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

namespace PKHeX.Core;

/// <summary>
/// Generation 7 Mystery Gift Template File
/// </summary>
public sealed class WC7 : DataMysteryGift, IRibbonSetEvent3, IRibbonSetEvent4, ILangNick, IContestStats, IContestStatsMutable, INature, IMemoryOT
{
    public const int Size = 0x108;
    public override int Generation => 7;
    public override EntityContext Context => EntityContext.Gen7;

    public WC7() : this(new byte[Size]) { }
    public WC7(byte[] data) : base(data) { }

    public int RestrictLanguage { get; set; } // None
    public byte RestrictVersion { get; set; } // Permit All

    public bool CanBeReceivedByVersion(int v)
    {
        if (v is < (int)GameVersion.SN or > (int)GameVersion.UM)
            return false;
        if (RestrictVersion == 0)
            return true; // no data
        var bitIndex = v - (int)GameVersion.SN;
        var bit = 1 << bitIndex;
        return (RestrictVersion & bit) != 0;
    }

    // General Card Properties
    public override int CardID
    {
        get => ReadUInt16LittleEndian(Data.AsSpan(0));
        set => WriteUInt16LittleEndian(Data.AsSpan(0), (ushort)value);
    }

    public override string CardTitle
    {
        // Max len 36 char, followed by null terminator
        get => StringConverter7.GetString(Data.AsSpan(2, 0x4A));
        set => StringConverter7.SetString(Data.AsSpan(2, 0x4A), value.AsSpan(), 36, Language, StringConverterOption.ClearZero);
    }

    internal uint RawDate
    {
        get => ReadUInt32LittleEndian(Data.AsSpan(0x4C));
        set => WriteUInt32LittleEndian(Data.AsSpan(0x4C), value);
    }

    private uint Year
    {
        get => (RawDate / 10000) + 2000;
        set => RawDate = SetDate(value, Month, Day);
    }

    private uint Month
    {
        get => RawDate % 10000 / 100;
        set => RawDate = SetDate(Year, value, Day);
    }

    private uint Day
    {
        get => RawDate % 100;
        set => RawDate = SetDate(Year, Month, value);
    }

    public static uint SetDate(uint year, uint month, uint day) => (Math.Max(0, year - 2000) * 10000) + (month * 100) + day;

    /// <summary>
    /// Gets or sets the date of the card.
    /// </summary>
    public DateTime? Date
    {
        get
        {
            // Check to see if date is valid
            if (!DateUtil.IsDateValid(Year, Month, Day))
                return null;

            return new DateTime((int)Year, (int)Month, (int)Day);
        }
        set
        {
            if (value.HasValue)
            {
                // Only update the properties if a value is provided.
                Year = (ushort)value.Value.Year;
                Month = (byte)value.Value.Month;
                Day = (byte)value.Value.Day;
            }
            else
            {
                // Clear the Met Date.
                // If code tries to access MetDate again, null will be returned.
                Year = 0;
                Month = 0;
                Day = 0;
            }
        }
    }

    public int CardLocation { get => Data[0x50]; set => Data[0x50] = (byte)value; }

    public int CardType { get => Data[0x51]; set => Data[0x51] = (byte)value; }
    public byte CardFlags { get => Data[0x52]; set => Data[0x52] = value; }

    public bool GiftRepeatable { get => (CardFlags & 1) == 0; set => CardFlags = (byte)((CardFlags & ~1) | (value ? 0 : 1)); }
    public override bool GiftUsed { get => (CardFlags & 2) == 2; set => CardFlags = (byte)((CardFlags & ~2) | (value ? 2 : 0)); }
    public bool GiftOncePerDay { get => (CardFlags & 4) == 4; set => CardFlags = (byte)((CardFlags & ~4) | (value ? 4 : 0)); }

    public bool MultiObtain { get => Data[0x53] == 1; set => Data[0x53] = value ? (byte)1 : (byte)0; }

    // BP Properties
    public bool IsBP { get => CardType == 3; set { if (value) CardType = 3; } }
    public int BP { get => ItemID; set => ItemID = value; }

    // Bean (Mame) Properties
    public bool IsBean { get => CardType == 2; set { if (value) CardType = 2; } }
    public int Bean { get => ItemID; set => ItemID = value; }

