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);
}
public async Task <CourseExportResults> InitialExportCourse(Course course, CourseInitialExportOptions exportOptions)
{
var results = new CourseExportResults(course.Id, exportOptions.StepikCourseId);
try
{
await TryInitialExportCourse(course, exportOptions, results);
}
catch (Exception e)
{
results.Error(e.Message);
results.Exception = e;
}
return(results);
}
private async Task <StepikApiBlock> ConvertUlearnNonTextBlockIntoStepikStepBlock(SlideBlock block, StepikApiBlock lastTextBlock, string courseId, Slide slide, int lessonId, CourseExportOptions options, CourseExportResults results)
{
switch (block)
{
case AbstractExerciseBlock exerciseBlock:
return(new StepikApiBlock
{
Name = "external-grader",
Text = lastTextBlock.Text,
Cost = ((ExerciseSlide)slide).Scoring.PassedTestsScore,
Source = new StepikApiExternalGraderBlockSource(courseId, slide.Id, options.XQueueName, exerciseBlock.ExerciseInitialCode, stepikCSharpLanguageName)
});
case ChoiceBlock choiceBlock:
return(new StepikApiBlock
{
Name = "choice",
Text = lastTextBlock.Text + $"<p><br/><b>{choiceBlock.Text.EscapeHtml()}</b></p>",
Cost = choiceBlock.MaxScore,
Source = new StepikApiChoiceBlockSource(choiceBlock.Items.Select(ConvertUlearnChoiceItemIntoStepikChoiceOption))
{
IsMultipleChoice = choiceBlock.Multiple,
PreserveOrder = !choiceBlock.Shuffle
}
});
case YoutubeBlock videoBlock:
{
var rawVideoUrl = await youtubeVideoUrlExtractor.GetVideoUrl(videoBlock.GetYoutubeUrl()).ConfigureAwait(false);
var video = await client.UploadVideo(rawVideoUrl, lessonId).ConfigureAwait(false);
await Task.Delay(options.PauseAfterVideoUploaded).ConfigureAwait(false);
return(new StepikApiBlock
{
Name = "video",
Video = video,
});
}
default:
results.Error($"Unknown block type for converting into stepik step: {block.GetType().Name}, ignoring it");
return(null);
}
}
/* Convert ulearn's blocks and group some of them into on stepik's text block*/
private async Task <IEnumerable <StepikApiBlock> > ConvertUlearnBlocksIntoStepikBlocks(string courseId, Slide slide, IEnumerable <SlideBlock> blocks, CourseExportOptions options, int stepikLessonId, CourseExportResults results)
{
var stepikBlocks = new List <StepikApiBlock>();
var previousTextBlock = new StepikApiBlock
{
Name = "text",
Text = "",
};
var attachTextBlocksToInteractiveContent = slide is QuizSlide || slide is ExerciseSlide;
foreach (var block in blocks)
{
if (block.Hide)
{
continue;
}
var isCurrentBlockText = IsCurrentBlockText(block, options);
if (isCurrentBlockText)
{
previousTextBlock.Text += GetTextForStepikBlockFromUlearnBlock(courseId, slide, block);
}
else
{
if (!string.IsNullOrEmpty(previousTextBlock.Text) && !attachTextBlocksToInteractiveContent)
{
stepikBlocks.Add(previousTextBlock);
previousTextBlock = new StepikApiBlock
{
Name = "text",
Text = "",
};
}
var stepikBlock = await ConvertUlearnNonTextBlockIntoStepikStepBlock(
block, previousTextBlock, courseId, slide, stepikLessonId, options, results
).ConfigureAwait(false);
if (stepikBlock != null)
{
stepikBlocks.Add(stepikBlock);
}
}
}
if (!string.IsNullOrEmpty(previousTextBlock.Text) && !attachTextBlocksToInteractiveContent)
{
stepikBlocks.Add(previousTextBlock);
}
return(stepikBlocks);
}
private async Task RemoveStepsFromLesson(StepikApiLesson lesson, List <int> removeStepsIds, CourseExportResults results)
{
var realStepsIds = lesson.StepsIds;
var newPosition = 0;
foreach (var stepId in realStepsIds)
