using System;
using System.Collections.Generic;

namespace PKHeX.Core
{
    /// <summary>
    /// Generation 6 Evolution Branch Entries
    /// </summary>
    public sealed class EvolutionSet6 : EvolutionSet
    {
        private static readonly HashSet<int> argEvos = new HashSet<int> {6, 8, 16, 17, 18, 19, 20, 21, 22, 29};
        private const int SIZE = 6;
        public EvolutionSet6(byte[] data)
        {
            PossibleEvolutions = new EvolutionMethod[data.Length / SIZE];
            for (int i = 0; i < data.Length; i += SIZE)
            {
                var evo = new EvolutionMethod
                {
                    Method = BitConverter.ToUInt16(data, i + 0),
                    Argument = BitConverter.ToUInt16(data, i + 2),
                    Species = BitConverter.ToUInt16(data, i + 4),

                    // Copy
                    Level = BitConverter.ToUInt16(data, i + 2),
                };

                // Argument is used by both Level argument and Item/Move/etc. Clear if appropriate.
                if (argEvos.Contains(evo.Method))
                    evo.Level = 0;

                PossibleEvolutions[i/SIZE] = evo;
            }
        }
    }
}