using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Text;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Sln.Wcs.UI.Services;

namespace Sln.Wcs.UI.ViewModels;

public partial class SystemMonitorViewModel : ObservableObject
{
    private readonly IEngineProcessService _hoistEngine;
    private readonly IAgvEngineProcessService _agvEngine;

    [ObservableProperty]
    private ObservableCollection<LogEntry> _logs = new();

    [ObservableProperty]
    private int _logCount;

    [ObservableProperty]
    private bool _autoScroll = true;

    // ---- Hoist ----
    [ObservableProperty] private bool _isHoistRunning;
    [ObservableProperty] private string _hoistStatusText = "已停止";
    public string HoistStatusColor => IsHoistRunning ? "#00E676" : "#FF5252";

    // ---- AGV ----
    [ObservableProperty] private bool _isAgvRunning;
    [ObservableProperty] private string _agvStatusText = "已停止";
    public string AgvStatusColor => IsAgvRunning ? "#00E676" : "#FF5252";

    private const int MaxLogs = 5000;

    public SystemMonitorViewModel(IEngineProcessService hoistEngine, IAgvEngineProcessService agvEngine)
    {
        _hoistEngine = hoistEngine;
        _agvEngine = agvEngine;

        _hoistEngine.StateChanged += () => RefreshHoist();
        _hoistEngine.OutputReceived += msg => AddLog($"[提升机] {msg}");
        _agvEngine.StateChanged += () => RefreshAgv();
        _agvEngine.OutputReceived += msg => AddLog($"[AGV] {msg}");

        StartHoistCommand = new AsyncRelayCommand(StartHoistAsync, () => !IsHoistRunning);
        StopHoistCommand = new RelayCommand(StopHoist, () => IsHoistRunning);
        StartAgvCommand = new AsyncRelayCommand(StartAgvAsync, () => !IsAgvRunning);
        StopAgvCommand = new RelayCommand(StopAgv, () => IsAgvRunning);

        var original = Console.Out;
        var writer = new LogTextWriter(original, entry =>
        {
            Avalonia.Threading.Dispatcher.UIThread.Post(() =>
            {
                Logs.Add(entry);
                if (Logs.Count > MaxLogs) Logs.RemoveAt(0);
                LogCount = Logs.Count;
            });
        });
        Console.SetOut(writer);
    }

    private void RefreshHoist()
    {
        Avalonia.Threading.Dispatcher.UIThread.Post(() =>
        {
            IsHoistRunning = _hoistEngine.IsRunning;
            HoistStatusText = _hoistEngine.StatusText;
            OnPropertyChanged(nameof(HoistStatusColor));
            StartHoistCommand.NotifyCanExecuteChanged();
            StopHoistCommand.NotifyCanExecuteChanged();
        });
    }

    private void RefreshAgv()
    {
        Avalonia.Threading.Dispatcher.UIThread.Post(() =>
        {
            IsAgvRunning = _agvEngine.IsRunning;
            AgvStatusText = _agvEngine.StatusText;
            OnPropertyChanged(nameof(AgvStatusColor));
            StartAgvCommand.NotifyCanExecuteChanged();
            StopAgvCommand.NotifyCanExecuteChanged();
        });
    }

    // ---- Hoist Commands ----
    public IAsyncRelayCommand StartHoistCommand { get; }
    public IRelayCommand StopHoistCommand { get; }

    private async System.Threading.Tasks.Task StartHoistAsync()
    {
        try { AddLog("正在启动 HoistServer..."); await _hoistEngine.StartAsync(); AddLog("HoistServer 启动成功"); }
        catch (Exception ex) { AddLog($"Hoist 启动失败: {ex.Message}", "ERROR"); if (_hoistEngine.LastError != null) AddLog(_hoistEngine.LastError, "ERROR"); }
    }
    private void StopHoist() { _hoistEngine.Stop(); AddLog("HoistServer 已停止"); }

    // ---- AGV Commands ----
    public IAsyncRelayCommand StartAgvCommand { get; }
    public IRelayCommand StopAgvCommand { get; }

    private async System.Threading.Tasks.Task StartAgvAsync()
    {
        try { AddLog("正在启动 HikRoBotServer..."); await _agvEngine.StartAsync(); AddLog("HikRoBotServer 启动成功"); }
        catch (Exception ex) { AddLog($"AGV 启动失败: {ex.Message}", "ERROR"); if (_agvEngine.LastError != null) AddLog(_agvEngine.LastError, "ERROR"); }
    }
    private void StopAgv() { _agvEngine.Stop(); AddLog("HikRoBotServer 已停止"); }

    private void AddLog(string msg, string level = "INFO")
    {
        Logs.Add(new LogEntry { Time = DateTime.Now, Message = msg, Level = level });
        if (Logs.Count > MaxLogs) Logs.RemoveAt(0);
        LogCount = Logs.Count;
    }

    [RelayCommand] private void Clear() { Logs.Clear(); LogCount = 0; }
    [RelayCommand] private void ToggleAutoScroll() { AutoScroll = !AutoScroll; }
}

public class LogEntry
{
    public DateTime Time { get; set; }
    public string TimeText => Time.ToString("HH:mm:ss.fff");
    public string Message { get; set; } = string.Empty;
    public string Level { get; set; } = "INFO";
}

internal class LogTextWriter : TextWriter
{
    private readonly TextWriter _original;
    private readonly Action<LogEntry> _onWrite;
    private readonly StringBuilder _buffer = new();
    public LogTextWriter(TextWriter o, Action<LogEntry> cb) { _original = o; _onWrite = cb; }
    public override Encoding Encoding => Encoding.UTF8;
    public override void Write(char v) { _original.Write(v); if (v == '\n') Flush(); else if (v != '\r') _buffer.Append(v); }
    public override void WriteLine(string? m) { _original.WriteLine(m); if (m != null) _onWrite(new LogEntry { Time = DateTime.Now, Message = m, Level = "INFO" }); }
    private void Flush() { var m = _buffer.ToString(); _buffer.Clear(); if (m.Length > 0) _onWrite(new LogEntry { Time = DateTime.Now, Message = m, Level = "INFO" }); }
}