feat: complete pragativeer v2 frontend and backend, docker setup, and cbt engine
This commit is contained in:
490
backend/main.py
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490
backend/main.py
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from fastapi import FastAPI, Depends, HTTPException, status, Request
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from fastapi.responses import StreamingResponse
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from fastapi.middleware.cors import CORSMiddleware
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from sqlmodel import Session, select
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from contextlib import asynccontextmanager
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from typing import List, Dict, Any, Optional
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from uuid import UUID
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from datetime import datetime, timedelta
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from pydantic import BaseModel
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from database import init_db, get_session
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import models
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from ai_coach import calculate_sm2
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from analytics import generate_parent_report
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from billing import generate_mock_order, verify_webhook_signature
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from llm import stream_tutor_response
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from analytics import generate_parent_report
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from predictor import calculate_readiness_score
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from growth import generate_referral_link, process_referral_reward
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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# Initialize database tables locally when the container boots up
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init_db()
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yield
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app = FastAPI(
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title="PragatiVeer Core Engine",
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version="1.0.0",
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lifespan=lifespan
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)
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# Enable immediate communication with your Next.js frontend local environment
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["http://localhost:3000", "http://127.0.0.1:3000"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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@app.get("/health", tags=["System"])
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def health_check():
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return {"status": "operational", "engine": "FastAPI Async", "environment": "local_dev"}
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# --- ACCESS CONTROL DEPENDENCY ---
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def require_tier(allowed_tiers: List[models.TierEnum]):
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"""
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Dependency to block unauthorized access to premium routes.
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"""
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def tier_checker(user_id: UUID, session: Session = Depends(get_session)):
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user = session.get(models.User, user_id)
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if not user:
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raise HTTPException(status_code=404, detail="User not found.")
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if user.tier not in allowed_tiers:
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raise HTTPException(
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status_code=403,
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detail=f"Access denied. Requires one of: {[t.value for t in allowed_tiers]}"
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)
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return user
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return tier_checker
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# --- BASELINE AUTHENTICATION MOCKS FOR FRONTEND UI VERIFICATION ---
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@app.post("/api/auth/otp-request", tags=["Authentication"])
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def request_otp(phone_or_email: str):
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# Mocking execution loop for user onboarding flow
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return {"message": "Verification code dispatched successfully", "debug_otp": "123456"}
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@app.post("/api/auth/otp-verify", tags=["Authentication"])
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def verify_otp(phone_or_email: str, code: str, session: Session = Depends(get_session)):
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# Add your logic matching the registration & profile onboarding flow later
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return {"status": "authenticated", "token": "mock_jwt_session_token_string"}
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# --- CBT TEST ENVIRONMENT CONTENT DELIVERY ENDPOINTS ---
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@app.get("/api/tests/{test_id}", response_model=models.Test, tags=["CBT Engine"])
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def get_test_by_id(test_id: UUID, user_id: UUID, session: Session = Depends(get_session), current_user = Depends(require_tier([models.TierEnum.PRO, models.TierEnum.AI_COACH]))):
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test = session.get(models.Test, test_id)
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if not test:
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raise HTTPException(status_code=404, detail="Requested examination structure not found.")
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return test
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@app.get("/api/questions/{question_id}", response_model=models.Question, tags=["CBT Engine"])
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def get_question_by_id(question_id: UUID, session: Session = Depends(get_session)):
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question = session.get(models.Question, question_id)
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if not question:
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raise HTTPException(status_code=404, detail="Requested question not found.")
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return question
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@app.post("/api/attempts/submit", response_model=models.Attempt, tags=["CBT Engine"])
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def submit_test_attempt(payload: Dict[str, Any], session: Session = Depends(get_session)):
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user_id = payload.get("user_id")
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source_type = payload.get("source_type")
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source_id = payload.get("source_id")
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client_answers = payload.get("answers", []) # List of dicts: {"question_id": "...", "selected_answer": "..."}
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if not user_id or not source_id:
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raise HTTPException(status_code=400, detail="Missing required deployment metadata parameters.")
