#pragma warning disable xUnit1031 // FsCheck property tests require synchronous execution via GetAwaiter().GetResult()

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using FsCheck;
using FsCheck.Fluent;
using FsCheck.Xunit;
using Moq;
using Prism.Events;
using XP.Common.Logging.Interfaces;
using XplorePlane.Events;
using XplorePlane.Models;
using XplorePlane.Services;
using XplorePlane.Services.AppState;
using XplorePlane.Services.Cnc;
using XplorePlane.Services.InspectionResults;
using XplorePlane.Services.MainViewport;
using Xunit;

namespace XplorePlane.Tests.Services
{
    /// <summary>
    /// FsCheck property-based tests for cancellation summary correctness.
    /// Property 11: 取消时摘要包含正确的完成/未执行计数
    /// **Validates: Requirements 4.5**
    /// </summary>
    public class CancellationSummaryPropertyTests
    {
        // ── Helper: Create a frozen BitmapSource for mocking ──────────────

        private static BitmapSource CreateFrozenBitmap()
        {
            var bitmap = BitmapSource.Create(1, 1, 96, 96, PixelFormats.Bgra32, null, new byte[4], 4);
            bitmap.Freeze();
            return bitmap;
        }

        // ── Helper: Create CncExecutionService with mocks ────────────────

        private static (CncExecutionService Service, Mock<IImagePersistenceService> ImagePersistence)
            CreateServiceWithImagePersistence(BitmapSource sourceImage)
        {
            var mockStore = new Mock<IInspectionResultStore>();
            var mockLogger = new Mock<ILoggerService>();
            var mockMainViewportService = new Mock<IMainViewportService>();
            var mockAppStateService = new Mock<IAppStateService>();
            var mockPipelineExecutionService = new Mock<IPipelineExecutionService>();
            var mockImageProcessingService = new Mock<IImageProcessingService>();
            var mockEventAggregator = new Mock<IEventAggregator>();
            var mockImagePersistenceService = new Mock<IImagePersistenceService>();

            mockLogger.Setup(l => l.ForModule<CncExecutionService>()).Returns(mockLogger.Object);

            mockEventAggregator
                .Setup(ea => ea.GetEvent<DetectorDisconnectedEvent>())
                .Returns(new DetectorDisconnectedEvent());

            mockStore.Setup(s => s.BeginRunAsync(
                    It.IsAny<InspectionRunRecord>(),
                    It.IsAny<InspectionAssetWriteRequest>()))
                .Returns(Task.CompletedTask);

            mockStore.Setup(s => s.AppendNodeResultAsync(
                    It.IsAny<InspectionNodeResult>(),
                    It.IsAny<IEnumerable<InspectionMetricResult>>(),
                    It.IsAny<PipelineExecutionSnapshot>(),
                    It.IsAny<IEnumerable<InspectionAssetWriteRequest>>()))
                .Returns(Task.CompletedTask);

            mockStore.Setup(s => s.CompleteRunAsync(
                    It.IsAny<Guid>(),
                    It.IsAny<bool?>(),
                    It.IsAny<DateTime?>()))
                .Returns(Task.CompletedTask);

            // Provide a source image so positions can succeed
            mockMainViewportService.SetupGet(m => m.LatestManualImage).Returns(sourceImage);
            mockMainViewportService.SetupGet(m => m.CurrentDisplayImage).Returns(sourceImage);

            // SaveImageAsync returns success
            mockImagePersistenceService
                .Setup(s => s.SaveImageAsync(
                    It.IsAny<byte[]>(),
                    It.IsAny<string>(),
                    It.IsAny<string>(),
                    It.IsAny<CancellationToken>()))
                .ReturnsAsync(new ImageSaveResult(true, "C:\\test\\image.bmp", 1024));

