/*
 * Copyright 2019 Google
 *
 * 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 <OCMock/OCMock.h>
#import <XCTest/XCTest.h>

#import "FirebaseCore/Extension/FirebaseCoreInternal.h"
#import "FirebaseRemoteConfig/Sources/Private/FIRRemoteConfig_Private.h"
#import "FirebaseRemoteConfig/Sources/Private/RCNConfigFetch.h"
#import "FirebaseRemoteConfig/Sources/RCNConfigConstants.h"
#import "FirebaseRemoteConfig/Sources/RCNConfigDBManager.h"
#import "FirebaseRemoteConfig/Sources/RCNConfigValue_Internal.h"
#import "FirebaseRemoteConfig/Sources/RCNPersonalization.h"
#import "FirebaseRemoteConfig/Tests/Unit/RCNTestUtilities.h"
#import "Interop/Analytics/Public/FIRAnalyticsInterop.h"

@interface RCNConfigFetch (ForTest)
- (NSURLSessionDataTask *)URLSessionDataTaskWithContent:(NSData *)content
                                        fetchTypeHeader:(NSString *)fetchTypeHeader
                                      completionHandler:
                                          (RCNConfigFetcherCompletion)fetcherCompletion;

- (void)fetchWithUserProperties:(NSDictionary *)userProperties
                fetchTypeHeader:(NSString *)fetchTypeHeader
              completionHandler:(FIRRemoteConfigFetchCompletion)completionHandler
        updateCompletionHandler:(RCNConfigFetchCompletion)updateCompletionHandler;
@end

@interface RCNPersonalizationTest : XCTestCase {
  NSDictionary *_configContainer;
  NSMutableArray<NSDictionary *> *_fakeLogs;
  id _analyticsMock;
  RCNPersonalization *_personalization;
  FIRRemoteConfig *_configInstance;
}
@end

@implementation RCNPersonalizationTest
- (void)setUp {
  [super setUp];

  _configContainer = @{
    RCNFetchResponseKeyEntries : @{
      @"key1" : [[FIRRemoteConfigValue alloc]
          initWithData:[@"value1" dataUsingEncoding:NSUTF8StringEncoding]
                source:FIRRemoteConfigSourceRemote],
      @"key2" : [[FIRRemoteConfigValue alloc]
          initWithData:[@"value2" dataUsingEncoding:NSUTF8StringEncoding]
                source:FIRRemoteConfigSourceRemote],
      @"key3" : [[FIRRemoteConfigValue alloc]
          initWithData:[@"value3" dataUsingEncoding:NSUTF8StringEncoding]
                source:FIRRemoteConfigSourceRemote]
    },
    RCNFetchResponseKeyPersonalizationMetadata : @{
      @"key1" : @{
        kPersonalizationId : @"p13n1",
        kArmIndex : @0,
        kChoiceId : @"id1",
        kGroup : @"BASELINE"
      },
      @"key2" :
          @{kPersonalizationId : @"p13n2", kArmIndex : @1, kChoiceId : @"id2", kGroup : @"P13N"}
    }
  };

  _fakeLogs = [[NSMutableArray alloc] init];
  _analyticsMock = OCMProtocolMock(@protocol(FIRAnalyticsInterop));
  OCMStub([_analyticsMock logEventWithOrigin:kAnalyticsOriginPersonalization
                                        name:[OCMArg isKindOfClass:[NSString class]]
                                  parameters:[OCMArg isKindOfClass:[NSDictionary class]]])
      .andDo(^(NSInvocation *invocation) {
        __unsafe_unretained NSDictionary *bundle;
        [invocation getArgument:&bundle atIndex:4];
        [self->_fakeLogs addObject:bundle];
      });

  _personalization = [[RCNPersonalization alloc] initWithAnalytics:_analyticsMock];

  // Always remove the database at the start of testing.
  NSString *DBPath = [RCNTestUtilities remoteConfigPathForTestDatabase];
  id DBMock = OCMClassMock([RCNConfigDBManager class]);
  OCMStub([DBMock remoteConfigPathForDatabase]).andReturn(DBPath);

  RCNConfigContent *configContent = [[RCNConfigContent alloc] initWithDBManager:DBMock];

