namespace QuickDB;

public static class DemoDB
{
    public static void CreateFetch(string value)
    {
        // Prompt the user for input
        Console.WriteLine($"Stored value: {value}");

        // Hash the input string
        string hashedKey = ComputeSHA256Hash(value);

        // Store the hashed key and original input value in a dictionary
        Dictionary<string, string> hashDictionary = new Dictionary<string, string>();
        hashDictionary[hashedKey] = value;

        // Display the hashed key
        Console.WriteLine($"Hashed Key: {hashedKey}");

        // Retrieve the original input value using the hashed key
        if (hashDictionary.TryGetValue(hashedKey, out string retrievedValue))
            Console.WriteLine($"Retrieved Value: {retrievedValue}");
        else
            Console.WriteLine("Key not found in dictionary.");
    }

    // Method to compute SHA256 hash from a string
    static string ComputeSHA256Hash(string rawData)
    {
        // Create a SHA256 instance.
        using SHA256 sha256Hash = SHA256.Create();

        // Compute the hash of the input string.
        byte[] bytes = sha256Hash.ComputeHash(Encoding.UTF8.GetBytes(rawData));

        // Convert byte array to a string (hexadecimal).
        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < bytes.Length; i++)
        {
            builder.Append(bytes[i].ToString("x2"));
        }
        return builder.ToString();
    }
}