using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using Biff8Excel.Interfaces;

namespace Biff8Excel.Records
{
    [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Auto, Pack = 1)]
    struct RecordBoundSheet
    {
        public ushort opcode; // 0x85;
        public ushort length;
        public uint streamPosition;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]        public byte visibility;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]        public byte sheetType;      // = 0x0;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]        public byte namelength;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]        public byte zero;           // Unicode flag (compressed String)
    }

    internal class BoundSheet : IRecords
    {
        RecordBoundSheet boundsheet;
        string sheetName;
        byte[] sheetNameBytes;
        ushort recLen;
        
        public BoundSheet()
        {
            boundsheet.opcode = 0x85;
            boundsheet.sheetType = 0x0;
            boundsheet.zero = 0x0;
        }

        internal ushort ID
        {
            get{ return boundsheet.opcode ;}
        }

        internal ushort RecordSize
        {
            get { return recLen; }
        }

        internal uint StreamPosition
        {
            set {boundsheet.streamPosition = value;}
        }

        internal string StreamName
        {
            set 
            {
                sheetName = value;
                if (sheetName.Length != Globals.GetDefaultBytesLength(sheetName))
                {
                    boundsheet.zero = 0x1;
                    sheetNameBytes = Globals.GetUnicodeBytes(sheetName);
                }
                else
                {
                    boundsheet.zero = 0x0;
                    sheetNameBytes = Globals.GetDefaultBytes(sheetName);
                }
            }
        }

        internal byte Visible 
        {
            set {boundsheet.visibility |= value;}
        }

        #region IRecords 成员

        public byte[] GetByte()
        {
            byte[] b;
            if (sheetName == null)
                throw new Biff8ExcelException("请先设定sheetName");
            //recLen = (ushort)(sheetName.Length + 12);

            //recLen = (ushort)(Globals.GetUnicodeByteLength(sheetName) + 12);
            recLen = (ushort)(sheetNameBytes.Length + 12);

            b = new byte[recLen];

            boundsheet.length = (ushort)(b.Length - 4);
            //boundsheet.namelength = (byte)(Globals.GetByteLength(sheetName));
            boundsheet.namelength = (byte)sheetName.Length;

            Globals.GetStructToBytes(boundsheet).CopyTo(b, 0);
            //Globals.GetBytes(sheetName).CopyTo(b, 12);
            //Globals.GetUnicodeBytes(sheetName).CopyTo(b, 12);
            sheetNameBytes.CopyTo(b, 12);

            return b;
        }

        #endregion
    }
}