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

namespace Biff8Excel.Records
{
    [StructLayoutAttribute(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
    struct RecordFont
    {
        public ushort opcode ;
        public ushort length;
        public ushort size;
        public ushort attributes;
        public ushort colourIndex;
        public ushort boldWeight;
        public ushort superSubScript;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]public byte underline;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]public byte family;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]public byte charset;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]public byte zero ;                  // must be zero
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]public byte fontNameLen;
        [MarshalAs(UnmanagedType.U1, SizeConst = 1)]public byte isunicode;              // Flag to store as unicode
    }

    internal class Font : IRecords 
    {
        RecordFont font;
        ushort recLen;
        byte[] m_fontName;

        public Font()
        {
            font.opcode = 0x31;
            this.Size = 10;
            font.boldWeight = 0x190;
            font.zero = 0x0;
            this.FontName = "ËÎÌå";
            //this.FontName = "Tahoma";
            //font.charset = (byte)enumFontCharacterSet.csANSI_Chinese_Simplified;
        }

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

        public ushort RecordSize
        {
            get { return recLen; }
        }

        public ushort Size
        {
            set {
                font.size = (ushort)(value * 20); 
            }
            get 
            {
                if ( font.size > 0)
                    return (ushort)(font.size / 20);
            
                return 0;
            }
        }

        public ushort Attributes
        {
            set 
            {
                font.attributes = value;
                if ((value & 0x1) == 1)
                    font.boldWeight = 0x2BC;
            }
        }

        public ushort ColourIndex
        {
            set { font.colourIndex = value; }
        }

        public ushort BoldWeight
        {
            set { font.boldWeight = value; }
        }

        public ushort Escapement
        {
            set { font.superSubScript = value; }
        }

        public byte Underline
        {
            set { font.underline = value; }
        }

        public byte Family
        {
            set { font.family = value; }
        }

        public byte Charset
        {
            set { font.charset = value; }
        }

        public string FontName
        {
            set
            {                
                font.fontNameLen = (byte)value.Length;
                //m_fontName = Globals.GetUnicodeBytes(value);
                if (font.fontNameLen != (byte)Globals.GetDefaultBytesLength(value))
                {
                    font.isunicode = 0x1;
                    m_fontName = Globals.GetUnicodeBytes(value);
                }
                else
                {
                    font.isunicode = 0x0;
                    m_fontName = Globals.GetDefaultBytes(value);
                }
            }
        }

        #region IRecords ³ÉÔ±

        public byte[] GetByte()
        {
            //font.length = (ushort)((font.fontNameLen * 2) + 16);
            //byte[] b = new byte[(font.fontNameLen * 2) + 20];
            font.length = (ushort)(m_fontName.Length + 16);
            byte[] b = new byte[m_fontName.Length + 20];
            Globals.GetStructToBytes(font).CopyTo(b, 0);
            m_fontName.CopyTo(b, 20);

            return b;
        }

        #endregion
    }
}