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

namespace RJ2RoomConSimulator
{
    public partial class MainWindow : Window
    {
        readonly RoomConProtocol _proto = new();
        readonly DispatcherTimer _pollTimer;
        int _rxCount;
        bool _suppressReserve;
        VspWindow? _vspWin;

        static readonly Brush AccentCyan  = Br("#7DCFFF");
        static readonly Brush AccentGreen = Br("#9ECE6A");
        static readonly Brush AccentRed   = Br("#F7768E");
        static readonly Brush AccentYellow = Br("#E0AF68");
        static readonly Brush CardBg      = Br("#313147");
        static readonly Brush TextPrimary = Br("#C0CAF5");
        static readonly Brush TextSecondary = Br("#565F89");
        static readonly Brush LedOff      = Br("#3B3B55");
        static Brush Br(string h) => (Brush)new BrushConverter().ConvertFromString(h)!;

        static void SetChip(System.Windows.Shapes.Ellipse led, bool on, Brush onColor) => led.Fill = on ? onColor : LedOff;

        public MainWindow()
        {
            InitializeComponent();
            _proto.Log += OnLog;
            _proto.ConnectionChanged += OnConnectionChanged;
            _proto.ResponseReceived += OnResponse;

            _pollTimer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(500) };
            _pollTimer.Tick += (_, _) => { if (_proto.IsConnected) _proto.SendNormal(); };

            RefreshPorts();
            UpdateModeButtons();
            UpdateFanButtons();
            Closed += (_, _) => _proto.Dispose();
        }

        // ================= 연결 =================
        void RefreshPorts()
        {
            cmbPort.Items.Clear();
            foreach (var p in _proto.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 (_proto.IsConnected) { _proto.Disconnect(); btnConnect.Content = "연결"; }
            else
            {
                if (cmbPort.SelectedItem == null) { MessageBox.Show("COM 포트를 선택하세요."); return; }
                if (_proto.Connect(cmbPort.SelectedItem.ToString()!)) btnConnect.Content = "연결 해제";
            }
        }

        void Start_Click(object s, RoutedEventArgs e)
        {
            if (!_proto.IsConnected) return;
            _pollTimer.Start();
            btnStart.IsEnabled = false; btnStop.IsEnabled = true;
            OnLog("[폴링 시작] 상태 조회(NORMAL) 주기 송신");
        }
        void Stop_Click(object s, RoutedEventArgs e)
        {
            _pollTimer.Stop();
            btnStart.IsEnabled = _proto.IsConnected; btnStop.IsEnabled = false;
            OnLog("[폴링 중지]");
        }

        // ================= 룸콘 제어 =================
        void Power_Click(object s, RoutedEventArgs e)
        {
            _proto.PowerOn = tglPower.IsChecked == true;
            if (_proto.PowerOn) { _proto.RunMode = 0; _proto.FanMode = 1; }   // ON → 환기 1단
            else _proto.FanMode = 0;                                          // OFF → 풍량 0
            txtPower.Text = _proto.PowerOn ? "ON" : "OFF";
            txtPower.Foreground = _proto.PowerOn ? AccentGreen : TextSecondary;
            UpdateModeButtons(); UpdateFanButtons();
            _proto.SendEvent();
            OnLog($"[제어] 전원 → {(_proto.PowerOn ? "ON (환기 1단)" : "OFF")}");
        }

        void Mode_Click(object s, RoutedEventArgs e)
        {
            if (s is not Button b || b.Tag is not string tag || !byte.TryParse(tag, out var mode)) return;
            _proto.PowerOn = true;
            _proto.RunMode = mode;
            // 운전모드 전환 시 풍량 1단 (자동 제외). 바이패스는 1단 고정, 공청/환기도 전환 기본 1단.
            // (ERV/펌웨어는 룸컨이 보낸 fan을 그대로 따르므로 마스터인 룸컨이 1단을 보내야 동기화됨)
            if (mode != 1) _proto.FanMode = 1;
            // 모드 전환 시 예약 해제
            ClearReserve();
            tglPower.IsChecked = true; txtPower.Text = "ON"; txtPower.Foreground = AccentGreen;
            UpdateModeButtons(); UpdateFanButtons();
            _proto.SendEvent();
            OnLog($"[제어] 모드 → {ModeName(mode)}");
        }

        void Fan_Click(object s, RoutedEventArgs e)
        {
            if (s is not Button b || b.Tag is not string tag || !byte.TryParse(tag, out var sp)) return;
            if (_proto.RunMode == 1) { OnLog("자동모드에서는 풍량 변경 불가"); return; }       // 자동
            if (_proto.RunMode == 2 && sp > 1) { OnLog("바이패스는 1단 고정"); return; }        // 바이패스
            _proto.FanMode = sp;
            _proto.PowerOn = sp > 0 || _proto.PowerOn;
            if (sp > 0) { tglPower.IsChecked = true; txtPower.Text = "ON"; txtPower.Foreground = AccentGreen; }
            UpdateFanButtons();
            _proto.SendEvent();
            OnLog($"[제어] 풍량 → {sp}단");
        }

        void Reserve_Changed(object s, SelectionChangedEventArgs e)
        {
            if (_suppressReserve || !IsLoaded || ReserveCombo.SelectedIndex < 0) return;
            _proto.ReserveHours = ReserveCombo.SelectedIndex;   // 0=해제
            _proto.SendEvent();
            OnLog(_proto.ReserveHours == 0 ? "[제어] 예약 해제" : $"[제어] {_proto.ReserveHours}시간 후 꺼짐 예약");
        }
        void ClearReserve()
        {
            _proto.ReserveHours = 0;
            if (ReserveCombo.SelectedIndex != 0) { _suppressReserve = true; ReserveCombo.SelectedIndex = 0; _suppressReserve = false; }
        }

