using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Windows.Forms;
using DevExpress.XtraEditors;
using DevExpress.XtraEditors.Controls;

namespace KepGridEditor
{
    public partial class FormTrend : XtraForm
    {
        public event EventHandler<TrendChangedEventArgs> TrendDataChanged;

        private BindingList<TrendSource> _trends = new BindingList<TrendSource>();
        private bool _isInternalUpdating = false;

        public List<TrendSource> TrendParams => _trends.ToList();
        public int FusionMode => cbMode.SelectedIndex;

        private int _nameCounter = 1; // 初始为1

        public FormTrend()
        {
            InitializeComponent();
            SetupUIConfig();
            InitData();
            BindEvents();

            gaugeKnob.Paint += GaugeKnob_Paint;
            gaugeKnob.MouseDown += GaugeKnob_MouseDown;
            gaugeKnob.MouseMove += GaugeKnob_MouseMove;

            // 鼠标松开时，通知主界面最终结果
            gaugeKnob.MouseUp += (s, e) => NotifyDataChanged(TrendOperateType.Update);
        }

        protected override void OnShown(EventArgs e)
        {
            base.OnShown(e);

            // 窗体完全显示后，手动触发一次 Update 通知
            if (_trends.Count > 0)
            {
                NotifyDataChanged(TrendOperateType.Update);
            }
        }

        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            base.OnFormClosing(e);
            NotifyDataChanged(TrendOperateType.Close);
        }

        private void SetupUIConfig()
        {
            cbAlgo.Properties.TextEditStyle = TextEditStyles.DisableTextEditor;
            cbMode.Properties.TextEditStyle = TextEditStyles.DisableTextEditor;
            cbAlgo.Properties.Items.Add("最小曲率法 (Thin Plate Spline)");
            cbAlgo.SelectedIndex = 0;
            cbMode.Properties.Items.AddRange(new[] { "加权融合", "极值融合" });
            cbMode.SelectedIndex = 0;

            arcScale.MinValue = 0;
            arcScale.MaxValue = 360;
            arcScale.StartAngle = -90;
            arcScale.EndAngle = 270;
            arcScale.MajorTickCount = 13;
            arcScale.AppearanceTickmarkText.TextBrush = new DevExpress.XtraGauges.Core.Drawing.SolidBrushObject(Color.Black);
        }

        private void InitData()
        {
            listTrends.DataSource = _trends;
            listTrends.DisplayMember = "DisplayText";
            _trends.Add(new TrendSource { Name = $"趋势 {_nameCounter++}", Angle = 45, Ratio = 2.0 });
            listTrends.SelectedIndex = 0;
        }

        private void BindEvents()
        {
            btnAdd.Click += (s, e) => {
                var selected = listTrends.SelectedItem as TrendSource;

                // 使用 _nameCounter++ 确保每次生成的数字都是唯一的，即使中间有删除
                var newItem = new TrendSource
                {
                    Name = $"趋势 {_nameCounter++}",
                    Angle = 0,
                    Ratio = 1.0,
                    Cx = selected?.Cx ?? 0,
                    Cy = selected?.Cy ?? 0
                };

                _trends.Add(newItem);
                listTrends.SelectedIndex = _trends.Count - 1;
                NotifyDataChanged(TrendOperateType.Update);
            };

            btnDel.Click += (s, e) =>
            {
                if (_trends.Count > 1)
                {
                    var cur = listTrends.SelectedItem as TrendSource;
                    string nameToDelete = cur.Name; // 记录要删除的名字

                    _trends.RemoveAt(listTrends.SelectedIndex);
                    gaugeKnob.Invalidate();
                    NotifyDataChanged(TrendOperateType.Delete, nameToDelete); // 通知项删除
                }
            };

            cbMode.SelectedIndexChanged += (s, e) => NotifyDataChanged(TrendOperateType.Update);

            listTrends.SelectedIndexChanged += (s, e) => SyncUIFromModel();

            trackRatio.ValueChanged += (s, e) =>
            {
                if (_isInternalUpdating || listTrends.SelectedItem == null) return;
                var cur = listTrends.SelectedItem as TrendSource;
                cur.Ratio = trackRatio.Value / 10.0;
                lblRatioNum.Text = cur.Ratio.ToString("F1");
                listTrends.Refresh();
            };

