#import "NNSectionsDiffChange.h"

@implementation NNSectionsDiffChange

#pragma mark - Init

- (instancetype)init {

return [self initWithBefore:nil after:nil type:0];

}

- (instancetype)initWithBefore:(NSIndexPath *)before after:(NSIndexPath *)after type:(NNDiffChangeType)type {

NSParameterAssert(before != nil);

NSParameterAssert(after != nil);

NSParameterAssert(type != 0);

self = [super init];

if (!self) return nil;

_before = before;

_after = after;

_type = type;

return self;

}

#pragma mark - NSObject

- (BOOL)isEqual:(id)other {

if (other == self) return YES;

if (!other || ![other isKindOfClass:[NNSectionsDiffChange class]]) return NO;

return [self isEqualToSectionsDiffChange:other];

}

- (BOOL)isEqualToSectionsDiffChange:(NNSectionsDiffChange *)other {

if (![self.before isEqual:other.before]) return NO;

if (![self.after isEqual:other.after]) return NO;

if (self.type != other.type) return NO;

return YES;

}

- (NSUInteger)hash {

NSUInteger prime = 31;

NSUInteger result = 1;

result = prime * result + [self.before hash];

result = prime * result + [self.after hash];

result = prime * result + self.type;

return result;

}

- (NSString *)description {

NSString *typeString;

if (self.type == NNDiffChangeUpdate) {

typeString = @"·>";

} else if (self.type == NNDiffChangeMove) {

typeString = @"->";

} else {

typeString = @"=>";

}

return [NSString stringWithFormat:@"%@.%@ %@ %@.%@",

@([self.before indexAtPosition:0]), @([self.before indexAtPosition:1]),

typeString,

@([self.after indexAtPosition:0]), @([self.after indexAtPosition:1])];

}

#pragma mark - NSCopying

- (id)copyWithZone:(NSZone *)zone {

return self;

}