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import { InjectModel } from '@nestjs/mongoose';
import { Model, Types } from 'mongoose';
import {
LearningConfiguration,
LearningCatalog,
LearningCategory,
Course,
CourseVersion,
CourseModule,
CourseLesson,
CourseEnrolment,
LearnerCourseProgress,
AssessmentQuestionBank,
AssessmentQuestion,
LearningAssessment,
AssessmentAttempt,
EmployeeCertification,
ComplianceTrainingDefinition,
ComplianceWaiver,
LearningBadge,
LearnerPoint
} from './schemas';
import { EventBusService } from '../../platform/events/event-bus.service';
@Injectable()
export class LearningService {
constructor(
@InjectModel(LearningConfiguration.name) private configModel: Model<LearningConfiguration>,
@InjectModel(LearningCatalog.name) private catalogModel: Model<LearningCatalog>,
@InjectModel(LearningCategory.name) private categoryModel: Model<LearningCategory>,
@InjectModel(Course.name) private courseModel: Model<Course>,
@InjectModel(CourseVersion.name) private courseVersionModel: Model<CourseVersion>,
@InjectModel(CourseModule.name) private moduleModel: Model<CourseModule>,
@InjectModel(CourseLesson.name) private lessonModel: Model<CourseLesson>,
@InjectModel(CourseEnrolment.name) private enrolmentModel: Model<CourseEnrolment>,
@InjectModel(LearnerCourseProgress.name) private progressModel: Model<LearnerCourseProgress>,
@InjectModel(AssessmentQuestionBank.name) private questionBankModel: Model<AssessmentQuestionBank>,
@InjectModel(AssessmentQuestion.name) private questionModel: Model<AssessmentQuestion>,
@InjectModel(LearningAssessment.name) private assessmentModel: Model<LearningAssessment>,
@InjectModel(AssessmentAttempt.name) private attemptModel: Model<AssessmentAttempt>,
@InjectModel(EmployeeCertification.name) private certificationModel: Model<EmployeeCertification>,
@InjectModel(ComplianceTrainingDefinition.name) private complianceModel: Model<ComplianceTrainingDefinition>,
@InjectModel(ComplianceWaiver.name) private waiverModel: Model<ComplianceWaiver>,
@InjectModel(LearningBadge.name) private badgeModel: Model<LearningBadge>,
@InjectModel(LearnerPoint.name) private pointModel: Model<LearnerPoint>,
private readonly eventBus: EventBusService
) {}
// ----------------------------------------------------
// 1. Enrolment Engine
// ----------------------------------------------------
async enrolInCourse(
tenantId: string,
employeeId: string,
courseId: string,
source: string = 'self'
): Promise<CourseEnrolment> {
const tenantObjId = new Types.ObjectId(tenantId);
const employeeObjId = new Types.ObjectId(employeeId);
const courseObjId = new Types.ObjectId(courseId);
// Verify course exists
const course = await this.courseModel.findOne({ _id: courseObjId, tenantId: tenantObjId }).exec();
Iif (!course) throw new BadRequestException('Course not found');
// Prevent duplicate enrolments
const existing = await this.enrolmentModel.findOne({
tenantId: tenantObjId,
employeeId: employeeObjId,
courseId: courseObjId
}).exec();
if (existing) {
return existing; // idempotent check
}
const enrolment = new this.enrolmentModel({
tenantId: tenantObjId,
employeeId: employeeObjId,
courseId: courseObjId,
status: 'enrolled',
enrolmentSource: source,
enrolmentDate: new Date(),
deadline: new Date(Date.now() + (course.validityDays || 365) * 24 * 60 * 60 * 1000)
});
const savedEnrolment = await enrolment.save();
// Create associated progress entry
const progress = new this.progressModel({
tenantId: tenantObjId,
enrolmentId: savedEnrolment._id,
courseId: courseObjId,
employeeId: employeeObjId,
completionPercentage: 0,
completedLessons: [],
lessonTimeSpentSeconds: {},
lastMediaPlaybackPositions: {},
lastAccessedAt: new Date()
});
await progress.save();
// Publish event via transactional outbox
await this.eventBus.publish(
'learning.enrolment.created.v1',
{
enrolmentId: savedEnrolment._id.toString(),
employeeId: employeeId,
courseId: courseId,
source
},
tenantId
);
return savedEnrolment;
