import fastdeploy as fd
import os.path as op


def build_option(device, backend, cache_file):
    """
       创建Runtime运行选项
       device：设备CPU or GPU
       backend:TensorRT引擎
    """
    option = fd.RuntimeOption()
    option.use_cpu()
    option.trt_option.serialize_file = cache_file
    if device.lower() == "gpu":
        option.use_gpu(0)
    if backend.lower() == "trt":
        assert device.lower(
        ) == "gpu", "TensorRT backend require inference on device GPU."
        option.use_trt_backend()
    return option


def Load_model(model_file, device, cache_file):
    """
    加载模型的tensorRT引擎
    model_file：模型权重   格式：".onnx"
    device：设备选择
    """

    model_name = op.basename(model_file).split('_')[0]

    # print(model_file)

    runtime_option = build_option(
        device=device, backend="trt", cache_file=cache_file)
    model_inference = []

    if model_name == "yolov5":
        model = fd.vision.detection.YOLOv5(
            model_file, runtime_option=runtime_option)
        model_inference = model

    elif model_name == "yolov8":
        model = fd.vision.detection.YOLOv8(
            model_file, runtime_option=runtime_option)
        model_inference = model


    # print(model_inference)
    return model_inference