using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using ErvDashboard.Model;

namespace ErvDashboard
{
    // 스마트수면 시간설정 팝업 (원형 다이얼). 시작/종료 시각을 설정 → 적용 시 메인이 종료 시각에 자동 해제 예약.
    // 대시보드 전용(ERV 프로토콜 무관). 시각은 자정 기준 분(0~1439, 30분 단위).
    public partial class SmartSleepWindow : Window
    {
        readonly MainWindow _owner;
        readonly DashboardState _state;

        const double CX = 130, CY = 130, R = 104;   // DialCanvas(260x260) 중심/반지름

        int _startMin, _endMin;
        bool _dragStart, _dragEnd, _updating;

        public SmartSleepWindow(MainWindow owner, DashboardState state)
        {
            InitializeComponent();
            _owner = owner;
            _state = state;
            _startMin = state.SleepStartMin;
            _endMin = state.SleepEndMin;

            for (int m = 0; m < 1440; m += 30)
            {
                StartCombo.Items.Add(new ComboBoxItem { Content = DashboardState.FmtTime(m), Tag = m });
                EndCombo.Items.Add(new ComboBoxItem { Content = DashboardState.FmtTime(m), Tag = m });
            }
            StartCombo.SelectionChanged += StartCombo_Changed;
            EndCombo.SelectionChanged += EndCombo_Changed;

            UpdateDial();
        }

        // ===== 다이얼/콤보 갱신 =====
        void UpdateDial()
        {
            _updating = true;
            SleepArc.Data = BuildArc(_startMin, _endMin);
            PositionHandle(StartHandle, _startMin);
            PositionHandle(EndHandle, _endMin);
            StartRun.Text = DashboardState.FmtTime(_startMin);
            EndRun.Text = DashboardState.FmtTime(_endMin);
            StartCombo.SelectedIndex = _startMin / 30;
            EndCombo.SelectedIndex = _endMin / 30;
            _updating = false;
        }

        Geometry BuildArc(int s, int e)
        {
            Point p0 = Polar(s / 1440.0 * 360.0);
            Point p1 = Polar(e / 1440.0 * 360.0);
            double sweep = ((e - s + 1440) % 1440) / 1440.0 * 360.0;
            var fig = new System.Windows.Media.PathFigure { StartPoint = p0, IsClosed = false };
            fig.Segments.Add(new ArcSegment(p1, new Size(R, R), 0, sweep > 180.0, SweepDirection.Clockwise, true));
            var g = new PathGeometry();
            g.Figures.Add(fig);
            return g;
        }

        static Point Polar(double angleDeg)   // 0°=위, 시계방향
        {
            double t = angleDeg * Math.PI / 180.0;
            return new Point(CX + R * Math.Sin(t), CY - R * Math.Cos(t));
        }

        static void PositionHandle(FrameworkElement h, int min)
        {
            Point p = Polar(min / 1440.0 * 360.0);
            Canvas.SetLeft(h, p.X - h.Width / 2);
            Canvas.SetTop(h, p.Y - h.Height / 2);
        }

        static int AngleToMin(Point p)
        {
            double ang = Math.Atan2(p.X - CX, -(p.Y - CY)) * 180.0 / Math.PI;   // 0=위, 시계방향
            if (ang < 0) ang += 360;
            int min = (int)Math.Round(ang / 360.0 * 1440.0 / 30.0) * 30;
            return ((min % 1440) + 1440) % 1440;
        }

        // ===== 드래그 =====
        void StartHandle_Down(object sender, MouseButtonEventArgs e) { _dragStart = true; StartHandle.CaptureMouse(); e.Handled = true; }
        void EndHandle_Down(object sender, MouseButtonEventArgs e) { _dragEnd = true; EndHandle.CaptureMouse(); e.Handled = true; }

        void Handle_Move(object sender, MouseEventArgs e)
        {
            if (!_dragStart && !_dragEnd) return;
            int min = AngleToMin(e.GetPosition(DialCanvas));
            if (_dragStart) _startMin = min; else _endMin = min;
            UpdateDial();
        }

        void Handle_Up(object sender, MouseButtonEventArgs e)
        {
            _dragStart = _dragEnd = false;
            (sender as UIElement)?.ReleaseMouseCapture();
        }

        // ===== 콤보 =====
        void StartCombo_Changed(object sender, SelectionChangedEventArgs e)
        {
            if (_updating || StartCombo.SelectedItem is not ComboBoxItem it) return;
            _startMin = (int)it.Tag;
            UpdateDial();
        }

        void EndCombo_Changed(object sender, SelectionChangedEventArgs e)
        {
            if (_updating || EndCombo.SelectedItem is not ComboBoxItem it) return;
            _endMin = (int)it.Tag;
            UpdateDial();
        }

        // ===== 버튼 =====
        void Apply_Click(object sender, RoutedEventArgs e)
        {
            _state.SleepStartMin = _startMin;
            _state.SleepEndMin = _endMin;
            _owner.ApplySmartSleep();
            Close();
        }

        void Close_Click(object sender, RoutedEventArgs e) => Close();
    }
}