miralabs-backend/ai-service/app/main.py

# --- Library Imports ---
from fastapi import Depends, FastAPI, Query, Security, UploadFile, WebSocket
from fastapi.exceptions import RequestValidationError
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from sqlalchemy.orm import Session
from starlette.exceptions import HTTPException

from app.routers import chat_router

from .services.background_services.customer_income_analytics import customer_income_analytics
from .services.background_services.update_form_data_in_db import update_db
from .services.doc_agent import analyse_quote, doc_upload, doc_upload_lo
from .services.helpers.db_helper import get_user_id, underwrite
from .services.quotation_analysis import quotation_upload
from .services.underwrite_agent import get_underwriting_remarks
from .services.websocket_streaming import general_info, loan_officer, start_streaming

# ---
# --- User Imports ---
from .utils.app_logger.exception_handlers import (
    http_exception_handler,
    request_validation_exception_handler,
    unhandled_exception_handler,
)
from .utils.app_logger.middleware import log_request_middleware
from .utils.celery.worker import celery_app
from .utils.database import get_db
from .utils.jwt import UnauthenticatedException, UnauthorizedException, VerifyToken
from .utils.redis.redis import redis

# ---

# initialize Constants
DOC_VERIFY_QUEUE = "doc_verify_queue"


# initialize  app
app = FastAPI()


# allow cors
origins = ["*"]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# initialize logger
app.middleware("http")(log_request_middleware)
app.add_exception_handler(RequestValidationError, request_validation_exception_handler)
app.add_exception_handler(HTTPException, http_exception_handler)
app.add_exception_handler(Exception, unhandled_exception_handler)


verify_token = VerifyToken()

# initialize base routes


@app.get("/", summary="Base Route", description="Display a welcome message for the AI service.")
def base_route():
    """
    Display a welcome message for the AI service.
    """
    return {"msg": "Welcome to ai service"}


@app.get(
    "/ai/openapi.json",
    include_in_schema=False,
    summary="Custom OpenAPI JSON",
    description="Return the custom OpenAPI JSON.",
)
def custom_swagger_ui_html():
    """
    Return the custom OpenAPI JSON.
    """
    return app.openapi()


@app.put("/db", summary="Update DB Mock", description="Update the database with mock data.")
def update_db_mock(db: Session = Depends(get_db)):
    """
    Update the database with mock data.

    - **db**: The database session.
    """
    update_db({}, db)


@app.websocket("/ws2")
async def websocket_endpoint(websocket: WebSocket, db: Session = Depends(get_db), redis_client=redis):
    """
    WebSocket endpoint for streaming data.

    - **websocket**: The WebSocket connection.
    - **db**: The database session.
    - **redis_client**: The Redis client.
    """
    await start_streaming(websocket=websocket, db=db, redis=redis)


@app.websocket("/ws1")
async def websocket_general_info(websocket: WebSocket):
    """
    WebSocket endpoint for general information.

    - **websocket**: The WebSocket connection.
    """
    await general_info(websocket)


@app.websocket("/ws3")
async def websocket_loan_officer(websocket: WebSocket, db: Session = Depends(get_db)):
    """
    WebSocket endpoint for loan officer information.

    - **websocket**: The WebSocket connection.
    - **db**: The database session.
    """
    await loan_officer(websocket, db)


@app.post("/doc-agent", summary="Document Agent Upload", description="Upload a document for the document agent.")
async def doc_agent(file: UploadFile, user_profile_id: int = Query(None)):
    """
    Upload a document for the document agent.

    - **file**: The document file.
    - **user_profile_id**: The ID of the user profile.
    """
    fs = await doc_upload(file)
    doc_dict = {"file_path": fs, "user_profile_id": user_profile_id}
    import json

    celery_app.send_task(DOC_VERIFY_QUEUE, args=[json.dumps(doc_dict)])
    return fs


@app.post(
    "/doc-agent-lo", summary="Document Agent Loan Officer Upload", description="Upload a document for the loan officer."
)
async def doc_agent_lo(file: UploadFile):
    """
    Upload a document for the loan officer.

    - **file**: The document file.
    """
    fs = await doc_upload_lo(file)
    return fs


@app.post("/quotation-analysis", summary="Quotation Analysis", description="Analyze a quotation document.")
async def quotation_analysis(file: UploadFile):
    """
    Analyze a quotation document.

    - **file**: The document file.
    """
    return await analyse_quote(file)


@app.get(
    "/pre-underwrite-details",
    summary="Pre-Underwrite Details",
    description="Fetch pre-underwrite details for a specified application.",
)
async def pre_underwrite_details(
    application_id: int,
    user_id: str,
    db: Session = Depends(get_db),
):
    """
    Fetch pre-underwrite details for a specified application.