        void ApplyId_Click(object s, RoutedEventArgs e)
        {
            if (byte.TryParse(txtDeviceId.Text, out var id)) { _proto.DeviceId = id; OnLog($"[설정] ID → {id}"); }
            else OnLog("ID는 0~255 숫자만 가능");
        }

        void OpenVsp_Click(object s, RoutedEventArgs e)
        {
            if (_vspWin == null)
            {
                _vspWin = new VspWindow(_proto) { Owner = this };
                _vspWin.Closed += (_, _) => _vspWin = null;
                _vspWin.Show();
            }
            else _vspWin.Activate();
        }

        // ================= 버튼 강조 =================
        void UpdateModeButtons()
        {
            foreach (var child in ModePanel.Children)
                if (child is Button btn && btn.Tag is string t && byte.TryParse(t, out var m))
                {
                    bool active = _proto.PowerOn && m == _proto.RunMode;
                    btn.Background = active ? AccentCyan : CardBg;
                    btn.Foreground = active ? Brushes.Black : TextPrimary;
                }
        }
        void UpdateFanButtons()
        {
            foreach (var child in FanPanel.Children)
                if (child is Button btn && btn.Tag is string t && byte.TryParse(t, out var sp))
                {
                    bool active = sp == _proto.FanMode;
                    btn.Background = active ? AccentCyan : CardBg;
                    btn.Foreground = active ? Brushes.Black : TextPrimary;
                    // 자동:전 단 비활성 / 바이패스:2~4 비활성
                    btn.IsEnabled = !(_proto.RunMode == 1) && !(_proto.RunMode == 2 && sp > 1);
                }
        }

        // ================= ERV 응답 =================
        void OnResponse(byte cmd)
        {
            Dispatcher.Invoke(() =>
            {
                _rxCount++;
                txtRxCount.Text = $"수신: {_rxCount}";
                txtErvMode.Text = $"{_proto.ErvRunMode} ({ModeName(_proto.ErvRunMode)})";
                txtErvFan.Text  = _proto.ErvFanMode == 0 ? "0 (OFF)" : $"{_proto.ErvFanMode}단";
                txtErvErr.Text  = $"0x{_proto.ErvError:X2}";
                txtErvErr.Foreground = _proto.ErvError != 0 ? AccentRed : TextPrimary;

                // 알람/에러 비트 디코드 (ERV ErrorCode 비트맵)
                byte ec = _proto.ErvError;
                SetChip(AlFClean,  (ec & 0x01) != 0, AccentYellow);   // 필터 청소
                SetChip(AlFChange, (ec & 0x02) != 0, AccentYellow);   // 필터 교환
                SetChip(ErE02, (ec & 0x08) != 0, AccentRed);          // 온도센서
                SetChip(ErE09, (ec & 0x80) != 0, AccentRed);          // 급기팬
                SetChip(ErE10, (ec & 0x20) != 0, AccentRed);          // 배기팬
                SetChip(ErCold,(ec & 0x10) != 0, AccentCyan);         // 장비보호
                SetChip(ErE07, (ec & 0x40) != 0, AccentRed);          // 내부통신
                txtErvIn.Text   = _proto.ErvInTemp  == 100 ? "센서없음" : $"{_proto.ErvInTemp}℃";
                txtErvOut.Text  = _proto.ErvOutTemp == 100 ? "센서없음" : $"{_proto.ErvOutTemp}℃";

                // 후드 연동 표시 (ERV HOOD_INFO 0x0A 수신값) : 후드 ON 오면 연동 ON, ERV OFF면 OFF
                SetChip(HoodLinkLed, _proto.HoodLinked, AccentGreen);
                txtHoodLink.Text = _proto.HoodLinked ? "ON" : "OFF";
                txtHoodLink.Foreground = _proto.HoodLinked ? AccentGreen : TextSecondary;

                // 자동모드: 풍량은 ERV가 자동 결정 → 룸콘 표시를 ERV 보고값으로 동기화
                if (_proto.RunMode == 1 && _proto.FanMode != _proto.ErvFanMode)
                {
                    _proto.FanMode = _proto.ErvFanMode;
                    UpdateFanButtons();
                }
            });
        }

        static string ModeName(int m) => m switch
        {
            0 => "환기", 1 => "자동", 2 => "바이패스", 3 => "공기청정", 4 => "팬테스트", 10 => "OFF", _ => $"?{m}"
        };

        // ================= 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 = $"RoomConSimLog_{DateTime.Now:yyyyMMdd_HHmmss}.txt" };
            if (dlg.ShowDialog() == true)
            {
                try
                {
                    string h = $"========================================\r\n  RJ2-232 룸콘 시뮬레이터 통신 로그\r\n  저장 일시: {DateTime.Now:yyyy-MM-dd HH:mm:ss}\r\n========================================\r\n\r\n";
                    File.WriteAllText(dlg.FileName, h + txtLog.Text);
                    MessageBox.Show($"저장 완료: {dlg.FileName}");
                }
                catch (Exception ex) { MessageBox.Show($"저장 실패: {ex.Message}"); }
            }
        }

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