//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="ExpConst"
// 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;
using System.Collections.Frozen;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq.Expressions;
using System.Runtime.CompilerServices;
using System.Text;

namespace StgSharp.Script.Express
{
    public sealed class ExpConstantCollectionSource : ExpImmutableElement
    {

        private Dictionary<string, ExpElementInstance> _constants;
        private IScriptSourceProvider _sourceProvider;

        public ExpConstantCollectionSource(IScriptSourceProvider sourceProvider)
        {
            _sourceProvider = sourceProvider;
            _constants = new Dictionary<string, ExpElementInstance>(ExpressCompile.Multiplexer);
        }

        public override ExpElementType ElementType => ExpElementType.Const;

        public override IScriptSourceProvider SourceProvider => _sourceProvider;

        public override string Name
        {
            get => ExpressCompile.Keyword.Constant;
        }

        public override void Analyse()
        {
            throw new NotImplementedException();
        }

        public override ExpSyntaxNode MakeReference(params object[] options)
        {
            if (options.Length == 0 || options[0] is not string str) {
                return null!;
            }
            if (_constants.Count == 0) {
                return null!;
            }
            if (_constants.TryGetValue(str, out ExpElementInstance? token)) {
                return token;
            }
            return null!;
        }

        public bool TryGetConstant(string name, out ExpElementInstance instance)
        {
            return _constants.TryGetValue(name, out instance);
        }

        public override bool TryGetMember(string name, out ExpSyntaxNode memberNode)
        {
            if (_constants.TryGetValue(name, out ExpElementInstance? node))
            {
                memberNode = node;
                return true;
            }
            memberNode = ExpSyntaxNode.Empty;
            return false;
        }

        internal void AddConstant(string name, ExpElementInstance value)
        {
            _constants.Add(name, value);
        }

    }
}