#import "JSONModelError.h"

NSString* const JSONModelErrorDomain = @"JSONModelErrorDomain";

NSString* const kJSONModelMissingKeys = @"kJSONModelMissingKeys";

NSString* const kJSONModelTypeMismatch = @"kJSONModelTypeMismatch";

NSString* const kJSONModelKeyPath = @"kJSONModelKeyPath";

@implementation JSONModelError

+(id)errorInvalidDataWithMessage:(NSString*)message

{

message = [NSString stringWithFormat:@"Invalid JSON data: %@", message];

return [JSONModelError errorWithDomain:JSONModelErrorDomain

code:kJSONModelErrorInvalidData

userInfo:@{NSLocalizedDescriptionKey:message}];

}

+(id)errorInvalidDataWithMissingKeys:(NSSet *)keys

{

return [JSONModelError errorWithDomain:JSONModelErrorDomain

code:kJSONModelErrorInvalidData

userInfo:@{NSLocalizedDescriptionKey:@"Invalid JSON data. Required JSON keys are missing from the input. Check the error user information.",kJSONModelMissingKeys:[keys allObjects]}];

}

+(id)errorInvalidDataWithTypeMismatch:(NSString*)mismatchDescription

{

return [JSONModelError errorWithDomain:JSONModelErrorDomain

code:kJSONModelErrorInvalidData

userInfo:@{NSLocalizedDescriptionKey:@"Invalid JSON data. The JSON type mismatches the expected type. Check the error user information.",kJSONModelTypeMismatch:mismatchDescription}];

}

+(id)errorBadResponse

{

return [JSONModelError errorWithDomain:JSONModelErrorDomain

code:kJSONModelErrorBadResponse

userInfo:@{NSLocalizedDescriptionKey:@"Bad network response. Probably the JSON URL is unreachable."}];

}

+(id)errorBadJSON

{

return [JSONModelError errorWithDomain:JSONModelErrorDomain

code:kJSONModelErrorBadJSON

userInfo:@{NSLocalizedDescriptionKey:@"Malformed JSON. Check the JSONModel data input."}];

}

+(id)errorModelIsInvalid

{

return [JSONModelError errorWithDomain:JSONModelErrorDomain

code:kJSONModelErrorModelIsInvalid

userInfo:@{NSLocalizedDescriptionKey:@"Model does not validate. The custom validation for the input data failed."}];

}

+(id)errorInputIsNil

{

return [JSONModelError errorWithDomain:JSONModelErrorDomain

code:kJSONModelErrorNilInput

userInfo:@{NSLocalizedDescriptionKey:@"Initializing model with nil input object."}];

}

- (instancetype)errorByPrependingKeyPathComponent:(NSString*)component

{

// Create a mutable copy of the user info so that we can add to it and update it

NSMutableDictionary* userInfo = [self.userInfo mutableCopy];

// Create or update the key-path

NSString* existingPath = userInfo[kJSONModelKeyPath];

NSString* separator = [existingPath hasPrefix:@"["] ? @"" : @".";

NSString* updatedPath = (existingPath == nil) ? component : [component stringByAppendingFormat:@"%@%@", separator, existingPath];

userInfo[kJSONModelKeyPath] = updatedPath;

// Create the new error

return [JSONModelError errorWithDomain:self.domain

code:self.code

userInfo:[NSDictionary dictionaryWithDictionary:userInfo]];

}