added working excel export

SurveyLib.Tools/Tools/TableExporter.cs

@@ -8,27 +8,33 @@ public class TableExporter : IDataExporter
 {
     private readonly ISurveyService _surveyService;
     private readonly IQuestionService _questionService;
+    private readonly ICompletionService _completionService;
+    private readonly IAnswerService _answerService;
 
-    public TableExporter(ISurveyService surveyService, IQuestionService questionService)
+    public TableExporter(ISurveyService surveyService, IQuestionService questionService,
+        ICompletionService completionService, IAnswerService answerService)
     {
         _surveyService = surveyService;
         _questionService = questionService;
+        _completionService = completionService;
+        _answerService = answerService;
     }
 
     public async Task<byte[]> ExportDataBySurveyIdAsync(int surveyId)
     {
         var survey = await _surveyService.GetSurveyAsync(surveyId);
         var questions = await _questionService.GetQuestionsBySurveyIdAsync(surveyId);
+        var completions = await _completionService.GetCompletionsBySurveyIdAsync(surveyId);
 
         using var workbook = new XLWorkbook();
-        var ws = workbook.Worksheets.Add("Sheet1");
+        var ws = workbook.Worksheets.Add(survey.Title);
         ws.Cell(1, 1).Value = "Title";
         ws.Cell(1, 2).Value = survey.Title;
 
         ws.Cell(2, 1).Value = "Description";
         ws.Cell(2, 2).Value = survey.Description;
 
-        ws.Cell(3, 1).Value = "Created At";
+        ws.Cell(3, 1).Value = "Export issued at";
         ws.Cell(3, 2).Value = DateTime.UtcNow;
 
         ws.Cell(4, 1).Value = "Completed By";
@@ -41,6 +47,25 @@ public class TableExporter : IDataExporter
             column++;
         }
 
+        var row = 5;
+        foreach (var completion in completions)
+        {
+            ws.Cell(row, 1).Value = completion.CompletedBy?.ToString() ?? "Unknown";
+            ws.Cell(row, 2).Value = completion.FinishedAt;
+            column = 3;
+            var answers = await _answerService.GetAnswersByCompletionIdAsync(completion.Id);
+            var answersGroupedByQuestion = answers.GroupBy(a => a.QuestionId);
+            foreach (var questionAnswers in answersGroupedByQuestion)
+            {
+                ws.Cell(row, column).Value = string.Join("; ", questionAnswers.Select(a => a.AnswerText));
+                column++;
+            }
+
+            row++;
+        }
+
+        ws.Columns().AdjustToContents();
+
         using var stream = new MemoryStream();
         workbook.SaveAs(stream);
         return stream.ToArray();