using System.Configuration;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows;

namespace DrillTools
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : System.Windows.Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

            string? filePath = null;
            if (e.Args.Length > 0)
            {
                filePath = e.Args[0];
                if (!IsValidDrillTapeFile(filePath))
                    filePath = null;
            }

            if (filePath == null)
            {
                ShowMainWindow(null);
                return;
            }

            // 防止选择窗口关闭后触发 OnLastWindowClose 导致应用退出
            ShutdownMode = ShutdownMode.OnExplicitShutdown;

            bool canClearParameters = CanClearDrillTapeParameters(filePath);
            var selectionWindow = new StartupSelectionWindow(filePath, canClearParameters);
            selectionWindow.ShowDialog();

            switch (selectionWindow.SelectedAction)
            {
                case StartupAction.AdjustToolOrder:
                    ShutdownMode = ShutdownMode.OnLastWindowClose;
                    ShowMainWindow(filePath);
                    break;
                case StartupAction.ExportHoleCount:
                    PerformHeadlessExport(filePath);
                    Shutdown();
                    break;
                case StartupAction.ClearParameters:
                    PerformParameterCleanup(filePath);
                    Shutdown();
                    break;
                default:
                    Shutdown();
                    break;
            }
        }

        private static void ShowMainWindow(string? filePath)
        {
            try
            {
                MainWindow mainWindow = new MainWindow(filePath);
                mainWindow.Show();
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show($"创建MainWindow时发生异常:\n{ex.GetType().Name} - {ex.Message}\n\n{ex.StackTrace}",
                    "启动失败", MessageBoxButton.OK, MessageBoxImage.Error);
                throw;
            }
        }

        private static void PerformHeadlessExport(string filePath)
        {
            try
            {
                var viewModel = new MainWindowViewModel();

                string content = CommandTypeFileReader.ReadAllText(filePath);
                viewModel.OriginalFilePath = filePath;
                viewModel.LoadToolsFromDrillTape(content);

                if (viewModel.Tools.Count == 0)
                {
                    System.Windows.MessageBox.Show("钻带文件中未找到有效的刀具数据，无法导出孔数报表。",
                        "提示", MessageBoxButton.OK, MessageBoxImage.Warning);
                    return;
                }

                viewModel.ExportDrillUsageReport();
            }
            catch (OperationCanceledException)
            {
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show($"导出孔数报表失败：\n{ex.Message}",
                    "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private static bool CanClearDrillTapeParameters(string filePath)
        {
            try
            {
                string content = CommandTypeFileReader.ReadAllText(filePath);
                return DrillTapeParameterCleaner.CanClearParameters(content);
            }
            catch
            {
                return false;
            }
        }

        private static void PerformParameterCleanup(string filePath)
        {
            try
            {
                DrillTapeParameterCleaner.ClearParametersAndSave(filePath);
                System.Windows.MessageBox.Show(
                    $"参数已清空，原文件已备份为：\n{Path.GetFileName(filePath)}.bak",
                    "清空参数完成",
                    MessageBoxButton.OK,
                    MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show($"清空参数失败：\n{ex.Message}",
                    "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        /// <summary>
        /// 验证是否为有效的钻带文件
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>是否为有效钻带文件</returns>
        private static bool IsValidDrillTapeFile(string filePath)
        {
            if (string.IsNullOrEmpty(filePath))
                return false;

            if (!File.Exists(filePath))
                return false;

            // 检查文件扩展名是否为支持的钻带文件格式
            string extension = Path.GetExtension(filePath).ToLowerInvariant();
            string[] supportedExtensions = { ".txt", ".drl", ".dr2", ".dpin" };

            return supportedExtensions.Contains(extension);
        }
    }
}