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 static bool IsCurrentBlockText(SlideBlock block, CourseExportOptions options)
{
return(block is MarkdownBlock || block is CodeBlock || (options.VideoUploadOptions == UploadVideoToStepikOption.Iframe && block is YoutubeBlock));
}
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);
}