//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="ExpCompile.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 CommunityToolkit.HighPerformance.Buffers;

using StgSharp.Collections;

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;

namespace StgSharp.Script.Express
{
    public static partial class ExpCompile
    {
        private static ConcurrentStringHashMultiplexer _multiplexer;
        private static Dictionary<string, ExpElementInstanceBase> _builtinConst;
        private static Dictionary<string, ExpTypeSource> _builtinType;
        private static StringPool _compileStringCache;



        public static Dictionary<string, ExpElementInstanceBase> BuiltinConst => _builtinConst;

        internal static ConcurrentStringHashMultiplexer Multiplexer
        {
            get
            {
                if( _multiplexer == null ) {
                    throw new ExpCompileNotInitializedException();
                }
                return _multiplexer;
            }
        }

        public static string AddOrGetString( string str )
        {
            return _compileStringCache.GetOrAdd( str );
        }

        public static void ClearStringCache()
        {
            _compileStringCache.Reset();
        }

        public static void SkipComment(IScriptSourceProvider source)
        {

        }

        public static void InitCompile()
        {
            _compileStringCache = new StringPool();
            _multiplexer = new ConcurrentStringHashMultiplexer();

            _builtinType = new Dictionary<string, ExpTypeSource>( _multiplexer ) {
                { AddOrGetString( KeyWord.Int ), new ExpBuiltinType(
                    AddOrGetString( KeyWord.Int ),typeof( int ) ) }, 
                { AddOrGetString( KeyWord.Real ), new ExpBuiltinType(
                  AddOrGetString( KeyWord.Real ), typeof( float ) ) }, 
                { AddOrGetString(KeyWord.Bool ), new ExpBuiltinType(
                  AddOrGetString(KeyWord.Bool ), typeof( bool ) ) }, 
                { AddOrGetString(KeyWord.Binary ), new ExpBuiltinType(
                  AddOrGetString(KeyWord.Binary ),typeof( bool ) ) }, 
                { AddOrGetString(KeyWord.String ), new ExpBuiltinType(
                  AddOrGetString(KeyWord.String ),typeof( string ) ) }, 
                { AddOrGetString(KeyWord.Logic ), new ExpBuiltinType(
             AddOrGetString(KeyWord.Logic ), typeof( Logic ) ) } };

            _builtinConst = new Dictionary<string, ExpElementInstanceBase>(
                _multiplexer ) {
                { AddOrGetString( "PI" ), new ExpBuiltinConstant<float>(
                    AddOrGetString( "PI" ), MathF.PI ) },
                { AddOrGetString( "E" ), new ExpBuiltinConstant<float>(
                    AddOrGetString( "E" ), MathF.E ) },
            };
        }

        public static void DeinitCompile()
        {
            _compileStringCache.Reset();
            _compileStringCache = null;

            _multiplexer.Dispose();
            _multiplexer = null;
        }

        public static bool TryGetBuiltinConst(
                                   string constName,
                                   out ExpElementInstanceBase source )
        {
            return _builtinConst.TryGetValue( constName, out source );
        }

        public static bool TryGetBuiltinType(
                                   string typename,
                                   out ExpTypeSource typeSource )
        {
            return _builtinType.TryGetValue( typename, out typeSource );
        }

        public static class KeyWord
        {

            public const string Int = "INTAGER",
                Real = "REAL",
                Bool = "BOOLEAN",
                String = "STRING",
                Logic = "LOGIC",
                Binary = "BINARY",
                Constant = "CONSTANT";

        }

    }
}