using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Media;

namespace XP.Hardware.RaySource.Converters
{
    /// <summary>
    /// 灯丝寿命百分比转颜色转换器 | Filament lifetime percentage to color converter
    /// 根据寿命使用百分比返回对应的颜色画刷：
    ///   低于 80% → 绿色 (#FF4CAF50)
    ///   80%-89%  → 黄色 (#FFFFC107)
    ///   90% 及以上 → 红色 (#FFE53935)
    /// </summary>
    public class FilamentLifetimeColorConverter : IValueConverter
    {
        // 预定义颜色画刷（避免重复创建）| Pre-defined color brushes (avoid repeated creation)
        private static readonly SolidColorBrush GreenBrush = new(Color.FromArgb(0xFF, 0x4C, 0xAF, 0x50));
        private static readonly SolidColorBrush YellowBrush = new(Color.FromArgb(0xFF, 0xFF, 0xC1, 0x07));
        private static readonly SolidColorBrush RedBrush = new(Color.FromArgb(0xFF, 0xE5, 0x39, 0x35));

        static FilamentLifetimeColorConverter()
        {
            // 冻结画刷以提升性能 | Freeze brushes for better performance
            GreenBrush.Freeze();
            YellowBrush.Freeze();
            RedBrush.Freeze();
        }

        /// <summary>
        /// 将寿命百分比（0-100）转换为对应颜色画刷 | Convert lifetime percentage (0-100) to corresponding color brush
        /// </summary>
        /// <param name="value">寿命百分比值（double，0-100）| Lifetime percentage value (double, 0-100)</param>
        /// <param name="targetType">目标类型 | Target type</param>
        /// <param name="parameter">转换参数（未使用）| Converter parameter (unused)</param>
        /// <param name="culture">区域信息 | Culture info</param>
        /// <returns>对应颜色的 SolidColorBrush | SolidColorBrush of corresponding color</returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is not double percentage)
            {
                return GreenBrush;
            }

            if (percentage >= 90)
            {
                return RedBrush;
            }

            if (percentage >= 80)
            {
                return YellowBrush;
            }

            return GreenBrush;
        }

        /// <summary>
        /// 反向转换（不支持，单向绑定）| Reverse conversion (not supported, one-way binding)
        /// </summary>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}