using Moq;
using System;
using System.Linq;
using System.Windows.Threading;
using Xunit;
using XP.Common.Logging.Interfaces;
using XplorePlane.Models;
using XplorePlane.Services.AppState;
using XplorePlane.ViewModels.Debug;

namespace XplorePlane.Tests.ViewModels
{
    /// <summary>
    /// EventLogViewModel 单元测试
    /// Unit tests for EventLogViewModel
    /// </summary>
    public class EventLogViewModelTests
    {
        private readonly Mock<IAppStateService> _mockAppStateService;
        private readonly Mock<ILoggerService> _mockLoggerService;
        private readonly Dispatcher _dispatcher;

        public EventLogViewModelTests()
        {
            _mockAppStateService = new Mock<IAppStateService>();
            _mockLoggerService = new Mock<ILoggerService>();
            
            // 创建 Dispatcher（需要在 STA 线程上）
            // Create Dispatcher (needs to be on STA thread)
            _dispatcher = Dispatcher.CurrentDispatcher;

            // 设置 logger mock 返回自身（链式调用）
            // Setup logger mock to return itself (method chaining)
            _mockLoggerService.Setup(l => l.ForModule<EventLogViewModel>())
                .Returns(_mockLoggerService.Object);
        }

        [Fact]
        public void Constructor_InitializesFilterOptionsWithAllStatesEnabled()
        {
            // Arrange & Act
            var viewModel = new EventLogViewModel(
                _mockAppStateService.Object,
                _mockLoggerService.Object,
                _dispatcher);

            // Assert
            Assert.Equal(8, viewModel.FilterOptions.Count);
            Assert.True(viewModel.FilterOptions["MotionState"]);
            Assert.True(viewModel.FilterOptions["RaySourceState"]);
            Assert.True(viewModel.FilterOptions["DetectorState"]);
            Assert.True(viewModel.FilterOptions["SystemState"]);
            Assert.True(viewModel.FilterOptions["CameraState"]);
            Assert.True(viewModel.FilterOptions["LinkedViewState"]);
            Assert.True(viewModel.FilterOptions["RecipeExecutionState"]);
            Assert.True(viewModel.FilterOptions["CalibrationMatrix"]);
        }

        [Fact]
        public void ToggleFilterCommand_TogglesFilterState()
        {
            // Arrange
            var viewModel = new EventLogViewModel(
                _mockAppStateService.Object,
                _mockLoggerService.Object,
                _dispatcher);

            var initialState = viewModel.FilterOptions["MotionState"];

            // Act
            viewModel.ToggleFilterCommand.Execute("MotionState");

            // Assert
            Assert.Equal(!initialState, viewModel.FilterOptions["MotionState"]);
        }

        [Fact]
        public void SelectAllFiltersCommand_EnablesAllFilters()
        {
            // Arrange
            var viewModel = new EventLogViewModel(
                _mockAppStateService.Object,
                _mockLoggerService.Object,
                _dispatcher);

            // 先禁用所有过滤器
            // First disable all filters
            viewModel.ClearAllFiltersCommand.Execute();

            // Act
            viewModel.SelectAllFiltersCommand.Execute();

            // Assert
            Assert.All(viewModel.FilterOptions.Values, value => Assert.True(value));
        }

        [Fact]
        public void ClearAllFiltersCommand_DisablesAllFilters()
        {
            // Arrange
            var viewModel = new EventLogViewModel(
                _mockAppStateService.Object,
                _mockLoggerService.Object,
                _dispatcher);

            // Act
            viewModel.ClearAllFiltersCommand.Execute();

            // Assert
            Assert.All(viewModel.FilterOptions.Values, value => Assert.False(value));
        }

        [Fact]
        public void ApplyFilter_FiltersEventLogCorrectly()
        {
            // Arrange
            var viewModel = new EventLogViewModel(
                _mockAppStateService.Object,
                _mockLoggerService.Object,
                _dispatcher);

            // 添加测试数据
            // Add test data
            viewModel.EventLog.Add(new EventLogEntry
            {
                Timestamp = DateTime.Now,
                EventType = "MotionStateChanged",
                FieldName = "StageX",
                OldValue = "0",
                NewValue = "100",
                Category = "MotionState"
            });

            viewModel.EventLog.Add(new EventLogEntry
            {
                Timestamp = DateTime.Now,
                EventType = "RaySourceStateChanged",
                FieldName = "IsOn",
                OldValue = "False",
                NewValue = "True",
                Category = "RaySourceState"
            });

            // 禁用 RaySourceState 过滤器
            // Disable RaySourceState filter
            viewModel.FilterOptions["RaySourceState"] = false;

            // Act
            viewModel.ToggleFilterCommand.Execute("MotionState"); // 触发过滤器应用
            viewModel.ToggleFilterCommand.Execute("MotionState"); // 恢复状态

            // Assert
            Assert.Single(viewModel.FilteredEventLog);
            Assert.Equal("MotionState", viewModel.FilteredEventLog[0].Category);
        }

        [Fact]
        public void EventLog_LimitsTo1000Records()
        {
            // Arrange
            var viewModel = new EventLogViewModel(
                _mockAppStateService.Object,
                _mockLoggerService.Object,
                _dispatcher);

            // Act - 添加 1001 条记录
            // Act - Add 1001 records
            for (int i = 0; i < 1001; i++)
            {
                viewModel.EventLog.Add(new EventLogEntry
                {
                    Timestamp = DateTime.Now,
                    EventType = "MotionStateChanged",
                    FieldName = "StageX",
                    OldValue = i.ToString(),
                    NewValue = (i + 1).ToString(),
                    Category = "MotionState"
                });
            }

            // Assert
            Assert.Equal(1000, viewModel.EventLog.Count);
        }

        [Fact]
        public void Dispose_ClearsCollections()
        {
            // Arrange
            var viewModel = new EventLogViewModel(
                _mockAppStateService.Object,
                _mockLoggerService.Object,
                _dispatcher);

            viewModel.EventLog.Add(new EventLogEntry
            {
                Timestamp = DateTime.Now,
                EventType = "MotionStateChanged",
                FieldName = "StageX",
                OldValue = "0",
                NewValue = "100",
                Category = "MotionState"
            });

            // Act
            viewModel.Dispose();

            // Assert
            Assert.Empty(viewModel.EventLog);
            Assert.Empty(viewModel.FilteredEventLog);
        }
    }
}