using System.Configuration;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows;
using System.Collections.ObjectModel;

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);
            RegisterShellContextMenu();

            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;

            // 只读取和解析文件一次，提取所有需要的信息
            string content = CommandTypeFileReader.ReadAllText(filePath);
            var viewModel = new MainWindowViewModel
            {
                IsStartupDrillTapeFile = true,
                OriginalFilePath = filePath,
                ShouldCheckSortFileOnLoad = false
            };
            viewModel.LoadToolsFromDrillTape(content);

            bool canClearParameters = DrillTapeParameterCleaner.CanClearParameters(content);
            bool canGeneratePpDrillTape = viewModel.CanGeneratePpDrillTape;
            string extension = Path.GetExtension(filePath).ToLowerInvariant();
            bool canScaleDrillTape = extension == ".dr2" || extension == ".dpin";
            double minDrill = viewModel.MinDrillDiameter;
            double minSlot = viewModel.MinSlotDiameter;
            double minEA = viewModel.MinEADiameter;
            bool isPpDrillTape = viewModel.IsPpDrillTape;
            double ppXSpacing = viewModel.PpXSpacing;
            double ppYSpacing = viewModel.PpYSpacing;
            bool hasOuter3175Spacing = viewModel.HasOuter3175Spacing;
            double outer3175XSpacing = viewModel.Outer3175XSpacing;
            double outer3175YSpacing = viewModel.Outer3175YSpacing;

            var selectionViewModel = new StartupSelectionViewModel
            {
                FileName = Path.GetFileNameWithoutExtension(filePath),
                MinDrillDiameter = minDrill,
                MinSlotDiameter = minSlot,
                MinEADiameter = minEA,
                IsPpDrillTape = isPpDrillTape,
                PpXSpacing = ppXSpacing,
                PpYSpacing = ppYSpacing,
                HasOuter3175Spacing = hasOuter3175Spacing,
                Outer3175XSpacing = outer3175XSpacing,
                Outer3175YSpacing = outer3175YSpacing
            };

            // 叠板计算用的最小刀径独立遍历 Tools 计算，包含 0.749mm
            CalculateStackMinDiameters(viewModel.Tools, selectionViewModel);

            var selectionWindow = new StartupSelectionWindow(
                selectionViewModel,
                canClearParameters,
                canGeneratePpDrillTape,
                canScaleDrillTape);
            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;
                case StartupAction.GeneratePpDrillTape:
                    PerformPpDrillTapeGeneration(filePath);
                    Shutdown();
                    break;
                case StartupAction.ScaleDrillTape:
                    PerformDrillScaling(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
                {
                    ShouldCheckSortFileOnLoad = false
                };

                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 void PerformPpDrillTapeGeneration(string filePath)
        {
            try
            {
                var viewModel = new MainWindowViewModel
                {
                    IsStartupDrillTapeFile = true,
                    OriginalFilePath = filePath,
                    ShouldCheckSortFileOnLoad = false
                };

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

                System.Windows.MessageBox.Show(
                    $"PP钻带已生成：\n{outputFilePath}",
                    "生成PP钻带完成",
                    MessageBoxButton.OK,
                    MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show($"生成PP钻带失败：\n{ex.Message}",
                    "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        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);
            }
        }

        private static void PerformDrillScaling(string filePath)
        {
            try
            {
                var scalingWindow = new DrillScalingWindow();
                scalingWindow.ShowDialog();

                if (scalingWindow.ScalingResult == null)
                    return;

                var result = scalingWindow.ScalingResult.Value;

                string content = CommandTypeFileReader.ReadAllText(filePath);
                string scaledContent = Integration.ExcellonScaler.Scale(content, result.Kx, result.Ky);

                // 备份原文件
                string backupFilePath = filePath + ".bak";
                File.Copy(filePath, backupFilePath, true);

                // 写入缩放后的内容
                using var writer = new StreamWriter(filePath, false, Encoding.GetEncoding(936));
                writer.Write(scaledContent);

                // 系数记忆：紧跟钻带写回立即落盘，不滞后到完成提示之后。
                // 属辅助功能，失败不回滚已完成的涨缩，失败原因随完成提示一并告知。
                string? memoryWarning = null;
                try
                {
                    ScalingProfileStore.Save(result.Mode, result.InputX, result.InputY, Path.GetFileName(filePath));
                }
                catch (Exception ex)
                {
                    memoryWarning = $"\n（系数记忆保存失败：{ex.Message}）";
                }

                string completionMessage = $"涨缩完成，原文件已备份为：\n{Path.GetFileName(filePath)}.bak";
                if (memoryWarning != null)
                    completionMessage += memoryWarning;

                System.Windows.MessageBox.Show(
                    completionMessage,
                    "涨缩完成",
                    MessageBoxButton.OK,
                    MessageBoxImage.Information);
            }
            catch (Exception ex)
            {
                System.Windows.MessageBox.Show($"涨缩失败：\n{ex.Message}",
                    "错误", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }

        private static void RegisterShellContextMenu()
        {
            try
            {
                string exePath = Process.GetCurrentProcess().MainModule!.FileName!;
                string[] extensions = { ".drl", ".dr2", ".dr3", ".trg", ".dpin", ".txt" };
                string menuText = "用DrillTools打开";

                foreach (string ext in extensions)
                {
                    string keyPath = $@"SystemFileAssociations\{ext}\shell\{menuText}\command";
                    using var key = Microsoft.Win32.Registry.ClassesRoot.CreateSubKey(keyPath);
                    key.SetValue("", $"\"{exePath}\" \"%1\"");
                }
            }
            catch
            {
                // 非管理员权限时注册可能失败，静默忽略不影响主功能
            }
        }

        /// <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", ".dr3", ".trg", ".dpin" };

            return supportedExtensions.Contains(extension);
        }

        /// <summary>
        /// 从 MainWindowViewModel.Tools 独立遍历计算叠板用最小刀径。
        /// 分类逻辑与 UpdateMinDiameterInfo 一致（按尾号使用标准），不排除 0.749mm；
        /// 特殊固定孔径（3.203 等）不参与叠板计算。
        /// </summary>
        private static void CalculateStackMinDiameters(
            ObservableCollection<ToolItem> tools,
            StartupSelectionViewModel selectionViewModel)
        {
            var (minDrill, minSlot, minEA) = ToolItem.CalculateMinDiameters(tools, exclude749ForDisplay: false);
            selectionViewModel.StackCalcMinDrill = minDrill;
            selectionViewModel.StackCalcMinSlot = minSlot;
            selectionViewModel.StackCalcMinEA = minEA;
        }
    }
}