using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Windows;

namespace DrillTools
{
    /// <summary>
    /// 参数文件选择窗口，列出指定目录下所有 .txt 文件供用户选择。
    /// </summary>
    public partial class ParameterFileSelectionWindow : Window
    {
        /// <summary>
        /// 用户选中的文件完整路径；若取消则为 null。
        /// </summary>
        public string? SelectedFilePath { get; private set; }

        public ParameterFileSelectionWindow(string paramDirectory)
        {
            InitializeComponent();

            if (Directory.Exists(paramDirectory))
            {
                var files = Directory.GetFiles(paramDirectory, "*.txt")
                    .Select(f => new FileInfo(f))
                    .OrderBy(f => f.Name)
                    .ToList();

                FileListBox.ItemsSource = files;
            }

            OkButton.IsEnabled = false;
            FileListBox.SelectionChanged += (_, _) =>
            {
                OkButton.IsEnabled = FileListBox.SelectedItem != null;
            };

            // 双击直接确认
            FileListBox.MouseDoubleClick += (_, _) =>
            {
                if (FileListBox.SelectedItem is FileInfo file)
                {
                    SelectedFilePath = file.FullName;
                    DialogResult = true;
                    Close();
                }
            };
        }

        private void OkButton_Click(object sender, RoutedEventArgs e)
        {
            if (FileListBox.SelectedItem is FileInfo file)
            {
                SelectedFilePath = file.FullName;
                DialogResult = true;
                Close();
            }
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            DialogResult = false;
            Close();
        }
    }
}