/// <summary>
/// Get all tweets
/// </summary>
/// <param name="tweetTxtFileName"></param>
/// <param name="users"></param>
/// <returns></returns>
public List <Tweet> GetAllTweets(string tweetTxtFileName, List <User> users)
{
_fileToRead = Enums.FileToRead.tweet;
var lines = StringReader(tweetTxtFileName).ToList();
// Build list of tweets
return(lines.Select(line =>
{
var content = line.Substring(line.IndexOf(">", StringComparison.Ordinal) + 1, line.Length - line.IndexOf(">", StringComparison.Ordinal) - 1);
var nameOfUserOfTweet = line.Substring(0, line.IndexOf(">", StringComparison.Ordinal));
var user = users.SingleOrDefault(x => x.Name.Equals(nameOfUserOfTweet));// Use SingleOrDefault as it is possible the file contains a tweet with a name of someone that isn't in the users file. So potentially null
return new Tweet
{
Id = lines.IndexOf(line) + 1,
Content = content,
UserId = user?.Id ?? 0
};
}).ToList());
}
/// <summary>
/// Get all users and all the followers for each user
/// </summary>
/// <param name="userTxtFileName"></param>
/// <returns></returns>
public List <User> GetUsersAndTheirFollowers(string userTxtFileName)
{
_fileToRead = Enums.FileToRead.user;
var lines = StringReader(userTxtFileName).ToList();
// Build list of users
var names = lines.SelectMany(x => x.Replace(" follows", ",").Replace(" ", "").Split(',')).Distinct().ToList();
var users = names.Select(name => new User
{
Id = names.IndexOf(name) + 1,
Name = name
}).ToList();
// Build list of followers
var namesOfFollowers = lines.Select(x => x.Substring(0, x.IndexOf("follows", StringComparison.Ordinal) - 1)).Distinct().ToList();
var followers = namesOfFollowers
.Select(nameOfFollower =>
{
var linesWhereUserFollowed = lines.Where(line => line.Substring(0, line.IndexOf("follows", StringComparison.Ordinal) - 1).Equals(nameOfFollower));
var usersFollowed = linesWhereUserFollowed.SelectMany(line => line.Substring(line.IndexOf("follows", StringComparison.Ordinal) + 8, line.Length - line.IndexOf("follows", StringComparison.Ordinal) - 8).Replace(" ", "").Split(',')).Distinct().ToList();
var user = users.Single(x => x.Name.Equals(nameOfFollower));
return(new Follower
{
Id = namesOfFollowers.IndexOf(nameOfFollower) + 1,
UserId = user.Id,
Name = nameOfFollower,
UserIdsFollowed = usersFollowed.Select(x => users.Single(y => y.Name.Equals(x)).Id).ToList()
});
}).ToList();
// Map followers into User.Followers
AddFollowerToUser(users, followers);
return(users);
}