            // WriteSummaryAsync returns success
            mockImagePersistenceService
                .Setup(s => s.WriteSummaryAsync(
                    It.IsAny<BatchCaptureResult>(),
                    It.IsAny<string>(),
                    It.IsAny<CancellationToken>()))
                .ReturnsAsync(true);

            var service = new CncExecutionService(
                mockStore.Object,
                mockLogger.Object,
                mockMainViewportService.Object,
                mockAppStateService.Object,
                mockPipelineExecutionService.Object,
                mockImageProcessingService.Object,
                mockEventAggregator.Object,
                mockImagePersistenceService.Object);

            return (service, mockImagePersistenceService);
        }

        // ── Generator: N SavePositionNodes with cancellation point K ─────

        private static Gen<(List<SavePositionNode> Nodes, int CancelAfterK)> SavePositionNodesWithCancelGen =>
            from n in Gen.Choose(2, 10)
            from k in Gen.Choose(0, n - 1)
            from nodes in GenSavePositionNodes(n)
            select (nodes, k);

        private static Gen<List<SavePositionNode>> GenSavePositionNodes(int count)
        {
            Gen<List<SavePositionNode>> acc = Gen.Constant(new List<SavePositionNode>());
            for (int i = 0; i < count; i++)
            {
                var idx = i;
                acc = from list in acc
                      let node = new SavePositionNode(
                          Guid.NewGuid(), idx, $"Position_{idx}",
                          MotionState.Default, SaveImage: true)
                      select new List<SavePositionNode>(list) { node };
            }
            return acc;
        }

        // ── Property 11: 取消时摘要包含正确的完成/未执行计数 ─────────────

        /// <summary>
        /// **Validates: Requirements 4.5**
        ///
        /// For any CNC program execution that is cancelled at position K (0-based)
        /// out of N total positions, the summary SHALL have Status="Cancelled",
        /// CompletedBeforeCancel=K, and NotExecutedAfterCancel=N-K,
        /// where CompletedBeforeCancel + NotExecutedAfterCancel == TotalPositions.
        /// </summary>
        [Property(MaxTest = 100)]
        public Property CancellationSummary_HasCorrectCompletedAndNotExecutedCounts()
        {
            return Prop.ForAll(
                SavePositionNodesWithCancelGen.ToArbitrary(),
                tuple =>
                {
                    var (nodes, cancelAfterK) = tuple;
                    int totalPositions = nodes.Count;

                    var sourceImage = CreateFrozenBitmap();
                    var (service, mockImagePersistence) = CreateServiceWithImagePersistence(sourceImage);

                    // Create a CTS that we will cancel after K positions are processed
                    using var cts = new CancellationTokenSource();
                    int processedCount = 0;

                    // Use progress callback to trigger cancellation after K positions complete
                    var progress = new SynchronousProgress<CncNodeExecutionProgress>(p =>
                    {
                        // Count positions that have completed (Succeeded or Failed state)
                        if (p.State == NodeExecutionState.Succeeded || p.State == NodeExecutionState.Failed)
                        {
                            if (p.PositionIndex.HasValue)
                            {
                                processedCount++;
                                if (processedCount >= cancelAfterK)
                                {
                                    cts.Cancel();
                                }
                            }
                        }
                    });

                    var program = new CncProgram(
                        Guid.NewGuid(), "TestProgram",
                        DateTime.UtcNow, DateTime.UtcNow,
                        nodes.Cast<CncNode>().ToList().AsReadOnly());

                    service.ExecuteAsync(program, progress, cts.Token)
                           .GetAwaiter().GetResult();

                    // Capture the BatchCaptureResult passed to WriteSummaryAsync
                    BatchCaptureResult capturedResult = null;
                    mockImagePersistence.Verify(
                        s => s.WriteSummaryAsync(
                            It.IsAny<BatchCaptureResult>(),
                            It.IsAny<string>(),
                            It.IsAny<CancellationToken>()),
                        Times.Once);

                    // Extract the captured argument
                    var invocation = mockImagePersistence.Invocations
                        .First(i => i.Method.Name == nameof(IImagePersistenceService.WriteSummaryAsync));
                    capturedResult = (BatchCaptureResult)invocation.Arguments[0];

                    // Verify the cancellation summary properties
                    bool statusIsCancelled = capturedResult.Status == "Cancelled";
                    bool completedBeforeCancelIsK = capturedResult.CompletedBeforeCancel == cancelAfterK;
                    bool notExecutedIsCorrect = capturedResult.NotExecutedAfterCancel == totalPositions - cancelAfterK;
                    bool sumEqualsTotal =
                        capturedResult.CompletedBeforeCancel + capturedResult.NotExecutedAfterCancel == totalPositions;
                    bool totalPositionsCorrect = capturedResult.TotalPositions == totalPositions;

                    return statusIsCancelled
                        && completedBeforeCancelIsK
                        && notExecutedIsCorrect
                        && sumEqualsTotal
                        && totalPositionsCorrect;
                });
        }
    }
}