using System;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using Microsoft.Win32;

namespace HoodSimulator
{
    public partial class MainWindow : Window
    {
        readonly HoodProtocol _hood = new();
        int _rxCount;

        // 조리 종료 후 메이크업 유지(잔여 냄새 배출) — 후드측이 담당. 유지중에는 ERV 에 계속 '켜짐' 보고,
        // 종료 시점에 OFF 전송 → ERV 가 원래 모드/풍량으로 복귀. (사양 260613 9p 3.3)
        readonly System.Windows.Threading.DispatcherTimer _makeupTimer =
            new() { Interval = TimeSpan.FromSeconds(1) };
        const int MakeupHoldSec = 10;   // 메이크업 유지 시간 (10초)
        int _makeupRemainSec;

        static readonly Brush AccentCyan  = (Brush)new BrushConverter().ConvertFromString("#7DCFFF")!;
        static readonly Brush AccentGreen = (Brush)new BrushConverter().ConvertFromString("#9ECE6A")!;
        static readonly Brush AccentRed   = (Brush)new BrushConverter().ConvertFromString("#F7768E")!;
        static readonly Brush CardBg      = (Brush)new BrushConverter().ConvertFromString("#313147")!;
        static readonly Brush TextPrimary = (Brush)new BrushConverter().ConvertFromString("#C0CAF5")!;
        static readonly Brush TextSecondary = (Brush)new BrushConverter().ConvertFromString("#565F89")!;

        public MainWindow()
        {
            InitializeComponent();
            _hood.LogMessage += OnLog;
            _hood.ConnectionChanged += OnConnectionChanged;
            _hood.MasterPacketReceived += OnMasterPacket;
            _hood.ResponseSent += OnResponseSent;
            _makeupTimer.Tick += MakeupTick;

            RefreshPorts();
            UpdateFanButtons();
            Closed += (_, _) => { _makeupTimer.Stop(); _hood.Dispose(); };
        }

        // ========== 연결 ==========
        void RefreshPorts()
        {
            cmbPort.Items.Clear();
            foreach (var p in _hood.GetAvailablePorts()) cmbPort.Items.Add(p);
            if (cmbPort.Items.Count > 0) cmbPort.SelectedIndex = 0;
        }
        void RefreshPorts_Click(object s, RoutedEventArgs e) => RefreshPorts();

        void Connect_Click(object s, RoutedEventArgs e)
        {
            if (_hood.IsConnected)
            {
                _hood.Disconnect();
                btnConnect.Content = "연결";
            }
            else
            {
                if (cmbPort.SelectedItem == null) { MessageBox.Show("COM 포트를 선택하세요."); return; }
                if (_hood.Connect(cmbPort.SelectedItem.ToString()!)) btnConnect.Content = "연결 해제";
            }
        }

        void Start_Click(object s, RoutedEventArgs e)
        {
            if (!_hood.IsConnected) return;
            _hood.StartResponding();
            btnStart.IsEnabled = false;
            btnStop.IsEnabled = true;
        }

        void Stop_Click(object s, RoutedEventArgs e)
        {
            _hood.StopResponding();
            btnStart.IsEnabled = true;
            btnStop.IsEnabled = false;
        }

        // ========== 후드 제어 ==========
        void Power_Click(object s, RoutedEventArgs e)
        {
            if (tglPower.IsChecked == true)
            {
                // 켜기 : 진행중인 메이크업 유지 취소 후 즉시 ON (풍량 1)
                StopMakeupHold();
                _hood.PowerOn = true;
                _hood.FanStage = 1;
                txtPower.Text = "ON";
                txtPower.Foreground = AccentGreen;
                UpdateFanButtons();
                OnLog("[제어] 전원 → ON (풍량 1)");
            }
            else
            {
                // 끄기 : OFF 표시 + 옆에 메이크업 유지(1분) 카운트다운 시작. 그동안 ERV엔 계속 '켜짐' 보고.
                //        유지 종료 시 후드 OFF 전송 → ERV 가 원래 모드/풍량으로 복귀.
                txtPower.Text = "OFF";
                txtPower.Foreground = TextSecondary;
                if (_hood.PowerOn && _makeupRemainSec == 0)
                {
                    _makeupRemainSec = MakeupHoldSec;
                    _makeupTimer.Start();
                    txtMakeup.Text = $"메이크업 {_makeupRemainSec}s";
                    OnLog($"[제어] 전원 OFF 요청 → 메이크업 에어 {MakeupHoldSec}s 유지 (ERV엔 계속 켜짐 보고)");
                }
            }
        }

