#import "BTCardClient_Internal.h"
#import "BTCardNonce_Internal.h"
#import "BTCard_Internal.h"
#import "BTConfiguration+Card.h"

#if __has_include(<Braintree/BraintreeCard.h>) // CocoaPods
#import <Braintree/BTCardRequest.h>
#import <Braintree/BTAPIClient_Internal.h>
#import <Braintree/BTPaymentMethodNonceParser.h>
#import <Braintree/BraintreeCore.h>

#elif SWIFT_PACKAGE // SPM
#import <BraintreeCard/BTCardRequest.h>
#import "../BraintreeCore/BTAPIClient_Internal.h"
#import "../BraintreeCore/BTPaymentMethodNonceParser.h"
#import <BraintreeCore/BraintreeCore.h>

#else // Carthage
#import <BraintreeCard/BTCardRequest.h>
#import <BraintreeCore/BTAPIClient_Internal.h>
#import <BraintreeCore/BTPaymentMethodNonceParser.h>
#import <BraintreeCore/BraintreeCore.h>

#endif

NSString *const BTCardClientErrorDomain = @"com.braintreepayments.BTCardClientErrorDomain";
NSString *const BTCardClientGraphQLTokenizeFeature = @"tokenize_credit_cards";

@interface BTCardClient ()
@end

@implementation BTCardClient

+ (void)load {
    if (self == [BTCardClient class]) {
        [[BTPaymentMethodNonceParser sharedParser] registerType:@"CreditCard" withParsingBlock:^BTPaymentMethodNonce * _Nullable(BTJSON * _Nonnull creditCard) {
            return [BTCardNonce cardNonceWithJSON:creditCard];
        }];
    }
}

- (instancetype)initWithAPIClient:(BTAPIClient *)apiClient {
    if (!apiClient) {
        return nil;
    }
    if (self = [super init]) {
        self.apiClient = apiClient;
    }
    return self;
}

- (instancetype)init {
    return nil;
}

- (void)tokenizeCard:(BTCard *)card completion:(void (^)(BTCardNonce *tokenizedCard, NSError *error))completion {
    BTCardRequest *request = [[BTCardRequest alloc] initWithCard:card];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    [self tokenizeCard:request options:nil completion:completion];
#pragma clang diagnostic pop
}


- (void)tokenizeCard:(BTCardRequest *)request options:(NSDictionary *)options completion:(void (^)(BTCardNonce * _Nullable, NSError * _Nullable))completionBlock
{
    if (!self.apiClient) {
        NSError *error = [NSError errorWithDomain:BTCardClientErrorDomain
                                             code:BTCardClientErrorTypeIntegration
                                         userInfo:@{NSLocalizedDescriptionKey: @"BTCardClient tokenization failed because BTAPIClient is nil."}];
        completionBlock(nil, error);
        return;
    }

    [self.apiClient fetchOrReturnRemoteConfiguration:^(BTConfiguration * _Nullable configuration, NSError * _Nullable error) {
        if (error) {
            completionBlock(nil, error);
            return;
        }

        // Union Pay tokenization requests should not go through the GraphQL API
        if ([self isGraphQLEnabledForCardTokenization:configuration] && !request.enrollmentID) {
            
            if (request.card.authenticationInsightRequested && !request.card.merchantAccountID) {
                NSError *error = [NSError errorWithDomain:BTCardClientErrorDomain
                                                     code:BTCardClientErrorTypeIntegration
                                                 userInfo:@{NSLocalizedDescriptionKey: @"BTCardClient tokenization failed because a merchant account ID is required when authenticationInsightRequested is true."}];
                completionBlock(nil, error);
                return;
            }
            
