// This source code is dual-licensed under the Mozilla Public License ("MPL"),
// version 1.1 and the Apache License ("ASL"), version 2.0.
//
// The ASL v2.0:
//
// ---------------------------------------------------------------------------
// Copyright 2016 Pivotal Software, Inc.
//
// 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.
// ---------------------------------------------------------------------------
//
// The MPL v1.1:
//
// ---------------------------------------------------------------------------
// The contents of this file are subject to the Mozilla Public License
// Version 1.1 (the "License"); you may not use this file except in
// compliance with the License. You may obtain a copy of the License at
// https://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS"
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
// License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is RabbitMQ
//
// The Initial Developer of the Original Code is Pivotal Software, Inc.
// All Rights Reserved.
//
// Alternatively, the contents of this file may be used under the terms
// of the Apache Standard license (the "ASL License"), in which case the
// provisions of the ASL License are applicable instead of those
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// under the terms of the ASL License and not to allow others to use
// your version of this file under the MPL, indicate your decision by
// deleting the provisions above and replace them with the notice and
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// under either the MPL or the ASL License.
// ---------------------------------------------------------------------------

#import "RMQConfirmationTransaction.h"

@interface RMQConfirmationTransaction ()
@property (nonatomic, strong) RMQConfirmationCallback callback;
@property (nonatomic, strong) id<RMQLocalSerialQueue> delayQueue;
@property (nonatomic, assign) BOOL isComplete;
@end

@implementation RMQConfirmationTransaction

- (instancetype)initWithDelayQueue:(id<RMQLocalSerialQueue>)queue {
    self = [super init];
    if (self) {
        self.isComplete = NO;
        self.callback = nil;
        self.unconfirmed = [NSMutableSet new];
        self.confirmedAcks = [NSMutableSet new];
        self.confirmedNacks = [NSMutableSet new];
        self.delayQueue = queue;
    }
    return self;
}

- (void)setCallback:(RMQConfirmationCallback)callback
            timeout:(NSNumber *)timeoutInSecs {
    self.callback = callback;
    [self.delayQueue delayedBy:timeoutInSecs enqueue:^{
        for (NSNumber *tag in self.unconfirmed) {
            [self.confirmedNacks addObject:tag];
        }
        [self complete];
    }];
}

- (void)addUnconfirmed:(NSNumber *)tag {
    [self.unconfirmed addObject:tag];
}

- (BOOL)isUnconfirmed:(NSNumber *)tag {
    return [self.unconfirmed containsObject:tag];
}

- (void)ack:(NSNumber *)tag {
    [self.unconfirmed removeObject:tag];
    [self.confirmedAcks addObject:tag];
    [self completeIfReady];
}

- (void)nack:(NSNumber *)tag {
    [self.unconfirmed removeObject:tag];
    [self.confirmedNacks addObject:tag];
    [self completeIfReady];
}

- (void)completeIfReady {
    if (self.callback &&
        self.unconfirmed.count == 0 &&
        (self.confirmedAcks.count > 0 || self.confirmedNacks.count > 0)) {
        [self complete];
    }
}

# pragma mark - Private

- (void)complete {
    if (self.isComplete) return;
    self.callback(self.confirmedAcks, self.confirmedNacks);
    self.isComplete = YES;
}

@end