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package com.stileeducation.markr.service;
import com.stileeducation.markr.dto.AggregateResponseDTO;
import com.stileeducation.markr.dto.ImportResponseDTO;
import com.stileeducation.markr.dto.MCQTestResultDTO;
import com.stileeducation.markr.dto.MCQTestResultsDTO;
import com.stileeducation.markr.entity.Student;
import com.stileeducation.markr.entity.Test;
import com.stileeducation.markr.entity.TestResult;
import com.stileeducation.markr.repository.TestResultRepository;
import org.apache.commons.math3.stat.descriptive.moment.StandardDeviation;
import org.apache.commons.math3.stat.descriptive.rank.Percentile;
import org.springframework.stereotype.Service;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.OptionalDouble;
@Service
public class TestResultsService {
public static final boolean IS_BIAS_CORRECTED = false;
private final TestResultRepository testResultRepository;
private final StudentService studentService;
private final TestService testService;
public TestResultsService(TestResultRepository testResultRepository, StudentService studentService, TestService testService) {
this.testResultRepository = testResultRepository;
this.studentService = studentService;
this.testService = testService;
}
private static double[] calculatePercentages(List<TestResult> results, double totalMarksAvailable) {
return results.stream()
.mapToDouble(result -> (double) result.getMarksAwarded() / totalMarksAvailable * 100)
.toArray();
}
public TestResult findOrCreateTestResult(Student student, Test test, Integer marksAwarded) {
Optional<TestResult> optionalTestResult = testResultRepository.findByStudentAndTest(student, test);
if (optionalTestResult.isPresent()) {
TestResult testResult = optionalTestResult.get();
if (marksAwarded > testResult.getMarksAwarded()) {
testResult.setMarksAwarded(marksAwarded);
testResult.setUpdated(true);
testResultRepository.save(testResult);
} else {
testResult.setUpdated(false);
}
return testResult;
} else {
TestResult testResult = new TestResult();
testResult.setStudent(student);
testResult.setTest(test);
testResult.setMarksAwarded(marksAwarded);
testResult.setCreated(true);
return testResultRepository.save(testResult);
}
}
public List<TestResult> findAllByTestId(String testId) {
return testResultRepository.findAllByTestId(testId);
}
public double calculateMeanOfTestResults(Test test, List<TestResult> results) {
double totalMarksAvailable = test.getMarksAvailable();
if (totalMarksAvailable <= 0) {
return 0.0;
}
OptionalDouble meanPercentage = Arrays.stream(calculatePercentages(results, totalMarksAvailable)).average();
return meanPercentage.orElse(0.0);
}
public double calculateMinOfTestResults(Test test, List<TestResult> results) {
double totalMarksAvailable = test.getMarksAvailable();
if (totalMarksAvailable <= 0) {
return 0.0;
}
OptionalDouble minPercentage = Arrays.stream(calculatePercentages(results, totalMarksAvailable)).min();
return minPercentage.orElse(0.0);
}
public double calculateMaxOfTestResults(Test test, List<TestResult> results) {
double totalMarksAvailable = test.getMarksAvailable();
if (totalMarksAvailable <= 0) {
return 0.0;
}
OptionalDouble maxPercentage = Arrays.stream(calculatePercentages(results, totalMarksAvailable)).max();
return maxPercentage.orElse(0.0);
}
public double calculateStandardDeviationOfTestResults(Test test, List<TestResult> results) {
double totalMarksAvailable = test.getMarksAvailable();
if (totalMarksAvailable <= 0) {
return 0.0;
}
StandardDeviation standardDeviation = new StandardDeviation(IS_BIAS_CORRECTED);
return standardDeviation.evaluate(calculatePercentages(results, totalMarksAvailable));
}
public double calculate25thPercentile(Test test, List<TestResult> results) {
double totalMarksAvailable = test.getMarksAvailable();
if (totalMarksAvailable <= 0) {
return 0.0;
}
return new Percentile().evaluate(calculatePercentages(results, totalMarksAvailable), 25.0);
}
public double calculate50thPercentile(Test test, List<TestResult> results) {
double totalMarksAvailable = test.getMarksAvailable();
if (totalMarksAvailable <= 0) {
return 0.0;
}
return new Percentile().evaluate(calculatePercentages(results, totalMarksAvailable), 50.0);
}
public double calculate75thPercentile(Test test, List<TestResult> results) {
double totalMarksAvailable = test.getMarksAvailable();
if (totalMarksAvailable <= 0) {
return 0.0;
}
double[] percentages = calculatePercentages(results, totalMarksAvailable);
return new Percentile().evaluate(percentages, 75.0);
}
public AggregateResponseDTO aggregateTestResults(String testId) {
AggregateResponseDTO aggregateResponseDTO = new AggregateResponseDTO();
testService.findTest(testId).ifPresent(test -> {
List<TestResult> testResults = findAllByTestId(testId);
if (!testResults.isEmpty()) {
populateAggregateResponse(aggregateResponseDTO, test, testResults);
}
});
return aggregateResponseDTO;
}
private void populateAggregateResponse(AggregateResponseDTO dto, Test test, List<TestResult> results) {
dto.setMean(calculateMeanOfTestResults(test, results));
dto.setStddev(calculateStandardDeviationOfTestResults(test, results));
dto.setMin(calculateMinOfTestResults(test, results));
dto.setMax(calculateMaxOfTestResults(test, results));
dto.setP25(calculate25thPercentile(test, results));
dto.setP50(calculate50thPercentile(test, results));
dto.setP75(calculate75thPercentile(test, results));
dto.setCount(results.size());
}
public ImportResponseDTO processTestResults(MCQTestResultsDTO testResults) {
ImportResponseDTO.ImportData importData = new ImportResponseDTO.ImportData();
boolean isValid = true;
for (MCQTestResultDTO mcqTestResult : testResults.getMcqTestResults()) {
try {
processTestResult(mcqTestResult, importData);
} catch (Exception e) {
isValid = false;
}
}
return createImportResponse(importData, isValid);
}
private void processTestResult(MCQTestResultDTO mcqTestResult, ImportResponseDTO.ImportData importData) {
Student student =
studentService
.findOrCreateStudent(
mcqTestResult.getFirstName(),
mcqTestResult.getLastName(),
mcqTestResult.getStudentNumber());
incrementIfTrue(student.isCreated(), importData::incrementTestResultsCreated);
incrementIfTrue(student.isUpdated(), importData::incrementTestResultsUpdated);
Test test =
testService
.findOrCreateTest(
mcqTestResult.getTestId(),
mcqTestResult.getSummaryMarks().getAvailable());
incrementIfTrue(test.isCreated(), importData::incrementTestResultsCreated);
incrementIfTrue(test.isUpdated(), importData::incrementTestResultsUpdated);
TestResult testResult =
findOrCreateTestResult(
student,
test,
mcqTestResult.getSummaryMarks().getObtained());
incrementIfTrue(testResult.isCreated(), importData::incrementTestResultsCreated);
incrementIfTrue(testResult.isUpdated(), importData::incrementTestResultsUpdated);
}
private void incrementIfTrue(boolean condition, Runnable action) {
if (condition) {
action.run();
}
}
private ImportResponseDTO createImportResponse(ImportResponseDTO.ImportData importData, boolean isValid) {
ImportResponseDTO response = new ImportResponseDTO();
response.setData(importData);
if (isValid) {
response.setStatus("success");
response.setMessage("Import operation completed successfully.");
} else {
response.setStatus("failure");
response.setMessage("Data was invalid or processing failed.");
}
return response;
}
}
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