}
// ----------------------------------------------------
// 2. Learner Progress Engine
// ----------------------------------------------------
async recordLessonProgress(
tenantId: string,
employeeId: string,
courseId: string,
lessonId: string,
timeSpentSeconds: number,
playbackPosition?: number
): Promise<LearnerCourseProgress> {
const tenantObjId = new Types.ObjectId(tenantId);
const employeeObjId = new Types.ObjectId(employeeId);
const courseObjId = new Types.ObjectId(courseId);
const lessonObjId = new Types.ObjectId(lessonId);
const progress = await this.progressModel.findOne({
tenantId: tenantObjId,
employeeId: employeeObjId,
courseId: courseObjId
}).exec();
Iif (!progress) throw new BadRequestException('Enrolment progress record not found');
// Update lesson time spent safely
const times = progress.lessonTimeSpentSeconds || {};
times[lessonId] = (times[lessonId] || 0) + timeSpentSeconds;
progress.lessonTimeSpentSeconds = times;
Eif (playbackPosition !== undefined) {
const positions = progress.lastMediaPlaybackPositions || {};
positions[lessonId] = playbackPosition;
progress.lastMediaPlaybackPositions = positions;
}
// Toggle completed status if not already completed
Eif (!progress.completedLessons.includes(lessonObjId)) {
progress.completedLessons.push(lessonObjId);
// Find total lessons in the modules to rollup completion percentage
const modules = await this.moduleModel.find({ tenantId: tenantObjId, courseId: courseObjId }).exec();
const moduleIds = modules.map(m => m._id);
const totalLessonsCount = await this.lessonModel.countDocuments({
tenantId: tenantObjId,
moduleId: { $in: moduleIds }
}).exec();
if (totalLessonsCount > 0) {
progress.completionPercentage = Math.round(
(progress.completedLessons.length / totalLessonsCount) * 100
);
} else E{
progress.completionPercentage = 100;
}
}
progress.lastAccessedAt = new Date();
progress.markModified('lessonTimeSpentSeconds');
progress.markModified('lastMediaPlaybackPositions');
const savedProgress = await progress.save();
// Check if course completed
Iif (savedProgress.completionPercentage >= 100) {
await this.completeCourseEnrolment(tenantId, employeeId, courseId);
}
return savedProgress;
}
private async completeCourseEnrolment(tenantId: string, employeeId: string, courseId: string): Promise<void> {
const tenantObjId = new Types.ObjectId(tenantId);
const employeeObjId = new Types.ObjectId(employeeId);
const courseObjId = new Types.ObjectId(courseId);
const enrolment = await this.enrolmentModel.findOne({
tenantId: tenantObjId,
employeeId: employeeObjId,
courseId: courseObjId
}).exec();
Eif (enrolment && enrolment.status !== 'completed') {
enrolment.status = 'completed';
enrolment.completionDate = new Date();
await enrolment.save();
// Issue Certificate if enabled
const course = await this.courseModel.findById(courseObjId).exec();
Iif (course && course.certificateEnabled) {
await this.generateCertificate(tenantId, employeeId, courseId);
}
// Award Gamification Points
await this.awardPoints(tenantId, employeeId, 100);
// Publish event
await this.eventBus.publish(
'learning.course.completed.v1',
{
enrolmentId: enrolment._id.toString(),
employeeId: employeeId,
courseId: courseId
},
tenantId
);
}
}
// ----------------------------------------------------
// 3. Quiz & Assessment Evaluator
// ----------------------------------------------------
async gradeAssessmentAttempt(
tenantId: string,
employeeId: string,
assessmentId: string,
answersSubmitted: Record<string, number[]>
): Promise<AssessmentAttempt> {
const tenantObjId = new Types.ObjectId(tenantId);
const employeeObjId = new Types.ObjectId(employeeId);
const assessmentObjId = new Types.ObjectId(assessmentId);
const assessment = await this.assessmentModel.findById(assessmentObjId).populate('questionsList').exec();
Iif (!assessment) throw new BadRequestException('Assessment profile not found');
let totalPoints = 0;
let earnedPoints = 0;