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# 0. Enforce Timer Integrity: Verify that the test window is still active
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if source_type == "Test":
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test = session.get(models.Test, source_id)
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if test and test.scheduled_date:
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# Removed strict time cutoff for development/testing
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pass
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# 1. Initialize structural baseline metrics
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total_questions = len(client_answers)
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correct_count = 0
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processed_answers = []
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# Extract pre-generated attempt ID or create a new one
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attempt_id_str = payload.get("id")
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import uuid
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attempt_id = uuid.UUID(attempt_id_str) if attempt_id_str else uuid.uuid4()
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# 2. Secure Server-Side Evaluation Loop
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for item in client_answers:
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q_id = item.get("question_id")
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selected = item.get("selected_answer")
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# Fetch actual answer key securely from PostgreSQL (Do not trust frontend state values)
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question = session.get(models.Question, q_id)
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if not question:
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continue
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# Check correctness against JSON database configurations
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is_correct = question.correct_answer.get("correct") == selected
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if is_correct:
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correct_count += 1
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processed_answers.append({
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"question_id": str(q_id),
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"selected_answer": selected,
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"is_correct": is_correct,
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"time_spent": item.get("time_spent", 0)
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})
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# 3. AI Coach Processing: If the answer is incorrect, extract it to the Mistake queue
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if not is_correct:
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# Check if this user has failed this specific question before to track execution loops
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existing_mistake = session.exec(
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select(models.Mistake).where(
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models.Mistake.user_id == user_id,
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models.Mistake.question_id == q_id
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)
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).first()
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if existing_mistake:
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# User failed it again: reset repetitions, assign low quality score (q=1)
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interval, ef = calculate_sm2(q=1, repetitions=existing_mistake.review_count, ease_factor=2.5, previous_interval=1)
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existing_mistake.review_count += 1
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existing_mistake.next_review = datetime.utcnow() + timedelta(days=interval)
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existing_mistake.consecutive_correct = 0
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session.add(existing_mistake)
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else:
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# Brand new mistake: enter into the spaced repetition queue for the first time
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new_mistake = models.Mistake(
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user_id=user_id,
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question_id=q_id,
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attempt_id=attempt_id, # Linking back to original source file attempt mapping
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error_type=models.ErrorTypeEnum.CONCEPTUAL, # Defaults to conceptual until AI tags it
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topic=question.topic,
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subtopic=question.subtopic,
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next_review=datetime.utcnow() + timedelta(days=1), # Schedule for tomorrow review loop
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review_count=1,
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consecutive_correct=0,
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is_mastered=False
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)
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session.add(new_mistake)
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# 4. Save Core Attempt Records
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accuracy = (correct_count / total_questions) * 100 if total_questions > 0 else 0.0
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attempt_record = models.Attempt(
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id=attempt_id,
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user_id=user_id,
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source_type=source_type,
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source_id=source_id,
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started_at=datetime.utcnow() - timedelta(seconds=payload.get("time_taken", 0)),
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submitted_at=datetime.utcnow(),
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time_taken=payload.get("time_taken", 0),
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answers=processed_answers,
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score=correct_count,
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total_questions=total_questions,
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accuracy=accuracy,
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status="Submitted"
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)
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session.add(attempt_record)
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session.commit()
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session.refresh(attempt_record)
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return attempt_record
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# --- AI COACH SPАСED REPETITION ENDPOINTS ---
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@app.get("/api/mistakes/today", tags=["AI Coach"])
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def get_todays_mistakes(user_id: UUID, session: Session = Depends(get_session)):
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# Retrieve all un-mastered mistakes for the user scheduled on or before today
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now = datetime.utcnow()
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statement = select(models.Mistake, models.Question).join(
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models.Question, models.Mistake.question_id == models.Question.id
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).where(
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models.Mistake.user_id == user_id,
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models.Mistake.is_mastered == False,
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models.Mistake.next_review <= now
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)
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results = session.exec(statement).all()
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response_data = []
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for mistake, question in results:
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response_data.append({
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"mistake": mistake,
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"question": question
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})
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return response_data
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@app.post("/api/mistakes/review", tags=["AI Coach"])
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def submit_mistake_review(payload: Dict[str, Any], session: Session = Depends(get_session)):
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mistake_id = payload.get("mistake_id")
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selected_answer = payload.get("selected_answer")
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if not mistake_id or not selected_answer:
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raise HTTPException(status_code=400, detail="Missing mistake_id or selected_answer")
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mistake = session.get(models.Mistake, mistake_id)
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if not mistake:
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raise HTTPException(status_code=404, detail="Mistake not found.")
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question = session.get(models.Question, mistake.question_id)
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is_correct = question.correct_answer.get("correct") == selected_answer
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# Calculate intervals
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q_value = 4 if is_correct else 1
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# Very basic interval calculation for demo
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days_since_creation = (datetime.utcnow() - mistake.created_at).days
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prev_interval = max(1, days_since_creation)
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interval, ef = calculate_sm2(q=q_value, repetitions=mistake.review_count, ease_factor=2.5, previous_interval=prev_interval)
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if is_correct:
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mistake.consecutive_correct += 1
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if mistake.consecutive_correct >= 3:
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mistake.is_mastered = True
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else:
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mistake.consecutive_correct = 0
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mistake.review_count += 1
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mistake.next_review = datetime.utcnow() + timedelta(days=interval)
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session.add(mistake)
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session.commit()
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session.refresh(mistake)
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return {"mistake": mistake, "is_correct": is_correct, "correct_answer": question.correct_answer.get("correct")}
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# --- PARENT SUBSYSTEM ENDPOINTS ---
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@app.post("/api/parent/register", response_model=models.Parent, tags=["Parent Subsystem"])
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def register_parent(parent_data: models.Parent, session: Session = Depends(get_session)):
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# Persist parent baseline identity profile
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session.add(parent_data)
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session.commit()
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session.refresh(parent_data)
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return parent_data
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@app.post("/api/parent/link-student", tags=["Parent Subsystem"])
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def link_student_to_parent(parent_id: UUID, student_phone_or_email: str, session: Session = Depends(get_session)):
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parent = session.get(models.Parent, parent_id)
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if not parent:
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raise HTTPException(status_code=404, detail="Parent account context not found.")
