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using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Moq;
using NUnit.Framework;
using Opc.Ua.Schema;

namespace Opc.Ua.Server.Tests
{
    /// <summary>
    /// Deterministic, offline unit tests for <see cref="DataTypeSchemaRegistrationExtensions"/>.
    /// </summary>
    [TestFixture]
    [Category("DataTypeSchemaRegistration")]
    [Parallelizable(ParallelScope.All)]
    public class DataTypeSchemaRegistrationExtensionsTests
    {
        private static DataTypeState CreateStructureDataType(uint id)
        {
            var definition = new StructureDefinition
            {
                BaseDataType = DataTypeIds.Structure,
                StructureType = StructureType.Structure,
                Fields = new[]
                {
                    new StructureField
                    {
                        Name = "Value",
                        DataType = new NodeId((uint)BuiltInType.Int32),
                        ValueRank = ValueRanks.Scalar,
                        IsOptional = false
                    }
                }
            };

            return new DataTypeState
            {
                NodeId = new NodeId(id, 1),
                BrowseName = new QualifiedName("StructType" + id, 1),
                DataTypeDefinition = new ExtensionObject(definition)
            };
        }

        [Test]
        public void RegisterDataTypeSchemasAsyncWithNullServerThrows()
        {
            var registry = new DataTypeDefinitionRegistry();

            Assert.That(
                async () => await ((IServerInternal)null!)
                    .RegisterDataTypeSchemasAsync(registry)
                    .ConfigureAwait(false),
                Throws.TypeOf<System.ArgumentNullException>());
        }

        [Test]
        public void RegisterDataTypeSchemasAsyncWithNullRegistryThrows()
        {
            var server = new Mock<IServerInternal>();

            Assert.That(
                async () => await server.Object
                    .RegisterDataTypeSchemasAsync(null!)
                    .ConfigureAwait(false),
                Throws.TypeOf<System.ArgumentNullException>());
        }

        [Test]
        public void RegisterDataTypeSchemasWithNullNodesThrows()
        {
            var registry = new DataTypeDefinitionRegistry();

            Assert.That(
                () => ((IEnumerable<NodeState>)null!).RegisterDataTypeSchemas(registry),
                Throws.TypeOf<System.ArgumentNullException>());
        }

        [Test]
        public void RegisterDataTypeSchemasWithNullRegistryThrows()
        {
            var nodes = new List<NodeState>();

            Assert.That(
                () => nodes.RegisterDataTypeSchemas(null!),
                Throws.TypeOf<System.ArgumentNullException>());
        }

        [Test]
        public void TryRegisterDataTypeSchemaWithNullNodeThrows()
        {
            var registry = new DataTypeDefinitionRegistry();

            Assert.That(
                () => ((DataTypeState)null!).TryRegisterDataTypeSchema(registry),
                Throws.TypeOf<System.ArgumentNullException>());
        }

        [Test]
        public void TryRegisterDataTypeSchemaWithNullRegistryThrows()
        {
            DataTypeState node = CreateStructureDataType(4001);

            Assert.That(
                () => node.TryRegisterDataTypeSchema(null!),
                Throws.TypeOf<System.ArgumentNullException>());
        }

        [Test]
        public void TryRegisterDataTypeSchemaRegistersDefinition()
        {
            DataTypeState node = CreateStructureDataType(4002);
            var registry = new DataTypeDefinitionRegistry();

            bool result = node.TryRegisterDataTypeSchema(registry);

            Assert.That(result, Is.True);
        }

        [Test]
        public void TryRegisterDataTypeSchemaWithoutDefinitionReturnsFalse()
        {
            var node = new DataTypeState
            {
                NodeId = new NodeId(4003, 1),
                BrowseName = new QualifiedName("NoDef", 1)
            };
            var registry = new DataTypeDefinitionRegistry();

            bool result = node.TryRegisterDataTypeSchema(registry);

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

        [Test]
        public void RegisterDataTypeSchemasCountsOnlyDataTypeStates()
        {
            var nodes = new List<NodeState>
            {
                CreateStructureDataType(4010),
                CreateStructureDataType(4011),
                new BaseObjectState(null)
            };
            var registry = new DataTypeDefinitionRegistry();

            int count = nodes.RegisterDataTypeSchemas(registry);

            Assert.That(count, Is.EqualTo(2));
        }

        [Test]
        public async Task RegisterDataTypeSchemasAsyncWalksTypeTreeAsync()
        {
            var namespaceUris = new NamespaceTable();
            var typeTree = new TypeTable(namespaceUris);
            DataTypeState dataType = CreateStructureDataType(4020);

            var nodeManager = new Mock<IMasterNodeManager>();
            nodeManager
                .Setup(m => m.FindNodeInAddressSpaceAsync(
                    It.IsAny<NodeId>(), It.IsAny<CancellationToken>()))
                .Returns((NodeId id, CancellationToken ct) =>
                    new ValueTask<NodeState?>(id == DataTypeIds.BaseDataType ? dataType : null));

            var server = new Mock<IServerInternal>();
            server.SetupGet(s => s.NamespaceUris).Returns(namespaceUris);
            server.SetupGet(s => s.TypeTree).Returns(typeTree);
            server.SetupGet(s => s.NodeManager).Returns(nodeManager.Object);

            var registry = new DataTypeDefinitionRegistry();

            int count = await server.Object
                .RegisterDataTypeSchemasAsync(registry)
                .ConfigureAwait(false);

            Assert.That(count, Is.EqualTo(1));
        }
    }
}