import csv
import datetime

from typing import Annotated

import uvicorn

from fastapi import FastAPI, Form
from pydantic import BaseModel

from .config import settings


app = FastAPI()


class Reading(BaseModel):
    temperature: float
    humidity: float
    age: int
    device: str


@app.post("/upload", response_model=Reading)
def add_reading(
    temp: Annotated[float, Form()],
    humidity: Annotated[float, Form()],
    age: Annotated[int, Form()],
    device: Annotated[str, Form()],
):
    current_datetime = datetime.datetime.now()
    deducted_datetime = current_datetime - datetime.timedelta(milliseconds=age)
    append_to_csv(settings.FILE_PATH, temp, humidity, deducted_datetime, device)
    return Reading(temperature=temp, humidity=humidity, age=age, device=device)


def append_to_csv(filename, temperature, humidity, datetime_var, device):
    with open(filename, "a", newline="") as csvfile:
        writer = csv.writer(csvfile)
        writer.writerow([temperature, humidity, datetime_var, device])


def init():
    uvicorn.run(app, host=settings.HOST, port=settings.PORT)