// Copyright (c) 2013 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_PROFILE_RESETTER_RESETTABLE_SETTINGS_SNAPSHOT_H_
#define CHROME_BROWSER_PROFILE_RESETTER_RESETTABLE_SETTINGS_SNAPSHOT_H_

#include <string>
#include <utility>
#include <vector>

#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/strings/string_split.h"
#include "chrome/browser/prefs/session_startup_pref.h"
#include "chrome/browser/profile_resetter/profile_resetter.h"

namespace base {
class ListValue;
}
namespace reset_report {
class ChromeResetReport;
}

// ResettableSettingsSnapshot captures some settings values at constructor. It
// can calculate the difference between two snapshots. That is, modified fields.
class ResettableSettingsSnapshot {
 public:
  // ExtensionList is a vector of pairs. The first component is the extension
  // id, the second is the name.
  typedef base::StringPairs ExtensionList;
  // All types of settings handled by this class.
  enum Field {
    STARTUP_MODE = 1 << 0,
    HOMEPAGE = 1 << 1,
    DSE_URL = 1 << 2,
    EXTENSIONS = 1 << 3,
    SHORTCUTS = 1 << 4,

    ALL_FIELDS = STARTUP_MODE | HOMEPAGE | DSE_URL | EXTENSIONS | SHORTCUTS,
  };

  explicit ResettableSettingsSnapshot(Profile* profile);
  ~ResettableSettingsSnapshot();

  // Getters.
  const std::vector<GURL>& startup_urls() const { return startup_.urls; }

  SessionStartupPref::Type startup_type() const { return startup_.type; }

  const std::string& homepage() const { return homepage_; }

  bool homepage_is_ntp() const { return homepage_is_ntp_; }

  bool show_home_button() const { return show_home_button_; }

  const std::string& dse_url() const { return dse_url_; }

  const ExtensionList& enabled_extensions() const {
    return enabled_extensions_;
  }

  const std::vector<ShortcutCommand>& shortcuts() const {
    return shortcuts_;
  }

  bool shortcuts_determined() const {
    return shortcuts_determined_;
  }

  std::string guid() const { return guid_; }

  // Substitutes |enabled_extensions_| with
  // |enabled_extensions_|\|snapshot.enabled_extensions_|.
  void Subtract(const ResettableSettingsSnapshot& snapshot);

  // For each member 'm' compares |this->m| with |snapshot.m| and sets the
  // corresponding |ResetableSettingsSnapshot::Field| bit to 1 in case of
  // difference.
  // The return value is a bit mask of Field values signifying which members
  // were different.
  int FindDifferentFields(const ResettableSettingsSnapshot& snapshot) const;

  // Collects the shortcuts asynchronously and calls |callback|. If the request
  // has been made already, noop.
  void RequestShortcuts(const base::Closure& callback);

 private:
  // Fills the |shortcuts_| member and calls |callback|.
  void SetShortcutsAndReport(
      const base::Closure& callback,
      const std::vector<ShortcutCommand>& shortcuts);

  // Every ResettableSettingsSnapshot instance gets a randomly created GUID.
  std::string guid_;

  // Startup pages. URLs are always stored sorted.
  SessionStartupPref startup_;

  std::string homepage_;
  bool homepage_is_ntp_;
  bool show_home_button_;

  // Default search engine.
  std::string dse_url_;

  // List of pairs [id, name] for enabled extensions. Always sorted.
  ExtensionList enabled_extensions_;

  // Chrome shortcuts (e.g. icons on the Windows desktop, etc.) with non-empty
  // arguments.
  std::vector<ShortcutCommand> shortcuts_;

  // |shortcuts_| were retrieved.
  bool shortcuts_determined_;

  // The flag to cancel shortcuts retrieving.
  scoped_refptr<SharedCancellationFlag> cancellation_flag_;

  base::WeakPtrFactory<ResettableSettingsSnapshot> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(ResettableSettingsSnapshot);
};

// Serializes specified |snapshot| members to a protobuf. |field_mask| is a bit
// mask of ResettableSettingsSnapshot::Field values.
scoped_ptr<reset_report::ChromeResetReport> SerializeSettingsReportToProto(
    const ResettableSettingsSnapshot& snapshot,
    int field_mask);

// Sends |report| as a feedback. |report| is supposed to be result of
// SerializeSettingsReportToProto().
void SendSettingsFeedbackProto(const reset_report::ChromeResetReport& report,
                               Profile* profile);

// Returns list of key/value pairs for all available reported information
// from the |profile| and some additional fields.
scoped_ptr<base::ListValue> GetReadableFeedbackForSnapshot(
    Profile* profile,
    const ResettableSettingsSnapshot& snapshot);

#endif  // CHROME_BROWSER_PROFILE_RESETTER_RESETTABLE_SETTINGS_SNAPSHOT_H_