/**
 * ========================================================================================================================
 * 以下代碼僅僅為了調用服務端接口計算簽名，其邏輯可參考文檔：http://m.bestwisewords.com/document_detail/144904.html
 * ========================================================================================================================
 */

+(NSString*)allKeysGotoSignatureWithDict:(NSMutableDictionary*)bodyDict endpoint:(NSString*)endpoint accessSecret:(NSString*)accessSecret httpMethod:(NSString*)httpMethod apiVersion:(NSString*)apiVersion{
    // 系統參數
    bodyDict[@"SignatureMethod"] = @"HMAC-SHA1";
    bodyDict[@"SignatureNonce"] = [self getNonce];
    bodyDict[@"SignatureVersion"] = @"1.0";
    bodyDict[@"Timestamp"] = [self getTimestamp];
    bodyDict[@"Format"] = @"JSON";
    // 業務API參數
    bodyDict[@"RegionId"] = @"cn-shanghai";
    bodyDict[@"Version"] = apiVersion;
    //key升序排序
    NSString *sortedQueryString = [self bodyToFormString:bodyDict];

    NSMutableString *stringToSign = [NSMutableString string];
    [stringToSign appendString:[NSString stringWithFormat:@"%@&",httpMethod]];
    [stringToSign appendString:[NSString stringWithFormat:@"%@&",[self urlEncode:@"/"]]];
    [stringToSign appendString:[self urlEncode:sortedQueryString]];
    //hmacsha1 加簽
    NSString *sign = [self hmacSha1:[NSString stringWithFormat:@"%@&",accessSecret] data:stringToSign];
    // 簽名最后也要做特殊URL編碼
    NSString *signature = [self urlEncode:sign];
    //最后結果
    NSString *finalUrl = [NSString stringWithFormat:@"https://%@/?Signature=%@&%@",endpoint,signature,sortedQueryString];
    NSLog(@"finalUrl:%@",finalUrl);
    return finalUrl;
}

+(NSString*)hmacSha1:(NSString*)key data:(NSString*)data{
    const char *cKey  = [key cStringUsingEncoding:NSUTF8StringEncoding];
    const char *cData = [data cStringUsingEncoding:NSUTF8StringEncoding];
    //sha1
    unsigned char cHMAC[CC_SHA1_DIGEST_LENGTH];
    CCHmac(kCCHmacAlgSHA1, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
    NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC
                                          length:sizeof(cHMAC)];
    NSString *hash = [HMAC base64EncodedStringWithOptions:0];//將加密結果進行一次BASE64編碼。
    return hash;
}

+(NSString*)getNonce{
    NSTimeInterval timestamp = [[NSDate date]timeIntervalSince1970];
    NSString *string = [NSString stringWithFormat:@"%f%@",timestamp, [[NSUUID UUID]UUIDString]];
    NSString*md5 = [self md5String:string];
    return md5;
}

// md5
+ (NSString *)md5String:(NSString *)string{
    const char *cStr = [string UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cStr, (CC_LONG)strlen(cStr), result);
    return [NSString stringWithFormat:
                @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
            result[0], result[1], result[2], result[3],
            result[4], result[5], result[6], result[7],
            result[8], result[9], result[10], result[11],
            result[12], result[13], result[14], result[15]
    ];
}

+(NSString*)getTimestamp {
    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
    formatter.timeZone = [NSTimeZone timeZoneWithName:@"GMT"];
    formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss'Z'";
    return [formatter stringFromDate:[NSDate date]];
}

+(NSString*)bodyToFormString:(NSMutableDictionary*)query{
    NSString* url = @"";
    if (query != nil && query.count > 0) {
        NSArray *keys = query.allKeys;
        NSArray*sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1,id obj2) {
            return[obj1 compare:obj2 options:NSNumericSearch];//正序排列
        }];
        NSMutableArray *arr = [NSMutableArray array];
        for (NSString *key in sortedArray) {
            NSString *value = query[key];
            if (value.length==0) {
                continue;
            }
            NSString *key2 = [NSString stringWithFormat:@"%@=%@",[self urlEncode:key],[self urlEncode:value]];
            [arr addObject:key2];
        }
        if(arr.count > 0) {
            url = [arr componentsJoinedByString:@"&"];
        }
    }
    return url;
}

