#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>
    /// Property 7: 进度报告包含正确的索引和总数
    /// **Validates: Requirements 3.4**
    /// 
    /// For any CNC program with N SavePositionNodes, the CNC_Execution_Service SHALL report
    /// progress N times (or fewer if cancelled), each report containing a 0-based position index
    /// and the total count N, with indices strictly increasing from 0.
    /// </summary>
    public class ProgressReportPropertyTests
    {
        private static (CncExecutionService Service, Mock<IMainViewportService> MainViewport)
            CreateServiceWithImage()
        {
            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 valid image so that image acquisition succeeds
            var dummyImage = CreateDummyBitmap();
            mockMainViewportService.SetupGet(m => m.LatestManualImage).Returns((ImageSource)null);
            mockMainViewportService.SetupGet(m => m.CurrentDisplayImage).Returns(dummyImage);

            // Image persistence 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));

            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, mockMainViewportService);
        }

        private static BitmapSource CreateDummyBitmap()
        {
            var stride = 4 * 4; // 4 pixels wide, 4 bytes per pixel
            var pixels = new byte[stride * 4]; // 4x4 image
            var bitmap = BitmapSource.Create(4, 4, 96, 96, PixelFormats.Bgra32, null, pixels, stride);
            bitmap.Freeze();
            return bitmap;
        }

        /// <summary>
        /// Generates a CncProgram with N SavePositionNodes (N between 1 and 10),
        /// each with unique ascending indices.
        /// </summary>
        private static Arbitrary<CncProgram> SavePositionProgramArb()
        {
            var gen =
                from count in Gen.Choose(1, 10)
                from name in ArbMap.Default.GeneratorFor<NonEmptyString>().Select(s => s.Get)
                from nodes in GenSavePositionNodes(count)
                select new CncProgram(
                    Guid.NewGuid(), name,
                    DateTime.UtcNow, DateTime.UtcNow,
                    nodes.AsReadOnly());
            return gen.ToArbitrary();
        }

        private static Gen<List<CncNode>> GenSavePositionNodes(int count)
        {
            Gen<List<CncNode>> acc = Gen.Constant(new List<CncNode>());
            for (int i = 0; i < count; i++)
            {
                var idx = i;
                acc = from list in acc
                      from nodeName in ArbMap.Default.GeneratorFor<NonEmptyString>().Select(s => s.Get)
                      let node = new SavePositionNode(
                          Guid.NewGuid(), idx, $"Pos_{nodeName}_{idx}",
                          MotionState.Default, SaveImage: false)
                      select new List<CncNode>(list) { node };
            }
            return acc;
        }

        // ── Property 7: 进度报告包含正确的索引和总数 ──────────────────────────

        // Feature: cnc-multi-position-image-capture, Property 7: 进度报告包含正确的索引和总数
        // Validates: Requirements 3.4
        [Property(MaxTest = 100)]
        public Property ProgressReports_ContainCorrectIndexAndTotal()
        {
            return Prop.ForAll(
                SavePositionProgramArb(),
                program =>
                {
                    var (service, _) = CreateServiceWithImage();

                    var savePositionCount = program.Nodes.OfType<SavePositionNode>().Count();

                    // Capture all progress reports that have PositionIndex set (Running state)
                    var runningReports = new List<(int PositionIndex, int TotalPositions)>();
                    var progress = new SynchronousProgress<CncNodeExecutionProgress>(p =>
                    {
                        if (p.State == NodeExecutionState.Running
                            && p.PositionIndex.HasValue
                            && p.TotalPositions.HasValue)
                        {
                            runningReports.Add((p.PositionIndex.Value, p.TotalPositions.Value));
                        }
                    });

                    service.ExecuteAsync(program, progress, CancellationToken.None)
                           .GetAwaiter().GetResult();

                    // Verify: at least N Running progress reports (one per position)
                    if (runningReports.Count < savePositionCount)
                        return false;

                    // Verify: all TotalPositions values equal N
                    if (runningReports.Any(r => r.TotalPositions != savePositionCount))
                        return false;

                    // Verify: PositionIndex values in Running reports are strictly increasing from 0
                    // Extract unique position indices in order of first appearance
                    var seenIndices = new List<int>();
                    foreach (var report in runningReports)
                    {
                        if (seenIndices.Count == 0 || seenIndices.Last() != report.PositionIndex)
                            seenIndices.Add(report.PositionIndex);
                    }

                    // Must have exactly N distinct position indices
                    if (seenIndices.Count != savePositionCount)
                        return false;

                    // Indices must be 0, 1, 2, ..., N-1
                    for (int i = 0; i < savePositionCount; i++)
                    {
                        if (seenIndices[i] != i)
                            return false;
                    }

                    return true;
                });
        }
    }
}