using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfApp.src.components
{
    /// <summary>
    /// SensorChart.xaml 的交互逻辑
    /// </summary>
    public partial class SensorChart : UserControl, INotifyPropertyChanged
    {
        public SensorChart()
        {
            InitializeComponent();
            DataContext = this;
            
            // 设置默认值
            SensorName = "传感器";
            HeaderBackground = new SolidColorBrush(Color.FromRgb(230, 243, 255)); // #E6F3FF
            Value = 0;
            RedLineValues = new List<double>();
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        #region 依赖属性

        // 传感器名称
        public static readonly DependencyProperty SensorNameProperty =
            DependencyProperty.Register("SensorName", typeof(string), typeof(SensorChart),
                new PropertyMetadata("传感器", OnSensorNameChanged));

        public string SensorName
        {
            get { return (string)GetValue(SensorNameProperty); }
            set { SetValue(SensorNameProperty, value); }
        }

        private static void OnSensorNameChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as SensorChart;
            control?.OnPropertyChanged(nameof(SensorName));
        }

        // 标题背景色
        public static readonly DependencyProperty HeaderBackgroundProperty =
            DependencyProperty.Register("HeaderBackground", typeof(Brush), typeof(SensorChart),
                new PropertyMetadata(new SolidColorBrush(Color.FromRgb(230, 243, 255)), OnHeaderBackgroundChanged));

        public Brush HeaderBackground
        {
            get { return (Brush)GetValue(HeaderBackgroundProperty); }
            set { SetValue(HeaderBackgroundProperty, value); }
        }

        private static void OnHeaderBackgroundChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as SensorChart;
            control?.OnPropertyChanged(nameof(HeaderBackground));
        }

        // 数值
        public static readonly DependencyProperty ValueProperty =
            DependencyProperty.Register("Value", typeof(double), typeof(SensorChart),
                new PropertyMetadata(0.0, OnValueChanged));

        public double Value
        {
            get { return (double)GetValue(ValueProperty); }
            set { SetValue(ValueProperty, value); }
        }

        private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as SensorChart;
            control?.UpdateBarPosition();
        }

        // 红线数值列表
        public static readonly DependencyProperty RedLineValuesProperty =
            DependencyProperty.Register("RedLineValues", typeof(List<double>), typeof(SensorChart),
                new PropertyMetadata(new List<double>(), OnRedLineValuesChanged));

        public List<double> RedLineValues
        {
            get { return (List<double>)GetValue(RedLineValuesProperty); }
            set { SetValue(RedLineValuesProperty, value); }
        }

        private static void OnRedLineValuesChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as SensorChart;
            control?.UpdateRedLinePositions();
        }

        #endregion

        #region 计算属性

        private double _barTop;
        public double BarTop
        {
            get { return _barTop; }
            private set
            {
                _barTop = value;
                OnPropertyChanged(nameof(BarTop));
            }
        }

        private double _barHeight;
        public double BarHeight
        {
            get { return _barHeight; }
            private set
            {
                _barHeight = value;
                OnPropertyChanged(nameof(BarHeight));
            }
        }

        private List<double> _redLinePositions = new List<double>();
        public List<double> RedLinePositions
        {
            get { return _redLinePositions; }
            private set
            {
                _redLinePositions = value;
                OnPropertyChanged(nameof(RedLinePositions));
            }
        }

        #endregion

        #region 私有方法

        /// <summary>
        /// 将数值转换为Y坐标位置
        /// 刻度范围：40 到 -40，对应Y坐标：20 到 420
        /// </summary>
        /// <param name="value">数值</param>
        /// <returns>Y坐标</returns>
        private double ValueToY(double value)
        {
            // 限制数值范围
            value = Math.Max(-40, Math.Min(40, value));
            
            // 线性映射：40对应Y=20，-40对应Y=420
            // Y = 220 - value * 5
            return 220 - value * 5;
        }

        /// <summary>
        /// 更新柱状图位置
        /// </summary>
        private void UpdateBarPosition()
        {
            if (Value >= 0)
            {
                // 正值：从0线向上
                BarTop = ValueToY(Value);
                BarHeight = ValueToY(0) - ValueToY(Value);
            }
            else
            {
                // 负值：从0线向下
                BarTop = ValueToY(0);
                BarHeight = ValueToY(Value) - ValueToY(0);
            }
        }

        /// <summary>
        /// 更新红线位置
        /// </summary>
        private void UpdateRedLinePositions()
        {
            var positions = new List<double>();
            if (RedLineValues != null)
            {
                foreach (var value in RedLineValues)
                {
                    positions.Add(ValueToY(value));
                }
            }
            RedLinePositions = positions;
        }

        #endregion

        #region 公共方法

        /// <summary>
        /// 设置传感器数据
        /// </summary>
        /// <param name="name">传感器名称</param>
        /// <param name="value">数值</param>
        /// <param name="redLines">红线数值列表</param>
        /// <param name="headerColor">标题背景色</param>
        public void SetSensorData(string name, double value, List<double> redLines = null, Color? headerColor = null)
        {
            SensorName = name;
            Value = value;
            
            if (redLines != null)
            {
                RedLineValues = new List<double>(redLines);
            }
            
            if (headerColor.HasValue)
            {
                HeaderBackground = new SolidColorBrush(headerColor.Value);
            }
        }

        /// <summary>
        /// 添加红线
        /// </summary>
        /// <param name="value">红线数值</param>
        public void AddRedLine(double value)
        {
            var lines = new List<double>(RedLineValues) { value };
            RedLineValues = lines;
        }

        /// <summary>
        /// 清除所有红线
        /// </summary>
        public void ClearRedLines()
        {
            RedLineValues = new List<double>();
        }

        #endregion
    }
}