using System;
using System.Collections.Generic;

namespace PKHeX.Core
{
    /// <summary> Generation 3 <see cref="PKM"/> format, exclusively for Pokémon Colosseum. </summary>
    public sealed class CK3 : G3PKM, IShadowPKM
    {
        private static readonly ushort[] Unused =
        {
            0x11, 0x12, 0x13,
            0x61, 0x62, 0x63, 0x64,
            0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xDA, 0xDB,
            0xE4, 0xE5, 0xE6, 0xE7, 0xCE,
            0xFB, // not fateful -- what is it?
            0xD7, // index within party
            // 0xFC onwards unused? no, it's some pointers and values used by the game?
        };

        public override IReadOnlyList<ushort> ExtraBytes => Unused;

        public override int SIZE_PARTY => PokeCrypto.SIZE_3CSTORED;
        public override int SIZE_STORED => PokeCrypto.SIZE_3CSTORED;
        public override int Format => 3;
        public override PersonalInfo PersonalInfo => PersonalTable.RS[Species];
        public CK3(byte[] data) : base(data) { }
        public CK3() : this(new byte[PokeCrypto.SIZE_3CSTORED]) { }
        public override PKM Clone() => new CK3((byte[])Data.Clone());

        private string GetString(int offset, int count) => StringConverter3.GetBEString3(Data, offset, count);
        private static byte[] SetString(string value, int maxLength) => StringConverter3.SetBEString3(value, maxLength);

        // Trash Bytes
        public override Span<byte> Nickname_Trash { get => Data.AsSpan(0x2E, 20); set { if (value.Length == 20) value.CopyTo(Data.AsSpan(0x2E)); } }
        public override Span<byte> OT_Trash { get => Data.AsSpan(0x18, 20); set { if (value.Length == 20) value.CopyTo(Data.AsSpan(0x18)); } }

        // Future Attributes

        // Silly Attributes
        public override ushort Sanity { get => 0; set { } } // valid flag set in pkm structure.
        public override ushort Checksum { get => Checksums.CRC16_CCITT(Data); set { } } // totally false, just a way to get a 'random' ident for the pkm.
        public override bool ChecksumValid => true;
        public override bool Valid { get => !Invalid; set => Invalid = !value; }

        public override int Species { get => SpeciesConverter.GetG4Species(BigEndian.ToUInt16(Data, 0x00)); set => BigEndian.GetBytes((ushort)SpeciesConverter.GetG3Species(value)).CopyTo(Data, 0x00); }
        // 02-04 unused
        public override uint PID { get => BigEndian.ToUInt32(Data, 0x04); set => BigEndian.GetBytes(value).CopyTo(Data, 0x04); }
        public override int Version { get => GetGBAVersionID(Data[0x08]); set => Data[0x08] = GetGCVersionID(value); }
        public int CurrentRegion { get => Data[0x09]; set => Data[0x09] = (byte)value; }
        public int OriginalRegion { get => Data[0x0A]; set => Data[0x0A] = (byte)value; }
        public override int Language { get => Core.Language.GetMainLangIDfromGC(Data[0x0B]); set => Data[0x0B] = Core.Language.GetGCLangIDfromMain((byte)value); }
        public override int Met_Location { get => BigEndian.ToUInt16(Data, 0x0C); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x0C); }
        public override int Met_Level { get => Data[0x0E]; set => Data[0x0E] = (byte)value; }
        public override int Ball { get => Data[0x0F]; set => Data[0x0F] = (byte)value; }
        public override int OT_Gender { get => Data[0x10]; set => Data[0x10] = (byte)value; }
        public override int SID { get => BigEndian.ToUInt16(Data, 0x14); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x14); }
        public override int TID { get => BigEndian.ToUInt16(Data, 0x16); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x16); }
        public override string OT_Name { get => GetString(0x18, 20); set => SetString(value, 10).CopyTo(Data, 0x18); } // +2 terminator
        public override string Nickname { get => GetString(0x2E, 20); set { SetString(value, 10).CopyTo(Data, 0x2E); NicknameCopy = value; } } // +2 terminator
        public string NicknameCopy { get => GetString(0x44, 20); set => SetString(value, 10).CopyTo(Data, 0x44); } // +2 terminator
        public override uint EXP { get => BigEndian.ToUInt32(Data, 0x5C); set => BigEndian.GetBytes(value).CopyTo(Data, 0x5C); }
        public override int Stat_Level { get => Data[0x60]; set => Data[0x60] = (byte)value; }

