"""
Marine species detection inference endpoints.
"""

from fastapi import APIRouter, HTTPException, status, Depends
from typing import List

from app.models.inference import (
    InferenceRequest, 
    InferenceResponse, 
    SpeciesListResponse,
    SpeciesInfo,
    ErrorResponse
)
from app.services.inference_service import inference_service
from app.api.dependencies import validate_model_health
from app.core.logging import get_logger

logger = get_logger(__name__)

router = APIRouter()


@router.post(
    "/detect",
    response_model=InferenceResponse,
    responses={
        400: {"model": ErrorResponse, "description": "Bad Request"},
        503: {"model": ErrorResponse, "description": "Service Unavailable"},
    },
    summary="Detect Marine Species",
    description="Detect and identify marine species in an uploaded image using YOLOv5 model"
)
async def detect_marine_species(
    request: InferenceRequest,
    _: bool = Depends(validate_model_health)
) -> InferenceResponse:
    """
    Detect marine species in an image.
    
    - **image**: Base64 encoded image data
    - **confidence_threshold**: Minimum confidence for detections (0.0-1.0)
    - **iou_threshold**: IoU threshold for non-maximum suppression (0.0-1.0)
    - **image_size**: Input image size for inference (320-1280)
    - **return_annotated_image**: Whether to return annotated image with bounding boxes
    - **classes**: Optional list of class IDs to filter detections
    
    Returns detection results with bounding boxes, confidence scores, and species names.
    """
    try:
        logger.info("Processing marine species detection request")
        
        result = await inference_service.detect_species(
            image_data=request.image,
            confidence_threshold=request.confidence_threshold,
            iou_threshold=request.iou_threshold,
            image_size=request.image_size,
            return_annotated_image=request.return_annotated_image,
            classes=request.classes
        )
        
        logger.info(f"Detection completed: {len(result.detections)} species found")
        return result
        
    except ValueError as e:
        logger.error(f"Invalid input data: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Invalid input: {str(e)}"
        )
    except Exception as e:
        logger.error(f"Detection failed: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Detection failed: {str(e)}"
        )


@router.get(
    "/species",
    response_model=SpeciesListResponse,
    summary="List Supported Species",
    description="Get a list of all marine species that can be detected by the model"
)
async def list_supported_species(
    _: bool = Depends(validate_model_health)
) -> SpeciesListResponse:
    """
    Get a list of all supported marine species.
    
    Returns a comprehensive list of all marine species that the model can detect,
    including their class IDs and scientific/common names.
    """
    try:
        logger.info("Fetching supported species list")
        
        species_data = await inference_service.get_supported_species()
        
        species_list = [
            SpeciesInfo(class_id=item["class_id"], class_name=item["class_name"])
            for item in species_data
        ]
        
        return SpeciesListResponse(
            species=species_list,
            total_count=len(species_list)
        )
        
    except Exception as e:
        logger.error(f"Failed to fetch species list: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Failed to fetch species list: {str(e)}"
        )


@router.get(
    "/species/{class_id}",
    response_model=SpeciesInfo,
    responses={
        404: {"model": ErrorResponse, "description": "Species Not Found"},
    },
    summary="Get Species Information",
    description="Get information about a specific marine species by class ID"
)
async def get_species_info(
    class_id: int,
    _: bool = Depends(validate_model_health)
) -> SpeciesInfo:
    """
    Get information about a specific marine species.
    
    - **class_id**: The class ID of the species to look up
    
    Returns detailed information about the specified marine species.
    """
    try:
        logger.info(f"Fetching species info for class_id: {class_id}")
        
        species_data = await inference_service.get_supported_species()
        
        # Find the species with the given class_id
        for species in species_data:
            if species["class_id"] == class_id:
                return SpeciesInfo(
                    class_id=species["class_id"],
                    class_name=species["class_name"]
                )
        
        # Species not found
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Species with class_id {class_id} not found"
        )
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Failed to fetch species info: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Failed to fetch species info: {str(e)}"
        )