README.md

##Product scanner This is an example project that demonstrate on how easy it is to use Indix API to scan a product and show all stores and prices across stores where product can be bought.

###Get Started

1. Signup with Indix.com, and get your API ID and API key.
2. Download this example project and open IndixProductScanner.xcodeproj in your xcode.
3. Enter your API id and key in ViewController.m. Build and run.

###Product search from Indix API It is relatively straight forward to find a product and details of all the stores where product is sold using Indix api,

GET https://api.indix.com/v2/universal/products?countryCode=US&upc=00753759975845

which returns

{
"message": "ok",
"result": {
"count": 1,
"products": [
	"title": "Garmin eTrex 10 GPS Unit",
	"currency": "USD",
	"stores": [
		"108":{
			...
			"storeName": "Cabelas",
			"offers":[
				{
					...
					"listPrice": 109.99,
					"productUrl": "http://www.cabelas.com/product/Garmin-eTrex-GPS-Unit/1218229.uts?productVariantId=2963934"
				}]
			}
		]
	]
}

###Fetch offers in iOS app To get started let's call a method [self performSearchForUPC:@"00753759975845"]; in viewDidLoad which display all the offer for the given UPC.

- (void)performSearchForUPC:(NSString *)upcString {
    NSMutableString *searchUrlByIndix = [[NSMutableString alloc] initWithString:@"https://api.indix.com/v2/universal/products?countryCode=US"];
    [searchUrlByIndix appendString:[NSString stringWithFormat:@"&app_id=%@", INDIX_API_ID]];
    [searchUrlByIndix appendString:[NSString stringWithFormat:@"&app_key=%@", INDIX_API_KEY]];
    [searchUrlByIndix appendString:[NSString stringWithFormat:@"&upc=%@", upcString]];
    // Fetch products from indix url
    [self dojsonGetRequestForURL:[NSURL URLWithString:searchUrlByIndix] 
	    callOnSuccess:^(NSDictionary *jsonData) 
	    {
	        [self onSuccessForUrlProductSearch:jsonData];
	    } 
	    callOnFailure:^(NSError *error) 
	    {
	        [self onFailureForUrlProductSearch:@"Error!!" message:@"There was an error, please check your net connection and try again"];
	    }
    ];
}

dojsonGetRequestForURL is a function which perform a get request for the given URL and do a json parsing on top of the response. On success it executes method in callOnSuccess block and on failure it executes method in callOnFailure block

- (void)dojsonGetRequestForURL:(NSURL *)url callOnSuccess:(void(^)(NSDictionary *data))success callOnFailure:(void(^)(NSError *error))failure {
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:url];
    [request setHTTPMethod:@"GET"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    [[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        if ([(NSHTTPURLResponse*)response statusCode] == 200) {
            NSError *error;
            id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
            if (error) NSLog(@"%@", [error description]);
            dispatch_async(dispatch_get_main_queue(), ^{
                success(jsonObject);
            });
        }
        else {
            if (error) NSLog(@"%@", [error description]);
            dispatch_async(dispatch_get_main_queue(), ^{
                failure(error);
            });
        }
    }] resume];
}

Once we are sure we got proper response, onSuccessForUrlProductSearch: will be executed.

- (void)onSuccessForUrlProductSearch:(NSDictionary *)i_jsonData {
    id i_resultObject = i_jsonData[@"result"];
    id i_allProductArray = i_resultObject[@"products"];
    NSNumber *i_countOfProducts = i_resultObject[@"count"];
    
    if ([i_countOfProducts integerValue] == 0) {
        [self onFailureForUrlProductSearch:@"Error!!" message:@"No products found"];
    }
    else {
        NSArray *o_parsedarray = [self parseProductArrayToExtractProducts:i_allProductArray];
        self.offerArrayForUPC = o_parsedarray;
        [self.tableView reloadData];
    }

}

First, check if we have products detail from the given upc, if yes we continue to parse it to fetch only those information we need

- (NSMutableArray *)parseProductArrayToExtractProducts:(NSArray *)i_allProductArray {
    NSMutableArray *o_parsedarray = [[NSMutableArray alloc] init];
    for (NSDictionary *productDictionary in i_allProductArray) {
        NSDictionary *allstoresDict = [productDictionary objectForKey:@"stores"];
        for(id key in allstoresDict) {
            NSDictionary *storeDictionary = [allstoresDict objectForKey:key];
            NSArray *productoffersArray = [storeDictionary objectForKey:@"offers"];
            for (NSDictionary *productOffers in productoffersArray) {
                NSMutableDictionary *parsedofferDict = [[NSMutableDictionary alloc] init];
                [parsedofferDict setObject:[productOffers objectForKey:@"imageUrl"] forKey:@"imageUrl"];
                [parsedofferDict setObject:[productOffers objectForKey:@"productUrl"] forKey:@"productUrl"];
                [parsedofferDict setObject:[productOffers objectForKey:@"seller"] forKey:@"seller"];
                [parsedofferDict setObject:[productOffers objectForKey:@"salePrice"] forKey:@"salePrice"];
                [parsedofferDict setObject:[productOffers objectForKey:@"listPrice"] forKey:@"listPrice"];
                [parsedofferDict setObject:[productDictionary objectForKey:@"currency"] forKey:@"currency"];
                [parsedofferDict setObject:[storeDictionary objectForKey:@"storeName"] forKey:@"storeName"];
                
                [o_parsedarray addObject:parsedofferDict];
            }
        }
    }
    return o_parsedarray;
}

That is it, we successfully fetched and parsed the response, make sure we handle the error cases properly.

- (void)onFailureForUrlProductSearch:(NSString *)title message:(NSString *)message {
    UIAlertController *alertcontroller = [[UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert] init];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:nil];
    [alertcontroller addAction:okAction];
    [self presentViewController:alertcontroller animated:YES completion:^{
        
    }];
}