    // Item Properties
    public override bool IsItem { get => CardType == 1; set { if (value) CardType = 1; } }
    public override int ItemID { get => ReadUInt16LittleEndian(Data.AsSpan(0x68)); set => WriteUInt16LittleEndian(Data.AsSpan(0x68), (ushort)value); }
    public int GetItem(int index) => ReadUInt16LittleEndian(Data.AsSpan(0x68 + (0x4 * index)));
    public void SetItem(int index, ushort item) => WriteUInt16LittleEndian(Data.AsSpan(0x68 + (4 * index)), item);
    public int GetQuantity(int index) => ReadUInt16LittleEndian(Data.AsSpan(0x6A + (0x4 * index)));
    public void SetQuantity(int index, ushort quantity) => WriteUInt16LittleEndian(Data.AsSpan(0x6A + (4 * index)), quantity);

    public override int Quantity
    {
        get => ReadUInt16LittleEndian(Data.AsSpan(0x6A));
        set => WriteUInt16LittleEndian(Data.AsSpan(0x6A), (ushort)value);
    }

    // Pokémon Properties
    public override bool IsEntity { get => CardType == 0; set { if (value) CardType = 0; } }
    public override bool IsShiny => Shiny.IsShiny();

    public override Shiny Shiny => IsEgg ? Shiny.Random : PIDType switch
    {
        ShinyType6.FixedValue => GetShinyXor() switch
        {
            0 => Shiny.AlwaysSquare,
            <= 15 => Shiny.AlwaysStar,
            _ => Shiny.Never,
        },
        ShinyType6.Random => Shiny.Random,
        ShinyType6.Never => Shiny.Never,
        ShinyType6.Always => Shiny.Always,
        _ => throw new ArgumentOutOfRangeException(),
    };

    private int GetShinyXor()
    {
        // Player owned anti-shiny fixed PID
        if (TID == 0 && SID == 0)
            return int.MaxValue;

        var pid = PID;
        var psv = (int)((pid >> 16) ^ (pid & 0xFFFF));
        var tsv = (TID ^ SID);
        return psv ^ tsv;
    }

    public override int TID
    {
        get => ReadUInt16LittleEndian(Data.AsSpan(0x68));
        set => WriteUInt16LittleEndian(Data.AsSpan(0x68), (ushort)value);
    }

    public override int SID {
        get => ReadUInt16LittleEndian(Data.AsSpan(0x6A));
        set => WriteUInt16LittleEndian(Data.AsSpan(0x6A), (ushort)value);
    }

    public int OriginGame
    {
        get => Data[0x6C];
        set => Data[0x6C] = (byte)value;
    }

    public uint EncryptionConstant {
        get => ReadUInt32LittleEndian(Data.AsSpan(0x70));
        set => WriteUInt32LittleEndian(Data.AsSpan(0x70), value);
    }

    public override int Ball
    {
        get => Data[0x76];
        set => Data[0x76] = (byte)value; }

    public override int HeldItem
    {
        get => ReadUInt16LittleEndian(Data.AsSpan(0x78));
        set => WriteUInt16LittleEndian(Data.AsSpan(0x78), (ushort)value);
    }

    public int Move1 { get => ReadUInt16LittleEndian(Data.AsSpan(0x7A)); set => WriteUInt16LittleEndian(Data.AsSpan(0x7A), (ushort)value); }
    public int Move2 { get => ReadUInt16LittleEndian(Data.AsSpan(0x7C)); set => WriteUInt16LittleEndian(Data.AsSpan(0x7C), (ushort)value); }
    public int Move3 { get => ReadUInt16LittleEndian(Data.AsSpan(0x7E)); set => WriteUInt16LittleEndian(Data.AsSpan(0x7E), (ushort)value); }
    public int Move4 { get => ReadUInt16LittleEndian(Data.AsSpan(0x80)); set => WriteUInt16LittleEndian(Data.AsSpan(0x80), (ushort)value); }
    public override int Species { get => ReadUInt16LittleEndian(Data.AsSpan(0x82)); set => WriteUInt16LittleEndian(Data.AsSpan(0x82), (ushort)value); }
    public override int Form { get => Data[0x84]; set => Data[0x84] = (byte)value; }
    public int Language { get => Data[0x85]; set => Data[0x85] = (byte)value; }

