public async Task <Result <CourseUpdateInfo> > TryUpdateAsync()
{
// Download the HTML page
Result <string> downloadResult = await _downloader
.TryDownloadCoursePageHtmlAsync(Constants.CareTranscriptOfRecordsUrl)
.ConfigureAwait(false);
if (!downloadResult.IsSuccessful)
{
return(downloadResult.ToResult <CourseUpdateInfo>());
}
// Parse the HTML page
var parseResult = _parser.TryParseCoursePage(downloadResult.Value);
if (!parseResult.IsSuccessful)
{
return(parseResult.ToResult <CourseUpdateInfo>());
}
// If we are good here we can remember the date time we last checked
_preferences.LastCourseUpdateCheck = _dateTime.UtcNow;
var existingCourses = _repository.All();
// Convert raw to actual courses
var currentCourses = parseResult.Value.Select(
rawCourse => Course.FromRawCourse(
rawCourse,
existingCourses.SingleOrDefault(ec => ec.Id == rawCourse.Id)?.DateOfLastUpdate
?? _dateTime.UtcNow
)
).ToArray();
// Compare our existing courses and our current ones.
_comparer.Compare(
existingCourses,
currentCourses,
out Course[] addedCourses,
out Course[] modifiedCourses,
private static CourseUpdater CreateCourseUpdater(
ICoursePageHtmlDownloader downloader = null,
ICoursePageHtmlParser parser = null,
ICourseSetComparer comparer = null,
ICourseRepository repository = null,
IUnitOfWork unitOfWork = null,
IDateTimeUtility dateTime = null,
IPreferencesUtility preferences = null
)
{
if (downloader == null)
{
downloader = Substitute.For <ICoursePageHtmlDownloader>();
downloader.TryDownloadCoursePageHtmlAsync(Arg.Any <string>())
.Returns(Task.FromResult(Result.WithSuccess <string>()));
}
if (parser == null)
{
parser = Substitute.For <ICoursePageHtmlParser>();
parser.TryParseCoursePage(Arg.Any <string>())
.Returns(Result.WithSuccess(new RawCourse[0]));
}
if (repository == null)
{
repository = Substitute.For <ICourseRepository>();
repository.All().Returns(new Course[0]);
}
if (unitOfWork == null)
{
unitOfWork = Substitute.For <IUnitOfWork>();
var session = Substitute.For <IUnitOfWorkSession>();
unitOfWork.OpenSession().Returns(session);
session.Commit().Returns(Result.Success);
}
if (dateTime == null)
{
dateTime = Substitute.For <IDateTimeUtility>();
dateTime.UtcNow.Returns(DateTime.UtcNow);
}
comparer = comparer ?? new CourseSetComparer();
preferences = preferences ?? Substitute.For <IPreferencesUtility>();
return(new CourseUpdater(
downloader,
parser,
comparer,
repository,
unitOfWork,
dateTime,
preferences
));
}