using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using Microsoft.Win32;

namespace Better_Seewo.Manager.Pages
{
    /// <summary>
    /// InkPage.xaml 的交互逻辑
    /// 墨迹管理页面 - 导入和导出白板墨迹数据
    /// </summary>
    public partial class InkPage : Page
    {
        // ===== 导出历史记录集合 =====
        private ObservableCollection<ExportRecord> _exportHistory;

        // ===== 选中的导入文件路径 =====
        private string _selectedImportFile = string.Empty;

        /// <summary>
        /// 导出记录数据模型
        /// </summary>
        public class ExportRecord
        {
            public string FileName { get; set; } = string.Empty;
            public string FileSize { get; set; } = string.Empty;
            public string Time { get; set; } = string.Empty;
        }

        public InkPage()
        {
            InitializeComponent();
            InitializeExportHistory();
            Loaded += InkPage_Loaded;
        }

        /// <summary>
        /// 初始化导出历史列表
        /// </summary>
        private void InitializeExportHistory()
        {
            _exportHistory = new ObservableCollection<ExportRecord>();
            ExportHistoryList.ItemsSource = _exportHistory;
        }

        /// <summary>
        /// 页面加载时执行入场动画
        /// </summary>
        private void InkPage_Loaded(object sender, RoutedEventArgs e)
        {
            PlayEntranceAnimation();
        }

        /// <summary>
        /// 播放入场动画
        /// </summary>
        private void PlayEntranceAnimation()
        {
            // 简单的淡入动画
            var fadeAnimation = new DoubleAnimation
            {
                From = 0,
                To = 1,
                Duration = TimeSpan.FromMilliseconds(500),
                EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
            };
            BeginAnimation(OpacityProperty, fadeAnimation);
        }

        /// <summary>
        /// 浏览导出保存路径
        /// </summary>
        private void BtnBrowseExportPath_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new SaveFileDialog
            {
                Filter = "墨迹文件 (*.ink.json)|*.ink.json",
                DefaultExt = ".ink.json",
                FileName = ExportFileName.Text
            };

            if (dialog.ShowDialog() == true)
            {
                var directory = Path.GetDirectoryName(dialog.FileName);
                if (!string.IsNullOrEmpty(directory))
                {
                    ExportFolderPath.Text = directory;
                }
            }
        }

        /// <summary>
        /// 点击导入文件选择区域
        /// </summary>
        private void ImportFileDropZone_Click(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            var dialog = new OpenFileDialog
            {
                Filter = "墨迹文件 (*.ink.json)|*.ink.json",
                DefaultExt = ".ink.json",
                Title = "选择墨迹文件"
            };

            if (dialog.ShowDialog() == true)
            {
                _selectedImportFile = dialog.FileName;
                ImportFileNameText.Text = Path.GetFileName(dialog.FileName);
                PreviewImportFile(dialog.FileName);
                BtnImport.IsEnabled = true;
            }
        }

        /// <summary>
        /// 预览选中的导入文件
        /// </summary>
        private void PreviewImportFile(string filePath)
        {
            try
            {
                var fileInfo = new FileInfo(filePath);
                InkEmptyState.Visibility = Visibility.Collapsed;
                InkInfoPanel.Visibility = Visibility.Visible;

                // 显示文件基本信息
                InkFileSizeText.Text = FormatFileSize(fileInfo.Length);
                InkFormatText.Text = Path.GetExtension(filePath);
                InkTimestampText.Text = fileInfo.LastWriteTime.ToString("yyyy-MM-dd HH:mm:ss");

                // TODO: 解析ink.json获取实际笔画数
                // 当前为模拟数据
                StrokeCountText.Text = "128";
            }
            catch (Exception)
            {
                InkEmptyState.Visibility = Visibility.Visible;
                InkInfoPanel.Visibility = Visibility.Collapsed;
                ImportFileNameText.Text = "文件读取失败";
                BtnImport.IsEnabled = false;
            }
        }

        /// <summary>
        /// 格式化文件大小
        /// </summary>
        private static string FormatFileSize(long bytes)
        {
            if (bytes < 1024) return $"{bytes} B";
            if (bytes < 1024 * 1024) return $"{bytes / 1024.0:F1} KB";
            return $"{bytes / (1024.0 * 1024.0):F1} MB";
        }

        /// <summary>
        /// 执行导出操作（带进度动画）
        /// </summary>
        private async void BtnExport_Click(object sender, RoutedEventArgs e)
        {
            ExportProgressPanel.Visibility = Visibility.Visible;
            BtnExport.IsEnabled = false;

            try
            {
                await AnimateProgressAsync(ExportProgressBar, ExportProgressText, 0, 100, 2000);

                // TODO: 实际导出逻辑 - 序列化墨迹数据到ink.json文件
                var fileName = $"{ExportFileName.Text}.ink.json";
                var fullPath = Path.Combine(ExportFolderPath.Text, fileName);

                // 添加到导出历史
                _exportHistory.Insert(0, new ExportRecord
                {
                    FileName = fileName,
                    FileSize = "模拟数据",
                    Time = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")
                });

                // 最多保留10条记录
                while (_exportHistory.Count > 10)
                    _exportHistory.RemoveAt(_exportHistory.Count - 1);
            }
            finally
            {
                ExportProgressPanel.Visibility = Visibility.Collapsed;
                BtnExport.IsEnabled = true;
            }
        }

        /// <summary>
        /// 执行导入操作（带进度动画）
        /// </summary>
        private async void BtnImport_Click(object sender, RoutedEventArgs e)
        {
            if (string.IsNullOrEmpty(_selectedImportFile)) return;

            ImportProgressPanel.Visibility = Visibility.Visible;
            BtnImport.IsEnabled = false;

            try
            {
                await AnimateProgressAsync(ImportProgressBar, ImportProgressText, 0, 100, 1500);

                // TODO: 实际导入逻辑 - 读取ink.json并应用到白板
            }
            finally
            {
                ImportProgressPanel.Visibility = Visibility.Collapsed;
                BtnImport.IsEnabled = true;
            }
        }

        /// <summary>
        /// 播放进度条动画
        /// </summary>
        private async Task AnimateProgressAsync(FrameworkElement progressBar, TextBlock progressText,
            double from, double to, int durationMs)
        {
            var steps = 20;
            var stepMs = durationMs / steps;
            var increment = (to - from) / steps;

            for (int i = 0; i <= steps; i++)
            {
                var value = from + increment * i;
                var percent = (int)Math.Round(value);

                // 通过Dispatcher更新UI
                Dispatcher.Invoke(() =>
                {
                    progressText.Text = $"{percent}%";
                    var scaleX = value / 100.0;
                    var animation = new DoubleAnimation
                    {
                        From = progressBar.RenderTransform is ScaleTransform st ? st.ScaleX : scaleX,
                        To = scaleX,
                        Duration = TimeSpan.FromMilliseconds(stepMs),
                        EasingFunction = new QuadraticEase { EasingMode = EasingMode.EaseInOut }
                    };
                    progressBar.RenderTransform = new ScaleTransform(scaleX, 1);
                });

                await Task.Delay(stepMs);
            }
        }
    }
}