            // 滑块松开时通知
            trackRatio.MouseUp += (s, e) => NotifyDataChanged(TrendOperateType.Update);
        }

        private void GaugeKnob_Paint(object sender, PaintEventArgs e)
        {
            if (listTrends.SelectedItem is TrendSource cur)
            {
                e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
                Point center = new Point(gaugeKnob.Width / 2, gaugeKnob.Height / 2);
                double angleRad = (cur.Angle - 90) * Math.PI / 180.0;
                int radius = (Math.Min(gaugeKnob.Width, gaugeKnob.Height) / 2) - 20;
                Point endPoint = new Point((int)(center.X + radius * Math.Cos(angleRad)), (int)(center.Y + radius * Math.Sin(angleRad)));
                using (Pen p = new Pen(Color.Blue, 6)) { p.EndCap = LineCap.ArrowAnchor; e.Graphics.DrawLine(p, center, endPoint); }
                e.Graphics.FillEllipse(Brushes.DarkGray, center.X - 8, center.Y - 8, 16, 16);
            }
        }

        private void GaugeKnob_MouseDown(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) UpdateAngle(e.Location); }
        private void GaugeKnob_MouseMove(object sender, MouseEventArgs e) { if (e.Button == MouseButtons.Left) UpdateAngle(e.Location); }

        private void UpdateAngle(Point pos)
        {
            if (listTrends.SelectedItem == null) return;
            Point center = new Point(gaugeKnob.Width / 2, gaugeKnob.Height / 2);
            double angleRad = Math.Atan2(pos.Y - center.Y, pos.X - center.X);
            double angleDeg = angleRad * (180 / Math.PI) + 90;
            if (angleDeg < 0) angleDeg += 360;

            var cur = listTrends.SelectedItem as TrendSource;
            cur.Angle = Math.Round(angleDeg);
            lblAngleValue.Text = $"{cur.Angle}°";
            listTrends.Refresh();
            gaugeKnob.Invalidate();
        }

        private void SyncUIFromModel()
        {
            if (listTrends.SelectedItem is TrendSource cur)
            {
                _isInternalUpdating = true;
                lblAngleValue.Text = $"{cur.Angle}°";
                trackRatio.Value = (int)(cur.Ratio * 10);
                lblRatioNum.Text = cur.Ratio.ToString("F1");
                _isInternalUpdating = false;
                gaugeKnob.Invalidate();
            }
        }

        private void NotifyDataChanged(TrendOperateType type, string deletedName = "")
        {
            if (TrendDataChanged != null)
            {
                TrendDataChanged.Invoke(this, new TrendChangedEventArgs
                {
                    ActiveTrend = listTrends.SelectedItem as TrendSource,
                    AllTrends = _trends.ToList(),
                    Mode = cbMode.SelectedIndex,
                    OperateType = type,         // 告知主界面是更新、删除还是关闭
                    DeletedName = deletedName
                });
            }
        }

        private void updatePositionBtn_CheckedChanged(object sender, EventArgs e)
        {
            if (updatePositionBtn.Checked)
            {
                NotifyDataChanged(TrendOperateType.PickLocation);
            }
        }

        public void ReleasePickButton()
        {
            if (updatePositionBtn.InvokeRequired)
            {
                updatePositionBtn.Invoke(new Action(() => updatePositionBtn.Checked = false));
            }
            else
            {
                updatePositionBtn.Checked = false;
            }

            NotifyDataChanged(TrendOperateType.Update);
        }
    }
    public enum TrendOperateType
    {
        Update, // 更新（旋钮、滑块、添加）
        Delete, // 删除
        Close,   // 界面关闭
        PickLocation // 主界面进入拾取坐标模式
    }

    public class TrendChangedEventArgs : EventArgs
    {
        public TrendSource ActiveTrend { get; set; } // 当前被修改的项
        public List<TrendSource> AllTrends { get; set; } // 全量列表
        public int Mode { get; set; } // 融合模式

        public TrendOperateType OperateType { get; set; } // 操作类型
        public string DeletedName { get; set; } // 被删除项的名称，方便OSG清理
    }

    public class TrendSource

    {

        public string Name { get; set; }

        public double Angle { get; set; }

        public double Ratio { get; set; }

        public double Weight { get; set; } = 1.0;
        public int Cx { get; set; } = 0;

        public int Cy { get; set; } = 0;

        public string DisplayText => $"{Name} : {Angle,3}° | 强度: {Ratio:F1} | w: {Weight:F2}";

    }
}