+(NSString*)urlEncode:(NSString*)value{
    NSString *unreserved = @"*-._";
    NSMutableCharacterSet *allowedCharacterSet = [NSMutableCharacterSet alphanumericCharacterSet];
    [allowedCharacterSet addCharactersInString:unreserved];
    [allowedCharacterSet addCharactersInString:@" "];
    NSString *encoded = [value stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacterSet];
    encoded = [encoded stringByReplacingOccurrencesOfString:@" " withString:@"%20"];
    encoded = [encoded stringByReplacingOccurrencesOfString:@"+" withString:@"%20"];
    encoded = [encoded stringByReplacingOccurrencesOfString:@"*" withString:@"%2A"];
    encoded = [encoded stringByReplacingOccurrencesOfString:@"%7E" withString:@"~"];
    return encoded ;
}

+(void)request:(NSString*)request responseBlock:(void(^)(NSDictionary *responseObject, NSError *error))block{
    NSMutableURLRequest *msRequest = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:request]];
    [msRequest setHTTPMethod:@"POST"];
    msRequest.timeoutInterval = 60;
    [msRequest addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:msRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
        NSError *parseError = nil;
        if(httpResponse.statusCode == 200){
            NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&parseError];
            NSLog(@"response:%@",responseDictionary);
            block([responseDictionary objectForKey:@"Data"],nil);
        }else{
            NSLog(@"%@,error:%@",httpResponse,error);
            if (error) {
                block(nil,error);
            }else{
                NSDictionary *errorDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
                NSLog(@"errorDict:%@",errorDict);
                NSString *codevalue = [errorDict objectForKey:@"Code"];
                NSString *msgvalue = [errorDict objectForKey:@"Message"];
                NSDictionary *info = [NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:@"code:%@,error msg:%@",codevalue,msgvalue], NSLocalizedDescriptionKey,nil];
                parseError = [[NSError alloc] initWithDomain:NSCocoaErrorDomain code:httpResponse.statusCode userInfo:info];
                block(nil,parseError);
            }
        }
    }];
    [dataTask resume];
}

@end

/**
 以RecognizeBankCard為例。
 @param imageUrl 銀行卡圖片url
 */
+(void)recognizeBankCardWithImageUrl:(NSString*)imageUrl responseBlock:(void(^)(NSDictionary *data, NSError *error))block{
    NSMutableDictionary *bodyDict = [NSMutableDictionary dictionary];
    bodyDict[@"AccessKeyId"] = ACCESS_KEY_ID;
    // API Action，能力名稱，請參考具體算法文檔詳情頁中的Action參數，這里以銀行卡識別為例：http://m.bestwisewords.com/document_detail/151893.html
    bodyDict[@"Action"] = @"RecognizeBankCard";
    // 業務參數，請參考具體的AI能力的API文檔
    bodyDict[@"ImageURL"] = imageUrl;

    // 添加STS的SecurityToken
    bodyDict[@"SecurityToken"] = SECURITY_TOKEN;
    // 驗簽
    // 這里endpoint為API訪問域名，與類目相關，具體類目的API訪問域名請參考：http://m.bestwisewords.com/document_detail/143103.html
    // httpMethod推薦使用POST
    // apiVersion為API版本，與類目相關，具體類目的API版本請參考：http://m.bestwisewords.com/document_detail/464194.html
    NSString *finalUrl = [self allKeysGotoSignatureWithDict:bodyDict endpoint:@"ocr.cn-shanghai.aliyuncs.com" accessSecret:ACCESS_KEY_SECRET httpMethod:@"POST" apiVersion:@"2019-12-30"];
    //直接發post請求
    [self request:finalUrl responseBlock:^(NSDictionary *responseObject, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (error) {
                block(nil,error);
            }else{
                block(responseObject, nil);
            }
        });
    }];
}

