#nullable enable
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using NUnit.Framework;
using ShrinkNetwork;

namespace ShrinkNetwork.Editor.Tests
{
    public sealed class ShrinkNetworkSemanticScannerTests
    {
        [Test]
        public void NamespaceCollisionIsRejectedInsteadOfSilentlyDroppingAContract()
        {
            var exception = Assert.Throws<InvalidOperationException>(() =>
                ShrinkNetworkSemanticScanner.ScanTypesForTests(
                    typeof(CollisionA.SharedMessage),
                    typeof(CollisionB.SharedMessage)));

            StringAssert.Contains("SharedMessage", exception!.Message);
            StringAssert.Contains(typeof(CollisionA.SharedMessage).FullName, exception.Message);
            StringAssert.Contains(typeof(CollisionB.SharedMessage).FullName, exception.Message);
        }

        [Test]
        public void PartialMessageUsesTheCompiledTypeAndIncludesEveryPart()
        {
            var result = ShrinkNetworkSemanticScanner.ScanTypesForTests(typeof(PartialMessage));

            CollectionAssert.AreEqual(
                new[] { "First", "Second" },
                result.Messages.Single().Properties.Select(property => property.Name));
        }

        [Test]
        public void ComplexGenericPropertyKeepsItsSemanticTypeShape()
        {
            var result = ShrinkNetworkSemanticScanner.ScanTypesForTests(
                typeof(ComplexGenericMessage),
                typeof(SemanticPayload));

            var property = result.Messages.Single().Properties.Single();
            Assert.AreEqual("Dictionary<string, List<SemanticPayload[]>>", property.Type);
            Assert.AreEqual("Payloads", property.Name);
            Assert.AreEqual("SemanticPayload", result.DataTypes.Single().Name);
        }
    }

    public sealed class ShrinkDedicatedServerTemplateProtectionTests
    {
        private string _root = string.Empty;
        private string _templateRoot = string.Empty;
        private string _outputRoot = string.Empty;

        [SetUp]
        public void SetUp()
        {
            _root = Path.Combine(Path.GetTempPath(), "ShrinkNetworkGeneratorTests", Guid.NewGuid().ToString("N"));
            _templateRoot = Path.Combine(_root, "Template");
            _outputRoot = Path.Combine(_root, "Output");
            Directory.CreateDirectory(_templateRoot);
        }

        [TearDown]
        public void TearDown()
        {
            if (Directory.Exists(_root))
                Directory.Delete(_root, true);
        }

        [Test]
        public void ModifiedManagedFileBlocksRegenerationBeforeAnyFileIsWritten()
        {
            File.WriteAllText(Path.Combine(_templateRoot, "README.md.txt"), "generated-v1");
            File.WriteAllText(Path.Combine(_templateRoot, "settings.json.txt"), "settings-v1");
            ShrinkDedicatedServerScaffoldGenerator.CopyTemplateProject(_templateRoot, _outputRoot);

            File.WriteAllText(Path.Combine(_outputRoot, "README.md"), "manual-change");
            File.WriteAllText(Path.Combine(_templateRoot, "settings.json.txt"), "settings-v2");

            Assert.Throws<InvalidOperationException>(() =>
                ShrinkDedicatedServerScaffoldGenerator.CopyTemplateProject(_templateRoot, _outputRoot));
            Assert.AreEqual("manual-change", File.ReadAllText(Path.Combine(_outputRoot, "README.md")));
            Assert.AreEqual("settings-v1", File.ReadAllText(Path.Combine(_outputRoot, "settings.json")));
        }

        [Test]
        public void UnmodifiedManagedFilesCanBeRegeneratedFromANewerTemplate()
        {
            File.WriteAllText(Path.Combine(_templateRoot, "README.md.txt"), "generated-v1");
            ShrinkDedicatedServerScaffoldGenerator.CopyTemplateProject(_templateRoot, _outputRoot);
            File.WriteAllText(Path.Combine(_templateRoot, "README.md.txt"), "generated-v2");

            ShrinkDedicatedServerScaffoldGenerator.CopyTemplateProject(_templateRoot, _outputRoot);

            Assert.AreEqual("generated-v2", File.ReadAllText(Path.Combine(_outputRoot, "README.md")));
        }
    }

    [ShrinkNetworkMessage(9101, "tests/partial")]
    internal sealed partial class PartialMessage : IShrinkNetworkMessage
    {
        public int First { get; set; }
    }

    internal sealed partial class PartialMessage
    {
        public string Second { get; set; } = string.Empty;
    }

    [ShrinkNetworkMessage(9102, "tests/complex-generic")]
    internal sealed class ComplexGenericMessage : IShrinkNetworkMessage
    {
        public Dictionary<string, List<SemanticPayload[]>> Payloads { get; set; } = new();
    }

    internal sealed class SemanticPayload
    {
        public Guid Id { get; set; }
    }
}

namespace ShrinkNetwork.Editor.Tests.CollisionA
{
    [ShrinkNetworkMessage(9110, "tests/collision-a")]
    internal sealed class SharedMessage : IShrinkNetworkMessage
    {
    }
}

namespace ShrinkNetwork.Editor.Tests.CollisionB
{
    [ShrinkNetworkMessage(9111, "tests/collision-b")]
    internal sealed class SharedMessage : IShrinkNetworkMessage
    {
    }
}