using AxiOmron.PcbCheck.Models;
using AxiOmron.PcbCheck.Options;
using AxiOmron.PcbCheck.Services.Implementations;
using AxiOmron.PcbCheck.Services.Interfaces;
using AxiOmron.PcbCheck.ViewModels;
using Xunit;

namespace AxiOmron.PcbCheck.Tests;

/// <summary>
/// 验证首页视图模型对处理记录和统计区域的绑定行为。
/// </summary>
public sealed class MainWindowViewModelTests
{
    /// <summary>
    /// 构造时应使用运行态快照中的统计值，而不是仅根据最近 100 条列表重新计算。
    /// </summary>
    [Fact]
    public void Constructor_ShouldUseSnapshotStatistics_InsteadOfRecentListCount()
    {
        var stateStore = new AppStateStore();
        stateStore.UpdateSnapshot(snapshot =>
        {
            snapshot.RecordStatisticDate = new DateOnly(2026, 4, 19);
            snapshot.TodayProcessCount = 150;
            snapshot.TodayOkCount = 120;
            snapshot.TodayNgCount = 30;
        });

        var viewModel = CreateViewModel(stateStore);

        Assert.Equal(150, viewModel.TodayProcessCount);
        Assert.Equal(120, viewModel.TodayOkCount);
        Assert.Equal(30, viewModel.TodayNgCount);
        Assert.Equal("2026-04-19", viewModel.RecordStatisticDateText);
    }

    /// <summary>
    /// 构造时应从快照恢复最近 100 条记录，并按完成时间倒序展示。
    /// </summary>
    [Fact]
    public void Constructor_ShouldLoadRecentRecords_FromSnapshot_AndLimitTo100()
    {
        var stateStore = new AppStateStore();
        var records = Enumerable.Range(1, 120)
            .Select(index => new BoardProcessRecord
            {
                StartedAt = new DateTimeOffset(2026, 4, 19, 8, 0, 0, TimeSpan.FromHours(8)).AddMinutes(index).AddSeconds(-10),
                CompletedAt = new DateTimeOffset(2026, 4, 19, 8, 0, 0, TimeSpan.FromHours(8)).AddMinutes(index),
                Barcode = $"PCB-{index:D3}",
                ScanTryCount = 1,
                SftpTryCount = 1,
                ResultCode = index % 2 == 0 ? (ushort)WorkflowResultCode.Passed : (ushort)WorkflowResultCode.NgReleased,
                ResultDescription = index % 2 == 0 ? "OK" : "NG",
                ReleaseSent = true,
                AlarmRaised = false
            })
            .ToList();

        stateStore.ReplaceRecords(
            records,
            new BoardRecordStatistics
            {
                StatisticDate = new DateOnly(2026, 4, 19),
                TotalCount = 120,
                OkCount = 60,
                NgCount = 60
            });

        var viewModel = CreateViewModel(stateStore);

        Assert.Equal(100, viewModel.RecentProcessRecords.Count);
        Assert.Equal("PCB-120", viewModel.RecentProcessRecords[0].Barcode);
        Assert.Equal("PCB-021", viewModel.RecentProcessRecords[^1].Barcode);
    }

    /// <summary>
    /// 当 UI 调度已被取消时，快照事件不应将取消异常继续抛到同步上下文。
    /// </summary>
    [Fact]
    public void SnapshotChanged_ShouldIgnoreCanceledDispatcherTask()
    {
        var stateStore = new AppStateStore();
        var viewModel = CreateViewModel(stateStore, new CanceledDispatcherService());
        var synchronizationContext = new ExceptionCapturingSynchronizationContext();
        SynchronizationContext? originalContext = SynchronizationContext.Current;

        try
        {
            SynchronizationContext.SetSynchronizationContext(synchronizationContext);

            stateStore.UpdateSnapshot(snapshot => snapshot.WorkflowStateText = "运行中");

            Assert.Null(synchronizationContext.CapturedException);
            Assert.Equal("空闲等待", viewModel.WorkflowStateText);
        }
        finally
        {
            SynchronizationContext.SetSynchronizationContext(originalContext);
        }
    }

