#if UNITY_EDITOR
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using AibisDream.Framework;
using AibisDream.SaveSystem;
using Newtonsoft.Json;
using NUnit.Framework;
using UnityEngine;

namespace AibisDream.DeveloperMode.Editor.Tests
{
    public sealed class TestSaveSystemTests
    {
        private string _root;
        private TestSaveRepository _repository;

        [SetUp]
        public void SetUp()
        {
            _root = Path.Combine(
                Path.GetTempPath(),
                "AibisDream-TestSaveTests",
                Guid.NewGuid().ToString("N"));
            _repository = new TestSaveRepository(_root);
        }

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

        [Test]
        public void Record_SameAnchor_ReplacesSnapshotAndKeepsFirstSeenOrder()
        {
            var first = _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneOne"));
            var second = _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneTwo"));
            var scan = _repository.Scan("1.0");

            Assert.That(scan.Entries.Count, Is.EqualTo(1));
            Assert.That(second.Meta.firstSeenOrder, Is.EqualTo(first.Meta.firstSeenOrder));
            Assert.That(scan.Entries[0].Meta.sceneName, Is.EqualTo("SceneTwo"));
            Assert.That(_repository.TryLoad(scan.Entries[0], out var snapshot, out var error), Is.True, error);
            Assert.That(snapshot.scene.sceneName, Is.EqualTo("SceneTwo"));
        }

        [Test]
        public void Record_ReplacingEarlierEntry_DoesNotMoveItsOrder()
        {
            _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneA"));
            _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeB", "SceneB"));
            _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneA2"));

            var entries = _repository.Scan().Entries.ToArray();
            Assert.That(entries.Select(item => item.NodeName), Is.EqualTo(new[] { "NodeA", "NodeB" }));
            Assert.That(entries[0].Meta.firstSeenOrder, Is.LessThan(entries[1].Meta.firstSeenOrder));
        }

        [Test]
        public void Scan_RetainsMissingSnapshotAsInvalid()
        {
            var entry = _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneA"));
            File.Delete(entry.SnapshotPath);

            var scan = _repository.Scan();

            Assert.That(scan.ValidCount, Is.Zero);
            Assert.That(scan.InvalidCount, Is.EqualTo(1));
            Assert.That(scan.Entries[0].Status, Is.EqualTo(TestSaveEntryStatus.MissingSnapshot));
        }

        [Test]
        public void Scan_RetainsOrphanSnapshotWithBrokenMeta()
        {
            var directory = Path.Combine(_root, "chapter", "broken");
            Directory.CreateDirectory(directory);
            File.WriteAllText(
                Path.Combine(directory, TestSaveRepository.SnapshotFileName),
                "{}",
                Encoding.UTF8);

            var scan = _repository.Scan();

            Assert.That(scan.InvalidCount, Is.EqualTo(1));
            Assert.That(scan.Entries[0].Status, Is.EqualTo(TestSaveEntryStatus.CorruptMeta));
        }

        [Test]
        public void Validate_CorruptSnapshot_IsRetainedAndDisabledOnNextScan()
        {
            var entry = _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneA"));
            File.WriteAllText(entry.SnapshotPath, "{broken", Encoding.UTF8);

            Assert.That(_repository.Validate(entry, out var error), Is.False);
            var rescanned = _repository.Scan();

            Assert.That(error, Does.Contain("无法解析"));
            Assert.That(rescanned.InvalidCount, Is.EqualTo(1));
            Assert.That(rescanned.Entries[0].Status, Is.EqualTo(TestSaveEntryStatus.CorruptSnapshot));
        }

        [Test]
        public void Scan_RecoversCompleteStagingDirectory()
        {
            var final = Path.Combine(_root, "chapter", "node");
            var staging = final + ".__staging";
            Directory.CreateDirectory(staging);
            var request = CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneA");
            var meta = CreateMeta(request, 1);
            File.WriteAllText(
                Path.Combine(staging, TestSaveRepository.MetaFileName),
                JsonConvert.SerializeObject(meta),
                Encoding.UTF8);
            File.WriteAllText(
                Path.Combine(staging, TestSaveRepository.SnapshotFileName),
                SnapshotPersistence.Serialize(request.Snapshot),
                Encoding.UTF8);

            var scan = _repository.Scan();

            Assert.That(Directory.Exists(final), Is.True);
            Assert.That(Directory.Exists(staging), Is.False);
            Assert.That(scan.ValidCount, Is.EqualTo(1));
        }

        [Test]
        public void Record_ConcurrentRequests_ProducesCompleteUniqueEntries()
        {
            var tasks = Enumerable.Range(0, 12)
                .Select(index => Task.Run(() =>
                    _repository.Record(CreateRequest(
                        "ChapterA",
                        "ProjectA",
                        $"Node{index:00}",
                        $"Scene{index:00}"))))
                .ToArray();

