//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="StepEntityInstanceNode.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.Model.Step;
using StgSharp.Script;
using StgSharp.Script.Express;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace StgSharp.Model.Step
{
    public class StepEntityInstanceNode : ExpSyntaxNode
    {

        private StepEntityInstanceNode( Token source ) : base( source ) { }

        public override ExpSyntaxNode Left => Empty;

        public override ExpSyntaxNode Right => Empty;

        public override IExpElementSource EqualityTypeConvert => StepEntityType.Source;

        public int Id { get; init; }

        public static StepEntityInstanceNode Register( Token t )
        {
            if( t.Value[ 0 ] != '#' ) {
                throw new ExpInvalidSyntaxException( "Entity label in STEP should be # + number" );
            }
            StepEntityInstanceNode node = new StepEntityInstanceNode( t )
            {
                Id = int.Parse( t.Value.AsSpan( 1 ) ),
            };
            return node;
        }

        public static StepEntityInstanceNode RegisterNull( Token t )
        {
            if( t.Value != "$" ) {
                throw new ExpInvalidSyntaxException(
                    $"Token {t.Value} does not represent a null entity" );
            }
            StepEntityInstanceNode node = new StepEntityInstanceNode( t )
            {
                Id = 0,
            };
            return node;
        }

        public static StepEntityInstanceNode RegisterRuntimeInference( Token t )
        {
            if( t.Value != "*" ) {
                throw new ExpInvalidSyntaxException(
                    $"Token {t.Value} does not represent a runtime inferences entity" );
            }
            StepEntityInstanceNode node = new StepEntityInstanceNode( t )
            {
                Id = -1,
            };
            return node;
        }

    }

    internal class StepEntityType : ExpTypeSource
    {

        private StepEntityType( string typeName ) : base( typeName ) { }

        public static StepEntityType Source { get; } = new StepEntityType( "ENTITY" );

    }
}