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

namespace PKHeX.Core;

/// <summary>
/// Side game data for <see cref="PB7"/> data transferred into HOME.
/// </summary>
public sealed class GameDataPB7 : HomeOptional1, IGameDataSide, IScaledSizeAbsolute, IMemoryOT
{
    private const int SIZE = HomeCrypto.SIZE_1GAME_PB7;
    private const HomeGameDataFormat Format = HomeGameDataFormat.PB7;

    public GameDataPB7() : base(Format, SIZE) { }
    public GameDataPB7(byte[] data, int offset = 0) : base(Format, SIZE, data, offset) { }
    public GameDataPB7 Clone() => new(ToArray(SIZE));
    public int CopyTo(Span<byte> result) => CopyTo(result, SIZE);

    #region Structure

    public byte AV_HP  { get => Data[Offset + 0x00]; set => Data[Offset + 0x00] = value; }
    public byte AV_ATK { get => Data[Offset + 0x01]; set => Data[Offset + 0x01] = value; }
    public byte AV_DEF { get => Data[Offset + 0x02]; set => Data[Offset + 0x02] = value; }
    public byte AV_SPE { get => Data[Offset + 0x03]; set => Data[Offset + 0x03] = value; }
    public byte AV_SPA { get => Data[Offset + 0x04]; set => Data[Offset + 0x04] = value; }
    public byte AV_SPD { get => Data[Offset + 0x05]; set => Data[Offset + 0x05] = value; }
    public byte ResortEventState { get => Data[Offset + 0x06]; set => Data[Offset + 0x06] = value; }

    public int Move1 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x07)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x07), (ushort)value); }
    public int Move2 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x09)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x09), (ushort)value); }
    public int Move3 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x0B)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x0B), (ushort)value); }
    public int Move4 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x0D)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x0D), (ushort)value); }

    public int Move1_PP { get => Data[Offset + 0x0F]; set => Data[Offset + 0x0F] = (byte)value; }
    public int Move2_PP { get => Data[Offset + 0x10]; set => Data[Offset + 0x10] = (byte)value; }
    public int Move3_PP { get => Data[Offset + 0x11]; set => Data[Offset + 0x11] = (byte)value; }
    public int Move4_PP { get => Data[Offset + 0x12]; set => Data[Offset + 0x12] = (byte)value; }
    public int Move1_PPUps { get => Data[Offset + 0x13]; set => Data[Offset + 0x13] = (byte)value; }
    public int Move2_PPUps { get => Data[Offset + 0x14]; set => Data[Offset + 0x14] = (byte)value; }
    public int Move3_PPUps { get => Data[Offset + 0x15]; set => Data[Offset + 0x15] = (byte)value; }
    public int Move4_PPUps { get => Data[Offset + 0x16]; set => Data[Offset + 0x16] = (byte)value; }

    public int RelearnMove1 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x17)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x17), (ushort)value); }
    public int RelearnMove2 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x19)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x19), (ushort)value); }
    public int RelearnMove3 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x1B)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x1B), (ushort)value); }
    public int RelearnMove4 { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x1D)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x1D), (ushort)value); }
    public float HeightAbsolute { get => ReadSingleLittleEndian(Data.AsSpan(Offset + 0x1F)); set => WriteSingleLittleEndian(Data.AsSpan(Offset + 0x1F), value); }
    public float WeightAbsolute { get => ReadSingleLittleEndian(Data.AsSpan(Offset + 0x23)); set => WriteSingleLittleEndian(Data.AsSpan(Offset + 0x23), value); }