            Task.WaitAll(tasks);
            var scan = _repository.Scan();

            Assert.That(scan.ValidCount, Is.EqualTo(12));
            Assert.That(scan.InvalidCount, Is.Zero);
            Assert.That(scan.Entries.Select(item => item.Meta.firstSeenOrder).Distinct().Count(), Is.EqualTo(12));
        }

        [Test]
        public void DeleteInvalid_RemovesOnlyInvalidEntries()
        {
            _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeA", "SceneA"));
            var invalid = _repository.Record(CreateRequest("ChapterA", "ProjectA", "NodeB", "SceneB"));
            File.Delete(invalid.SnapshotPath);

            var removed = _repository.DeleteInvalid(out var error);
            var scan = _repository.Scan();

            Assert.That(error, Is.Null);
            Assert.That(removed, Is.EqualTo(1));
            Assert.That(scan.ValidCount, Is.EqualTo(1));
            Assert.That(scan.InvalidCount, Is.Zero);
        }

        [TestCase(new[] { "hub" }, true)]
        [TestCase(new[] { "linear" }, true)]
        [TestCase(new[] { "content" }, true)]
        [TestCase(new[] { "event" }, false)]
        [TestCase(new[] { "hub", "no_save" }, false)]
        [TestCase(new string[0], true)]
        public void SilentCoverageEvaluator_MatchesSavePointTagSemantics(string[] tags, bool expected)
        {
            var actual = SavePointEvaluator.EvaluateNodeTagsForAutoSaveSilently(
                "Node",
                tags,
                out _);
            Assert.That(actual, Is.EqualTo(expected));
        }

        [TestCase(new[] { "content" }, NodeSaveTiming.NodeEnter, SaveResumeMode.RestartNode)]
        [TestCase(new[] { "interaction" }, NodeSaveTiming.DialogueExit, SaveResumeMode.StateOnly)]
        [TestCase(new[] { "content", "save_on_exit" }, NodeSaveTiming.DialogueExit, SaveResumeMode.StateOnly)]
        [TestCase(new[] { "event", "save_on_exit" }, NodeSaveTiming.DialogueExit, SaveResumeMode.StateOnly)]
        [TestCase(new[] { "interaction", "save_on_exit" }, NodeSaveTiming.DialogueExit, SaveResumeMode.StateOnly)]
        [TestCase(new[] { "interaction", "no_save" }, NodeSaveTiming.None, SaveResumeMode.RestartNode)]
        [TestCase(new[] { "content", "event" }, NodeSaveTiming.None, SaveResumeMode.RestartNode)]
        public void ResolveNodePolicy_MapsNodeTypeAndModifiers(
            string[] tags,
            NodeSaveTiming expectedTiming,
            SaveResumeMode expectedResumeMode)
        {
            var policy = SavePointEvaluator.ResolveNodePolicy(
                "Node",
                tags,
                out _,
                logWarnings: false);

            Assert.That(policy.Timing, Is.EqualTo(expectedTiming));
            Assert.That(policy.ResumeMode, Is.EqualTo(expectedResumeMode));
        }

        [Test]
        public void Repository_StateOnlySnapshot_PreservesAnchorNode()
        {
            var request = CreateRequest("ChapterA", "ProjectA", "InteractionNode", "SceneA");
            request.Snapshot.anchor.startDialogueOnRestore = false;
            request.SaveTrigger = "DialogueExit";
            request.ResumeMode = nameof(SaveResumeMode.StateOnly);
            request.StartDialogueOnRestore = false;
            request.DedupeKey = TestSaveRecorder.BuildDedupeKey(
                request.SceneSoName,
                request.YarnProjectId,
                request.NodeName,
                request.ResumeMode);
            request.EntryId = TestSaveRepository.StableHash(request.DedupeKey);

            var entry = _repository.Record(request);
            var loaded = _repository.TryLoad(entry, out var snapshot, out var error);

            Assert.That(loaded, Is.True, error);
            Assert.That(entry.NodeName, Is.EqualTo("InteractionNode"));
            Assert.That(entry.ResumeMode, Is.EqualTo(nameof(SaveResumeMode.StateOnly)));
            Assert.That(snapshot.anchor.nodeName, Is.EqualTo("InteractionNode"));
            Assert.That(snapshot.anchor.startDialogueOnRestore, Is.False);
        }

        [Test]
        public void SnapshotPersistence_MissingRestoreFlag_IsRejected()
        {
            const string json =
                "{\"schemaVersion\":2,\"anchor\":{\"sceneSoName\":\"ChapterA\"," +
                "\"yarnProjectId\":\"ProjectA\",\"nodeName\":\"NodeA\"}}";

            Assert.Throws<Newtonsoft.Json.JsonSerializationException>(
                () => SnapshotPersistence.Deserialize(json));
        }