            NSDictionary *parameters = [request.card graphQLParameters];
            [self.apiClient POST:@""
                      parameters:parameters
                        httpType:BTAPIClientHTTPTypeGraphQLAPI
                      completion:^(BTJSON * _Nullable body, __unused NSHTTPURLResponse * _Nullable response, NSError * _Nullable error)
             {
                 if (error) {
                     if (error.code == NETWORK_CONNECTION_LOST_CODE) {
                         [self.apiClient sendAnalyticsEvent:@"ios.tokenize-card.graphQL.network-connection.failure"];
                     }
                     NSHTTPURLResponse *response = error.userInfo[BTHTTPURLResponseKey];
                     NSError *callbackError = error;

                     if (response.statusCode == 422) {
                         if (error.userInfo) {
                             callbackError = [self constructCallbackErrorForErrorUserInfo:error.userInfo error:error];
                         }
                     }

                     [self sendGraphQLAnalyticsEventWithSuccess:NO];

                     completionBlock(nil, callbackError);
                     return;
                 }

                 BTJSON *cardJSON = body[@"data"][@"tokenizeCreditCard"];
                 [self sendGraphQLAnalyticsEventWithSuccess:YES];

                 BTCardNonce *cardNonce = [BTCardNonce cardNonceWithGraphQLJSON:cardJSON];
                 completionBlock(cardNonce, cardJSON.asError);
             }];
        } else {
            NSDictionary *parameters = [self clientAPIParametersForCard:request options:options];
            [self.apiClient POST:@"v1/payment_methods/credit_cards"
                      parameters:parameters
                      completion:^(BTJSON *body, __unused NSHTTPURLResponse *response, NSError *error)
             {
                 if (error != nil) {
                     if (error.code == NETWORK_CONNECTION_LOST_CODE) {
                         [self.apiClient sendAnalyticsEvent:@"ios.tokenize-card.network-connection.failure"];
                     }
                     NSHTTPURLResponse *response = error.userInfo[BTHTTPURLResponseKey];
                     NSError *callbackError = error;

                     if (response.statusCode == 422) {
                         if (error.userInfo) {
                             callbackError = [self constructCallbackErrorForErrorUserInfo:error.userInfo error:error];
                         }
                     }

                     if (request.enrollmentID) {
                         [self sendUnionPayAnalyticsEvent:NO];
                     } else {
                         [self sendAnalyticsEventWithSuccess:NO];
                     }

                     completionBlock(nil, callbackError);
                     return;
                 }

                 BTJSON *cardJSON = body[@"creditCards"][0];

                 if (request.enrollmentID) {
                     [self sendUnionPayAnalyticsEvent:!cardJSON.isError];
                 } else {
                     [self sendAnalyticsEventWithSuccess:!cardJSON.isError];
                 }

                 // cardNonceWithJSON returns nil when cardJSON is nil, cardJSON.asError is nil when cardJSON is non-nil
                 BTCardNonce *cardNonce = [BTCardNonce cardNonceWithJSON:cardJSON];
                 completionBlock(cardNonce, cardJSON.asError);
             }];
        }
    }];
}

#pragma mark - Analytics

- (void)sendAnalyticsEventWithSuccess:(BOOL)success {
    NSString *event = [NSString stringWithFormat:@"ios.%@.card.%@", self.apiClient.metadata.integrationString, success ? @"succeeded" : @"failed"];
    [self.apiClient sendAnalyticsEvent:event];
}

- (void)sendGraphQLAnalyticsEventWithSuccess:(BOOL)success {
    NSString *event = [NSString stringWithFormat:@"ios.card.graphql.tokenization.%@", success ? @"success" : @"failure"];
    [self.apiClient sendAnalyticsEvent:event];
}

- (void)sendUnionPayAnalyticsEvent:(BOOL)success {
    NSString *event = [NSString stringWithFormat:@"ios.%@.unionpay.nonce-%@", self.apiClient.metadata.integrationString, success ? @"received" : @"failed"];
    [self.apiClient sendAnalyticsEvent:event];
}

#pragma mark - Helpers

+ (NSDictionary *)validationErrorUserInfo:(NSDictionary *)userInfo {
    NSMutableDictionary *mutableUserInfo = [userInfo mutableCopy];
    BTJSON *jsonResponse = userInfo[BTHTTPJSONResponseBodyKey];
    if ([jsonResponse asDictionary]) {
        mutableUserInfo[BTCustomerInputBraintreeValidationErrorsKey] = [jsonResponse asDictionary];
        
