/*
 * Copyright 2010-present Facebook.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#import "FBSession.h"

#if defined (DEBUG)
    #define SAFE_TO_USE_FBTESTSESSION
#endif

#if !defined(SAFE_TO_USE_FBTESTSESSION)
    #pragma message ("warning: using FBTestSession, which is designed for unit-testing uses only, in non-DEBUG code -- ensure this is what you really want")
#endif

/*! 
 Consider using this tag to pass to sessionWithSharedUserWithPermissions:uniqueUserTag: when
 you need a second unique test user in a test case. Using the same tag each time reduces
 the proliferation of test users.
 */
extern NSString *kSecondTestUserTag;
/*! 
 Consider using this tag to pass to sessionWithSharedUserWithPermissions:uniqueUserTag: when
 you need a third unique test user in a test case. Using the same tag each time reduces
 the proliferation of test users.
 */
extern NSString *kThirdTestUserTag;

/*!
 @class FBTestSession
 
 @abstract
 Implements an FBSession subclass that knows about test users for a particular
 application. This should never be used from a real application, but may be useful
 for writing unit tests, etc.
 
 @discussion
 Facebook allows developers to create test accounts for testing their applications'
 Facebook integration (see https://developers.facebook.com/docs/test_users/). This class
 simplifies use of these accounts for writing unit tests. It is not designed for use in
 production application code.
 
 The main use case for this class is using sessionForUnitTestingWithPermissions:mode:
 to create a session for a test user. Two modes are supported. In "shared" mode, an attempt
 is made to find an existing test user that has the required permissions and, if it is not
 currently in use by another FBTestSession, just use that user. If no such user is available,
 a new one is created with the required permissions. In "private" mode, designed for
 scenarios which require a new user in a known clean state, a new test user will always be
 created, and it will be automatically deleted when the FBTestSession is closed.
 
 Note that the shared test user functionality depends on a naming convention for the test users.
 It is important that any testing of functionality which will mutate the permissions for a
 test user NOT use a shared test user, or this scheme will break down. If a shared test user
 seems to be in an invalid state, it can be deleted manually via the Web interface at
 https://developers.facebook.com/apps/APP_ID/permissions?role=test+users.
 */
@interface FBTestSession : FBSession

/// The app access token (composed of app ID and secret) to use for accessing test users.
@property (readonly, copy) NSString *appAccessToken;
/// The ID of the test user associated with this session.
@property (readonly, copy) NSString *testUserID;
/// The App ID of the test app as configured in the plist.
@property (readonly, copy) NSString *testAppID;
/// The App Secret of the test app as configured in the plist.
@property (readonly, copy) NSString *testAppSecret;
// Defaults to NO. If set to YES, reauthorize calls will fail with a nil token
// as if the user had cancelled it reauthorize.
@property (assign) BOOL disableReauthorize;

/*!
 @abstract
 Constructor helper to create a session for use in unit tests
 
 @discussion
 This method creates a session object which uses a shared test user with the right permissions,
 creating one if necessary on open (but not deleting it on close, so it can be re-used in later
 tests). Calling this method multiple times may return sessions with the same user. If this is not
 desired, use the variant sessionWithSharedUserWithPermissions:uniqueUserTag:.
 
 This method should not be used in application code -- but is useful for creating unit tests
 that use the Facebook SDK.
 
 @param permissions     array of strings naming permissions to authorize; nil indicates 
 a common default set of permissions should be used for unit testing
  */
+ (id)sessionWithSharedUserWithPermissions:(NSArray*)permissions;

/*!
 @abstract
 Constructor helper to create a session for use in unit tests
 
 @discussion
 This method creates a session object which uses a shared test user with the right permissions,
 creating one if necessary on open (but not deleting it on close, so it can be re-used in later
 tests). 
 
 This method should not be used in application code -- but is useful for creating unit tests
 that use the Facebook SDK.
 
 @param permissions     array of strings naming permissions to authorize; nil indicates 
 a common default set of permissions should be used for unit testing
 
 @param uniqueUserTag   a string which will be used to make this user unique among other
 users with the same permissions. Useful for tests which require two or more users to interact
 with each other, and which therefore must have sessions associated with different users. For
 this case, consider using kSecondTestUserTag and kThirdTestUserTag so these users can be shared
 with other, similar, tests.
 */
+ (id)sessionWithSharedUserWithPermissions:(NSArray*)permissions 
                             uniqueUserTag:(NSString*)uniqueUserTag;

/*!
 @abstract
 Constructor helper to create a session for use in unit tests
 
 @discussion
 This method creates a session object which creates a test user on open, and destroys the user on
 close; This method should not be used in application code -- but is useful for creating unit tests
 that use the Facebook SDK.
 
 @param permissions     array of strings naming permissions to authorize; nil indicates 
 a common default set of permissions should be used for unit testing
 */
+ (id)sessionWithPrivateUserWithPermissions:(NSArray*)permissions;

@end
