using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using gr2lib.core.interfaces;
using gr2lib.core.exceptions;
using gr2lib.core.apiversion;
using gr2lib.core.coreclasses.header;
using gr2lib.core.coretypes;
using gr2lib.core.helpers;
using gr2lib.core.coretypes.implementation;

namespace gr2lib.core.header
{
    public class granny_file : igranny_file
    {
        //private const int GrannyGRNExtraTagCount = 4;
        //private const int GrannyGRNMagixValueCount = 4;
        //private const int GrannyGRNReservedUnusedCount = 3;
        //private const int GrannyGRNReservedCount = 2;
        public granny_file()
        {
            granny2apiloader _loader = new granny2apiloader();
            this.IsByteReversed = false;
            this.Header = new granny_header();
            this.SourceMagicValue = new granny_magic();
            this.SectionCount = 0;
            this.Sections = IntPtr.Zero;
            this.Marshalled = false;
            this.IsUserMemory = false;
            this.ConversionBuffer = IntPtr.Zero;

            this.NativePointer = IntPtr.Zero;
            this.NativeFilePointer = IntPtr.Zero;

            this.GrannyFileInfo = new grnfileinfo();
        }

        private void Initialize()
        {
        }

        public void Dispose()
        {
            if (NativeFilePointer == IntPtr.Zero) return;
            coreapi.FreeFile(NativeFilePointer);
        }


        //internal static granny_file ReadFromMemory(IntPtr pointer)
        //{
        //    if (pointer == IntPtr.Zero) return null;
        //    gr2lib.core.coretypes.native.granny_file native = Helpers.ReadFromMemory<gr2lib.core.coretypes.native.granny_file>(pointer);
        //    granny_file managed = new granny_file();
        //    managed.NativePointer = pointer;

        //    // process
           

        //    return managed;
        //}
        internal static void ReadFromMemory(string filename, ref granny_file grn_file)
        {
            //if (grn_file.NativePointer == IntPtr.Zero) return;
            gr2lib.core.coretypes.native.granny_file native = Helpers.ReadFromMemory<gr2lib.core.coretypes.native.granny_file>(grn_file.NativePointer);
            granny_file managed = new granny_file();
            managed.NativePointer = grn_file.NativeFilePointer;

            // process

            managed.IsByteReversed = native.IsByteReversed;
            managed.SectionCount = native.SectionCount;
            managed.Sections = native.Sections;
            managed.Marshalled = native.Marshalled;
            managed.IsUserMemory = native.IsUserMemory;
            managed.ConversionBuffer = native.ConversionBuffer;

            if (native.Header != IntPtr.Zero)
            {
                managed.Header = granny_header.ReadFromMemory(native.Header);
                managed.Header.TypeTag = coreapi.GrannyGetFileTypeTag(grn_file.NativePointer);
            }
            else
            {
                managed.Header = new granny_header();
            }

            if (native.SourceMagicValue != IntPtr.Zero)
            {
                managed.SourceMagicValue = granny_magic.ReadFromMemory(native.SourceMagicValue);
            }
            else
            {
                managed.SourceMagicValue = new granny_magic();
            }

            grn_file.NativeFilePointer = coreapi.GetFileInfo(grn_file.NativePointer);
            managed.NativeFilePointer = grn_file.NativeFilePointer;
            managed.GrannyFileInfo = grnfileinfo.ReadFromMemory(managed.NativeFilePointer);
            
            grn_file = managed;
        }

        //public static void ReadFromFile(string filename, out granny_file grn_file)
        //{
        //    grn_file = new granny_file();
        //    grn_file.NativePointer = coreapi.GrannyReadEntireFile(filename);
        //    if (grn_file.NativePointer == null || grn_file.NativePointer == IntPtr.Zero)
        //    {
        //        Console.WriteLine("Error: unable to load {0} as a Granny file.", filename);
        //    }

        //    grn_file.NativeFilePointer = coreapi.GetFileInfo(grn_file.NativePointer);
        //    ReadFromMemory(out grn_file);
        //    coreapi.FreeFile(grn_file.NativePointer);
        //}

        public static granny_file ReadFromFile(string filename)
        {
            granny_file grn_file = new granny_file();
            grn_file.NativePointer = coreapi.GrannyReadEntireFile(filename);
            if (grn_file.NativePointer == null || grn_file.NativePointer == IntPtr.Zero)
            {
                Console.WriteLine("Error: unable to load {0} as a Granny file.", filename);
            }

            ReadFromMemory(filename, ref grn_file);
            coreapi.FreeFile(grn_file.NativePointer);
            return grn_file;
        }

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

        #region igranny2header members

        private bool _IsByteReversed;
        private granny_header _header;
        private granny_magic _SourceMagicValue;
        private int _SectionCount;
        private IntPtr _Sections;
        private bool _Marshalled;
        private bool _IsUserMemory;
        private IntPtr _ConversionBuffer;


        private grnfileinfo _GrannyFileInfo;

        public grnfileinfo GrannyFileInfo { get { return _GrannyFileInfo; } set { _GrannyFileInfo = value; } }
        public bool IsByteReversed { get { return _IsByteReversed; } set { _IsByteReversed = value; } }
        public granny_header Header { get { return _header; } set { _header = value; } }
        public granny_magic SourceMagicValue { get { return _SourceMagicValue; } set { _SourceMagicValue = value; } }
        public int SectionCount { get { return _SectionCount; } set { _SectionCount = value; } }
        public IntPtr Sections { get { return _Sections; } set { _Sections = value; } }
        public bool Marshalled { get { return _Marshalled; } set { _Marshalled = value; } }
        public bool IsUserMemory { get { return _IsUserMemory; } set { _IsUserMemory = value; } }
        public IntPtr ConversionBuffer { get { return _ConversionBuffer; } set { _ConversionBuffer = value; } }
        #endregion
    }
}