  // Create a mock FIRRemoteConfig instance.
  _configInstance = OCMPartialMock([[FIRRemoteConfig alloc]
      initWithAppName:@"testApp"
           FIROptions:[[FIROptions alloc] initWithGoogleAppID:@"1:123:ios:test"
                                                  GCMSenderID:@"testSender"]
            namespace:@"namespace"
            DBManager:DBMock
        configContent:configContent
            analytics:_analyticsMock]);
  [_configInstance setValue:[RCNPersonalizationTest mockFetchRequest] forKey:@"_configFetch"];
}

- (void)tearDown {
  [super tearDown];
}

- (void)testNonPersonalizationKey {
  [_fakeLogs removeAllObjects];

  [_personalization logArmActive:@"key3" config:_configContainer];

  OCMVerify(never(),
            [_analyticsMock logEventWithOrigin:kAnalyticsOriginPersonalization
                                          name:[OCMArg checkWithBlock:^BOOL(NSString *value) {
                                            return [value isEqualToString:kExternalEvent] ||
                                                   [value isEqualToString:kInternalEvent];
                                          }]
                                    parameters:[OCMArg isKindOfClass:[NSDictionary class]]]);
  XCTAssertEqual([_fakeLogs count], 0);
}

- (void)testSinglePersonalizationKey {
  [_fakeLogs removeAllObjects];

  [_personalization logArmActive:@"key1" config:_configContainer];

  OCMVerify(times(2),
            [_analyticsMock logEventWithOrigin:kAnalyticsOriginPersonalization
                                          name:[OCMArg checkWithBlock:^BOOL(NSString *value) {
                                            return [value isEqualToString:kExternalEvent] ||
                                                   [value isEqualToString:kInternalEvent];
                                          }]
                                    parameters:[OCMArg isKindOfClass:[NSDictionary class]]]);
  XCTAssertEqual([_fakeLogs count], 2);

  NSDictionary *logParams = @{
    kExternalRcParameterParam : @"key1",
    kExternalArmValueParam : @"value1",
    kExternalPersonalizationIdParam : @"p13n1",
    kExternalArmIndexParam : @0,
    kExternalGroupParam : @"BASELINE"
  };
  XCTAssertEqualObjects(_fakeLogs[0], logParams);

  NSDictionary *internalLogParams = @{kInternalChoiceIdParam : @"id1"};
  XCTAssertEqualObjects(_fakeLogs[1], internalLogParams);
}

- (void)testMultiplePersonalizationKeys {
  [_fakeLogs removeAllObjects];

  [_personalization logArmActive:@"key1" config:_configContainer];
  [_personalization logArmActive:@"key2" config:_configContainer];
  [_personalization logArmActive:@"key1" config:_configContainer];

  OCMVerify(times(4),
            [_analyticsMock logEventWithOrigin:kAnalyticsOriginPersonalization
                                          name:[OCMArg checkWithBlock:^BOOL(NSString *value) {
                                            return [value isEqualToString:kExternalEvent] ||
                                                   [value isEqualToString:kInternalEvent];
                                          }]
                                    parameters:[OCMArg isKindOfClass:[NSDictionary class]]]);
  XCTAssertEqual([_fakeLogs count], 4);

  NSDictionary *logParams1 = @{
    kExternalRcParameterParam : @"key1",
    kExternalArmValueParam : @"value1",
    kExternalPersonalizationIdParam : @"p13n1",
    kExternalArmIndexParam : @0,
    kExternalGroupParam : @"BASELINE"
  };
  XCTAssertEqualObjects(_fakeLogs[0], logParams1);

  NSDictionary *internalLogParams1 = @{kInternalChoiceIdParam : @"id1"};
  XCTAssertEqualObjects(_fakeLogs[1], internalLogParams1);

  NSDictionary *logParams2 = @{
    kExternalRcParameterParam : @"key2",
    kExternalArmValueParam : @"value2",
    kExternalPersonalizationIdParam : @"p13n2",
    kExternalArmIndexParam : @1,
    kExternalGroupParam : @"P13N"
  };
  XCTAssertEqualObjects(_fakeLogs[2], logParams2);

  NSDictionary *internalLogParams2 = @{kInternalChoiceIdParam : @"id2"};
  XCTAssertEqualObjects(_fakeLogs[3], internalLogParams2);
}

