using System;
using System.Diagnostics;
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>
    /// ConvertPage.xaml 的交互逻辑
    /// 格式转换页面 - PPTX 与 ENBX 格式互转
    /// </summary>
    public partial class ConvertPage : Page
    {
        // ===== 选中的文件路径 =====
        private string _selectedPptxFile = string.Empty;
        private string _selectedEnbxFile = string.Empty;
        private string _outputFile = string.Empty;

        public ConvertPage()
        {
            InitializeComponent();
            Loaded += ConvertPage_Loaded;
        }

        /// <summary>
        /// 页面加载时播放入场动画
        /// </summary>
        private void ConvertPage_Loaded(object sender, RoutedEventArgs e)
        {
            // 简单淡入
            var fadeIn = new DoubleAnimation
            {
                From = 0,
                To = 1,
                Duration = TimeSpan.FromMilliseconds(400),
                EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
            };
            BeginAnimation(OpacityProperty, fadeIn);
        }

        // ===== Tab 切换事件 =====

        /// <summary>
        /// 切换到 PPTX -> ENBX 模式（带滑动指示器动画）
        /// </summary>
        private void TabPptxToEnbx_Checked(object sender, RoutedEventArgs e)
        {
            PanelPptxToEnbx.Visibility = Visibility.Visible;
            PanelEnbxToPptx.Visibility = Visibility.Collapsed;

            // 滑动指示器动画
            AnimateTabIndicator(0);
        }

        /// <summary>
        /// 切换到 ENBX -> PPTX 模式（带滑动指示器动画）
        /// </summary>
        private void TabEnbxToPptx_Checked(object sender, RoutedEventArgs e)
        {
            PanelPptxToEnbx.Visibility = Visibility.Collapsed;
            PanelEnbxToPptx.Visibility = Visibility.Visible;

            // 滑动指示器动画
            AnimateTabIndicator(120);
        }

        /// <summary>
        /// Tab滑动指示器动画
        /// </summary>
        private void AnimateTabIndicator(double targetX)
        {
            var transform = (TranslateTransform)TabIndicator.RenderTransform;
            var animation = new DoubleAnimation
            {
                From = transform.X,
                To = targetX,
                Duration = TimeSpan.FromMilliseconds(300),
                EasingFunction = new CubicEase { EasingMode = EasingMode.EaseOut }
            };
            transform.BeginAnimation(TranslateTransform.XProperty, animation);
        }

        // ===== 文件选择事件 =====

        /// <summary>
        /// 选择 PPTX 文件
        /// </summary>
        private void BtnSelectPptx_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new OpenFileDialog
            {
                Filter = "PowerPoint 文件 (*.pptx)|*.pptx",
                DefaultExt = ".pptx",
                Title = "选择 PPTX 文件"
            };

            if (dialog.ShowDialog() == true)
            {
                _selectedPptxFile = dialog.FileName;
                PptxFileNameText.Text = Path.GetFileName(dialog.FileName);
                BtnConvertPptxToEnbx.IsEnabled = true;
            }
        }

        /// <summary>
        /// 选择 ENBX 文件
        /// </summary>
        private void BtnSelectEnbx_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new OpenFileDialog
            {
                Filter = "希沃白板文件 (*.enbx)|*.enbx",
                DefaultExt = ".enbx",
                Title = "选择 ENBX 文件"
            };

            if (dialog.ShowDialog() == true)
            {
                _selectedEnbxFile = dialog.FileName;
                EnbxFileNameText.Text = Path.GetFileName(dialog.FileName);
                BtnConvertEnbxToPptx.IsEnabled = true;
            }
        }

        // ===== 转换按钮事件 =====

        /// <summary>
        /// PPTX -> ENBX 转换
        /// </summary>
        private async void BtnConvertPptxToEnbx_Click(object sender, RoutedEventArgs e)
        {
            if (string.IsNullOrEmpty(_selectedPptxFile)) return;

            var stopwatch = Stopwatch.StartNew();
            ConvertProgressPanel.Visibility = Visibility.Visible;
            ConvertResultPanel.Visibility = Visibility.Collapsed;
            BtnConvertPptxToEnbx.IsEnabled = false;

            try
            {
                ConvertStatusText.Text = "正在读取PPTX文件...";
                await AnimateConvertProgressAsync(0, 30, 800);

                // TODO: 实际转换逻辑
                ConvertStatusText.Text = "正在解析页面结构...";
                await AnimateConvertProgressAsync(30, 60, 1000);

