using System;
using System.Linq;

namespace PKHeX.Core
{
    public sealed class Mail3 : Mail
    {
        public const int SIZE = 0x24;
        private readonly bool JP;

        public Mail3() : base(new byte[SIZE], -1) => ResetData();
        public Mail3(byte[] data, int ofs, bool japanese) : base(data, ofs) => JP = japanese;

        private void ResetData()
        {
            for (int y = 0; y < 3; y++)
            {
                for (int x = 0; x < 3; x++)
                    SetMessage(y, x, 0xFFFF);
            }

            AuthorName = string.Empty;
            AuthorTID = 0;
            AuthorTID = 0;
            AppearPKM = 1;
            MailType = 0;
        }

        public override ushort GetMessage(int index1, int index2) => BitConverter.ToUInt16(Data, ((index1 * 3) + index2) * 2);
        public override void SetMessage(int index1, int index2, ushort value) => BitConverter.GetBytes(value).CopyTo(Data, ((index1 * 3) + index2) * 2);

        public override string AuthorName
        {
            get => StringConverter3.GetString3(Data, 0x12, 7, JP);
            set
            {
                if (value.Length == 0)
                {
                    Enumerable.Repeat<byte>(0xFF, 8).ToArray().CopyTo(Data, 0x12);
                }
                else
                {
                    Data[0x18] = Data[0x19] = 0xFF;
                    StringConverter3.SetString3(value, 7, JP, 6).CopyTo(Data, 0x12);
                }
            }
        }

        public override ushort AuthorTID { get => BitConverter.ToUInt16(Data, 0x1A); set => BitConverter.GetBytes(value).CopyTo(Data, 0x1A); }
        public override ushort AuthorSID { get => BitConverter.ToUInt16(Data, 0x1C); set => BitConverter.GetBytes(value).CopyTo(Data, 0x1C); }
        public override int AppearPKM { get => BitConverter.ToUInt16(Data, 0x1E); set => BitConverter.GetBytes((ushort)(value == 0 ? 1 : value)).CopyTo(Data, 0x1E); }
        public override int MailType { get => BitConverter.ToUInt16(Data, 0x20); set => BitConverter.GetBytes((ushort)value).CopyTo(Data, 0x20); }

        public override bool? IsEmpty => MailType switch
        {
            0 => true,
            >= 0x79 and <= 0x84 => false,
            _ => null
        };

        public override void SetBlank() => (new Mail3()).Data.CopyTo(Data, 0);
    }
}