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// Copyright 2019 Google
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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 "Crashlytics/Crashlytics/Operations/FIRCLSAsyncOperation.h"
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@interface FIRCLSAsyncOperation () {
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  BOOL _internalExecuting;
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  BOOL _internalFinished;
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}
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@property(nonatomic, strong) NSRecursiveLock *lock;
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@end
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@implementation FIRCLSAsyncOperation
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- (instancetype)init {
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  self = [super init];
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  if (!self) {
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    return nil;
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  }
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  _internalExecuting = NO;
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  _internalFinished = NO;
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  self.lock = [[NSRecursiveLock alloc] init];
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  self.lock.name = @"com.crashlytics.async-operation-lock";
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  return self;
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}
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#pragma mark - NSOperation Overrides
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- (BOOL)isConcurrent {
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  return YES;
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}
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- (BOOL)isAsynchronous {
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  return YES;
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}
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- (BOOL)isExecuting {
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  [self.lock lock];
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  BOOL result = _internalExecuting;
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  [self.lock unlock];
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  return result;
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}
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- (BOOL)isFinished {
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  [self.lock lock];
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  BOOL result = _internalFinished;
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  [self.lock unlock];
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  return result;
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}
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- (void)start {
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  if ([self checkForCancellation]) {
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    return;
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  }
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  [self markStarted];
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  [self main];
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}
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#pragma mark - Utilities
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- (void)changeValueForKey:(NSString *)key inBlock:(void (^)(void))block {
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  [self willChangeValueForKey:key];
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  block();
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  [self didChangeValueForKey:key];
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}
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- (void)lock:(void (^)(void))block {
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  [self.lock lock];
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  block();
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  [self.lock unlock];
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}
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- (BOOL)checkForCancellation {
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  if ([self isCancelled]) {
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    [self markDone];
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    return YES;
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  }
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  return NO;
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}
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#pragma mark - State Management
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- (void)unlockedMarkFinished {
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  [self changeValueForKey:@"isFinished"
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                  inBlock:^{
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                    self->_internalFinished = YES;
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                  }];
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}
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- (void)unlockedMarkStarted {
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  [self changeValueForKey:@"isExecuting"
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                  inBlock:^{
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                    self->_internalExecuting = YES;
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                  }];
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}
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- (void)unlockedMarkComplete {
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  [self changeValueForKey:@"isExecuting"
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                  inBlock:^{
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                    self->_internalExecuting = NO;
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                  }];
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}
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- (void)markStarted {
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  [self lock:^{
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    [self unlockedMarkStarted];
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  }];
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}
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- (void)markDone {
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  [self lock:^{
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    [self unlockedMarkComplete];
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    [self unlockedMarkFinished];
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  }];
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}
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@end