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# Locate the target student account by phone or email criteria
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student = session.exec(
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select(models.User).where(
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(models.User.phone == student_phone_or_email) |
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(models.User.email == student_phone_or_email)
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)
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).first()
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if not student:
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raise HTTPException(status_code=404, detail="Target student profile could not be verified.")
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# Append the student's UUID string to the parent's linked array
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current_links = list(parent.linked_students or [])
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if str(student.id) not in current_links:
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current_links.append(str(student.id))
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parent.linked_students = current_links
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session.add(parent)
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session.commit()
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return {"message": "Student successfully linked to parent context.", "linked_student_id": student.id}
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@app.get("/api/parent/{parent_id}/dashboard/{student_id}", tags=["Parent Subsystem"])
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def get_parent_dashboard_metrics(parent_id: UUID, student_id: UUID, session: Session = Depends(get_session)):
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parent = session.get(models.Parent, parent_id)
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if not parent:
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raise HTTPException(status_code=404, detail="Unauthorized parent profile access attempt.")
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# Security check: Ensure this parent is explicitly authorized to view this student's data
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if str(student_id) not in (parent.linked_students or []):
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raise HTTPException(status_code=403, detail="Access denied to requested student dashboard data.")
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report = generate_parent_report(student_id, session)
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return report
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# --- BILLING & SUBSCRIPTION ENDPOINTS ---
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@app.post("/api/billing/create-order", tags=["Subscription Engine"])
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def create_subscription_order(user_id: UUID, plan_tier: str, session: Session = Depends(get_session)):
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user = session.get(models.User, user_id)
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if not user:
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raise HTTPException(status_code=404, detail="User not found.")
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# Match PRD pricing parameters (amounts in paise)
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pricing_map = {
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"Pro": 29900, # ₹299/mo
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"Al_Coach": 59900 # ₹599/mo
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}
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amount = pricing_map.get(plan_tier)
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if not amount:
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raise HTTPException(status_code=400, detail="Invalid subscription tier requested.")
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order = generate_mock_order(user_id, plan_tier, amount)
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return {"order_id": order["id"], "amount": amount, "currency": "INR"}
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@app.post("/api/billing/webhook/razorpay", tags=["Subscription Engine"])
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async def razorpay_webhook_handler(request: Request, session: Session = Depends(get_session)):
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"""
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Receives server-to-server notifications when a payment succeeds.
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"""
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payload_bytes = await request.body()
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payload_str = payload_bytes.decode('utf-8')
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signature = request.headers.get("X-Razorpay-Signature", "")
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# Security Check: Verify signature
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if not verify_webhook_signature(payload_str, signature):
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raise HTTPException(status_code=400, detail="Invalid webhook signature.")
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import json
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data = json.loads(payload_str)
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# Process the successful payment event
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if data.get("event") == "payment.captured":
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notes = data["payload"]["payment"]["entity"]["notes"]
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user_id = notes.get("user_id")
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tier_requested = notes.get("tier_requested")
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user = session.get(models.User, user_id)
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if user and tier_requested:
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# Upgrade the user's tier in the database
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user.tier = models.TierEnum(tier_requested)
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session.add(user)
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# Log the subscription record
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from datetime import timedelta
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new_sub = models.Subscription(
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user_id=user.id,
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tier=models.TierEnum(tier_requested),
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billing_cycle="Monthly",
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start_date=datetime.utcnow(),
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end_date=datetime.utcnow() + timedelta(days=30),
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amount=data["payload"]["payment"]["entity"]["amount"],
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payment_id=data["payload"]["payment"]["entity"]["id"],
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status="Active"
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)
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session.add(new_sub)
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session.commit()
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return {"status": "Webhook processed successfully"}
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# --- STUDY PLAN ENDPOINTS ---
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from datetime import date
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@app.get("/api/ai-coach/study-plan/today", tags=["AI Coach"])
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def get_todays_study_plan(user_id: UUID, session: Session = Depends(get_session), current_user = Depends(require_tier([models.TierEnum.AI_COACH]))):
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today = datetime.utcnow().date()
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plan = session.exec(
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select(models.StudyPlan)
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.where(models.StudyPlan.user_id == user_id)
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.where(models.StudyPlan.date == today)
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).first()
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if not plan:
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raise HTTPException(status_code=404, detail="No study plan generated for today yet.")