    public string Nickname
    {
        get => StringConverter7.GetString(Data.AsSpan(0x86, 0x1A));
        set => StringConverter7.SetString(Data.AsSpan(0x86, 0x1A), value.AsSpan(), 12, Language, StringConverterOption.ClearZero);
    }

    public int Nature { get => (sbyte)Data[0xA0]; set => Data[0xA0] = (byte)value; }
    public override int Gender { get => Data[0xA1]; set => Data[0xA1] = (byte)value; }
    public override int AbilityType { get => Data[0xA2]; set => Data[0xA2] = (byte)value; }
    public ShinyType6 PIDType { get => (ShinyType6)Data[0xA3]; set => Data[0xA3] = (byte)value; }
    public override int EggLocation { get => ReadUInt16LittleEndian(Data.AsSpan(0xA4)); set => WriteUInt16LittleEndian(Data.AsSpan(0xA4), (ushort)value); }
    public int MetLocation  { get => ReadUInt16LittleEndian(Data.AsSpan(0xA6)); set => WriteUInt16LittleEndian(Data.AsSpan(0xA6), (ushort)value); }
    public int MetLevel { get => Data[0xA8]; set => Data[0xA8] = (byte)value; }

    public byte CNT_Cool   { get => Data[0xA9]; set => Data[0xA9] = value; }
    public byte CNT_Beauty { get => Data[0xAA]; set => Data[0xAA] = value; }
    public byte CNT_Cute   { get => Data[0xAB]; set => Data[0xAB] = value; }
    public byte CNT_Smart  { get => Data[0xAC]; set => Data[0xAC] = value; }
    public byte CNT_Tough  { get => Data[0xAD]; set => Data[0xAD] = value; }
    public byte CNT_Sheen  { get => Data[0xAE]; set => Data[0xAE] = value; }

    public int IV_HP { get => Data[0xAF]; set => Data[0xAF] = (byte)value; }
    public int IV_ATK { get => Data[0xB0]; set => Data[0xB0] = (byte)value; }
    public int IV_DEF { get => Data[0xB1]; set => Data[0xB1] = (byte)value; }
    public int IV_SPE { get => Data[0xB2]; set => Data[0xB2] = (byte)value; }
    public int IV_SPA { get => Data[0xB3]; set => Data[0xB3] = (byte)value; }
    public int IV_SPD { get => Data[0xB4]; set => Data[0xB4] = (byte)value; }

    public int OTGender { get => Data[0xB5]; set => Data[0xB5] = (byte)value; }

    public override string OT_Name
    {
        get => StringConverter7.GetString(Data.AsSpan(0xB6, 0x1A));
        set => StringConverter7.SetString(Data.AsSpan(0xB6, 0x1A), value.AsSpan(), 12, Language, StringConverterOption.ClearZero);
    }

    public override byte Level { get => Data[0xD0]; set => Data[0xD0] = value; }
    public override bool IsEgg { get => Data[0xD1] == 1; set => Data[0xD1] = value ? (byte)1 : (byte)0; }
    public ushort AdditionalItem { get => ReadUInt16LittleEndian(Data.AsSpan(0xD2)); set => WriteUInt16LittleEndian(Data.AsSpan(0xD2), value); }

    public uint PID { get => ReadUInt32LittleEndian(Data.AsSpan(0xD4)); set => WriteUInt32LittleEndian(Data.AsSpan(0xD4), value); }
    public int RelearnMove1 { get => ReadUInt16LittleEndian(Data.AsSpan(0xD8)); set => WriteUInt16LittleEndian(Data.AsSpan(0xD8), (ushort)value); }
    public int RelearnMove2 { get => ReadUInt16LittleEndian(Data.AsSpan(0xDA)); set => WriteUInt16LittleEndian(Data.AsSpan(0xDA), (ushort)value); }
    public int RelearnMove3 { get => ReadUInt16LittleEndian(Data.AsSpan(0xDC)); set => WriteUInt16LittleEndian(Data.AsSpan(0xDC), (ushort)value); }
    public int RelearnMove4 { get => ReadUInt16LittleEndian(Data.AsSpan(0xDE)); set => WriteUInt16LittleEndian(Data.AsSpan(0xDE), (ushort)value); }

