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 * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 *
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 * obtaining a copy of this software and associated documentation
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 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
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 *
 * The above copyright notice and this permission notice shall be
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 * ======================================================================*/

using System;
using System.Collections.ObjectModel;
using NUnit.Framework;
using Opc.Ua.Tests;

namespace Opc.Ua.Server.Tests
{
    [TestFixture]
    [Category("ReverseConnect")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    [Parallelizable]
    public class ReverseConnectServerTests
    {
        private ITelemetryContext m_telemetry;

        [SetUp]
        public void SetUp()
        {
            m_telemetry = NUnitTelemetryContext.Create();
        }

        [Test]
        public void GetReverseConnections_EmptyByDefault()
        {
            using var server = new ReverseConnectServer(m_telemetry);
            ReadOnlyDictionary<Uri, ReverseConnectProperty> connections = server.GetReverseConnections();

            Assert.That(connections, Is.Not.Null);
            Assert.That(connections, Is.Empty);
        }

        [Test]
        public void AddReverseConnection_AddsConnection()
        {
            using var server = new ReverseConnectServer(m_telemetry);
            var url = new Uri("opc.tcp://localhost:4840");

            server.AddReverseConnection(url, timeout: 5000);

            ReadOnlyDictionary<Uri, ReverseConnectProperty> connections = server.GetReverseConnections();
            Assert.That(connections, Has.Count.EqualTo(1));
            Assert.That(connections.ContainsKey(url), Is.True);
        }

        [Test]
        public void AddReverseConnection_DuplicateUrl_ThrowsArgumentException()
        {
            using var server = new ReverseConnectServer(m_telemetry);
            var url = new Uri("opc.tcp://localhost:4840");

            server.AddReverseConnection(url);

            Assert.That(
                () => server.AddReverseConnection(url),
                Throws.TypeOf<ArgumentException>());
        }

        [Test]
        public void AddReverseConnection_MultipleUrls_AllAdded()
        {
            using var server = new ReverseConnectServer(m_telemetry);
            var url1 = new Uri("opc.tcp://host1:4840");
            var url2 = new Uri("opc.tcp://host2:4840");
            var url3 = new Uri("opc.tcp://host3:4840");

            server.AddReverseConnection(url1);
            server.AddReverseConnection(url2);
            server.AddReverseConnection(url3);

            ReadOnlyDictionary<Uri, ReverseConnectProperty> connections = server.GetReverseConnections();
            Assert.That(connections, Has.Count.EqualTo(3));
        }

        [Test]
        public void RemoveReverseConnection_ExistingUrl_ReturnsTrue()
        {
            using var server = new ReverseConnectServer(m_telemetry);
            var url = new Uri("opc.tcp://localhost:4840");
            server.AddReverseConnection(url);

            bool removed = server.RemoveReverseConnection(url);

            Assert.That(removed, Is.True);
            Assert.That(server.GetReverseConnections(), Is.Empty);
        }

        [Test]
        public void RemoveReverseConnection_NonExistingUrl_ReturnsFalse()
        {
            using var server = new ReverseConnectServer(m_telemetry);
            var url = new Uri("opc.tcp://localhost:4840");

            bool removed = server.RemoveReverseConnection(url);

            Assert.That(removed, Is.False);
        }

        [Test]
        public void RemoveReverseConnection_NullUrl_ThrowsArgumentNullException()
        {
            using var server = new ReverseConnectServer(m_telemetry);

            Assert.That(
                () => server.RemoveReverseConnection(null!),
                Throws.TypeOf<ArgumentNullException>());
        }

        [Test]
        public void AddAndRemove_Lifecycle()
        {
            using var server = new ReverseConnectServer(m_telemetry);
            var url1 = new Uri("opc.tcp://host1:4840");
            var url2 = new Uri("opc.tcp://host2:4840");

            server.AddReverseConnection(url1);
            server.AddReverseConnection(url2);
            Assert.That(server.GetReverseConnections(), Has.Count.EqualTo(2));

            server.RemoveReverseConnection(url1);
            ReadOnlyDictionary<Uri, ReverseConnectProperty> remaining = server.GetReverseConnections();
            Assert.That(remaining, Has.Count.EqualTo(1));
            Assert.That(remaining.ContainsKey(url2), Is.True);

            server.RemoveReverseConnection(url2);
            Assert.That(server.GetReverseConnections(), Is.Empty);
        }

        [Test]
        public void DefaultConstants_HaveExpectedValues()
        {
            Assert.That(ReverseConnectServer.DefaultReverseConnectInterval, Is.EqualTo(15000));
            Assert.That(ReverseConnectServer.DefaultReverseConnectTimeout, Is.EqualTo(30000));
            Assert.That(ReverseConnectServer.DefaultReverseConnectRejectTimeout, Is.EqualTo(60000));
        }
    }
}