//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="ExpElmentSource"
// 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 System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StgSharp.Script.Express
{
    public interface IExpElementSource : ITypeSource<IExpElementSource>
    {

        public ExpElementType ElementType { get; }

        IScriptSourceProvider SourceProvider { get; }

        string Name { get; }

        public void AddMember(string name, ExpSyntaxNode memberNode);

        public void Analyse();

        public bool TryGetMember(string name, out ExpSyntaxNode memberNode);

    }

    public abstract class ExpInstantiableElement : IExpElementSource
    {

        private List<ExpInstantiableElement> _baseList = new List<ExpInstantiableElement>(),
            _derivationList = new List<ExpInstantiableElement>();

        public abstract ExpElementType ElementType { get; }

        public static ExpInstantiableElement Void
        {
            get => ExpVoidElement.Only;
        }

        public abstract IScriptSourceProvider SourceProvider { get; }

        public abstract string Name { get; }

        public void AddMember(string name, ExpSyntaxNode memberNode)
        {
            throw new NotImplementedException();
        }

        public abstract void Analyse();

        public abstract ExpSyntaxNode CreateInstanceNode(Token t);

        public bool IsConvertable(IExpElementSource targetType)
        {
            if (targetType == null) {
                return false;
            }
            throw new NotImplementedException();
        }

        public static bool IsNullOrVoid(ExpInstantiableElement element)
        {
            return element == null || element == ExpVoidElement.Only;
        }

        public abstract bool TryGetMember(string name, out ExpSyntaxNode memberNode);

        private sealed class ExpVoidElement : ExpInstantiableElement
        {

            private static readonly ExpVoidElement _only = new ExpVoidElement();

            public override ExpElementType ElementType => ExpElementType.Void;

            public static ExpVoidElement Only => _only;

            public override IScriptSourceProvider SourceProvider => ScriptSourceTransmitter.Empty;

            public override string Name => "void";

            public override void Analyse()
            {
                return;
            }

            public override ExpSyntaxNode CreateInstanceNode(Token t)
            {
                return ExpSyntaxNode.Empty;
            }

            public override bool TryGetMember(string name, out ExpSyntaxNode memberNode)
            {
                memberNode = ExpSyntaxNode.Empty;
                return false;
            }

        }

    }

    public abstract class ExpImmutableElement : IExpElementSource
    {

        public abstract ExpElementType ElementType { get; }

        public abstract IScriptSourceProvider SourceProvider { get; }

        public abstract string Name { get; }

        public void AddMember(string name, ExpSyntaxNode memberNode)
        {
            throw new NotImplementedException();
        }

        public abstract void Analyse();

        public bool IsConvertable(IExpElementSource targetType)
        {
            return false;
        }

        public abstract ExpSyntaxNode MakeReference(params object[] options);

        public abstract bool TryGetMember(string name, out ExpSyntaxNode memberNode);

    }
}