using Microsoft.Win32;
using System.IO;

namespace TeamAAS_VP.Services
{
    /// <summary>
    /// 文件对话框服务
    /// </summary>
    public class FileDialogService
    {
        /// <summary>
        /// 打开图像文件对话框
        /// </summary>
        public string OpenImageFile()
        {
            var dialog = new OpenFileDialog
            {
                Title = "选择图像文件",
                Filter = "图像文件|*.jpg;*.jpeg;*.png;*.bmp;*.tiff;*.tif|所有文件|*.*",
                FilterIndex = 1,
                RestoreDirectory = true
            };

            if (dialog.ShowDialog() == true)
            {
                return dialog.FileName;
            }

            return null;
        }

        /// <summary>
        /// 保存文件对话框
        /// </summary>
        public string SaveFile(string defaultFileName, string filter)
        {
            var dialog = new SaveFileDialog
            {
                FileName = defaultFileName,
                Filter = filter,
                RestoreDirectory = true
            };

            if (dialog.ShowDialog() == true)
            {
                return dialog.FileName;
            }

            return null;
        }

        /// <summary>
        /// 验证文件是否存在
        /// </summary>
        public bool FileExists(string filePath)
        {
            return !string.IsNullOrEmpty(filePath) && File.Exists(filePath);
        }
    }
}