"""Train RF-DETR model on car_data for aerial car detection."""

import argparse
from pathlib import Path

import rfdetr

MODEL_CLASSES: dict[str, type] = {
    "nano": rfdetr.RFDETRNano,
    "small": rfdetr.RFDETRSmall,
    "base": rfdetr.RFDETRBase,
    "medium": rfdetr.RFDETRMedium,
    "large": rfdetr.RFDETRLarge,
}


def run_training(
    dataset_dir: str | Path,
    epochs: int = 50,
    batch_size: int = 4,
    lr: float = 1e-4,
    resolution: int = 640,
    output_dir: str = "output",
    model_size: str = "base",
    grad_accum_steps: int = 1,
    num_classes: int = 1,
) -> None:
    """Run RF-DETR training.

    Args:
        dataset_dir: Path to dataset (YOLO or COCO format, auto-detected).
        epochs: Number of training epochs.
        batch_size: Batch size.
        lr: Learning rate.
        resolution: Input resolution.
        output_dir: Checkpoint output directory.
        model_size: Model variant (nano/small/base/medium/large).
        grad_accum_steps: Gradient accumulation steps.
        num_classes: Number of object classes.
    """
    model_cls = MODEL_CLASSES.get(model_size)
    if model_cls is None:
        raise ValueError(
            f"Unknown model_size {model_size!r}, "
            f"choose from: {', '.join(MODEL_CLASSES)}"
        )

    model = model_cls()
    model.train(
        dataset_dir=str(dataset_dir),
        epochs=epochs,
        batch_size=batch_size,
        lr=lr,
        resolution=resolution,
        output_dir=output_dir,
        num_classes=num_classes,
        grad_accum_steps=grad_accum_steps,
        run_test=False,
    )


def main() -> None:
    parser = argparse.ArgumentParser(description="Train RF-DETR on car_data")
    parser.add_argument("--epochs", type=int, default=50)
    parser.add_argument("--batch-size", type=int, default=4)
    parser.add_argument("--lr", type=float, default=1e-4)
    parser.add_argument("--resolution", type=int, default=640)
    parser.add_argument("--output-dir", type=str, default="output")
    args = parser.parse_args()

    training_dir = Path(__file__).resolve().parent
    dataset_dir = training_dir / "car_data" / "mydata" / "mydata"

    run_training(
        dataset_dir=dataset_dir,
        epochs=args.epochs,
        batch_size=args.batch_size,
        lr=args.lr,
        resolution=args.resolution,
        output_dir=args.output_dir,
    )


if __name__ == "__main__":
    main()