        // 메이크업 유지 카운트다운 (1초). 0이 되면 실제 OFF 전송.
        void MakeupTick(object? s, EventArgs e)
        {
            _makeupRemainSec--;
            if (_makeupRemainSec > 0)
            {
                txtMakeup.Text = $"메이크업 {_makeupRemainSec}s";
            }
            else
            {
                StopMakeupHold();
                _hood.PowerOn = false;
                _hood.FanStage = 0;
                UpdateFanButtons();
                OnLog("[제어] 메이크업 유지 종료 → 후드 OFF 전송 (ERV 원래 모드/풍량 복귀)");
            }
        }

        void StopMakeupHold()
        {
            _makeupTimer.Stop();
            _makeupRemainSec = 0;
            txtMakeup.Text = "";
        }

        void Fan_Click(object s, RoutedEventArgs e)
        {
            if (s is Button b && b.Tag is string tag && byte.TryParse(tag, out var f))
            {
                _hood.FanStage = f;
                UpdateFanButtons();
                OnLog($"[제어] 풍량 → {f}{(f == 0 ? " (꺼짐)" : "단")}");
            }
        }

        void Light_Click(object s, RoutedEventArgs e)
        {
            _hood.Light = tglLight.IsChecked == true;
            txtLight.Text = _hood.Light ? "ON" : "OFF";
            txtLight.Foreground = _hood.Light ? AccentGreen : TextSecondary;
            OnLog($"[제어] 조명 → {(_hood.Light ? "ON" : "OFF")}");
        }

        // 에러코드 토글 (FAN 에러=1 / 기타 에러=2). 둘 다 켜지면 FAN(1) 우선 송신.
        bool _errFan, _errEtc;
        void ErrorCard_Click(object s, System.Windows.Input.MouseButtonEventArgs e)
        {
            if (s is not Border b || b.Tag is not string tag) return;
            if (tag == "1") _errFan = !_errFan;
            else if (tag == "2") _errEtc = !_errEtc;

            _hood.ErrorCode = _errFan ? (byte)1 : _errEtc ? (byte)2 : (byte)0;
            UpdateErrorCards();
            OnLog($"[제어] 에러코드 → {ErrorName(_hood.ErrorCode)} (ERROR={_hood.ErrorCode})");

            // 에러 발생 시 전원 OFF / 풍량 0 / 조명 OFF (다음 응답에 반영되어 전송)
            if (_hood.ErrorCode != 0)
            {
                StopMakeupHold();   // 진행중인 메이크업 유지 즉시 취소
                _hood.PowerOn = false;
                _hood.FanStage = 0;
                _hood.Light = false;

                tglPower.IsChecked = false;
                txtPower.Text = "OFF"; txtPower.Foreground = TextSecondary;
                tglLight.IsChecked = false;
                txtLight.Text = "OFF"; txtLight.Foreground = TextSecondary;
                UpdateFanButtons();
                OnLog("[제어] 에러 발생 → 전원 OFF / 풍량 0 / 조명 OFF");
            }
        }

        void UpdateErrorCards()
        {
            UpdateErrLed(ErrCard_Fan, ErrLed_Fan, _errFan);
            UpdateErrLed(ErrCard_Etc, ErrLed_Etc, _errEtc);
        }

        static void UpdateErrLed(Border card, System.Windows.Shapes.Ellipse led, bool on)
        {
            led.Fill = on ? AccentRed : (Brush)new BrushConverter().ConvertFromString("#3B3B55")!;
            card.BorderBrush = on ? AccentRed : (Brush)new BrushConverter().ConvertFromString("#3B3B55")!;
            card.BorderThickness = new Thickness(on ? 2 : 1);
        }

