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using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Tango.Scripting
{
    public class ScriptEngine
    {
        private CancellationTokenSource _cancaller;
        private OnExecuteParameters _onExecuteParameters;
        public List<Type> ReferencedAssemblies { get; private set; }

        public ScriptEngine(OnExecuteParameters parameters)
        {
            _onExecuteParameters = parameters;
            ReferencedAssemblies = new List<Type>();
        }

        public async Task Run(String code)
        {
            //My References.
            var options = ScriptOptions.Default;

            //External References.
            //foreach (var r in item.References)
            //{
            //    options = options.AddReferences(r.FilePath);
            //}

            //My Assemblies.
            options = options.AddReferences(typeof(Form).Assembly.Location);
            options = options.AddReferences(typeof(Enumerable).Assembly.Location);
            options = options.AddReferences(typeof(ScriptEngine).Assembly.Location);

            foreach (var asm in ReferencedAssemblies)
            {
                options = options.AddReferences(asm.Assembly.Location);
            }

            //Imports.
            options = options.AddImports(
            "System",
            "System.Collections.Generic",
            "System.Linq",
            "System.Text",
            "System.Diagnostics",
            "System.Windows.Forms"
            );

            String methodParameters = String.Join(", ", _onExecuteParameters.GetType().GetFields(BindingFlags.Public | BindingFlags.Instance).Select(x => x.Name));

            _cancaller = new CancellationTokenSource();
            await CSharpScript.RunAsync(
               code +
               Environment.NewLine +
               Environment.NewLine +
               "await Task.Factory.StartNew(() => { OnExecute(" + methodParameters + "); });", options: options, globals: _onExecuteParameters, cancellationToken: _cancaller.Token);
        }

        public void Stop()
        {
            _cancaller.Cancel();
        }
    }
}