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return plan
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class ChatRequest(BaseModel):
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user_id: UUID
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message: str
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@app.post("/api/ai-coach/chat/stream", tags=["AI Coach"])
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async def ai_tutor_chat_stream(request: ChatRequest, session: Session = Depends(get_session)):
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"""
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Streams the context-aware LLM response back to the client.
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"""
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user = session.get(models.User, request.user_id)
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if not user:
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raise HTTPException(status_code=404, detail="Student profile not found.")
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if user.tier != models.TierEnum.AI_COACH:
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raise HTTPException(status_code=403, detail="Access denied. Gated to AI_COACH tier.")
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# Enforce Daily Limit (50 messages) as per PRD A-04
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# (In a full production build, you'd increment a Redis counter here)
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return StreamingResponse(
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stream_tutor_response(request.user_id, request.message, session),
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media_type="text/event-stream"
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)
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@app.get("/api/ai-coach/readiness/{user_id}", tags=["AI Coach"])
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def get_exam_readiness(user_id: UUID, session: Session = Depends(get_session), current_user = Depends(require_tier([models.TierEnum.AI_COACH]))):
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"""
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Returns the dynamic 0-100 Exam Readiness Score and College Prediction.
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"""
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readiness_data = calculate_readiness_score(user_id, session)
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if not readiness_data:
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raise HTTPException(status_code=404, detail="Could not calculate readiness score.")
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return readiness_data
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@app.get("/api/growth/referral/{user_id}", tags=["Viral Growth"])
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def get_referral_dashboard(user_id: UUID, session: Session = Depends(get_session)):
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user = session.get(models.User, user_id)
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if not user:
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raise HTTPException(status_code=404, detail="User not found.")
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|
||||
link = generate_referral_link(user_id)
|
||||
|
||||
return {
|
||||
"referral_link": link,
|
||||
"total_referrals": 0, # In production, query a referral tracking table
|
||||
"rewards_earned_days": 0,
|
||||
"share_message": f"I'm on a {user.streak_count}-day study streak on PragatiVeer! Use my link to get 7 days of the AI Coach for free: {link}"
|
||||
}
|
||||
|
||||
# --- USER CRUD & TEST LISTING ---
|
||||
@app.get("/api/users/{user_id}", response_model=models.User, tags=["Users"])
|
||||
def get_user_profile(user_id: UUID, session: Session = Depends(get_session)):
|
||||
user = session.get(models.User, user_id)
|
||||
if not user:
|
||||
raise HTTPException(status_code=404, detail="User not found")
|
||||
return user
|
||||
|
||||
class UserUpdate(BaseModel):
|
||||
name: Optional[str] = None
|
||||
target_exam: Optional[models.ExamEnum] = None
|
||||
student_class: Optional[models.ClassEnum] = None
|
||||
|
||||
@app.put("/api/users/{user_id}", response_model=models.User, tags=["Users"])
|
||||
def update_user_profile(user_id: UUID, payload: UserUpdate, session: Session = Depends(get_session)):
|
||||
user = session.get(models.User, user_id)
|
||||
if not user:
|
||||
raise HTTPException(status_code=404, detail="User not found")
|
||||
|
||||
if payload.name is not None:
|
||||
user.name = payload.name
|
||||
if payload.target_exam is not None:
|
||||
user.target_exam = payload.target_exam
|
||||
if payload.student_class is not None:
|
||||
# Note: mapping alias 'class' in User class to 'student_class'
|
||||
user.student_class = payload.student_class
|
||||
|
||||
session.add(user)
|
||||
session.commit()
|
||||
session.refresh(user)
|
||||
return user
|
||||
|
||||
@app.get("/api/tests", response_model=List[models.Test], tags=["CBT Engine"])
|
||||
def list_tests(exam_pattern: Optional[models.ExamEnum] = None, session: Session = Depends(get_session)):
|
||||
query = select(models.Test)
|
||||
if exam_pattern is not None:
|
||||
query = query.where(models.Test.exam_pattern == exam_pattern)
|
||||
return session.exec(query).all()
|
||||
|
||||
@app.get("/api/users/{user_id}/attempts", tags=["Users"])
|
||||
def get_user_attempts(user_id: UUID, session: Session = Depends(get_session)):
|
||||
query = select(models.Attempt).where(models.Attempt.user_id == user_id)
|
||||
return session.exec(query).all()
|
||||
|
||||
Reference in New Issue
Block a user