        // 0x64-0x77 are battle/status related
        public override int Status_Condition { get; set; } // where are we
        // Not that the program cares

        // Moves
        public override int Move1 { get => BigEndian.ToUInt16(Data, 0x78); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x78); }
        public override int Move1_PP { get => Data[0x7A]; set => Data[0x7A] = (byte)value; }
        public override int Move1_PPUps { get => Data[0x7B]; set => Data[0x7B] = (byte)value; }
        public override int Move2 { get => BigEndian.ToUInt16(Data, 0x7C); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x7C); }
        public override int Move2_PP { get => Data[0x7E]; set => Data[0x7E] = (byte)value; }
        public override int Move2_PPUps { get => Data[0x7F]; set => Data[0x7F] = (byte)value; }
        public override int Move3 { get => BigEndian.ToUInt16(Data, 0x80); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x80); }
        public override int Move3_PP { get => Data[0x82]; set => Data[0x82] = (byte)value; }
        public override int Move3_PPUps { get => Data[0x83]; set => Data[0x83] = (byte)value; }
        public override int Move4 { get => BigEndian.ToUInt16(Data, 0x84); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x84); }
        public override int Move4_PP { get => Data[0x86]; set => Data[0x86] = (byte)value; }
        public override int Move4_PPUps { get => Data[0x87]; set => Data[0x87] = (byte)value; }

        public override int SpriteItem => ItemConverter.GetItemFuture3((ushort)HeldItem);
        public override int HeldItem { get => BigEndian.ToUInt16(Data, 0x88); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x88); }

        // More party stats
        public override int Stat_HPCurrent { get => BigEndian.ToUInt16(Data, 0x8A); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x8A); }
        public override int Stat_HPMax { get => BigEndian.ToUInt16(Data, 0x8C); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x8C); }
        public override int Stat_ATK { get => BigEndian.ToUInt16(Data, 0x8E); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x8E); }
        public override int Stat_DEF { get => BigEndian.ToUInt16(Data, 0x90); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x90); }
        public override int Stat_SPA { get => BigEndian.ToUInt16(Data, 0x92); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x92); }
        public override int Stat_SPD { get => BigEndian.ToUInt16(Data, 0x94); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x94); }
        public override int Stat_SPE { get => BigEndian.ToUInt16(Data, 0x96); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0x96); }

        // EVs
        public override int EV_HP {
            get => Math.Min(byte.MaxValue, BigEndian.ToUInt16(Data, 0x98));
            set => BigEndian.GetBytes((ushort)(value & 0xFF)).CopyTo(Data, 0x98); }

        public override int EV_ATK {
            get => Math.Min(byte.MaxValue, BigEndian.ToUInt16(Data, 0x9A));
            set => BigEndian.GetBytes((ushort)(value & 0xFF)).CopyTo(Data, 0x9A); }

        public override int EV_DEF {
            get => Math.Min(byte.MaxValue, BigEndian.ToUInt16(Data, 0x9C));
            set => BigEndian.GetBytes((ushort)(value & 0xFF)).CopyTo(Data, 0x9C); }

        public override int EV_SPA {
            get => Math.Min(byte.MaxValue, BigEndian.ToUInt16(Data, 0x9E));
            set => BigEndian.GetBytes((ushort)(value & 0xFF)).CopyTo(Data, 0x9E); }

        public override int EV_SPD {
            get => Math.Min(byte.MaxValue, BigEndian.ToUInt16(Data, 0xA0));
            set => BigEndian.GetBytes((ushort)(value & 0xFF)).CopyTo(Data, 0xA0); }

        public override int EV_SPE {
            get => Math.Min(byte.MaxValue, BigEndian.ToUInt16(Data, 0xA2));
            set => BigEndian.GetBytes((ushort)(value & 0xFF)).CopyTo(Data, 0xA2); }

