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 RecordINdex
    {
        public ushort opcode;
        public ushort length;
        public uint notUsed;
        public uint firstrowUsed;            //zero based
        public uint lastRowUsedplus;         //zero based
        public uint defColOffset;
    }

    internal class INdex : IRecords
    {
        RecordINdex index;
        int m_NumberOfRowBlocks;
        uint[] m_RowBlockOffsets;

        public INdex()
        {
            index.opcode = 0x20B;
            index.firstrowUsed = 0x0;
            index.lastRowUsedplus = 0x0;
        }

        public ushort ID
        {
            get {return index.opcode;}
        }

        public ushort RecordSize
        {
            get { return (ushort)(20 + 4 * m_NumberOfRowBlocks);}
        }

        public uint FirstRowIndex
        {
            set { index.firstrowUsed = value; }
        }

        public uint LastRowIndex
        {
            set { index.lastRowUsedplus = value; }
        }

        public uint DefColumnRecordOffset
        {
            set { index.defColOffset = value; }
        }

        public uint[] DBCellOffsets
        //public List<int> DBCellOffsets
        {
            set 
            {
                //m_NumberOfRowBlocks = (int)value.Length;
                m_NumberOfRowBlocks = value.Length;
                m_RowBlockOffsets = value;
            }
        }

        #region IRecords ³ΙΤ±

        public byte[] GetByte()
        {
            byte[] b;
            int ln = 20 + (4 * m_NumberOfRowBlocks);

            b = new byte[ln];
            index.length = (ushort)(ln - 4);
            Globals.GetStructToBytes(index).CopyTo(b, 0);

            int pos = 20;
            for (int i = 0; i < m_NumberOfRowBlocks; i++, pos += 4)
            {
                BitConverter.GetBytes(m_RowBlockOffsets[i]).CopyTo(b, pos);
            }

            return b;
        }

        #endregion
        }
}