// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_CHROMEOS_DRIVE_TEST_UTIL_H_
#define CHROME_BROWSER_CHROMEOS_DRIVE_TEST_UTIL_H_

#include <string>

#include "chrome/browser/google_apis/test_util.h"
#include "net/base/completion_callback.h"
#include "net/base/io_buffer.h"
#include "net/base/test_completion_callback.h"

namespace net {
class IOBuffer;
}  // namespace net

namespace drive {

class FileCacheEntry;
class ChangeListLoader;

namespace test_util {

// This is a bitmask of cache states in FileCacheEntry. Used only in tests.
enum TestFileCacheState {
  TEST_CACHE_STATE_NONE       = 0,
  TEST_CACHE_STATE_PINNED     = 1 << 0,
  TEST_CACHE_STATE_PRESENT    = 1 << 1,
  TEST_CACHE_STATE_DIRTY      = 1 << 2,
  TEST_CACHE_STATE_MOUNTED    = 1 << 3,
  TEST_CACHE_STATE_PERSISTENT = 1 << 4,
};

// Converts |cache_state| which is a bit mask of TestFileCacheState, to a
// FileCacheEntry.
FileCacheEntry ToCacheEntry(int cache_state);

// Returns true if the cache state of the given two cache entries are equal.
bool CacheStatesEqual(const FileCacheEntry& a, const FileCacheEntry& b);

// Loads a test json file as root ("/drive") element from a test file stored
// under chrome/test/data/chromeos. Returns true on success.
bool LoadChangeFeed(const std::string& relative_path,
                    ChangeListLoader* change_list_loader,
                    bool is_delta_feed,
                    const std::string& root_resource_id,
                    int64 root_feed_changestamp);

// Helper to destroy objects which needs Destroy() to be called on destruction.
// Note: When using this helper, you should destruct objects before
// BrowserThread.
struct DestroyHelperForTests {
  template<typename T>
  void operator()(T* object) const {
    if (object) {
      object->Destroy();
      google_apis::test_util::RunBlockingPoolTask();  // Finish destruction.
    }
  }
};

// Reads all the data from |reader| and copies to |content|. Returns net::Error
// code.
template<typename Reader>
int ReadAllData(Reader* reader, std::string* content) {
  const int kBufferSize = 10;
  scoped_refptr<net::IOBuffer> buffer(new net::IOBuffer(kBufferSize));
  while (true) {
    net::TestCompletionCallback callback;
    int result = reader->Read(buffer.get(), kBufferSize, callback.callback());
    result = callback.GetResult(result);
    if (result <= 0) {
      // Found an error or EOF. Return it. Note: net::OK is 0.
      return result;
    }
    content->append(buffer->data(), result);
  }
}

}  // namespace test_util
}  // namespace drive

#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_TEST_UTIL_H_