/// Server-provided personalization metadata missing optional fields must not insert nil values
/// into the Analytics parameters (see #16728).
- (void)testPersonalizationMetadataWithMissingFieldsDoesNotCrash {
  [_fakeLogs removeAllObjects];
  NSDictionary *config = @{
    RCNFetchResponseKeyEntries : _configContainer[RCNFetchResponseKeyEntries],
    RCNFetchResponseKeyPersonalizationMetadata : @{@"key1" : @{kChoiceId : @"id1"}}
  };

  XCTAssertNoThrow([_personalization logArmActive:@"key1" config:config]);

  XCTAssertEqual([_fakeLogs count], 2);
  NSDictionary *logParams =
      @{kExternalRcParameterParam : @"key1", kExternalArmValueParam : @"value1"};
  XCTAssertEqualObjects(_fakeLogs[0], logParams);
  XCTAssertEqualObjects(_fakeLogs[1], @{kInternalChoiceIdParam : @"id1"});
}

/// Personalization metadata of the wrong type must be ignored without crashing.
- (void)testPersonalizationMetadataWithWrongTypesIsIgnored {
  [_fakeLogs removeAllObjects];
  NSDictionary *entries = _configContainer[RCNFetchResponseKeyEntries];
  NSArray *malformedMetadata = @[
    @"not a dictionary", @[ @"key1" ], [NSNull null], @{@"key1" : @"not a dictionary"},
    @{@"key1" : [NSNull null]}, @{@"key1" : @[ @"id1" ]}
  ];
  for (id metadata in malformedMetadata) {
    NSDictionary *config = @{
      RCNFetchResponseKeyEntries : entries,
      RCNFetchResponseKeyPersonalizationMetadata : metadata
    };
    XCTAssertNoThrow([_personalization logArmActive:@"key1" config:config]);
  }
  NSDictionary *config = @{
    RCNFetchResponseKeyEntries : @"not a dictionary",
    RCNFetchResponseKeyPersonalizationMetadata :
        _configContainer[RCNFetchResponseKeyPersonalizationMetadata]
  };
  XCTAssertNoThrow([_personalization logArmActive:@"key1" config:config]);

  XCTAssertEqual([_fakeLogs count], 0);
}

/// JSON null parses as NSNull, which must not be logged as a choice ID or event parameter.
- (void)testPersonalizationMetadataWithNullOrWrongTypeFieldsIsIgnored {
  [_fakeLogs removeAllObjects];
  NSDictionary *entries = _configContainer[RCNFetchResponseKeyEntries];

  // Nothing is logged without a string choice ID.
  for (id choiceId in @[ [NSNull null], @1, @[ @"id1" ] ]) {
    NSDictionary *config = @{
      RCNFetchResponseKeyEntries : entries,
      RCNFetchResponseKeyPersonalizationMetadata : @{@"key1" : @{kChoiceId : choiceId}}
    };
    XCTAssertNoThrow([_personalization logArmActive:@"key1" config:config]);
  }
  XCTAssertEqual([_fakeLogs count], 0);

  // Optional fields that are null or have the wrong type are omitted.
  NSDictionary *config = @{
    RCNFetchResponseKeyEntries : entries,
    RCNFetchResponseKeyPersonalizationMetadata : @{
      @"key1" : @{
        kChoiceId : @"id1",
        kPersonalizationId : [NSNull null],
        kArmIndex : [NSNull null],
        kGroup : [NSNull null]
      },
      @"key2" : @{kChoiceId : @"id2", kPersonalizationId : @2, kArmIndex : @"1", kGroup : @[]}
    }
  };
  XCTAssertNoThrow([_personalization logArmActive:@"key1" config:config]);
  XCTAssertNoThrow([_personalization logArmActive:@"key2" config:config]);

  XCTAssertEqual([_fakeLogs count], 4);
  NSDictionary *logParams1 =
      @{kExternalRcParameterParam : @"key1", kExternalArmValueParam : @"value1"};
  XCTAssertEqualObjects(_fakeLogs[0], logParams1);
  XCTAssertEqualObjects(_fakeLogs[1], @{kInternalChoiceIdParam : @"id1"});
  NSDictionary *logParams2 =
      @{kExternalRcParameterParam : @"key2", kExternalArmValueParam : @"value2"};
  XCTAssertEqualObjects(_fakeLogs[2], logParams2);
  XCTAssertEqualObjects(_fakeLogs[3], @{kInternalChoiceIdParam : @"id2"});
}