        [Test]
        public void SerialTaskQueue_DoesNotDropOrReorderRequests()
        {
            var queue = new SerialTaskQueue();
            var releaseFirst = new TaskCompletionSource<bool>();
            var firstStarted = new TaskCompletionSource<bool>();
            var order = new List<int>();

            var first = queue.Enqueue(async () =>
            {
                order.Add(1);
                firstStarted.SetResult(true);
                await releaseFirst.Task;
                order.Add(2);
            });
            var second = queue.Enqueue(() =>
            {
                order.Add(3);
                return Task.CompletedTask;
            });

            Assert.That(firstStarted.Task.Wait(TimeSpan.FromSeconds(2)), Is.True);
            Assert.That(order, Is.EqualTo(new[] { 1 }));
            Assert.That(queue.PendingCount, Is.EqualTo(2));

            releaseFirst.SetResult(true);
            Assert.That(
                Task.WaitAll(
                    new[] { first.Completion, second.Completion },
                    TimeSpan.FromSeconds(2)),
                Is.True);

            Assert.That(first.Sequence, Is.LessThan(second.Sequence));
            Assert.That(order, Is.EqualTo(new[] { 1, 2, 3 }));
        }

        [Test]
        public void SaveRequest_MapsResumeModeToExplicitAnchorFlag()
        {
            var enter = SaveRequest.NodeEnter("NodeA", "ProjectA", "ChapterA", 3, 7);
            var exit = SaveRequest.DialogueExit("NodeB", "ProjectA", "ChapterA", 3, 9);

            Assert.That(enter.AnchorSpec.NodeName, Is.EqualTo("NodeA"));
            Assert.That(enter.AnchorSpec.StartDialogueOnRestore, Is.True);
            Assert.That(exit.AnchorSpec.NodeName, Is.EqualTo("NodeB"));
            Assert.That(exit.AnchorSpec.StartDialogueOnRestore, Is.False);
        }

        [Test]
        public void InteractionLock_ComposesWithDialogueLock()
        {
            var gameObject = new GameObject("EventSystemEx-Test");
            try
            {
                var eventSystem = gameObject.AddComponent<EventSystemEx>();
                EnumEventSystem.Global.Send(InteractionEventEnum.DialogStart);
                var checkpointLock = eventSystem.AcquireInteractionLock("test");

                EnumEventSystem.Global.Send(InteractionEventEnum.DialogEnd);
                Assert.That(eventSystem.isLocked, Is.True);

                checkpointLock.Dispose();
                Assert.That(eventSystem.isLocked, Is.False);
            }
            finally
            {
                UnityEngine.Object.DestroyImmediate(gameObject);
            }
        }

        private static TestSaveRecordRequest CreateRequest(
            string sceneSoName,
            string yarnProject,
            string nodeName,
            string sceneName)
        {
            var key = TestSaveRecorder.BuildDedupeKey(sceneSoName, yarnProject, nodeName);
            return new TestSaveRecordRequest
            {
                Snapshot = new SaveSnapshot
                {
                    gameVersion = "1.0",
                    savedAt = "2026-01-01 00:00:00",
                    scene = new SceneSnapshotDto { sceneName = sceneName },
                    anchor = new AnchorSnapshot
                    {
                        sceneSoName = sceneSoName,
                        yarnProjectId = yarnProject,
                        nodeName = nodeName,
                        startDialogueOnRestore = true
                    }
                },
                DedupeKey = key,
                EntryId = TestSaveRepository.StableHash(key),
                ChapterId = sceneSoName,
                ChapterTitle = sceneSoName,
                SceneSoName = sceneSoName,
                YarnProjectId = yarnProject,
                NodeName = nodeName,
                SaveTrigger = "NodeEnter",
                ResumeMode = nameof(SaveResumeMode.RestartNode),
                StartDialogueOnRestore = true,
                SceneName = sceneName,
                GameVersion = "1.0"
            };
        }

        private static TestSaveMeta CreateMeta(TestSaveRecordRequest request, long order)
        {
            return new TestSaveMeta
            {
                entryId = request.EntryId,
                dedupeKey = request.DedupeKey,
                chapterId = request.ChapterId,
                chapterTitle = request.ChapterTitle,
                sceneSoName = request.SceneSoName,
                yarnProjectId = request.YarnProjectId,
                nodeName = request.NodeName,
                saveTrigger = request.SaveTrigger,
                resumeMode = request.ResumeMode,
                startDialogueOnRestore = request.StartDialogueOnRestore,
                sceneName = request.SceneName,
                firstSeenOrder = order,
                firstRecordedAt = "2026-01-01 00:00:00",
                lastRecordedAt = "2026-01-01 00:00:00",
                snapshotSchemaVersion = SaveSnapshotSchema.CurrentVersion,
                gameVersion = request.GameVersion
            };
        }
    }
}
#endif