    /// <summary>
    /// 当 UI 调度已被取消时，日志事件不应将取消异常继续抛到同步上下文。
    /// </summary>
    [Fact]
    public void LogAdded_ShouldIgnoreCanceledDispatcherTask()
    {
        var stateStore = new AppStateStore();
        var viewModel = CreateViewModel(stateStore, new CanceledDispatcherService());
        var synchronizationContext = new ExceptionCapturingSynchronizationContext();
        SynchronizationContext? originalContext = SynchronizationContext.Current;

        try
        {
            SynchronizationContext.SetSynchronizationContext(synchronizationContext);

            stateStore.AddLog(new UiLogEntry
            {
                Timestamp = DateTimeOffset.Now,
                Level = "Information",
                Message = "测试日志"
            });

            Assert.Null(synchronizationContext.CapturedException);
            Assert.Empty(viewModel.Logs);
        }
        finally
        {
            SynchronizationContext.SetSynchronizationContext(originalContext);
        }
    }

    /// <summary>
    /// 创建测试用首页视图模型。
    /// </summary>
    /// <param name="stateStore">运行态存储。</param>
    /// <returns>首页视图模型。</returns>
    private static MainWindowViewModel CreateViewModel(IAppStateStore stateStore, IDispatcherService? dispatcherService = null)
    {
        return new MainWindowViewModel(
            stateStore,
            dispatcherService ?? new ImmediateDispatcherService(),
            new FakeWorkflowControlService(),
            new AppConfig
            {
                Workflow = new WorkflowOptions
                {
                    MaxBoardRecords = 100,
                    MaxUiLogEntries = 200
                },
                Security = new SecurityOptions
                {
                    AdminPassword = "test"
                }
            },
            new FakeAdminUnlockDialogService());
    }

    /// <summary>
    /// 捕获 async void 事件处理器回抛到同步上下文中的异常。
    /// </summary>
    private sealed class ExceptionCapturingSynchronizationContext : SynchronizationContext
    {
        /// <summary>
        /// 获取或设置捕获到的异常。
        /// </summary>
        public Exception? CapturedException { get; private set; }

        /// <summary>
        /// 立即执行回调并记录内部异常，避免测试进程直接崩溃。
        /// </summary>
        /// <param name="d">待执行回调。</param>
        /// <param name="state">回调状态。</param>
        public override void Post(SendOrPostCallback d, object? state)
        {
            ArgumentNullException.ThrowIfNull(d);

            try
            {
                d(state);
            }
            catch (Exception ex)
            {
                CapturedException = ex;
            }
        }
    }

    /// <summary>
    /// 提供立即执行的测试调度服务。
    /// </summary>
    private sealed class ImmediateDispatcherService : IDispatcherService
    {
        public Task InvokeAsync(Action action)
        {
            ArgumentNullException.ThrowIfNull(action);
            action();
            return Task.CompletedTask;
        }
    }

    /// <summary>
    /// 提供始终返回已取消任务的测试调度服务，用于模拟应用关闭阶段的 Dispatcher 中止。
    /// </summary>
    private sealed class CanceledDispatcherService : IDispatcherService
    {
        public Task InvokeAsync(Action action)
        {
            ArgumentNullException.ThrowIfNull(action);
            return Task.FromCanceled(new CancellationToken(canceled: true));
        }
    }

    /// <summary>
    /// 提供空实现的流程控制服务。
    /// </summary>
    private sealed class FakeWorkflowControlService : IWorkflowControlService
    {
        public Task ReconnectPlcAsync(CancellationToken cancellationToken) => Task.CompletedTask;

        public Task ReconnectScannerAsync(CancellationToken cancellationToken) => Task.CompletedTask;

        public Task ResetAsync(CancellationToken cancellationToken) => Task.CompletedTask;

        public Task TestAndonAsync(CancellationToken cancellationToken) => Task.CompletedTask;
    }

    /// <summary>
    /// 提供空实现的管理员解锁弹窗服务。
    /// </summary>
    private sealed class FakeAdminUnlockDialogService : IAdminUnlockDialogService
    {
        public bool ShowUnlockDialog(string expectedPassword, TimeSpan sessionTimeout) => true;
    }
}