// Copyright (c) 2011 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.

#include "chrome/browser/sync/api/sync_change.h"

#include <ostream>

SyncChange::SyncChange() : change_type_(ACTION_INVALID) {
}

SyncChange::SyncChange(SyncChangeType change_type, const SyncData& sync_data)
    : change_type_(change_type),
      sync_data_(sync_data) {
  DCHECK(IsValid());
}

SyncChange::~SyncChange() {}

bool SyncChange::IsValid() const {
  if (change_type_ == ACTION_INVALID || !sync_data_.IsValid())
    return false;

  // Data from the syncer must always have specifics.
  if (!sync_data_.IsLocal())
    return (sync_data_.GetDataType() != syncable::UNSPECIFIED);

  // Local changes must always have a tag.
  if (sync_data_.GetTag().empty())
    return false;

  // Adds and updates must have valid specifics (checked by GetDataType())
  if (change_type_ == ACTION_ADD || change_type_ == ACTION_UPDATE)
    return (sync_data_.GetDataType() != syncable::UNSPECIFIED &&
            !sync_data_.GetTitle().empty());

  return true;
}

SyncChange::SyncChangeType SyncChange::change_type() const {
  return change_type_;
}

SyncData SyncChange::sync_data() const {
  return sync_data_;
}

// static
std::string SyncChange::ChangeTypeToString(SyncChangeType change_type) {
  switch (change_type) {
    case ACTION_INVALID:
      return "ACTION_INVALID";
    case ACTION_ADD:
      return "ACTION_ADD";
    case ACTION_UPDATE:
      return "ACTION_UPDATE";
    case ACTION_DELETE:
      return "ACTION_DELETE";
    default:
      NOTREACHED();
  }
  return std::string();
}

std::string SyncChange::ToString() const {
  return "{ changeType: " + ChangeTypeToString(change_type_) +
      ", syncData: " + sync_data_.ToString() + "}";
}

void PrintTo(const SyncChange& sync_change, std::ostream* os) {
  *os << sync_change.ToString();
}