using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using Telerik.Windows.Controls;
using XP.Hardware.RaySource.ViewModels;

namespace XP.Hardware.RaySource.Views
{
    /// <summary>
    /// 射线源操作视图 code-behind | X-Ray Source Operate View code-behind
    /// 负责将滑块 DragCompleted / 输入框确认操作桥接到 ViewModel 命令
    /// Bridges slider DragCompleted / numeric confirm actions to ViewModel commands
    /// </summary>
    public partial class RaySourceOperateView : UserControl
    {
        // 防止初始化阶段触发写入 | Prevent writes during initialization
        private bool _isLoaded = false;

        // 标记输入框是否正在键盘输入中（区分手动输入和箭头点击）
        // Flag whether numeric input is in keyboard editing (distinguish manual input from arrow click)
        private bool _isVoltageEditing = false;
        private bool _isCurrentEditing = false;

        public RaySourceOperateView()
        {
            InitializeComponent();

            // 滑块拖动完成时提交值到硬件 | Apply value to hardware when slider drag completes
            VoltageSlider.DragCompleted += VoltageSlider_DragCompleted;
            CurrentSlider.DragCompleted += CurrentSlider_DragCompleted;

            // 输入框事件 | Numeric input events
            VoltageNumeric.GotKeyboardFocus += (s, e) => _isVoltageEditing = true;
            VoltageNumeric.LostFocus += VoltageNumeric_LostFocus;
            VoltageNumeric.KeyDown += VoltageNumeric_KeyDown;
            VoltageNumeric.ValueChanged += VoltageNumeric_ValueChanged;

            CurrentNumeric.GotKeyboardFocus += (s, e) => _isCurrentEditing = true;
            CurrentNumeric.LostFocus += CurrentNumeric_LostFocus;
            CurrentNumeric.KeyDown += CurrentNumeric_KeyDown;
            CurrentNumeric.ValueChanged += CurrentNumeric_ValueChanged;

            Loaded += OnViewLoaded;
            Unloaded += OnViewUnloaded;
        }

        /// <summary>
        /// 界面加载完成：标记已加载并触发自动初始化流程
        /// View loaded: mark as loaded and trigger auto-initialization sequence
        /// 参考旧代码 AreaDetector_Load 模式 | Follows AreaDetector_Load pattern from legacy code
        /// </summary>
        private async void OnViewLoaded(object sender, RoutedEventArgs e)
        {
            _isLoaded = true;

            if (DataContext is RaySourceOperateViewModel vm)
            {
                await vm.AutoInitializeAsync();
            }
        }

        /// <summary>
        /// 界面卸载：触发 ViewModel 的 Dispose 执行断开操作
        /// View unloaded: trigger ViewModel Dispose to execute disconnect
        /// </summary>
        private void OnViewUnloaded(object sender, RoutedEventArgs e)
        {
            if (DataContext is RaySourceOperateViewModel vm)
            {
                vm.Dispose();
            }
        }

        /// <summary>
        /// 判断是否可以提交（已加载、非设备反馈更新中）| Check if can apply (loaded and not updating from device)
        /// </summary>
        private bool CanApply(out RaySourceOperateViewModel vm)
        {
            vm = null;
            if (!_isLoaded) return false;
            if (DataContext is not RaySourceOperateViewModel viewModel) return false;
            if (viewModel.IsUpdatingFromDevice) return false;
            vm = viewModel;
            return true;
        }

        #region 滑块事件 | Slider Events

        /// <summary>
        /// 电压滑块拖动完成 | Voltage slider drag completed
        /// </summary>
        private void VoltageSlider_DragCompleted(object sender, RadDragCompletedEventArgs e)
        {
            if (CanApply(out var vm))
                vm.ApplyVoltageCommand.Execute();
        }

        /// <summary>
        /// 电流滑块拖动完成 | Current slider drag completed
        /// </summary>
        private void CurrentSlider_DragCompleted(object sender, RadDragCompletedEventArgs e)
        {
            if (CanApply(out var vm))
                vm.ApplyCurrentCommand.Execute();
        }

        #endregion

        #region 电压输入框事件 | Voltage Numeric Events

        /// <summary>
        /// 电压输入框值变更：仅在非键盘编辑时提交（即箭头按钮点击）
        /// Voltage numeric value changed: only apply when not keyboard editing (i.e. arrow button click)
        /// </summary>
        private void VoltageNumeric_ValueChanged(object sender, RadRangeBaseValueChangedEventArgs e)
        {
            if (!_isVoltageEditing && CanApply(out var vm))
                vm.ApplyVoltageCommand.Execute();
        }

        /// <summary>
        /// 电压输入框回车确认 | Voltage numeric Enter key confirm
        /// </summary>
        private void VoltageNumeric_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter && CanApply(out var vm))
            {
                _isVoltageEditing = false;
                vm.ApplyVoltageCommand.Execute();
            }
        }

        /// <summary>
        /// 电压输入框失焦确认 | Voltage numeric lost focus confirm
        /// </summary>
        private void VoltageNumeric_LostFocus(object sender, RoutedEventArgs e)
        {
            if (_isVoltageEditing && CanApply(out var vm))
            {
                _isVoltageEditing = false;
                vm.ApplyVoltageCommand.Execute();
            }
        }

        #endregion

        #region 电流输入框事件 | Current Numeric Events

        /// <summary>
        /// 电流输入框值变更：仅在非键盘编辑时提交（即箭头按钮点击）
        /// Current numeric value changed: only apply when not keyboard editing (i.e. arrow button click)
        /// </summary>
        private void CurrentNumeric_ValueChanged(object sender, RadRangeBaseValueChangedEventArgs e)
        {
            if (!_isCurrentEditing && CanApply(out var vm))
                vm.ApplyCurrentCommand.Execute();
        }

        /// <summary>
        /// 电流输入框回车确认 | Current numeric Enter key confirm
        /// </summary>
        private void CurrentNumeric_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter && CanApply(out var vm))
            {
                _isCurrentEditing = false;
                vm.ApplyCurrentCommand.Execute();
            }
        }

        /// <summary>
        /// 电流输入框失焦确认 | Current numeric lost focus confirm
        /// </summary>
        private void CurrentNumeric_LostFocus(object sender, RoutedEventArgs e)
        {
            if (_isCurrentEditing && CanApply(out var vm))
            {
                _isCurrentEditing = false;
                vm.ApplyCurrentCommand.Execute();
            }
        }

        #endregion
    }
}