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using System.Collections.Generic;

namespace Obfuz.ObfusPasses.SymbolObfus.NameMakers
{

    public class WordSetNameMaker : NameMakerBase
    {
        private readonly string _namePrefix;
        private readonly List<string> _wordSet;
        private readonly int _seed;
        private int _scopeIndex;

        public WordSetNameMaker(string namePrefix, List<string> wordSet) : this(namePrefix, wordSet, 0)
        {
        }

        public WordSetNameMaker(string namePrefix, List<string> wordSet, int seed)
        {
            _namePrefix = namePrefix;
            _wordSet = wordSet;
            _seed = seed;
        }

        protected override INameScope CreateNameScope()
        {
            if (_seed == 0)
            {
                return new NameScope(_namePrefix, _wordSet);
            }

            // Distinct per scope, otherwise every scope would emit the same sequence.
            int scopeSeed = unchecked(_seed + _scopeIndex++ * (int)0x9E3779B9);
            return new NameScope(_namePrefix, _wordSet, scopeSeed != 0 ? scopeSeed : 1);
        }
    }
}