    public byte OT_Intensity { get => Data[0xE0]; set => Data[0xE0] = value; }
    public byte OT_Memory { get => Data[0xE1]; set => Data[0xE1] = value; }
    public ushort OT_TextVar { get => ReadUInt16LittleEndian(Data.AsSpan(0xE2)); set => WriteUInt16LittleEndian(Data.AsSpan(0xE2), value); }
    public byte OT_Feeling { get => Data[0xE4]; set => Data[0xE4] = value; }

    public int EV_HP { get => Data[0xE5]; set => Data[0xE5] = (byte)value; }
    public int EV_ATK { get => Data[0xE6]; set => Data[0xE6] = (byte)value; }
    public int EV_DEF { get => Data[0xE7]; set => Data[0xE7] = (byte)value; }
    public int EV_SPE { get => Data[0xE8]; set => Data[0xE8] = (byte)value; }
    public int EV_SPA { get => Data[0xE9]; set => Data[0xE9] = (byte)value; }
    public int EV_SPD { get => Data[0xEA]; set => Data[0xEA] = (byte)value; }

    private byte RIB0 { get => Data[0x74]; set => Data[0x74] = value; }
    private byte RIB1 { get => Data[0x75]; set => Data[0x75] = value; }
    public bool RibbonChampionBattle   { get => (RIB0 & (1 << 0)) == 1 << 0; set => RIB0 = (byte)((RIB0 & ~(1 << 0)) | (value ? 1 << 0 : 0)); }
    public bool RibbonChampionRegional { get => (RIB0 & (1 << 1)) == 1 << 1; set => RIB0 = (byte)((RIB0 & ~(1 << 1)) | (value ? 1 << 1 : 0)); }
    public bool RibbonChampionNational { get => (RIB0 & (1 << 2)) == 1 << 2; set => RIB0 = (byte)((RIB0 & ~(1 << 2)) | (value ? 1 << 2 : 0)); }
    public bool RibbonCountry          { get => (RIB0 & (1 << 3)) == 1 << 3; set => RIB0 = (byte)((RIB0 & ~(1 << 3)) | (value ? 1 << 3 : 0)); }
    public bool RibbonNational         { get => (RIB0 & (1 << 4)) == 1 << 4; set => RIB0 = (byte)((RIB0 & ~(1 << 4)) | (value ? 1 << 4 : 0)); }
    public bool RibbonEarth            { get => (RIB0 & (1 << 5)) == 1 << 5; set => RIB0 = (byte)((RIB0 & ~(1 << 5)) | (value ? 1 << 5 : 0)); }
    public bool RibbonWorld            { get => (RIB0 & (1 << 6)) == 1 << 6; set => RIB0 = (byte)((RIB0 & ~(1 << 6)) | (value ? 1 << 6 : 0)); }
    public bool RibbonEvent            { get => (RIB0 & (1 << 7)) == 1 << 7; set => RIB0 = (byte)((RIB0 & ~(1 << 7)) | (value ? 1 << 7 : 0)); }
    public bool RibbonChampionWorld    { get => (RIB1 & (1 << 0)) == 1 << 0; set => RIB1 = (byte)((RIB1 & ~(1 << 0)) | (value ? 1 << 0 : 0)); }
    public bool RibbonBirthday         { get => (RIB1 & (1 << 1)) == 1 << 1; set => RIB1 = (byte)((RIB1 & ~(1 << 1)) | (value ? 1 << 1 : 0)); }
    public bool RibbonSpecial          { get => (RIB1 & (1 << 2)) == 1 << 2; set => RIB1 = (byte)((RIB1 & ~(1 << 2)) | (value ? 1 << 2 : 0)); }
    public bool RibbonSouvenir         { get => (RIB1 & (1 << 3)) == 1 << 3; set => RIB1 = (byte)((RIB1 & ~(1 << 3)) | (value ? 1 << 3 : 0)); }
    public bool RibbonWishing          { get => (RIB1 & (1 << 4)) == 1 << 4; set => RIB1 = (byte)((RIB1 & ~(1 << 4)) | (value ? 1 << 4 : 0)); }
    public bool RibbonClassic          { get => (RIB1 & (1 << 5)) == 1 << 5; set => RIB1 = (byte)((RIB1 & ~(1 << 5)) | (value ? 1 << 5 : 0)); }
    public bool RibbonPremier          { get => (RIB1 & (1 << 6)) == 1 << 6; set => RIB1 = (byte)((RIB1 & ~(1 << 6)) | (value ? 1 << 6 : 0)); }
    public bool RIB1_7                 { get => (RIB1 & (1 << 7)) == 1 << 7; set => RIB1 = (byte)((RIB1 & ~(1 << 7)) | (value ? 1 << 7 : 0)); }

