using System;
using System.Collections.ObjectModel;
using System.Threading;
using System.Windows;

namespace TeamAAS.FlowEngine.Execution
{
    /// <summary>
    /// 运行统计中心。FlowRunner 每次产品运行结束后调用 AddRun 更新计数；
    /// 首页 / 统计页直接绑定 Instance 的属性即可获得真实数据（不再写死假数据）。
    /// </summary>
    public class RunStatistics : TeamAAS.BindableBase
    {
        public static RunStatistics Instance { get; } = new RunStatistics();

        private long _totalCount;
        private long _okCount;
        private long _ngCount;
        private long _cycleMs;

        private RunStatistics()
        {
            Logs = new ObservableCollection<RunLogEntry>();
        }

        /// <summary>运行日志（首页"运行信息"面板直接绑定）</summary>
        public ObservableCollection<RunLogEntry> Logs { get; }

        public long TotalCount => Interlocked.Read(ref _totalCount);
        public long OkCount => Interlocked.Read(ref _okCount);
        public long NgCount => Interlocked.Read(ref _ngCount);
        public long CycleTimeMs => Interlocked.Read(ref _cycleMs);

        public string YieldText =>
            TotalCount == 0 ? "--" : (OkCount * 100.0 / TotalCount).ToString("F1") + "%";

        public string UphText =>
            CycleTimeMs > 0 ? Math.Round(3600000.0 / CycleTimeMs).ToString("F0") : "--";

        public string CtText =>
            CycleTimeMs > 0 ? (CycleTimeMs / 1000.0).ToString("F2") + "s" : "--";

        /// <summary>记录一次运行结果（后台线程安全，UI 属性自动跨线程刷新）</summary>
        public void AddRun(bool success, long cycleMs)
        {
            Interlocked.Increment(ref _totalCount);
            if (success) Interlocked.Increment(ref _okCount);
            else Interlocked.Increment(ref _ngCount);
            Interlocked.Exchange(ref _cycleMs, cycleMs);

            RaiseCountersChanged();
            Log((success ? "OK" : "NG") + $"  周期 {cycleMs}ms");
        }

        public void Reset()
        {
            Interlocked.Exchange(ref _totalCount, 0);
            Interlocked.Exchange(ref _okCount, 0);
            Interlocked.Exchange(ref _ngCount, 0);
            Interlocked.Exchange(ref _cycleMs, 0);

            OnUi(() => Logs.Clear());
            RaiseCountersChanged();
            Log("统计已清零");
        }

        /// <summary>写一条运行日志（最多保留 200 条）</summary>
        public void Log(string message)
        {
            // 并入统一日志流：经 AppLogger 进入公共日志文件 + 实时日志控件
            TeamAAS.AppLogger.Info(message, "运行");

            OnUi(() =>
            {
                Logs.Add(new RunLogEntry(DateTime.Now, message ?? ""));
                while (Logs.Count > 200)
                    Logs.RemoveAt(0);
            });
        }

        private void RaiseCountersChanged()
        {
            RaisePropertyChanged(nameof(TotalCount));
            RaisePropertyChanged(nameof(OkCount));
            RaisePropertyChanged(nameof(NgCount));
            RaisePropertyChanged(nameof(CycleTimeMs));
            RaisePropertyChanged(nameof(YieldText));
            RaisePropertyChanged(nameof(UphText));
            RaisePropertyChanged(nameof(CtText));
        }

        private static void OnUi(Action action)
        {
            if (Application.Current?.Dispatcher != null
                && !Application.Current.Dispatcher.CheckAccess())
                Application.Current.Dispatcher.Invoke(action);
            else
                action();
        }
    }

    /// <summary>运行日志条目</summary>
    public class RunLogEntry
    {
        public RunLogEntry(DateTime time, string message)
        {
            Time = time;
            Message = message;
        }

        public DateTime Time { get; }
        public string Message { get; }

        public string TimeText => Time.ToString("HH:mm:ss");
    }
}