using System;
using System.IO;
using System.Threading;
using NBitcoin.DataEncoders;

namespace NBitcoin.Tests
{
    class TestUtils
    {
        public static void Eventually(Func<bool> act)
        {
            var cancel = new CancellationTokenSource(20000);
            while(!act())
            {
                cancel.Token.ThrowIfCancellationRequested();
                Thread.Sleep(50);
            }
        }

        public static byte[] ToBytes(string str)
        {
            byte[] result = new byte[str.Length];
            for(int i = 0; i < str.Length; i++)
            {
                result[i] = (byte)str[i];
            }
            return result;
        }

        internal static byte[] ParseHex(string data)
        {
            return Encoders.Hex.DecodeData(data);
        }

        public static Block CreateFakeBlock(Transaction tx)
        {
            var block = new Block();
            block.AddTransaction(tx);
            block.UpdateMerkleRoot();
            return block;
        }

        public static Block CreateFakeBlock()
        {
            var block = TestUtils.CreateFakeBlock(new Transaction());
            block.Header.HashPrevBlock = new uint256(RandomUtils.GetBytes(32));
            block.Header.Nonce = RandomUtils.GetUInt32();
            return block;
        }

        internal static void EnsureNew(string folderName)
        {
            if(Directory.Exists(folderName))
                Directory.Delete(folderName, true);
            while(true)
            {
                try
                {
                    Directory.CreateDirectory(folderName);
                    break;
                }
                catch
                {
                }
            }

        }
    }
}