        // IVs
        public override int IV_HP {
            get => Math.Min((ushort)31, BigEndian.ToUInt16(Data, 0xA4));
            set => BigEndian.GetBytes((ushort)(value & 0x1F)).CopyTo(Data, 0xA4); }

        public override int IV_ATK {
            get => Math.Min((ushort)31, BigEndian.ToUInt16(Data, 0xA6));
            set => BigEndian.GetBytes((ushort)(value & 0x1F)).CopyTo(Data, 0xA6); }

        public override int IV_DEF {
            get => Math.Min((ushort)31, BigEndian.ToUInt16(Data, 0xA8));
            set => BigEndian.GetBytes((ushort)(value & 0x1F)).CopyTo(Data, 0xA8); }

        public override int IV_SPA {
            get => Math.Min((ushort)31, BigEndian.ToUInt16(Data, 0xAA));
            set => BigEndian.GetBytes((ushort)(value & 0x1F)).CopyTo(Data, 0xAA); }

        public override int IV_SPD {
            get => Math.Min((ushort)31, BigEndian.ToUInt16(Data, 0xAC));
            set => BigEndian.GetBytes((ushort)(value & 0x1F)).CopyTo(Data, 0xAC); }

        public override int IV_SPE {
            get => Math.Min((ushort)31, BigEndian.ToUInt16(Data, 0xAE));
            set => BigEndian.GetBytes((ushort)(value & 0x1F)).CopyTo(Data, 0xAE); }

        public override int OT_Friendship { get => Data[0xB0]; set => Data[0xB0] = (byte)value; }

        // Contest
        public override byte CNT_Cool   { get => Data[0xB2]; set => Data[0xB2] = value; }
        public override byte CNT_Beauty { get => Data[0xB3]; set => Data[0xB3] = value; }
        public override byte CNT_Cute   { get => Data[0xB4]; set => Data[0xB4] = value; }
        public override byte CNT_Smart  { get => Data[0xB5]; set => Data[0xB5] = value; }
        public override byte CNT_Tough  { get => Data[0xB6]; set => Data[0xB6] = value; }
        public override int RibbonCountG3Cool { get => Data[0xB7]; set => Data[0xB7] = (byte)value; }
        public override int RibbonCountG3Beauty { get => Data[0xB8]; set => Data[0xB8] = (byte)value; }
        public override int RibbonCountG3Cute { get => Data[0xB9]; set => Data[0xB9] = (byte)value; }
        public override int RibbonCountG3Smart { get => Data[0xBA]; set => Data[0xBA] = (byte)value; }
        public override int RibbonCountG3Tough { get => Data[0xBB]; set => Data[0xBB] = (byte)value; }
        public override byte CNT_Sheen { get => Data[0xBC]; set => Data[0xBC] = value; }

