//#define HAVE_GRN_REFERENCE // when defined enabled GRN_REFERNCE in Header, else it is disabled
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using gr2lib.core.interfaces;
using gr2lib.core.helpers;
using System.Diagnostics;
using gr2lib.core.exceptions;

namespace gr2lib.core.coreclasses.header
{
    public class granny_header : igranny_header
    {
        private const int GrannyGRNExtraTagCount = 4;
        private const int GrannyGRNReservedUnusedCount = 3;

        public granny_header()
        {
            this.ExtraTags = new int[GrannyGRNExtraTagCount];
            this.ReservedUnused = new int[GrannyGRNReservedUnusedCount];

            this.Version = 0;
            this.TotalSize = 0;
            this.CRC = 0;
            this.SectionArrayOffset = 0;
            this.SectionArrayCount = 0;
#if HAVE_GRN_REFERENCE
            this.RootObjectTypeDefinition = new granny_reference();
            this.RootObject = new granny_reference();
#endif
            this.TypeTag = 0;
            this.StringDatabaseCRC = 0;

            for (int i = 0; i < GrannyGRNExtraTagCount; i++) { this.ExtraTags[i] = 0; }
            for (int i = 0; i < GrannyGRNReservedUnusedCount; i++) { this.ReservedUnused[i] = 0; }
        }

        internal static granny_header ReadFromMemory(IntPtr pointer)
        {
            try
            {
                if (pointer == IntPtr.Zero) return null;
                gr2lib.core.coretypes.native.granny_grn_file_header native = Helpers.ReadFromMemory<gr2lib.core.coretypes.native.granny_grn_file_header>(pointer);
                granny_header managed = ReadFromNative(native);
                managed.NativePointer = pointer;
                return managed;
            }
            catch (Exception ex)
            {
                StackTrace st = new StackTrace(true);
#if  ENABLE_EXCEPTION_OUTPUT_TO_CONSOLE
                Granny2ExceptionWriter.WriteToConsole(ex,st);
#endif
                return default(granny_header);
            }
        }
        internal static granny_header ReadFromNative(gr2lib.core.coretypes.native.granny_grn_file_header native)
        {
            try
            {
                granny_header managed = new granny_header();

                managed.Version = native.Version;
                managed.TotalSize = native.TotalSize;
                managed.CRC = native.CRC;
                managed.SectionArrayOffset = native.SectionArrayOffset;
                managed.SectionArrayCount = native.SectionArrayCount;

                // grn_reference

#if HAVE_GRN_REFERENCE
                if (native.RootObjectTypeDefinition != IntPtr.Zero)
                {
                    //managed.RootObjectTypeDefinition = granny_reference.ReadFromMemory(native.RootObjectTypeDefinition);
                    managed.RootObjectTypeDefinition = new granny_reference();
                }
                if (native.RootObject != IntPtr.Zero)
                {
                    //managed.RootObject = granny_reference.ReadFromMemory(native.RootObject);
                    managed.RootObject = new granny_reference();
                }
#endif

                //managed.TypeTag = native.TypeTag;
                managed.ExtraTags = native.ExtraTags;
                managed.StringDatabaseCRC = native.StringDatabaseCRC;
                managed.ReservedUnused = native.ReservedUnused;
                //process header
                return managed;
            }
            catch (Exception ex)
            {
                StackTrace st = new StackTrace(true);
#if  ENABLE_EXCEPTION_OUTPUT_TO_CONSOLE
                Granny2ExceptionWriter.WriteToConsole(ex,st);
#endif
                return default(granny_header);
            }
        }

        #region INativePointer Members
        private IntPtr _NativePointer;
        public IntPtr NativePointer { get { return _NativePointer; } set { _NativePointer = value; } }
        #endregion

        #region igranny_header members

        private Int32 _Version;
        private Int32 _TotalSize;
        private Int32 _CRC;
        private Int32 _SectionArrayOffset;
        private Int32 _SectionArrayCount;
#if HAVE_GRN_REFERENCE
        private granny_reference _RootObjectTypeDefinition;
        private granny_reference _RootObject;
#endif
        private Int32 _TypeTag;
        private Int32[] _ExtraTags; //4
        private Int32 _StringDatabaseCRC;
        private Int32[] _ReservedUnused; //3


        public Int32 Version { get { return _Version; } set { _Version = value; } }
        public Int32 TotalSize { get { return _TotalSize; } set { _TotalSize = value; } }
        public Int32 CRC { get { return _CRC; } set { _CRC = value; } }
        public Int32 SectionArrayOffset { get { return _SectionArrayOffset; } set { _SectionArrayOffset = value; } }
        public Int32 SectionArrayCount { get { return _SectionArrayCount; } set { _SectionArrayCount = value; } }
#if HAVE_GRN_REFERENCE
        public granny_reference RootObjectTypeDefinition { get { return _RootObjectTypeDefinition; } set { _RootObjectTypeDefinition = value; } }
        public granny_reference RootObject { get { return _RootObject; } set { _RootObject = value; } }
#endif
        public Int32 TypeTag { get { return _TypeTag; } set { _TypeTag = value; } }
        public Int32[] ExtraTags { get { return _ExtraTags; } set { if (value.Length > GrannyGRNExtraTagCount) throw new InvalidOperationException("The size of ExtraTags cannot be greater than " + GrannyGRNExtraTagCount); _ExtraTags = value; } } //4
        public Int32 StringDatabaseCRC { get { return _StringDatabaseCRC; } set { _StringDatabaseCRC = value; } }
        public Int32[] ReservedUnused { get { return _ReservedUnused; } set { if (value.Length > GrannyGRNReservedUnusedCount) throw new InvalidOperationException("The size of ReservedUnused cannot be greater than " + GrannyGRNReservedUnusedCount); _ReservedUnused = value; } } //3
        #endregion
    }
}