        static string ErrorName(byte e) => e switch { 1 => "FAN 에러", 2 => "기타 에러", _ => "정상" };

        void UpdateFanButtons()
        {
            foreach (var child in FanPanel.Children)
            {
                if (child is Button btn && btn.Tag is string tag && byte.TryParse(tag, out var f))
                {
                    bool active = f == _hood.FanStage;
                    btn.Background = active ? AccentCyan : CardBg;
                    btn.Foreground = active ? Brushes.Black : TextPrimary;
                }
            }
        }

        // ========== 마스터 패킷 수신 ==========
        void OnMasterPacket(byte mode, byte fan, byte en, byte run)
        {
            Dispatcher.Invoke(() =>
            {
                _rxCount++;
                txtRxCount.Text = $"수신: {_rxCount}";
                txtRxMode.Text = $"{mode} ({ModeName(mode)})";
                txtRxFan.Text  = fan == 0 ? "0 (OFF)" : $"{fan}단";
                txtRxEn.Text   = en != 0 ? "Enable" : "Disable";
                txtRxRun.Text  = run != 0 ? "운전중" : "정지";
            });
        }

        // ========== 응답 송신 ==========
        void OnResponseSent(byte[] tx)
        {
            Dispatcher.Invoke(() =>
            {
                txtTxFan.Text   = tx[3] == 0 ? "0 (OFF)" : $"{tx[3]}단";
                txtTxLight.Text = tx[4] != 0 ? "ON" : "OFF";
                txtTxCmd.Text   = tx[6] != 0 ? "1 (켜짐)" : "0 (꺼짐)";
                txtTxError.Text = $"{tx[7]} ({ErrorName(tx[7])})";
            });
        }

        static string ModeName(byte m) => m switch
        {
            0 => "OFF", 1 => "환기", 2 => "자동", 3 => "공청", 4 => "바이패스", 5 => "기타", _ => "?"
        };

        // ========== 로그 ==========
        void OnLog(string msg)
        {
            Dispatcher.Invoke(() =>
            {
                txtLog.AppendText(msg + Environment.NewLine);
                if (txtLog.LineCount > 500)
                {
                    var lines = txtLog.Text.Split(Environment.NewLine);
                    txtLog.Text = string.Join(Environment.NewLine, lines[^300..]);
                }
                txtLog.ScrollToEnd();
            });
        }

        void ClearLog_Click(object s, RoutedEventArgs e) => txtLog.Clear();

        void SaveLog_Click(object s, RoutedEventArgs e)
        {
            var dlg = new SaveFileDialog
            {
                Filter = "텍스트 파일 (*.txt)|*.txt",
                FileName = $"HoodSimLog_{DateTime.Now:yyyyMMdd_HHmmss}.txt"
            };
            if (dlg.ShowDialog() == true)
            {
                try
                {
                    string h = $"========================================\r\n  후드 시뮬레이터 통신 로그\r\n  저장 일시: {DateTime.Now:yyyy-MM-dd HH:mm:ss}\r\n========================================\r\n\r\n";
                    File.WriteAllText(dlg.FileName, h + txtLog.Text);
                    MessageBox.Show($"저장 완료: {dlg.FileName}");
                }
                catch (Exception ex) { MessageBox.Show($"저장 실패: {ex.Message}"); }
            }
        }

        void OnConnectionChanged(bool connected)
        {
            Dispatcher.Invoke(() =>
            {
                if (connected)
                {
                    statusLed.Fill = AccentGreen;
                    txtStatus.Text = "연결됨";
                    btnStart.IsEnabled = true;
                    btnConnect.Content = "연결 해제";
                }
                else
                {
                    statusLed.Fill = AccentRed;
                    txtStatus.Text = "미연결";
                    btnStart.IsEnabled = false;
                    btnStop.IsEnabled = false;
                    btnConnect.Content = "연결";
                }
            });
        }
    }
}