/// <summary>
/// Event handler for the "Find Images" button. Fetches image URL's based on the field values in
/// the first tab, and uses that information to set field values in the second tab.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void FindImagesButton_Click(object sender, RoutedEventArgs e)
{
MainTabControl.SelectedItem = DownloadImagesTabItem;
// TODO: Refactor, and make this asynchronous so it doesn't block the main UI thread
// Get user input from XAML fields
string entity = EntityTextBox.Text;
RedditEntity type = (UserEntityType.IsChecked == true) ? RedditEntity.User : RedditEntity.Subreddit;
int maxPages;
if (!int.TryParse(MaxPagesTextBox.Text, out maxPages))
{
maxPages = 1;
}
// Parse Imgur image and album URL's for the given Reddit user or subuser, stopping when we
// either run out of pages or else hit the maximum page count
HashSet <string> imageUrls = new HashSet <string>();
HashSet <string> albumUrls = new HashSet <string>();
string nextPageCursor = "";
int pageCount = 1;
for ( ; pageCount <= maxPages && nextPageCursor != null; pageCount++)
{
Console.WriteLine("Processing page {0} for {1} {2}", pageCount, type.ToString().ToLower(), entity);
Uri redditUrl = RedditUtils.BuildUrl(entity, type, "".Equals(nextPageCursor) ? null : nextPageCursor);
RedditUtils.ParsePage(redditUrl, ref imageUrls, ref albumUrls, out nextPageCursor);
if (nextPageCursor != null)
{
Console.WriteLine("nextPageCursor == {0}", nextPageCursor);
}
}
Console.WriteLine("Parsed {0} image URL's and {1} album URL's from {2} pages", imageUrls.Count, albumUrls.Count, pageCount);
// Parse out image URL's from the albums
var imagesFromAlbums = albumUrls.SelectMany(albumUrl => ImgurUtils.ParseAlbum(new Uri(albumUrl)));
imageUrls.UnionWith(imagesFromAlbums);
Console.WriteLine("There are {0} total images after extracting {1} from albums", imageUrls.Count, imagesFromAlbums.ToList().Count);
PageCountLabel.Content = pageCount;
ImagesCountLabel.Content = imageUrls.Count;
ImagesDataGrid.ItemsSource = imageUrls.Select(imageUrl => new ImgurUrl {
URL = imageUrl
});
}
public static Uri BuildUrl(string entity, RedditEntity entityType, string cursor = null)
{
if (entity == null)
{
return(null);
}
string url = "https://www.reddit.com";
if (RedditEntity.Subreddit.Equals(entityType))
{
url += "/r/" + entity + ".json";
}
else
{
url += "/user/" + entity + "/submitted.json";
}
if (cursor != null)
{
url += "?after=" + cursor;
}
return(new Uri(url));
}
