//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="InternalIO.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
//     Permission is hereby granted, free of charge, to any person 
//     obtaining a copy of this software and associated documentation 
//     files (the “Software”), to deal in the Software without restriction, 
//     including without limitation the rights to use, copy, modify, merge,
//     publish, distribute, sublicense, and/or sell copies of the Software, 
//     and to permit persons to whom the Software is furnished to do so, 
//     subject to the following conditions:
//     
//     The above copyright notice and 
//     this permission notice shall be included in all copies 
//     or substantial portions of the Software.
//     
//     THE SOFTWARE IS PROVIDED “AS IS”, 
//     WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
//     INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
//     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
//     IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
//     DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
//     ARISING FROM, OUT OF OR IN CONNECTION WITH 
//     THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//     
//-----------------------------------------------------------------------
//-----------------------------------------------------------------------

using StgSharp.Graphics;
using StgSharp.Graphics.OpenGL;

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

using System.Text;
using System.Threading;

namespace StgSharp.Internal
{
    internal static unsafe partial class InternalIO
    {

        internal const string SS_errorLog =
            "SS_errorlog.log";

        internal const string SSC_libName =
            "StgSharp.C";

        internal static Dictionary<TypeCode, uint> GLtype =
            new Dictionary<TypeCode, uint>();

        internal static readonly GCHandle ssc_logHandle =
            GCHandle.Alloc( new byte[512], GCHandleType.Pinned );

        internal static IntPtr SSClibPtr = IntPtr.Zero;

        internal static SemaphoreSlim logSyncSemaphore = new SemaphoreSlim(
            1, 1 );

        static InternalIO()
        {
            GLtype.Add( TypeCode.Single, glConst.FLOAT );
            GLtype.Add( TypeCode.Int32, glConst.INT );
            GLtype.Add( TypeCode.UInt32, glConst.UNSIGNED_INT );
            GLtype.Add( TypeCode.Int16, glConst.SHORT );
            GLtype.Add( TypeCode.UInt16, glConst.UNSIGNED_SHORT );
            GLtype.Add( TypeCode.SByte, glConst.BYTE );
            GLtype.Add( TypeCode.Byte, glConst.UNSIGNED_BYTE );
        }

        internal static void InternalAppendLog( string log )
        {
            if( !File.Exists( SS_errorLog ) ) {
                FileStream stream = File.Create( SS_errorLog );
                stream.Close();
            }

            using( StreamWriter logStream = File.AppendText( SS_errorLog ) ) {
                logStream.WriteLine( log );
            }
        }

        [Obsolete( "Not completed", true )]
        internal static IntPtr InternalLoadProc<T>( IntPtr lib, string name )
            where T: Delegate
        {
            try {
                IntPtr procPtr =
#if WINDOWS
                    IntPtr.Zero;
                #elif LINUX

                #else
                    IntPtr.Zero;

                #endif
                return procPtr;
            }
            catch( Exception ) {
                throw;
            }
        }

        internal static void InternalWriteLog( string logLine, LogType logType )
        {
            logSyncSemaphore.Wait();
            if( !File.Exists( SS_errorLog ) ) {
                FileStream stream = File.Create( SS_errorLog );
                stream.Close();
            }

            using( StreamWriter logStream = File.AppendText( SS_errorLog ) ) {
                logStream.WriteLine(
                    $"{logType}\t{DateTime.Now.ToString("o")}" );
                logStream.WriteLine( logLine );
            }
            logSyncSemaphore.Release();
        }

        internal static void InternalWriteLog(
                                     string beforeTime,
                                     string logLine,
                                     LogType logType )
        {
            logSyncSemaphore.Wait();
            if( !File.Exists( SS_errorLog ) ) {
                FileStream stream = File.Create( SS_errorLog );
                stream.Close();
            }

            using( StreamWriter logStream = File.AppendText( SS_errorLog ) ) {
                logStream.WriteLine( beforeTime );
                logStream.WriteLine(
                    $"{logType}\t@\t{DateTime.Now.ToString("o")}" );
                logStream.WriteLine( logLine );
            }
            logSyncSemaphore.Release( 1 );
        }

    }
}