//
//  RACSequenceExamples.m
//  ReactiveCocoa
//
//  Created by Justin Spahr-Summers on 2012-11-01.
//  Copyright (c) 2012 GitHub, Inc. All rights reserved.
//

#import <Quick/Quick.h>
#import <Nimble/Nimble.h>

#import "RACSequenceExamples.h"

#import "RACScheduler.h"
#import "RACSequence.h"
#import "RACSignal+Operations.h"

NSString * const RACSequenceExamples = @"RACSequenceExamples";
NSString * const RACSequenceExampleSequence = @"RACSequenceExampleSequence";
NSString * const RACSequenceExampleExpectedValues = @"RACSequenceExampleExpectedValues";

QuickConfigurationBegin(RACSequenceExampleGroups)

+ (void)configure:(Configuration *)configuration {
	sharedExamples(RACSequenceExamples, ^(QCKDSLSharedExampleContext exampleContext) {
		__block RACSequence *sequence;
		__block NSArray *values;

		qck_beforeEach(^{
			sequence = exampleContext()[RACSequenceExampleSequence];
			values = [exampleContext()[RACSequenceExampleExpectedValues] copy];
		});

		qck_it(@"should implement <NSFastEnumeration>", ^{
			NSMutableArray *collectedValues = [NSMutableArray array];
			for (id value in sequence) {
				[collectedValues addObject:value];
			}

			expect(collectedValues).to(equal(values));
		});

		qck_it(@"should return an array", ^{
			expect(sequence.array).to(equal(values));
		});

		qck_describe(@"-signalWithScheduler:", ^{
			qck_it(@"should return an immediately scheduled signal", ^{
				RACSignal *signal = [sequence signalWithScheduler:RACScheduler.immediateScheduler];
				expect(signal.toArray).to(equal(values));
			});

			qck_it(@"should return a background scheduled signal", ^{
				RACSignal *signal = [sequence signalWithScheduler:[RACScheduler scheduler]];
				expect(signal.toArray).to(equal(values));
			});

			qck_it(@"should only evaluate one value per scheduling", ^{
				RACScheduler* scheduler = [RACScheduler schedulerWithPriority:RACSchedulerPriorityHigh];
				RACSignal *signal = [sequence signalWithScheduler:scheduler];

				__block BOOL flag = YES;
				__block BOOL completed = NO;
				[signal subscribeNext:^(id x) {
					expect(@(flag)).to(beTruthy());
					flag = NO;

					[scheduler schedule:^{
						// This should get executed before the next value (which
						// verifies that it's YES).
						flag = YES;
					}];
				} completed:^{
					completed = YES;
				}];

				expect(@(completed)).toEventually(beTruthy());
			});
		});

		qck_it(@"should be equal to itself", ^{
			expect(sequence).to(equal(sequence));
		});

		qck_it(@"should be equal to the same sequence of values", ^{
			RACSequence *newSequence = RACSequence.empty;
			for (id value in values) {
				RACSequence *valueSeq = [RACSequence return:value];
				expect(valueSeq).notTo(beNil());

				newSequence = [newSequence concat:valueSeq];
			}

			expect(sequence).to(equal(newSequence));
			expect(@(sequence.hash)).to(equal(@(newSequence.hash)));
		});

		qck_it(@"should not be equal to a different sequence of values", ^{
			RACSequence *anotherSequence = [RACSequence return:@(-1)];
			expect(sequence).notTo(equal(anotherSequence));
		});

		qck_it(@"should return an identical object for -copy", ^{
			expect([sequence copy]).to(beIdenticalTo(sequence));
		});

		qck_it(@"should archive", ^{
			NSData *data = [NSKeyedArchiver archivedDataWithRootObject:sequence];
			expect(data).notTo(beNil());

			RACSequence *unarchived = [NSKeyedUnarchiver unarchiveObjectWithData:data];
			expect(unarchived).to(equal(sequence));
		});

		qck_it(@"should fold right", ^{
			RACSequence *result = [sequence foldRightWithStart:[RACSequence empty] reduce:^(id first, RACSequence *rest) {
				return [rest.head startWith:first];
			}];
			expect(result.array).to(equal(values));
		});

		qck_it(@"should fold left", ^{
			RACSequence *result = [sequence foldLeftWithStart:[RACSequence empty] reduce:^(RACSequence *first, id rest) {
				return [first concat:[RACSequence return:rest]];
			}];
			expect(result.array).to(equal(values));
		});
	});
}

QuickConfigurationEnd