const questions = assessment.questionsList as unknown as AssessmentQuestion[];
for (const q of questions) {
totalPoints += q.points || 10;
const submitted = answersSubmitted[q._id.toString()];
Eif (submitted) {
// Enforce exact matching correct indexes
const correct = q.correctOptionIndexes || [];
const isCorrect =
submitted.length === correct.length &&
submitted.every(idx => correct.includes(idx));
Eif (isCorrect) {
earnedPoints += q.points || 10;
}
}
}
const scorePct = totalPoints > 0 ? Math.round((earnedPoints / totalPoints) * 100) : 0;
const passed = scorePct >= (assessment.passingScorePercentage || 80);
const attempt = new this.attemptModel({
tenantId: tenantObjId,
assessmentId: assessmentObjId,
employeeId: employeeObjId,
answersSubmitted,
scorePercentage: scorePct,
passed,
status: 'completed'
});
const savedAttempt = await attempt.save();
// Trigger complete course if assessment is passed and enrolment is active
if (passed) {
await this.completeCourseEnrolment(tenantId, employeeId, assessment.courseId.toString());
// Publish event
await this.eventBus.publish(
'learning.assessment.completed.v1',
{
attemptId: savedAttempt._id.toString(),
employeeId,
assessmentId,
scorePercentage: scorePct
},
tenantId
);
} else E{
await this.eventBus.publish(
'learning.assessment.failed.v1',
{
attemptId: savedAttempt._id.toString(),
employeeId,
assessmentId,
scorePercentage: scorePct
},
tenantId
);
}
return savedAttempt;
}
// ----------------------------------------------------
// 4. Certification Engine
// ----------------------------------------------------
async generateCertificate(
tenantId: string,
employeeId: string,
courseId: string
): Promise<EmployeeCertification> {
const tenantObjId = new Types.ObjectId(tenantId);
const employeeObjId = new Types.ObjectId(employeeId);
const courseObjId = new Types.ObjectId(courseId);
const course = await this.courseModel.findById(courseObjId).exec();
if (!course) throw new BadRequestException('Course not found');
const token = `verify_${tenantId}_${employeeId}_${courseId}_${Date.now()}`;
const cert = new this.certificationModel({
tenantId: tenantObjId,
employeeId: employeeObjId,
courseId: courseObjId,
certificateName: `${course.title} - Professional Certificate`,
verificationToken: token,
issuedAt: new Date(),
expiresAt: new Date(Date.now() + (course.validityDays || 365) * 24 * 60 * 60 * 1000),
status: 'active'
});
const savedCert = await cert.save();
await this.eventBus.publish(
'learning.certification.issued.v1',
{
certificateId: savedCert._id.toString(),
employeeId,
verificationToken: token
},
tenantId
);
return savedCert;
}
async verifyPublicCertificate(token: string): Promise<EmployeeCertification | null> {
return this.certificationModel.findOne({ verificationToken: token, status: 'active' }).exec();
}
// ----------------------------------------------------
// 5. Gamification Rewards
// ----------------------------------------------------
async awardPoints(tenantId: string, employeeId: string, pts: number): Promise<LearnerPoint> {
const tenantObjId = new Types.ObjectId(tenantId);
const employeeObjId = new Types.ObjectId(employeeId);
let rec = await this.pointModel.findOne({ tenantId: tenantObjId, employeeId: employeeObjId }).exec();
Eif (!rec) {
rec = new this.pointModel({
tenantId: tenantObjId,
employeeId: employeeObjId,
pointsBalance: 0,
currentStreakDays: 1
});
}
rec.pointsBalance += pts;
return rec.save();
}
// ----------------------------------------------------
// 6. Security Media Signatures
// ----------------------------------------------------
async getSecureContentUrl(tenantId: string, fileKey: string): Promise<string> {
// Generate secure expiring signature. Never expose raw local VPS file paths directly.
const expires = Date.now() + 15 * 60 * 1000; // 15 mins expiry
return `https://vps-storage.bevision.internal/files/${fileKey}?tenantId=${tenantId}&expires=${expires}&signature=sha256_mock_sig`;
}
}
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