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// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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//      http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "FirebaseABTesting/Sources/Private/ABTExperimentPayload.h"
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static NSString *const kExperimentPayloadKeyExperimentID = @"experimentId";
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static NSString *const kExperimentPayloadKeyVariantID = @"variantId";
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// Start time can either be a date string or integer (milliseconds since 1970).
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static NSString *const kExperimentPayloadKeyExperimentStartTime = @"experimentStartTime";
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static NSString *const kExperimentPayloadKeyExperimentStartTimeMillis =
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    @"experimentStartTimeMillis";
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static NSString *const kExperimentPayloadKeyTriggerEvent = @"triggerEvent";
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static NSString *const kExperimentPayloadKeyTriggerTimeoutMillis = @"triggerTimeoutMillis";
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static NSString *const kExperimentPayloadKeyTimeToLiveMillis = @"timeToLiveMillis";
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static NSString *const kExperimentPayloadKeySetEventToLog = @"setEventToLog";
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static NSString *const kExperimentPayloadKeyActivateEventToLog = @"activateEventToLog";
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static NSString *const kExperimentPayloadKeyClearEventToLog = @"clearEventToLog";
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static NSString *const kExperimentPayloadKeyTimeoutEventToLog = @"timeoutEventToLog";
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static NSString *const kExperimentPayloadKeyTTLExpiryEventToLog = @"ttlExpiryEventToLog";
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static NSString *const kExperimentPayloadKeyOverflowPolicy = @"overflowPolicy";
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static NSString *const kExperimentPayloadValueDiscardOldestOverflowPolicy = @"DISCARD_OLDEST";
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static NSString *const kExperimentPayloadValueIgnoreNewestOverflowPolicy = @"IGNORE_NEWEST";
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static NSString *const kExperimentPayloadKeyOngoingExperiments = @"ongoingExperiments";
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@implementation ABTExperimentLite
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- (instancetype)initWithExperimentId:(NSString *)experimentId {
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  if (self = [super init]) {
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    _experimentId = experimentId;
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  }
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  return self;
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}
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@end
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@implementation ABTExperimentPayload
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+ (NSDateFormatter *)experimentStartTimeFormatter {
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  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
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  [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"];
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  [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
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  // Locale needs to be hardcoded. See
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  // https://developer.apple.com/library/ios/#qa/qa1480/_index.html for more details.
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  [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
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  [dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
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  return dateFormatter;
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}
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+ (nullable instancetype)parseFromData:(NSData *)data {
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  NSError *error;
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  NSDictionary *experimentDictionary =
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      [NSJSONSerialization JSONObjectWithData:data
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                                      options:NSJSONReadingAllowFragments
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                                        error:&error];
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  if (error != nil) {
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    return nil;
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  } else {
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    return [[ABTExperimentPayload alloc] initWithDictionary:experimentDictionary];
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  }
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}
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- (instancetype)initWithDictionary:(NSDictionary<NSString *, id> *)dictionary {
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  if (self = [super init]) {
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    _experimentId = dictionary[kExperimentPayloadKeyExperimentID];
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    _variantId = dictionary[kExperimentPayloadKeyVariantID];
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    _triggerEvent = dictionary[kExperimentPayloadKeyTriggerEvent];
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    _setEventToLog = dictionary[kExperimentPayloadKeySetEventToLog];
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    _activateEventToLog = dictionary[kExperimentPayloadKeyActivateEventToLog];
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    _clearEventToLog = dictionary[kExperimentPayloadKeyClearEventToLog];
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    _timeoutEventToLog = dictionary[kExperimentPayloadKeyTimeoutEventToLog];
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    _ttlExpiryEventToLog = dictionary[kExperimentPayloadKeyTTLExpiryEventToLog];
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    // Experiment start time can either be in the form of a date string or milliseconds since 1970.
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    if (dictionary[kExperimentPayloadKeyExperimentStartTime]) {
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      // Convert from date string.
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      NSDate *experimentStartTime = [[[self class] experimentStartTimeFormatter]
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          dateFromString:dictionary[kExperimentPayloadKeyExperimentStartTime]];
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      _experimentStartTimeMillis =
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          [@([experimentStartTime timeIntervalSince1970] * 1000) longLongValue];
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    } else if (dictionary[kExperimentPayloadKeyExperimentStartTimeMillis]) {
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      // Simply store milliseconds.
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      _experimentStartTimeMillis =
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          [dictionary[kExperimentPayloadKeyExperimentStartTimeMillis] longLongValue];
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      ;
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    }
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    _triggerTimeoutMillis = [dictionary[kExperimentPayloadKeyTriggerTimeoutMillis] longLongValue];
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    _timeToLiveMillis = [dictionary[kExperimentPayloadKeyTimeToLiveMillis] longLongValue];
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    // Overflow policy can be an integer, or string e.g. "DISCARD_OLDEST" or "IGNORE_NEWEST".
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    if ([dictionary[kExperimentPayloadKeyOverflowPolicy] isKindOfClass:[NSString class]]) {
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      // If it's a string, pick against the preset string values.
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      NSString *policy = dictionary[kExperimentPayloadKeyOverflowPolicy];
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      if ([policy isEqualToString:kExperimentPayloadValueDiscardOldestOverflowPolicy]) {
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        _overflowPolicy = ABTExperimentPayloadExperimentOverflowPolicyDiscardOldest;
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      } else if ([policy isEqualToString:kExperimentPayloadValueIgnoreNewestOverflowPolicy]) {
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        _overflowPolicy = ABTExperimentPayloadExperimentOverflowPolicyIgnoreNewest;
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      } else {
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        _overflowPolicy = ABTExperimentPayloadExperimentOverflowPolicyUnrecognizedValue;
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      }
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    } else {
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      _overflowPolicy = [dictionary[kExperimentPayloadKeyOverflowPolicy] intValue];
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    }
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    NSMutableArray<ABTExperimentLite *> *ongoingExperiments = [[NSMutableArray alloc] init];
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    NSArray<NSDictionary<NSString *, NSString *> *> *ongoingExperimentsArray =
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        dictionary[kExperimentPayloadKeyOngoingExperiments];
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    for (NSDictionary<NSString *, NSString *> *experimentDictionary in ongoingExperimentsArray) {
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      NSString *experimentId = experimentDictionary[kExperimentPayloadKeyExperimentID];
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      if (experimentId) {
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        ABTExperimentLite *liteExperiment =
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            [[ABTExperimentLite alloc] initWithExperimentId:experimentId];
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        [ongoingExperiments addObject:liteExperiment];
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      }
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    }
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    _ongoingExperiments = [ongoingExperiments copy];
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  }
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  return self;
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}
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- (void)clearTriggerEvent {
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  _triggerEvent = nil;
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}
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- (BOOL)overflowPolicyIsValid {
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  return self.overflowPolicy == ABTExperimentPayloadExperimentOverflowPolicyIgnoreNewest ||
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         self.overflowPolicy == ABTExperimentPayloadExperimentOverflowPolicyDiscardOldest;
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}
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- (void)setOverflowPolicy:(ABTExperimentPayloadExperimentOverflowPolicy)overflowPolicy {
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  _overflowPolicy = overflowPolicy;
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}
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@end