        // Ribbons
        public override bool RibbonChampionG3       { get => Data[0xBD] == 1; set => Data[0xBD] = value ? (byte)1 : (byte)0; }
        public override bool RibbonWinning          { get => Data[0xBE] == 1; set => Data[0xBE] = value ? (byte)1 : (byte)0; }
        public override bool RibbonVictory          { get => Data[0xBF] == 1; set => Data[0xBF] = value ? (byte)1 : (byte)0; }
        public override bool RibbonArtist           { get => Data[0xC0] == 1; set => Data[0xC0] = value ? (byte)1 : (byte)0; }
        public override bool RibbonEffort           { get => Data[0xC1] == 1; set => Data[0xC1] = value ? (byte)1 : (byte)0; }
        public override bool RibbonChampionBattle   { get => Data[0xC2] == 1; set => Data[0xC2] = value ? (byte)1 : (byte)0; }
        public override bool RibbonChampionRegional { get => Data[0xC3] == 1; set => Data[0xC3] = value ? (byte)1 : (byte)0; }
        public override bool RibbonChampionNational { get => Data[0xC4] == 1; set => Data[0xC4] = value ? (byte)1 : (byte)0; }
        public override bool RibbonCountry          { get => Data[0xC5] == 1; set => Data[0xC5] = value ? (byte)1 : (byte)0; }
        public override bool RibbonNational         { get => Data[0xC6] == 1; set => Data[0xC6] = value ? (byte)1 : (byte)0; }
        public override bool RibbonEarth            { get => Data[0xC7] == 1; set => Data[0xC7] = value ? (byte)1 : (byte)0; }
        public override bool RibbonWorld            { get => Data[0xC8] == 1; set => Data[0xC8] = value ? (byte)1 : (byte)0; }
        public override bool Unused1                { get => ((Data[0xC9] >> 0) & 1) == 1; set => Data[0xC9] = (byte)((Data[0xC9] & ~1) | (value ? 1 : 0)); }
        public override bool Unused2                { get => ((Data[0xC9] >> 1) & 1) == 1; set => Data[0xC9] = (byte)((Data[0xC9] & ~2) | (value ? 2 : 0)); }
        public override bool Unused3                { get => ((Data[0xC9] >> 2) & 1) == 1; set => Data[0xC9] = (byte)((Data[0xC9] & ~4) | (value ? 4 : 0)); }
        public override bool Unused4                { get => ((Data[0xC9] >> 3) & 1) == 1; set => Data[0xC9] = (byte)((Data[0xC9] & ~8) | (value ? 8 : 0)); }
        public override bool FatefulEncounter       { get => ((Data[0xC9] >> 4) & 1) == 1; set => Data[0xC9] = (byte)((Data[0xC9] &~16) | (value ?16 : 0)); }

        public override int PKRS_Strain { get => Data[0xCA] & 0xF; set => Data[0xCA] = (byte)(value & 0xF); }
        public override bool IsEgg { get => Data[0xCB] == 1; set => Data[0xCB] = value ? (byte)1 : (byte)0; }
        public override bool AbilityBit { get => Data[0xCC] == 1; set => Data[0xCC] = value ? (byte)1 : (byte)0; }
        private bool Invalid { get => Data[0xCD] != 0; set => Data[0xCD] = value ? (byte)1 : (byte)0; }

        public override int MarkValue { get => SwapBits(Data[0xCF], 1, 2); protected set => Data[0xCF] = (byte)SwapBits(value, 1, 2); }
        public override int PKRS_Days { get => Math.Max((sbyte)Data[0xD0], (sbyte)0); set => Data[0xD0] = (byte)(value == 0 ? 0xFF : value & 0xF); }

        public int PartySlot { get => Data[0xD7]; set => Data[0xD7] = (byte)value; } // or not; only really used while in party?
        public int ShadowID { get => BigEndian.ToUInt16(Data, 0xD8); set => BigEndian.GetBytes((ushort)value).CopyTo(Data, 0xD8); }
        public int Purification { get => BigEndian.ToInt32(Data, 0xDC); set => BigEndian.GetBytes(value).CopyTo(Data, 0xDC); }
        public uint EXP_Shadow { get => BigEndian.ToUInt32(Data, 0xC0); set => BigEndian.GetBytes(value).CopyTo(Data, 0xC0); }

        public const int Purified = -100;
        public bool IsShadow => ShadowID != 0 && Purification != Purified;

        protected override byte[] Encrypt()
        {
            return (byte[])Data.Clone();
        }

        public PK3 ConvertToPK3()
        {
            var pk = ConvertTo<PK3>();
            pk.RefreshChecksum();
            return pk;
        }
    }
}