                ConvertStatusText.Text = "正在生成ENBX文件...";
                await AnimateConvertProgressAsync(60, 90, 1000);

                ConvertStatusText.Text = "正在完成...";
                await AnimateConvertProgressAsync(90, 100, 500);

                stopwatch.Stop();

                // 模拟输出文件
                _outputFile = Path.ChangeExtension(_selectedPptxFile, ".enbx");
                ShowConvertResult(_outputFile, "模拟文件", stopwatch.Elapsed);
            }
            finally
            {
                ConvertProgressPanel.Visibility = Visibility.Collapsed;
                BtnConvertPptxToEnbx.IsEnabled = true;
            }
        }

        /// <summary>
        /// ENBX -> PPTX 转换
        /// </summary>
        private async void BtnConvertEnbxToPptx_Click(object sender, RoutedEventArgs e)
        {
            if (string.IsNullOrEmpty(_selectedEnbxFile)) return;

            var stopwatch = Stopwatch.StartNew();
            ConvertProgressPanel.Visibility = Visibility.Visible;
            ConvertResultPanel.Visibility = Visibility.Collapsed;
            BtnConvertEnbxToPptx.IsEnabled = false;

            try
            {
                ConvertStatusText.Text = "正在读取ENBX文件...";
                await AnimateConvertProgressAsync(0, 25, 600);

                // TODO: 实际转换逻辑
                ConvertStatusText.Text = "正在提取资源...";
                await AnimateConvertProgressAsync(25, 55, 1000);

                ConvertStatusText.Text = "正在构建PPTX...";
                await AnimateConvertProgressAsync(55, 85, 1200);

                ConvertStatusText.Text = "正在完成...";
                await AnimateConvertProgressAsync(85, 100, 400);

                stopwatch.Stop();

                _outputFile = Path.ChangeExtension(_selectedEnbxFile, ".pptx");
                ShowConvertResult(_outputFile, "模拟文件", stopwatch.Elapsed);
            }
            finally
            {
                ConvertProgressPanel.Visibility = Visibility.Collapsed;
                BtnConvertEnbxToPptx.IsEnabled = true;
            }
        }

        /// <summary>
        /// 进度条平滑填充动画
        /// </summary>
        private async Task AnimateConvertProgressAsync(int from, int to, int durationMs)
        {
            int totalWidth = 800; // 假设进度条最大宽度
            var steps = 15;
            var stepMs = durationMs / steps;
            var increment = (double)(to - from) / steps;

            for (int i = 0; i <= steps; i++)
            {
                var percent = from + increment * i;
                Dispatcher.Invoke(() =>
                {
                    var targetWidth = totalWidth * (percent / 100.0);

                    // 平滑动画更新进度条宽度
                    var widthAnimation = new DoubleAnimation
                    {
                        From = ConvertProgressBar.Width,
                        To = targetWidth,
                        Duration = TimeSpan.FromMilliseconds(stepMs),
                        EasingFunction = new QuadraticEase { EasingMode = EasingMode.EaseInOut }
                    };
                    ConvertProgressBar.BeginAnimation(WidthProperty, widthAnimation);

                    ConvertPercentText.Text = $"{(int)Math.Round(percent)}%";
                });

                await Task.Delay(stepMs);
            }
        }

        /// <summary>
        /// 显示转换结果
        /// </summary>
        private void ShowConvertResult(string filePath, string fileSize, TimeSpan elapsed)
        {
            ConvertResultPanel.Visibility = Visibility.Visible;
            OutputFilePath.Text = Path.GetFileName(filePath);
            OutputFileSize.Text = fileSize;
            ConvertTime.Text = $"{elapsed.TotalMilliseconds:F0} ms";
        }

        /// <summary>
        /// 打开输出文件
        /// </summary>
        private void BtnOpenOutput_Click(object sender, RoutedEventArgs e)
        {
            if (!string.IsNullOrEmpty(_outputFile) && File.Exists(_outputFile))
            {
                try
                {
                    Process.Start(new ProcessStartInfo
                    {
                        FileName = _outputFile,
                        UseShellExecute = true
                    });
                }
                catch (Exception)
                {
                    MessageBox.Show("无法打开文件，文件可能不存在。", "提示",
                        MessageBoxButton.OK, MessageBoxImage.Information);
                }
            }
            else
            {
                MessageBox.Show("输出文件尚不存在（当前为模拟转换）。", "提示",
                    MessageBoxButton.OK, MessageBoxImage.Information);
            }
        }
    }
}