.NET Utils SDK Variant Utility

using System;
using Contentstack.Utils;
using Newtonsoft.Json.Linq;

public class VariantUtilsExample
{
    private const string ContentTypeUid = "<CONTENT_TYPE_UID>";

    /// <summary>
    /// Normalize entry JSON by unwrapping a top-level "entry" object when present.
    /// </summary>
    private static JObject UnwrapEntryJson(JObject response)
    {
        return response["entry"] as JObject ?? response;
    }

    public static void Main()
    {
        // Example: entry JSON returned by your Delivery SDK or Content Delivery API call.
        JObject response = JObject.Parse(@"
        {
          ""entry"": {
            ""uid"": ""blt8f9e7c1234567890"",
            ""publish_details"": {
              ""variants"": {
                ""v1"": { ""alias"": ""cs_personalize_0_0"" },
                ""v2"": { ""alias"": ""cs_personalize_0_3"" }
              }
            }
          }
        }");

        JObject entryJson = UnwrapEntryJson(response);

        try
        {
            // 1. Extract variant aliases
            JObject variantInfo = Utils.GetVariantAliases(entryJson, ContentTypeUid);

            string entryUid = variantInfo["entry_uid"]?.ToString() ?? string.Empty;
            JArray aliases = variantInfo["variants"] as JArray ?? new JArray();

            Console.WriteLine($"Entry UID: {entryUid}");
            Console.WriteLine("Aliases:");
            foreach (JToken alias in aliases)
            {
                Console.WriteLine($"- {alias}");
            }

            // 2. Build the data-csvariants payload
            JObject attr = Utils.GetVariantMetadataTags(entryJson, ContentTypeUid);
            string dataCsvariants = attr["data-csvariants"]?.ToString() ?? "[]";

            Console.WriteLine($"data-csvariants: {dataCsvariants}");

            // Optional: parse the JSON string if you want to inspect it in code
            JArray parsed = JArray.Parse(dataCsvariants);
            Console.WriteLine($"Serialized payload count: {parsed.Count}");
        }
        catch (ArgumentException ex)
        {
            // Thrown when contentTypeUid is null/empty,
            // or when the entry is null / missing uid.
            Console.WriteLine($"Variant utility error: {ex.Message}");
        }
    }
}

// Initialize the utility and process a single entry
var variantUtils = new VariantUtility();
JObject entry = GetEntryFromJson(); // Method to fetch your CDA entry
string contentTypeUid = "product";

try {
    JObject result = variantUtils.GetVariantAliases(entry, contentTypeUid);
    // Access aliases from the result object
    var aliases = result["variants"];
} catch (ArgumentException ex) {
    Console.WriteLine($"Validation Error: {ex.Message}");
}

// Initialize the utility and process multiple entries
var variantUtils = new VariantUtility();
JArray entries = GetEntriesFromListResponse(); // Method to fetch your CDA entries list
string contentTypeUid = "product";

try {
    JArray results = variantUtils.GetVariantAliases(entries, contentTypeUid);
    foreach (var result in results) {
        Console.WriteLine($"Entry: {result["entry_uid"]}, Aliases: {result["variants"]}");
    }
} catch (ArgumentException ex) {
    Console.WriteLine($"Validation Error: {ex.Message}");
}

// Initialize the utility and generate metadata tags
var variantUtils = new VariantUtility();
JObject entry = GetEntryFromJson();
string contentTypeUid = "product";

try {
    JObject attributeMap = variantUtils.GetVariantMetadataTags(entry, contentTypeUid);
    string jsonString = attributeMap["data-csvariants"].ToString();
    // Output: "[{\"entry_uid\":\"...\",\"contenttype_uid\":\"...\",\"variants\":[...]}]"
} catch (ArgumentException ex) {
    Console.WriteLine(ex.Message);
}

// Initialize the utility and generate metadata tags for multiple entries
var variantUtils = new VariantUtility();
JArray entries = GetEntriesFromListResponse();
string contentTypeUid = "product";

try {
    JObject attributeMap = variantUtils.GetVariantMetadataTags(entries, contentTypeUid);
    string jsonString = attributeMap["data-csvariants"].ToString();
    // Output: "[{\"entry_uid\":\"...\"},{\"entry_uid\":\"...\"}]"
} catch (ArgumentException ex) {
    Console.WriteLine(ex.Message);
}