move services to separate project

+ add GetByUserId methods to Survey

SurveyLib.Services/Services/SurveyService.cs

@@ -0,0 +1,51 @@
+using SurveyLib.Core.Models;
+using SurveyLib.Core.Repositories;
+using SurveyLib.Core.Services;
+
+namespace SurveyLib.Services.Services;
+
+public class SurveyService : ISurveyService
+{
+    private readonly ISurveyRepository _surveyRepository;
+
+    public SurveyService(ISurveyRepository surveyRepository)
+    {
+        _surveyRepository = surveyRepository;
+    }
+
+    public async Task AddSurveyAsync(Survey survey)
+    {
+        await _surveyRepository.AddAsync(survey);
+    }
+
+    public async Task UpdateSurveyAsync(Survey survey)
+    {
+        await _surveyRepository.UpdateAsync(survey);
+    }
+
+    public async Task DeleteSurveyAsync(int id)
+    {
+        var survey = await _surveyRepository.GetByIdAsync(id);
+        if (survey == null)
+        {
+            throw new NullReferenceException($"Survey with id: {id} was not found");
+        }
+
+        await _surveyRepository.DeleteAsync(survey);
+    }
+
+    public async Task<IEnumerable<Survey>> GetSurveysAsync()
+    {
+        return await _surveyRepository.GetAllAsync();
+    }
+
+    public async Task<Survey?> GetSurveyAsync(int id)
+    {
+        return await _surveyRepository.GetByIdAsync(id);
+    }
+
+    public async Task<IEnumerable<Survey>> GetSurveysByUserIdAsync(int userId)
+    {
+        return await _surveyRepository.GetSurveysByUserIdAsync(userId);
+    }
+}