    public byte FieldEventFatigue1 { get => Data[Offset + 0x27]; set => Data[Offset + 0x27] = value; }
    public byte FieldEventFatigue2 { get => Data[Offset + 0x28]; set => Data[Offset + 0x28] = value; }
    public byte Fullness { get => Data[Offset + 0x29]; set => Data[Offset + 0x29] = value; }
    public byte Rank { get => Data[Offset + 0x2A]; set => Data[Offset + 0x2A] = value; }
    public int OT_Affection { get => Data[Offset + 0x2B]; set => Data[Offset + 0x2B] = (byte)value; }
    public byte OT_Intensity { get => Data[Offset + 0x2C]; set => Data[Offset + 0x2C] = value; }
    public byte OT_Memory { get => Data[Offset + 0x2D]; set => Data[Offset + 0x2D] = value; }
    public ushort OT_TextVar { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x2E)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x2E), value); }
    public byte OT_Feeling { get => Data[Offset + 0x30]; set => Data[Offset + 0x30] = value; }
    public byte Enjoyment { get => Data[Offset + 0x31]; set => Data[Offset + 0x31] = value; }
    public uint GeoPadding { get => ReadUInt32LittleEndian(Data.AsSpan(Offset + 0x32)); set => WriteUInt32LittleEndian(Data.AsSpan(Offset + 0x32), value); }
    public int Ball { get => Data[Offset + 0x36]; set => Data[Offset + 0x36] = (byte)value; }
    public int Egg_Location { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x37)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x37), (ushort)value); }
    public int Met_Location { get => ReadUInt16LittleEndian(Data.AsSpan(Offset + 0x39)); set => WriteUInt16LittleEndian(Data.AsSpan(Offset + 0x39), (ushort)value); }

    #endregion

    #region Conversion

    public PersonalInfo GetPersonalInfo(int species, int form) => PersonalTable.GG.GetFormEntry(species, form);

    public void CopyTo(PB7 pk)
    {
        ((IGameDataSide)this).CopyTo(pk);
        pk.AV_HP = AV_HP;
        pk.AV_ATK = AV_ATK;
        pk.AV_DEF = AV_DEF;
        pk.AV_SPE = AV_SPE;
        pk.AV_SPA = AV_SPA;
        pk.AV_SPD = AV_SPD;
        pk.ResortEventStatus = (ResortEventState)ResortEventState;
        pk.HeightAbsolute = pk.CalcHeightAbsolute; // Ignore the stored value, be nice and recalculate for the user.
        pk.WeightAbsolute = pk.CalcWeightAbsolute; // Ignore the stored value, be nice and recalculate for the user.

        // Some fields are unused as PB7, don't bother copying.
        pk.FieldEventFatigue1 = FieldEventFatigue1;
        pk.FieldEventFatigue2 = FieldEventFatigue2;
        pk.Fullness = Fullness;
        // pk.Rank = Rank;
        // pk.OT_Affection
        // pk.OT_Intensity
        // pk.OT_Memory
        // pk.OT_TextVar
        // pk.OT_Feeling
        pk.Enjoyment = Enjoyment;
        // pk.GeoPadding = GeoPadding;
    }

    public PKM ConvertToPKM(PKH pkh) => ConvertToPB7(pkh);

    public PB7 ConvertToPB7(PKH pkh)
    {
        var pk = new PB7();
        pkh.CopyTo(pk);
        CopyTo(pk);
        return pk;
    }

    #endregion

    /// <summary> Reconstructive logic to best apply suggested values. </summary>
    public static GameDataPB7? TryCreate(PKH pkh)
    {
        int met = 0;
        int ball = (int)Core.Ball.Poke;
        if (pkh.DataPK8 is { } x)
        {
            met = x.Met_Location;
            ball = x.Ball;
        }
        else if (pkh.DataPB8 is { } y)
        {
            met = y.Met_Location;
            ball = y.Ball;
        }
        else if (pkh.DataPA8 is { } z)
        {
            met = z.Met_Location;
            ball = z.Ball;
        }
        if (met == 0)
            return null;

        if (pkh.Version is (int)GameVersion.GO)
            return new GameDataPB7 { Ball = ball, Met_Location = Locations.GO7 };
        if (pkh.Version is (int)GameVersion.GP or (int)GameVersion.GE)
            return new GameDataPB7 { Ball = ball, Met_Location = met };

        return null;
    }

    public static T Create<T>(GameDataPB7 data) where T : IGameDataSide, new() => new()
    {
        Ball = data.Ball,
        Met_Location = data.Met_Location,
        Egg_Location = data.Egg_Location,
    };
}