// Copyright 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_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_
#define CHROME_BROWSER_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_

#include <jni.h>
#include <string>

#include "base/android/jni_helper.h"
#include "base/callback.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "chrome/browser/signin/profile_oauth2_token_service.h"
#include "google_apis/gaia/google_service_auth_error.h"

// A specialization of ProfileOAuth2TokenService that will be returned by
// ProfileOAuth2TokenServiceFactory for OS_ANDROID.  This instance uses
// native Android features to lookup OAuth2 tokens.
//
// See |ProfileOAuth2TokenService| for usage details.
//
// Note: requests should be started from the UI thread. To start a
// request from other thread, please use ProfileOAuth2TokenServiceRequest.
class AndroidProfileOAuth2TokenService : public ProfileOAuth2TokenService {
 public:
  // Registers the AndroidProfileOAuth2TokenService's native methods through
  // JNI.
  static bool Register(JNIEnv* env);

  // Creates a new instance of the AndroidProfileOAuth2TokenService.
  static AndroidProfileOAuth2TokenService* Create();

  // Returns a reference to the Java instance of this service.
  static jobject GetForProfile(
      JNIEnv* env, jclass clazz, jobject j_profile_android);

  virtual bool RefreshTokenIsAvailable(
      const std::string& account_id) OVERRIDE;

  // Lists account IDs of all accounts with a refresh token.
  virtual std::vector<std::string> GetAccounts() OVERRIDE;

  void ValidateAccounts(JNIEnv* env,
                        jobject obj,
                        jobjectArray accounts,
                        jstring current_account);

  // Takes a the signed in sync account as well as all the other
  // android account ids and check the token status of each.
  void ValidateAccounts(const std::string& signed_in_account,
                        const std::vector<std::string>& account_ids);

  // Triggers a notification to all observers of the OAuth2TokenService that a
  // refresh token is now available. This may cause observers to retry
  // operations that require authentication.
  virtual void FireRefreshTokenAvailableFromJava(JNIEnv* env,
                                                 jobject obj,
                                                 const jstring account_name);
  // Triggers a notification to all observers of the OAuth2TokenService that a
  // refresh token is now available.
  virtual void FireRefreshTokenRevokedFromJava(JNIEnv* env,
                                               jobject obj,
                                               const jstring account_name);
  // Triggers a notification to all observers of the OAuth2TokenService that all
  // refresh tokens have now been loaded.
  virtual void FireRefreshTokensLoadedFromJava(JNIEnv* env, jobject obj);

 protected:
  friend class ProfileOAuth2TokenServiceFactory;
  AndroidProfileOAuth2TokenService();
  virtual ~AndroidProfileOAuth2TokenService();

  // Overridden from OAuth2TokenService to intercept token fetch requests and
  // redirect them to the Account Manager.
  virtual void FetchOAuth2Token(RequestImpl* request,
                                const std::string& account_id,
                                net::URLRequestContextGetter* getter,
                                const std::string& client_id,
                                const std::string& client_secret,
                                const ScopeSet& scopes) OVERRIDE;

  // Overridden from OAuth2TokenService to intercept token fetch requests and
  // redirect them to the Account Manager.
  virtual void InvalidateOAuth2Token(const std::string& account_id,
                                     const std::string& client_id,
                                     const ScopeSet& scopes,
                                     const std::string& access_token) OVERRIDE;

  // Called to notify observers when a refresh token is available.
  virtual void FireRefreshTokenAvailable(
      const std::string& account_id) OVERRIDE;
  // Called to notify observers when a refresh token has been revoked.
  virtual void FireRefreshTokenRevoked(const std::string& account_id) OVERRIDE;
  // Called to notify observers when refresh tokans have been loaded.
  virtual void FireRefreshTokensLoaded() OVERRIDE;

 private:
  base::android::ScopedJavaGlobalRef<jobject> java_ref_;

  DISALLOW_COPY_AND_ASSIGN(AndroidProfileOAuth2TokenService);
};

#endif  // CHROME_BROWSER_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_