{
if (removeStepsIds.Contains(stepId))
{
try
{
await client.DeleteStep(stepId).ConfigureAwait(false);
}
catch (StepikApiException e)
{
results.Error("Can't delete step: " + e.Message);
}
}
else
{
try
{
await client.MoveStep(stepId, newPosition + 1).ConfigureAwait(false);
// Increment newPosition only if success
newPosition++;
}
catch (StepikApiException e)
{
results.Error("Can't move step: " + e.Message);
}
}
}
}
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);
}
}
private async Task <int> InsertSlideAsStepsInLesson(Course course, Slide slide, int stepikLessonId, int position, CourseExportOptions options, CourseExportResults results)
{
var stepikBlocks = (await ConvertUlearnBlocksIntoStepikBlocks(course.Id, slide, slide.Blocks, options, stepikLessonId, results).ConfigureAwait(false)).ToList();
var blocksCountToInsert = stepikBlocks.Count;
await MoveStepsForSpaceEmpting(stepikLessonId, position, blocksCountToInsert).ConfigureAwait(false);
foreach (var stepikBlock in stepikBlocks)
{
/* Stepik has no step's titles so insert slide title in each step as H1 */
stepikBlock.Text = $"<h1>{slide.Title.EscapeHtml()}</h1>" + (stepikBlock.Text ?? "");
var uploadedStep = await client.UploadStep(new StepikApiStepSource
{
Block = stepikBlock,
Position = ++position,
LessonId = stepikLessonId,
Cost = stepikBlock.Cost,
}).ConfigureAwait(false);
if (!uploadedStep.Id.HasValue)
{
throw new StepikApiException("Didn't receive `step`'s ID from stepik");
}
results.SlideIdToStepsIdsMap[slide.Id].Add(uploadedStep.Id.Value);
}
return(blocksCountToInsert);
}
private async Task TryInitialExportCourse(Course course, CourseInitialExportOptions exportOptions, CourseExportResults results)
{
var stepikCourse = await client.GetCourse(exportOptions.StepikCourseId).ConfigureAwait(false);
results.StepikCourseTitle = stepikCourse.Title;
await ClearCourse(stepikCourse).ConfigureAwait(false);
var unitIndex = 0;
foreach (var unit in course.Units)
{
results.Info($"Converting ulearn unit «{unit.Title}» into stepik section");
var section = ConvertUlearnUnitIntoStepikSection(unit);
section.CourseId = exportOptions.StepikCourseId;
section.Position = ++unitIndex;
section = await client.UploadSection(section).ConfigureAwait(false);
if (!section.Id.HasValue)
{
throw new StepikApiException($"Didn't receive `section`'s ID from stepik: {section.JsonSerialize()}");
}
var currentStepikLessonId = -1;
var blockIndex = 0;
var lessonIndex = 0;
var isFirstSlideInUnit = true;
foreach (var slide in unit.Slides)
{
results.Info($"Converting ulearn slide «{slide.Title}» with id {slide.Id} into stepik steps");
var needToStartNewLesson = isFirstSlideInUnit || exportOptions.SlideIdsWhereNewLessonsStart.Contains(slide.Id);
isFirstSlideInUnit = false;
if (needToStartNewLesson)
{
results.Info("Starting new stepik lesson for this slide");
var lesson = await client.UploadLesson(new StepikApiLesson
{
Title = slide.Title
}).ConfigureAwait(false);
if (!lesson.Id.HasValue)
{
throw new StepikApiException($"Didn't receive `lesson`'s ID from stepik: {lesson.JsonSerialize()}");
}
currentStepikLessonId = lesson.Id.Value;
await client.UploadUnit(new StepikApiUnit
{
Position = ++lessonIndex,
SectionId = section.Id.Value,
LessonId = currentStepikLessonId,
}).ConfigureAwait(false);
blockIndex = 0;
}
blockIndex += await InsertSlideAsStepsInLesson(course, slide, currentStepikLessonId, blockIndex, exportOptions, results).ConfigureAwait(false);
}
}
}