    // Meta Accessible Properties
    public override int[] IVs
    {
        get => new[] { IV_HP, IV_ATK, IV_DEF, IV_SPE, IV_SPA, IV_SPD };
        set
        {
            if (value.Length != 6) return;
            IV_HP = value[0]; IV_ATK = value[1]; IV_DEF = value[2];
            IV_SPE = value[3]; IV_SPA = value[4]; IV_SPD = value[5];
        }
    }

    public override void GetIVs(Span<int> value)
    {
        if (value.Length != 6)
            return;
        value[0] = IV_HP;
        value[1] = IV_ATK;
        value[2] = IV_DEF;
        value[3] = IV_SPE;
        value[4] = IV_SPA;
        value[5] = IV_SPD;
    }

    public int[] EVs
    {
        get => new[] { EV_HP, EV_ATK, EV_DEF, EV_SPE, EV_SPA, EV_SPD };
        set
        {
            if (value.Length != 6) return;
            EV_HP = value[0]; EV_ATK = value[1]; EV_DEF = value[2];
            EV_SPE = value[3]; EV_SPA = value[4]; EV_SPD = value[5];
        }
    }

    public bool IsNicknamed => Nickname.Length > 0 || IsEgg;
    public override int Location { get => MetLocation; set => MetLocation = (ushort)value; }

    public override IReadOnlyList<int> Moves
    {
        get => new[] { Move1, Move2, Move3, Move4 };
        set
        {
            if (value.Count > 0) Move1 = value[0];
            if (value.Count > 1) Move2 = value[1];
            if (value.Count > 2) Move3 = value[2];
            if (value.Count > 3) Move4 = value[3];
        }
    }

    public override IReadOnlyList<int> Relearn
    {
        get => new[] { RelearnMove1, RelearnMove2, RelearnMove3, RelearnMove4 };
        set
        {
            if (value.Count > 0) RelearnMove1 = value[0];
            if (value.Count > 1) RelearnMove2 = value[1];
            if (value.Count > 2) RelearnMove3 = value[2];
            if (value.Count > 3) RelearnMove4 = value[3];
        }
    }

    public override PKM ConvertToPKM(ITrainerInfo tr, EncounterCriteria criteria)
    {
        if (!IsEntity)
            throw new ArgumentException(nameof(IsEntity));

        var rnd = Util.Rand;

        int currentLevel = Level > 0 ? Level : rnd.Next(1, 101);
        int metLevel = MetLevel > 0 ? MetLevel : currentLevel;
        var version = OriginGame != 0 ? OriginGame : (int)this.GetCompatibleVersion((GameVersion)tr.Game);
        var language = Language != 0 ? Language : (int)Core.Language.GetSafeLanguage(Generation, (LanguageID)tr.Language, (GameVersion)version);

        var pi = PersonalTable.USUM.GetFormEntry(Species, Form);
        PK7 pk = new()
        {
            Species = Species,
            HeldItem = HeldItem,
            TID = TID,
            SID = SID,
            Met_Level = metLevel,
            Form = Form,
            EncryptionConstant = EncryptionConstant != 0 ? EncryptionConstant : Util.Rand32(),
            Version = version,
            Language = language,
            Ball = Ball,
            Move1 = Move1, Move2 = Move2, Move3 = Move3, Move4 = Move4,
            RelearnMove1 = RelearnMove1, RelearnMove2 = RelearnMove2,
            RelearnMove3 = RelearnMove3, RelearnMove4 = RelearnMove4,
            Met_Location = MetLocation,
            Egg_Location = EggLocation,
            CNT_Cool = CNT_Cool,
            CNT_Beauty = CNT_Beauty,
            CNT_Cute = CNT_Cute,
            CNT_Smart = CNT_Smart,
            CNT_Tough = CNT_Tough,
            CNT_Sheen = CNT_Sheen,

