// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Xml;
using System.Xml.XPath;

namespace System.Xml.Xsl.XsltOld
{
    internal sealed class MessageAction : ContainerAction
    {
        private bool _Terminate;

        internal override void Compile(Compiler compiler)
        {
            CompileAttributes(compiler);

            if (compiler.Recurse())
            {
                CompileTemplate(compiler);
                compiler.ToParent();
            }
        }

        internal override bool CompileAttribute(Compiler compiler)
        {
            string name = compiler.Input.LocalName;
            string value = compiler.Input.Value;
            if (Ref.Equal(name, compiler.Atoms.Terminate))
            {
                _Terminate = compiler.GetYesNo(value);
            }
            else
            {
                return false;
            }

            return true;
        }

        internal override void Execute(Processor processor, ActionFrame frame)
        {
            Debug.Assert(processor != null && frame != null);
            switch (frame.State)
            {
                case Initialized:
                    TextOnlyOutput output = new TextOnlyOutput(processor, new StringWriter(CultureInfo.InvariantCulture));
                    processor.PushOutput(output);
                    processor.PushActionFrame(frame);
                    frame.State = ProcessingChildren;
                    break;

                case ProcessingChildren:
                    TextOnlyOutput? recOutput = processor.PopOutput() as TextOnlyOutput;
                    Debug.Assert(recOutput != null);

                    if (_Terminate)
                    {
                        throw XsltException.Create(SR.Xslt_Terminate, recOutput.Writer.ToString());
                    }
                    frame.Finished();
                    break;

                default:
                    Debug.Fail("Invalid MessageAction execution state");
                    break;
            }
        }
    }
}