/**
 * 調用API
 */
- (void)callApi {
    
    NSString* imageUrl = @"http://viapi-test.oss-cn-shanghai.aliyuncs.com/viapi-3.0domepic/ocr/RecognizeBankCard/yhk1.jpg";
    [CallApiClient recognizeBankCardWithImageUrl:imageUrl responseBlock:^(NSDictionary * _Nonnull data, NSError * _Nonnull error) {
        if (error) {
            if ([error.localizedDescription containsString:@"InvalidAccessKeyId.NotFound"]) {
                [self alertInfomation:@"請求報錯，請檢查您代碼中的YOUR_ACCESS_KEY_ID和YOUR_ACCESS_KEY_SECRET是否已經修改正確。"];
            } else if([error.localizedDescription containsString:@"InvalidApi.NotPurchase"]) {
                [self alertInfomation:@"請求報錯，您的賬號未開通視覺智能開放平臺相應類目，請進行開通：http://m.bestwisewords.com/document_detail/465341.html"];
            } else if([error.localizedDescription containsString:@"Unauthorized"]) {
                [self alertInfomation:@"請求報錯，您的子賬號未授予AliyunVIAPIFullAccess權限，請參考http://m.bestwisewords.com/document_detail/145025.html"];
            } else if([error.localizedDescription containsString:@"InvalidAction.NotFound"]) {
                [self alertInfomation:@"請求報錯，請檢查您調用的API和類目是否匹配，API和類目的關系請參考：http://m.bestwisewords.com/document_detail/465341.html，和訪問的域名是否匹配，類目和域名的關系請參考：http://m.bestwisewords.com/document_detail/143103.html"];
            } else {
                [self alertInfomation:error.localizedDescription];
            }
        } else {
            // 獲取銀行卡號，這里只是示例，請根據文檔獲取自己想要的出參
            NSString* cardNumber = [data objectForKey:@"CardNumber"];
            [self alertInfomation:[NSString stringWithFormat:@"銀行卡號：%@", cardNumber]];
        }
    }];
}

/**
 獲取oss sts token，使用阿里云視覺智能開放平臺官方OSS-Bucket作為臨時存儲，僅為方便用戶方便調試接口使用，文件存儲有效期為1天。
 */
+(void)getOssStsTokenWithAk:(NSString*)accessKey andSk:(NSString*)accessSecret responseBlock:(void(^)(NSDictionary *data, NSError *error))block {
    NSMutableDictionary *bodyDict = [NSMutableDictionary dictionary];
    bodyDict[@"AccessKeyId"] = accessKey;
    // 獲取阿里云視覺智能開放平臺官方OSS-Bucket的stsToken的Action固定為GetOssStsToken
    bodyDict[@"Action"] = @"GetOssStsToken";
    // 驗簽
    // 這里endpoint為API訪問域名，獲取阿里云視覺智能開放平臺官方OSS-Bucket的stsToken的域名固定為：viapiutils.cn-shanghai.aliyuncs.com
    // httpMethod推薦使用POST
    // apiVersion為API版本，獲取阿里云視覺智能開放平臺官方OSS-Bucket的stsToken的域名固定為：2020-04-01
    NSString *finalUrl = [self allKeysGotoSignatureWithDict:bodyDict endpoint:@"viapiutils.cn-shanghai.aliyuncs.com" accessSecret:accessSecret httpMethod:@"POST" apiVersion:@"2020-04-01"];
    //直接發post請求
    [self request:finalUrl responseBlock:^(NSDictionary *responseObject, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (error) {
                block(nil,error);
            }else{
                block(responseObject, nil);
            }
        });
    }];
}

#import "ViapiUtils.h"
#import "CallApiClient.h"
#import <AliyunOSSiOS/AliyunOSSiOS.h>

