//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="ExpCompile"
// 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;
using System.Collections.Frozen;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Text;

namespace StgSharp.Script.Express
{
    public static partial class ExpressCompile
    {

        private static string[] _operatorsWithLetter;
        private static ConcurrentStringHashMultiplexer _multiplexer;
        private static FrozenDictionary<string, ExpElementInstance> _builtinConst;
        private static FrozenDictionary<string, ExpTypeSource> _builtinType;
        private static FrozenDictionary<string, ExpBinaryOperatorNode> _operators;
        private static StringPool _compileStringCache,_emptyCache;

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

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

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

            _multiplexer.Dispose();
            _multiplexer = null!;
        }

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

            ExpSchema_Builtin.Only.Init();

            PoolKeywords();
            InitPrecedence();

            _operatorsWithLetter = [ Keyword.Add, Keyword.Sub, Keyword.Mul, Keyword.Div, Keyword.And, Keyword.Or, Keyword.Xor, Keyword.AndOr, Keyword.Not, ];

            ExpSchema_Builtin.Only
                             .TryGetType(
                                 PoolString(Keyword.Integer), out ExpTypeSource? _expInt);
            ExpInt = _expInt;

            ExpSchema_Builtin.Only.TryGetType(PoolString(Keyword.Real), out ExpTypeSource? _expReal);
            ExpReal = _expReal;
            ExpSchema_Builtin.Only
                             .TryGetType(
                                 PoolString(Keyword.Boolean), out ExpTypeSource? _expBool);
            ExpBool = _expBool;

            ExpSchema_Builtin.Only
                             .TryGetType(
                                 PoolString(Keyword.Boolean), out ExpTypeSource? _expString);
            ExpString = _expString;


            _emptyCache = new StringPool();
            /*
            foreach( string str in _compileStringCache ) {
                _emptyCache.Add( str );
            }
            /**/
        }

        public static bool LetterIsKeyword(string str)
        {
            if (char.IsLetter(str[0])) {
                return _keywordSet.Contains(str);
            }
            return true;
        }

        public static bool LetterIsOperator(string str)
        {
            if (char.IsLetter(str[0])) {
                return Array.IndexOf(_operatorsWithLetter, str) != -1;
            }
            return true;
        }

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

        public static string PoolString(ReadOnlySpan<char> str)
        {
            return _compileStringCache.GetOrAdd(str);
        }

    }
}