namespace PKHeX.Core
{
    /// <summary>
    /// Generation 3 Base <see cref="PKM"/> Class
    /// </summary>
    public abstract class G3PKM : PKM, IRibbonSetEvent3, IRibbonSetCommon3, IRibbonSetUnique3, IRibbonSetOnly3, IContestStats, IContestStatsMutable
    {
        protected G3PKM(byte[] data) : base(data) { }
        protected G3PKM(int size) : base(size) { }

        // Maximums
        public sealed override int MaxMoveID => Legal.MaxMoveID_3;
        public sealed override int MaxSpeciesID => Legal.MaxSpeciesID_3;
        public sealed override int MaxAbilityID => Legal.MaxAbilityID_3;
        public sealed override int MaxItemID => Legal.MaxItemID_3;
        public sealed override int MaxBallID => Legal.MaxBallID_3;
        public sealed override int MaxGameID => Legal.MaxGameID_3;
        public sealed override int MaxIV => 31;
        public sealed override int MaxEV => 255;
        public sealed override int OTLength => 7;
        public sealed override int NickLength => 10;

        // Generated Attributes
        public sealed override int PSV => (int)((PID >> 16 ^ (PID & 0xFFFF)) >> 3);
        public sealed override int TSV => (TID ^ SID) >> 3;
        public sealed override bool Japanese => Language == (int)LanguageID.Japanese;

        public sealed override int Ability { get => ((PersonalInfoG3)PersonalInfo).GetAbility(AbilityBit); set { } }
        public sealed override uint EncryptionConstant { get => PID; set { } }
        public sealed override int Nature { get => (int)(PID % 25); set { } }
        public sealed override bool IsNicknamed { get => SpeciesName.IsNicknamed(Species, Nickname, Language, 3); set { } }
        public sealed override int Gender { get => PKX.GetGenderFromPID(Species, PID); set { } }
        public sealed override int Characteristic => -1;
        public sealed override int CurrentFriendship { get => OT_Friendship; set => OT_Friendship = value; }
        public sealed override int CurrentHandler { get => 0; set { } }
        public sealed override int Egg_Location { get => 0; set { } }

        public abstract ushort SpeciesID3 { get; set; } // raw access

        public sealed override int Form
        {
            get => Species == (int)Core.Species.Unown ? PKX.GetUnownForm(PID) : 0;
            set
            {
                if (Species != (int)Core.Species.Unown)
                    return;
                var rnd = Util.Rand;
                while (PKX.GetUnownForm(PID) != value)
                    PID = Util.Rand32(rnd);
            }
        }

        public sealed override int AbilityNumber { get => 1 << (AbilityBit ? 1 : 0); set => AbilityBit = value > 1; } // [0,1]->[1,2] ; [1,x]->[0,1]
        public abstract bool AbilityBit { get; set; }

        public sealed override void RefreshAbility(int n)
        {
            if (Species is (int)Core.Species.Granbull or (int)Core.Species.Vibrava or (int)Core.Species.Flygon)
                return;
            AbilityBit = n == 1 && ((PersonalInfoG3)PersonalInfo).HasSecondAbility;
        }

        public override bool Valid { get => true; set { } }
        public override void RefreshChecksum() { }
        public override bool ChecksumValid => Valid;

        public abstract bool RibbonEarth { get; set; }
        public abstract bool RibbonNational { get; set; }
        public abstract bool RibbonCountry { get; set; }
        public abstract bool RibbonChampionBattle { get; set; }
        public abstract bool RibbonChampionRegional { get; set; }
        public abstract bool RibbonChampionNational { get; set; }
        public abstract bool RibbonChampionG3 { get; set; }
        public abstract bool RibbonArtist { get; set; }
        public abstract bool RibbonEffort { get; set; }
        public abstract bool RibbonWinning { get; set; }
        public abstract bool RibbonVictory { get; set; }
        public abstract int RibbonCountG3Cool { get; set; }
        public abstract int RibbonCountG3Beauty { get; set; }
        public abstract int RibbonCountG3Cute { get; set; }
        public abstract int RibbonCountG3Smart { get; set; }
        public abstract int RibbonCountG3Tough { get; set; }
        public abstract bool RibbonWorld { get; set; }
        public abstract bool Unused1 { get; set; }
        public abstract bool Unused2 { get; set; }
        public abstract bool Unused3 { get; set; }
        public abstract bool Unused4 { get; set; }

        public abstract byte CNT_Cool   { get; set; }
        public abstract byte CNT_Beauty { get; set; }
        public abstract byte CNT_Cute   { get; set; }
        public abstract byte CNT_Smart  { get; set; }
        public abstract byte CNT_Tough  { get; set; }
        public abstract byte CNT_Sheen  { get; set; }