@implementation ViapiUtils

+(void)uploadWithAk:(NSString*)accessKeyId andSk:(NSString*)accessKeySecret andToken:(NSString*)securityToken  andData:(NSData *)imageData responseBlock:(void(^)(NSString *imageUrl, NSError *error))block {
    [CallApiClient getOssStsTokenWithAk:accessKeyId andSk:accessKeySecret andToken:securityToken responseBlock:^(NSDictionary * _Nonnull data, NSError * _Nonnull error) {
        if (error) {
            block(nil, error);
        } else {
            // 獲取到sts token，用來初始化oss client
            id<OSSCredentialProvider> credential = [[OSSFederationCredentialProvider alloc] initWithFederationTokenGetter:^OSSFederationToken * {
                    OSSFederationToken * token = [OSSFederationToken new];
                    token.tAccessKey = [data objectForKey:@"AccessKeyId"];
                    token.tSecretKey =[data objectForKey:@"AccessKeySecret"];
                    token.tToken =[data objectForKey:@"SecurityToken"];
                    return token;
            }];
            OSSClientConfiguration *conf = [OSSClientConfiguration new];
            conf.maxRetryCount = 3; // 網絡請求遇到異常失敗后的重試次數
            conf.timeoutIntervalForRequest = 20; // 網絡請求的超時時間
            conf.timeoutIntervalForResource = 24*60*60; // 允許資源傳輸的最長時間
            conf.maxConcurrentRequestCount = 30;
            OSSClient *client = [[OSSClient alloc] initWithEndpoint:@"http://oss-cn-shanghai.aliyuncs.com" credentialProvider:credential clientConfiguration:conf];
            
            OSSPutObjectRequest * put = [OSSPutObjectRequest new];
            // bucketName固定填viapi-customer-temp
            put.bucketName = @"viapi-customer-temp";
            NSString *sourceNameObjectKey = [NSString stringWithFormat:@"%@/%@",accessKeyId,[[NSUUID UUID]UUIDString]];
            put.objectKey = sourceNameObjectKey;
            NSLog(@"put.objectKey:%@ [NSData dataWithContentsOfFile:file]==%@",put.objectKey,data);
            put.uploadingData = imageData;
            OSSTask * putTask = [client putObject:put];
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                [putTask continueWithBlock:^id _Nullable(OSSTask * _Nonnull task) {
                    if (!task.error) {
                        OSSTask *downloadURLTask = [client presignConstrainURLWithBucketName:@"viapi-customer-temp" withObjectKey:put.objectKey withExpirationInterval:24*3600];
                        NSString * string = downloadURLTask.result;
                        NSLog(@"inner string:%@", string);
                        NSArray *arr =[string componentsSeparatedByString:@"?"];
                        NSString* imageUrl = arr.count > 0 ? arr[0] :string;
                        NSLog(@"upload object success! %@", imageUrl);
                        block(imageUrl, nil);
                    } else {
                        NSLog(@"upload object failed, error: %@" , putTask.error);
                        block(nil, putTask.error);
                    }
                    return nil;
                }];
                [putTask waitUntilFinished]; // 阻塞直到上傳完成
            });
        }
    }];
}

@end

+(void)recognizeBankCardWithImageUrl:(NSString*)imageUrl andAk:(NSString*)accessKey andSk:(NSString*)accessSecret andToken:(NSString*)securityToken  responseBlock:(void(^)(NSDictionary *data, NSError *error))block{
    NSMutableDictionary *bodyDict = [NSMutableDictionary dictionary];
    bodyDict[@"AccessKeyId"] = accessKey;
    // API Action，能力名稱，請參考具體算法文檔詳情頁中的Action參數，這里以銀行卡識別為例：http://m.bestwisewords.com/document_detail/151893.html
    bodyDict[@"Action"] = @"RecognizeBankCard";
    // 業務參數，請參考具體的AI能力的API文檔
    bodyDict[@"ImageURL"] = imageUrl;

    bodyDict[@"SecurityToken"] = securityToken;

    // 驗簽
    // 這里endpoint為API訪問域名，與類目相關，具體類目的API訪問域名請參考：http://m.bestwisewords.com/document_detail/143103.html
    // httpMethod推薦使用POST
    // apiVersion為API版本，與類目相關，具體類目的API版本請參考：http://m.bestwisewords.com/document_detail/464194.html
    NSString *finalUrl = [self allKeysGotoSignatureWithDict:bodyDict endpoint:@"ocr.cn-shanghai.aliyuncs.com" accessSecret:accessSecret httpMethod:@"POST" apiVersion:@"2019-12-30"];
    //直接發post請求
    [self request:finalUrl responseBlock:^(NSDictionary *responseObject, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if (error) {
                block(nil,error);
            }else{
                block(responseObject, nil);
            }
        });
    }];
}