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from app.core.config import settings
from fastapi import FastAPI, HTTPException, Depends
from pydantic import BaseModel, EmailStr
from typing import Optional, Dict, Any, TypedDict, Annotated, Sequence
from langchain_core.messages import BaseMessage, HumanMessage
from langgraph.graph import add_messages
from langgraph.types import Command
import logging
from app.graph import graph
from app.state.state import EmailAgentState
from app.database.connection import get_session
from app.database.utils import get_or_create_user
from sqlalchemy.orm import Session
from app.database.connection import SessionLocal
from fastapi import Request
from app.database.models import User
from app.utils.email_encode import encode_email_for_namespace
from app.core.auth import create_access_token,get_current_user
import traceback
import gradio as gr
from app.gradio_ui import build_demo
# CREATE GMAIL AUTH FILES FROM HF SECRETS
logger = logging.getLogger(__name__)
def get_session():
db = SessionLocal()
try:
yield db
finally:
db.close()
app = FastAPI(title="AI Email Agent API")
# --- Schemas ---
class EmailProcessRequest(BaseModel):
thread_id: str
sender_email_id: EmailStr
sender_subject: str
sender_email_body: str
class ReviewActionRequest(BaseModel):
thread_id: str
status: str # "approved" or "rejected"
feedback: Optional[str] = None
class SendEmailRequest(BaseModel):
thread_id: str
human_message: str
# --- Helper Functions ---
def parse_interrupt(final_state: Dict[str, Any]) -> Optional[Dict[str, Any]]:
"""Parse interrupt from graph state."""
if "__interrupt__" not in final_state:
return None
interrupt_state = final_state.get("__interrupt__")
if not interrupt_state:
return None
interrupt = interrupt_state[0]
value = getattr(interrupt, "value", {}) or {}
return {
"action": value.get("action"),
"data": value.get("data", {})
}
# --- Endpoints ---
@app.post("/get-user-data")
def get_user_data(user_email: EmailStr, db: Session = Depends(get_session)):
"""Get user data by email."""
user = get_or_create_user(db, user_email)
token = create_access_token({
"id": user.id,
"email": user_email
})
return {"user_id": str(user.id), "email": user.email, "token": token}
@app.post("/process-email")
def process_email(request: EmailProcessRequest, db: Session = Depends(get_session), current_user: User = Depends(get_current_user)) -> Dict[str, Any]:
"""Process email through the graph pipeline."""
try:
thread_id = request.thread_id
config = {
"configurable": {
"thread_id": thread_id,
"user_id": str(current_user.id),
"sender_email_id": encode_email_for_namespace(request.sender_email_id ),
}
}
input_data = {
"user_email_id": current_user.email,
"user_id": current_user.id,
"user_name": "Atharva",
"sender_email_id": request.sender_email_id,
"sender_subject": request.sender_subject,
"sender_email_body": request.sender_email_body,
}
try:
final_state = graph.invoke(input_data, config=config)
except Exception as e:
logger.error(f"Error invoking graph: {str(e)}")
traceback.print_exc()
raise HTTPException(status_code=500, detail=f"Graph invocation error: {str(e)}")
if final_state.get('triage_label') == "FOLLOW_UP_REQUIRED":
if "__interrupt__" in final_state and not final_state.get("draft_id"):
parsed_interrupt = parse_interrupt(final_state)
if parsed_interrupt:
data = parsed_interrupt["data"]
return {
"status": "needs_review",
"thread_id": thread_id,
"messages": final_state.get("messages", []),
"triage_label": final_state.get("triage_label"),
"action": parsed_interrupt["action"],
"email_draft": {
"to": data.get("to"),
"subject": data.get("subject"),
"body": data.get("body"),
}
}
return {
"thread_id": thread_id,
"triage_label": final_state.get("triage_label"),
}
except Exception as e:
logger.error(f"Error processing email: {str(e)}")
traceback.print_exc()
raise HTTPException(status_code=500, detail=str(e))
@app.post("/review-action")
def review_action(request: ReviewActionRequest,db: Session = Depends(get_session), current_user: User = Depends(get_current_user)) -> Dict[str, Any]:
"""Resume graph execution based on user review."""
try:
config = {
"configurable": {
"thread_id": request.thread_id,
"user_id": str(current_user.id),
}
}
state=graph.get_state(config)
sender_email_id=state.values['sender_email_id']
config["configurable"]["sender_email_id"] = encode_email_for_namespace(sender_email_id)
if request.status == "rejected":
payload = Command(resume={
"status": "rejected",
"feedback": request.feedback
})
elif request.status == "approved":
payload = Command(resume={
"status": "approved"
})
else:
raise HTTPException(status_code=400, detail="Invalid status")
intermediate_state = graph.invoke(payload, config=config)
# Still in review phase
if "__interrupt__" in intermediate_state and not intermediate_state.get("draft_id"):
parsed_interrupt = parse_interrupt(intermediate_state)
if parsed_interrupt:
data = parsed_interrupt["data"]
return {
"status": "needs_review",
"thread_id": request.thread_id,
"triage_label": intermediate_state.get("triage_label"),
"action": parsed_interrupt["action"],
"email_draft": {
"to": data.get("to"),
"subject": data.get("subject"),
"body": data.get("body"),
}
}
# Draft created, review complete
if intermediate_state.get("draft_id"):
return {
"thread_id": request.thread_id,
"draft_id": intermediate_state["draft_id"],
"messages": intermediate_state.get("messages", []),
"reply_subject": intermediate_state.get("reply_subject"),
"reply_email_body": intermediate_state.get("reply_email_body"),
}
except Exception as e:
logger.error(f"Error in review action: {str(e)}")
traceback.print_exc()
raise HTTPException(status_code=500, detail=str(e))
@app.post("/send_email")
def send_email(request: SendEmailRequest,db: Session = Depends(get_session),current_user: User = Depends(get_current_user)) -> Dict[str, Any]:
config = {
"configurable": {
"thread_id": request.thread_id,
"user_id": str(current_user.id),
}
}
state=graph.get_state(config)
sender_email_id=state.values['sender_email_id']
config["configurable"]["sender_email_id"] = encode_email_for_namespace(sender_email_id)
graph.update_state(
config,
{"messages": [HumanMessage(content=request.human_message)]},
as_node="prepare_context_node"
)
final_state = graph.invoke(None, config=config)
return {
"thread_id": request.thread_id,
"messages": final_state.get("messages", []),
"sent_message_id": final_state.get("sent_message_id")
}
# adjust import path to wherever you place gradio_ui.py
demo = build_demo()
# Mounts the Gradio UI at /ui → e.g. https://vinit006-emailagentwithmemory.hf.space/ui
app = gr.mount_gradio_app(app, demo, path="/ui")
# used for local testing
# if __name__ == "__main__":
# import uvicorn
# uvicorn.run(app, host="127.0.0.1", port=8080) |