/// <summary>Get the top posts from hackernews.com in json string format</summary>
/// <param name="numberOfPosts">Number of posts you want to get (0 > posts < 101)</param>
/// <returns>a string containing the number of posts specified in a json format</returns>
public async Task <string> GetXNumberOfTopHackerNewsPosts(int numberOfPosts)
{
string storyInfo = "";
if (numberOfPosts > 0 && numberOfPosts < 101)
{
var data = await HackerNewsAPI.GetTopHackerNewsStoryIds();
List <int> storyIds = parseListOfStoryIdsFromJson(data, numberOfPosts);
storyInfo = await GetStoriesBasedOnStoryIds(storyIds);
}
else
{
storyInfo = "Number of posts specified is out of bounds. Please enter a value between 0 and 100";
}
return(storyInfo);
}
/// <summary>Get a single story from hacker news based on the id</summary>
/// <param name="storyIds">hacker news post Id</param>
/// <param name="rank">the rank at which the story is on hacker news</param>
/// <returns>A StoryInfo object with fields containing info about the story</returns>
static async Task <StoryInfo> GetStoryBasedOnStoryIdAndRank(int storyId, int rank)
{
//Get the story information
string json = await HackerNewsAPI.GetHackerNewsStoriesById(storyId);
JObject storyInfo = (JObject)JsonConvert.DeserializeObject(json);
//Title
StoryInfo hnInfo = new StoryInfo();
if (storyInfo.GetValue("title") != null)
{
string title = storyInfo.GetValue("title").ToString();
//Check if title is non-empty string
if (!String.IsNullOrEmpty(title) && title.Length < 257)
{
hnInfo.Title = title;
}
else if (title.Length > 256)
{
hnInfo.Title = "Title too long";
}
else
{
hnInfo.Title = "No Title Available";
}
}
//Uri
if (storyInfo.GetValue("url") != null)
{
hnInfo.Uri = storyInfo.GetValue("url").ToString();
//Check if URL is valid
Uri uriResult;
bool result = Uri.TryCreate(hnInfo.Uri, UriKind.Absolute, out uriResult) &&
(uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
if (!result)
{
hnInfo.Uri = hnInfo.Uri + " (Invalid Uri)";
}
}
//Author
if (storyInfo.GetValue("by") != null)
{
string author = storyInfo.GetValue("by").ToString();
//Check if Author is non-empty string
if (!String.IsNullOrEmpty(author) && author.Length < 257)
{
hnInfo.Author = author;
}
else if (author.Length > 257)
{
hnInfo.Author = "Author name too long";
}
else
{
hnInfo.Author = "No Author Available";
}
}
//Points
if (storyInfo.GetValue("score") != null)
{
string score = storyInfo.GetValue("score").ToString();
//Check if greater or equal to zero
bool isInt = int.TryParse(score, out int intScore);
if (isInt && intScore >= 0)
{
hnInfo.Points = score;
}
else
{
hnInfo.Points = "No score available";
}
}
//Comments
if (storyInfo.GetValue("descendants") != null)
{
string comments = storyInfo.GetValue("descendants").ToString();
//Check if greater or equal to zero
bool isInt = int.TryParse(comments, out int intComments);
if (isInt && intComments >= 0)
{
hnInfo.comments = comments;
}
else
{
hnInfo.comments = "No comment info available";
}
}
//Rank
//Check if greater or equal to zero
if (rank >= 0)
{
hnInfo.rank = rank.ToString();
}
else
{
hnInfo.rank = "No Rank Info Available";
}
// Convert DtoryInfo object to JOSN string format
//string jsonData = JsonConvert.SerializeObject(hnInfo, Formatting.Indented);
return(hnInfo);
}