using System;
using System.Diagnostics;
using System.Text;
using Intromat.Model;
using Intromat.Model.Compiler;
using Intromat.Model.Compiler.Error;

namespace Intromat.Nodes.Code
{
    public class VariableReference<T> : ITypedExpression<T>
    {
        public string? PreviewValue => LocalVariable?.VariableName;

        public ITypedVariableDefinition<T>? LocalVariable { get; set; }

        public void Compile(CompilerContext context, StringBuilder sb)
        {
            var localVariable = LocalVariable;
            Debug.Assert(localVariable != null, nameof(localVariable) + " != null");
            Debug.Assert(localVariable.VariableName != null, $"{nameof(localVariable)}.{nameof(localVariable.VariableName)} != null");

            if (!context.IsInScope(localVariable))
                throw new VariableOutOfScopeException(localVariable.VariableName);

            sb.Append(localVariable.VariableName);
        }
        public T Evaluate()
        {
            throw new NotImplementedException();
        }
    }
}