- (void)testRemoteConfigIntegration {
  [_fakeLogs removeAllObjects];

  FIRRemoteConfigFetchAndActivateCompletion fetchAndActivateCompletion =
      ^void(FIRRemoteConfigFetchAndActivateStatus status, NSError *error) {
        OCMVerify(times(4), [self->_analyticsMock
                                logEventWithOrigin:kAnalyticsOriginPersonalization
                                              name:[OCMArg checkWithBlock:^BOOL(NSString *value) {
                                                return [value isEqualToString:kExternalEvent] ||
                                                       [value isEqualToString:kInternalEvent];
                                              }]
                                        parameters:[OCMArg isKindOfClass:[NSDictionary class]]]);
        XCTAssertEqual([self->_fakeLogs count], 4);

        NSDictionary *logParams1 = @{
          kExternalRcParameterParam : @"key1",
          kExternalArmValueParam : @"value1",
          kExternalPersonalizationIdParam : @"p13n1",
          kExternalArmIndexParam : @0,
          kExternalGroupParam : @"BASELINE"
        };
        XCTAssertEqualObjects(self->_fakeLogs[0], logParams1);

        NSDictionary *internalLogParams1 = @{kInternalChoiceIdParam : @"id1"};
        XCTAssertEqualObjects(self->_fakeLogs[1], internalLogParams1);

        NSDictionary *logParams2 = @{
          kExternalRcParameterParam : @"key1",
          kExternalArmValueParam : @"value1",
          kExternalPersonalizationIdParam : @"p13n1",
          kExternalArmIndexParam : @0,
          kExternalGroupParam : @"BASELINE"
        };
        XCTAssertEqualObjects(self->_fakeLogs[2], logParams2);

        NSDictionary *internalLogParams2 = @{kInternalChoiceIdParam : @"id2"};
        XCTAssertEqualObjects(self->_fakeLogs[3], internalLogParams2);
      };

  [_configInstance fetchAndActivateWithCompletionHandler:fetchAndActivateCompletion];
  [_configInstance configValueForKey:@"key1"];
  [_configInstance configValueForKey:@"key2"];
}

+ (id)mockFetchRequest {
  id configFetch = OCMClassMock([RCNConfigFetch class]);
  OCMStub([configFetch fetchConfigWithExpirationDuration:0 completionHandler:OCMOCK_ANY])
      .ignoringNonObjectArgs()
      .andDo(^(NSInvocation *invocation) {
        __unsafe_unretained FIRRemoteConfigFetchCompletion handler;
        [invocation getArgument:&handler atIndex:3];
        [configFetch fetchWithUserProperties:[[NSDictionary alloc] init]
                             fetchTypeHeader:@"Base/1"
                           completionHandler:handler
                     updateCompletionHandler:nil];
      });
  OCMExpect([configFetch
                URLSessionDataTaskWithContent:[OCMArg any]
                              fetchTypeHeader:@"Base/1"
                            completionHandler:[RCNPersonalizationTest mockResponseHandler]])
      .andReturn(nil);
  return configFetch;
}

+ (id)mockResponseHandler {
  NSDictionary *response = @{
    RCNFetchResponseKeyState : RCNFetchResponseKeyStateUpdate,
    RCNFetchResponseKeyEntries : @{@"key1" : @"value1", @"key2" : @"value2", @"key3" : @"value3"},
    RCNFetchResponseKeyPersonalizationMetadata : @{
      @"key1" : @{
        kPersonalizationId : @"p13n1",
        kArmIndex : @0,
        kChoiceId : @"id1",
        kGroup : @"BASELINE"
      },
      @"key2" :
          @{kPersonalizationId : @"p13n2", kArmIndex : @1, kChoiceId : @"id2", kGroup : @"P13N"}
    }

  };
  return [OCMArg invokeBlockWithArgs:[NSJSONSerialization dataWithJSONObject:response
                                                                     options:0
                                                                       error:nil],
                                     [[NSHTTPURLResponse alloc]
                                          initWithURL:[NSURL URLWithString:@"https://firebase.com"]
                                           statusCode:200
                                          HTTPVersion:nil
                                         headerFields:@{@"etag" : @"etag1"}],
                                     [NSNull null], nil];
}

@end