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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 System;
using System.Threading.Tasks;
using NUnit.Framework;
using Opc.Ua.Client.FileSystem;

namespace Opc.Ua.Client.Tests.FileSystem
{
    /// <summary>
    /// End-to-end mock-based tests for <see cref="UaFileInfo.RefreshAsync"/>
    /// (the seven well-known FileType properties).
    /// </summary>
    [TestFixture]
    [Category("FileSystem")]
    [Parallelizable]
    public class FileSystemClientMetadataTests
    {
        [Test]
        public async Task RefreshAsyncPopulatesMandatoryPropertiesAsync()
        {
            var harness = FileSystemSessionHarness.Create();
            var props = new FileProperties
            {
                Size = 12_345UL,
                Writable = true,
                UserWritable = false,
                OpenCount = 3
            };
            props.Realize();
            harness.RegisterFile(harness.Root, new QualifiedName("data.bin"), properties: props);
            var client = new FileSystemClient(harness.Session, harness.Root);

            UaFileInfo file = await client.GetFileAsync("/data.bin").ConfigureAwait(false);
            await file.RefreshAsync().ConfigureAwait(false);

            Assert.That(file.Size, Is.EqualTo(12_345UL));
            Assert.That(file.Writable, Is.True);
            Assert.That(file.UserWritable, Is.False);
            Assert.That(file.OpenCount, Is.EqualTo(3));
            Assert.That(file.MimeType, Is.Null);
            Assert.That(file.MaxByteStringLength, Is.Null);
            Assert.That(file.LastModifiedTime, Is.Null);
        }

        [Test]
        public async Task RefreshAsyncPopulatesOptionalPropertiesAsync()
        {
            var harness = FileSystemSessionHarness.Create();
            var expectedModified = new DateTime(2024, 5, 12, 13, 0, 0, DateTimeKind.Utc);
            var props = new FileProperties
            {
                Size = 0UL,
                Writable = true,
                UserWritable = true,
                OpenCount = 0,
                MimeType = "application/json",
                MaxByteStringLength = 64_000u,
                LastModifiedTime = expectedModified
            };
            props.Realize();
            harness.RegisterFile(harness.Root, new QualifiedName("data.json"), properties: props);
            var client = new FileSystemClient(harness.Session, harness.Root);

            UaFileInfo file = await client.GetFileAsync("/data.json").ConfigureAwait(false);
            await file.RefreshAsync().ConfigureAwait(false);

            Assert.That(file.MimeType, Is.EqualTo("application/json"));
            Assert.That(file.MaxByteStringLength, Is.EqualTo(64_000u));
            Assert.That(file.LastModifiedTime, Is.EqualTo(expectedModified));
        }

        [Test]
        public async Task RefreshAsyncToleratesMissingOptionalPropertiesAsync()
        {
            var harness = FileSystemSessionHarness.Create();
            // No properties realised — the harness will return BadNoMatch
            // for every property lookup.
            harness.RegisterFile(harness.Root, new QualifiedName("data.bin"),
                properties: new FileProperties());
            var client = new FileSystemClient(harness.Session, harness.Root);

            UaFileInfo file = await client.GetFileAsync("/data.bin").ConfigureAwait(false);
            await file.RefreshAsync().ConfigureAwait(false);

            // Defaults for non-resolved mandatory properties.
            Assert.That(file.Size, Is.Zero);
            Assert.That(file.Writable, Is.False);
            Assert.That(file.UserWritable, Is.False);
            Assert.That(file.OpenCount, Is.Zero);
            // Optional properties remain null.
            Assert.That(file.MimeType, Is.Null);
            Assert.That(file.MaxByteStringLength, Is.Null);
            Assert.That(file.LastModifiedTime, Is.Null);
        }
    }
}