            OT_Name = OT_Name.Length > 0 ? OT_Name : tr.OT,
            OT_Gender = OTGender != 3 ? OTGender % 2 : tr.Gender,
            HT_Name = OT_Name.Length > 0 ? tr.OT : string.Empty,
            HT_Gender = OT_Name.Length > 0 ? tr.Gender : 0,
            CurrentHandler = OT_Name.Length > 0 ? 1 : 0,

            EXP = Experience.GetEXP(currentLevel, pi.EXPGrowth),

            // Ribbons
            RibbonCountry = RibbonCountry,
            RibbonNational = RibbonNational,

            RibbonEarth = RibbonEarth,
            RibbonWorld = RibbonWorld,
            RibbonClassic = RibbonClassic,
            RibbonPremier = RibbonPremier,
            RibbonEvent = RibbonEvent,
            RibbonBirthday = RibbonBirthday,
            RibbonSpecial = RibbonSpecial,
            RibbonSouvenir = RibbonSouvenir,

            RibbonWishing = RibbonWishing,
            RibbonChampionBattle = RibbonChampionBattle,
            RibbonChampionRegional = RibbonChampionRegional,
            RibbonChampionNational = RibbonChampionNational,
            RibbonChampionWorld = RibbonChampionWorld,

            OT_Friendship = pi.BaseFriendship,
            OT_Intensity = OT_Intensity,
            OT_Memory = OT_Memory,
            OT_TextVar = OT_TextVar,
            OT_Feeling = OT_Feeling,
            FatefulEncounter = true,

            EV_HP = EV_HP,
            EV_ATK = EV_ATK,
            EV_DEF = EV_DEF,
            EV_SPE = EV_SPE,
            EV_SPA = EV_SPA,
            EV_SPD = EV_SPD,
        };

        if (tr is IRegionOrigin o)
        {
            pk.Country = o.Country;
            pk.Region = o.Region;
            pk.ConsoleRegion = o.ConsoleRegion;
        }
        else
        {
            pk.SetDefaultRegionOrigins();
        }

        pk.SetMaximumPPCurrent();

        if ((tr.Generation > Generation && OriginGame == 0) || !CanBeReceivedByVersion(pk.Version))
        {
            // give random valid game
            do { pk.Version = (int)GameVersion.SN + rnd.Next(4); }
            while (!CanBeReceivedByVersion(pk.Version));
        }

        if (OTGender == 3)
        {
            pk.TID = tr.TID;
            pk.SID = tr.SID;
        }

        pk.MetDate = Date ?? DateTime.Now;

        pk.IsNicknamed = IsNicknamed;
        pk.Nickname = IsNicknamed ? Nickname : SpeciesName.GetSpeciesNameGeneration(Species, pk.Language, Generation);

        SetPINGA(pk, criteria);

        if (IsEgg)
            SetEggMetData(pk);
        pk.CurrentFriendship = pk.IsEgg ? pi.HatchCycles : pi.BaseFriendship;

        pk.RefreshChecksum();
        return pk;
    }

    private void SetEggMetData(PKM pk)
    {
        pk.IsEgg = true;
        pk.EggMetDate = Date;
        pk.Nickname = SpeciesName.GetEggName(pk.Language, Generation);
        pk.IsNicknamed = true;
    }

    private void SetPINGA(PKM pk, EncounterCriteria criteria)
    {
        var pi = PersonalTable.USUM.GetFormEntry(Species, Form);
        pk.Nature = (int)criteria.GetNature((Nature)Nature);
        pk.Gender = criteria.GetGender(Gender, pi);
        var av = GetAbilityIndex(criteria);
        pk.RefreshAbility(av);
        SetPID(pk);
        SetIVs(pk);
    }

    private int GetAbilityIndex(EncounterCriteria criteria) => AbilityType switch
    {
        00 or 01 or 02 => AbilityType, // Fixed 0/1/2
        03 or 04 => criteria.GetAbilityFromNumber(Ability), // 0/1 or 0/1/H
        _ => throw new ArgumentOutOfRangeException(nameof(AbilityType)),
    };

    public override AbilityPermission Ability => AbilityType switch
    {
        0 => AbilityPermission.OnlyFirst,
        1 => AbilityPermission.OnlySecond,
        2 => AbilityPermission.OnlyHidden,
        3 => AbilityPermission.Any12,
        _ => AbilityPermission.Any12H,
    };