        NSString *errorMessage = [jsonResponse[@"error"][@"message"] asString];
        if (errorMessage) {
            mutableUserInfo[NSLocalizedDescriptionKey] = errorMessage;
        }

        BTJSON *fieldError = [jsonResponse[@"fieldErrors"] asArray].firstObject;
        BTJSON *firstFieldError = [fieldError[@"fieldErrors"] asArray].firstObject;
        NSString *firstFieldErrorMessage = [firstFieldError[@"message"] asString];
        if (firstFieldErrorMessage) {
            mutableUserInfo[NSLocalizedFailureReasonErrorKey] = firstFieldErrorMessage;
        }
    }
    return [mutableUserInfo copy];
}

- (NSDictionary *)clientAPIParametersForCard:(BTCardRequest *)request options:(NSDictionary *)options {
    NSMutableDictionary *parameters = [NSMutableDictionary new];
    if (request.card.parameters) {
        NSMutableDictionary *mutableCardParameters = [request.card.parameters mutableCopy];

        if (request.enrollmentID) {
            // Convert the immutable options dictionary so to write to it without overwriting any existing options
            NSMutableDictionary *unionPayEnrollment = [NSMutableDictionary new];
            unionPayEnrollment[@"id"] = request.enrollmentID;
            if (request.smsCode) {
                unionPayEnrollment[@"sms_code"] = request.smsCode;
            }
            mutableCardParameters[@"options"] = [mutableCardParameters[@"options"] mutableCopy];
            mutableCardParameters[@"options"][@"union_pay_enrollment"] = unionPayEnrollment;
        }

        parameters[@"credit_card"] = [mutableCardParameters copy];
    }
    parameters[@"_meta"] = @{
                             @"source" : self.apiClient.metadata.sourceString,
                             @"integration" : self.apiClient.metadata.integrationString,
                             @"sessionId" : self.apiClient.metadata.sessionID,
                             };
    if (options) {
        parameters[@"options"] = options;
    }
    
    if (request.card.authenticationInsightRequested) {
        parameters[@"authenticationInsight"] = @YES;
        parameters[@"merchantAccountId"] = request.card.merchantAccountID;
    }

    return [parameters copy];
}

- (BOOL)isGraphQLEnabledForCardTokenization:(BTConfiguration *)configuration {
    NSArray *graphQLFeatures = [configuration.json[@"graphQL"][@"features"] asStringArray];

    return graphQLFeatures && [graphQLFeatures containsObject:BTCardClientGraphQLTokenizeFeature];
}

- (NSError *)constructCallbackErrorForErrorUserInfo:(NSDictionary *)errorUserInfo error:(NSError *)error {
    NSError *callbackError = error;
    BTJSON *errorCode = nil;
    
    BTJSON *errorResponse = [error.userInfo objectForKey:BTHTTPJSONResponseBodyKey];
    BTJSON *fieldErrors = [errorResponse[@"fieldErrors"] asArray].firstObject;
    errorCode = [fieldErrors[@"fieldErrors"] asArray].firstObject[@"code"];

    if (errorCode == nil) {
        BTJSON *errorResponse = [errorUserInfo objectForKey:BTHTTPJSONResponseBodyKey];
        errorCode = [errorResponse[@"errors"] asArray].firstObject[@"extensions"][@"legacyCode"];
    }

    // Gateway error code for card already exists
    if ([errorCode.asString  isEqual: @"81724"]) {
        callbackError = [NSError errorWithDomain:BTCardClientErrorDomain
                                            code:BTCardClientErrorTypeCardAlreadyExists
                                        userInfo:[self.class validationErrorUserInfo:error.userInfo]];
    } else {
        callbackError = [NSError errorWithDomain:BTCardClientErrorDomain
                                            code:BTCardClientErrorTypeCustomerInputInvalid
                                        userInfo:[self.class validationErrorUserInfo:error.userInfo]];
    }
    return callbackError;
}

@end