    - **application_id**: The ID of the application.
    - **user_id**: The ID of the user.
    - **db**: The database session.
    """
    return underwrite(application_id, user_id, db)


@app.get(
    "/underwrite",
    summary="Underwrite Status and Details",
    description="Fetch the status and details of an underwrite application.",
    dependencies=[Depends(verify_token.verify), Depends(verify_token.is_loan_officer)],
)
async def underwrite_status_and_details(
    application_id: int, db: Session = Depends(get_db), user=Security(verify_token.verify, scopes=[])
):
    """
    Fetch the status and details of an underwrite application.

    - **application_id**: The ID of the application.
    - **db**: The database session.
    """
    user_id = get_user_id(application_id, db)
    data = underwrite(application_id, user_id, user, db)
    underwrite_remarks = get_underwriting_remarks(data)
    return underwrite_remarks


@app.post("/underwrite", summary="Create Underwrite", description="Create a new underwrite application.")
async def underwrite_create(application_id: int):
    """
    Create a new underwrite application.

    - **application_id**: The ID of the application.
    """
    return JSONResponse(status_code=202, content={"code": 202, "Status": "in Progress"})


@app.websocket("/ws1_secure")
async def secure_websocket_general_info(ws: WebSocket):
    try:
        # Step 1: Extract requested subprotocols
        requested_subprotocols = ws.headers.get("sec-websocket-protocol")

        # Step 2: Select the subprotocol you want to use (if multiple are requested)
        if requested_subprotocols:
            subprotocol = requested_subprotocols.split(",")[0].strip()
            token = requested_subprotocols.split(",")[1].strip()
        else:
            subprotocol = None
            token = None

        # Step 3: Verify token
        await verify_token.verify_websocket(ws, token)

        # Continue with general info logic
        await general_info(ws, None, subprotocol)

    except (UnauthenticatedException, UnauthorizedException):
        await ws.close(code=1008)


@app.websocket("/ws2_secure")
async def secure_websocket_endpoint(ws: WebSocket, db: Session = Depends(get_db), redis_client=redis):
    try:
        # Step 1: Extract requested subprotocols
        requested_subprotocols = ws.headers.get("sec-websocket-protocol")

        # TODO: subprotocol=token = None
        # if requested_subprotocols:
        #    subprotocol = requested_subprotocols.split(",")[0].strip()
        #    token = requested_subprotocols.split(",")[1].strip()

        # Step 2: Select the subprotocol you want to use (if multiple are requested)
        if requested_subprotocols:
            subprotocol = requested_subprotocols.split(",")[0].strip()
            token = requested_subprotocols.split(",")[1].strip()
        else:
            subprotocol = None
            # token = None  # This is made none but commented now because of precommit

        # Step 3: Verify token
        await verify_token.verify_websocket(ws, token)

        # Continue with streaming logic
        await start_streaming(websocket=ws, db=db, redis=redis_client, subprotocol=subprotocol)
    except (UnauthenticatedException, UnauthorizedException):
        await ws.close(code=1008)


@app.websocket("/ws3_secure")
async def secure_websocket_loan_officer(ws: WebSocket, db: Session = Depends(get_db)):
    try:
        # Step 1: Extract requested subprotocols
        requested_subprotocols = ws.headers.get("sec-websocket-protocol")

        # Step 2: Select the subprotocol you want to use (if multiple are requested)
        if requested_subprotocols:
            subprotocol = requested_subprotocols.split(",")[0].strip()
            token = requested_subprotocols.split(",")[1].strip()
        else:
            subprotocol = None
            token = None

        # Step 3: Verify token
        await verify_token.verify_websocket(ws, token)
        verify_token.is_loan_officer()

        # Continue with loan officer logic
        await loan_officer(websocket=ws, db=db, subprotocol=subprotocol)

    except (UnauthenticatedException, UnauthorizedException):
        await ws.close(code=1008)


@app.get(
    "/income-analytics",
    dependencies=[Depends(verify_token.verify), Depends(verify_token.is_loan_officer)],
    summary="Income Analytics",
    description="Fetch income analytics data for a specified user",
)
async def income_analytics(
    user_id: int = Query(None), db: Session = Depends(get_db), user=Security(verify_token.verify, scopes=[])
):
    """
    Fetch income analytics data for a specified user

    Parameters
    ----------
    - **user_id**: The ID of the user to fetch analytics for
    - **db**: The database session
    - **user**: The authenticated user making the request
    """
    try:
        # To do the income analysis of a particular user
        return customer_income_analytics(user_id, db)
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")


# initialize router
app.include_router(
    chat_router.router,
    prefix="/chat",
    tags=["Chat"],
)