    private void SetPID(PKM pk)
    {
        switch (PIDType)
        {
            case ShinyType6.FixedValue: // Specified
                pk.PID = PID;
                break;
            case ShinyType6.Random: // Random
                pk.PID = Util.Rand32();
                break;
            case ShinyType6.Always: // Random Shiny
                pk.PID = Util.Rand32();
                pk.PID = (uint)(((pk.TID ^ pk.SID ^ (pk.PID & 0xFFFF)) << 16) | (pk.PID & 0xFFFF));
                break;
            case ShinyType6.Never: // Random Nonshiny
                pk.PID = Util.Rand32();
                if (pk.IsShiny) pk.PID ^= 0x10000000;
                break;
        }
    }

    private void SetIVs(PKM pk)
    {
        Span<int> finalIVs = stackalloc int[6];
        GetIVs(finalIVs);
        var ivflag = finalIVs.Find(iv => (byte)(iv - 0xFC) < 3);
        var rng = Util.Rand;
        if (ivflag == 0) // Random IVs
        {
            for (int i = 0; i < finalIVs.Length; i++)
            {
                if (finalIVs[i] > 31)
                    finalIVs[i] = rng.Next(32);
            }
        }
        else // 1/2/3 perfect IVs
        {
            int IVCount = ivflag - 0xFB;
            do { finalIVs[rng.Next(6)] = 31; }
            while (finalIVs.Count(31) < IVCount);
            for (int i = 0; i < finalIVs.Length; i++)
            {
                if (finalIVs[i] != 31)
                    finalIVs[i] = rng.Next(32);
            }
        }
        pk.SetIVs(finalIVs);
    }

    public bool IsAshGreninjaWC7(PKM pk)
    {
        return CardID == 2046 && ((pk.SID << 16) | pk.TID) == 0x79F57B49;
    }

    public override bool IsMatchExact(PKM pk, EvoCriteria evo)
    {
        if (!IsEgg)
        {
            if (OTGender != 3)
            {
                if (SID != pk.SID) return false;
                if (TID != pk.TID) return false;
                if (OTGender != pk.OT_Gender) return false;
            }
            if (!string.IsNullOrEmpty(OT_Name) && OT_Name != pk.OT_Name) return false;
            if (OriginGame != 0 && OriginGame != pk.Version) return false;
            if (EncryptionConstant != 0 && EncryptionConstant != pk.EncryptionConstant) return false;
            if (Language != 0 && Language != pk.Language) return false;
        }

        if (Form != evo.Form && !FormInfo.IsFormChangeable(Species, Form, pk.Form, pk.Format))
            return false;

        if (IsEgg)
        {
            if (EggLocation != pk.Egg_Location) // traded
            {
                if (pk.Egg_Location != Locations.LinkTrade6)
                    return false;
            }
            else if (PIDType == 0 && pk.IsShiny)
            {
                return false; // can't be traded away for un-shiny
            }

            if (pk.IsEgg && !pk.IsNative)
                return false;
        }
        else
        {
            if (!Shiny.IsValid(pk)) return false;
            if (!IsMatchEggLocation(pk)) return false;
            if (MetLocation != pk.Met_Location) return false;
        }

        if (MetLevel != pk.Met_Level) return false;
        if (Ball != pk.Ball) return false;
        if (OTGender < 3 && OTGender != pk.OT_Gender) return false;
        if (Nature != -1 && pk.Nature != Nature) return false;
        if (Gender != 3 && Gender != pk.Gender) return false;

        if (pk is IContestStats s && s.IsContestBelow(this))
            return false;

        if (CardID is 1122 or 1133 && !CanBeReceivedByVersion(pk.Version))
            return false; // Each version pair has a separate card -- since we aren't using deferral/partial match logic to reorder, just return false.
        if (CardID == 2046) // Greninja WC has variant PID and can arrive @ 36 or 37
            return pk.SM; // not USUM

        return PIDType != 0 || pk.PID == PID;
    }

    public override GameVersion Version
    {
        get => CardID == 2046 ? GameVersion.SM : GameVersion.Gen7;
        set { }
    }

    protected override bool IsMatchDeferred(PKM pk) => Species != pk.Species;

    protected override bool IsMatchPartial(PKM pk)
    {
        if (RestrictLanguage != 0 && RestrictLanguage != pk.Language)
            return true;
        if (!CanBeReceivedByVersion(pk.Version))
            return true;
        return false;
    }
}