public async Task <CourseExportResults> UpdateCourse(Course course, CourseUpdateOptions updateOptions)
{
var results = new CourseExportResults(course.Id, updateOptions.StepikCourseId);
try
{
await TryUpdateCourse(course, updateOptions, results).ConfigureAwait(false);
}
catch (Exception e)
{
results.Exception = e;
}
return(results);
}
private async Task TryUpdateCourse(Course course, CourseUpdateOptions updateOptions, CourseExportResults results)
{
results.Info($"Downloading stepik course #{updateOptions.StepikCourseId}");
var stepikCourse = await client.GetCourse(updateOptions.StepikCourseId).ConfigureAwait(false);
results.StepikCourseTitle = stepikCourse.Title;
results.Info($"Downloading stepik sections for it ({string.Join(", ", stepikCourse.SectionsIds)})");
var stepikSections = new Dictionary <int, StepikApiSection>();
// TODO (andgein): download multiple sections in one request
foreach (var sectionId in stepikCourse.SectionsIds)
{
stepikSections[sectionId] = await client.GetSection(sectionId).ConfigureAwait(false);
}
var stepikUnitsIds = stepikSections.SelectMany(kvp => kvp.Value.UnitsIds).ToList();
results.Info($"Downloading stepik units ({string.Join(", ", stepikUnitsIds)}) and lessons for them");
var stepikUnits = new Dictionary <int, StepikApiUnit>();
foreach (var unitId in stepikUnitsIds)
{
stepikUnits[unitId] = await client.GetUnit(unitId).ConfigureAwait(false);
}
var stepikLessonsIds = stepikUnits.Select(kvp => kvp.Value.LessonId);
var stepikLessons = new Dictionary <int, StepikApiLesson>();
foreach (var lessonId in stepikLessonsIds)
{
stepikLessons[lessonId] = await client.GetLesson(lessonId).ConfigureAwait(false);
}
var sectionIndex = stepikCourse.SectionsIds.Count;
foreach (var slideUpdateOptions in updateOptions.SlidesUpdateOptions)
{
var slideId = slideUpdateOptions.SlideId;
var slide = course.FindSlideById(slideId);
if (slide == null)
{
results.Error($"Unable to find slide {slideId}, continue without it");
continue;
}
results.Info($"Updating slide «{slide.Title}» with id {slide.Id}");
var stepId = slideUpdateOptions.InsertAfterStep;
StepikApiLesson lesson;
int position;
if (stepId != -1 && stepikLessons.Values.Any(l => l.StepsIds.Contains(stepId)))
{
var lessonId = stepikLessons.FirstOrDefault(kvp => kvp.Value.StepsIds.Contains(stepId)).Key;
// Re-download lesson because it can be changed for a while
lesson = await client.GetLesson(lessonId).ConfigureAwait(false);
position = lesson.StepsIds.FindIndex(stepId);
results.Info($"Removing old steps created for this slide: {string.Join(", ", slideUpdateOptions.RemoveStepsIds)}");
await RemoveStepsFromLesson(lesson, slideUpdateOptions.RemoveStepsIds, results).ConfigureAwait(false);
}
else
{
results.Info("Creating new stepik lesson for this slide");
lesson = await CreateLessonAndSectionForSlide(slide, stepikCourse, ++sectionIndex).ConfigureAwait(false);
position = 0;
}
results.Info($"Inserting steps for slide «{slide.Title}» into lesson {lesson.Id} on position {position}");
await InsertSlideAsStepsInLesson(course, slide, lesson.Id.Value, position + 1, updateOptions, results);
}
}