"""Generation specific endpoints"""

from fastapi import APIRouter, HTTPException
import pydantic
from datetime import datetime
import logging
from typing import Optional

from services import generate_model_manager

router = APIRouter()
logger = logging.getLogger(__name__)


class GenerateRequest(pydantic.BaseModel):
    input_text: str
    max_length: Optional[int] = 128
    num_beams: Optional[int] = 4


class GenerateResponse(pydantic.BaseModel):
    input_text: str
    generated_text: str
    timestamp: str


@router.post("/generate", response_model=GenerateResponse, tags=["Text Generation"])
async def generate_text(request: GenerateRequest):
    """
    Generate text using the T5 model
    
    - **input_text**: The input text for generation
    - **max_length**: Maximum length of generated text (default: 128)
    - **num_beams**: Number of beams for beam search (default: 4)
    
    Returns generated text
    """
    try:
        # Generate text
        result = generate_model_manager.generate(
            request.input_text, 
            max_length=request.max_length,
            num_beams=request.num_beams
        )
        
        # Build response
        response = GenerateResponse(
            input_text=request.input_text,
            generated_text=result,
            timestamp=datetime.now().isoformat()
        )
        
        logger.info(f"Generated text: {result}")
        return response
        
    except Exception as e:
        logger.error(f"Generation error: {str(e)}")
        raise HTTPException(status_code=500, detail=f"Generation failed: {str(e)}")