from fastapi import FastAPI, Request, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from QuoteGenerator import QuoteGenerator
from typing import Union
from pydantic import BaseModel
import time
import os

# API to key to validate the Referer
API_KEY = os.getenv('API_KEY')
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Function to check of the incoming API call is from valid host or not
def api_key_auth(api_key:str = Depends(oauth2_scheme)):
    if api_key != API_KEY:
        raise HTTPException(
            status_code = status.HTTP_401_UNAUTHORIZED,
            detail="Forbidden Access"
        )

class QuoteRequest(BaseModel):
    tags: Union[None, str] = None
    do_sample: bool = False
    max_new_tokens: int = 16
    num_beams: int = 1
    top_k: int = 50
    top_p: float = 1.0
    temperature: float = 1.0

app = FastAPI()

#Middleware to note time
@app.middleware("http")
async def note_response_time(request: Request, call_next):
    start_time = time.time()
    response = await call_next(request)
    process_time = time.time()
    print(f'Time taken = {process_time-start_time:.1f}s')
    return response

quote_generator = QuoteGenerator()
quote_generator.load_generator()

@app.post("/", dependencies=[Depends(api_key_auth)])
def root(request: QuoteRequest):
    print("Incoming request\n", request.__dict__)
    return {"quote": "<bot>:A beautiful quote generated by bot"}

@app.post("/generate_quote", dependencies=[Depends(api_key_auth)])
def generate_quote(req: QuoteRequest):
    print("\nIncoming request \n", req.__dict__, end='\n\n')
    generated_quote_oup = quote_generator.generate_quote(
        tags = req.tags,
        max_new_tokens = req.max_new_tokens,
        num_beams = req.num_beams,
        temperature = req.temperature,
        top_k = req.top_k,
        top_p = req.top_p,
        do_sample = req.do_sample
    )
    return {'quote': generated_quote_oup}