        /// <summary>
        /// Swaps bits at a given position
        /// </summary>
        /// <param name="value">Value to swap bits for</param>
        /// <param name="p1">Position of first bit to be swapped</param>
        /// <param name="p2">Position of second bit to be swapped</param>
        /// <remarks>Generation 3 marking values are swapped (Square-Triangle, instead of Triangle-Square).</remarks>
        /// <returns>Swapped bits value</returns>
        protected static int SwapBits(int value, int p1, int p2)
        {
            int bit1 = (value >> p1) & 1;
            int bit2 = (value >> p2) & 1;
            int x = bit1 ^ bit2;
            x = (x << p1) | (x << p2);
            return value ^ x;
        }

        protected static byte GetGBAVersionID(byte gc) => (byte)((GCVersion)gc).GetG3VersionID();
        protected static byte GetGCVersionID(int gba) => (byte)((GameVersion)gba).GetCXDVersionID();

        /// <summary>
        /// Interconversion for Generation 3 <see cref="PKM"/> formats.
        /// </summary>
        /// <typeparam name="T">Generation 3 format to convert to</typeparam>
        /// <returns>New object with transferred properties.</returns>
        protected T ConvertTo<T>() where T : G3PKM, new() => new()
        {
            SpeciesID3 = SpeciesID3,
            Language = Language,
            PID = PID,
            TID = TID,
            SID = SID,
            EXP = EXP,
            HeldItem = HeldItem,
            AbilityBit = AbilityBit,
            IsEgg = IsEgg,
            FatefulEncounter = FatefulEncounter,

            Met_Location = Met_Location,
            Met_Level = Met_Level,
            Version = Version,
            Ball = Ball,

            Nickname = Nickname,
            OT_Name = OT_Name,
            OT_Gender = OT_Gender,
            OT_Friendship = OT_Friendship,

            Move1_PPUps = Move1_PPUps,
            Move2_PPUps = Move2_PPUps,
            Move3_PPUps = Move3_PPUps,
            Move4_PPUps = Move4_PPUps,
            Move1 = Move1,
            Move2 = Move2,
            Move3 = Move3,
            Move4 = Move4,
            Move1_PP = Move1_PP,
            Move2_PP = Move2_PP,
            Move3_PP = Move3_PP,
            Move4_PP = Move4_PP,

            IV_HP = IV_HP,
            IV_ATK = IV_ATK,
            IV_DEF = IV_DEF,
            IV_SPE = IV_SPE,
            IV_SPA = IV_SPA,
            IV_SPD = IV_SPD,
            EV_HP = EV_HP,
            EV_ATK = EV_ATK,
            EV_DEF = EV_DEF,
            EV_SPE = EV_SPE,
            EV_SPA = EV_SPA,
            EV_SPD = EV_SPD,
            CNT_Cool = CNT_Cool,
            CNT_Beauty = CNT_Beauty,
            CNT_Cute = CNT_Cute,
            CNT_Smart = CNT_Smart,
            CNT_Tough = CNT_Tough,
            CNT_Sheen = CNT_Sheen,

            PKRS_Days = PKRS_Days,
            PKRS_Strain = PKRS_Strain,

            // Transfer Ribbons
            RibbonCountG3Cool = RibbonCountG3Cool,
            RibbonCountG3Beauty = RibbonCountG3Beauty,
            RibbonCountG3Cute = RibbonCountG3Cute,
            RibbonCountG3Smart = RibbonCountG3Smart,
            RibbonCountG3Tough = RibbonCountG3Tough,
            RibbonChampionG3 = RibbonChampionG3,
            RibbonWinning = RibbonWinning,
            RibbonVictory = RibbonVictory,
            RibbonArtist = RibbonArtist,
            RibbonEffort = RibbonEffort,
            RibbonChampionBattle = RibbonChampionBattle,
            RibbonChampionRegional = RibbonChampionRegional,
            RibbonChampionNational = RibbonChampionNational,
            RibbonCountry = RibbonCountry,
            RibbonNational = RibbonNational,
            RibbonEarth = RibbonEarth,
            RibbonWorld = RibbonWorld,
            Unused1 = Unused1,
            Unused2 = Unused2,
            Unused3 = Unused3,
            Unused4 = Unused4,
        };
    }
}