import joblib
import numpy as np
from fastapi import FastAPI
from src.api.schemas import PredictionRequest, PredictionResponse

app = FastAPI(
    title="BBC Document Classification API",
    version="1.0.0"
)

model = joblib.load("models/best_model.pkl")


@app.get("/")
def home():
    return {"message": "BBC Document Classification API is running"}


@app.get("/health")
def health():
    return {"status": "healthy"}


@app.post("/predict", response_model=PredictionResponse)
def predict(request: PredictionRequest):
    prediction = model.predict([request.text])[0]

    decision_scores = model.decision_function([request.text])
    confidence_score = float(np.max(decision_scores))

    return {
        "predicted_class": prediction,
        "confidence_score": round(confidence_score, 4)
    }