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 * OPC Foundation MIT License 1.00
 *
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 * obtaining a copy of this software and associated documentation
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using NUnit.Framework;
using Opc.Ua.Server.FileSystem;

namespace Opc.Ua.Server.Tests.FileSystem
{
    /// <summary>
    /// Round-trip and parse tests for <see cref="FileSystemNodeId"/>.
    /// </summary>
    [TestFixture]
    [Category("FileSystem")]
    [Parallelizable]
    public class FileSystemNodeIdRoundTripTests
    {
        [Test]
        public void BuildRootRoundTrips()
        {
            NodeId nodeId = FileSystemNodeId.BuildRoot(3);

            Assert.That(FileSystemNodeId.TryParse(nodeId, out FileSystemNodeId parsed), Is.True);
            Assert.That(parsed.RootType, Is.EqualTo(FileSystemNodeId.Root));
            Assert.That(parsed.ProviderPath, Is.Empty);
            Assert.That(parsed.NamespaceIndex, Is.EqualTo(3));
            Assert.That(parsed.ComponentPath, Is.Null);
        }

        [Test]
        public void BuildDirectoryRoundTrips()
        {
            NodeId nodeId = FileSystemNodeId.BuildDirectory("folder/sub", 2);

            Assert.That(FileSystemNodeId.TryParse(nodeId, out FileSystemNodeId parsed), Is.True);
            Assert.That(parsed.RootType, Is.EqualTo(FileSystemNodeId.Directory));
            Assert.That(parsed.ProviderPath, Is.EqualTo("folder/sub"));
        }

        [Test]
        public void BuildFileRoundTrips()
        {
            NodeId nodeId = FileSystemNodeId.BuildFile("folder/file.txt", 5);

            Assert.That(FileSystemNodeId.TryParse(nodeId, out FileSystemNodeId parsed), Is.True);
            Assert.That(parsed.RootType, Is.EqualTo(FileSystemNodeId.File));
            Assert.That(parsed.ProviderPath, Is.EqualTo("folder/file.txt"));
            Assert.That(parsed.NamespaceIndex, Is.EqualTo(5));
        }

        [Test]
        public void ProviderPathWithSpecialCharactersIsEscapedAndRoundTrips()
        {
            NodeId nodeId = FileSystemNodeId.BuildFile("a&b?c/d", 1);

            Assert.That(FileSystemNodeId.TryParse(nodeId, out FileSystemNodeId parsed), Is.True);
            Assert.That(parsed.ProviderPath, Is.EqualTo("a&b?c/d"));
            Assert.That(parsed.ComponentPath, Is.Null);
        }

        [Test]
        public void ToNodeIdWithComponentNameAppendsQuestionMark()
        {
            var id = new FileSystemNodeId(FileSystemNodeId.File, "file.txt", 1);

            var nodeId = id.ToNodeId("Open");

            Assert.That(FileSystemNodeId.TryParse(nodeId, out FileSystemNodeId parsed), Is.True);
            Assert.That(parsed.ProviderPath, Is.EqualTo("file.txt"));
            Assert.That(parsed.ComponentPath, Is.EqualTo("Open"));
        }

        [Test]
        public void ToNodeIdWithExistingComponentPathAppendsSlash()
        {
            var id = new FileSystemNodeId(FileSystemNodeId.File, "file.txt", 1, "Open");

            var nodeId = id.ToNodeId("InputArguments");

            Assert.That(FileSystemNodeId.TryParse(nodeId, out FileSystemNodeId parsed), Is.True);
            Assert.That(parsed.ComponentPath, Is.EqualTo("Open/InputArguments"));
        }

        [Test]
        public void TryParseReturnsFalseForNullNodeId()
        {
            Assert.That(FileSystemNodeId.TryParse(NodeId.Null, out _), Is.False);
        }

        [Test]
        public void TryParseReturnsFalseForNumericNodeId()
        {
            Assert.That(FileSystemNodeId.TryParse(new NodeId(42u, 1), out _), Is.False);
        }

        [Test]
        public void TryParseReturnsFalseWhenColonMissing()
        {
            Assert.That(FileSystemNodeId.TryParse(new NodeId("123", 1), out _), Is.False);
        }

        [Test]
        public void TryParseReturnsFalseWhenSeparatorIsNotColon()
        {
            Assert.That(FileSystemNodeId.TryParse(new NodeId("12x", 1), out _), Is.False);
        }

        [Test]
        public void TryParseTreatsLeadingColonAsRootTypeZero()
        {
            Assert.That(FileSystemNodeId.TryParse(new NodeId(":path", 1), out FileSystemNodeId parsed), Is.True);
            Assert.That(parsed.RootType, Is.Zero);
            Assert.That(parsed.ProviderPath, Is.EqualTo("path"));
        }

        [Test]
        public void ConstructorNormalizesNullProviderPathToEmpty()
        {
            var id = new FileSystemNodeId(FileSystemNodeId.Root, null!, 0);

            Assert.That(id.ProviderPath, Is.Empty);
        }
    }
}