from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from typing import Dict, Union, List
from models.text_classification import TextClassificationModel

router = APIRouter()
model = TextClassificationModel()

class TextInput(BaseModel):
    text: str

class BatchTextInput(BaseModel):
    texts: List[str]

class PredictionResponse(BaseModel):
    label: str
    confidence: float

class BatchPredictionResponse(BaseModel):
    predictions: List[PredictionResponse]

@router.post("/predict", response_model=PredictionResponse)
async def predict(input_data: TextInput) -> Dict[str, Union[str, float]]:
    """Make a prediction for a single text."""
    try:
        result = await model.predict(input_data.text)
        return result
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=f"Prediction failed: {str(e)}"
        )

@router.post("/predict_batch", response_model=BatchPredictionResponse)
async def predict_batch(input_data: BatchTextInput) -> Dict[str, List[Dict[str, Union[str, float]]]]:
    """Make predictions for multiple texts."""
    try:
        predictions = []
        for text in input_data.texts:
            result = await model.predict(text)
            predictions.append(result)
        return {"predictions": predictions}
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=f"Batch prediction failed: {str(e)}"
        )

@router.get("/info")
async def get_model_info():
    """Get information about the text classification model."""
    return model.get_info()