback(aSuccessCallback)
  , mErrorCallback(aErrorCallback)
  , mType(aType)
{
  MOZ_ASSERT(aParentEntry);
  MOZ_ASSERT(aDirectory);
  MOZ_ASSERT(!aParts.IsEmpty());
  MOZ_ASSERT(aFileSystem);
  MOZ_ASSERT(aSuccessCallback || aErrorCallback);
}

GetEntryHelper::~GetEntryHelper()
{}

namespace {

nsresult
DOMPathToRealPath(Directory* aDirectory, const nsAString& aPath,
                  nsIFile** aFile)
{
  nsString relativePath;
  relativePath = aPath;

  // Trim white spaces.
  static const char kWhitespace[] = "\b\t\r\n ";
  relativePath.Trim(kWhitespace);

  nsTArray<nsString> parts;
  if (!FileSystemUtils::IsValidRelativeDOMPath(relativePath, parts)) {
    return NS_ERROR_DOM_FILESYSTEM_INVALID_PATH_ERR;
  }

  nsCOMPtr<nsIFile> file;
  nsresult rv = aDirectory->GetInternalNsIFile()->Clone(getter_AddRefs(file));
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  for (uint32_t i = 0; i < parts.Length(); ++i) {
    rv = file->AppendRelativePath(parts[i]);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
  }

  file.forget(aFile);
  return NS_OK;
}

} // anonymous

void
GetEntryHelper::Run()
{
  MOZ_ASSERT(!mParts.IsEmpty());

  nsCOMPtr<nsIFile> realPath;
  nsresult error = DOMPathToRealPath(mDirectory, mParts[0],
                                     getter_AddRefs(realPath));

  ErrorResult rv;
  RefPtr<FileSystemBase> fs = mDirectory->GetFileSystem(rv);
  if (NS_WARN_IF(rv.Failed())) {
    rv.SuppressException();
    Error(NS_ERROR_DOM_INVALID_STATE_ERR);
    return;
  }

  RefPtr<GetFileOrDirectoryTaskChild> task =
    GetFileOrDirectoryTaskChild::Create(fs, realPath, rv);
  if (NS_WARN_IF(rv.Failed())) {
    rv.SuppressException();
    Error(NS_ERROR_DOM_INVALID_STATE_ERR);
    return;
  }

  task->SetError(error);
  task->Start();

  RefPtr<Promise> promise = task->GetPromise();

  mParts.RemoveElementAt(0);
  promise->AppendNativeHandler(this);
}

void
GetEntryHelper::ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue)
{
  if(NS_WARN_IF(!aValue.isObject())) {
    return;
  }

  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());

  // This is not the last part of the path.
  if (!mParts.IsEmpty()) {
    ContinueRunning(obj);
    return;
  }

  CompleteOperation(obj);
}

void
GetEntryHelper::CompleteOperation(JSObject* aObj)
{
  MOZ_ASSERT(mParts.IsEmpty());

  if (mType == FileSystemDirectoryEntry::eGetFile) {
    RefPtr<File> file;
    if (NS_FAILED(UNWRAP_OBJECT(File, aObj, file))) {
      Error(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
      return;
    }

    RefPtr<FileSystemFileEntry> entry =
      new FileSystemFileEntry(mParentEntry->GetParentObject(), file,
                              mParentEntry, mFileSystem);
    mSuccessCallback->HandleEvent(*entry);
    return;
  }

  MOZ_ASSERT(mType == FileSystemDirectoryEntry::eGetDirectory);

  RefPtr<Directory> directory;
  if (NS_FAILED(UNWRAP_OBJECT(Directory, aObj, directory))) {
    Error(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
    return;
  }

  RefPtr<FileSystemDirectoryEntry> entry =
    new FileSystemDirectoryEntry(mParentEntry->GetParentObject(), directory,
                                 mParentEntry, mFileSystem);
  mSuccessCallback->HandleEvent(*entry);
}

void
GetEntryHelper::ContinueRunning(JSObject* aObj)
{
  MOZ_ASSERT(!mParts.IsEmpty());

  RefPtr<Directory> directory;
  if (NS_FAILED(UNWRAP_OBJECT(Directory, aObj, directory))) {
    Error(NS_ERROR_DOM_TYPE_MISMATCH_ERR);
    return;
  }

  RefPtr<FileSystemDirectoryEntry> entry =
    new FileSystemDirectoryEntry(mParentEntry->GetParentObject(), directory,
                                 mParentEntry, mFileSystem);

  // Update the internal values.
  mParentEntry = entry;
  mDirectory = directory;

  Run();
}

void
GetEntryHelper::RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue)
{
  Error(NS_ERROR_DOM_NOT_FOUND_ERR);
}

void
GetEntryHelper::Error(nsresult aError)
{
  MOZ_ASSERT(NS_FAILED(aError));

  if (mErrorCallback) {
    RefPtr<ErrorCallbackRunnable> runnable =
      new ErrorCallbackRunnable(mParentEntry->GetParentObject(),
                                mErrorCallback, aError);
    DebugOnly<nsresult> rv = NS_DispatchToMainThread(runnable);
    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToMainThread failed");
  }
}

NS_IMPL_ISUPPORTS0(GetEntryHelper);

/* static */ void
FileSystemEntryCallbackHelper::Call(const Optional<OwningNonNull<FileSystemEntryCallback>>& aEntryCallback,
                                    FileSystemEntry* aEntry)
{
  MOZ_ASSERT(aEntry);

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

    DebugOnly<nsresult> rv = NS_DispatchToMainThread(runnable);
    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToMainThread failed");
  }
}

/* static */ void
ErrorCallbackHelper::Call(nsIGlobalObject* aGlobal,
                          const Optional<OwningNonNull<ErrorCallback>>& aErrorCallback,
                          nsresult aError)
{
  MOZ_ASSERT(aGlobal);
  MOZ_ASSERT(NS_FAILED(aError));

  if (aErrorCallback.WasPassed()) {
    RefPtr<ErrorCallbackRunnable> runnable =
      new ErrorCallbackRunnable(aGlobal, &aErrorCallback.Value(), aError);
    DebugOnly<nsresult> rv = NS_DispatchToMainThread(runnable);
    NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "NS_DispatchToMainThread failed");
  }
}

} // dom namespace
} // mozilla namespace

