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

namespace DrillTools
{
    /// <summary>
    /// 钻带参数文件选择窗口，列出 A01-A14 文件并以第一行描述文本展示供用户选择。
    /// </summary>
    public partial class DrlParameterSelectionWindow : 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 DrlParameterSelectionWindow(string paramDirectory)
        {
            InitializeComponent();

            var items = new List<ParamFileItem>();
            for (int i = 1; i <= 14; i++)
            {
                string fileName = $"A{i:D2}";
                string filePath = Path.Combine(paramDirectory, fileName);

                if (!File.Exists(filePath))
                    continue;

                string description = ReadFirstLineDescription(filePath);
                items.Add(new ParamFileItem
                {
                    FileName = fileName,
                    FilePath = filePath,
                    Description = $"{fileName}  —  {description}"
                });
            }

            FileListBox.ItemsSource = items;
            OkButton.IsEnabled = false;

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

            FileListBox.MouseDoubleClick += (_, _) =>
            {
                if (FileListBox.SelectedItem is ParamFileItem item)
                {
                    SelectedFilePath = item.FilePath;
                    DialogResult = true;
                    Close();
                }
            };
        }

        /// <summary>
        /// 读取参数文件的第一行描述文本（去掉前导分号）。
        /// </summary>
        private static string ReadFirstLineDescription(string filePath)
        {
            try
            {
                string content = CommandTypeFileReader.ReadAllText(filePath);
                var lines = DrillTapeLineParser.SplitLines(content);
                if (lines.Count > 0)
                {
                    string firstLine = lines[0].Text.Trim();
                    if (firstLine.StartsWith(";"))
                        return firstLine[1..].Trim();
                    return firstLine;
                }
                return "(无法读取)";
            }
            catch
            {
                return "(无法读取)";
            }
        }

        private void OkButton_Click(object sender, RoutedEventArgs e)
        {
            if (FileListBox.SelectedItem is ParamFileItem item)
            {
                SelectedFilePath = item.FilePath;
                DialogResult = true;
                Close();
            }
        }

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

        private class ParamFileItem
        {
            public string FileName { get; init; } = string.Empty;
            public string FilePath { get; init; } = string.Empty;
            public string Description { get; init; } = string.Empty;
        }
    }
}