using System.Text.RegularExpressions;
using Nethereum.Util;

namespace SupplyChain.BlockChain.Validation
{
    /// <inheritdoc cref="IAddressValidator"/>
    public class AddressValidator : IAddressValidator
    {
        private static readonly Regex AddressRegex = new Regex("^0[xX]([A-Fa-f0-9]{40})$");
        private static readonly AddressUtil AddressUtil = new AddressUtil();

        /// <inheritdoc cref="IAddressValidator.IsValid(string)"/>
        public bool IsValid(string address)
        {
            // Doesn't match length, prefix and hex
            if (!AddressRegex.IsMatch(address))
            {
                return false;
            }

            // It's all lowercase, so no checksum needed
            if (address == address.ToLower())
            {
                return true;
            }

            // Do checksum
            return AddressUtil.IsChecksumAddress(address);
        }
    }
}