using System;
using static System.Buffers.Binary.BinaryPrimitives;

namespace PKHeX.Core
{
    public sealed class Puff6 : SaveBlock
    {
        private const int MaxPuffID = 26; // Supreme Winter Poké Puff
        private const int PuffSlots = 100;

        public Puff6(SaveFile SAV, int offset) : base(SAV) => Offset = offset;

        public byte[] GetPuffs() => SAV.GetData(Offset, PuffSlots);
        public void SetPuffs(byte[] value) => SAV.SetData(value, Offset);

        public int PuffCount
        {
            get => ReadInt32LittleEndian(Data.AsSpan(Offset + PuffSlots));
            set => WriteInt32LittleEndian(Data.AsSpan(Offset + PuffSlots), value);
        }

        public void Reset()
        {
            Array.Clear(Data, Offset, PuffSlots);
            // Set the first few default Puffs
            Data[Offset + 0] = 1;
            Data[Offset + 1] = 2;
            Data[Offset + 2] = 3;
            Data[Offset + 3] = 4;
            Data[Offset + 4] = 5;
            PuffCount = 5;
        }

        public void MaxCheat(bool special = false)
        {
            var rnd = Util.Rand;
            if (special)
            {
                for (int i = 0; i < PuffSlots; i++)
                    Data[Offset + i] = (byte)(21 + rnd.Next(2)); // Supreme Wish or Honor
            }
            else
            {
                for (int i = 0; i < PuffSlots; i++)
                    Data[Offset + i] = (byte)((i % MaxPuffID) + 1);
                Util.Shuffle(Data.AsSpan(), Offset, Offset + PuffSlots, rnd);
            }
            PuffCount = PuffSlots;
        }

        public void Sort(bool reverse = false)
        {
            Array.Sort(Data, Offset, PuffCount);
            if (reverse)
                Array.Reverse(Data, Offset, PuffCount);
        }
    }
}