using FileManager_UWP.Model;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Storage;
using Windows.Web.Http.Headers;

namespace FileManager_UWP.Service {
    /// <summary>
    /// 负责提供本地文件及文件夹访问服务
    /// </summary>
    class FileService {
        /// <summary>
        /// 获得可显示的目录
        /// </summary>
        /// <param name="path">路径</param>
        /// <returns>文件和文件夹列表</returns>
        public async Task<List<IDisplayable>> GetDisplayFileFolderList(string path) {
            StorageFolder folder = null;
            try {
                folder = await StorageFolder.GetFolderFromPathAsync(path);
                IReadOnlyList<StorageFolder> folders = await folder.GetFoldersAsync();
                IReadOnlyList<StorageFile> files = await folder.GetFilesAsync();
                List<IDisplayable> displayFileFolderItems =
                    new List<IDisplayable> { await DisplayableFolder.GetParentAsync(folder) };
                //displayFileFolderItems.AddRange(folders
                //    .Select(async i => await DisplayFileFolderItem.GetInstance(i))
                //    .Select(i => i.Result)
                //);
                //displayFileFolderItems.AddRange(files
                //    .Select(async i => await DisplayFileFolderItem.GetInstance(i))
                //    .Select(i => i.Result)
                //);

                foreach (var file in folders) {
                    displayFileFolderItems.Add(
                        await DisplayableFolder.GetInstanceAsync(file));
                }

                foreach (var file in files) {
                    displayFileFolderItems.Add(
                        await DisplayableFile.GetInstanceAsync(file));
                }

                return displayFileFolderItems;
            } catch (Exception ex) {
                Debug.WriteLine(ex.Message);
                throw;
            }
        }
    }
}